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

v3.3.1.900

Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances		$ 667,076
Initial Costs, Land		796,691
Initial Costs, Building and Improvements		3,531,729
Costs Capitalized Subsequent to Acquisition		479,298
Gross Amount at Which Carried at Close of Period, Land	[1]	735,696
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,072,022
Total		4,807,718		$ 4,958,179	$ 5,129,933	$ 5,379,436
Accumulated depreciation		1,464,482	[2]	$ 1,414,305	$ 1,400,988	$ 1,478,214
Real Estate Aggregate Cost, Tax Purpose		$ 3,300,000
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		7,444
Gross Amount at Which Carried at Close of Period, Land	[3]	2,439
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	31,906
Total		34,345
Accumulated depreciation	[2]	$ 14,813
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		7,017
Gross Amount at Which Carried at Close of Period, Land	[3]	474
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	11,436
Total		11,910
Accumulated depreciation	[2]	$ 4,083
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	[3]	1,437
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	6,841
Total		8,278
Accumulated depreciation	[2]	$ 3,026
Office [Member] | 15 East Midland Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		1997
Related Encumbrances		$ 12,438
Initial Costs, Land		10,375
Initial Costs, Building and Improvements		41,497
Costs Capitalized Subsequent to Acquisition		2,490
Gross Amount at Which Carried at Close of Period, Land	[3]	10,374
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	43,988
Total		54,362
Accumulated depreciation	[2]	$ 19,632
Office [Member] | 140 East Ridgewood [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		1997
Related Encumbrances		$ 11,720
Initial Costs, Land		7,932
Initial Costs, Building and Improvements		31,463
Costs Capitalized Subsequent to Acquisition		7,578
Gross Amount at Which Carried at Close of Period, Land	[3]	7,932
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	39,041
Total		46,973
Accumulated depreciation	[2]	$ 17,789
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		10,587
Gross Amount at Which Carried at Close of Period, Land	[3]	13,194
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	63,365
Total		76,559
Accumulated depreciation	[2]	$ 24,838
Office [Member] | 650 From Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1978
Acquired		1997
Related Encumbrances		$ 22,484
Initial Costs, Land		10,487
Initial Costs, Building and Improvements		41,949
Costs Capitalized Subsequent to Acquisition		8,189
Gross Amount at Which Carried at Close of Period, Land	[3]	10,487
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	50,138
Total		60,625
Accumulated depreciation	[2]	$ 22,344
Office [Member] | 61 South Paramus Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1985
Acquired	[3]	1997
Related Encumbrances	[3]	$ 22,005
Initial Costs, Land	[3]	9,005
Initial Costs, Building and Improvements	[3]	36,018
Costs Capitalized Subsequent to Acquisition	[3]	9,162
Gross Amount at Which Carried at Close of Period, Land	[3]	9,005
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	45,180
Total	[3]	54,185
Accumulated depreciation	[2],[3]	$ 20,390
Office [Member] | 120 West Passaic Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1972
Acquired		1997
Initial Costs, Land		$ 1,354
Initial Costs, Building and Improvements		5,415
Costs Capitalized Subsequent to Acquisition		431
Gross Amount at Which Carried at Close of Period, Land	[3]	1,357
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	5,843
Total		7,200
Accumulated depreciation	[2]	$ 2,582
Office [Member] | 365 West Passaic Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1976
Acquired		1997
Related Encumbrances		$ 11,720
Initial Costs, Land		4,148
Initial Costs, Building and Improvements		16,592
Costs Capitalized Subsequent to Acquisition		5,497
Gross Amount at Which Carried at Close of Period, Land	[3]	4,148
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	22,089
Total		26,237
Accumulated depreciation	[2]	$ 9,804
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		1,020
Gross Amount at Which Carried at Close of Period, Land	[3]	2,550
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	18,151
Total		20,701
Accumulated depreciation	[2]	$ 4,324
Office [Member] | 1 Lake Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1994
Acquired		1997
Related Encumbrances		$ 40,184
Initial Costs, Land		13,952
Initial Costs, Building and Improvements		55,812
Costs Capitalized Subsequent to Acquisition		(37,797)
Gross Amount at Which Carried at Close of Period, Land	[3]	6,268
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	25,699
Total		31,967
Accumulated depreciation	[2]	$ 15,132
Office [Member] | 10 Mountainview Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1998
Initial Costs, Land		$ 4,240
Initial Costs, Building and Improvements		20,485
Costs Capitalized Subsequent to Acquisition		4,743
Gross Amount at Which Carried at Close of Period, Land	[3]	4,240
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	25,228
Total		29,468
Accumulated depreciation	[2]	$ 11,358
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		(6,770)
Gross Amount at Which Carried at Close of Period, Land	[3]	2,312
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	11,921
Total		14,233
Accumulated depreciation	[2]	$ 6,579
Office [Member] | 50 Tice Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1994
Related Encumbrances		$ 22,962
Initial Costs, Land		4,500
Costs Capitalized Subsequent to Acquisition		27,862
Gross Amount at Which Carried at Close of Period, Land	[3]	4,500
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	27,862
Total		32,362
Accumulated depreciation	[2]	$ 19,320
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		6,385
Gross Amount at Which Carried at Close of Period, Land	[3]	5,424
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	36,073
Total		41,497
Accumulated depreciation	[2]	$ 16,438
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		8,203
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]	58,628
Total		71,234
Accumulated depreciation	[2]	$ 25,768
Office [Member] | 4 Becker Farm Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2009
Related Encumbrances		$ 40,083
Initial Costs, Land		5,600
Initial Costs, Building and Improvements		38,285
Costs Capitalized Subsequent to Acquisition		(9,089)
Gross Amount at Which Carried at Close of Period, Land	[1]	4,271
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	30,525
Total		34,796
Accumulated depreciation	[2]	$ 6,756
Office [Member] | 6 Becker Farm Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		2009
Related Encumbrances		$ 13,829
Initial Costs, Land		2,600
Initial Costs, Building and Improvements		15,548
Costs Capitalized Subsequent to Acquisition		(7,006)
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]	9,586
Total		11,142
Accumulated depreciation	[2]	$ 2,055
Office [Member] | 101 Eisenhower Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Acquired		1994
Initial Costs, Land		$ 228
Costs Capitalized Subsequent to Acquisition		21,850
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]	21,850
Total		22,078
Accumulated depreciation	[2]	$ 14,063
Office [Member] | 103 Eisenhower Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		1994
Costs Capitalized Subsequent to Acquisition		$ 16,898
Gross Amount at Which Carried at Close of Period, Land	[1]	2,300
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	14,598
Total		16,898
Accumulated depreciation	[2]	$ 9,448
Office [Member] | 105 Eisenhower Parkway [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2001
Acquired		2001
Initial Costs, Land		$ 4,430
Initial Costs, Building and Improvements		42,898
Costs Capitalized Subsequent to Acquisition		5,670
Gross Amount at Which Carried at Close of Period, Land	[1]	3,835
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	49,163
Total		52,998
Accumulated depreciation	[2]	$ 22,616
Office [Member] | 75 Livingston Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		2009
Related Encumbrances		$ 10,599
Initial Costs, Land		1,900
Initial Costs, Building and Improvements		6,312
Costs Capitalized Subsequent to Acquisition		(1,630)
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]	5,301
Total		6,582
Accumulated depreciation	[2]	$ 1,206
Office [Member] | 85 Livingston Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		2009
Related Encumbrances		$ 14,862
Initial Costs, Land		2,500
Initial Costs, Building and Improvements		14,238
Costs Capitalized Subsequent to Acquisition		(8,238)
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]	7,266
Total		8,500
Accumulated depreciation	[2]	$ 1,622
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		27,985
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]	78,998
Total		82,921
Accumulated depreciation	[2]	$ 39,183
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		25,245
Gross Amount at Which Carried at Close of Period, Land	[1]	12,844
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	131,602
Total		144,446
Accumulated depreciation	[2]	$ 58,486
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		24,911
Gross Amount at Which Carried at Close of Period, Land	[1]	12,843
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	131,601
Total		144,444
Accumulated depreciation	[2]	$ 58,486
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		14,601
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]	70,745
Total		71,989
Accumulated depreciation	[2]	$ 30,770
Office [Member] | Harborside Plaza 5 [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2002
Acquired		2002
Related Encumbrances		$ 217,736
Initial Costs, Land		6,218
Initial Costs, Building and Improvements		170,682
Costs Capitalized Subsequent to Acquisition		56,368
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]	227,563
Total		233,268
Accumulated depreciation	[2]	$ 86,807
Office [Member] | 101 Hudson Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1992
Acquired		2005
Initial Costs, Land		$ 45,530
Initial Costs, Building and Improvements		271,376
Costs Capitalized Subsequent to Acquisition		4,723
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]	276,099
Total		321,629
Accumulated depreciation	[2]	$ 76,102
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		1,391
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]	4,609
Total		4,851
Accumulated depreciation	[2]	$ 1,321
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		17,196
Accumulated depreciation	[2]	$ 4,028
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		846
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]	4,333
Total		4,809
Accumulated depreciation	[2]	$ 967
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		3,304
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]	11,172
Total		13,738
Accumulated depreciation	[2]	$ 5,460
Office [Member] | 2 Independence Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		2009
Initial Costs, Land		$ 1,300
Initial Costs, Building and Improvements		7,246
Costs Capitalized Subsequent to Acquisition		(4,079)
Gross Amount at Which Carried at Close of Period, Land	[1]	702
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	3,765
Total		4,467
Accumulated depreciation	[2]	$ 166
Office [Member] | 3 Independence Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1983
Acquired		1997
Initial Costs, Land		$ 1,997
Initial Costs, Building and Improvements		11,391
Costs Capitalized Subsequent to Acquisition		4,374
Gross Amount at Which Carried at Close of Period, Land	[1]	1,997
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	15,765
Total		17,762
Accumulated depreciation	[2]	$ 7,732
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		3,666
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]	25,420
Total		27,798
Accumulated depreciation	[2]	$ 11,149
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		2,962
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]	12,762
Total		13,419
Accumulated depreciation	[2]	$ 6,823
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		3,567
Accumulated depreciation	[2]	$ 1,349
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
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]	40,762
Total		46,304
Accumulated depreciation	[2]	$ 247
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		3,349
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]	42,450
Total		48,477
Accumulated depreciation	[2]	$ 12,243
Office [Member] | 500 College Road East [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1984
Acquired	[3]	1998
Initial Costs, Land	[3]	$ 614
Initial Costs, Building and Improvements	[3]	20,626
Costs Capitalized Subsequent to Acquisition	[3]	4,839
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	614
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	25,465
Total	[3]	26,079
Accumulated depreciation	[2],[3]	$ 11,312
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		26,135
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]	34,206
Total		42,321
Accumulated depreciation	[2]	$ 16,730
Office [Member] | 2 Paragon Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		2005
Initial Costs, Land		$ 999
Initial Costs, Building and Improvements		4,619
Costs Capitalized Subsequent to Acquisition		(864)
Gross Amount at Which Carried at Close of Period, Land	[1]	720
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,034
Total		4,754
Accumulated depreciation	[2]	$ 1,263
Office [Member] | 3 Paragon Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		2005
Initial Costs, Land		$ 1,423
Initial Costs, Building and Improvements		6,041
Costs Capitalized Subsequent to Acquisition		(979)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,020
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,465
Total		6,485
Accumulated depreciation	[2]	$ 1,809
Office [Member] | 4 Paragon Way [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2002
Acquired		2005
Initial Costs, Land		$ 1,961
Initial Costs, Building and Improvements		8,827
Costs Capitalized Subsequent to Acquisition		(3,107)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,404
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,277
Total		7,681
Accumulated depreciation	[2]	$ 1,585
Office [Member] | 100 Willowbrook Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2005
Initial Costs, Land		$ 1,264
Initial Costs, Building and Improvements		5,573
Costs Capitalized Subsequent to Acquisition		(1,543)
Gross Amount at Which Carried at Close of Period, Land	[1]	869
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,425
Total		5,294
Accumulated depreciation	[2]	$ 1,442
Office [Member] | 23 Main Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1977
Acquired		2005
Related Encumbrances		$ 28,541
Initial Costs, Land		4,336
Initial Costs, Building and Improvements		19,544
Costs Capitalized Subsequent to Acquisition		9,133
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]	28,677
Total		33,013
Accumulated depreciation	[2]	$ 12,775
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		$ 10,721
Initial Costs, Land		3,070
Initial Costs, Building and Improvements		17,414
Costs Capitalized Subsequent to Acquisition		4,065
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]	22,098
Total		24,549
Accumulated depreciation	[2]	$ 7,840
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		$ 12,026
Initial Costs, Land		2,468
Initial Costs, Building and Improvements		15,043
Costs Capitalized Subsequent to Acquisition		3,894
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]	18,953
Total		21,405
Accumulated depreciation	[2]	$ 5,441
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		$ 19,112
Initial Costs, Land		4,051
Initial Costs, Building and Improvements		24,790
Costs Capitalized Subsequent to Acquisition		6,171
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]	30,385
Total		35,012
Accumulated depreciation	[2]	$ 9,435
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		11,397
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]	29,543
Total		30,641
Accumulated depreciation	[2]	$ 11,448
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		707
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]	3,311
Total		3,602
Accumulated depreciation	[2]	$ 1,618
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		1,049
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]	8,183
Total		8,637
Accumulated depreciation	[2]	$ 4,016
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		17,770
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]	17,770
Total		19,334
Accumulated depreciation	[2]	$ 11,013
Office [Member] | 250 Johnson Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1977
Acquired		1997
Initial Costs, Land		$ 2,004
Initial Costs, Building and Improvements		8,016
Costs Capitalized Subsequent to Acquisition		(3,806)
Gross Amount at Which Carried at Close of Period, Land	[1]	930
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,284
Total		6,214
Accumulated depreciation	[2]	$ 4,265
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		3,351
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]	12,978
Total		15,385
Accumulated depreciation	[2]	$ 5,661
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		3,953
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]	24,937
Total		30,150
Accumulated depreciation	[2]	$ 8,914
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		3,368
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]	21,164
Total		25,575
Accumulated depreciation	[2]	$ 8,231
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		6,298
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]	34,086
Total		36,018
Accumulated depreciation	[2]	$ 15,795
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		4,823
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]	40,279
Total		42,144
Accumulated depreciation	[2]	$ 17,257
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		16,882
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]	26,113
Total		31,955
Accumulated depreciation	[2]	$ 10,295
Office [Member] | 4 Century Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		2004
Initial Costs, Land		$ 1,787
Initial Costs, Building and Improvements		9,575
Costs Capitalized Subsequent to Acquisition		(3,432)
Gross Amount at Which Carried at Close of Period, Land	[1]	1,086
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,844
Total		7,930
Accumulated depreciation	[2]	$ 2,188
Office [Member] | 5 Century Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		2004
Initial Costs, Land		$ 1,762
Initial Costs, Building and Improvements		9,341
Costs Capitalized Subsequent to Acquisition		(3,796)
Gross Amount at Which Carried at Close of Period, Land	[1]	953
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,354
Total		7,307
Accumulated depreciation	[2]	$ 2,109
Office [Member] | 6 Century Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		2004
Initial Costs, Land		$ 1,289
Initial Costs, Building and Improvements		6,848
Costs Capitalized Subsequent to Acquisition		(631)
Gross Amount at Which Carried at Close of Period, Land	[1]	990
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,516
Total		7,506
Accumulated depreciation	[2]	$ 1,966
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		1,308
Accumulated depreciation	[2]	$ 264
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		4,055
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]	37,984
Total		46,436
Accumulated depreciation	[2]	$ 15,223
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		4,434
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]	36,441
Total		38,412
Accumulated depreciation	[2]	$ 16,638
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		12,340
Accumulated depreciation	[2]	$ 6,117
Office [Member] | 600 Parsippany Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1978
Acquired		1994
Initial Costs, Land		$ 1,257
Initial Costs, Building and Improvements		5,594
Costs Capitalized Subsequent to Acquisition		3,102
Gross Amount at Which Carried at Close of Period, Land	[1]	1,257
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,696
Total		9,953
Accumulated depreciation	[2]	$ 4,631
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		2,914
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]	28,281
Total		29,302
Accumulated depreciation	[2]	$ 13,702
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
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]	4,710
Total		$ 10,300
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		2,866
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]	28,079
Total		29,240
Accumulated depreciation	[2]	$ 12,067
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		1,185
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]	27,268
Total		29,352
Accumulated depreciation	[2]	$ 11,760
Office [Member] | 20 Waterview Boulevard [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2009
Related Encumbrances		$ 23,989
Initial Costs, Land		4,500
Initial Costs, Building and Improvements		27,246
Costs Capitalized Subsequent to Acquisition		(4,222)
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]	23,708
Total		27,524
Accumulated depreciation	[2]	$ 4,895
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		1,161
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]	29,220
Total		34,353
Accumulated depreciation	[2]	$ 8,100
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		15,538
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]	42,026
Total		47,328
Accumulated depreciation	[2]	$ 15,275
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		2,766
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]	8,164
Total		9,266
Accumulated depreciation	[2]	$ 4,367
Office [Member] | 222 Mt. Airy Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1986
Acquired		1996
Initial Costs, Land		$ 775
Initial Costs, Building and Improvements		3,636
Costs Capitalized Subsequent to Acquisition		1,848
Gross Amount at Which Carried at Close of Period, Land	[1]	697
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,562
Total		6,259
Accumulated depreciation	[3]	$ 2,747
Office [Member] | 233 Mt. Airy Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1996
Initial Costs, Land		$ 1,034
Initial Costs, Building and Improvements		5,033
Costs Capitalized Subsequent to Acquisition		1,254
Gross Amount at Which Carried at Close of Period, Land	[1]	915
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,406
Total		7,321
Accumulated depreciation	[3]	$ 2,677
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		4,940
Gross Amount at Which Carried at Close of Period, Land	[1]	3,986
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	18,598
Total		22,584
Accumulated depreciation	[3]	$ 4,638
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		(952)
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]	27,630
Total		32,697
Accumulated depreciation	[3]	$ 14,895
Office [Member] | 100 Walnut Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1985
Acquired		1994
Related Encumbrances		$ 18,273
Costs Capitalized Subsequent to Acquisition		17,801
Gross Amount at Which Carried at Close of Period, Land	[1]	1,822
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	15,979
Total		17,801
Accumulated depreciation	[3]	$ 10,958
Office [Member] | 6 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1973
Acquired		1994
Initial Costs, Land		$ 250
Costs Capitalized Subsequent to Acquisition		1,728
Gross Amount at Which Carried at Close of Period, Land	[1]	250
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	1,728
Total		1,978
Accumulated depreciation	[3]	$ 704
Office [Member] | 11 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1981
Acquired		1994
Initial Costs, Land		$ 470
Costs Capitalized Subsequent to Acquisition		5,490
Gross Amount at Which Carried at Close of Period, Land	[1]	470
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,490
Total		5,960
Accumulated depreciation	[3]	$ 4,644
Office [Member] | 12 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1967
Acquired		1997
Initial Costs, Land		$ 887
Initial Costs, Building and Improvements		3,549
Costs Capitalized Subsequent to Acquisition		1,543
Gross Amount at Which Carried at Close of Period, Land	[1]	887
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	5,092
Total		5,979
Accumulated depreciation	[3]	$ 2,566
Office [Member] | 14 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1971
Acquired		2003
Initial Costs, Land		$ 1,283
Initial Costs, Building and Improvements		6,344
Costs Capitalized Subsequent to Acquisition		1,613
Gross Amount at Which Carried at Close of Period, Land	[1]	1,283
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,957
Total		9,240
Accumulated depreciation	[3]	$ 2,477
Office [Member] | 20 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1990
Acquired		1994
Initial Costs, Land		$ 2,346
Costs Capitalized Subsequent to Acquisition		21,663
Gross Amount at Which Carried at Close of Period, Land	[1]	2,346
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	21,663
Total		24,009
Accumulated depreciation	[3]	$ 11,901
Office [Member] | 25 Commerce Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1971
Acquired		2002
Initial Costs, Land		$ 1,520
Initial Costs, Building and Improvements		6,186
Costs Capitalized Subsequent to Acquisition		864
Gross Amount at Which Carried at Close of Period, Land	[1]	1,520
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,050
Total		8,570
Accumulated depreciation	[3]	$ 3,239
Office [Member] | 65 Jackson Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Acquired		1994
Initial Costs, Land		$ 541
Costs Capitalized Subsequent to Acquisition		6,377
Gross Amount at Which Carried at Close of Period, Land	[1]	542
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,376
Total		6,918
Accumulated depreciation	[3]	$ 4,381
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		(4,798)
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]	7,464
Total		9,183
Accumulated depreciation	[3]	$ 3,212
Office [Member] | 125 Broad Street [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1970
Acquired		2007
Initial Costs, Land		$ 50,191
Initial Costs, Building and Improvements		207,002
Costs Capitalized Subsequent to Acquisition		(48,039)
Gross Amount at Which Carried at Close of Period, Land	[1]	33,829
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	175,325
Total		209,154
Accumulated depreciation	[3]	$ 37,852
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		1,617
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]	6,983
Total		7,203
Accumulated depreciation	[3]	$ 3,352
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		(3,528)
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]	2,476
Total		2,577
Accumulated depreciation	[3]	$ 2,468
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		1,987
Accumulated depreciation	[2]	$ 943
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		4,711
Accumulated depreciation	[2]	$ 2,270
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		2,564
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]	15,577
Total		15,907
Accumulated depreciation	[2]	$ 6,690
Office [Member] | 17 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1989
Acquired	[3]	1997
Initial Costs, Building and Improvements	[3]	$ 7,269
Costs Capitalized Subsequent to Acquisition	[3]	1,484
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	8,753
Total	[3]	8,753
Accumulated depreciation	[2],[3]	$ 3,998
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		2,590
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]	12,220
Total		12,427
Accumulated depreciation	[2]	$ 5,489
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		1,848
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]	9,712
Total		9,834
Accumulated depreciation	[2]	$ 4,473
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		14,554
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]	62,659
Total		63,223
Accumulated depreciation	[2]	$ 29,323
Office [Member] | 11 Martine Avenue [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1997
Initial Costs, Land		$ 127
Initial Costs, Building and Improvements		26,833
Costs Capitalized Subsequent to Acquisition		8,561
Gross Amount at Which Carried at Close of Period, Land	[1]	127
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	35,394
Total		35,521
Accumulated depreciation	[2]	$ 16,002
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		1,341
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]	6,723
Total		6,934
Accumulated depreciation	[2]	$ 3,043
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		2,998
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]	14,901
Total		16,006
Accumulated depreciation	[2]	$ 6,732
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		1,772
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]	8,028
Total		8,413
Accumulated depreciation	[2]	$ 3,625
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		8,431
Accumulated depreciation	[2]	$ 3,259
Office [Member] | 1201 Connecticut Avenue, NW [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1940
Acquired		1999
Initial Costs, Land		$ 14,228
Initial Costs, Building and Improvements		18,571
Costs Capitalized Subsequent to Acquisition		6,895
Gross Amount at Which Carried at Close of Period, Land	[1]	14,228
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	25,466
Total		39,694
Accumulated depreciation	[2]	$ 11,390
Office [Member] | 1400 L Street, NW [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		1998
Initial Costs, Land		$ 13,054
Initial Costs, Building and Improvements		27,423
Costs Capitalized Subsequent to Acquisition		7,910
Gross Amount at Which Carried at Close of Period, Land	[1]	13,054
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	35,333
Total		48,387
Accumulated depreciation	[2]	$ 18,841
Office [Member] | 9200 Edmonston Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		2006
Related Encumbrances		$ 3,793
Initial Costs, Land		1,547
Initial Costs, Building and Improvements		4,131
Costs Capitalized Subsequent to Acquisition		(2,484)
Gross Amount at Which Carried at Close of Period, Land	[1]	610
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,584
Total		3,194
Accumulated depreciation	[2]	$ 1,376
Office [Member] | 6301 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		2006
Initial Costs, Land		$ 5,168
Initial Costs, Building and Improvements		14,706
Costs Capitalized Subsequent to Acquisition		(9,924)
Gross Amount at Which Carried at Close of Period, Land	[1]	2,431
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,519
Total		9,950
Accumulated depreciation	[2]	$ 1,988
Office [Member] | 6303 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		2006
Initial Costs, Land		$ 5,115
Initial Costs, Building and Improvements		13,860
Costs Capitalized Subsequent to Acquisition		(10,097)
Gross Amount at Which Carried at Close of Period, Land	[1]	2,436
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	6,442
Total		8,878
Accumulated depreciation	[2]	$ 1,584
Office [Member] | 6305 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		2006
Initial Costs, Land		$ 5,615
Initial Costs, Building and Improvements		14,420
Costs Capitalized Subsequent to Acquisition		(10,137)
Gross Amount at Which Carried at Close of Period, Land	[1]	2,599
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	7,299
Total		9,898
Accumulated depreciation	[2]	$ 1,972
Office [Member] | 6404 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1987
Acquired		2006
Initial Costs, Land		$ 7,578
Initial Costs, Building and Improvements		20,785
Costs Capitalized Subsequent to Acquisition		(14,343)
Gross Amount at Which Carried at Close of Period, Land	[1]	3,437
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	10,583
Total		14,020
Accumulated depreciation	[2]	$ 3,376
Office [Member] | 6406 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1991
Acquired		2006
Initial Costs, Land		$ 7,514
Initial Costs, Building and Improvements		21,152
Costs Capitalized Subsequent to Acquisition		(14,034)
Gross Amount at Which Carried at Close of Period, Land	[1]	3,158
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	11,474
Total		14,632
Accumulated depreciation	[2]	$ 2,570
Office [Member] | 6411 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		2006
Initial Costs, Land		$ 6,867
Initial Costs, Building and Improvements		17,470
Costs Capitalized Subsequent to Acquisition		(12,445)
Gross Amount at Which Carried at Close of Period, Land	[1]	3,216
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,676
Total		11,892
Accumulated depreciation	[2]	$ 2,452
Office [Member] | 4200 Parliament Place [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1989
Acquired		1998
Initial Costs, Land		$ 2,114
Initial Costs, Building and Improvements		13,546
Costs Capitalized Subsequent to Acquisition		(6,173)
Gross Amount at Which Carried at Close of Period, Land	[1]	774
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	8,713
Total		9,487
Accumulated depreciation	[2]	$ 4,258
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		1,549
Gross Amount at Which Carried at Close of Period, Land	[3]	658
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	4,976
Total		5,634
Accumulated depreciation	[2]	$ 2,285
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		2,272
Gross Amount at Which Carried at Close of Period, Land	[3]	569
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	6,059
Total		6,628
Accumulated depreciation	[2]	$ 2,856
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		544
Gross Amount at Which Carried at Close of Period, Land	[3]	723
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	3,437
Total		4,160
Accumulated depreciation	[2]	$ 1,461
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	[3]	426
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	3,960
Total		4,386
Accumulated depreciation	[2]	$ 1,893
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		482
Gross Amount at Which Carried at Close of Period, Land	[3]	389
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,036
Total		2,425
Accumulated depreciation	[2]	$ 732
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		349
Gross Amount at Which Carried at Close of Period, Land	[3]	258
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,039
Total		2,297
Accumulated depreciation	[2]	$ 922
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		384
Gross Amount at Which Carried at Close of Period, Land	[3]	490
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,347
Total		2,837
Accumulated depreciation	[2]	$ 919
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	[3]	228
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,223
Total		2,451
Accumulated depreciation	[2]	$ 979
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		980
Gross Amount at Which Carried at Close of Period, Land	[3]	801
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	4,186
Total		4,987
Accumulated depreciation	[2]	$ 1,530
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		701
Gross Amount at Which Carried at Close of Period, Land	[3]	244
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,960
Total		3,204
Accumulated depreciation	[2]	$ 1,328
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	[3]	357
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	4,023
Total		4,380
Accumulated depreciation	[2]	$ 1,812
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		457
Gross Amount at Which Carried at Close of Period, Land	[3]	326
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,931
Total		3,257
Accumulated depreciation	[2]	$ 1,280
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		389
Gross Amount at Which Carried at Close of Period, Land	[3]	211
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	1,768
Total		1,979
Accumulated depreciation	[2]	$ 885
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	[3]	120
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	1,314
Total		1,434
Accumulated depreciation	[2]	$ 612
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	[3]	691
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	2,920
Total		3,611
Accumulated depreciation	[2]	$ 1,078
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		175
Gross Amount at Which Carried at Close of Period, Land	[3]	805
Gross Amount at Which Carried at Close of Period, Building and Improvements	[3]	3,444
Total		4,249
Accumulated depreciation	[2]	$ 1,287
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		4,110
Accumulated depreciation	[2]	$ 1,678
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		499
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]	2,861
Total		3,194
Accumulated depreciation	[2]	$ 1,286
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		298
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]	2,010
Total		2,251
Accumulated depreciation	[2]	$ 957
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		215
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]	2,249
Total		2,757
Accumulated depreciation	[2]	$ 985
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		225
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]	3,032
Total		3,733
Accumulated depreciation	[2]	$ 1,077
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		2,698
Accumulated depreciation	[2]	$ 1,251
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		4,349
Accumulated depreciation	[2]	$ 1,303
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		2,850
Accumulated depreciation	[2]	$ 1,180
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		3,278
Accumulated depreciation	[2]	$ 1,016
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		98
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]	2,425
Total		2,729
Accumulated depreciation	[2]	$ 1,133
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		730
Gross Amount at Which Carried at Close of Period, Land	[1]	325
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	2,286
Total		2,611
Accumulated depreciation	[2]	$ 1,029
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		715
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]	3,590
Total		3,947
Accumulated depreciation	[2]	$ 1,845
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		1,428
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]	5,631
Total		6,162
Accumulated depreciation	[2]	$ 2,641
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		901
Gross Amount at Which Carried at Close of Period, Land	[1]	496
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	4,179
Total		4,675
Accumulated depreciation	[2]	$ 2,152
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		709
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]	7,573
Total		8,258
Accumulated depreciation	[2]	$ 2,478
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		725
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]	3,653
Total		3,923
Accumulated depreciation	[2]	$ 1,914
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		1,836
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]	6,457
Total		6,946
Accumulated depreciation	[2]	$ 3,434
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		1,772
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]	7,474
Total		8,498
Accumulated depreciation	[2]	$ 3,841
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		1,655
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]	5,976
Total		6,865
Accumulated depreciation	[2]	$ 2,972
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		291
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]	1,615
Total		1,831
Accumulated depreciation	[2]	$ 908
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		317
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]	1,796
Total		1,986
Accumulated depreciation	[2]	$ 853
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		490
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]	2,314
Total		2,584
Accumulated depreciation	[2]	$ 990
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		2,476
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]	2,476
Total		2,667
Accumulated depreciation	[2]	$ 1,089
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		4,572
Accumulated depreciation	[2]	$ 2,086
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		111
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]	3,219
Total		3,735
Accumulated depreciation	[2]	$ 1,600
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		4,639
Accumulated depreciation	[2]	$ 1,809
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		1,509
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]	4,769
Total		5,285
Accumulated depreciation	[2]	$ 2,293
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		497
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]	3,876
Total		4,412
Accumulated depreciation	[2]	$ 1,940
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		507
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]	3,764
Total		4,290
Accumulated depreciation	[2]	$ 2,048
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		1,348
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]	1,348
Total		1,575
Accumulated depreciation	[2]	$ 638
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		1,348
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]	1,348
Total		1,574
Accumulated depreciation	[2]	$ 637
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		1,284
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]	1,283
Total		1,512
Accumulated depreciation	[2]	$ 657
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		1,282
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]	1,283
Total		1,511
Accumulated depreciation	[2]	$ 657
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		602
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]	2,761
Total		2,910
Accumulated depreciation	[3]	$ 1,278
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		7,087
Accumulated depreciation	[3]	$ 2,259
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		(445)
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]	3,231
Total		4,286
Accumulated depreciation	[3]	$ 1,145
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		2,221
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]	9,251
Total		9,748
Accumulated depreciation	[3]	$ 4,104
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		762
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]	8,235
Total		8,890
Accumulated depreciation	[3]	$ 3,863
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		1,888
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]	8,508
Total		9,087
Accumulated depreciation	[3]	$ 3,852
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		2,395
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]	11,042
Total		11,909
Accumulated depreciation	[3]	$ 4,697
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		441
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]	3,058
Total		3,295
Accumulated depreciation	[3]	$ 1,404
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		212
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]	1,316
Total		1,350
Accumulated depreciation	[3]	$ 677
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		516
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]	3,023
Total		3,178
Accumulated depreciation	[3]	$ 1,284
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		4,375
Accumulated depreciation	[3]	$ 1,802
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		2,068
Accumulated depreciation	[2]	$ 942
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		7,885
Accumulated depreciation	[2]	$ 3,502
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		938
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]	2,784
Total		4,986
Accumulated depreciation	[2]	$ 1,407
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		4,875
Accumulated depreciation	[2]	$ 2,268
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		837
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]	6,336
Total		6,681
Accumulated depreciation	[2]	$ 3,082
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		469
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]	2,492
Total		2,691
Accumulated depreciation	[2]	$ 1,318
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		686
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]	3,412
Total		3,646
Accumulated depreciation	[2]	$ 1,510
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		1,343
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]	9,279
Total		9,934
Accumulated depreciation	[2]	$ 4,453
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		1,244
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]	4,973
Total		5,293
Accumulated depreciation	[2]	$ 2,455
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		425
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]	2,374
Total		2,492
Accumulated depreciation	[2]	$ 1,219
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		166
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]	2,164
Total		2,328
Accumulated depreciation	[2]	$ 1,012
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		681
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]	5,002
Total		5,288
Accumulated depreciation	[2]	$ 2,187
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		1,917
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]	7,179
Total		7,626
Accumulated depreciation	[2]	$ 3,157
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		4,239
Accumulated depreciation	[2]	$ 1,831
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		2,873
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]	10,386
Total		10,749
Accumulated depreciation	[2]	$ 5,320
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		1,747
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]	10,663
Total		12,882
Accumulated depreciation	[2]	$ 4,706
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		1,498
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]	4,469
Total		5,209
Accumulated depreciation	[2]	$ 2,380
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		769
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]	5,179
Total		5,391
Accumulated depreciation	[2]	$ 2,557
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		732
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]	3,531
Total		3,665
Accumulated depreciation	[2]	$ 1,903
Office And Office/Flex Buildings [Member] | 11 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1989
Acquired	[3]	1997
Initial Costs, Building and Improvements	[3]	$ 4,788
Costs Capitalized Subsequent to Acquisition	[3]	761
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	5,549
Total	[3]	5,549
Accumulated depreciation	[2],[3]	$ 2,409
Office And Office/Flex Buildings [Member] | 12 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1999
Acquired	[3]	1999
Initial Costs, Land	[3]	$ 1,562
Initial Costs, Building and Improvements	[3]	3,254
Costs Capitalized Subsequent to Acquisition	[3]	200
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	1,320
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	3,696
Total	[3]	5,016
Accumulated depreciation	[2],[3]	$ 1,497
Office And Office/Flex Buildings [Member] | 15 Skyline Drive [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1989
Acquired	[3]	1997
Initial Costs, Building and Improvements	[3]	$ 7,449
Costs Capitalized Subsequent to Acquisition	[3]	1,060
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	8,509
Total	[3]	8,509
Accumulated depreciation	[2],[3]	$ 3,620
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		11,909
Accumulated depreciation	[2]	$ 5,342
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		1,472
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]	9,047
Total		9,549
Accumulated depreciation	[2]	$ 4,473
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		7,860
Accumulated depreciation	[2]	$ 3,294
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		2,206
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]	9,452
Total		9,998
Accumulated depreciation	[2]	$ 4,218
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		2,221
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]	9,036
Total		10,242
Accumulated depreciation	[2]	$ 4,058
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		3,854
Accumulated depreciation	[2]	$ 1,760
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		1,249
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]	5,667
Total		6,086
Accumulated depreciation	[2]	$ 2,482
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		1,298
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]	10,544
Total		15,082
Accumulated depreciation	[2]	$ 5,417
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		654
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]	2,333
Total		2,748
Accumulated depreciation	[2]	$ 899
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		185
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]	4,041
Total		6,016
Accumulated depreciation	[2]	$ 1,956
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		5,922
Accumulated depreciation	[2]	$ 1,426
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		3,524
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]	3,524
Total		4,852
Accumulated depreciation	[2]	$ 1,601
Industrial/Warehouse Facilities [Member] | 1 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1957
Acquired	[3]	1997
Initial Costs, Land	[3]	$ 3
Initial Costs, Building and Improvements	[3]	268
Costs Capitalized Subsequent to Acquisition	[3]	233
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	3
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	501
Total	[3]	504
Accumulated depreciation	[2],[3]	$ 238
Industrial/Warehouse Facilities [Member] | 2 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1957
Acquired	[3]	1997
Initial Costs, Land	[3]	$ 4
Initial Costs, Building and Improvements	[3]	672
Costs Capitalized Subsequent to Acquisition	[3]	232
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	4
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	904
Total	[3]	908
Accumulated depreciation	[2],[3]	$ 378
Industrial/Warehouse Facilities [Member] | 3 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1957
Acquired	[3]	1997
Initial Costs, Land	[3]	$ 21
Initial Costs, Building and Improvements	[3]	1,948
Costs Capitalized Subsequent to Acquisition	[3]	363
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	21
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	2,311
Total	[3]	2,332
Accumulated depreciation	[2],[3]	$ 1,181
Industrial/Warehouse Facilities [Member] | 4 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1957
Acquired	[3]	1997
Initial Costs, Land	[3]	$ 84
Initial Costs, Building and Improvements	[3]	13,393
Costs Capitalized Subsequent to Acquisition	[3]	3,405
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	85
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	16,797
Total	[3]	16,882
Accumulated depreciation	[2],[3]	$ 7,261
Industrial/Warehouse Facilities [Member] | 5 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1957
Acquired	[3]	1997
Initial Costs, Land	[3]	$ 19
Initial Costs, Building and Improvements	[3]	4,804
Costs Capitalized Subsequent to Acquisition	[3]	943
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	19
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	5,747
Total	[3]	5,766
Accumulated depreciation	[2],[3]	$ 2,745
Industrial/Warehouse Facilities [Member] | 6 Warehouse Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built	[3]	1982
Acquired	[3]	1997
Initial Costs, Land	[3]	$ 10
Initial Costs, Building and Improvements	[3]	4,419
Costs Capitalized Subsequent to Acquisition	[3]	2,381
Gross Amount at Which Carried at Close of Period, Land	[1],[3]	10
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1],[3]	6,800
Total	[3]	6,810
Accumulated depreciation	[2],[3]	$ 2,764
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		107
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]	1,952
Total		2,076
Accumulated depreciation	[2]	$ 919
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		2,635
Accumulated depreciation	[2]	$ 1,182
Land [Member] | Capital Office Park Parcel A [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Acquired		2009
Initial Costs, Land		$ 840
Costs Capitalized Subsequent to Acquisition		7
Gross Amount at Which Carried at Close of Period, Land	[1]	847
Total		$ 847
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		1,601
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]	15,135
Total		18,127
Accumulated depreciation	[2]	$ 689
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		729
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]	19,703
Total		23,872
Accumulated depreciation	[2]	$ 965
Multi-Family Properties [Member] | Park Square [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2011
Acquired		2013
Related Encumbrances		$ 27,500
Initial Costs, Land		4,000
Initial Costs, Building and Improvements		40,670
Costs Capitalized Subsequent to Acquisition		256
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]	40,926
Total		44,926
Accumulated depreciation	[3]	$ 2,148
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		879
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]	51,550
Total		60,592
Accumulated depreciation	[2]	$ 3,859
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		250
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]	71,659
Total		83,714
Accumulated depreciation	[2]	$ 5,236
Multi-Family Properties [Member] | Apartments At Andover Place [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1988
Acquired		2014
Initial Costs, Land		$ 8,535
Initial Costs, Building and Improvements		27,609
Costs Capitalized Subsequent to Acquisition		2,263
Gross Amount at Which Carried at Close of Period, Land	[1]	8,534
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	29,873
Total		38,407
Accumulated depreciation	[2]	$ 1,623
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		$ 36,600
Initial Costs, Land		13,099
Initial Costs, Building and Improvements		56,669
Costs Capitalized Subsequent to Acquisition		(21,005)
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]	35,664
Total		48,763
Accumulated depreciation	[2]	2,174
Projects Under Development And Developable Land [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Related Encumbrances		45,899
Initial Costs, Land		204,041
Initial Costs, Building and Improvements		237,906
Gross Amount at Which Carried at Close of Period, Land	[1]	204,041
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	237,906
Total		441,947
Accumulated depreciation	[2]	323
Furniture, Fixtures And Equipment [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Costs Capitalized Subsequent to Acquisition		15,167
Gross Amount at Which Carried at Close of Period, Building and Improvements	[1]	15,167
Total		15,167
Accumulated depreciation	[2]	$ 5,418
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		$ 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		$ 1,380
Minimum [Member] | Office [Member] | 9200 Edmonston Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1973
Minimum [Member] | Office [Member] | 6301 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1979
Minimum [Member] | Office [Member] | 6303 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1980
Minimum [Member] | Office [Member] | 6305 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1982
Minimum [Member] | Office [Member] | 6411 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1984
Maximum [Member] | Office [Member] | 9200 Edmonston Road [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2003
Maximum [Member] | Office [Member] | 6301 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Maximum [Member] | Office [Member] | 6303 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2003
Maximum [Member] | Office [Member] | 6305 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		1995
Maximum [Member] | Office [Member] | 6411 Ivy Lane [Member]
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Year Built		2005
[1] The aggregate cost for federal income tax purposes at December 31, 2015 was approximately $3.3 billion. [2] Depreciation of buildings and improvements are calculated over lives ranging from the life of the lease to 40 years. [3] This property is located on land leased by the Company.