Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details)

v3.6.0.2

Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances		$ 813,585
Initial Costs, Land		697,773
Initial Costs, Building and Improvements		3,457,953
Costs Capitalized Subsequent to Acquisition		649,141
Gross Amount at Which Carried at Close of Period, Land	[1]	661,335
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,143,532
Total		4,804,867	[2]	$ 4,807,718	$ 4,958,179	$ 5,129,933
Accumulated depreciation		1,332,073	[3]	$ 1,464,482	$ 1,414,305	$ 1,400,988
Real Estate Aggregate Cost, Tax Purpose		$ 3,100,000
100 Avenue At Port Imperial [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2016
Acquired		2016
Initial Costs, Land		$ 350
Costs Capitalized Subsequent to Acquisition		4,185
Gross Amount at Which Carried at Close of Period, Land	[1]	471
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,064
Total	[2]	4,535
Accumulated depreciation	[3]	$ 60
Office [Member] | One Bridge Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		1996
Initial Costs, Land		$ 2,439
Initial Costs, Building and Improvements		24,462
Costs Capitalized Subsequent to Acquisition		7,283
Gross Amount at Which Carried at Close of Period, Land	[1]	2,439
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	31,745
Total	[2]	34,184
Accumulated depreciation	[3]	$ 15,881
Office [Member] | 2115 Linwood Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		1998
Initial Costs, Land		$ 474
Initial Costs, Building and Improvements		4,419
Costs Capitalized Subsequent to Acquisition		7,503
Gross Amount at Which Carried at Close of Period, Land	[1]	474
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	11,922
Total	[2]	12,396
Accumulated depreciation	[3]	$ 4,518
Office [Member] | 135 Chestnut Ridge Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		1997
Initial Costs, Land		$ 2,587
Initial Costs, Building and Improvements		10,350
Costs Capitalized Subsequent to Acquisition		(4,659)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,437
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,841
Total	[2]	8,278
Accumulated depreciation	[3]	$ 4,536
Office [Member] | 15 East Midland Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1997
Initial Costs, Land		$ 10,375
Initial Costs, Building and Improvements		41,497
Costs Capitalized Subsequent to Acquisition		2,508
Gross Amount at Which Carried at Close of Period, Land	[1]	10,374
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	44,006
Total	[2]	54,380
Accumulated depreciation	[3]	$ 21,052
Office [Member] | 140 East Ridgewood Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		1997
Initial Costs, Land		$ 7,932
Initial Costs, Building and Improvements		31,463
Costs Capitalized Subsequent to Acquisition		8,171
Gross Amount at Which Carried at Close of Period, Land	[1]	7,932
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	39,634
Total	[2]	47,566
Accumulated depreciation	[3]	$ 19,260
Office [Member] | 461 From Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1997
Initial Costs, Land		$ 13,194
Initial Costs, Building and Improvements		52,778
Costs Capitalized Subsequent to Acquisition		11,533
Gross Amount at Which Carried at Close of Period, Land	[1]	13,194
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	64,311
Total	[2]	77,505
Accumulated depreciation	[3]	$ 26,938
Office [Member] | 650 From Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1978
Acquired		1997
Initial Costs, Land		$ 10,487
Initial Costs, Building and Improvements		41,949
Costs Capitalized Subsequent to Acquisition		8,209
Gross Amount at Which Carried at Close of Period, Land	[1]	10,487
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	50,158
Total	[2]	60,645
Accumulated depreciation	[3]	$ 24,199
Office [Member] | 61 South Paramus Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1985
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 9,005
Initial Costs, Building and Improvements	[4]	36,018
Costs Capitalized Subsequent to Acquisition	[4]	10,595
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	9,005
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	46,613
Total	[2],[4]	55,618
Accumulated depreciation	[3],[4]	$ 21,611
Office [Member] | 365 West Passaic Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1976
Acquired		1997
Initial Costs, Land		$ 4,148
Initial Costs, Building and Improvements		16,592
Costs Capitalized Subsequent to Acquisition		5,043
Gross Amount at Which Carried at Close of Period, Land	[1]	4,148
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	21,635
Total	[2]	25,783
Accumulated depreciation	[3]	$ 10,029
Office [Member] | 395 West Passaic Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1979
Acquired		2006
Initial Costs, Land		$ 2,550
Initial Costs, Building and Improvements		17,131
Costs Capitalized Subsequent to Acquisition		1,315
Gross Amount at Which Carried at Close of Period, Land	[1]	2,550
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	18,446
Total	[2]	20,996
Accumulated depreciation	[3]	$ 4,967
Office [Member] | 1 Lake Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1994
Acquired		1997
Initial Costs, Land		$ 13,952
Initial Costs, Building and Improvements		55,812
Costs Capitalized Subsequent to Acquisition		(36,310)
Gross Amount at Which Carried at Close of Period, Land	[1]	6,268
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	27,186
Total	[2]	33,454
Accumulated depreciation	[3]	$ 21,472
Office [Member] | 400 Chestnut Ridge Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1982
Acquired		1997
Initial Costs, Land		$ 4,201
Initial Costs, Building and Improvements		16,802
Costs Capitalized Subsequent to Acquisition		(9,243)
Gross Amount at Which Carried at Close of Period, Land	[1]	2,312
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,448
Total	[2]	11,760
Accumulated depreciation	[3]	$ 4,210
Office [Member] | 50 Tice Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1994
Initial Costs, Land		$ 4,500
Costs Capitalized Subsequent to Acquisition		27,735
Gross Amount at Which Carried at Close of Period, Land	[1]	4,500
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	27,735
Total	[2]	32,235
Accumulated depreciation	[3]	$ 20,159
Office [Member] | 300 Tice Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		1996
Initial Costs, Land		$ 5,424
Initial Costs, Building and Improvements		29,688
Costs Capitalized Subsequent to Acquisition		6,641
Gross Amount at Which Carried at Close of Period, Land	[1]	5,424
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	36,329
Total	[2]	41,753
Accumulated depreciation	[3]	$ 17,560
Office [Member] | 150 J.F. Kennedy Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Acquired		1997
Initial Costs, Land		$ 12,606
Initial Costs, Building and Improvements		50,425
Costs Capitalized Subsequent to Acquisition		13,879
Gross Amount at Which Carried at Close of Period, Land	[1]	12,606
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	64,304
Total	[2]	76,910
Accumulated depreciation	[3]	$ 28,231
Office [Member] | 6 Becker Farm Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2009
Initial Costs, Land		$ 2,600
Initial Costs, Building and Improvements		15,548
Costs Capitalized Subsequent to Acquisition		(7,057)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,556
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,535
Total	[2]	11,091
Accumulated depreciation	[3]	$ 4,877
Office [Member] | 75 Livingston Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		2009
Initial Costs, Land		$ 1,900
Initial Costs, Building and Improvements		6,312
Costs Capitalized Subsequent to Acquisition		(1,890)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,281
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,041
Total	[2]	6,322
Accumulated depreciation	[3]	$ 1,098
Office [Member] | 85 Livingston Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		2009
Initial Costs, Land		$ 2,500
Initial Costs, Building and Improvements		14,238
Costs Capitalized Subsequent to Acquisition		(8,799)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,234
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,705
Total	[2]	7,939
Accumulated depreciation	[3]	$ 3,189
Office [Member] | 111 River Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2002
Acquired		2016
Initial Costs, Land		$ 204
Initial Costs, Building and Improvements		198,609
Costs Capitalized Subsequent to Acquisition		10,671
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	209,484
Total	[2]	209,484
Accumulated depreciation	[3]	$ 2,766
Office [Member] | Harborside Plaza 1 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		1996
Initial Costs, Land		$ 3,923
Initial Costs, Building and Improvements		51,013
Costs Capitalized Subsequent to Acquisition		28,059
Gross Amount at Which Carried at Close of Period, Land	[1]	3,923
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	79,072
Total	[2]	82,995
Accumulated depreciation	[3]	$ 42,198
Office [Member] | Harborside Plaza 2 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1996
Initial Costs, Land		$ 17,655
Initial Costs, Building and Improvements		101,546
Costs Capitalized Subsequent to Acquisition		27,549
Gross Amount at Which Carried at Close of Period, Land	[1]	8,364
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	138,386
Total	[2]	146,750
Accumulated depreciation	[3]	$ 60,054
Office [Member] | Harborside Plaza 3 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1996
Initial Costs, Land		$ 17,655
Initial Costs, Building and Improvements		101,878
Costs Capitalized Subsequent to Acquisition		27,216
Gross Amount at Which Carried at Close of Period, Land	[1]	8,363
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	138,386
Total	[2]	146,749
Accumulated depreciation	[3]	$ 60,054
Office [Member] | Harborside Plaza 4A [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2000
Acquired		2000
Initial Costs, Land		$ 1,244
Initial Costs, Building and Improvements		56,144
Costs Capitalized Subsequent to Acquisition		8,297
Gross Amount at Which Carried at Close of Period, Land	[1]	1,244
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	64,441
Total	[2]	65,685
Accumulated depreciation	[3]	$ 26,763
Office [Member] | Harborside Plaza 5 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2002
Acquired		2002
Related Encumbrances		$ 213,470
Initial Costs, Land		6,218
Initial Costs, Building and Improvements		170,682
Costs Capitalized Subsequent to Acquisition		61,152
Gross Amount at Which Carried at Close of Period, Land	[1]	5,705
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	232,347
Total	[2]	238,052
Accumulated depreciation	[3]	$ 91,896
Office [Member] | 101 Hudson Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1992
Acquired		2005
Related Encumbrances		$ 248,062
Initial Costs, Land		45,530
Initial Costs, Building and Improvements		271,376
Costs Capitalized Subsequent to Acquisition		17,279
Gross Amount at Which Carried at Close of Period, Land	[1]	45,530
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	288,655
Total	[2]	334,185
Accumulated depreciation	[3]	$ 84,447
Office [Member] | 3 AAA Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		2007
Initial Costs, Land		$ 242
Initial Costs, Building and Improvements		3,218
Costs Capitalized Subsequent to Acquisition		1,106
Gross Amount at Which Carried at Close of Period, Land	[1]	242
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,324
Total	[2]	4,566
Accumulated depreciation	[3]	$ 1,223
Office [Member] | 700 Horizon Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2007
Acquired		2007
Initial Costs, Land		$ 490
Initial Costs, Building and Improvements		43
Costs Capitalized Subsequent to Acquisition		16,663
Gross Amount at Which Carried at Close of Period, Land	[1]	865
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	16,331
Total	[2]	17,196
Accumulated depreciation	[3]	$ 4,537
Office [Member] | 2 South Gold Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1974
Acquired		2007
Initial Costs, Land		$ 476
Initial Costs, Building and Improvements		3,487
Costs Capitalized Subsequent to Acquisition		853
Gross Amount at Which Carried at Close of Period, Land	[1]	476
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,340
Total	[2]	4,816
Accumulated depreciation	[3]	$ 1,121
Office [Member] | 103 Carnegie Center [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1996
Initial Costs, Land		$ 2,566
Initial Costs, Building and Improvements		7,868
Costs Capitalized Subsequent to Acquisition		3,250
Gross Amount at Which Carried at Close of Period, Land	[1]	2,566
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	11,118
Total	[2]	13,684
Accumulated depreciation	[3]	$ 5,798
Office [Member] | 100 Overlook Center [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1997
Initial Costs, Land		$ 2,378
Initial Costs, Building and Improvements		21,754
Costs Capitalized Subsequent to Acquisition		3,665
Gross Amount at Which Carried at Close of Period, Land	[1]	2,378
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	25,419
Total	[2]	27,797
Accumulated depreciation	[3]	$ 12,017
Office [Member] | 5 Vaughn Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1995
Initial Costs, Land		$ 657
Initial Costs, Building and Improvements		9,800
Costs Capitalized Subsequent to Acquisition		1,906
Gross Amount at Which Carried at Close of Period, Land	[1]	657
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	11,706
Total	[2]	12,363
Accumulated depreciation	[3]	$ 6,113
Office [Member] | 377 Summerhill Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1977
Acquired		1997
Initial Costs, Land		$ 649
Initial Costs, Building and Improvements		2,594
Costs Capitalized Subsequent to Acquisition		324
Gross Amount at Which Carried at Close of Period, Land	[1]	649
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,918
Total	[2]	3,567
Accumulated depreciation	[3]	$ 1,431
Office [Member] | 333 Thornall Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		2015
Initial Costs, Land		$ 5,542
Initial Costs, Building and Improvements		40,762
Costs Capitalized Subsequent to Acquisition		1,411
Gross Amount at Which Carried at Close of Period, Land	[1]	5,542
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	42,173
Total	[2]	47,715
Accumulated depreciation	[3]	$ 1,776
Office [Member] | 343 Thornall Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		2006
Initial Costs, Land		$ 6,027
Initial Costs, Building and Improvements		39,101
Costs Capitalized Subsequent to Acquisition		6,658
Gross Amount at Which Carried at Close of Period, Land	[1]	6,027
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	45,759
Total	[2]	51,786
Accumulated depreciation	[3]	$ 13,332
Office [Member] | 101 Wood Avenue South [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		2016
Initial Costs, Land		$ 8,509
Initial Costs, Building and Improvements		72,738
Costs Capitalized Subsequent to Acquisition		442
Gross Amount at Which Carried at Close of Period, Land	[1]	7,384
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	74,305
Total	[2]	81,689
Accumulated depreciation	[3]	$ 1,605
Office [Member] | 320 University Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2001
Acquired		2016
Initial Costs, Land		$ 1,468
Initial Costs, Building and Improvements		6,253
Costs Capitalized Subsequent to Acquisition		24
Gross Amount at Which Carried at Close of Period, Land	[1]	1,468
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,277
Total	[2]	7,745
Accumulated depreciation	[3]	$ 117
Office [Member] | 321 University Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2003
Acquired		2016
Initial Costs, Land		$ 5,837
Initial Costs, Building and Improvements		9,442
Costs Capitalized Subsequent to Acquisition		32
Gross Amount at Which Carried at Close of Period, Land	[1]	2,217
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	13,094
Total	[2]	15,311
Accumulated depreciation	[3]	$ 448
Office [Member] | 500 College Road East [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1984
Acquired	[4]	1998
Initial Costs, Land	[4]	$ 614
Initial Costs, Building and Improvements	[4]	20,626
Costs Capitalized Subsequent to Acquisition	[4]	4,982
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	614
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	25,608
Total	[2],[4]	26,222
Accumulated depreciation	[3],[4]	$ 12,194
Office [Member] | 581 Main Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		1997
Initial Costs, Land		$ 3,237
Initial Costs, Building and Improvements		12,949
Costs Capitalized Subsequent to Acquisition		26,538
Gross Amount at Which Carried at Close of Period, Land	[1]	8,115
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	34,609
Total	[2]	42,724
Accumulated depreciation	[3]	$ 18,120
Office [Member] | 23 Main Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1977
Acquired		2005
Related Encumbrances		$ 27,809
Initial Costs, Land		4,336
Initial Costs, Building and Improvements		19,544
Costs Capitalized Subsequent to Acquisition		11,894
Gross Amount at Which Carried at Close of Period, Land	[1]	4,336
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	31,438
Total	[2]	35,774
Accumulated depreciation	[3]	$ 14,037
Office [Member] | One River Center, Building 1 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2004
Related Encumbrances		$ 10,538
Initial Costs, Land		3,070
Initial Costs, Building and Improvements		17,414
Costs Capitalized Subsequent to Acquisition		4,279
Gross Amount at Which Carried at Close of Period, Land	[1]	2,451
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	22,312
Total	[2]	24,763
Accumulated depreciation	[3]	$ 8,292
Office [Member] | One River Center, Building 2 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2004
Related Encumbrances		$ 11,822
Initial Costs, Land		2,468
Initial Costs, Building and Improvements		15,043
Costs Capitalized Subsequent to Acquisition		3,989
Gross Amount at Which Carried at Close of Period, Land	[1]	2,452
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	19,048
Total	[2]	21,500
Accumulated depreciation	[3]	$ 6,252
Office [Member] | One River Center, Building 3 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		2004
Related Encumbrances		$ 18,786
Initial Costs, Land		4,051
Initial Costs, Building and Improvements		24,790
Costs Capitalized Subsequent to Acquisition		5,671
Gross Amount at Which Carried at Close of Period, Land	[1]	4,627
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	29,885
Total	[2]	34,512
Accumulated depreciation	[3]	$ 9,652
Office [Member] | 3600 Route 66 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1995
Initial Costs, Land		$ 1,098
Initial Costs, Building and Improvements		18,146
Costs Capitalized Subsequent to Acquisition		11,471
Gross Amount at Which Carried at Close of Period, Land	[1]	1,098
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	29,617
Total	[2]	30,715
Accumulated depreciation	[3]	$ 12,818
Office [Member] | 1305 Campus Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1995
Initial Costs, Land		$ 335
Initial Costs, Building and Improvements		2,560
Costs Capitalized Subsequent to Acquisition		591
Gross Amount at Which Carried at Close of Period, Land	[1]	291
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,195
Total	[2]	3,486
Accumulated depreciation	[3]	$ 1,602
Office [Member] | 1350 Campus Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1995
Initial Costs, Land		$ 454
Initial Costs, Building and Improvements		7,134
Costs Capitalized Subsequent to Acquisition		1,211
Gross Amount at Which Carried at Close of Period, Land	[1]	454
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,345
Total	[2]	8,799
Accumulated depreciation	[3]	$ 4,251
Office [Member] | 325 Columbia Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1994
Initial Costs, Land		$ 1,564
Costs Capitalized Subsequent to Acquisition		18,070
Gross Amount at Which Carried at Close of Period, Land	[1]	1,564
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	18,070
Total	[2]	19,634
Accumulated depreciation	[3]	$ 11,783
Office [Member] | 201 Littleton Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1979
Acquired		1997
Initial Costs, Land		$ 2,407
Initial Costs, Building and Improvements		9,627
Costs Capitalized Subsequent to Acquisition		3,332
Gross Amount at Which Carried at Close of Period, Land	[1]	2,407
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	12,959
Total	[2]	15,366
Accumulated depreciation	[3]	$ 6,134
Office [Member] | 4 Campus Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2001
Initial Costs, Land		$ 5,213
Initial Costs, Building and Improvements		20,984
Costs Capitalized Subsequent to Acquisition		4,072
Gross Amount at Which Carried at Close of Period, Land	[1]	5,213
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	25,056
Total	[2]	30,269
Accumulated depreciation	[3]	$ 9,767
Office [Member] | 6 Campus Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2001
Initial Costs, Land		$ 4,411
Initial Costs, Building and Improvements		17,796
Costs Capitalized Subsequent to Acquisition		3,458
Gross Amount at Which Carried at Close of Period, Land	[1]	4,411
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	21,254
Total	[2]	25,665
Accumulated depreciation	[3]	$ 8,532
Office [Member] | 7 Campus Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1982
Acquired		1998
Initial Costs, Land		$ 1,932
Initial Costs, Building and Improvements		27,788
Costs Capitalized Subsequent to Acquisition		7,464
Gross Amount at Which Carried at Close of Period, Land	[1]	1,932
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	35,252
Total	[2]	37,184
Accumulated depreciation	[3]	$ 16,937
Office [Member] | 8 Campus Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1998
Initial Costs, Land		$ 1,865
Initial Costs, Building and Improvements		35,456
Costs Capitalized Subsequent to Acquisition		6,182
Gross Amount at Which Carried at Close of Period, Land	[1]	1,865
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	41,638
Total	[2]	43,503
Accumulated depreciation	[3]	$ 18,624
Office [Member] | 9 Campus Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2001
Initial Costs, Land		$ 3,277
Initial Costs, Building and Improvements		11,796
Costs Capitalized Subsequent to Acquisition		22,610
Gross Amount at Which Carried at Close of Period, Land	[1]	5,842
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	31,841
Total	[2]	37,683
Accumulated depreciation	[3]	$ 11,223
Office [Member] | 2 Dryden Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1998
Initial Costs, Land		$ 778
Initial Costs, Building and Improvements		420
Costs Capitalized Subsequent to Acquisition		110
Gross Amount at Which Carried at Close of Period, Land	[1]	778
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	530
Total	[2]	1,308
Accumulated depreciation	[3]	$ 283
Office [Member] | 4 Gatehall Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2000
Initial Costs, Land		$ 8,452
Initial Costs, Building and Improvements		33,929
Costs Capitalized Subsequent to Acquisition		4,315
Gross Amount at Which Carried at Close of Period, Land	[1]	8,452
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	38,244
Total	[2]	46,696
Accumulated depreciation	[3]	$ 16,518
Office [Member] | 2 Hilton Court [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		1998
Initial Costs, Land		$ 1,971
Initial Costs, Building and Improvements		32,007
Costs Capitalized Subsequent to Acquisition		4,474
Gross Amount at Which Carried at Close of Period, Land	[1]	1,971
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	36,481
Total	[2]	38,452
Accumulated depreciation	[3]	$ 17,756
Office [Member] | 1633 Littleton Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1978
Acquired		2002
Initial Costs, Land		$ 2,283
Initial Costs, Building and Improvements		9,550
Costs Capitalized Subsequent to Acquisition		507
Gross Amount at Which Carried at Close of Period, Land	[1]	2,355
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,985
Total	[2]	12,340
Accumulated depreciation	[3]	$ 9,641
Office [Member] | 1 Sylvan Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1998
Initial Costs, Land		$ 1,689
Initial Costs, Building and Improvements		24,699
Costs Capitalized Subsequent to Acquisition		2,593
Gross Amount at Which Carried at Close of Period, Land	[1]	1,021
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	27,960
Total	[2]	28,981
Accumulated depreciation	[3]	$ 14,312
Office [Member] | 3 Sylvan Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2015
Initial Costs, Land		$ 5,590
Initial Costs, Building and Improvements		4,710
Costs Capitalized Subsequent to Acquisition		238
Gross Amount at Which Carried at Close of Period, Land	[1]	5,590
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,948
Total	[2]	10,538
Accumulated depreciation	[3]	$ 118
Office [Member] | 5 Sylvan Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1998
Initial Costs, Land		$ 1,160
Initial Costs, Building and Improvements		25,214
Costs Capitalized Subsequent to Acquisition		3,244
Gross Amount at Which Carried at Close of Period, Land	[1]	1,161
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	28,457
Total	[2]	29,618
Accumulated depreciation	[3]	$ 13,007
Office [Member] | 7 Sylvan Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1998
Initial Costs, Land		$ 2,084
Initial Costs, Building and Improvements		26,083
Costs Capitalized Subsequent to Acquisition		6,800
Gross Amount at Which Carried at Close of Period, Land	[1]	2,084
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	32,883
Total	[2]	34,967
Accumulated depreciation	[3]	$ 12,607
Office [Member] | 20 Waterview Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2009
Initial Costs, Land		$ 4,500
Initial Costs, Building and Improvements		27,246
Costs Capitalized Subsequent to Acquisition		(4,354)
Gross Amount at Which Carried at Close of Period, Land	[1]	3,816
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	23,576
Total	[2]	27,392
Accumulated depreciation	[3]	$ 5,472
Office [Member] | 35 Waterview Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		2006
Initial Costs, Land		$ 5,133
Initial Costs, Building and Improvements		28,059
Costs Capitalized Subsequent to Acquisition		1,145
Gross Amount at Which Carried at Close of Period, Land	[1]	5,133
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	29,204
Total	[2]	34,337
Accumulated depreciation	[3]	$ 9,026
Office [Member] | 5 Wood Hollow Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1979
Acquired		2004
Initial Costs, Land		$ 5,302
Initial Costs, Building and Improvements		26,488
Costs Capitalized Subsequent to Acquisition		20,070
Gross Amount at Which Carried at Close of Period, Land	[1]	5,302
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	46,558
Total	[2]	51,860
Accumulated depreciation	[3]	$ 17,314
Office [Member] | 999 Riverview Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1995
Initial Costs, Land		$ 476
Initial Costs, Building and Improvements		6,024
Costs Capitalized Subsequent to Acquisition		2,139
Gross Amount at Which Carried at Close of Period, Land	[1]	1,102
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,537
Total	[2]	8,639
Accumulated depreciation	[3]	$ 3,952
Office [Member] | 440 Route 22 East [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		2010
Initial Costs, Land		$ 3,986
Initial Costs, Building and Improvements		13,658
Costs Capitalized Subsequent to Acquisition		$ (17,644)
Office [Member] | 721 Route 202/206 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1997
Initial Costs, Land		$ 6,730
Initial Costs, Building and Improvements		26,919
Costs Capitalized Subsequent to Acquisition		(4,831)
Gross Amount at Which Carried at Close of Period, Land	[1]	5,067
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	23,751
Total	[2]	28,818
Accumulated depreciation	[3]	$ 11,944
Office [Member] | 890 Mountain Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1977
Acquired		1997
Initial Costs, Land		$ 2,796
Initial Costs, Building and Improvements		11,185
Costs Capitalized Subsequent to Acquisition		(4,842)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,719
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,420
Total	[2]	9,139
Accumulated depreciation	[3]	$ 3,196
Office [Member] | 100 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1975
Acquired		1997
Initial Costs, Land		$ 220
Initial Costs, Building and Improvements		5,366
Costs Capitalized Subsequent to Acquisition		1,793
Gross Amount at Which Carried at Close of Period, Land	[1]	220
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,159
Total	[2]	7,379
Accumulated depreciation	[3]	$ 3,551
Office [Member] | 101 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1971
Acquired		1997
Initial Costs, Land		$ 267
Initial Costs, Building and Improvements		5,838
Costs Capitalized Subsequent to Acquisition		(5,542)
Gross Amount at Which Carried at Close of Period, Land	[1]	101
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	462
Total	[2]	563
Accumulated depreciation	[3]	$ 3
Office [Member] | 1 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Acquired		1997
Initial Costs, Land		$ 66
Initial Costs, Building and Improvements		1,711
Costs Capitalized Subsequent to Acquisition		210
Gross Amount at Which Carried at Close of Period, Land	[1]	66
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,921
Total	[2]	1,987
Accumulated depreciation	[3]	$ 996
Office [Member] | 2 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 109
Initial Costs, Building and Improvements		3,128
Costs Capitalized Subsequent to Acquisition		1,474
Gross Amount at Which Carried at Close of Period, Land	[1]	109
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,602
Total	[2]	4,711
Accumulated depreciation	[3]	$ 2,483
Office [Member] | 7 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1998
Initial Costs, Land		$ 330
Initial Costs, Building and Improvements		13,013
Costs Capitalized Subsequent to Acquisition		2,850
Gross Amount at Which Carried at Close of Period, Land	[1]	330
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	15,863
Total	[2]	16,193
Accumulated depreciation	[3]	$ 7,258
Office [Member] | 17 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1989
Acquired	[4]	1997
Initial Costs, Building and Improvements	[4]	$ 7,269
Costs Capitalized Subsequent to Acquisition	[4]	1,484
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	8,753
Total	[2],[4]	8,753
Accumulated depreciation	[3],[4]	$ 4,269
Office [Member] | 1 Barker Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1975
Acquired		1997
Initial Costs, Land		$ 208
Initial Costs, Building and Improvements		9,629
Costs Capitalized Subsequent to Acquisition		3,001
Gross Amount at Which Carried at Close of Period, Land	[1]	207
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	12,631
Total	[2]	12,838
Accumulated depreciation	[3]	$ 5,919
Office [Member] | 3 Barker Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		1997
Initial Costs, Land		$ 122
Initial Costs, Building and Improvements		7,864
Costs Capitalized Subsequent to Acquisition		1,930
Gross Amount at Which Carried at Close of Period, Land	[1]	122
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,794
Total	[2]	9,916
Accumulated depreciation	[3]	$ 4,769
Office [Member] | 50 Main Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		1997
Initial Costs, Land		$ 564
Initial Costs, Building and Improvements		48,105
Costs Capitalized Subsequent to Acquisition		15,530
Gross Amount at Which Carried at Close of Period, Land	[1]	564
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	63,635
Total	[2]	64,199
Accumulated depreciation	[3]	$ 30,051
Office [Member] | 11 Martine Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 2,587
Initial Costs, Building and Improvements		35,123
Costs Capitalized Subsequent to Acquisition		9,594
Gross Amount at Which Carried at Close of Period, Land	[1]	2,587
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	44,717
Total	[2]	47,304
Accumulated depreciation	[3]	$ 17,133
Office [Member] | 1 Water Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1979
Acquired		1997
Initial Costs, Land		$ 211
Initial Costs, Building and Improvements		5,382
Costs Capitalized Subsequent to Acquisition		1,273
Gross Amount at Which Carried at Close of Period, Land	[1]	211
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,655
Total	[2]	6,866
Accumulated depreciation	[3]	$ 4,352
Office [Member] | 1 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1982
Acquired		1997
Initial Costs, Land		$ 1,104
Initial Costs, Building and Improvements		11,904
Costs Capitalized Subsequent to Acquisition		3,719
Gross Amount at Which Carried at Close of Period, Land	[1]	1,105
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	15,622
Total	[2]	16,727
Accumulated depreciation	[3]	$ 7,269
Office [Member] | 3 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 385
Initial Costs, Building and Improvements		6,256
Costs Capitalized Subsequent to Acquisition		1,799
Gross Amount at Which Carried at Close of Period, Land	[1]	385
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,055
Total	[2]	8,440
Accumulated depreciation	[3]	$ 3,913
Office [Member] | 3 Odell Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		2003
Initial Costs, Land		$ 1,322
Initial Costs, Building and Improvements		4,777
Costs Capitalized Subsequent to Acquisition		2,332
Gross Amount at Which Carried at Close of Period, Land	[1]	1,322
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,109
Total	[2]	8,431
Accumulated depreciation	[3]	$ 3,498
Office And Office/Flex Buildings [Member] | 3 Terri Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		1998
Initial Costs, Land		$ 652
Initial Costs, Building and Improvements		3,433
Costs Capitalized Subsequent to Acquisition		1,517
Gross Amount at Which Carried at Close of Period, Land	[1]	658
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,944
Total	[2]	5,602
Accumulated depreciation	[3]	$ 2,281
Office And Office/Flex Buildings [Member] | 5 Terri Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1992
Acquired		1998
Initial Costs, Land		$ 564
Initial Costs, Building and Improvements		3,792
Costs Capitalized Subsequent to Acquisition		2,417
Gross Amount at Which Carried at Close of Period, Land	[1]	569
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,204
Total	[2]	6,773
Accumulated depreciation	[3]	$ 3,104
Office And Office/Flex Buildings [Member] | 2 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1999
Initial Costs, Land		$ 723
Initial Costs, Building and Improvements		2,893
Costs Capitalized Subsequent to Acquisition		615
Gross Amount at Which Carried at Close of Period, Land	[1]	723
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,508
Total	[2]	4,231
Accumulated depreciation	[3]	$ 1,571
Office And Office/Flex Buildings [Member] | 101 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1998
Initial Costs, Land		$ 422
Initial Costs, Building and Improvements		3,528
Costs Capitalized Subsequent to Acquisition		436
Gross Amount at Which Carried at Close of Period, Land	[1]	426
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,960
Total	[2]	4,386
Accumulated depreciation	[3]	$ 2,003
Office And Office/Flex Buildings [Member] | 102 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1999
Initial Costs, Land		$ 389
Initial Costs, Building and Improvements		1,554
Costs Capitalized Subsequent to Acquisition		543
Gross Amount at Which Carried at Close of Period, Land	[1]	389
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,097
Total	[2]	2,486
Accumulated depreciation	[3]	$ 820
Office And Office/Flex Buildings [Member] | 201 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1998
Initial Costs, Land		$ 254
Initial Costs, Building and Improvements		1,694
Costs Capitalized Subsequent to Acquisition		421
Gross Amount at Which Carried at Close of Period, Land	[1]	258
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,111
Total	[2]	2,369
Accumulated depreciation	[3]	$ 996
Office And Office/Flex Buildings [Member] | 202 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1999
Initial Costs, Land		$ 490
Initial Costs, Building and Improvements		1,963
Costs Capitalized Subsequent to Acquisition		462
Gross Amount at Which Carried at Close of Period, Land	[1]	490
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,425
Total	[2]	2,915
Accumulated depreciation	[3]	$ 989
Office And Office/Flex Buildings [Member] | 1 Executive Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1998
Initial Costs, Land		$ 226
Initial Costs, Building and Improvements		1,453
Costs Capitalized Subsequent to Acquisition		772
Gross Amount at Which Carried at Close of Period, Land	[1]	228
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,223
Total	[2]	2,451
Accumulated depreciation	[3]	$ 1,090
Office And Office/Flex Buildings [Member] | 2 Executive Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2000
Initial Costs, Land		$ 801
Initial Costs, Building and Improvements		3,206
Costs Capitalized Subsequent to Acquisition		1,157
Gross Amount at Which Carried at Close of Period, Land	[1]	801
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,363
Total	[2]	5,164
Accumulated depreciation	[3]	$ 1,742
Office And Office/Flex Buildings [Member] | 101 Executive Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1998
Initial Costs, Land		$ 241
Initial Costs, Building and Improvements		2,262
Costs Capitalized Subsequent to Acquisition		622
Gross Amount at Which Carried at Close of Period, Land	[1]	244
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,881
Total	[2]	3,125
Accumulated depreciation	[3]	$ 1,340
Office And Office/Flex Buildings [Member] | 102 Executive Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1998
Initial Costs, Land		$ 353
Initial Costs, Building and Improvements		3,607
Costs Capitalized Subsequent to Acquisition		420
Gross Amount at Which Carried at Close of Period, Land	[1]	357
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,023
Total	[2]	4,380
Accumulated depreciation	[3]	$ 1,923
Office And Office/Flex Buildings [Member] | 225 Executive Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1998
Initial Costs, Land		$ 323
Initial Costs, Building and Improvements		2,477
Costs Capitalized Subsequent to Acquisition		557
Gross Amount at Which Carried at Close of Period, Land	[1]	326
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,031
Total	[2]	3,357
Accumulated depreciation	[3]	$ 1,378
Office And Office/Flex Buildings [Member] | 97 Foster Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1982
Acquired		1998
Initial Costs, Land		$ 208
Initial Costs, Building and Improvements		1,382
Costs Capitalized Subsequent to Acquisition		266
Gross Amount at Which Carried at Close of Period, Land	[1]	211
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,645
Total	[2]	1,856
Accumulated depreciation	[3]	$ 815
Office And Office/Flex Buildings [Member] | 1507 Lancer Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Acquired		1998
Initial Costs, Land		$ 119
Initial Costs, Building and Improvements		1,106
Costs Capitalized Subsequent to Acquisition		209
Gross Amount at Which Carried at Close of Period, Land	[1]	120
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,314
Total	[2]	1,434
Accumulated depreciation	[3]	$ 664
Office And Office/Flex Buildings [Member] | 1245 North Church Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		2001
Initial Costs, Land		$ 691
Initial Costs, Building and Improvements		2,810
Costs Capitalized Subsequent to Acquisition		110
Gross Amount at Which Carried at Close of Period, Land	[1]	691
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,920
Total	[2]	3,611
Accumulated depreciation	[3]	$ 1,160
Office And Office/Flex Buildings [Member] | 1247 North Church Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		2001
Initial Costs, Land		$ 805
Initial Costs, Building and Improvements		3,269
Costs Capitalized Subsequent to Acquisition		361
Gross Amount at Which Carried at Close of Period, Land	[1]	805
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,630
Total	[2]	4,435
Accumulated depreciation	[3]	$ 1,439
Office And Office/Flex Buildings [Member] | 1256 North Church Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1998
Initial Costs, Land		$ 354
Initial Costs, Building and Improvements		3,098
Costs Capitalized Subsequent to Acquisition		658
Gross Amount at Which Carried at Close of Period, Land	[1]	357
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,753
Total	[2]	4,110
Accumulated depreciation	[3]	$ 1,815
Office And Office/Flex Buildings [Member] | 840 North Lenola Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Acquired		1998
Initial Costs, Land		$ 329
Initial Costs, Building and Improvements		2,366
Costs Capitalized Subsequent to Acquisition		422
Gross Amount at Which Carried at Close of Period, Land	[1]	333
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,784
Total	[2]	3,117
Accumulated depreciation	[3]	$ 1,228
Office And Office/Flex Buildings [Member] | 844 North Lenola Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Acquired		1998
Initial Costs, Land		$ 239
Initial Costs, Building and Improvements		1,714
Costs Capitalized Subsequent to Acquisition		231
Gross Amount at Which Carried at Close of Period, Land	[1]	241
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,943
Total	[2]	2,184
Accumulated depreciation	[3]	$ 959
Office And Office/Flex Buildings [Member] | 915 North Lenola Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		2000
Initial Costs, Land		$ 508
Initial Costs, Building and Improvements		2,034
Costs Capitalized Subsequent to Acquisition		29
Gross Amount at Which Carried at Close of Period, Land	[1]	508
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,063
Total	[2]	2,571
Accumulated depreciation	[3]	$ 851
Office And Office/Flex Buildings [Member] | 2 Twosome Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2000
Acquired		2001
Initial Costs, Land		$ 701
Initial Costs, Building and Improvements		2,807
Costs Capitalized Subsequent to Acquisition		276
Gross Amount at Which Carried at Close of Period, Land	[1]	701
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,083
Total	[2]	3,784
Accumulated depreciation	[3]	$ 1,229
Office And Office/Flex Buildings [Member] | 30 Twosome Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1997
Acquired		1998
Initial Costs, Land		$ 234
Initial Costs, Building and Improvements		1,954
Costs Capitalized Subsequent to Acquisition		510
Gross Amount at Which Carried at Close of Period, Land	[1]	236
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,462
Total	[2]	2,698
Accumulated depreciation	[3]	$ 1,349
Office And Office/Flex Buildings [Member] | 31 Twosome Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		2001
Initial Costs, Land		$ 815
Initial Costs, Building and Improvements		3,276
Costs Capitalized Subsequent to Acquisition		258
Gross Amount at Which Carried at Close of Period, Land	[1]	815
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,534
Total	[2]	4,349
Accumulated depreciation	[3]	$ 1,433
Office And Office/Flex Buildings [Member] | 40 Twosome Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1996
Acquired		1998
Initial Costs, Land		$ 297
Initial Costs, Building and Improvements		2,393
Costs Capitalized Subsequent to Acquisition		160
Gross Amount at Which Carried at Close of Period, Land	[1]	301
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,549
Total	[2]	2,850
Accumulated depreciation	[3]	$ 1,260
Office And Office/Flex Buildings [Member] | 41 Twosome Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		2001
Initial Costs, Land		$ 605
Initial Costs, Building and Improvements		2,459
Costs Capitalized Subsequent to Acquisition		214
Gross Amount at Which Carried at Close of Period, Land	[1]	605
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,673
Total	[2]	3,278
Accumulated depreciation	[3]	$ 1,114
Office And Office/Flex Buildings [Member] | 50 Twosome Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1997
Acquired		1998
Initial Costs, Land		$ 301
Initial Costs, Building and Improvements		2,330
Costs Capitalized Subsequent to Acquisition		441
Gross Amount at Which Carried at Close of Period, Land	[1]	304
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,768
Total	[2]	3,072
Accumulated depreciation	[3]	$ 1,180
Office And Office/Flex Buildings [Member] | 100 Horizon Center Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1995
Initial Costs, Land		$ 205
Initial Costs, Building and Improvements		1,676
Costs Capitalized Subsequent to Acquisition		732
Gross Amount at Which Carried at Close of Period, Land	[1]	327
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,286
Total	[2]	2,613
Accumulated depreciation	[3]	$ 1,124
Office And Office/Flex Buildings [Member] | 200 Horizon Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		1995
Initial Costs, Land		$ 205
Initial Costs, Building and Improvements		3,027
Costs Capitalized Subsequent to Acquisition		704
Gross Amount at Which Carried at Close of Period, Land	[1]	359
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,577
Total	[2]	3,936
Accumulated depreciation	[3]	$ 1,921
Office And Office/Flex Buildings [Member] | 300 Horizon Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1995
Initial Costs, Land		$ 379
Initial Costs, Building and Improvements		4,355
Costs Capitalized Subsequent to Acquisition		1,991
Gross Amount at Which Carried at Close of Period, Land	[1]	533
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,192
Total	[2]	6,725
Accumulated depreciation	[3]	$ 2,891
Office And Office/Flex Buildings [Member] | 500 Horizon Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1995
Initial Costs, Land		$ 379
Initial Costs, Building and Improvements		3,395
Costs Capitalized Subsequent to Acquisition		1,062
Gross Amount at Which Carried at Close of Period, Land	[1]	498
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,338
Total	[2]	4,836
Accumulated depreciation	[3]	$ 2,303
Office And Office/Flex Buildings [Member] | 600 Horizon Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2002
Acquired		2002
Initial Costs, Building and Improvements		$ 7,549
Costs Capitalized Subsequent to Acquisition		1,014
Gross Amount at Which Carried at Close of Period, Land	[1]	685
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,878
Total	[2]	8,563
Accumulated depreciation	[3]	$ 2,845
Office And Office/Flex Buildings [Member] | 1325 Campus Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1995
Initial Costs, Land		$ 270
Initial Costs, Building and Improvements		2,928
Costs Capitalized Subsequent to Acquisition		774
Gross Amount at Which Carried at Close of Period, Land	[1]	270
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,702
Total	[2]	3,972
Accumulated depreciation	[3]	$ 2,078
Office And Office/Flex Buildings [Member] | 1340 Campus Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1992
Acquired		1995
Initial Costs, Land		$ 489
Initial Costs, Building and Improvements		4,621
Costs Capitalized Subsequent to Acquisition		2,528
Gross Amount at Which Carried at Close of Period, Land	[1]	489
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,149
Total	[2]	7,638
Accumulated depreciation	[3]	$ 3,688
Office And Office/Flex Buildings [Member] | 1345 Campus Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Acquired		1997
Initial Costs, Land		$ 1,023
Initial Costs, Building and Improvements		5,703
Costs Capitalized Subsequent to Acquisition		1,208
Gross Amount at Which Carried at Close of Period, Land	[1]	1,024
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,910
Total	[2]	7,934
Accumulated depreciation	[3]	$ 3,440
Office And Office/Flex Buildings [Member] | 1433 Highway 34 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		1995
Initial Costs, Land		$ 889
Initial Costs, Building and Improvements		4,321
Costs Capitalized Subsequent to Acquisition		1,813
Gross Amount at Which Carried at Close of Period, Land	[1]	889
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,134
Total	[2]	7,023
Accumulated depreciation	[3]	$ 3,250
Office And Office/Flex Buildings [Member] | 1320 Wyckoff Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1995
Initial Costs, Land		$ 255
Initial Costs, Building and Improvements		1,285
Costs Capitalized Subsequent to Acquisition		315
Gross Amount at Which Carried at Close of Period, Land	[1]	216
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,639
Total	[2]	1,855
Accumulated depreciation	[3]	$ 955
Office And Office/Flex Buildings [Member] | 1324 Wyckoff Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1995
Initial Costs, Land		$ 230
Initial Costs, Building and Improvements		1,439
Costs Capitalized Subsequent to Acquisition		345
Gross Amount at Which Carried at Close of Period, Land	[1]	190
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,824
Total	[2]	2,014
Accumulated depreciation	[3]	$ 931
Office And Office/Flex Buildings [Member] | 1 Center Court [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1999
Acquired		1999
Initial Costs, Land		$ 270
Initial Costs, Building and Improvements		1,824
Costs Capitalized Subsequent to Acquisition		594
Gross Amount at Which Carried at Close of Period, Land	[1]	270
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,418
Total	[2]	2,688
Accumulated depreciation	[3]	$ 1,082
Office And Office/Flex Buildings [Member] | 2 Center Court [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		1998
Initial Costs, Land		$ 191
Costs Capitalized Subsequent to Acquisition		2,670
Gross Amount at Which Carried at Close of Period, Land	[1]	191
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,670
Total	[2]	2,861
Accumulated depreciation	[3]	$ 1,363
Office And Office/Flex Buildings [Member] | 11 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1995
Initial Costs, Land		$ 586
Initial Costs, Building and Improvements		2,986
Costs Capitalized Subsequent to Acquisition		1,000
Gross Amount at Which Carried at Close of Period, Land	[1]	586
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,986
Total	[2]	4,572
Accumulated depreciation	[3]	$ 2,250
Office And Office/Flex Buildings [Member] | 20 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1992
Acquired		1995
Initial Costs, Land		$ 516
Initial Costs, Building and Improvements		3,108
Costs Capitalized Subsequent to Acquisition		155
Gross Amount at Which Carried at Close of Period, Land	[1]	516
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,263
Total	[2]	3,779
Accumulated depreciation	[3]	$ 1,686
Office And Office/Flex Buildings [Member] | 29 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1995
Initial Costs, Land		$ 586
Initial Costs, Building and Improvements		3,092
Costs Capitalized Subsequent to Acquisition		961
Gross Amount at Which Carried at Close of Period, Land	[1]	586
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,053
Total	[2]	4,639
Accumulated depreciation	[3]	$ 1,978
Office And Office/Flex Buildings [Member] | 40 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1995
Initial Costs, Land		$ 516
Initial Costs, Building and Improvements		3,260
Costs Capitalized Subsequent to Acquisition		1,427
Gross Amount at Which Carried at Close of Period, Land	[1]	516
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,687
Total	[2]	5,203
Accumulated depreciation	[3]	$ 2,420
Office And Office/Flex Buildings [Member] | 45 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1992
Acquired		1995
Initial Costs, Land		$ 536
Initial Costs, Building and Improvements		3,379
Costs Capitalized Subsequent to Acquisition		584
Gross Amount at Which Carried at Close of Period, Land	[1]	536
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,963
Total	[2]	4,499
Accumulated depreciation	[3]	$ 1,981
Office And Office/Flex Buildings [Member] | 60 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1995
Initial Costs, Land		$ 526
Initial Costs, Building and Improvements		3,257
Costs Capitalized Subsequent to Acquisition		381
Gross Amount at Which Carried at Close of Period, Land	[1]	526
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,638
Total	[2]	4,164
Accumulated depreciation	[3]	$ 1,785
Office And Office/Flex Buildings [Member] | 80 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1996
Acquired		1996
Initial Costs, Land		$ 227
Costs Capitalized Subsequent to Acquisition		1,370
Gross Amount at Which Carried at Close of Period, Land	[1]	227
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,370
Total	[2]	1,597
Accumulated depreciation	[3]	$ 700
Office And Office/Flex Buildings [Member] | 100 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1996
Acquired		1996
Initial Costs, Land		$ 226
Costs Capitalized Subsequent to Acquisition		1,369
Gross Amount at Which Carried at Close of Period, Land	[1]	226
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,369
Total	[2]	1,595
Accumulated depreciation	[3]	$ 700
Office And Office/Flex Buildings [Member] | 120 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1994
Acquired		1995
Initial Costs, Land		$ 228
Costs Capitalized Subsequent to Acquisition		1,286
Gross Amount at Which Carried at Close of Period, Land	[1]	229
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,285
Total	[2]	1,514
Accumulated depreciation	[3]	$ 703
Office And Office/Flex Buildings [Member] | 140 Commerce Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1994
Acquired		1995
Initial Costs, Land		$ 229
Costs Capitalized Subsequent to Acquisition		1,284
Gross Amount at Which Carried at Close of Period, Land	[1]	228
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,285
Total	[2]	1,513
Accumulated depreciation	[3]	$ 703
Office And Office/Flex Buildings [Member] | 11 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1974
Acquired		1997
Initial Costs, Land		$ 149
Initial Costs, Building and Improvements		2,159
Costs Capitalized Subsequent to Acquisition		578
Gross Amount at Which Carried at Close of Period, Land	[1]	149
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,737
Total	[2]	2,886
Accumulated depreciation	[3]	$ 1,344
Office And Office/Flex Buildings [Member] | 75 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1997
Initial Costs, Land		$ 2,314
Initial Costs, Building and Improvements		4,716
Costs Capitalized Subsequent to Acquisition		57
Gross Amount at Which Carried at Close of Period, Land	[1]	2,314
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,773
Total	[2]	7,087
Accumulated depreciation	[3]	$ 2,380
Office And Office/Flex Buildings [Member] | 125 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2002
Acquired		2002
Initial Costs, Land		$ 1,055
Initial Costs, Building and Improvements		3,676
Costs Capitalized Subsequent to Acquisition		(339)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,055
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,337
Total	[2]	4,392
Accumulated depreciation	[3]	$ 1,301
Office And Office/Flex Buildings [Member] | 150 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1975
Acquired		1997
Initial Costs, Land		$ 497
Initial Costs, Building and Improvements		7,030
Costs Capitalized Subsequent to Acquisition		2,129
Gross Amount at Which Carried at Close of Period, Land	[1]	497
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,159
Total	[2]	9,656
Accumulated depreciation	[3]	$ 4,296
Office And Office/Flex Buildings [Member] | 175 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1973
Acquired		1997
Initial Costs, Land		$ 655
Initial Costs, Building and Improvements		7,473
Costs Capitalized Subsequent to Acquisition		961
Gross Amount at Which Carried at Close of Period, Land	[1]	655
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,434
Total	[2]	9,089
Accumulated depreciation	[3]	$ 4,155
Office And Office/Flex Buildings [Member] | 200 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1974
Acquired		1997
Initial Costs, Land		$ 579
Initial Costs, Building and Improvements		6,620
Costs Capitalized Subsequent to Acquisition		1,729
Gross Amount at Which Carried at Close of Period, Land	[1]	579
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,349
Total	[2]	8,928
Accumulated depreciation	[3]	$ 3,862
Office And Office/Flex Buildings [Member] | 250 Clearbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1973
Acquired		1997
Initial Costs, Land		$ 867
Initial Costs, Building and Improvements		8,647
Costs Capitalized Subsequent to Acquisition		2,466
Gross Amount at Which Carried at Close of Period, Land	[1]	867
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	11,113
Total	[2]	11,980
Accumulated depreciation	[3]	$ 5,130
Office And Office/Flex Buildings [Member] | 50 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1969
Acquired		1997
Initial Costs, Land		$ 237
Initial Costs, Building and Improvements		2,617
Costs Capitalized Subsequent to Acquisition		540
Gross Amount at Which Carried at Close of Period, Land	[1]	237
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,157
Total	[2]	3,394
Accumulated depreciation	[3]	$ 1,510
Office And Office/Flex Buildings [Member] | 77 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1977
Acquired		1997
Initial Costs, Land		$ 34
Initial Costs, Building and Improvements		1,104
Costs Capitalized Subsequent to Acquisition		177
Gross Amount at Which Carried at Close of Period, Land	[1]	34
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,281
Total	[2]	1,315
Accumulated depreciation	[3]	$ 651
Office And Office/Flex Buildings [Member] | 85 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1968
Acquired		1997
Initial Costs, Land		$ 155
Initial Costs, Building and Improvements		2,507
Costs Capitalized Subsequent to Acquisition		538
Gross Amount at Which Carried at Close of Period, Land	[1]	155
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,045
Total	[2]	3,200
Accumulated depreciation	[3]	$ 1,406
Office And Office/Flex Buildings [Member] | 300 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1970
Acquired		1997
Initial Costs, Land		$ 460
Initial Costs, Building and Improvements		3,609
Costs Capitalized Subsequent to Acquisition		306
Gross Amount at Which Carried at Close of Period, Land	[1]	460
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,915
Total	[2]	4,375
Accumulated depreciation	[3]	$ 1,922
Office And Office/Flex Buildings [Member] | 350 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1970
Acquired		1997
Initial Costs, Land		$ 100
Initial Costs, Building and Improvements		1,793
Costs Capitalized Subsequent to Acquisition		175
Gross Amount at Which Carried at Close of Period, Land	[1]	100
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,968
Total	[2]	2,068
Accumulated depreciation	[3]	$ 1,013
Office And Office/Flex Buildings [Member] | 399 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1962
Acquired		1997
Initial Costs, Land		$ 531
Initial Costs, Building and Improvements		7,191
Costs Capitalized Subsequent to Acquisition		163
Gross Amount at Which Carried at Close of Period, Land	[1]	531
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,354
Total	[2]	7,885
Accumulated depreciation	[3]	$ 3,693
Office And Office/Flex Buildings [Member] | 400 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1970
Acquired		1997
Initial Costs, Land		$ 2,202
Initial Costs, Building and Improvements		1,846
Costs Capitalized Subsequent to Acquisition		1,073
Gross Amount at Which Carried at Close of Period, Land	[1]	2,202
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,919
Total	[2]	5,121
Accumulated depreciation	[3]	$ 1,555
Office And Office/Flex Buildings [Member] | 500 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1970
Acquired		1997
Initial Costs, Land		$ 258
Initial Costs, Building and Improvements		4,183
Costs Capitalized Subsequent to Acquisition		434
Gross Amount at Which Carried at Close of Period, Land	[1]	258
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,617
Total	[2]	4,875
Accumulated depreciation	[3]	$ 2,418
Office And Office/Flex Buildings [Member] | 525 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1972
Acquired		1997
Initial Costs, Land		$ 345
Initial Costs, Building and Improvements		5,499
Costs Capitalized Subsequent to Acquisition		844
Gross Amount at Which Carried at Close of Period, Land	[1]	345
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,343
Total	[2]	6,688
Accumulated depreciation	[3]	$ 3,272
Office And Office/Flex Buildings [Member] | 1 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1967
Acquired		1997
Initial Costs, Land		$ 199
Initial Costs, Building and Improvements		2,023
Costs Capitalized Subsequent to Acquisition		472
Gross Amount at Which Carried at Close of Period, Land	[1]	199
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,495
Total	[2]	2,694
Accumulated depreciation	[3]	$ 1,416
Office And Office/Flex Buildings [Member] | 2 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1968
Acquired		1997
Initial Costs, Land		$ 234
Initial Costs, Building and Improvements		2,726
Costs Capitalized Subsequent to Acquisition		905
Gross Amount at Which Carried at Close of Period, Land	[1]	234
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,631
Total	[2]	3,865
Accumulated depreciation	[3]	$ 1,653
Office And Office/Flex Buildings [Member] | 3 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1969
Acquired		1997
Initial Costs, Land		$ 655
Initial Costs, Building and Improvements		7,936
Costs Capitalized Subsequent to Acquisition		1,764
Gross Amount at Which Carried at Close of Period, Land	[1]	655
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,700
Total	[2]	10,355
Accumulated depreciation	[3]	$ 4,719
Office And Office/Flex Buildings [Member] | 4 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1969
Acquired		1997
Initial Costs, Land		$ 320
Initial Costs, Building and Improvements		3,729
Costs Capitalized Subsequent to Acquisition		1,191
Gross Amount at Which Carried at Close of Period, Land	[1]	320
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,920
Total	[2]	5,240
Accumulated depreciation	[3]	$ 2,606
Office And Office/Flex Buildings [Member] | 5 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1969
Acquired		1997
Initial Costs, Land		$ 118
Initial Costs, Building and Improvements		1,949
Costs Capitalized Subsequent to Acquisition		304
Gross Amount at Which Carried at Close of Period, Land	[1]	118
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,253
Total	[2]	2,371
Accumulated depreciation	[3]	$ 1,161
Office And Office/Flex Buildings [Member] | 6 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1968
Acquired		1997
Initial Costs, Land		$ 164
Initial Costs, Building and Improvements		1,998
Costs Capitalized Subsequent to Acquisition		148
Gross Amount at Which Carried at Close of Period, Land	[1]	164
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,146
Total	[2]	2,310
Accumulated depreciation	[3]	$ 1,052
Office And Office/Flex Buildings [Member] | 7 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1972
Acquired		1997
Initial Costs, Land		$ 286
Initial Costs, Building and Improvements		4,321
Costs Capitalized Subsequent to Acquisition		1,116
Gross Amount at Which Carried at Close of Period, Land	[1]	286
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,437
Total	[2]	5,723
Accumulated depreciation	[3]	$ 2,369
Office And Office/Flex Buildings [Member] | 8 Westchester Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1971
Acquired		1997
Initial Costs, Land		$ 447
Initial Costs, Building and Improvements		5,262
Costs Capitalized Subsequent to Acquisition		2,122
Gross Amount at Which Carried at Close of Period, Land	[1]	447
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,384
Total	[2]	7,831
Accumulated depreciation	[3]	$ 3,420
Office And Office/Flex Buildings [Member] | 200 Saw Mill River Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1965
Acquired		1997
Initial Costs, Land		$ 353
Initial Costs, Building and Improvements		3,353
Costs Capitalized Subsequent to Acquisition		533
Gross Amount at Which Carried at Close of Period, Land	[1]	353
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,886
Total	[2]	4,239
Accumulated depreciation	[3]	$ 1,945
Office And Office/Flex Buildings [Member] | 4 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 363
Initial Costs, Building and Improvements		7,513
Costs Capitalized Subsequent to Acquisition		2,980
Gross Amount at Which Carried at Close of Period, Land	[1]	363
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	10,493
Total	[2]	10,856
Accumulated depreciation	[3]	$ 5,767
Office And Office/Flex Buildings [Member] | 5 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Acquired		2001
Initial Costs, Land		$ 2,219
Initial Costs, Building and Improvements		8,916
Costs Capitalized Subsequent to Acquisition		1,754
Gross Amount at Which Carried at Close of Period, Land	[1]	2,219
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	10,670
Total	[2]	12,889
Accumulated depreciation	[3]	$ 5,095
Office And Office/Flex Buildings [Member] | 6 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Acquired		2001
Initial Costs, Land		$ 740
Initial Costs, Building and Improvements		2,971
Costs Capitalized Subsequent to Acquisition		1,502
Gross Amount at Which Carried at Close of Period, Land	[1]	740
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,473
Total	[2]	5,213
Accumulated depreciation	[3]	$ 2,600
Office And Office/Flex Buildings [Member] | 8 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		1997
Initial Costs, Land		$ 212
Initial Costs, Building and Improvements		4,410
Costs Capitalized Subsequent to Acquisition		777
Gross Amount at Which Carried at Close of Period, Land	[1]	212
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,187
Total	[2]	5,399
Accumulated depreciation	[3]	$ 2,720
Office And Office/Flex Buildings [Member] | 10 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		1997
Initial Costs, Land		$ 134
Initial Costs, Building and Improvements		2,799
Costs Capitalized Subsequent to Acquisition		750
Gross Amount at Which Carried at Close of Period, Land	[1]	134
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,549
Total	[2]	3,683
Accumulated depreciation	[3]	$ 2,042
Office And Office/Flex Buildings [Member] | 11 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1989
Acquired	[4]	1997
Initial Costs, Building and Improvements	[4]	$ 4,788
Costs Capitalized Subsequent to Acquisition	[4]	763
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	5,551
Total	[2],[4]	5,551
Accumulated depreciation	[3],[4]	$ 2,575
Office And Office/Flex Buildings [Member] | 12 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1999
Acquired	[4]	1999
Initial Costs, Land	[4]	$ 1,562
Initial Costs, Building and Improvements	[4]	3,254
Costs Capitalized Subsequent to Acquisition	[4]	218
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	1,320
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	3,714
Total	[2],[4]	5,034
Accumulated depreciation	[3],[4]	$ 1,644
Office And Office/Flex Buildings [Member] | 15 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1989
Acquired	[4]	1997
Initial Costs, Building and Improvements	[4]	$ 7,449
Costs Capitalized Subsequent to Acquisition	[4]	1,749
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	9,198
Total	[2],[4]	9,198
Accumulated depreciation	[3],[4]	$ 3,906
Office And Office/Flex Buildings [Member] | 100 Corporate Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 602
Initial Costs, Building and Improvements		9,910
Costs Capitalized Subsequent to Acquisition		1,397
Gross Amount at Which Carried at Close of Period, Land	[1]	602
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	11,307
Total	[2]	11,909
Accumulated depreciation	[3]	$ 5,696
Office And Office/Flex Buildings [Member] | 200 Corporate Boulevard South [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1997
Initial Costs, Land		$ 502
Initial Costs, Building and Improvements		7,575
Costs Capitalized Subsequent to Acquisition		2,296
Gross Amount at Which Carried at Close of Period, Land	[1]	502
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,871
Total	[2]	10,373
Accumulated depreciation	[3]	$ 4,799
Office And Office/Flex Buildings [Member] | 4 Executive Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1997
Initial Costs, Land		$ 584
Initial Costs, Building and Improvements		6,134
Costs Capitalized Subsequent to Acquisition		1,142
Gross Amount at Which Carried at Close of Period, Land	[1]	584
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,276
Total	[2]	7,860
Accumulated depreciation	[3]	$ 3,565
Office And Office/Flex Buildings [Member] | 6 Executive Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 546
Initial Costs, Building and Improvements		7,246
Costs Capitalized Subsequent to Acquisition		2,331
Gross Amount at Which Carried at Close of Period, Land	[1]	546
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,577
Total	[2]	10,123
Accumulated depreciation	[3]	$ 4,561
Office And Office/Flex Buildings [Member] | 1 Odell Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Acquired		1997
Initial Costs, Land		$ 1,206
Initial Costs, Building and Improvements		6,815
Costs Capitalized Subsequent to Acquisition		2,284
Gross Amount at Which Carried at Close of Period, Land	[1]	1,206
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	9,099
Total	[2]	10,305
Accumulated depreciation	[3]	$ 4,403
Office And Office/Flex Buildings [Member] | 5 Odell Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		1997
Initial Costs, Land		$ 331
Initial Costs, Building and Improvements		2,988
Costs Capitalized Subsequent to Acquisition		535
Gross Amount at Which Carried at Close of Period, Land	[1]	331
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,523
Total	[2]	3,854
Accumulated depreciation	[3]	$ 1,878
Office And Office/Flex Buildings [Member] | 7 Odell Plaza [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1997
Initial Costs, Land		$ 419
Initial Costs, Building and Improvements		4,418
Costs Capitalized Subsequent to Acquisition		1,319
Gross Amount at Which Carried at Close of Period, Land	[1]	419
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,737
Total	[2]	6,156
Accumulated depreciation	[3]	$ 2,664
Office And Office/Flex Buildings [Member] | 419 West Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1997
Initial Costs, Land		$ 4,538
Initial Costs, Building and Improvements		9,246
Costs Capitalized Subsequent to Acquisition		1,452
Gross Amount at Which Carried at Close of Period, Land	[1]	4,538
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	10,698
Total	[2]	15,236
Accumulated depreciation	[3]	$ 5,773
Office And Office/Flex Buildings [Member] | 500 West Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1997
Initial Costs, Land		$ 415
Initial Costs, Building and Improvements		1,679
Costs Capitalized Subsequent to Acquisition		646
Gross Amount at Which Carried at Close of Period, Land	[1]	415
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,325
Total	[2]	2,740
Accumulated depreciation	[3]	$ 975
Office And Office/Flex Buildings [Member] | 550 West Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1997
Initial Costs, Land		$ 1,975
Initial Costs, Building and Improvements		3,856
Costs Capitalized Subsequent to Acquisition		133
Gross Amount at Which Carried at Close of Period, Land	[1]	1,975
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,989
Total	[2]	5,964
Accumulated depreciation	[3]	$ 1,960
Office And Office/Flex Buildings [Member] | 600 West Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1999
Acquired		1999
Initial Costs, Land		$ 2,305
Initial Costs, Building and Improvements		2,863
Costs Capitalized Subsequent to Acquisition		754
Gross Amount at Which Carried at Close of Period, Land	[1]	2,305
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,617
Total	[2]	5,922
Accumulated depreciation	[3]	$ 1,519
Office And Office/Flex Buildings [Member] | 650 West Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1998
Acquired		1998
Initial Costs, Land		$ 1,328
Costs Capitalized Subsequent to Acquisition		3,547
Gross Amount at Which Carried at Close of Period, Land	[1]	1,328
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,547
Total	[2]	4,875
Accumulated depreciation	[3]	$ 1,764
Industrial/Warehouse Facilities [Member] | 1 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1957
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 3
Initial Costs, Building and Improvements	[4]	268
Costs Capitalized Subsequent to Acquisition	[4]	233
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	3
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	501
Total	[2],[4]	504
Accumulated depreciation	[3],[4]	$ 253
Industrial/Warehouse Facilities [Member] | 2 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1957
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 4
Initial Costs, Building and Improvements	[4]	672
Costs Capitalized Subsequent to Acquisition	[4]	245
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	4
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	917
Total	[2],[4]	921
Accumulated depreciation	[3],[4]	$ 410
Industrial/Warehouse Facilities [Member] | 3 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1957
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 21
Initial Costs, Building and Improvements	[4]	1,948
Costs Capitalized Subsequent to Acquisition	[4]	363
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	21
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	2,311
Total	[2],[4]	2,332
Accumulated depreciation	[3],[4]	$ 1,247
Industrial/Warehouse Facilities [Member] | 4 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1957
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 84
Initial Costs, Building and Improvements	[4]	13,393
Costs Capitalized Subsequent to Acquisition	[4]	3,665
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	85
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	17,057
Total	[2],[4]	17,142
Accumulated depreciation	[3],[4]	$ 7,832
Industrial/Warehouse Facilities [Member] | 5 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1957
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 19
Initial Costs, Building and Improvements	[4]	4,804
Costs Capitalized Subsequent to Acquisition	[4]	943
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	19
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	5,747
Total	[2],[4]	5,766
Accumulated depreciation	[3],[4]	$ 2,930
Industrial/Warehouse Facilities [Member] | 6 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[4]	1982
Acquired	[4]	1997
Initial Costs, Land	[4]	$ 10
Initial Costs, Building and Improvements	[4]	4,419
Costs Capitalized Subsequent to Acquisition	[4]	2,381
Gross Amount at Which Carried at Close of Period, Land	[1],[4]	10
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[4]	6,800
Total	[2],[4]	6,810
Accumulated depreciation	[3],[4]	$ 3,006
Retail [Member] | 230 White Plains Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1997
Initial Costs, Land		$ 124
Initial Costs, Building and Improvements		1,845
Costs Capitalized Subsequent to Acquisition		288
Gross Amount at Which Carried at Close of Period, Land	[1]	124
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,133
Total	[2]	2,257
Accumulated depreciation	[3]	$ 982
Retail [Member] | 2 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1997
Initial Costs, Land		$ 89
Initial Costs, Building and Improvements		2,439
Costs Capitalized Subsequent to Acquisition		107
Gross Amount at Which Carried at Close of Period, Land	[1]	89
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,546
Total	[2]	2,635
Accumulated depreciation	[3]	$ 1,253
Multi-Family Properties [Member] | Richmond Court [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1997
Acquired		2013
Initial Costs, Land		$ 2,992
Initial Costs, Building and Improvements		13,534
Costs Capitalized Subsequent to Acquisition		2,103
Gross Amount at Which Carried at Close of Period, Land	[1]	2,992
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	15,637
Total	[2]	18,629
Accumulated depreciation	[3]	$ 1,038
Multi-Family Properties [Member] | Riverwatch Commons [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Acquired		2013
Initial Costs, Land		$ 4,169
Initial Costs, Building and Improvements		18,974
Costs Capitalized Subsequent to Acquisition		2,354
Gross Amount at Which Carried at Close of Period, Land	[1]	4,169
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	21,328
Total	[2]	25,497
Accumulated depreciation	[3]	$ 1,440
Multi-Family Properties [Member] | Park Square [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2011
Acquired		2013
Related Encumbrances		$ 27,426
Initial Costs, Land		4,000
Initial Costs, Building and Improvements		40,670
Costs Capitalized Subsequent to Acquisition		309
Gross Amount at Which Carried at Close of Period, Land	[1]	4,000
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	40,979
Total	[2]	44,979
Accumulated depreciation	[3]	$ 3,165
Multi-Family Properties [Member] | Quarry Place At Tuckahoe [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2016
Acquired		2016
Related Encumbrances		$ 26,642
Initial Costs, Land		5,585
Initial Costs, Building and Improvements		3,400
Costs Capitalized Subsequent to Acquisition		47,710
Gross Amount at Which Carried at Close of Period, Land	[1]	5,585
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	51,110
Total	[2]	56,695
Accumulated depreciation	[3]	$ 30
Multi-Family Properties [Member] | The Chase At Overlook Ridge [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2016
Acquired		2016
Related Encumbrances		$ 71,992
Initial Costs, Land		11,072
Initial Costs, Building and Improvements		87,793
Costs Capitalized Subsequent to Acquisition		9
Gross Amount at Which Carried at Close of Period, Land	[1]	11,072
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	87,802
Total	[2]	98,874
Accumulated depreciation	[3]	$ 2,188
Multi-Family Properties [Member] | Chase II At Overlook Ridge [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2016
Acquired		2016
Related Encumbrances		$ 34,366
Initial Costs, Land		10,755
Initial Costs, Building and Improvements		10,846
Costs Capitalized Subsequent to Acquisition		43,181
Gross Amount at Which Carried at Close of Period, Land	[1]	10,755
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	54,027
Total	[2]	64,782
Accumulated depreciation	[3]	$ 39
Multi-Family Properties [Member] | Portside At Pier One [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2016
Acquired		2016
Related Encumbrances		$ 58,505
Initial Costs, Building and Improvements		73,713
Costs Capitalized Subsequent to Acquisition		9
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	73,722
Total	[2]	73,722
Accumulated depreciation	[3]	$ 1,675
Multi-Family Properties [Member] | Alterra At Overlook Ridge IA [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2004
Acquired		2013
Initial Costs, Land		$ 9,042
Initial Costs, Building and Improvements		50,671
Costs Capitalized Subsequent to Acquisition		1,322
Gross Amount at Which Carried at Close of Period, Land	[1]	9,042
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	51,993
Total	[2]	61,035
Accumulated depreciation	[3]	$ 5,188
Multi-Family Properties [Member] | Alterra at Overlook Ridge II [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2008
Acquired		2013
Initial Costs, Land		$ 12,055
Initial Costs, Building and Improvements		71,409
Costs Capitalized Subsequent to Acquisition		485
Gross Amount at Which Carried at Close of Period, Land	[1]	12,055
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	71,894
Total	[2]	83,949
Accumulated depreciation	[3]	$ 7,144
Other Property [Member] | 500 Avenue At Port Imperial [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2013
Acquired		2013
Related Encumbrances		$ 36,228
Initial Costs, Land		13,099
Initial Costs, Building and Improvements		56,669
Costs Capitalized Subsequent to Acquisition		(20,587)
Gross Amount at Which Carried at Close of Period, Land	[1]	13,099
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	36,082
Total	[2]	49,181
Accumulated depreciation	[3]	3,066
Projects Under Development And Developable Land [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances		27,939
Initial Costs, Land		229,250
Initial Costs, Building and Improvements		308,623
Gross Amount at Which Carried at Close of Period, Land	[1]	229,250
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	308,623
Total	[2]	537,873
Accumulated depreciation	[3]	4,966
Furniture, Fixtures And Equipment [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Costs Capitalized Subsequent to Acquisition		21,230
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	21,230
Total	[2]	21,230
Accumulated depreciation	[3]	$ 7,186
Buildings And Improvements [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Useful Live		40 years
Land Lease [Member] | 700 Executive Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		1997
Initial Costs, Land		$ 970
Gross Amount at Which Carried at Close of Period, Land	[1]	970
Total	[2]	$ 970
Land Lease [Member] | 1 Enterprise Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		1997
Initial Costs, Land		$ 1,379
Costs Capitalized Subsequent to Acquisition		1
Gross Amount at Which Carried at Close of Period, Land	[1]	1,380
Total	[2]	$ 1,380
[1] The aggregate cost for federal income tax purposes at December 31, 2016 was approximately $3.1 billion. [2] Properties identified as held for sale at December 31, 2016 are excluded. [3] Depreciation of buildings and improvements are calculated over lives ranging from the life of the lease to 40 years. [4] This property is located on land leased by the Company.