Annual report pursuant to Section 13 and 15(d)

Real Estate Investments And Accumulated Depreciation (Details)

v2.4.0.6
Real Estate Investments And Accumulated Depreciation (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
Real Estate and Accumulated Depreciation [Line Items]  
Related Encumbrances $ 739,448,000
Initial Costs, Land 761,081,000
Initial Costs, Building and Improvements 3,644,041,000
Costs Capitalized Subsequent to Acquisition 874,648,000
Gross Amount at Which Carried at Close of Period, Land 773,026,000 [1]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,506,744,000 [1]
Total 5,279,770,000 [1]
Accumulated Depreciation 1,409,163,000 [2]
Aggregate cost for federal income tax 3,200,000,000
Life used for depreciation, years 40
Bergen County [Member] | Fair Lawn [Member] | 17-17 Rte 208 North [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1995 [3]
Initial Costs, Land 3,067,000 [3]
Initial Costs, Building and Improvements 19,415,000 [3]
Costs Capitalized Subsequent to Acquisition 3,780,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,067,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 23,195,000 [1],[3]
Total 26,262,000 [1],[3]
Accumulated Depreciation 9,119,000 [2],[3]
Bergen County [Member] | Fort Lee [Member] | One Bridge Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 1996 [3]
Initial Costs, Land 2,439,000 [3]
Initial Costs, Building and Improvements 24,462,000 [3]
Costs Capitalized Subsequent to Acquisition 7,481,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,439,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 31,943,000 [1],[3]
Total 34,382,000 [1],[3]
Accumulated Depreciation 11,737,000 [2],[3]
Bergen County [Member] | Fort Lee [Member] | 2115 Linwood Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 1998 [3]
Initial Costs, Land 474,000 [3]
Initial Costs, Building and Improvements 4,419,000 [3]
Costs Capitalized Subsequent to Acquisition 4,473,000 [3]
Gross Amount at Which Carried at Close of Period, Land 474,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,892,000 [1],[3]
Total 9,366,000 [1],[3]
Accumulated Depreciation 2,629,000 [2],[3]
Bergen County [Member] | Little Ferry [Member] | 200 Riser Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1974 [3]
Year Acquired 1997 [3]
Initial Costs, Land 3,888,000 [3]
Initial Costs, Building and Improvements 15,551,000 [3]
Costs Capitalized Subsequent to Acquisition 413,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,888,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,964,000 [1],[3]
Total 19,852,000 [1],[3]
Accumulated Depreciation 5,670,000 [2],[3]
Bergen County [Member] | Lyndhurst [Member] | 210 Clay Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1978 [3]
Year Acquired 2009 [3]
Related Encumbrances 11,844,000 [3]
Initial Costs, Land 2,300,000 [3]
Initial Costs, Building and Improvements 11,189,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,300,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,189,000 [1],[3]
Total 13,489,000 [1],[3]
Accumulated Depreciation 1,302,000 [2],[3]
Bergen County [Member] | Montvale [Member] | 95 Chestnut Ridge Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1975 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,227,000 [3]
Initial Costs, Building and Improvements 4,907,000 [3]
Costs Capitalized Subsequent to Acquisition 209,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,227,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,116,000 [1],[3]
Total 6,343,000 [1],[3]
Accumulated Depreciation 1,811,000 [2],[3]
Bergen County [Member] | Montvale [Member] | 135 Chestnut Ridge Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,587,000 [3]
Initial Costs, Building and Improvements 10,350,000 [3]
Costs Capitalized Subsequent to Acquisition 1,314,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,588,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,663,000 [1],[3]
Total 14,251,000 [1],[3]
Accumulated Depreciation 4,051,000 [2],[3]
Bergen County [Member] | Paramus [Member] | 15 East Midland Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1997 [3]
Related Encumbrances 13,000,000 [3]
Initial Costs, Land 10,375,000 [3]
Initial Costs, Building and Improvements 41,497,000 [3]
Costs Capitalized Subsequent to Acquisition 663,000 [3]
Gross Amount at Which Carried at Close of Period, Land 10,374,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 42,161,000 [1],[3]
Total 52,535,000 [1],[3]
Accumulated Depreciation 14,690,000 [2],[3]
Bergen County [Member] | Paramus [Member] | 140 East Ridgewood Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 1997 [3]
Related Encumbrances 12,250,000 [3]
Initial Costs, Land 7,932,000 [3]
Initial Costs, Building and Improvements 31,463,000 [3]
Costs Capitalized Subsequent to Acquisition 6,078,000 [3]
Gross Amount at Which Carried at Close of Period, Land 7,932,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 37,541,000 [1],[3]
Total 45,473,000 [1],[3]
Accumulated Depreciation 13,091,000 [2],[3]
Bergen County [Member] | Paramus [Member] | 461 From Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1997 [3]
Initial Costs, Land 13,194,000 [3]
Initial Costs, Building and Improvements 52,778,000 [3]
Costs Capitalized Subsequent to Acquisition 619,000 [3]
Gross Amount at Which Carried at Close of Period, Land 13,194,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 53,397,000 [1],[3]
Total 66,591,000 [1],[3]
Accumulated Depreciation 18,683,000 [2],[3]
Bergen County [Member] | Paramus [Member] | 650 From Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1978 [3]
Year Acquired 1997 [3]
Related Encumbrances 23,500,000 [3]
Initial Costs, Land 10,487,000 [3]
Initial Costs, Building and Improvements 41,949,000 [3]
Costs Capitalized Subsequent to Acquisition 7,144,000 [3]
Gross Amount at Which Carried at Close of Period, Land 10,487,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 49,093,000 [1],[3]
Total 59,580,000 [1],[3]
Accumulated Depreciation 18,361,000 [2],[3]
Bergen County [Member] | Paramus [Member] | 61 South Paramus Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3],[4]
Year Acquired 1997 [3],[4]
Related Encumbrances 23,000,000 [3],[4]
Initial Costs, Land 9,005,000 [3],[4]
Initial Costs, Building and Improvements 36,018,000 [3],[4]
Costs Capitalized Subsequent to Acquisition 7,150,000 [3],[4]
Gross Amount at Which Carried at Close of Period, Land 9,005,000 [1],[3],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements 43,168,000 [1],[3],[4]
Total 52,173,000 [1],[3],[4]
Accumulated Depreciation 15,533,000 [2],[3],[4]
Bergen County [Member] | Rochelle Park [Member] | 120 West Passaic Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1972 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,354,000 [3]
Initial Costs, Building and Improvements 5,415,000 [3]
Costs Capitalized Subsequent to Acquisition 95,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,357,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,507,000 [1],[3]
Total 6,864,000 [1],[3]
Accumulated Depreciation 1,964,000 [2],[3]
Bergen County [Member] | Rochelle Park [Member] | 365 West Passaic Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1976 [3]
Year Acquired 1997 [3]
Related Encumbrances 12,250,000 [3]
Initial Costs, Land 4,148,000 [3]
Initial Costs, Building and Improvements 16,592,000 [3]
Costs Capitalized Subsequent to Acquisition 3,849,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,148,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 20,441,000 [1],[3]
Total 24,589,000 [1],[3]
Accumulated Depreciation 7,150,000 [2],[3]
Bergen County [Member] | Rochelle Park [Member] | 395 West Passaic Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1979 [3]
Year Acquired 2006 [3]
Related Encumbrances 10,781,000 [3]
Initial Costs, Land 2,550,000 [3]
Initial Costs, Building and Improvements 17,131,000 [3]
Costs Capitalized Subsequent to Acquisition 1,049,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,550,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 18,180,000 [1],[3]
Total 20,730,000 [1],[3]
Accumulated Depreciation 3,729,000 [2],[3]
Bergen County [Member] | Upper Saddle River [Member] | 1 Lake Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1994 [3]
Year Acquired 1997 [3]
Related Encumbrances 42,000,000 [3]
Initial Costs, Land 13,952,000 [3]
Initial Costs, Building and Improvements 55,812,000 [3]
Costs Capitalized Subsequent to Acquisition 1,409,000 [3]
Gross Amount at Which Carried at Close of Period, Land 13,953,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 57,220,000 [1],[3]
Total 71,173,000 [1],[3]
Accumulated Depreciation 19,701,000 [2],[3]
Bergen County [Member] | Upper Saddle River [Member] | 10 Mountainview Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 1998 [3]
Initial Costs, Land 4,240,000 [3]
Initial Costs, Building and Improvements 20,485,000 [3]
Costs Capitalized Subsequent to Acquisition 3,012,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,240,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 23,497,000 [1],[3]
Total 27,737,000 [1],[3]
Accumulated Depreciation 8,890,000 [2],[3]
Bergen County [Member] | Woodcliff Lake [Member] | 400 Chestnut Ridge Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 1997 [3]
Initial Costs, Land 4,201,000 [3]
Initial Costs, Building and Improvements 16,802,000 [3]
Costs Capitalized Subsequent to Acquisition 5,080,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,201,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,882,000 [1],[3]
Total 26,083,000 [1],[3]
Accumulated Depreciation 9,359,000 [2],[3]
Bergen County [Member] | Woodcliff Lake [Member] | 470 Chestnut Ridge Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,346,000 [3]
Initial Costs, Building and Improvements 9,385,000 [3]
Costs Capitalized Subsequent to Acquisition 1,517,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,346,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,902,000 [1],[3]
Total 13,248,000 [1],[3]
Accumulated Depreciation 3,954,000 [2],[3]
Bergen County [Member] | Woodcliff Lake [Member] | 530 Chestnut Ridge Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,860,000 [3]
Initial Costs, Building and Improvements 7,441,000 [3]
Costs Capitalized Subsequent to Acquisition 210,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,860,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,651,000 [1],[3]
Total 9,511,000 [1],[3]
Accumulated Depreciation 2,613,000 [2],[3]
Bergen County [Member] | Woodcliff Lake [Member] | 50 Tice Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1994 [3]
Related Encumbrances 24,000,000 [3]
Initial Costs, Land 4,500,000 [3]
Costs Capitalized Subsequent to Acquisition 25,376,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,500,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 25,376,000 [1],[3]
Total 29,876,000 [1],[3]
Accumulated Depreciation 15,874,000 [2],[3]
Bergen County [Member] | Woodcliff Lake [Member] | 300 Tice Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [3]
Year Acquired 1996 [3]
Initial Costs, Land 5,424,000 [3]
Initial Costs, Building and Improvements 29,688,000 [3]
Costs Capitalized Subsequent to Acquisition 5,039,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,424,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 34,727,000 [1],[3]
Total 40,151,000 [1],[3]
Accumulated Depreciation 12,695,000 [2],[3]
Burlington County [Member] | Burlington [Member] | 3 Terri Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [5]
Year Acquired 1998 [5]
Initial Costs, Land 652,000 [5]
Initial Costs, Building and Improvements 3,433,000 [5]
Costs Capitalized Subsequent to Acquisition 2,019,000 [5]
Gross Amount at Which Carried at Close of Period, Land 658,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,446,000 [1],[5]
Total 6,104,000 [1],[5]
Accumulated Depreciation 2,193,000 [2],[5]
Burlington County [Member] | Burlington [Member] | 5 Terri Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1992 [5]
Year Acquired 1998 [5]
Initial Costs, Land 564,000 [5]
Initial Costs, Building and Improvements 3,792,000 [5]
Costs Capitalized Subsequent to Acquisition 2,550,000 [5]
Gross Amount at Which Carried at Close of Period, Land 569,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,337,000 [1],[5]
Total 6,906,000 [1],[5]
Accumulated Depreciation 2,370,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 2 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [5]
Year Acquired 1999 [5]
Initial Costs, Land 723,000 [5]
Initial Costs, Building and Improvements 2,893,000 [5]
Costs Capitalized Subsequent to Acquisition 741,000 [5]
Gross Amount at Which Carried at Close of Period, Land 723,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,634,000 [1],[5]
Total 4,357,000 [1],[5]
Accumulated Depreciation 1,207,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 101 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [5]
Year Acquired 1998 [5]
Initial Costs, Land 422,000 [5]
Initial Costs, Building and Improvements 3,528,000 [5]
Costs Capitalized Subsequent to Acquisition 436,000 [5]
Gross Amount at Which Carried at Close of Period, Land 426,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,960,000 [1],[5]
Total 4,386,000 [1],[5]
Accumulated Depreciation 1,451,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 102 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [5]
Year Acquired 1999 [5]
Initial Costs, Land 389,000 [5]
Initial Costs, Building and Improvements 1,554,000 [5]
Costs Capitalized Subsequent to Acquisition 538,000 [5]
Gross Amount at Which Carried at Close of Period, Land 389,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,092,000 [1],[5]
Total 2,481,000 [1],[5]
Accumulated Depreciation 713,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 201 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [5]
Year Acquired 1998 [5]
Initial Costs, Land 254,000 [5]
Initial Costs, Building and Improvements 1,694,000 [5]
Costs Capitalized Subsequent to Acquisition 480,000 [5]
Gross Amount at Which Carried at Close of Period, Land 258,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,170,000 [1],[5]
Total 2,428,000 [1],[5]
Accumulated Depreciation 889,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 202 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [5]
Year Acquired 1999 [5]
Initial Costs, Land 490,000 [5]
Initial Costs, Building and Improvements 1,963,000 [5]
Costs Capitalized Subsequent to Acquisition 774,000 [5]
Gross Amount at Which Carried at Close of Period, Land 490,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,737,000 [1],[5]
Total 3,227,000 [1],[5]
Accumulated Depreciation 1,015,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 1 Executive Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [5]
Year Acquired 1998 [5]
Initial Costs, Land 226,000 [5]
Initial Costs, Building and Improvements 1,453,000 [5]
Costs Capitalized Subsequent to Acquisition 586,000 [5]
Gross Amount at Which Carried at Close of Period, Land 228,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,037,000 [1],[5]
Total 2,265,000 [1],[5]
Accumulated Depreciation 880,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 2 Executive Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [5]
Year Acquired 2000 [5]
Initial Costs, Land 801,000 [5]
Initial Costs, Building and Improvements 3,206,000 [5]
Costs Capitalized Subsequent to Acquisition 960,000 [5]
Gross Amount at Which Carried at Close of Period, Land 801,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,166,000 [1],[5]
Total 4,967,000 [1],[5]
Accumulated Depreciation 1,599,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 101 Executive Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1998 [5]
Initial Costs, Land 241,000 [5]
Initial Costs, Building and Improvements 2,262,000 [5]
Costs Capitalized Subsequent to Acquisition 713,000 [5]
Gross Amount at Which Carried at Close of Period, Land 244,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,972,000 [1],[5]
Total 3,216,000 [1],[5]
Accumulated Depreciation 1,218,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 102 Executive Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1998 [5]
Initial Costs, Land 353,000 [5]
Initial Costs, Building and Improvements 3,607,000 [5]
Costs Capitalized Subsequent to Acquisition 370,000 [5]
Gross Amount at Which Carried at Close of Period, Land 357,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,973,000 [1],[5]
Total 4,330,000 [1],[5]
Accumulated Depreciation 1,379,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 225 Executive Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1998 [5]
Initial Costs, Land 323,000 [5]
Initial Costs, Building and Improvements 2,477,000 [5]
Costs Capitalized Subsequent to Acquisition 485,000 [5]
Gross Amount at Which Carried at Close of Period, Land 326,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,959,000 [1],[5]
Total 3,285,000 [1],[5]
Accumulated Depreciation 1,148,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 97 Foster Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [5]
Year Acquired 1998 [5]
Initial Costs, Land 208,000 [5]
Initial Costs, Building and Improvements 1,382,000 [5]
Costs Capitalized Subsequent to Acquisition 429,000 [5]
Gross Amount at Which Carried at Close of Period, Land 211,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,808,000 [1],[5]
Total 2,019,000 [1],[5]
Accumulated Depreciation 668,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 1507 Lancer Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1995 [5]
Year Acquired 1998 [5]
Initial Costs, Land 119,000 [5]
Initial Costs, Building and Improvements 1,106,000 [5]
Costs Capitalized Subsequent to Acquisition 51,000 [5]
Gross Amount at Which Carried at Close of Period, Land 120,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,156,000 [1],[5]
Total 1,276,000 [1],[5]
Accumulated Depreciation 419,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 1245 North Church Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 2001 [5]
Initial Costs, Land 691,000 [5]
Initial Costs, Building and Improvements 2,810,000 [5]
Costs Capitalized Subsequent to Acquisition 135,000 [5]
Gross Amount at Which Carried at Close of Period, Land 691,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,945,000 [1],[5]
Total 3,636,000 [1],[5]
Accumulated Depreciation 826,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 1247 North Church Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 2001 [5]
Initial Costs, Land 805,000 [5]
Initial Costs, Building and Improvements 3,269,000 [5]
Costs Capitalized Subsequent to Acquisition 204,000 [5]
Gross Amount at Which Carried at Close of Period, Land 805,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,473,000 [1],[5]
Total 4,278,000 [1],[5]
Accumulated Depreciation 1,027,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 1256 North Church Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [5]
Year Acquired 1998 [5]
Initial Costs, Land 354,000 [5]
Initial Costs, Building and Improvements 3,098,000 [5]
Costs Capitalized Subsequent to Acquisition 517,000 [5]
Gross Amount at Which Carried at Close of Period, Land 357,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,612,000 [1],[5]
Total 3,969,000 [1],[5]
Accumulated Depreciation 1,321,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 840 North Lenola Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1995 [5]
Year Acquired 1998 [5]
Initial Costs, Land 329,000 [5]
Initial Costs, Building and Improvements 2,366,000 [5]
Costs Capitalized Subsequent to Acquisition 540,000 [5]
Gross Amount at Which Carried at Close of Period, Land 333,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,902,000 [1],[5]
Total 3,235,000 [1],[5]
Accumulated Depreciation 1,205,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 844 North Lenola Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1995 [5]
Year Acquired 1998 [5]
Initial Costs, Land 239,000 [5]
Initial Costs, Building and Improvements 1,714,000 [5]
Costs Capitalized Subsequent to Acquisition 346,000 [5]
Gross Amount at Which Carried at Close of Period, Land 241,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,058,000 [1],[5]
Total 2,299,000 [1],[5]
Accumulated Depreciation 881,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 915 North Lenola Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 2000 [5]
Initial Costs, Land 508,000 [5]
Initial Costs, Building and Improvements 2,034,000 [5]
Costs Capitalized Subsequent to Acquisition 267,000 [5]
Gross Amount at Which Carried at Close of Period, Land 508,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,301,000 [1],[5]
Total 2,809,000 [1],[5]
Accumulated Depreciation 715,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 224 Strawbridge Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1997 [3]
Initial Costs, Land 766,000 [3]
Initial Costs, Building and Improvements 4,335,000 [3]
Costs Capitalized Subsequent to Acquisition 3,209,000 [3]
Gross Amount at Which Carried at Close of Period, Land 767,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,543,000 [1],[3]
Total 8,310,000 [1],[3]
Accumulated Depreciation 2,910,000 [2],[3]
Burlington County [Member] | Moorestown [Member] | 228 Strawbridge Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1997 [3]
Initial Costs, Land 766,000 [3]
Initial Costs, Building and Improvements 4,334,000 [3]
Costs Capitalized Subsequent to Acquisition 3,945,000 [3]
Gross Amount at Which Carried at Close of Period, Land 767,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,278,000 [1],[3]
Total 9,045,000 [1],[3]
Accumulated Depreciation 2,714,000 [2],[3]
Burlington County [Member] | Moorestown [Member] | 232 Strawbridge Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 2004 [3]
Initial Costs, Land 1,521,000 [3]
Initial Costs, Building and Improvements 7,076,000 [3]
Costs Capitalized Subsequent to Acquisition 1,953,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,521,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,029,000 [1],[3]
Total 10,550,000 [1],[3]
Accumulated Depreciation 2,300,000 [2],[3]
Burlington County [Member] | Moorestown [Member] | 2 Twosome Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2000 [5]
Year Acquired 2001 [5]
Initial Costs, Land 701,000 [5]
Initial Costs, Building and Improvements 2,807,000 [5]
Costs Capitalized Subsequent to Acquisition 218,000 [5]
Gross Amount at Which Carried at Close of Period, Land 701,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,025,000 [1],[5]
Total 3,726,000 [1],[5]
Accumulated Depreciation 886,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 30 Twosome Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1997 [5]
Year Acquired 1998 [5]
Initial Costs, Land 234,000 [5]
Initial Costs, Building and Improvements 1,954,000 [5]
Costs Capitalized Subsequent to Acquisition 490,000 [5]
Gross Amount at Which Carried at Close of Period, Land 236,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,442,000 [1],[5]
Total 2,678,000 [1],[5]
Accumulated Depreciation 961,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 31 Twosome Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 2001 [5]
Initial Costs, Land 815,000 [5]
Initial Costs, Building and Improvements 3,276,000 [5]
Costs Capitalized Subsequent to Acquisition 186,000 [5]
Gross Amount at Which Carried at Close of Period, Land 815,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,462,000 [1],[5]
Total 4,277,000 [1],[5]
Accumulated Depreciation 981,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 40 Twosome Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1996 [5]
Year Acquired 1998 [5]
Initial Costs, Land 297,000 [5]
Initial Costs, Building and Improvements 2,393,000 [5]
Costs Capitalized Subsequent to Acquisition 313,000 [5]
Gross Amount at Which Carried at Close of Period, Land 301,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,702,000 [1],[5]
Total 3,003,000 [1],[5]
Accumulated Depreciation 1,111,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 41 Twosome Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 2001 [5]
Initial Costs, Land 605,000 [5]
Initial Costs, Building and Improvements 2,459,000 [5]
Costs Capitalized Subsequent to Acquisition 69,000 [5]
Gross Amount at Which Carried at Close of Period, Land 605,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,528,000 [1],[5]
Total 3,133,000 [1],[5]
Accumulated Depreciation 715,000 [2],[5]
Burlington County [Member] | Moorestown [Member] | 50 Twosome Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1997 [5]
Year Acquired 1998 [5]
Initial Costs, Land 301,000 [5]
Initial Costs, Building and Improvements 2,330,000 [5]
Costs Capitalized Subsequent to Acquisition 92,000 [5]
Gross Amount at Which Carried at Close of Period, Land 304,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,419,000 [1],[5]
Total 2,723,000 [1],[5]
Accumulated Depreciation 897,000 [2],[5]
Gloucester County [Member] | West Deptford [Member] | 1451 Metropolitan Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1996 [5]
Year Acquired 1998 [5]
Initial Costs, Land 203,000 [5]
Initial Costs, Building and Improvements 1,189,000 [5]
Costs Capitalized Subsequent to Acquisition 30,000 [5]
Gross Amount at Which Carried at Close of Period, Land 206,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,216,000 [1],[5]
Total 1,422,000 [1],[5]
Accumulated Depreciation 451,000 [2],[5]
Essex County [Member] | Millburn [Member] | 150 J.F. Kennedy Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980 [3]
Year Acquired 1997 [3]
Initial Costs, Land 12,606,000 [3]
Initial Costs, Building and Improvements 50,425,000 [3]
Costs Capitalized Subsequent to Acquisition 8,537,000 [3]
Gross Amount at Which Carried at Close of Period, Land 12,606,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 58,962,000 [1],[3]
Total 71,568,000 [1],[3]
Accumulated Depreciation 23,851,000 [2],[3]
Essex County [Member] | Roseland [Member] | 4 Becker Farm Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2009 [3]
Related Encumbrances 37,769,000 [3]
Initial Costs, Land 5,600,000 [3]
Initial Costs, Building and Improvements 38,285,000 [3]
Costs Capitalized Subsequent to Acquisition 1,286,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,600,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 39,571,000 [1],[3]
Total 45,171,000 [1],[3]
Accumulated Depreciation 3,724,000 [2],[3]
Essex County [Member] | Roseland [Member] | 5 Becker Farm Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 2009 [3]
Related Encumbrances 12,056,000 [3]
Initial Costs, Land 2,400,000 [3]
Initial Costs, Building and Improvements 11,885,000 [3]
Costs Capitalized Subsequent to Acquisition 76,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,400,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,961,000 [1],[3]
Total 14,361,000 [1],[3]
Accumulated Depreciation 1,300,000 [2],[3]
Essex County [Member] | Roseland [Member] | 6 Becker Farm Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2009 [3]
Related Encumbrances 13,590,000 [3]
Initial Costs, Land 2,600,000 [3]
Initial Costs, Building and Improvements 15,548,000 [3]
Costs Capitalized Subsequent to Acquisition 263,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,600,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,811,000 [1],[3]
Total 18,411,000 [1],[3]
Accumulated Depreciation 1,430,000 [2],[3]
Essex County [Member] | Roseland [Member] | 101 Eisenhower Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980 [3]
Year Acquired 1994 [3]
Initial Costs, Land 228,000 [3]
Costs Capitalized Subsequent to Acquisition 21,074,000 [3]
Gross Amount at Which Carried at Close of Period, Land 228,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,074,000 [1],[3]
Total 21,302,000 [1],[3]
Accumulated Depreciation 11,192,000 [2],[3]
Essex County [Member] | Roseland [Member] | 103 Eisenhower Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 1994 [3]
Costs Capitalized Subsequent to Acquisition 15,057,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,300,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 12,757,000 [1],[3]
Total 15,057,000 [1],[3]
Accumulated Depreciation 7,763,000 [2],[3]
Essex County [Member] | Roseland [Member] | 105 Eisenhower Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2001 [3]
Year Acquired 2001 [3]
Initial Costs, Land 4,430,000 [3]
Initial Costs, Building and Improvements 42,898,000 [3]
Costs Capitalized Subsequent to Acquisition 6,997,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,835,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 50,490,000 [1],[3]
Total 54,325,000 [1],[3]
Accumulated Depreciation 18,922,000 [2],[3]
Essex County [Member] | Roseland [Member] | 75 Livingston Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 2009 [3]
Related Encumbrances 10,401,000 [3]
Initial Costs, Land 1,900,000 [3]
Initial Costs, Building and Improvements 6,312,000 [3]
Costs Capitalized Subsequent to Acquisition 198,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,900,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,510,000 [1],[3]
Total 8,410,000 [1],[3]
Accumulated Depreciation 955,000 [2],[3]
Essex County [Member] | Roseland [Member] | 85 Livingston Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 2009 [3]
Related Encumbrances 14,561,000 [3]
Initial Costs, Land 2,500,000 [3]
Initial Costs, Building and Improvements 14,238,000 [3]
Costs Capitalized Subsequent to Acquisition 122,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,500,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 14,360,000 [1],[3]
Total 16,860,000 [1],[3]
Accumulated Depreciation 1,401,000 [2],[3]
Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 1 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 1996 [3]
Initial Costs, Land 3,923,000 [3]
Initial Costs, Building and Improvements 51,013,000 [3]
Costs Capitalized Subsequent to Acquisition 27,703,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,923,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 78,716,000 [1],[3]
Total 82,639,000 [1],[3]
Accumulated Depreciation 27,153,000 [2],[3]
Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 2 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1996 [3]
Initial Costs, Land 17,655,000 [3]
Initial Costs, Building and Improvements 101,546,000 [3]
Costs Capitalized Subsequent to Acquisition 19,433,000 [3]
Gross Amount at Which Carried at Close of Period, Land 15,071,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 123,563,000 [1],[3]
Total 138,634,000 [1],[3]
Accumulated Depreciation 47,505,000 [2],[3]
Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 3 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1996 [3]
Initial Costs, Land 17,655,000 [3]
Initial Costs, Building and Improvements 101,878,000 [3]
Costs Capitalized Subsequent to Acquisition 19,101,000 [3]
Gross Amount at Which Carried at Close of Period, Land 15,071,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 123,563,000 [1],[3]
Total 138,634,000 [1],[3]
Accumulated Depreciation 47,505,000 [2],[3]
Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 4 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2000 [3]
Year Acquired 2000 [3]
Initial Costs, Land 1,244,000 [3]
Initial Costs, Building and Improvements 56,144,000 [3]
Costs Capitalized Subsequent to Acquisition 11,196,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,244,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 67,340,000 [1],[3]
Total 68,584,000 [1],[3]
Accumulated Depreciation 21,686,000 [2],[3]
Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 5 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2002 [3]
Year Acquired 2002 [3]
Related Encumbrances 231,603,000 [3]
Initial Costs, Land 6,218,000 [3]
Initial Costs, Building and Improvements 170,682,000 [3]
Costs Capitalized Subsequent to Acquisition 52,641,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,705,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 223,836,000 [1],[3]
Total 229,541,000 [1],[3]
Accumulated Depreciation 61,293,000 [2],[3]
Hudson County [Member] | Jersey City [Member] | 101 Hudson Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1992 [3]
Year Acquired 2004 [3]
Initial Costs, Land 45,530,000 [3]
Initial Costs, Building and Improvements 271,376,000 [3]
Costs Capitalized Subsequent to Acquisition 6,440,000 [3]
Gross Amount at Which Carried at Close of Period, Land 45,530,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 277,816,000 [1],[3]
Total 323,346,000 [1],[3]
Accumulated Depreciation 57,486,000 [2],[3]
Mercer County [Member] | Hamilton Township [Member] | 3 AAA Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 2007 [3]
Initial Costs, Land 242,000 [3]
Initial Costs, Building and Improvements 3,218,000 [3]
Costs Capitalized Subsequent to Acquisition 1,144,000 [3]
Gross Amount at Which Carried at Close of Period, Land 242,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,362,000 [1],[3]
Total 4,604,000 [1],[3]
Accumulated Depreciation 764,000 [2],[3]
Mercer County [Member] | Hamilton Township [Member] | 100 Horizon Center Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [5]
Year Acquired 1995 [5]
Initial Costs, Land 205,000 [5]
Initial Costs, Building and Improvements 1,676,000 [5]
Costs Capitalized Subsequent to Acquisition 226,000 [5]
Gross Amount at Which Carried at Close of Period, Land 315,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,792,000 [1],[5]
Total 2,107,000 [1],[5]
Accumulated Depreciation 783,000 [2],[5]
Mercer County [Member] | Hamilton Township [Member] | 200 Horizon Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [5]
Year Acquired 1995 [5]
Initial Costs, Land 205,000 [5]
Initial Costs, Building and Improvements 3,027,000 [5]
Costs Capitalized Subsequent to Acquisition 527,000 [5]
Gross Amount at Which Carried at Close of Period, Land 348,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,411,000 [1],[5]
Total 3,759,000 [1],[5]
Accumulated Depreciation 1,477,000 [2],[5]
Mercer County [Member] | Hamilton Township [Member] | 300 Horizon Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [5]
Year Acquired 1995 [5]
Initial Costs, Land 379,000 [5]
Initial Costs, Building and Improvements 4,355,000 [5]
Costs Capitalized Subsequent to Acquisition 1,742,000 [5]
Gross Amount at Which Carried at Close of Period, Land 521,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,955,000 [1],[5]
Total 6,476,000 [1],[5]
Accumulated Depreciation 2,937,000 [2],[5]
Mercer County [Member] | Hamilton Township [Member] | 500 Horizon Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1995 [5]
Initial Costs, Land 379,000 [5]
Initial Costs, Building and Improvements 3,395,000 [5]
Costs Capitalized Subsequent to Acquisition 1,088,000 [5]
Gross Amount at Which Carried at Close of Period, Land 487,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,375,000 [1],[5]
Total 4,862,000 [1],[5]
Accumulated Depreciation 1,972,000 [2],[5]
Mercer County [Member] | Hamilton Township [Member] | 600 Horizon Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2002 [5]
Year Acquired 2002 [5]
Initial Costs, Building and Improvements 7,549,000 [5]
Costs Capitalized Subsequent to Acquisition 650,000 [5]
Gross Amount at Which Carried at Close of Period, Land 685,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,514,000 [1],[5]
Total 8,199,000 [1],[5]
Accumulated Depreciation 1,705,000 [2],[5]
Mercer County [Member] | Hamilton Township [Member] | 700 Horizon Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2007 [3]
Year Acquired 2007 [3]
Initial Costs, Land 490,000 [3]
Initial Costs, Building and Improvements 43,000 [3]
Costs Capitalized Subsequent to Acquisition 16,492,000 [3]
Gross Amount at Which Carried at Close of Period, Land 865,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 16,160,000 [1],[3]
Total 17,025,000 [1],[3]
Accumulated Depreciation 2,059,000 [2],[3]
Mercer County [Member] | Hamilton Township [Member] | 2 South Gold Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1974 [3]
Year Acquired 2007 [3]
Initial Costs, Land 476,000 [3]
Initial Costs, Building and Improvements 3,487,000 [3]
Costs Capitalized Subsequent to Acquisition 398,000 [3]
Gross Amount at Which Carried at Close of Period, Land 476,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,885,000 [1],[3]
Total 4,361,000 [1],[3]
Accumulated Depreciation 556,000 [2],[3]
Mercer County [Member] | Princeton[Member] | 103 Carnegie Center [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1996 [3]
Initial Costs, Land 2,566,000 [3]
Initial Costs, Building and Improvements 7,868,000 [3]
Costs Capitalized Subsequent to Acquisition 3,353,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,566,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,221,000 [1],[3]
Total 13,787,000 [1],[3]
Accumulated Depreciation 4,707,000 [2],[3]
Mercer County [Member] | Princeton[Member] | 2 Independence Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 2009 [3]
Initial Costs, Land 1,300,000 [3]
Initial Costs, Building and Improvements 7,246,000 [3]
Costs Capitalized Subsequent to Acquisition 125,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,300,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,371,000 [1],[3]
Total 8,671,000 [1],[3]
Accumulated Depreciation 748,000 [2],[3]
Mercer County [Member] | Princeton[Member] | 3 Independence Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,997,000 [3]
Initial Costs, Building and Improvements 11,391,000 [3]
Costs Capitalized Subsequent to Acquisition 3,786,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,997,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,177,000 [1],[3]
Total 17,174,000 [1],[3]
Accumulated Depreciation 5,991,000 [2],[3]
Mercer County [Member] | Princeton[Member] | 100 Overlook Center [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,378,000 [3]
Initial Costs, Building and Improvements 21,754,000 [3]
Costs Capitalized Subsequent to Acquisition 5,094,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,378,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 26,848,000 [1],[3]
Total 29,226,000 [1],[3]
Accumulated Depreciation 11,376,000 [2],[3]
Mercer County [Member] | Princeton[Member] | 5 Vaughn Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1995 [3]
Initial Costs, Land 657,000 [3]
Initial Costs, Building and Improvements 9,800,000 [3]
Costs Capitalized Subsequent to Acquisition 3,003,000 [3]
Gross Amount at Which Carried at Close of Period, Land 657,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 12,803,000 [1],[3]
Total 13,460,000 [1],[3]
Accumulated Depreciation 5,940,000 [2],[3]
Middlesex County [Member] | East Brunswick [Member] | 377 Summerhill Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 1997 [3]
Initial Costs, Land 649,000 [3]
Initial Costs, Building and Improvements 2,594,000 [3]
Costs Capitalized Subsequent to Acquisition 412,000 [3]
Gross Amount at Which Carried at Close of Period, Land 649,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,006,000 [1],[3]
Total 3,655,000 [1],[3]
Accumulated Depreciation 1,084,000 [2],[3]
Middlesex County [Member] | Edison [Member] | 343 Thornall Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [3]
Year Acquired 2006 [3]
Initial Costs, Land 6,027,000 [3]
Initial Costs, Building and Improvements 39,101,000 [3]
Costs Capitalized Subsequent to Acquisition 5,054,000 [3]
Gross Amount at Which Carried at Close of Period, Land 6,027,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 44,155,000 [1],[3]
Total 50,182,000 [1],[3]
Accumulated Depreciation 9,194,000 [2],[3]
Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road Building 3 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 2004 [3]
Initial Costs, Land 1,030,000 [3]
Initial Costs, Building and Improvements 7,269,000 [3]
Costs Capitalized Subsequent to Acquisition 346,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,034,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,611,000 [1],[3]
Total 8,645,000 [1],[3]
Accumulated Depreciation 1,451,000 [2],[3]
Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road Building 4 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 2004 [3]
Initial Costs, Land 1,433,000 [3]
Initial Costs, Building and Improvements 10,121,000 [3]
Costs Capitalized Subsequent to Acquisition 385,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,429,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,510,000 [1],[3]
Total 11,939,000 [1],[3]
Accumulated Depreciation 2,004,000 [2],[3]
Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road Building 5 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 2004 [3]
Initial Costs, Land 2,979,000 [3]
Initial Costs, Building and Improvements 21,035,000 [3]
Costs Capitalized Subsequent to Acquisition 10,672,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,979,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 31,707,000 [1],[3]
Total 34,686,000 [1],[3]
Accumulated Depreciation 8,574,000 [2],[3]
Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road Building 6 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 2004 [3]
Initial Costs, Land 448,000 [3]
Initial Costs, Building and Improvements 3,161,000 [3]
Costs Capitalized Subsequent to Acquisition 4,483,000 [3]
Gross Amount at Which Carried at Close of Period, Land 448,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,644,000 [1],[3]
Total 8,092,000 [1],[3]
Accumulated Depreciation 1,897,000 [2],[3]
Middlesex County [Member] | Plainsboro [Member] | 500 College Road East [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3],[4]
Year Acquired 1998 [3],[4]
Initial Costs, Land 614,000 [3],[4]
Initial Costs, Building and Improvements 20,626,000 [3],[4]
Costs Capitalized Subsequent to Acquisition 5,790,000 [3],[4]
Gross Amount at Which Carried at Close of Period, Land 614,000 [1],[3],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements 26,416,000 [1],[3],[4]
Total 27,030,000 [1],[3],[4]
Accumulated Depreciation 8,443,000 [2],[3],[4]
Middlesex County [Member] | Woodbridge [Member] | 581 Main Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [3]
Year Acquired 1997 [3]
Related Encumbrances 16,338,000 [3]
Initial Costs, Land 3,237,000 [3]
Initial Costs, Building and Improvements 12,949,000 [3]
Costs Capitalized Subsequent to Acquisition 24,780,000 [3]
Gross Amount at Which Carried at Close of Period, Land 8,115,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 32,851,000 [1],[3]
Total 40,966,000 [1],[3]
Accumulated Depreciation 11,960,000 [2],[3]
Monmouth County [Member] | Freehold [Member] | 2 Paragon Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 2005 [3]
Initial Costs, Land 999,000 [3]
Initial Costs, Building and Improvements 4,619,000 [3]
Costs Capitalized Subsequent to Acquisition 1,035,000 [3]
Gross Amount at Which Carried at Close of Period, Land 999,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,654,000 [1],[3]
Total 6,653,000 [1],[3]
Accumulated Depreciation 1,248,000 [2],[3]
Monmouth County [Member] | Freehold [Member] | 3 Paragon Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [3]
Year Acquired 2005 [3]
Initial Costs, Land 1,423,000 [3]
Initial Costs, Building and Improvements 6,041,000 [3]
Costs Capitalized Subsequent to Acquisition 2,168,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,423,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,209,000 [1],[3]
Total 9,632,000 [1],[3]
Accumulated Depreciation 1,938,000 [2],[3]
Monmouth County [Member] | Freehold [Member] | 4 Paragon Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2002 [3]
Year Acquired 2005 [3]
Initial Costs, Land 1,961,000 [3]
Initial Costs, Building and Improvements 8,827,000 [3]
Costs Capitalized Subsequent to Acquisition (469,000) [3]
Gross Amount at Which Carried at Close of Period, Land 1,961,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,358,000 [1],[3]
Total 10,319,000 [1],[3]
Accumulated Depreciation 1,546,000 [2],[3]
Monmouth County [Member] | Freehold [Member] | 100 Willowbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2005 [3]
Initial Costs, Land 1,264,000 [3]
Initial Costs, Building and Improvements 5,573,000 [3]
Costs Capitalized Subsequent to Acquisition 1,129,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,264,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,702,000 [1],[3]
Total 7,966,000 [1],[3]
Accumulated Depreciation 1,619,000 [2],[3]
Monmouth County [Member] | Holmdel [Member] | 23 Main Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 2005 [3]
Related Encumbrances 31,002,000 [3]
Initial Costs, Land 4,336,000 [3]
Initial Costs, Building and Improvements 19,544,000 [3]
Costs Capitalized Subsequent to Acquisition 8,903,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,336,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 28,447,000 [1],[3]
Total 32,783,000 [1],[3]
Accumulated Depreciation 7,737,000 [2],[3]
Monmouth County [Member] | Middletown [Member] | One River Center Building 1 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2004 [3]
Related Encumbrances 11,290,000 [3]
Initial Costs, Land 3,070,000 [3]
Initial Costs, Building and Improvements 17,414,000 [3]
Costs Capitalized Subsequent to Acquisition 2,896,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,451,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 20,929,000 [1],[3]
Total 23,380,000 [1],[3]
Accumulated Depreciation 5,589,000 [2],[3]
Monmouth County [Member] | Middletown [Member] | One River Center Building 2 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2004 [3]
Related Encumbrances 12,664,000 [3]
Initial Costs, Land 2,468,000 [3]
Initial Costs, Building and Improvements 15,043,000 [3]
Costs Capitalized Subsequent to Acquisition 1,729,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,452,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 16,788,000 [1],[3]
Total 19,240,000 [1],[3]
Accumulated Depreciation 3,302,000 [2],[3]
Monmouth County [Member] | Middletown [Member] | One River Center Building 3 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 2004 [3]
Related Encumbrances 20,125,000 [3]
Initial Costs, Land 4,051,000 [3]
Initial Costs, Building and Improvements 24,790,000 [3]
Costs Capitalized Subsequent to Acquisition 5,526,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,627,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 29,740,000 [1],[3]
Total 34,367,000 [1],[3]
Accumulated Depreciation 5,625,000 [2],[3]
Monmouth County [Member] | Neptune [Member] | 3600 Route 66 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 1995 [3]
Initial Costs, Land 1,098,000 [3]
Initial Costs, Building and Improvements 18,146,000 [3]
Costs Capitalized Subsequent to Acquisition 1,483,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,098,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 19,629,000 [1],[3]
Total 20,727,000 [1],[3]
Accumulated Depreciation 7,813,000 [2],[3]
Monmouth County [Member] | Wall Township [Member] | 1305 Campus Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1995 [3]
Initial Costs, Land 335,000 [3]
Initial Costs, Building and Improvements 2,560,000 [3]
Costs Capitalized Subsequent to Acquisition 619,000 [3]
Gross Amount at Which Carried at Close of Period, Land 291,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,223,000 [1],[3]
Total 3,514,000 [1],[3]
Accumulated Depreciation 1,520,000 [2],[3]
Monmouth County [Member] | Wall Township [Member] | 1325 Campus Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [5]
Year Acquired 1995 [5]
Initial Costs, Land 270,000 [5]
Initial Costs, Building and Improvements 2,928,000 [5]
Costs Capitalized Subsequent to Acquisition 1,058,000 [5]
Gross Amount at Which Carried at Close of Period, Land 270,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,986,000 [1],[5]
Total 4,256,000 [1],[5]
Accumulated Depreciation 1,887,000 [2],[5]
Monmouth County [Member] | Wall Township [Member] | 1340 Campus Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1992 [5]
Year Acquired 1995 [5]
Initial Costs, Land 489,000 [5]
Initial Costs, Building and Improvements 4,621,000 [5]
Costs Capitalized Subsequent to Acquisition 1,876,000 [5]
Gross Amount at Which Carried at Close of Period, Land 489,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,497,000 [1],[5]
Total 6,986,000 [1],[5]
Accumulated Depreciation 2,823,000 [2],[5]
Monmouth County [Member] | Wall Township [Member] | 1345 Campus Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1995 [5]
Year Acquired 1997 [5]
Initial Costs, Land 1,023,000 [5]
Initial Costs, Building and Improvements 5,703,000 [5]
Costs Capitalized Subsequent to Acquisition 1,748,000 [5]
Gross Amount at Which Carried at Close of Period, Land 1,024,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,450,000 [1],[5]
Total 8,474,000 [1],[5]
Accumulated Depreciation 3,110,000 [2],[5]
Monmouth County [Member] | Wall Township [Member] | 1350 Campus Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1995 [3]
Initial Costs, Land 454,000 [3]
Initial Costs, Building and Improvements 7,134,000 [3]
Costs Capitalized Subsequent to Acquisition 1,382,000 [3]
Gross Amount at Which Carried at Close of Period, Land 454,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,516,000 [1],[3]
Total 8,970,000 [1],[3]
Accumulated Depreciation 3,784,000 [2],[3]
Monmouth County [Member] | Wall Township [Member] | 1433 Highway 34 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [5]
Year Acquired 1995 [5]
Initial Costs, Land 889,000 [5]
Initial Costs, Building and Improvements 4,321,000 [5]
Costs Capitalized Subsequent to Acquisition 1,402,000 [5]
Gross Amount at Which Carried at Close of Period, Land 889,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,723,000 [1],[5]
Total 6,612,000 [1],[5]
Accumulated Depreciation 2,546,000 [2],[5]
Monmouth County [Member] | Wall Township [Member] | 1320 Wyckoff Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [5]
Year Acquired 1995 [5]
Initial Costs, Land 255,000 [5]
Initial Costs, Building and Improvements 1,285,000 [5]
Costs Capitalized Subsequent to Acquisition 259,000 [5]
Gross Amount at Which Carried at Close of Period, Land 216,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,583,000 [1],[5]
Total 1,799,000 [1],[5]
Accumulated Depreciation 612,000 [2],[5]
Monmouth County [Member] | Wall Township [Member] | 1324 Wyckoff Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [5]
Year Acquired 1995 [5]
Initial Costs, Land 230,000 [5]
Initial Costs, Building and Improvements 1,439,000 [5]
Costs Capitalized Subsequent to Acquisition 340,000 [5]
Gross Amount at Which Carried at Close of Period, Land 190,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,819,000 [1],[5]
Total 2,009,000 [1],[5]
Accumulated Depreciation 824,000 [2],[5]
Morris County [Member] | Florham Park [Member] | 325 Columbia Parkway [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1994 [3]
Initial Costs, Land 1,564,000 [3]
Costs Capitalized Subsequent to Acquisition 16,117,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,564,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 16,117,000 [1],[3]
Total 17,681,000 [1],[3]
Accumulated Depreciation 8,858,000 [2],[3]
Morris County [Member] | Morris Plains [Member] | 250 Johnson Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,004,000 [3]
Initial Costs, Building and Improvements 8,016,000 [3]
Costs Capitalized Subsequent to Acquisition 1,854,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,004,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,870,000 [1],[3]
Total 11,874,000 [1],[3]
Accumulated Depreciation 3,754,000 [2],[3]
Morris County [Member] | Morris Plains [Member] | 201 Littleton Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1979 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,407,000 [3]
Initial Costs, Building and Improvements 9,627,000 [3]
Costs Capitalized Subsequent to Acquisition 1,382,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,407,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,009,000 [1],[3]
Total 13,416,000 [1],[3]
Accumulated Depreciation 3,712,000 [2],[3]
Morris County [Member] | Morris Township [Member] | 412 Mt. Kemble Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 2004 [3]
Initial Costs, Land 4,360,000 [3]
Initial Costs, Building and Improvements 33,167,000 [3]
Costs Capitalized Subsequent to Acquisition 13,894,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,360,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 47,061,000 [1],[3]
Total 51,421,000 [1],[3]
Accumulated Depreciation 11,134,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 4 Campus Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2001 [3]
Initial Costs, Land 5,213,000 [3]
Initial Costs, Building and Improvements 20,984,000 [3]
Costs Capitalized Subsequent to Acquisition 3,279,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,213,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 24,263,000 [1],[3]
Total 29,476,000 [1],[3]
Accumulated Depreciation 7,662,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 6 Campus Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2001 [3]
Initial Costs, Land 4,411,000 [3]
Initial Costs, Building and Improvements 17,796,000 [3]
Costs Capitalized Subsequent to Acquisition 3,565,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,411,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,361,000 [1],[3]
Total 25,772,000 [1],[3]
Accumulated Depreciation 6,695,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 7 Campus Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 1998 [3]
Initial Costs, Land 1,932,000 [3]
Initial Costs, Building and Improvements 27,788,000 [3]
Costs Capitalized Subsequent to Acquisition 5,925,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,932,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 33,713,000 [1],[3]
Total 35,645,000 [1],[3]
Accumulated Depreciation 11,122,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 8 Campus Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1998 [3]
Initial Costs, Land 1,865,000 [3]
Initial Costs, Building and Improvements 35,456,000 [3]
Costs Capitalized Subsequent to Acquisition 4,022,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,865,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 39,478,000 [1],[3]
Total 41,343,000 [1],[3]
Accumulated Depreciation 15,217,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 9 Campus Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2001 [3]
Initial Costs, Land 3,277,000 [3]
Initial Costs, Building and Improvements 11,796,000 [3]
Costs Capitalized Subsequent to Acquisition 17,132,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,842,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 26,363,000 [1],[3]
Total 32,205,000 [1],[3]
Accumulated Depreciation 8,815,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 4 Century Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 2004 [3]
Initial Costs, Land 1,787,000 [3]
Initial Costs, Building and Improvements 9,575,000 [3]
Costs Capitalized Subsequent to Acquisition 2,155,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,787,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,730,000 [1],[3]
Total 13,517,000 [1],[3]
Accumulated Depreciation 2,715,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 5 Century Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 2004 [3]
Initial Costs, Land 1,762,000 [3]
Initial Costs, Building and Improvements 9,341,000 [3]
Costs Capitalized Subsequent to Acquisition 2,263,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,762,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,604,000 [1],[3]
Total 13,366,000 [1],[3]
Accumulated Depreciation 2,316,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 6 Century Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 2004 [3]
Initial Costs, Land 1,289,000 [3]
Initial Costs, Building and Improvements 6,848,000 [3]
Costs Capitalized Subsequent to Acquisition 3,423,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,289,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,271,000 [1],[3]
Total 11,560,000 [1],[3]
Accumulated Depreciation 3,504,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 2 Dryden Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1998 [3]
Initial Costs, Land 778,000 [3]
Initial Costs, Building and Improvements 420,000 [3]
Costs Capitalized Subsequent to Acquisition 110,000 [3]
Gross Amount at Which Carried at Close of Period, Land 778,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 530,000 [1],[3]
Total 1,308,000 [1],[3]
Accumulated Depreciation 190,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 4 Gatehall Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2000 [3]
Initial Costs, Land 8,452,000 [3]
Initial Costs, Building and Improvements 33,929,000 [3]
Costs Capitalized Subsequent to Acquisition 4,163,000 [3]
Gross Amount at Which Carried at Close of Period, Land 8,452,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 38,092,000 [1],[3]
Total 46,544,000 [1],[3]
Accumulated Depreciation 12,051,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 2 Hilton Court [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [3]
Year Acquired 1998 [3]
Initial Costs, Land 1,971,000 [3]
Initial Costs, Building and Improvements 32,007,000 [3]
Costs Capitalized Subsequent to Acquisition 5,657,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,971,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 37,664,000 [1],[3]
Total 39,635,000 [1],[3]
Accumulated Depreciation 13,330,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 1633 Littleton Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1978 [3]
Year Acquired 2002 [3]
Initial Costs, Land 2,283,000 [3]
Initial Costs, Building and Improvements 9,550,000 [3]
Costs Capitalized Subsequent to Acquisition 163,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,355,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,641,000 [1],[3]
Total 11,996,000 [1],[3]
Accumulated Depreciation 3,225,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 600 Parsippany Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1978 [3]
Year Acquired 1994 [3]
Initial Costs, Land 1,257,000 [3]
Initial Costs, Building and Improvements 5,594,000 [3]
Costs Capitalized Subsequent to Acquisition 2,695,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,257,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,289,000 [1],[3]
Total 9,546,000 [1],[3]
Accumulated Depreciation 3,667,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 1 Sylvan Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 1998 [3]
Initial Costs, Land 1,689,000 [3]
Initial Costs, Building and Improvements 24,699,000 [3]
Costs Capitalized Subsequent to Acquisition 2,352,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,021,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 27,719,000 [1],[3]
Total 28,740,000 [1],[3]
Accumulated Depreciation 8,933,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 4 Sylvan Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 2009 [3]
Related Encumbrances 14,438,000 [3]
Initial Costs, Land 2,400,000 [3]
Initial Costs, Building and Improvements 13,486,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,400,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 13,486,000 [1],[3]
Total 15,886,000 [1],[3]
Accumulated Depreciation 1,358,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 5 Sylvan Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 1998 [3]
Initial Costs, Land 1,160,000 [3]
Initial Costs, Building and Improvements 25,214,000 [3]
Costs Capitalized Subsequent to Acquisition 2,740,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,161,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 27,953,000 [1],[3]
Total 29,114,000 [1],[3]
Accumulated Depreciation 10,311,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 7 Sylvan Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1998 [3]
Initial Costs, Land 2,084,000 [3]
Initial Costs, Building and Improvements 26,083,000 [3]
Costs Capitalized Subsequent to Acquisition 2,091,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,084,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 28,174,000 [1],[3]
Total 30,258,000 [1],[3]
Accumulated Depreciation 11,161,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 22 Sylvan Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2009 [3]
Year Acquired 2009 [3]
Initial Costs, Land 14,600,000 [3]
Initial Costs, Building and Improvements 44,392,000 [3]
Costs Capitalized Subsequent to Acquisition 78,000 [3]
Gross Amount at Which Carried at Close of Period, Land 14,600,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 44,470,000 [1],[3]
Total 59,070,000 [1],[3]
Accumulated Depreciation 4,457,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 20 Waterview Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2009 [3]
Related Encumbrances 23,575,000 [3]
Initial Costs, Land 4,500,000 [3]
Initial Costs, Building and Improvements 27,246,000 [3]
Costs Capitalized Subsequent to Acquisition 63,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,500,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 27,309,000 [1],[3]
Total 31,809,000 [1],[3]
Accumulated Depreciation 2,411,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 35 Waterview Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 2006 [3]
Related Encumbrances 19,051,000 [3]
Initial Costs, Land 5,133,000 [3]
Initial Costs, Building and Improvements 28,059,000 [3]
Costs Capitalized Subsequent to Acquisition 1,137,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,133,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 29,196,000 [1],[3]
Total 34,329,000 [1],[3]
Accumulated Depreciation 5,341,000 [2],[3]
Morris County [Member] | Parsippany [Member] | 5 Wood Hollow Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1979 [3]
Year Acquired 2004 [3]
Initial Costs, Land 5,302,000 [3]
Initial Costs, Building and Improvements 26,488,000 [3]
Costs Capitalized Subsequent to Acquisition 15,089,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,302,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 41,577,000 [1],[3]
Total 46,879,000 [1],[3]
Accumulated Depreciation 10,040,000 [2],[3]
Passaic County [Member] | Clifton [Member] | 777 Passaic Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 1994 [3]
Costs Capitalized Subsequent to Acquisition 7,026,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,100,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,926,000 [1],[3]
Total 7,026,000 [1],[3]
Accumulated Depreciation 3,523,000 [2],[3]
Passaic County [Member] | Totowa [Member] | 1 Center Court [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1999 [5]
Year Acquired 1999 [5]
Initial Costs, Land 270,000 [5]
Initial Costs, Building and Improvements 1,824,000 [5]
Costs Capitalized Subsequent to Acquisition 490,000 [5]
Gross Amount at Which Carried at Close of Period, Land 270,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,314,000 [1],[5]
Total 2,584,000 [1],[5]
Accumulated Depreciation 620,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 2 Center Court [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 1998 [5]
Initial Costs, Land 191,000 [5]
Costs Capitalized Subsequent to Acquisition 2,255,000 [5]
Gross Amount at Which Carried at Close of Period, Land 191,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,255,000 [1],[5]
Total 2,446,000 [1],[5]
Accumulated Depreciation 835,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 11 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [5]
Year Acquired 1995 [5]
Initial Costs, Land 586,000 [5]
Initial Costs, Building and Improvements 2,986,000 [5]
Costs Capitalized Subsequent to Acquisition 541,000 [5]
Gross Amount at Which Carried at Close of Period, Land 586,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,527,000 [1],[5]
Total 4,113,000 [1],[5]
Accumulated Depreciation 1,324,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 20 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1992 [5]
Year Acquired 1995 [5]
Initial Costs, Land 516,000 [5]
Initial Costs, Building and Improvements 3,108,000 [5]
Costs Capitalized Subsequent to Acquisition 26,000 [5]
Gross Amount at Which Carried at Close of Period, Land 516,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,134,000 [1],[5]
Total 3,650,000 [1],[5]
Accumulated Depreciation 1,267,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 29 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1995 [5]
Initial Costs, Land 586,000 [5]
Initial Costs, Building and Improvements 3,092,000 [5]
Costs Capitalized Subsequent to Acquisition 908,000 [5]
Gross Amount at Which Carried at Close of Period, Land 586,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,000,000 [1],[5]
Total 4,586,000 [1],[5]
Accumulated Depreciation 1,791,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 40 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [5]
Year Acquired 1995 [5]
Initial Costs, Land 516,000 [5]
Initial Costs, Building and Improvements 3,260,000 [5]
Costs Capitalized Subsequent to Acquisition 1,217,000 [5]
Gross Amount at Which Carried at Close of Period, Land 516,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,477,000 [1],[5]
Total 4,993,000 [1],[5]
Accumulated Depreciation 1,460,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 45 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1992 [5]
Year Acquired 1995 [5]
Initial Costs, Land 536,000 [5]
Initial Costs, Building and Improvements 3,379,000 [5]
Costs Capitalized Subsequent to Acquisition 468,000 [5]
Gross Amount at Which Carried at Close of Period, Land 536,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,847,000 [1],[5]
Total 4,383,000 [1],[5]
Accumulated Depreciation 1,539,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 60 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [5]
Year Acquired 1995 [5]
Initial Costs, Land 526,000 [5]
Initial Costs, Building and Improvements 3,257,000 [5]
Costs Capitalized Subsequent to Acquisition 628,000 [5]
Gross Amount at Which Carried at Close of Period, Land 526,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,885,000 [1],[5]
Total 4,411,000 [1],[5]
Accumulated Depreciation 1,679,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 80 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1996 [5]
Year Acquired 1996 [5]
Initial Costs, Land 227,000 [5]
Costs Capitalized Subsequent to Acquisition 1,270,000 [5]
Gross Amount at Which Carried at Close of Period, Land 227,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,270,000 [1],[5]
Total 1,497,000 [1],[5]
Accumulated Depreciation 463,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 100 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1996 [5]
Year Acquired 1996 [5]
Initial Costs, Land 226,000 [5]
Costs Capitalized Subsequent to Acquisition 1,270,000 [5]
Gross Amount at Which Carried at Close of Period, Land 226,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,270,000 [1],[5]
Total 1,496,000 [1],[5]
Accumulated Depreciation 462,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 120 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1994 [5]
Year Acquired 1995 [5]
Initial Costs, Land 228,000 [5]
Costs Capitalized Subsequent to Acquisition 1,328,000 [5]
Gross Amount at Which Carried at Close of Period, Land 229,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,327,000 [1],[5]
Total 1,556,000 [1],[5]
Accumulated Depreciation 536,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 140 Commerce Way [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1994 [5]
Year Acquired 1995 [5]
Initial Costs, Land 229,000 [5]
Costs Capitalized Subsequent to Acquisition 1,326,000 [5]
Gross Amount at Which Carried at Close of Period, Land 228,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,327,000 [1],[5]
Total 1,555,000 [1],[5]
Accumulated Depreciation 536,000 [2],[5]
Passaic County [Member] | Totowa [Member] | 999 Riverview Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1995 [3]
Initial Costs, Land 476,000 [3]
Initial Costs, Building and Improvements 6,024,000 [3]
Costs Capitalized Subsequent to Acquisition 2,419,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,102,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,817,000 [1],[3]
Total 8,919,000 [1],[3]
Accumulated Depreciation 3,397,000 [2],[3]
Somerset County [Member] | Basking Ridge [Member] | 222 Mt. Airy Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 1996 [3]
Initial Costs, Land 775,000 [3]
Initial Costs, Building and Improvements 3,636,000 [3]
Costs Capitalized Subsequent to Acquisition 2,958,000 [3]
Gross Amount at Which Carried at Close of Period, Land 775,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,594,000 [1],[3]
Total 7,369,000 [1],[3]
Accumulated Depreciation 2,756,000 [2],[3]
Somerset County [Member] | Basking Ridge [Member] | 233 Mt. Airy Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1996 [3]
Initial Costs, Land 1,034,000 [3]
Initial Costs, Building and Improvements 5,033,000 [3]
Costs Capitalized Subsequent to Acquisition 1,650,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,034,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,683,000 [1],[3]
Total 7,717,000 [1],[3]
Accumulated Depreciation 3,422,000 [2],[3]
Somerset County [Member] | Bernards [Member] | 106 Allen Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2000 [3]
Year Acquired 2000 [3]
Initial Costs, Land 3,853,000 [3]
Initial Costs, Building and Improvements 14,465,000 [3]
Costs Capitalized Subsequent to Acquisition 3,128,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,093,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 17,353,000 [1],[3]
Total 21,446,000 [1],[3]
Accumulated Depreciation 7,632,000 [2],[3]
Somerset County [Member] | Branchburg [Member] | 51 Imclone Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1978 [3]
Year Acquired 2009 [3]
Related Encumbrances 3,886,000 [3]
Initial Costs, Land 1,900,000 [3]
Initial Costs, Building and Improvements 3,475,000 [3]
Costs Capitalized Subsequent to Acquisition (1,000) [3]
Gross Amount at Which Carried at Close of Period, Land 1,900,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,474,000 [1],[3]
Total 5,374,000 [1],[3]
Accumulated Depreciation 310,000 [2],[3]
Somerset County [Member] | Bridgewater [Member] | 55 Corporate Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2011 [3]
Year Acquired 2011 [3]
Initial Costs, Land 13,338,000 [3]
Initial Costs, Building and Improvements 26,637,000 [3]
Costs Capitalized Subsequent to Acquisition 6,407,000 [3]
Gross Amount at Which Carried at Close of Period, Land 13,338,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 33,044,000 [1],[3]
Total 46,382,000 [1],[3]
Accumulated Depreciation 643,000 [2],[3]
Somerset County [Member] | Bridgewater [Member] | 440 Route 22 East [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 2010 [3]
Related Encumbrances 11,000,000 [3]
Initial Costs, Land 3,986,000 [3]
Initial Costs, Building and Improvements 13,658,000 [3]
Costs Capitalized Subsequent to Acquisition 3,882,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,986,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 17,540,000 [1],[3]
Total 21,526,000 [1],[3]
Accumulated Depreciation 832,000 [2],[3]
Somerset County [Member] | Bridgewater [Member] | 721 Route 202/206 [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 1997 [3]
Initial Costs, Land 6,730,000 [3]
Initial Costs, Building and Improvements 26,919,000 [3]
Costs Capitalized Subsequent to Acquisition 8,945,000 [3]
Gross Amount at Which Carried at Close of Period, Land 6,730,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 35,864,000 [1],[3]
Total 42,594,000 [1],[3]
Accumulated Depreciation 13,319,000 [2],[3]
Somerset County [Member] | Warren [Member] | 10 Independence Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2009 [3]
Related Encumbrances 15,908,000 [3]
Initial Costs, Land 2,300,000 [3]
Initial Costs, Building and Improvements 15,499,000 [3]
Costs Capitalized Subsequent to Acquisition 161,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,300,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,660,000 [1],[3]
Total 17,960,000 [1],[3]
Accumulated Depreciation 1,504,000 [2],[3]
Union County [Member] | Clark [Member] | 100 Walnut Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 1994 [3]
Related Encumbrances 19,241,000 [3]
Costs Capitalized Subsequent to Acquisition 17,715,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,822,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,893,000 [1],[3]
Total 17,715,000 [1],[3]
Accumulated Depreciation 9,840,000 [2],[3]
Union County [Member] | Cranford [Member] | 6 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1973 [3]
Year Acquired 1994 [3]
Initial Costs, Land 250,000 [3]
Costs Capitalized Subsequent to Acquisition 2,867,000 [3]
Gross Amount at Which Carried at Close of Period, Land 250,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,867,000 [1],[3]
Total 3,117,000 [1],[3]
Accumulated Depreciation 2,029,000 [2],[3]
Union County [Member] | Cranford [Member] | 11 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 1994 [3]
Initial Costs, Land 470,000 [3]
Costs Capitalized Subsequent to Acquisition 5,865,000 [3]
Gross Amount at Which Carried at Close of Period, Land 470,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,865,000 [1],[3]
Total 6,335,000 [1],[3]
Accumulated Depreciation 4,472,000 [2],[3]
Union County [Member] | Cranford [Member] | 12 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1967 [3]
Year Acquired 1997 [3]
Initial Costs, Land 887,000 [3]
Initial Costs, Building and Improvements 3,549,000 [3]
Costs Capitalized Subsequent to Acquisition 2,212,000 [3]
Gross Amount at Which Carried at Close of Period, Land 887,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,761,000 [1],[3]
Total 6,648,000 [1],[3]
Accumulated Depreciation 2,531,000 [2],[3]
Union County [Member] | Cranford [Member] | 14 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1971 [3]
Year Acquired 2003 [3]
Initial Costs, Land 1,283,000 [3]
Initial Costs, Building and Improvements 6,344,000 [3]
Costs Capitalized Subsequent to Acquisition 1,110,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,283,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,454,000 [1],[3]
Total 8,737,000 [1],[3]
Accumulated Depreciation 1,831,000 [2],[3]
Union County [Member] | Cranford [Member] | 20 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1994 [3]
Initial Costs, Land 2,346,000 [3]
Costs Capitalized Subsequent to Acquisition 20,003,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,346,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 20,003,000 [1],[3]
Total 22,349,000 [1],[3]
Accumulated Depreciation 9,838,000 [2],[3]
Union County [Member] | Cranford [Member] | 25 Commerce Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1971 [3]
Year Acquired 2002 [3]
Initial Costs, Land 1,520,000 [3]
Initial Costs, Building and Improvements 6,186,000 [3]
Costs Capitalized Subsequent to Acquisition 692,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,520,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,878,000 [1],[3]
Total 8,398,000 [1],[3]
Accumulated Depreciation 2,502,000 [2],[3]
Union County [Member] | Cranford [Member] | 65 Jackson Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1994 [3]
Initial Costs, Land 541,000 [3]
Costs Capitalized Subsequent to Acquisition 6,768,000 [3]
Gross Amount at Which Carried at Close of Period, Land 542,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,767,000 [1],[3]
Total 7,309,000 [1],[3]
Accumulated Depreciation 4,446,000 [2],[3]
Union County [Member] | New Providence [Member] | 890 Mountain Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,796,000 [3]
Initial Costs, Building and Improvements 11,185,000 [3]
Costs Capitalized Subsequent to Acquisition 5,173,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,765,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,389,000 [1],[3]
Total 19,154,000 [1],[3]
Accumulated Depreciation 5,350,000 [2],[3]
New York County [Member] | New York [Member] | 125 Broad Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1970 [3]
Year Acquired 2007 [3]
Initial Costs, Land 50,191,000 [3]
Initial Costs, Building and Improvements 207,002,000 [3]
Costs Capitalized Subsequent to Acquisition 19,426,000 [3]
Gross Amount at Which Carried at Close of Period, Land 50,191,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 226,428,000 [1],[3]
Total 276,619,000 [1],[3]
Accumulated Depreciation 26,114,000 [2],[3]
Rockland County [Member] | Suffern [Member] | 400 Rella Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1995 [3]
Initial Costs, Land 1,090,000 [3]
Initial Costs, Building and Improvements 13,412,000 [3]
Costs Capitalized Subsequent to Acquisition 3,110,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,090,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 16,522,000 [1],[3]
Total 17,612,000 [1],[3]
Accumulated Depreciation 7,235,000 [2],[3]
Westchester County [Member] | Elmsford [Member] | 11 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1974 [5]
Year Acquired 1997 [5]
Initial Costs, Land 149,000 [5]
Initial Costs, Building and Improvements 2,159,000 [5]
Costs Capitalized Subsequent to Acquisition 493,000 [5]
Gross Amount at Which Carried at Close of Period, Land 149,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,652,000 [1],[5]
Total 2,801,000 [1],[5]
Accumulated Depreciation 1,073,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 75 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1997 [5]
Initial Costs, Land 2,314,000 [5]
Initial Costs, Building and Improvements 4,716,000 [5]
Costs Capitalized Subsequent to Acquisition 107,000 [5]
Gross Amount at Which Carried at Close of Period, Land 2,314,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,823,000 [1],[5]
Total 7,137,000 [1],[5]
Accumulated Depreciation 1,818,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 100 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1975 [3]
Year Acquired 1997 [3]
Initial Costs, Land 220,000 [3]
Initial Costs, Building and Improvements 5,366,000 [3]
Costs Capitalized Subsequent to Acquisition 812,000 [3]
Gross Amount at Which Carried at Close of Period, Land 220,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,178,000 [1],[3]
Total 6,398,000 [1],[3]
Accumulated Depreciation 2,471,000 [2],[3]
Westchester County [Member] | Elmsford [Member] | 125 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 2002 [5]
Year Acquired 2002 [5]
Initial Costs, Land 1,055,000 [5]
Initial Costs, Building and Improvements 3,676,000 [5]
Costs Capitalized Subsequent to Acquisition (51,000) [5]
Gross Amount at Which Carried at Close of Period, Land 1,055,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,625,000 [1],[5]
Total 4,680,000 [1],[5]
Accumulated Depreciation 1,577,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 150 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1975 [5]
Year Acquired 1997 [5]
Initial Costs, Land 497,000 [5]
Initial Costs, Building and Improvements 7,030,000 [5]
Costs Capitalized Subsequent to Acquisition 1,334,000 [5]
Gross Amount at Which Carried at Close of Period, Land 497,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,364,000 [1],[5]
Total 8,861,000 [1],[5]
Accumulated Depreciation 3,126,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 175 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1973 [5]
Year Acquired 1997 [5]
Initial Costs, Land 655,000 [5]
Initial Costs, Building and Improvements 7,473,000 [5]
Costs Capitalized Subsequent to Acquisition 968,000 [5]
Gross Amount at Which Carried at Close of Period, Land 655,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,441,000 [1],[5]
Total 9,096,000 [1],[5]
Accumulated Depreciation 3,347,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 200 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1974 [5]
Year Acquired 1997 [5]
Initial Costs, Land 579,000 [5]
Initial Costs, Building and Improvements 6,620,000 [5]
Costs Capitalized Subsequent to Acquisition 1,696,000 [5]
Gross Amount at Which Carried at Close of Period, Land 579,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,316,000 [1],[5]
Total 8,895,000 [1],[5]
Accumulated Depreciation 3,212,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 250 Clearbrook Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1973 [5]
Year Acquired 1997 [5]
Initial Costs, Land 867,000 [5]
Initial Costs, Building and Improvements 8,647,000 [5]
Costs Capitalized Subsequent to Acquisition 1,309,000 [5]
Gross Amount at Which Carried at Close of Period, Land 867,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,956,000 [1],[5]
Total 10,823,000 [1],[5]
Accumulated Depreciation 3,749,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 50 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1969 [5]
Year Acquired 1997 [5]
Initial Costs, Land 237,000 [5]
Initial Costs, Building and Improvements 2,617,000 [5]
Costs Capitalized Subsequent to Acquisition 234,000 [5]
Gross Amount at Which Carried at Close of Period, Land 237,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,851,000 [1],[5]
Total 3,088,000 [1],[5]
Accumulated Depreciation 1,044,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 77 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1977 [5]
Year Acquired 1997 [5]
Initial Costs, Land 34,000 [5]
Initial Costs, Building and Improvements 1,104,000 [5]
Costs Capitalized Subsequent to Acquisition 179,000 [5]
Gross Amount at Which Carried at Close of Period, Land 34,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,283,000 [1],[5]
Total 1,317,000 [1],[5]
Accumulated Depreciation 459,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 85 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1968 [5]
Year Acquired 1997 [5]
Initial Costs, Land 155,000 [5]
Initial Costs, Building and Improvements 2,507,000 [5]
Costs Capitalized Subsequent to Acquisition 647,000 [5]
Gross Amount at Which Carried at Close of Period, Land 155,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,154,000 [1],[5]
Total 3,309,000 [1],[5]
Accumulated Depreciation 1,368,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 101 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1971 [3]
Year Acquired 1997 [3]
Initial Costs, Land 267,000 [3]
Initial Costs, Building and Improvements 5,838,000 [3]
Costs Capitalized Subsequent to Acquisition 754,000 [3]
Gross Amount at Which Carried at Close of Period, Land 267,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,592,000 [1],[3]
Total 6,859,000 [1],[3]
Accumulated Depreciation 2,533,000 [2],[3]
Westchester County [Member] | Elmsford [Member] | 300 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1970 [5]
Year Acquired 1997 [5]
Initial Costs, Land 460,000 [5]
Initial Costs, Building and Improvements 3,609,000 [5]
Costs Capitalized Subsequent to Acquisition 376,000 [5]
Gross Amount at Which Carried at Close of Period, Land 460,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,985,000 [1],[5]
Total 4,445,000 [1],[5]
Accumulated Depreciation 1,581,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 350 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1970 [5]
Year Acquired 1997 [5]
Initial Costs, Land 100,000 [5]
Initial Costs, Building and Improvements 1,793,000 [5]
Costs Capitalized Subsequent to Acquisition 15,000 [5]
Gross Amount at Which Carried at Close of Period, Land 100,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,808,000 [1],[5]
Total 1,908,000 [1],[5]
Accumulated Depreciation 674,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 399 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1962 [5]
Year Acquired 1997 [5]
Initial Costs, Land 531,000 [5]
Initial Costs, Building and Improvements 7,191,000 [5]
Costs Capitalized Subsequent to Acquisition 163,000 [5]
Gross Amount at Which Carried at Close of Period, Land 531,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,354,000 [1],[5]
Total 7,885,000 [1],[5]
Accumulated Depreciation 2,734,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 400 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1970 [5]
Year Acquired 1997 [5]
Initial Costs, Land 2,202,000 [5]
Initial Costs, Building and Improvements 1,846,000 [5]
Costs Capitalized Subsequent to Acquisition 819,000 [5]
Gross Amount at Which Carried at Close of Period, Land 2,202,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,665,000 [1],[5]
Total 4,867,000 [1],[5]
Accumulated Depreciation 907,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 500 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1970 [5]
Year Acquired 1997 [5]
Initial Costs, Land 258,000 [5]
Initial Costs, Building and Improvements 4,183,000 [5]
Costs Capitalized Subsequent to Acquisition 690,000 [5]
Gross Amount at Which Carried at Close of Period, Land 258,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,873,000 [1],[5]
Total 5,131,000 [1],[5]
Accumulated Depreciation 2,023,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 525 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1972 [5]
Year Acquired 1997 [5]
Initial Costs, Land 345,000 [5]
Initial Costs, Building and Improvements 5,499,000 [5]
Costs Capitalized Subsequent to Acquisition 910,000 [5]
Gross Amount at Which Carried at Close of Period, Land 345,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,409,000 [1],[5]
Total 6,754,000 [1],[5]
Accumulated Depreciation 2,373,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 700 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built N/A [6]
Year Acquired 1997 [6]
Initial Costs, Land 970,000 [6]
Gross Amount at Which Carried at Close of Period, Land 970,000 [1],[6]
Total 970,000 [1],[6]
Westchester County [Member] | Elmsford [Member] | 555 Taxter Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 2000 [3]
Initial Costs, Land 4,285,000 [3]
Initial Costs, Building and Improvements 17,205,000 [3]
Costs Capitalized Subsequent to Acquisition 5,260,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,285,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 22,465,000 [1],[3]
Total 26,750,000 [1],[3]
Accumulated Depreciation 8,205,000 [2],[3]
Westchester County [Member] | Elmsford [Member] | 565 Taxter Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2000 [3]
Initial Costs, Land 4,285,000 [3]
Initial Costs, Building and Improvements 17,205,000 [3]
Costs Capitalized Subsequent to Acquisition 4,269,000 [3]
Gross Amount at Which Carried at Close of Period, Land 4,233,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,526,000 [1],[3]
Total 25,759,000 [1],[3]
Accumulated Depreciation 7,462,000 [2],[3]
Westchester County [Member] | Elmsford [Member] | 570 Taxter Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1972 [3]
Year Acquired 1997 [3]
Initial Costs, Land 438,000 [3]
Initial Costs, Building and Improvements 6,078,000 [3]
Costs Capitalized Subsequent to Acquisition 1,324,000 [3]
Gross Amount at Which Carried at Close of Period, Land 438,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,402,000 [1],[3]
Total 7,840,000 [1],[3]
Accumulated Depreciation 2,691,000 [2],[3]
Westchester County [Member] | Elmsford [Member] | 1 Warehouse Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1957 [4],[7]
Year Acquired 1997 [4],[7]
Initial Costs, Land 3,000 [4],[7]
Initial Costs, Building and Improvements 268,000 [4],[7]
Costs Capitalized Subsequent to Acquisition 265,000 [4],[7]
Gross Amount at Which Carried at Close of Period, Land 3,000 [1],[4],[7]
Gross Amount at Which Carried at Close of Period, Building and Improvements 533,000 [1],[4],[7]
Total 536,000 [1],[4],[7]
Accumulated Depreciation 199,000 [2],[4],[7]
Westchester County [Member] | Elmsford [Member] | 2 Warehouse Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1957 [4],[7]
Year Acquired 1997 [4],[7]
Initial Costs, Land 4,000 [4],[7]
Initial Costs, Building and Improvements 672,000 [4],[7]
Costs Capitalized Subsequent to Acquisition 113,000 [4],[7]
Gross Amount at Which Carried at Close of Period, Land 4,000 [1],[4],[7]
Gross Amount at Which Carried at Close of Period, Building and Improvements 785,000 [1],[4],[7]
Total 789,000 [1],[4],[7]
Accumulated Depreciation 314,000 [2],[4],[7]
Westchester County [Member] | Elmsford [Member] | 3 Warehouse Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1957 [4],[7]
Year Acquired 1997 [4],[7]
Initial Costs, Land 21,000 [4],[7]
Initial Costs, Building and Improvements 1,948,000 [4],[7]
Costs Capitalized Subsequent to Acquisition 526,000 [4],[7]
Gross Amount at Which Carried at Close of Period, Land 21,000 [1],[4],[7]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,474,000 [1],[4],[7]
Total 2,495,000 [1],[4],[7]
Accumulated Depreciation 1,076,000 [2],[4],[7]
Westchester County [Member] | Elmsford [Member] | 4 Warehouse Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1957 [4],[7]
Year Acquired 1997 [4],[7]
Initial Costs, Land 84,000 [4],[7]
Initial Costs, Building and Improvements 13,393,000 [4],[7]
Costs Capitalized Subsequent to Acquisition 3,677,000 [4],[7]
Gross Amount at Which Carried at Close of Period, Land 85,000 [1],[4],[7]
Gross Amount at Which Carried at Close of Period, Building and Improvements 17,069,000 [1],[4],[7]
Total 17,154,000 [1],[4],[7]
Accumulated Depreciation 6,499,000 [2],[4],[7]
Westchester County [Member] | Elmsford [Member] | 5 Warehouse Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1957 [4],[7]
Year Acquired 1997 [4],[7]
Initial Costs, Land 19,000 [4],[7]
Initial Costs, Building and Improvements 4,804,000 [4],[7]
Costs Capitalized Subsequent to Acquisition 1,490,000 [4],[7]
Gross Amount at Which Carried at Close of Period, Land 19,000 [1],[4],[7]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,294,000 [1],[4],[7]
Total 6,313,000 [1],[4],[7]
Accumulated Depreciation 2,581,000 [2],[4],[7]
Westchester County [Member] | Elmsford [Member] | 6 Warehouse Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [4],[7]
Year Acquired 1997 [4],[7]
Initial Costs, Land 10,000 [4],[7]
Initial Costs, Building and Improvements 4,419,000 [4],[7]
Costs Capitalized Subsequent to Acquisition 2,108,000 [4],[7]
Gross Amount at Which Carried at Close of Period, Land 10,000 [1],[4],[7]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,527,000 [1],[4],[7]
Total 6,537,000 [1],[4],[7]
Accumulated Depreciation 1,886,000 [2],[4],[7]
Westchester County [Member] | Elmsford [Member] | 1 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1967 [5]
Year Acquired 1997 [5]
Initial Costs, Land 199,000 [5]
Initial Costs, Building and Improvements 2,023,000 [5]
Costs Capitalized Subsequent to Acquisition 425,000 [5]
Gross Amount at Which Carried at Close of Period, Land 199,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,448,000 [1],[5]
Total 2,647,000 [1],[5]
Accumulated Depreciation 850,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 2 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1968 [5]
Year Acquired 1997 [5]
Initial Costs, Land 234,000 [5]
Initial Costs, Building and Improvements 2,726,000 [5]
Costs Capitalized Subsequent to Acquisition 262,000 [5]
Gross Amount at Which Carried at Close of Period, Land 234,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,988,000 [1],[5]
Total 3,222,000 [1],[5]
Accumulated Depreciation 1,170,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 3 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1969 [5]
Year Acquired 1997 [5]
Initial Costs, Land 655,000 [5]
Initial Costs, Building and Improvements 7,936,000 [5]
Costs Capitalized Subsequent to Acquisition 1,156,000 [5]
Gross Amount at Which Carried at Close of Period, Land 655,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,092,000 [1],[5]
Total 9,747,000 [1],[5]
Accumulated Depreciation 3,430,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 4 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1969 [5]
Year Acquired 1997 [5]
Initial Costs, Land 320,000 [5]
Initial Costs, Building and Improvements 3,729,000 [5]
Costs Capitalized Subsequent to Acquisition 923,000 [5]
Gross Amount at Which Carried at Close of Period, Land 320,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,652,000 [1],[5]
Total 4,972,000 [1],[5]
Accumulated Depreciation 1,618,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 5 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1969 [5]
Year Acquired 1997 [5]
Initial Costs, Land 118,000 [5]
Initial Costs, Building and Improvements 1,949,000 [5]
Costs Capitalized Subsequent to Acquisition 511,000 [5]
Gross Amount at Which Carried at Close of Period, Land 118,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,460,000 [1],[5]
Total 2,578,000 [1],[5]
Accumulated Depreciation 928,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 6 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1968 [5]
Year Acquired 1997 [5]
Initial Costs, Land 164,000 [5]
Initial Costs, Building and Improvements 1,998,000 [5]
Costs Capitalized Subsequent to Acquisition 129,000 [5]
Gross Amount at Which Carried at Close of Period, Land 164,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,127,000 [1],[5]
Total 2,291,000 [1],[5]
Accumulated Depreciation 802,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 7 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1972 [5]
Year Acquired 1997 [5]
Initial Costs, Land 286,000 [5]
Initial Costs, Building and Improvements 4,321,000 [5]
Costs Capitalized Subsequent to Acquisition 224,000 [5]
Gross Amount at Which Carried at Close of Period, Land 286,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,545,000 [1],[5]
Total 4,831,000 [1],[5]
Accumulated Depreciation 1,683,000 [2],[5]
Westchester County [Member] | Elmsford [Member] | 8 Westchester Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1971 [5]
Year Acquired 1997 [5]
Initial Costs, Land 447,000 [5]
Initial Costs, Building and Improvements 5,262,000 [5]
Costs Capitalized Subsequent to Acquisition 1,003,000 [5]
Gross Amount at Which Carried at Close of Period, Land 447,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,265,000 [1],[5]
Total 6,712,000 [1],[5]
Accumulated Depreciation 2,547,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 200 Saw Mill River Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1965 [5]
Year Acquired 1997 [5]
Initial Costs, Land 353,000 [5]
Initial Costs, Building and Improvements 3,353,000 [5]
Costs Capitalized Subsequent to Acquisition 756,000 [5]
Gross Amount at Which Carried at Close of Period, Land 353,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,109,000 [1],[5]
Total 4,462,000 [1],[5]
Accumulated Depreciation 1,413,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 1 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980 [3]
Year Acquired 1997 [3]
Initial Costs, Land 66,000 [3]
Initial Costs, Building and Improvements 1,711,000 [3]
Costs Capitalized Subsequent to Acquisition 301,000 [3]
Gross Amount at Which Carried at Close of Period, Land 66,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,012,000 [1],[3]
Total 2,078,000 [1],[3]
Accumulated Depreciation 820,000 [2],[3]
Westchester County [Member] | Hawthorne [Member] | 2 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1997 [3]
Initial Costs, Land 109,000 [3]
Initial Costs, Building and Improvements 3,128,000 [3]
Costs Capitalized Subsequent to Acquisition 1,533,000 [3]
Gross Amount at Which Carried at Close of Period, Land 109,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,661,000 [1],[3]
Total 4,770,000 [1],[3]
Accumulated Depreciation 1,483,000 [2],[3]
Westchester County [Member] | Hawthorne [Member] | 4 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [5]
Year Acquired 1997 [5]
Initial Costs, Land 363,000 [5]
Initial Costs, Building and Improvements 7,513,000 [5]
Costs Capitalized Subsequent to Acquisition 2,889,000 [5]
Gross Amount at Which Carried at Close of Period, Land 363,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,402,000 [1],[5]
Total 10,765,000 [1],[5]
Accumulated Depreciation 3,840,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 5 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980 [5]
Year Acquired 2001 [5]
Initial Costs, Land 2,219,000 [5]
Initial Costs, Building and Improvements 8,916,000 [5]
Costs Capitalized Subsequent to Acquisition 1,584,000 [5]
Gross Amount at Which Carried at Close of Period, Land 2,219,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,500,000 [1],[5]
Total 12,719,000 [1],[5]
Accumulated Depreciation 3,813,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 6 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980 [5]
Year Acquired 2001 [5]
Initial Costs, Land 740,000 [5]
Initial Costs, Building and Improvements 2,971,000 [5]
Costs Capitalized Subsequent to Acquisition 1,021,000 [5]
Gross Amount at Which Carried at Close of Period, Land 740,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,992,000 [1],[5]
Total 4,732,000 [1],[5]
Accumulated Depreciation 1,436,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 7 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1998 [3]
Initial Costs, Land 330,000 [3]
Initial Costs, Building and Improvements 13,013,000 [3]
Costs Capitalized Subsequent to Acquisition 2,697,000 [3]
Gross Amount at Which Carried at Close of Period, Land 330,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,710,000 [1],[3]
Total 16,040,000 [1],[3]
Accumulated Depreciation 5,683,000 [2],[3]
Westchester County [Member] | Hawthorne [Member] | 8 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [5]
Year Acquired 1997 [5]
Initial Costs, Land 212,000 [5]
Initial Costs, Building and Improvements 4,410,000 [5]
Costs Capitalized Subsequent to Acquisition 1,048,000 [5]
Gross Amount at Which Carried at Close of Period, Land 212,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,458,000 [1],[5]
Total 5,670,000 [1],[5]
Accumulated Depreciation 2,147,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 10 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [5]
Year Acquired 1997 [5]
Initial Costs, Land 134,000 [5]
Initial Costs, Building and Improvements 2,799,000 [5]
Costs Capitalized Subsequent to Acquisition 753,000 [5]
Gross Amount at Which Carried at Close of Period, Land 134,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,552,000 [1],[5]
Total 3,686,000 [1],[5]
Accumulated Depreciation 1,363,000 [2],[5]
Westchester County [Member] | Hawthorne [Member] | 11 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [4],[5]
Year Acquired 1997 [4],[5]
Initial Costs, Building and Improvements 4,788,000 [4],[5]
Costs Capitalized Subsequent to Acquisition 97,000 [4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,885,000 [1],[4],[5]
Total 4,885,000 [1],[4],[5]
Accumulated Depreciation 1,822,000 [2],[4],[5]
Westchester County [Member] | Hawthorne [Member] | 12 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1999 [4],[5]
Year Acquired 1999 [4],[5]
Initial Costs, Land 1,562,000 [4],[5]
Initial Costs, Building and Improvements 3,254,000 [4],[5]
Costs Capitalized Subsequent to Acquisition 844,000 [4],[5]
Gross Amount at Which Carried at Close of Period, Land 1,320,000 [1],[4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,340,000 [1],[4],[5]
Total 5,660,000 [1],[4],[5]
Accumulated Depreciation 1,853,000 [2],[4],[5]
Westchester County [Member] | Hawthorne [Member] | 15 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [4],[5]
Year Acquired 1997 [4],[5]
Initial Costs, Building and Improvements 7,449,000 [4],[5]
Costs Capitalized Subsequent to Acquisition 546,000 [4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,995,000 [1],[4],[5]
Total 7,995,000 [1],[4],[5]
Accumulated Depreciation 3,111,000 [2],[4],[5]
Westchester County [Member] | Hawthorne [Member] | 17 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [4],[5]
Year Acquired 1997 [4],[5]
Initial Costs, Building and Improvements 7,269,000 [4],[5]
Costs Capitalized Subsequent to Acquisition 1,161,000 [4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,430,000 [1],[4],[5]
Total 8,430,000 [1],[4],[5]
Accumulated Depreciation 2,930,000 [2],[4],[5]
Westchester County [Member] | Hawthorne [Member] | 19 Skyline Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 1997 [3]
Initial Costs, Land 2,355,000 [3]
Initial Costs, Building and Improvements 34,254,000 [3]
Costs Capitalized Subsequent to Acquisition 1,189,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,356,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 35,442,000 [1],[3]
Total 37,798,000 [1],[3]
Accumulated Depreciation 13,597,000 [2],[3]
Westchester County [Member] | Tarrytown [Member] | 200 White Plains Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 1997 [3]
Initial Costs, Land 378,000 [3]
Initial Costs, Building and Improvements 8,367,000 [3]
Costs Capitalized Subsequent to Acquisition 2,045,000 [3]
Gross Amount at Which Carried at Close of Period, Land 378,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,412,000 [1],[3]
Total 10,790,000 [1],[3]
Accumulated Depreciation 3,916,000 [2],[3]
Westchester County [Member] | Tarrytown [Member] | 220 White Plains Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1997 [3]
Initial Costs, Land 367,000 [3]
Initial Costs, Building and Improvements 8,112,000 [3]
Costs Capitalized Subsequent to Acquisition 1,635,000 [3]
Gross Amount at Which Carried at Close of Period, Land 367,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,747,000 [1],[3]
Total 10,114,000 [1],[3]
Accumulated Depreciation 3,644,000 [2],[3]
Westchester County [Member] | Tarrytown [Member] | 230 White Plains Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [8]
Year Acquired 1997 [8]
Initial Costs, Land 124,000 [8]
Initial Costs, Building and Improvements 1,845,000 [8]
Costs Capitalized Subsequent to Acquisition 107,000 [8]
Gross Amount at Which Carried at Close of Period, Land 124,000 [1],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,952,000 [1],[8]
Total 2,076,000 [1],[8]
Accumulated Depreciation 714,000 [2],[8]
Westchester County [Member] | White Plains [Member] | 1 Barker Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1975 [3]
Year Acquired 1997 [3]
Initial Costs, Land 208,000 [3]
Initial Costs, Building and Improvements 9,629,000 [3]
Costs Capitalized Subsequent to Acquisition 2,187,000 [3]
Gross Amount at Which Carried at Close of Period, Land 207,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,817,000 [1],[3]
Total 12,024,000 [1],[3]
Accumulated Depreciation 4,181,000 [2],[3]
Westchester County [Member] | White Plains [Member] | 3 Barker Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [3]
Year Acquired 1997 [3]
Initial Costs, Land 122,000 [3]
Initial Costs, Building and Improvements 7,864,000 [3]
Costs Capitalized Subsequent to Acquisition 2,250,000 [3]
Gross Amount at Which Carried at Close of Period, Land 122,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 10,114,000 [1],[3]
Total 10,236,000 [1],[3]
Accumulated Depreciation 4,430,000 [2],[3]
Westchester County [Member] | White Plains [Member] | 50 Main Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 1997 [3]
Initial Costs, Land 564,000 [3]
Initial Costs, Building and Improvements 48,105,000 [3]
Costs Capitalized Subsequent to Acquisition 11,866,000 [3]
Gross Amount at Which Carried at Close of Period, Land 564,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 59,971,000 [1],[3]
Total 60,535,000 [1],[3]
Accumulated Depreciation 21,892,000 [2],[3]
Westchester County [Member] | White Plains [Member] | 11 Martine Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1997 [3]
Initial Costs, Land 127,000 [3]
Initial Costs, Building and Improvements 26,833,000 [3]
Costs Capitalized Subsequent to Acquisition 8,352,000 [3]
Gross Amount at Which Carried at Close of Period, Land 127,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 35,185,000 [1],[3]
Total 35,312,000 [1],[3]
Accumulated Depreciation 12,842,000 [2],[3]
Westchester County [Member] | White Plains [Member] | 1 Water Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1979 [3]
Year Acquired 1997 [3]
Initial Costs, Land 211,000 [3]
Initial Costs, Building and Improvements 5,382,000 [3]
Costs Capitalized Subsequent to Acquisition 1,099,000 [3]
Gross Amount at Which Carried at Close of Period, Land 211,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 6,481,000 [1],[3]
Total 6,692,000 [1],[3]
Accumulated Depreciation 2,705,000 [2],[3]
Westchester County [Member] | Yonkers [Member] | 100 Corporate Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [5]
Year Acquired 1997 [5]
Initial Costs, Land 602,000 [5]
Initial Costs, Building and Improvements 9,910,000 [5]
Costs Capitalized Subsequent to Acquisition 1,515,000 [5]
Gross Amount at Which Carried at Close of Period, Land 602,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,425,000 [1],[5]
Total 12,027,000 [1],[5]
Accumulated Depreciation 4,477,000 [2],[5]
Westchester County [Member] | Yonkers [Member] | 200 Corporate Boulevard South [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1997 [5]
Initial Costs, Land 502,000 [5]
Initial Costs, Building and Improvements 7,575,000 [5]
Costs Capitalized Subsequent to Acquisition 1,468,000 [5]
Gross Amount at Which Carried at Close of Period, Land 502,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,043,000 [1],[5]
Total 9,545,000 [1],[5]
Accumulated Depreciation 3,103,000 [2],[5]
Westchester County [Member] | Yonkers [Member] | 1 Enterprise Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built N/A [6]
Year Acquired 1997 [6]
Initial Costs, Land 1,379,000 [6]
Costs Capitalized Subsequent to Acquisition 1,000 [6]
Gross Amount at Which Carried at Close of Period, Land 1,380,000 [1],[6]
Total 1,380,000 [1],[6]
Westchester County [Member] | Yonkers [Member] | 1 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,104,000 [3]
Initial Costs, Building and Improvements 11,904,000 [3]
Costs Capitalized Subsequent to Acquisition 3,267,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,105,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,170,000 [1],[3]
Total 16,275,000 [1],[3]
Accumulated Depreciation 6,006,000 [2],[3]
Westchester County [Member] | Yonkers [Member] | 2 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [8]
Year Acquired 1997 [8]
Initial Costs, Land 89,000 [8]
Initial Costs, Building and Improvements 2,439,000 [8]
Costs Capitalized Subsequent to Acquisition 100,000 [8]
Gross Amount at Which Carried at Close of Period, Land 89,000 [1],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements 2,539,000 [1],[8]
Total 2,628,000 [1],[8]
Accumulated Depreciation 911,000 [2],[8]
Westchester County [Member] | Yonkers [Member] | 3 Executive Boulevard [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1997 [3]
Initial Costs, Land 385,000 [3]
Initial Costs, Building and Improvements 6,256,000 [3]
Costs Capitalized Subsequent to Acquisition 1,560,000 [3]
Gross Amount at Which Carried at Close of Period, Land 385,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,816,000 [1],[3]
Total 8,201,000 [1],[3]
Accumulated Depreciation 2,834,000 [2],[3]
Westchester County [Member] | Yonkers [Member] | 4 Executive Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [5]
Year Acquired 1997 [5]
Initial Costs, Land 584,000 [5]
Initial Costs, Building and Improvements 6,134,000 [5]
Costs Capitalized Subsequent to Acquisition 2,061,000 [5]
Gross Amount at Which Carried at Close of Period, Land 584,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,195,000 [1],[5]
Total 8,779,000 [1],[5]
Accumulated Depreciation 3,913,000 [2],[5]
Westchester County [Member] | Yonkers [Member] | 6 Executive Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [5]
Year Acquired 1997 [5]
Initial Costs, Land 546,000 [5]
Initial Costs, Building and Improvements 7,246,000 [5]
Costs Capitalized Subsequent to Acquisition 1,478,000 [5]
Gross Amount at Which Carried at Close of Period, Land 546,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,724,000 [1],[5]
Total 9,270,000 [1],[5]
Accumulated Depreciation 3,014,000 [2],[5]
Westchester County [Member] | Yonkers [Member] | 1 Odell Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980 [5]
Year Acquired 1997 [5]
Initial Costs, Land 1,206,000 [5]
Initial Costs, Building and Improvements 6,815,000 [5]
Costs Capitalized Subsequent to Acquisition 2,145,000 [5]
Gross Amount at Which Carried at Close of Period, Land 1,206,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,960,000 [1],[5]
Total 10,166,000 [1],[5]
Accumulated Depreciation 3,137,000 [2],[5]
Westchester County [Member] | Yonkers [Member] | 3 Odell Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 2003 [3]
Initial Costs, Land 1,322,000 [3]
Initial Costs, Building and Improvements 4,777,000 [3]
Costs Capitalized Subsequent to Acquisition 2,319,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,322,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 7,096,000 [1],[3]
Total 8,418,000 [1],[3]
Accumulated Depreciation 2,189,000 [2],[3]
Westchester County [Member] | Yonkers [Member] | 5 Odell Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1983 [5]
Year Acquired 1997 [5]
Initial Costs, Land 331,000 [5]
Initial Costs, Building and Improvements 2,988,000 [5]
Costs Capitalized Subsequent to Acquisition 882,000 [5]
Gross Amount at Which Carried at Close of Period, Land 331,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,870,000 [1],[5]
Total 4,201,000 [1],[5]
Accumulated Depreciation 1,544,000 [2],[5]
Westchester County [Member] | Yonkers [Member] | 7 Odell Plaza [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [5]
Year Acquired 1997 [5]
Initial Costs, Land 419,000 [5]
Initial Costs, Building and Improvements 4,418,000 [5]
Costs Capitalized Subsequent to Acquisition 622,000 [5]
Gross Amount at Which Carried at Close of Period, Land 419,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,040,000 [1],[5]
Total 5,459,000 [1],[5]
Accumulated Depreciation 1,935,000 [2],[5]
Chester County [Member] | Berwyn [Member] | 1000 Westlakes Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 1997 [3]
Initial Costs, Land 619,000 [3]
Initial Costs, Building and Improvements 9,016,000 [3]
Costs Capitalized Subsequent to Acquisition 546,000 [3]
Gross Amount at Which Carried at Close of Period, Land 619,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 9,562,000 [1],[3]
Total 10,181,000 [1],[3]
Accumulated Depreciation 3,720,000 [2],[3]
Chester County [Member] | Berwyn [Member] | 1055 Westlakes Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,951,000 [3]
Initial Costs, Building and Improvements 19,046,000 [3]
Costs Capitalized Subsequent to Acquisition 3,908,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,951,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 22,954,000 [1],[3]
Total 24,905,000 [1],[3]
Accumulated Depreciation 9,712,000 [2],[3]
Chester County [Member] | Berwyn [Member] | 1205 Westlakes Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,323,000 [3]
Initial Costs, Building and Improvements 20,098,000 [3]
Costs Capitalized Subsequent to Acquisition 2,943,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,323,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 23,041,000 [1],[3]
Total 24,364,000 [1],[3]
Accumulated Depreciation 8,856,000 [2],[3]
Chester County [Member] | Berwyn [Member] | 1235 Westlakes Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,417,000 [3]
Initial Costs, Building and Improvements 21,215,000 [3]
Costs Capitalized Subsequent to Acquisition 3,711,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,418,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 24,925,000 [1],[3]
Total 26,343,000 [1],[3]
Accumulated Depreciation 9,801,000 [2],[3]
Delaware County [Member] | Lester [Member] | 100 Stevens Dr [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 1996 [3]
Initial Costs, Land 1,349,000 [3]
Initial Costs, Building and Improvements 10,018,000 [3]
Costs Capitalized Subsequent to Acquisition 3,915,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,349,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 13,933,000 [1],[3]
Total 15,282,000 [1],[3]
Accumulated Depreciation 6,038,000 [2],[3]
Delaware County [Member] | Lester [Member] | 200 Stevens Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1996 [3]
Initial Costs, Land 1,644,000 [3]
Initial Costs, Building and Improvements 20,186,000 [3]
Costs Capitalized Subsequent to Acquisition 6,558,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,644,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 26,744,000 [1],[3]
Total 28,388,000 [1],[3]
Accumulated Depreciation 11,206,000 [2],[3]
Delaware County [Member] | Lester [Member] | 300 Stevens Drive [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1992 [3]
Year Acquired 1996 [3]
Initial Costs, Land 491,000 [3]
Initial Costs, Building and Improvements 9,490,000 [3]
Costs Capitalized Subsequent to Acquisition 1,710,000 [3]
Gross Amount at Which Carried at Close of Period, Land 491,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,200,000 [1],[3]
Total 11,691,000 [1],[3]
Accumulated Depreciation 4,586,000 [2],[3]
Delaware County [Member] | Media [Member] | 1400 Providence Rd, Center I [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [3]
Year Acquired 1996 [3]
Initial Costs, Land 1,042,000 [3]
Initial Costs, Building and Improvements 9,054,000 [3]
Costs Capitalized Subsequent to Acquisition 2,881,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,042,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,935,000 [1],[3]
Total 12,977,000 [1],[3]
Accumulated Depreciation 4,832,000 [2],[3]
Delaware County [Member] | Media [Member] | 1400 Providence Rd, Center II [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1996 [3]
Initial Costs, Land 1,543,000 [3]
Initial Costs, Building and Improvements 16,464,000 [3]
Costs Capitalized Subsequent to Acquisition 4,659,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,544,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,122,000 [1],[3]
Total 22,666,000 [1],[3]
Accumulated Depreciation 8,373,000 [2],[3]
Montgomery County [Member] | Bala Cynwyd [Member] | 150 Monument Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1981 [3]
Year Acquired 2004 [3]
Initial Costs, Land 2,845,000 [3]
Initial Costs, Building and Improvements 14,780,000 [3]
Costs Capitalized Subsequent to Acquisition 4,110,000 [3]
Gross Amount at Which Carried at Close of Period, Land 2,845,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 18,890,000 [1],[3]
Total 21,735,000 [1],[3]
Accumulated Depreciation 4,247,000 [2],[3]
Montgomery County [Member] | Blue Bell [Member] | 4 Sentry Park [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982 [3]
Year Acquired 2003 [3]
Initial Costs, Land 1,749,000 [3]
Initial Costs, Building and Improvements 7,721,000 [3]
Costs Capitalized Subsequent to Acquisition 1,004,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,749,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 8,725,000 [1],[3]
Total 10,474,000 [1],[3]
Accumulated Depreciation 1,942,000 [2],[3]
Montgomery County [Member] | Blue Bell [Member] | 5 Sentry Park East [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1996 [3]
Initial Costs, Land 642,000 [3]
Initial Costs, Building and Improvements 7,992,000 [3]
Costs Capitalized Subsequent to Acquisition 3,590,000 [3]
Gross Amount at Which Carried at Close of Period, Land 642,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,582,000 [1],[3]
Total 12,224,000 [1],[3]
Accumulated Depreciation 4,107,000 [2],[3]
Montgomery County [Member] | Blue Bell [Member] | 5 Sentry Park West [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 1996 [3]
Initial Costs, Land 268,000 [3]
Initial Costs, Building and Improvements 3,334,000 [3]
Costs Capitalized Subsequent to Acquisition 616,000 [3]
Gross Amount at Which Carried at Close of Period, Land 268,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,950,000 [1],[3]
Total 4,218,000 [1],[3]
Accumulated Depreciation 1,441,000 [2],[3]
Montgomery County [Member] | Blue Bell [Member] | 16 Sentry Park West [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2002 [3]
Initial Costs, Land 3,377,000 [3]
Initial Costs, Building and Improvements 13,511,000 [3]
Costs Capitalized Subsequent to Acquisition 2,190,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,377,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,701,000 [1],[3]
Total 19,078,000 [1],[3]
Accumulated Depreciation 5,299,000 [2],[3]
Montgomery County [Member] | Blue Bell [Member] | 18 Sentry Park West [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [3]
Year Acquired 2002 [3]
Initial Costs, Land 3,515,000 [3]
Initial Costs, Building and Improvements 14,062,000 [3]
Costs Capitalized Subsequent to Acquisition 2,157,000 [3]
Gross Amount at Which Carried at Close of Period, Land 3,515,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 16,219,000 [1],[3]
Total 19,734,000 [1],[3]
Accumulated Depreciation 5,397,000 [2],[3]
Montgomery County [Member] | King of Prussia [Member] | 2200 Renaissance Blvd [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 2002 [3]
Related Encumbrances 16,171,000 [3]
Initial Costs, Land 5,347,000 [3]
Initial Costs, Building and Improvements 21,453,000 [3]
Costs Capitalized Subsequent to Acquisition (9,121,000) [3]
Gross Amount at Which Carried at Close of Period, Land 3,126,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 14,553,000 [1],[3]
Total 17,679,000 [1],[3]
Accumulated Depreciation 4,934,000 [2],[3]
Montgomery County [Member] | Lower Providence [Member] | 1000 Madison Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [3]
Year Acquired 1997 [3]
Initial Costs, Land 1,713,000 [3]
Initial Costs, Building and Improvements 12,559,000 [3]
Costs Capitalized Subsequent to Acquisition 3,393,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,714,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,951,000 [1],[3]
Total 17,665,000 [1],[3]
Accumulated Depreciation 6,213,000 [2],[3]
Montgomery County [Member] | Plymouth Meeting [Member] | 1150 Plymouth Meeting Mall [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1970 [3]
Year Acquired 1997 [3]
Initial Costs, Land 125,000 [3]
Initial Costs, Building and Improvements 499,000 [3]
Costs Capitalized Subsequent to Acquisition 31,474,000 [3]
Gross Amount at Which Carried at Close of Period, Land 6,219,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 25,879,000 [1],[3]
Total 32,098,000 [1],[3]
Accumulated Depreciation 10,076,000 [2],[3]
Fairfield County [Member] | Norwalk [Member] | 40 Richards Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1985 [3]
Year Acquired 1998 [3]
Initial Costs, Land 1,087,000 [3]
Initial Costs, Building and Improvements 18,399,000 [3]
Costs Capitalized Subsequent to Acquisition 4,809,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,087,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 23,208,000 [1],[3]
Total 24,295,000 [1],[3]
Accumulated Depreciation 7,585,000 [2],[3]
Fairfield County [Member] | Stamford [Member] | 1266 East Main Street [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984 [3]
Year Acquired 2002 [3]
Related Encumbrances 15,531,000 [3]
Initial Costs, Land 6,638,000 [3]
Initial Costs, Building and Improvements 26,567,000 [3]
Costs Capitalized Subsequent to Acquisition 5,263,000 [3]
Gross Amount at Which Carried at Close of Period, Land 6,638,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 31,830,000 [1],[3]
Total 38,468,000 [1],[3]
Accumulated Depreciation 9,184,000 [2],[3]
Fairfield County [Member] | Stamford [Member] | 419 West Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1986 [5]
Year Acquired 1997 [5]
Initial Costs, Land 4,538,000 [5]
Initial Costs, Building and Improvements 9,246,000 [5]
Costs Capitalized Subsequent to Acquisition 2,248,000 [5]
Gross Amount at Which Carried at Close of Period, Land 4,538,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 11,494,000 [1],[5]
Total 16,032,000 [1],[5]
Accumulated Depreciation 4,575,000 [2],[5]
Fairfield County [Member] | Stamford [Member] | 500 West Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1988 [5]
Year Acquired 1997 [5]
Initial Costs, Land 415,000 [5]
Initial Costs, Building and Improvements 1,679,000 [5]
Costs Capitalized Subsequent to Acquisition 61,000 [5]
Gross Amount at Which Carried at Close of Period, Land 415,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 1,740,000 [1],[5]
Total 2,155,000 [1],[5]
Accumulated Depreciation 643,000 [2],[5]
Fairfield County [Member] | Stamford [Member] | 550 West Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1990 [5]
Year Acquired 1997 [5]
Initial Costs, Land 1,975,000 [5]
Initial Costs, Building and Improvements 3,856,000 [5]
Costs Capitalized Subsequent to Acquisition 202,000 [5]
Gross Amount at Which Carried at Close of Period, Land 1,975,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,058,000 [1],[5]
Total 6,033,000 [1],[5]
Accumulated Depreciation 1,494,000 [2],[5]
Fairfield County [Member] | Stamford [Member] | 600 West Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1999 [5]
Year Acquired 1999 [5]
Initial Costs, Land 2,305,000 [5]
Initial Costs, Building and Improvements 2,863,000 [5]
Costs Capitalized Subsequent to Acquisition 839,000 [5]
Gross Amount at Which Carried at Close of Period, Land 2,305,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,702,000 [1],[5]
Total 6,007,000 [1],[5]
Accumulated Depreciation 1,150,000 [2],[5]
Fairfield County [Member] | Stamford [Member] | 650 West Avenue [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1998 [5]
Year Acquired 1998 [5]
Initial Costs, Land 1,328,000 [5]
Costs Capitalized Subsequent to Acquisition 3,360,000 [5]
Gross Amount at Which Carried at Close of Period, Land 1,328,000 [1],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements 3,360,000 [1],[5]
Total 4,688,000 [1],[5]
Accumulated Depreciation 1,242,000 [2],[5]
District Of Columbia [Member] | Washington [Member] | 1201 Connecticut Avenue, NW [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1940 [3]
Year Acquired 1999 [3]
Initial Costs, Land 14,228,000 [3]
Initial Costs, Building and Improvements 18,571,000 [3]
Costs Capitalized Subsequent to Acquisition 4,294,000 [3]
Gross Amount at Which Carried at Close of Period, Land 14,228,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 22,865,000 [1],[3]
Total 37,093,000 [1],[3]
Accumulated Depreciation 7,666,000 [2],[3]
District Of Columbia [Member] | Washington [Member] | 1400 L Street, NW [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 1998 [3]
Initial Costs, Land 13,054,000 [3]
Initial Costs, Building and Improvements 27,423,000 [3]
Costs Capitalized Subsequent to Acquisition 7,246,000 [3]
Gross Amount at Which Carried at Close of Period, Land 13,054,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 34,669,000 [1],[3]
Total 47,723,000 [1],[3]
Accumulated Depreciation 13,128,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | Capital Office Park Parcel A [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built N/A [6]
Year Acquired 2009 [6]
Initial Costs, Land 840,000 [6]
Costs Capitalized Subsequent to Acquisition 7,000 [6]
Gross Amount at Which Carried at Close of Period, Land 847,000 [1],[6]
Total 847,000 [1],[6]
Prince George's County [Member] | Greenbelt [Member] | 9200 Edmonston Road [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1973/03 [3]
Year Acquired 2006 [3]
Related Encumbrances 4,479,000 [3]
Initial Costs, Land 1,547,000 [3]
Initial Costs, Building and Improvements 4,131,000 [3]
Costs Capitalized Subsequent to Acquisition 474,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,547,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,605,000 [1],[3]
Total 6,152,000 [1],[3]
Accumulated Depreciation 1,056,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | 6301 Ivy Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1979/95 [3]
Year Acquired 2006 [3]
Related Encumbrances 5,899,000 [3]
Initial Costs, Land 5,168,000 [3]
Initial Costs, Building and Improvements 14,706,000 [3]
Costs Capitalized Subsequent to Acquisition 1,312,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,168,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 16,018,000 [1],[3]
Total 21,186,000 [1],[3]
Accumulated Depreciation 2,662,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | 6303 Ivy Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1980/03 [3]
Year Acquired 2006 [3]
Initial Costs, Land 5,115,000 [3]
Initial Costs, Building and Improvements 13,860,000 [3]
Costs Capitalized Subsequent to Acquisition 596,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,115,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 14,456,000 [1],[3]
Total 19,571,000 [1],[3]
Accumulated Depreciation 2,698,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | 6305 Ivy Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1982/95 [3]
Year Acquired 2006 [3]
Related Encumbrances 6,245,000 [3]
Initial Costs, Land 5,615,000 [3]
Initial Costs, Building and Improvements 14,420,000 [3]
Costs Capitalized Subsequent to Acquisition 385,000 [3]
Gross Amount at Which Carried at Close of Period, Land 5,615,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 14,805,000 [1],[3]
Total 20,420,000 [1],[3]
Accumulated Depreciation 2,654,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | 6404 Ivy Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1987 [3]
Year Acquired 2006 [3]
Initial Costs, Land 7,578,000 [3]
Initial Costs, Building and Improvements 20,785,000 [3]
Costs Capitalized Subsequent to Acquisition 1,301,000 [3]
Gross Amount at Which Carried at Close of Period, Land 7,578,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 22,086,000 [1],[3]
Total 29,664,000 [1],[3]
Accumulated Depreciation 3,915,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | 6406 Ivy Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1991 [3]
Year Acquired 2006 [3]
Initial Costs, Land 7,514,000 [3]
Initial Costs, Building and Improvements 21,152,000 [3]
Costs Capitalized Subsequent to Acquisition 7,000 [3]
Gross Amount at Which Carried at Close of Period, Land 7,514,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 21,159,000 [1],[3]
Total 28,673,000 [1],[3]
Accumulated Depreciation 3,071,000 [2],[3]
Prince George's County [Member] | Greenbelt [Member] | 6411 Ivy Lane [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1984/05 [3]
Year Acquired 2006 [3]
Initial Costs, Land 6,867,000 [3]
Initial Costs, Building and Improvements 17,470,000 [3]
Costs Capitalized Subsequent to Acquisition 1,106,000 [3]
Gross Amount at Which Carried at Close of Period, Land 6,867,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 18,576,000 [1],[3]
Total 25,443,000 [1],[3]
Accumulated Depreciation 3,497,000 [2],[3]
Prince George's County [Member] | Lanham [Member] | 4200 Parliament Place [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Year Built 1989 [3]
Year Acquired 1998 [3]
Initial Costs, Land 2,114,000 [3]
Initial Costs, Building and Improvements 13,546,000 [3]
Costs Capitalized Subsequent to Acquisition 975,000 [3]
Gross Amount at Which Carried at Close of Period, Land 1,393,000 [1],[3]
Gross Amount at Which Carried at Close of Period, Building and Improvements 15,242,000 [1],[3]
Total 16,635,000 [1],[3]
Accumulated Depreciation 5,899,000 [2],[3]
Projects Under Development And Developable Land [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Initial Costs, Land 112,587,000
Initial Costs, Building and Improvements 5,715,000
Gross Amount at Which Carried at Close of Period, Land 112,587,000 [1]
Gross Amount at Which Carried at Close of Period, Building and Improvements 5,715,000 [1]
Total 118,302,000 [1]
Accumulated Depreciation 64,000 [2]
Furniture, Fixtures And Equipment [Member]
  
Real Estate and Accumulated Depreciation [Line Items]  
Costs Capitalized Subsequent to Acquisition 4,465,000
Gross Amount at Which Carried at Close of Period, Building and Improvements 4,465,000 [1]
Total 4,465,000 [1]
Accumulated Depreciation $ 3,508,000 [2]
[1] The aggregate cost for federal income tax purposes at December 31, 2011 was approximately $3.2 billion.
[2] Depreciation of buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.
[3] Office Property
[4] This property is located on land leased by the Company.
[5] Office/Flex Property
[6] Land Lease
[7] Industrial/Warehouse Property
[8] Stand-alone Retail Property