SEC Schedule III Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Properties	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 9,614,838
Real Estate And Accumulated Depreciation Initial Cost Of Land	4,210,570
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,480,028
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,692,399
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,164,799
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,925,338
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	18,090,137
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 3,418,267	$ 3,161,633	$ 2,829,862	$ 2,524,718
Property Plant And Equipment Useful Life	40 years
Net Basis Difference Of Assets And Liabilities Between Tax Basis And GAAP Basis	$ 3,400,000
New York Segment [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,464,905
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,656,750
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,781,814
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,115,700
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,747,173
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,807,091
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	10,554,264
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,814,559
New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,464,905
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,626,847
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,660,102
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,003,752
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,716,237
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,574,464
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	10,290,701
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,706,483
Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	2,003,321
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,032,753
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,346,679
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,438,737
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,032,853
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,492,456
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,525,309
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,050,700
Other Segment [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	2,146,612
Real Estate And Accumulated Depreciation Initial Cost Of Land	521,067
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,351,535
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,021,932
Real Estate And Accumulated Depreciation Carrying Amount Of Land	384,773
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,509,761
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,894,534
Real Estate And Accumulated Depreciation Accumulated Depreciation	467,145
Other Segment [Member] | Illinois [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	550,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	69,694
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	319,146
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	307,338
Real Estate And Accumulated Depreciation Carrying Amount Of Land	69,701
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	626,477
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	696,178
Real Estate And Accumulated Depreciation Accumulated Depreciation	232,480
1290 Avenue of the Americas [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	950,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	515,539
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	923,653
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	156,868
Real Estate And Accumulated Depreciation Carrying Amount Of Land	515,540
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,080,520
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	1,596,060
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 233,742
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
697-703 Fifth Avenue (St. Regis - retail) [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 450,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	152,825
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	584,230
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	152,825
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	584,230
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	737,055
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 17,197
Real Estate And Accumulated Depreciation Year Of Acquisition	2014
350 Park Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 289,242
Real Estate And Accumulated Depreciation Initial Cost Of Land	265,889
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	363,381
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	45,811
Real Estate And Accumulated Depreciation Carrying Amount Of Land	265,889
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	409,192
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	675,081
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 94,115
Real Estate And Accumulated Depreciation Year Of Construction	1960
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
666 Fifth Avenue (Retail Condo) [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 390,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	189,005
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	471,072
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	189,005
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	471,072
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	660,077
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 37,030
Real Estate And Accumulated Depreciation Year Of Acquisition	2012
One Penn Plaza [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	412,169
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	200,348
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	612,517
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	612,517
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 261,693
Real Estate And Accumulated Depreciation Year Of Construction	1972
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
100 West 33rd Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 398,402
Real Estate And Accumulated Depreciation Initial Cost Of Land	242,776
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	247,970
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	31,934
Real Estate And Accumulated Depreciation Carrying Amount Of Land	242,776
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	279,904
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	522,680
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 61,476
Real Estate And Accumulated Depreciation Year Of Construction	1911
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
150 West 34th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 205,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	119,657
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	268,509
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1
Real Estate And Accumulated Depreciation Carrying Amount Of Land	119,658
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	268,509
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	388,167
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 3,916
Real Estate And Accumulated Depreciation Year Of Construction	1900
Real Estate And Accumulated Depreciation Year Of Acquisition	2015
1535 Broadway (Marriott Marquis) [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	249,285
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	137,101
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	386,386
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	386,386
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 4,796
Real Estate And Accumulated Depreciation Year Of Acquisition	2012
1540 Broadway [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	110,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	223,122
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	26,714
Real Estate And Accumulated Depreciation Carrying Amount Of Land	110,001
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	249,835
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	359,836
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 43,592
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
655 Fifth Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 140,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	102,594
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	231,903
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	102,594
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	231,903
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	334,497
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 13,149
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
Two Penn Plaza [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 575,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	53,615
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	164,903
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	98,098
Real Estate And Accumulated Depreciation Carrying Amount Of Land	52,689
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	263,927
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	316,616
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 133,450
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
90 Park Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	8,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	175,890
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	96,269
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	272,159
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	280,159
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 98,331
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
Manhattan Mall [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 181,598
Real Estate And Accumulated Depreciation Initial Cost Of Land	88,595
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	113,473
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	71,400
Real Estate And Accumulated Depreciation Carrying Amount Of Land	88,595
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	184,873
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	273,468
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 48,993
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
770 Broadway [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 353,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	52,898
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	95,686
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	97,290
Real Estate And Accumulated Depreciation Carrying Amount Of Land	52,898
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	192,976
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	245,874
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 75,613
Real Estate And Accumulated Depreciation Year Of Construction	1907
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
888 Seventh Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 375,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	117,269
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	115,848
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	233,117
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	233,117
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 97,680
Real Estate And Accumulated Depreciation Year Of Construction	1980
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
909 Third Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 350,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	120,723
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	80,715
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	201,438
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	201,438
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 76,663
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1999
Eleven Penn Plaza [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 450,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	40,333
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	85,259
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	72,995
Real Estate And Accumulated Depreciation Carrying Amount Of Land	40,333
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	158,254
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	198,587
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 60,765
Real Estate And Accumulated Depreciation Year Of Construction	1923
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
7 West 34th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	182,067
Real Estate And Accumulated Depreciation Carrying Amount Of Land	34,614
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	147,453
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	182,067
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 62,011
Real Estate And Accumulated Depreciation Year Of Construction	1901
Real Estate And Accumulated Depreciation Year Of Acquisition	2000
640 Fifth Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	38,224
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	25,992
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	102,472
Real Estate And Accumulated Depreciation Carrying Amount Of Land	38,224
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	128,464
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	166,688
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 41,282
Real Estate And Accumulated Depreciation Year Of Construction	1950
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
150 East 58th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	39,303
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	80,216
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	40,870
Real Estate And Accumulated Depreciation Carrying Amount Of Land	39,303
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	121,086
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	160,389
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 50,879
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
595 Madison Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	62,731
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	62,888
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	26,218
Real Estate And Accumulated Depreciation Carrying Amount Of Land	62,731
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	89,106
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	151,837
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 33,566
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1999
828 To 850 Madison Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 80,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	107,937
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	28,261
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	10
Real Estate And Accumulated Depreciation Carrying Amount Of Land	107,937
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	28,271
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	136,208
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 7,538
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
33-00 Northern Boulevard [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 61,759
Real Estate And Accumulated Depreciation Initial Cost Of Land	46,505
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	86,226
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	46,505
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	86,226
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	132,731
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 2,189
Real Estate And Accumulated Depreciation Year Of Construction	1915
Real Estate And Accumulated Depreciation Year Of Acquisition	2015
330 West 34th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	8,599
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	111,810
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	120,409
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	120,409
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 6,530
Real Estate And Accumulated Depreciation Year Of Construction	1925
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
715 Lexington Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	26,903
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	63,002
Real Estate And Accumulated Depreciation Carrying Amount Of Land	63,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,905
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	89,905
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 7,243
Real Estate And Accumulated Depreciation Year Of Construction	1923
Real Estate And Accumulated Depreciation Year Of Acquisition	2001
478 To 486 Broadway [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	30,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	20,063
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	33,827
Real Estate And Accumulated Depreciation Carrying Amount Of Land	30,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	53,890
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	83,890
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 9,610
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
4 Union Square South [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 117,904
Real Estate And Accumulated Depreciation Initial Cost Of Land	24,079
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	55,220
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,610
Real Estate And Accumulated Depreciation Carrying Amount Of Land	24,080
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	57,829
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	81,909
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 16,392
Real Estate And Accumulated Depreciation Year Of Construction	1965/2004
Real Estate And Accumulated Depreciation Year Of Acquisition	1993
260 11th Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	80,482
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	10
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	80,492
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	80,492
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 943
Real Estate And Accumulated Depreciation Year Of Construction	1911
Real Estate And Accumulated Depreciation Year Of Acquisition	2015
510 5th Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	34,602
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	18,728
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	19,227
Real Estate And Accumulated Depreciation Carrying Amount Of Land	34,602
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	37,955
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	72,557
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 5,820
Real Estate And Accumulated Depreciation Year Of Acquisition	2010
40 Fulton Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	15,732
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	26,388
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	15,153
Real Estate And Accumulated Depreciation Carrying Amount Of Land	15,732
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	41,541
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	57,273
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 16,888
Real Estate And Accumulated Depreciation Year Of Construction	1987
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
689 Fifth Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	19,721
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	13,446
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	22,809
Real Estate And Accumulated Depreciation Carrying Amount Of Land	19,721
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	36,255
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	55,976
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 9,492
Real Estate And Accumulated Depreciation Year Of Construction	1925
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
443 Broadway [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	11,187
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	41,186
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	11,187
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	41,186
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	52,373
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 2,693
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
40 East 66th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	13,616
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	34,635
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	142
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,616
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	34,777
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	48,393
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 8,739
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
155 Spring Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	13,700
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	30,544
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,582
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	33,126
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	46,826
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 7,527
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
435 Seventh Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 98,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	19,893
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	19,091
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	37
Real Estate And Accumulated Depreciation Carrying Amount Of Land	19,893
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	19,128
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	39,021
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 6,449
Real Estate And Accumulated Depreciation Year Of Construction	2002
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
3040 M Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	7,830
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	27,490
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,256
Real Estate And Accumulated Depreciation Carrying Amount Of Land	7,830
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	30,746
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	38,576
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 7,960
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
608 Fifth Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	33,906
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	33,906
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	33,906
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 3,601
Real Estate And Accumulated Depreciation Year Of Construction	1932
Real Estate And Accumulated Depreciation Year Of Acquisition	2012
692 Broadway [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	6,053
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	22,908
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,540
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,053
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,448
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	32,501
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 6,895
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
265 West 34th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	28,500
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	28,500
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	28,500
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Construction	1920
Real Estate And Accumulated Depreciation Year Of Acquisition	2015
677 To 679 Madison Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	13,070
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,640
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	388
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,070
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	10,028
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	23,098
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 2,401
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
1131 Third Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	7,844
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,844
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	5,198
Real Estate And Accumulated Depreciation Carrying Amount Of Land	7,844
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,042
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	20,886
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 719
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
431 Seventh Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	16,700
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,751
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	16,700
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,751
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	19,451
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 602
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
138-142 West 32nd Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	9,252
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,936
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	9,252
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,936
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	19,188
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 228
Real Estate And Accumulated Depreciation Year Of Construction	1920
Real Estate And Accumulated Depreciation Year Of Acquisition	2015
304 Canal Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,511
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	12,905
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,109
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	17,525
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	17,525
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Construction	1910
Real Estate And Accumulated Depreciation Year Of Acquisition	2014
334 Canal Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,693
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,507
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	7,264
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,693
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,771
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	15,464
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 221
Real Estate And Accumulated Depreciation Year Of Acquisition	2011
267 West 34th Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	5,099
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	10,037
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	5,099
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	10,037
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	15,136
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 548
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
966 Third Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	8,869
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	3,631
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,869
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,631
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	12,500
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 212
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
148 Spring Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,200
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	8,112
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	406
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,518
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,718
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 1,621
Real Estate And Accumulated Depreciation Year Of Acquisition	2008
150 Spring Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,200
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,822
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	258
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,200
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	6,080
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,280
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 1,175
Real Estate And Accumulated Depreciation Year Of Acquisition	2008
137 West 33rd Street [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	6,398
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,550
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,398
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,550
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,948
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 29
Real Estate And Accumulated Depreciation Year Of Construction	1932
Real Estate And Accumulated Depreciation Year Of Acquisition	2015
488 8th Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	10,650
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,767
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(4,674)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,859
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	884
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,743
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 178
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
484 8th Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,856
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	762
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	399
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,856
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,161
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,017
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 365
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
825 7th Avenue [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,483
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	697
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	33
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,483
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	730
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,213
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 341
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
Other (Including Signage) [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	70,683
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	20,378
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	98,431
Real Estate And Accumulated Depreciation Carrying Amount Of Land	70,683
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	118,809
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	189,492
Real Estate And Accumulated Depreciation Accumulated Depreciation	21,395
Paramus [Member] | New York Segment [Member] | New Jersey [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	25,339
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,033
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	24,306
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	25,339
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 12,194
Real Estate And Accumulated Depreciation Year Of Construction	1967
Real Estate And Accumulated Depreciation Year Of Acquisition	1987
Hotel Pennsylvania [Member] | New York Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	29,903
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	121,712
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	86,609
Real Estate And Accumulated Depreciation Carrying Amount Of Land	29,903
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	208,321
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	238,224
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 95,882
Real Estate And Accumulated Depreciation Year Of Construction	1919
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
2011-2451 Crystal Drive - 5 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 220,248
Real Estate And Accumulated Depreciation Initial Cost Of Land	100,935
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	409,920
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	149,218
Real Estate And Accumulated Depreciation Carrying Amount Of Land	100,228
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	559,845
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	660,073
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 213,614
Real Estate And Accumulated Depreciation Year Of Construction	1984-1989
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Number Of Real Estate Properties | Properties	5
Skyline Properties- 8 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 696,319
Real Estate And Accumulated Depreciation Initial Cost Of Land	64,544
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	355,563
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	88,132
Real Estate And Accumulated Depreciation Carrying Amount Of Land	64,355
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	443,884
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	508,239
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 152,263
Real Estate And Accumulated Depreciation Year Of Construction	1973-2001
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Number Of Real Estate Properties | Properties	8
2001 Jefferson Davis Highway, 2100/2200 Crystal Drive, 223 23rd Street, 2221 South Clark Street, Crystal City Shops at 2100, 220 20th Street [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 69,869
Real Estate And Accumulated Depreciation Initial Cost Of Land	57,213
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	131,206
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	404,016
Real Estate And Accumulated Depreciation Carrying Amount Of Land	57,070
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	346,946
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	404,016
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 81,180
Real Estate And Accumulated Depreciation Year Of Construction	1964-1969
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
S. Clark Street/12th Street - 5 buildings [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 55,722
Real Estate And Accumulated Depreciation Initial Cost Of Land	63,420
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	231,267
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	78,426
Real Estate And Accumulated Depreciation Carrying Amount Of Land	63,291
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	309,822
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	373,113
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 101,024
Real Estate And Accumulated Depreciation Year Of Construction	1981, 1983-1987
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
S. Clark Street/12th Street - 5 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number Of Real Estate Properties | Properties	5
1550-1750 Crystal Drive 241-251 18th Street - 4 buildings [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 38,707
Real Estate And Accumulated Depreciation Initial Cost Of Land	64,817
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	218,330
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	79,201
Real Estate And Accumulated Depreciation Carrying Amount Of Land	64,652
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	297,696
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	362,348
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 101,272
Real Estate And Accumulated Depreciation Year Of Construction	1974-1980
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
1550-1750 Crystal Drive 241-251 18th Street - 4 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number Of Real Estate Properties | Properties	4
RiverHouse Apartments [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 307,710
Real Estate And Accumulated Depreciation Initial Cost Of Land	118,421
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	125,078
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	73,611
Real Estate And Accumulated Depreciation Carrying Amount Of Land	138,854
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	178,256
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	317,110
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 40,965
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Met Park / Warehouses [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	106,946
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,326
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	186,466
Real Estate And Accumulated Depreciation Carrying Amount Of Land	124,585
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	170,153
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	294,738
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 67
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
1825-1875 Connecticut Avenue NW (Universal Buildings) - 2 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 185,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	69,393
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	143,320
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	116,996
Real Estate And Accumulated Depreciation Carrying Amount Of Land	68,612
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	156,656
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	225,268
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 38,670
Real Estate And Accumulated Depreciation Year Of Construction	1956, 1963
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Number Of Real Estate Properties | Properties	2
West End 25 [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 101,671
Real Estate And Accumulated Depreciation Initial Cost Of Land	67,049
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,039
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	106,814
Real Estate And Accumulated Depreciation Carrying Amount Of Land	68,198
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	110,704
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	178,902
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 17,389
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
2101 L Street NW [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 146,222
Real Estate And Accumulated Depreciation Initial Cost Of Land	32,815
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	51,642
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	84,372
Real Estate And Accumulated Depreciation Carrying Amount Of Land	39,768
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	129,061
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	168,829
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 35,595
Real Estate And Accumulated Depreciation Year Of Construction	1975
Real Estate And Accumulated Depreciation Year Of Acquisition	2003
2200-2300 Clarendon Blvd (Courthouse Plaza) - 2 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 23,250
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	105,475
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	49,165
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	154,640
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	154,640
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 56,063
Real Estate And Accumulated Depreciation Year Of Construction	1988-1989
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Number Of Real Estate Properties | Properties	2
1800, 1851 And 1901 South Bell Street - 3 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	37,551
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	118,806
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(4,269)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	37,551
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	114,537
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	152,088
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 35,454
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Number Of Real Estate Properties | Properties	3
875 15th Street, NW (Bowen Building) [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 115,022
Real Estate And Accumulated Depreciation Initial Cost Of Land	30,077
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	98,962
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,835
Real Estate And Accumulated Depreciation Carrying Amount Of Land	30,176
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	101,698
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	131,874
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 26,980
Real Estate And Accumulated Depreciation Year Of Construction	2004
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
1399 New York Avenue NW [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	33,481
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	67,363
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	7,047
Real Estate And Accumulated Depreciation Carrying Amount Of Land	34,178
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	73,713
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	107,891
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 10,138
Real Estate And Accumulated Depreciation Year Of Acquisition	2011
Commerce Executive - 3 buildings [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	13,401
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	58,705
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	25,080
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,140
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	84,046
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	97,186
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 29,088
Real Estate And Accumulated Depreciation Year Of Construction	1985-1989
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Number Of Real Estate Properties | Properties	3
H Street - North 10-1D Land Parcel [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	104,473
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	55
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(33,069)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	61,970
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,489
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	71,459
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Crystal City Hotel [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	8,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	47,191
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	10,888
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	58,079
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	66,079
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 16,263
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
1150 17th Street, NW [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 28,728
Real Estate And Accumulated Depreciation Initial Cost Of Land	23,359
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	24,876
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	14,388
Real Estate And Accumulated Depreciation Carrying Amount Of Land	24,723
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	37,900
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	62,623
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 31,700
Real Estate And Accumulated Depreciation Year Of Construction	1970
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Democracy Plaza One [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	33,628
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	6,103
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	39,731
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	39,731
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 18,189
Real Estate And Accumulated Depreciation Year Of Construction	1987
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
1730 M Street, NW [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 14,853
Real Estate And Accumulated Depreciation Initial Cost Of Land	10,095
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	17,541
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	11,863
Real Estate And Accumulated Depreciation Carrying Amount Of Land	10,687
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	28,812
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	39,499
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 11,086
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
1726 M Street, NW [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	9,450
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	22,062
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,433
Real Estate And Accumulated Depreciation Carrying Amount Of Land	9,455
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	25,490
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	34,945
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 21,502
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Crystal Drive Retail [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	20,465
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	7,294
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	27,759
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	27,759
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 11,493
Real Estate And Accumulated Depreciation Year Of Construction	2004
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
1109 South Capitol Street [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	11,541
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	178
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(253)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	11,597
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	(131)
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,466
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
South Capitol [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	4,009
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,273
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(1,920)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,362
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	8,362
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Other Property [Member] | Washington DC Segment [Member] | Washington DC [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,763
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	52,408
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(27,100)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,763
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	25,308
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	27,071
Real Estate And Accumulated Depreciation Accumulated Depreciation	705
theMart, Chicago [Member] | Other Segment [Member] | Illinois [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	550,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	64,528
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	319,146
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	307,313
Real Estate And Accumulated Depreciation Carrying Amount Of Land	64,535
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	626,452
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	690,987
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 232,480
Real Estate And Accumulated Depreciation Year Of Construction	1930
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
527 West Kinzie, Chicago [Member] | Other Segment [Member] | Illinois [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	5,166
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	25
Real Estate And Accumulated Depreciation Carrying Amount Of Land	5,166
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	25
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,191
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
MMPI Piers [Member] | Other Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	13,840
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,840
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	13,840
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 1,426
Real Estate And Accumulated Depreciation Year Of Acquisition	2008
Total The Mart [Member] | Other Segment [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 550,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	69,694
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	319,146
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	321,178
Real Estate And Accumulated Depreciation Carrying Amount Of Land	69,701
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	640,317
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	710,018
Real Estate And Accumulated Depreciation Accumulated Depreciation	233,906
555 California Street [Member] | Other Segment [Member] | California [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	589,063
Real Estate And Accumulated Depreciation Initial Cost Of Land	221,903
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	893,324
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	91,882
Real Estate And Accumulated Depreciation Carrying Amount Of Land	221,903
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	985,206
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	1,207,109
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 217,490
Real Estate And Accumulated Depreciation Year Of Construction	1922/1969/1970
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
220 Central Park South [Member] | Other Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 950,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	115,720
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	16,420
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	654,912
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	787,052
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	787,052
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Borgata Land, Atlantic City, NJ [Member] | Other Segment [Member] | New Jersey [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 57,549
Real Estate And Accumulated Depreciation Initial Cost Of Land	83,089
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	83,089
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	83,089
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 0
Real Estate And Accumulated Depreciation Year Of Acquisition	2010
Wayne Town Center [Member] | Other Segment [Member] | New Jersey [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	26,137
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	42,628
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	68,765
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	68,765
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 8,254
Real Estate And Accumulated Depreciation Year Of Acquisition	2010
40 East 66th Residential [Member] | Other Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	29,199
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	85,798
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	(93,222)
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,454
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,321
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	21,775
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 3,142
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Annapolis [Member] | Other Segment [Member] | Maryland [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,652
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,652
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,652
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 3,207
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
677-679 Madison [Member] | Other Segment [Member] | New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,462
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,058
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	284
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,626
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,178
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,804
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 361
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Other [Member] | Other Segment [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,270
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	4,270
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,270
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 785
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Leasehold Improvements Equipment and Other [Member] | Other Segment [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	$ 0
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	116,030
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	116,030
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	116,030
Real Estate And Accumulated Depreciation Accumulated Depreciation	$ 85,863