Vornado Realty Trust (VNO) 10-K 17 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	VORNADO REALTY TRUST
Entity Central Index Key	899689
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	187,887,498
Entity Public Float		$18,241,786
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Trading Symbol	vno

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Real estate, at cost:
Land	$4,240,009	$4,016,851
Buildings and improvements	13,338,445	12,245,111
Development costs and construction in progress	1,136,344	1,024,714
Leasehold improvements and equipment	130,594	132,270
Total	18,845,392	17,418,946
Less accumulated depreciation and amortization	-3,629,135	-3,296,717
Real estate, net	15,216,257	14,122,229
Cash and cash equivalents	1,198,477	583,290
Restricted cash	186,512	262,440
Marketable securities	206,323	191,917
Tenant and other receivables, net of allowance for doubtful accounts of $17,060 and $21,869	124,144	115,862
Investments in partially owned entities	1,246,496	1,249,667
Real Estate Fund investments (in US Dollars)	513,973	667,710
Receivable arising from the straight-lining of rents, net of allowance of $3,188 and $4,355	877,486	795,256
Deferred leasing and financing costs, net of accumulated amortization of $300,227 and $259,286	503,384	404,907
Identified intangible assets, net of accumulated amortization of $225,841 and 276,426	276,239	307,436
Assets related to discontinued operations	477,620	874,050
Other assets	421,409	522,460
Assets	21,248,320	20,097,224
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Mortgages payable	9,551,700	8,331,993
Senior unsecured notes	1,347,159	1,350,855
Revolving credit facility debt	0	295,870
Accounts payable and accrued expenses	499,702	422,276
Deferred revenue	519,280	529,002
Deferred compensation plan	117,284	116,515
Deferred tax liabilities	1,146	1,280
Liabilities related to discontinued operations	211	14,709
Other liabilities	384,676	436,360
Total liabilities	12,421,158	11,498,860
Commitments and contingencies
Redeemable noncontrolling interests:
Class A units - 11,365,550 and 11,292,038 units outstanding	1,336,780	1,002,620
Series D cumulative redeemable preferred units - 1 unit outstanding	1,000	1,000
Total redeemable noncontrolling interests	1,337,780	1,003,620
Vornado shareholders' equity:
Preferred shares of beneficial interest: no par value per share; authorized 110,000,000 shares; issued and outstanding 52,678,939 and 52,682,807 shares	1,277,026	1,277,225
Common shares of beneficial interest: $.04 par value per share; authorized, 250,000,000 shares; issued and outstanding 187,887,498 and 187,284,688 shares	7,493	7,469
Additional capital	6,873,025	7,143,840
Earnings less than distributions	-1,505,385	-1,734,839
Accumulated other comprehensive income	93,267	71,537
Total Vornado shareholders' equity	6,745,426	6,765,232
Noncontrolling interests in consolidated subsidiaries	743,956	829,512
Total equity	7,489,382	7,594,744
Total liabilities, redeemable noncontrolling interests and equity	21,248,320	20,097,224
Toys R Us [Member]
Real estate, at cost:
Investments in partially owned entities	0	83,224
All Equity Method Investees Excluding Toys [Member]
Real estate, at cost:
Investments in partially owned entities	$1,246,496	$1,166,443

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
ASSETS
Tenant and other receivables, allowance for doubtful accounts (in US dollars)	$17,060	$21,869
Receivable arising from the straight-lining of rents, allowance (in US dollars)	3,188	4,355
Deferred leasing and financing costs, accumulated amortization (in US dollars)	300,227	259,286
Identified intangible assets, accumulated amortization (in US dollars)	$225,841	$276,426
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Preferred Stock, Par Value Per Share	$0	$0
Preferred shares of beneficial interest: authorized shares	110,000,000	110,000,000
Preferred shares of beneficial interest: issued shares	52,678,939	52,682,807
Preferred shares of beneficial interest: outstanding shares	52,678,939	52,682,807
Common shares of beneficial interest: par value per share (in dollars per share)	$0.04	$0.04
Common shares of beneficial interest: authorized shares	250,000,000	250,000,000
Common shares of beneficial interest: issued shares	187,887,498	187,284,688
Common shares of beneficial interest: outstanding shares	187,887,498	187,284,688
Common Class A [Member]
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	11,356,550	11,292,038
Cumulative Redeemable Preferred Unit [Member]
LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS AND EQUITY
Outstanding Partnership Units held by Third Parties	1	1

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES:
Property rentals	$2,110,797	$2,081,115	$1,990,784
Tenant expense reimbursements	329,398	301,167	279,075
Cleveland Medical Mart development project	0	36,369	235,234
Fee and other income	195,745	250,618	144,124
Total revenues	2,635,940	2,669,269	2,649,217
EXPENSES:
Operating	1,064,753	1,030,951	988,883
Depreciation and amortization	536,230	515,724	490,028
General and administrative	185,924	196,267	190,109
Cleveland Medical Mart development project	0	32,210	226,619
Acquisition and transaction related costs, and impairment losses	33,391	43,857	25,786
Total expenses	1,820,298	1,819,009	1,921,425
Operating income	815,642	850,260	727,792
Income from Real Estate Fund	163,034	102,898	63,936
(Loss) income from partially owned entities	-58,131	-338,785	423,126
Interest and debt expense	-467,715	-481,304	-484,794
Interest and other investment income (loss), net	38,787	-24,876	-261,179
Net gain on disposition of wholly owned and partially owned assets	13,568	3,407	13,347
Income before income taxes	505,185	111,600	482,228
Income tax (expense) benefit	-11,002	6,406	-8,132
Income from continuing operations	494,183	118,006	474,096
Income from discontinued operations	514,843	446,734	220,445
Net income	1,009,026	564,740	694,541
Less net income attributable to noncontrolling interests in:
Consolidated subsidiaries	-96,561	-63,952	-32,018
Operating Partnership	-47,563	-23,659	-35,327
Preferred unit distributions of the Operating Partnership	-50	-1,158	-9,936
Net income attributable to Vornado	864,852	475,971	617,260
Preferred share dividends	-81,464	-82,807	-76,937
Preferred unit and share redemptions	0	-1,130	8,948
NET INCOME attributable to common shareholders	783,388	392,034	549,271
INCOME (LOSS) PER COMMON SHARE - BASIC:
Income (loss) from continuing operations, net (in dollars per share)	$1.59	($0.14)	$1.83
Income from discontinued operations, net (in dollars per share)	$2.59	$2.24	$1.12
Net income per common share (in dollars per share)	$4.18	$2.10	$2.95
Weighted average shares outstanding	187,572	186,941	185,810
INCOME (LOSS) PER COMMON SHARE - DILUTED:
Iincome (loss) from continuing operations, net (in dollars per share)	$1.58	($0.14)	$1.82
Income from discontinued operations, net (in dollars per share)	$2.57	$2.23	$1.12
Net income per common share	$4.15	$2.09	$2.94
Weighted average shares outstanding	188,690	187,709	186,530
Toys R Us [Member]
EXPENSES:
(Loss) income from partially owned entities	-73,556	-362,377	14,859
All Equity Method Investees Excluding Toys [Member]
EXPENSES:
(Loss) income from partially owned entities	$15,425	$23,592	$408,267

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$1,009,026	$564,740	$694,541
Other comprehensive income (loss):
Change in unrealized net gain (loss) on securities available-for-sale	14,465	142,281	-283,649
Amounts reclassified from accumulated other comprehensive income:
Non-cash impairment loss on J.C. Penney common shares	0	0	224,937
Sale of available-for-sale securities	0	-42,404	-3,582
Pro rata share of other comprehensive income (loss) of nonconsolidated subsidiaries	2,509	-22,814	-31,758
Change in value of interest rate swap	6,079	18,183	-5,659
Other	0	533	329
Comprehensive income	1,032,079	660,519	595,159
Less comprehensive income attributable to noncontrolling interests	-145,497	-94,065	-70,574
Comprehensive income attributable to Vornado	$886,582	$566,454	$524,585

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)	Total	Series L Preferred Stock [Member]	Series K Preferred Stock [Member]	Series E Preferred Stock [Member]	Series F And Series H Preferred Stock [Member]	Real Estate Fund [Member]	All Other Except Real Estate Fund [Member]	Preferred Shares	Preferred Shares	Preferred Shares	Preferred Shares	Preferred Shares	Common Shares	Additional Capital	Earnings Less Than Distributions	Earnings Less Than Distributions	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests	Non-controlling Interests	Non-controlling Interests
In Thousands, unless otherwise specified									Series L Preferred Stock [Member]	Series K Preferred Stock [Member]	Series E Preferred Stock [Member]	Series F And Series H Preferred Stock [Member]				Series F And Series H Preferred Stock [Member]			Real Estate Fund [Member]	All Other Except Real Estate Fund [Member]
Beginning balance, Value at Dec. 31, 2011	$7,508,447							$1,021,660					$7,373	$7,127,258	($1,401,704)		$73,729	$680,131
Beginning balance, Shares at Dec. 31, 2011								42,187					185,080
Net income attributable to Vornado	617,260														617,260
Net income attributable to noncontrolling interests in consolidated subsidiaries	32,018					39,332												32,018
Dividends on common shares, Value	-699,318														-699,318
Dividends on preferred shares, Value	-76,937														-76,937
Issuance of preferred shares, Shares										12,000
Issuance of preferred shares, Value			290,971							290,971
Redemption of preferred shares, Shares											-3,000
Redemption of preferred shares, Value				-72,248							-72,248
Common shares issued:
Upon redemption of Class A units, at redemption value, Shares													1,121
Upon redemption of Class A units, at redemption value, Value	89,762												45	89,717
Under Omnibus share plan, Shares													434
Under Omnibus share plan, Value	-6,850												18	9,521	-16,389
Under dividend reinvestment plan, Shares													29
Under dividend reinvestment plan, Value	2,307												1	2,306
Upon acquisition of real estate, Shares													64
Upon acquisition of real estate, Value	5,124												3	5,121
Contributions:
Contributions						195,029	18,103												195,029	18,103
Distribution:
Distributions						-48,138	-59												-48,138	-59
Transfer of noncontrolling interest in Real Estate Fund	0
Conversion Of Series A preferred shares to common shares, Shares								-2					3
Conversion of Series A preferred shares to common shares, Value	0							-105					0	105
Deferred compensation shares and options, Shares													4
Deferred compensation shares and options, Value	13,054												0	13,527	-473
Change in unrealized net gain (loss) on securities available-for-sale	-283,649																-283,649
Non-cash impairment loss on J.C. Penney common shares	224,937																224,937
Amounts reclassified related to sale of available-for-sale securities	-3,582																-3,582
Pro rata share of other comprehensive income (loss) of nonconsolidated subsidiaries	-31,758																-31,758
Change in value of interest rate swap	-5,659																-5,659
Adjustments to carry redeemable Class A units at redemption value	-52,117													-52,117
Redeemable noncontrolling interests' share of above adjustments	6,707																6,707
Preferred unit and share redemptions	8,948														8,948
Consolidation of a partially owned entity	176,132																	176,132
Other	-4,340							0						0	-4,662		329	-7
Ending balance, Value at Dec. 31, 2012	7,904,144							1,240,278					7,440	7,195,438	-1,573,275		-18,946	1,053,209
Ending balance, Shares at Dec. 31, 2012								51,185					186,735
Net income attributable to Vornado	475,971														475,971
Net income attributable to noncontrolling interests in consolidated subsidiaries	63,952					53,427												63,952
Dividends on common shares, Value	-545,913														-545,913
Dividends on preferred shares, Value	-82,807														-82,807
Issuance of preferred shares, Shares									12,000
Issuance of preferred shares, Value		290,306							290,306
Redemption of preferred shares, Shares												-10,500
Redemption of preferred shares, Value					-253,269							-253,269				0
Common shares issued:
Upon redemption of Class A units, at redemption value, Shares													299
Upon redemption of Class A units, at redemption value, Value	25,317												12	25,305
Under Omnibus share plan, Shares													104
Under Omnibus share plan, Value	5,808												23	5,892	-107
Under dividend reinvestment plan, Shares													22
Under dividend reinvestment plan, Value	1,851												1	1,850
Upon acquisition of real estate, Shares													128
Upon acquisition of real estate, Value	11,461												5	11,456
Contributions:
Contributions						28,078	15,886												28,078	15,886
Distribution:
Distributions	-34,053					-47,268	-133,153												-47,268	-133,153
Transfer of noncontrolling interest in Real Estate Fund	0
Conversion Of Series A preferred shares to common shares, Shares								-2					3
Conversion of Series A preferred shares to common shares, Value	0							-90					0	90
Deferred compensation shares and options, Shares													-6
Deferred compensation shares and options, Value	9,270												-12	9,589	-307
Change in unrealized net gain (loss) on securities available-for-sale	142,281																142,281
Non-cash impairment loss on J.C. Penney common shares	0
Amounts reclassified related to sale of available-for-sale securities	-42,404																-42,404
Pro rata share of other comprehensive income (loss) of nonconsolidated subsidiaries	-22,814																-22,814
Change in value of interest rate swap	18,183																18,183
Adjustments to carry redeemable Class A units at redemption value	-108,252													-108,252
Redeemable noncontrolling interests' share of above adjustments	-5,296																-5,296
Preferred unit and share redemptions	-1,130														-1,130
Deconsolidation of partially owned entity	-165,427																	-165,427
Consolidation of a partially owned entity	16,799																	16,799
Other	-6,830													2,472	-7,271		533	-2,564
Ending balance, Value at Dec. 31, 2013	7,594,744							1,277,225					7,469	7,143,840	-1,734,839		71,537	829,512
Ending balance, Shares at Dec. 31, 2013								52,683					187,285
Net income attributable to Vornado	864,852														864,852
Net income attributable to noncontrolling interests in consolidated subsidiaries	96,561					92,728												96,561
Dividends on common shares, Value	-547,831														-547,831
Dividends on preferred shares, Value	-81,464														-81,464
Common shares issued:
Upon redemption of Class A units, at redemption value, Shares													271
Upon redemption of Class A units, at redemption value, Value	27,273												11	27,262
Under Omnibus share plan, Shares													304
Under Omnibus share plan, Value	14,047												12	17,428	-3,393
Under dividend reinvestment plan, Shares													17
Under dividend reinvestment plan, Value	1,804												1	1,803	0
Contributions:
Contributions						5,297	32,998												5,297	32,998
Distribution:
Distributions	-33,469					-182,964	-4,463												-182,964	-4,463
Transfer of noncontrolling interest in Real Estate Fund	-33,028																	-33,028
Conversion Of Series A preferred shares to common shares, Shares								-4					5
Conversion of Series A preferred shares to common shares, Value	0							-193						193
Deferred compensation shares and options, Shares													5
Deferred compensation shares and options, Value	5,512												0	5,852	-340
Change in unrealized net gain (loss) on securities available-for-sale	14,465																14,465
Non-cash impairment loss on J.C. Penney common shares	0
Amounts reclassified related to sale of available-for-sale securities	0
Pro rata share of other comprehensive income (loss) of nonconsolidated subsidiaries	2,509																2,509
Change in value of interest rate swap	6,079																6,079
Adjustments to carry redeemable Class A units at redemption value	-315,276													-315,276
Redeemable noncontrolling interests' share of above adjustments	-1,323																-1,323
Preferred unit and share redemptions	0
Other	-10,410							-6						-8,077	-2,370		0	43
Ending balance, Value at Dec. 31, 2014	$7,489,382							$1,277,026					$7,493	$6,873,025	($1,505,385)		$93,267	$743,956
Ending balance, Shares at Dec. 31, 2014								52,679					187,887

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$1,009,026	$564,740	$694,541
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization (including amortization of deferred financing costs)	583,408	561,998	557,888
Net gains on sale of real estate	-507,192	-414,502	-245,799
Return of capital from Real Estate Fund investments	215,676	56,664	63,762
Net realized and unrealized gains on Real Estate Fund investments	-150,139	-85,771	-55,361
Distributions of income from partially owned entities	96,286	54,030	226,172
Straight-lining of rental income	-82,800	-69,391	-69,648
Equity in net loss (income) of partially owned entities, including Toys R Us	58,131	338,785	-423,126
Amortization of below-market leases, net	-46,786	-52,876	-54,359
Other non-cash adjustments	37,303	41,663	52,082
Impairment losses and tenant buy-outs	26,518	37,170	133,977
Net gain on disposition of wholly owned and partially owned assets	-13,568	-3,407	-13,347
Defeasance cost in connection with the refinancing of mortgage notes payable	5,589	0	0
Losses from the disposition of investment in J.C. Penney	0	72,974	300,752
Gain on sale of Canadian Trade Shows	0	0	-31,105
Changes in operating assets and liabilities:
Real Estate Fund investments	-3,392	-37,817	-262,537
Tenant and other receivables, net	-8,282	83,897	-23,271
Prepaid assets	-8,786	-2,207	-10,549
Other assets	-123,435	-50,856	-46,573
Accounts payable and accrued expenses	44,628	-41,729	21,595
Other liabilities	3,125	-12,576	9,955
Net cash provided by operating activities	1,135,310	1,040,789	825,049
Cash Flows from Investing Activities:
Development costs and construction in progress	-544,187	-469,417	-156,873
Additions to real estate	-279,206	-260,343	-205,652
Proceeds from sales of real estate and related investments	388,776	1,027,608	445,683
Acquisitions of real estate and other	-211,354	-193,417	-673,684
Investments in partially owned entities	-120,639	-230,300	-134,994
Restricted cash	99,464	-26,892	-75,138
Proceeds from sales and repayments of mortgage and mezzanine loans receivable and other	96,913	50,569	38,483
Investments in mortgage and mezzanine loans receivable and other	-30,175	-390	-94,094
Distributions of capital from partially owned entities	25,943	290,404	144,502
Proceeds from sales of, and return of investment in, marketable securities	0	378,709	60,258
Proceeds from the sale of LNR	0	240,474	0
Funding of J.C. Penney derivative collateral; and settlement of derivative in 2013	0	-186,079	-191,330
Return of J.C. Penney derivative collateral	0	101,150	134,950
Proceeds from the sale of Canadian Trade Shows	0	0	52,504
Proceeds from the repayment of loan to officer	0	0	13,123
Net cash (used in) provided by investing activities	-574,465	722,076	-642,262
Cash Flows from Financing Activities:
Proceeds from borrowings	2,428,285	2,262,245	3,593,000
Repayments of borrowings	-1,312,258	-3,580,100	-2,747,694
Dividends paid on common shares	-547,831	-545,913	-699,318
Distributions to noncontrolling interests	-220,895	-215,247	-104,448
Purchase of marketable securities in connection with the defeasance of mortgage notes payable	-198,884	0	0
Dividends paid on preferred shares	-81,468	-83,188	-73,976
Debt issuance and other costs	-58,336	-19,883	-39,073
Contributions from noncontrolling interests	30,295	43,964	213,132
Proceeds received from exercise of employee share options	19,245	7,765	11,853
Repurchase of shares related to stock compensation agreements and related tax withholdings	-3,811	-443	-30,168
Purchases of outstanding preferred units and shares	0	-299,400	-243,300
Proceeds from the issuance of preferred shares	0	290,306	290,971
Net Cash provided by (used in) financing activities	54,342	-2,139,894	170,979
Net increase (decrease) in cash and cash equivalents	615,187	-377,029	353,766
Cash and cash equivalents at beginning of period	583,290	960,319	606,553
Cash and cash equivalents at end of period	1,198,477	583,290	960,319
Supplemental Disclosure Of Cash Flow Information:
Cash payments for interest (net of amounts capitalized of $53,139, $42,303, and $16,801	443,538	465,260	491,869
Cash payments for income taxes	11,696	9,023	21,709
Non-Cash Investing and Financing Activities:
Adjustments to carry redeemable Class A units at redemption value	-315,276	-108,252	-52,117
Marketable securities transferred in connection with the defeasance of mortgage notes payable	198,884	0	0
Defeasance of mortgage notes payable	-193,406	0	0
Write-off of fully depreciated assets	-121,673	-77,106	-177,367
Accrued capital expenditures included in accounts payable and accrued expenses	100,528	72,042	80,350
Elimination of a mortgage and mezzanine loan asset and liability	59,375	0	0
Transfer of interest in Real Estate Fund to an unconsolidated joint venture	-58,564	0	0
Transfer of noncontrolling interest in Real Estate Fund	-33,028	0	0
Beverly Connection seller financing	13,620	0	0
Financing assumed in acquisitions	0	79,253	0
Financings transferred in dispositions	0	0	-163,144
L.A. Mart seller financing	0	0	35,000
Marriott Marquis Times Square - retail and signage capital lease:
Asset (included in development costs and construction in progress)	0	0	240,000
Liability (included in other liabilities)	0	0	-240,000
Increase in assets and liabilities resulting from the consolidation of partially owned entities:
Real Estate, net	0	0	342,919
Notes and mortgages payable	0	0	334,225
Decrease in assets and liabilities resulting from deconsolidation of discontinued operations and /or investments that were previously consolidated:
Real estate, Net	0	-852,166	0
Notes and Mortgages Payable	0	-322,903	0
Acquisitions [Member]
Non-Cash Investing and Financing Activities:
Like-kind exchange of real estate	606,816	66,076	230,913
Dispositions [Member]
Non-Cash Investing and Financing Activities:
Like-kind exchange of real estate	($630,352)	($128,767)	($230,913)

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parentheticals) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Cash Flows [Abstract]
Cash paid for capitalized interest	$53,139	$42,303	$16,801

Organization_and_Business

Organization and Business	12 Months Ended
	Dec. 31, 2014
Organization and Business [Abstract]
Organization And Business	1. Organization and Business
	Vornado Realty Trust (“Vornado”) is a fully-integrated real estate investment trust (“REIT”) and conducts its business through, and substantially all of its interests in properties are held by, Vornado Realty L.P., a Delaware limited partnership (the “Operating Partnership”). Accordingly, Vornado's cash flow and ability to pay dividends to its shareholders is dependent upon the cash flow of the Operating Partnership and the ability of its direct and indirect subsidiaries to first satisfy their obligations to creditors. Vornado is the sole general partner of, and owned approximately 94.1% of the common limited partnership interest in the Operating Partnership at December 31, 2014. All references to “we,” “us,” “our,” the “Company” and “Vornado” refer to Vornado Realty Trust and its consolidated subsidiaries, including the Operating Partnership.
	On January 15, 2015, we completed the spin-off of substantially all of our retail segment comprised of 79 strip shopping centers, three malls, a warehouse park and $225 million of cash to Urban Edge Properties (“UE”) (NYSE: UE). As part of this transaction, we received 5,712,000 UE operating partnership units (5.4% ownership interest). We are providing transition services to UE for an initial period of up to two years, including information technology, human resources, tax and public reporting. UE is providing us with leasing and property management services for (i) the Monmouth Mall, (ii) certain small retail properties which did not fit UE's strategy that we plan to sell, and (iii) our affiliate, Alexander's, Inc. (NYSE: ALX), Rego Park retail assets. Steven Roth, our Chairman and Chief Executive Officer is a member of the Board of Trustees of UE. The spin-off distribution was effected by Vornado distributing one UE common share for every two Vornado common shares. Beginning in the first quarter of 2015, the historical financial results of UE will be reflected in our consolidated financial statements as discontinued operations for all periods presented.
	We currently own all or portions of:
	New York:
	20.1 million square feet of Manhattan office space in 31 properties;
	2.5 million square feet of Manhattan street retail space in 56 properties;
	Four residential properties containing 1,654 units;
	The 1,700 room Hotel Pennsylvania located on Seventh Avenue at 33rd Street in the heart of the Penn Plaza district;
	A 32.4% interest in Alexander's, Inc. (NYSE: ALX), which owns six properties in the greater New York metropolitan area, including 731 Lexington Avenue, the 1.3 million square foot Bloomberg, L.P. headquarters building;
	Washington, DC:
	16.1 million square feet of office space in 59 properties;
	Seven residential properties containing 2,414 units;
	Other Real Estate and Related Investments:
	The 3.6 million square foot Mart in Chicago;
	A 70% controlling interest in 555 California Street, a three-building office complex in San Francisco's financial district aggregating 1.8 million square feet, known as the Bank of America Center;
	A 25.0% interest in Vornado Capital Partners, our real estate fund. We are the general partner and investment manager of the fund;
	A 32.6% interest in Toys “R” Us, Inc.; and
	Other real estate and related investments.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Basis of Presentation and Significant Accounting Policies [Abstract]
Basis Of Presentation And Significant Accounting Policies	2. Basis of Presentation and Significant Accounting Policies
	Basis of Presentation
	The accompanying consolidated financial statements include the accounts of Vornado and its consolidated subsidiaries, including the Operating Partnership. All inter-company amounts have been eliminated. Our consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America, which require us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
	Recently Issued Accounting Literature
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued an update (“ASU 2014-08”) Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity to ASC Topic 205, Presentation of Financial Statements and ASC Topic 360, Property Plant and Equipment. Under ASU 2014-08, only disposals that represent a strategic shift that has (or will have) a major effect on the entity's results and operations would qualify as discontinued operations. In addition, ASU 2014-08 expands the disclosure requirements for disposals that meet the definition of a discontinued operation and requires entities to disclose information about disposals of individually significant components that do not meet the definition of discontinued operations. ASU 2014-08 is effective for interim and annual reporting periods in fiscal years that begin after December 15, 2014. Upon adoption of this standard, individual properties sold in the ordinary course of business are not expected to qualify as discontinued operations. The financial results of our strip shopping centers and malls, which were spun off to UE on January 15, 2015, will be treated as a discontinued operation in the first quarter of 2015.
	In May 2014, the FASB issued an update ("ASU 2014-09") establishing ASC Topic 606, Revenue from Contracts with Customers. ASU 2014-09 establishes a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most of the existing revenue recognition guidance. ASU 2014-09 requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services and also requires certain additional disclosures. ASU 2014-09 is effective for interim and annual reporting periods in fiscal years that begin after December 15, 2016. We are currently evaluating the impact of the adoption of ASU 2014-09 on our consolidated financial statements.
	In June 2014, the FASB issued an update (“ASU 2014-12”) to ASC Topic 718, Compensation – Stock Compensation. ASU 2014-12 requires an entity to treat performance targets that can be met after the requisite service period of a share based award has ended, as a performance condition that affects vesting. ASU 2014-12 is effective for interim and annual reporting periods in fiscal years that begin after December 15, 2015. We are currently evaluating the impact of the adoption of ASU 2014-12 on our consolidated financial statements.
	2. Basis of Presentation and Significant Accounting Policies - continued
	Significant Accounting Policies
	Real Estate: Real estate is carried at cost, net of accumulated depreciation and amortization. Betterments, major renewals and certain costs directly related to the improvement and leasing of real estate are capitalized. Maintenance and repairs are expensed as incurred. For redevelopment of existing operating properties, the net book value of the existing property under redevelopment plus the cost for the construction and improvements incurred in connection with the redevelopment are capitalized to the extent the capitalized costs of the property do not exceed the estimated fair value of the redeveloped property when complete. If the cost of the redeveloped property, including the net book value of the existing property, exceeds the estimated fair value of redeveloped property, the excess is charged to expense. Depreciation is recognized on a straight-line basis over estimated useful lives which range from 7 to 40 years. Tenant allowances are amortized on a straight-line basis over the lives of the related leases, which approximate the useful lives of the assets. Additions to real estate include interest and debt expense capitalized during construction of $62,786,000 and $42,303,000 for the years ended December 31, 2014 and 2013, respectively.
	Upon the acquisition of real estate, we assess the fair value of acquired assets (including land, buildings and improvements, identified intangibles, such as acquired above and below-market leases, acquired in-place leases and tenant relationships) and acquired liabilities and we allocate the purchase price based on these assessments. We assess fair value based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including historical operating results, known trends, and market/economic conditions. We record acquired intangible assets (including acquired above-market leases, acquired in-place leases and tenant relationships) and acquired intangible liabilities (including below–market leases) at their estimated fair value separate and apart from goodwill. We amortize identified intangibles that have finite lives over the period they are expected to contribute directly or indirectly to the future cash flows of the property or business acquired.
	Our properties, including any related intangible assets, are individually reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment exists when the carrying amount of an asset exceeds the aggregate projected future cash flows over the anticipated holding period on an undiscounted basis. An impairment loss is measured based on the excess of the property's carrying amount over its estimated fair value. Impairment analyses are based on our current plans, intended holding periods and available market information at the time the analyses are prepared. If our estimates of the projected future cash flows, anticipated holding periods, or market conditions change, our evaluation of impairment losses may be different and such differences could be material to our consolidated financial statements. The evaluation of anticipated cash flows is subjective and is based, in part, on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results. Plans to hold properties over longer periods decrease the likelihood of recording impairment losses.
	The table below summarizes impairment losses, acquisition related costs and tenant buy-outs in the years ended December 31, 2014, 2013 and 2012.
		(Amounts in thousands)			For the Year Ended December 31,
					2014			2013			2012
		Impairment losses		$	-		$	19,000		$	14,538
		Acquisition related costs			33,391			24,857	(1)		11,248
				$	33,391		$	43,857		$	25,786
		-1	Includes a $10,949 prepayment penalty in connection with the repayment of the mortgage loan upon the acquisition of 655 Fifth Avenue.
	2. Basis of Presentation and Significant Accounting Policies – continued
	Partially Owned Entities: We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members as well as whether the entity is a variable interest entity (“VIE”) and we are the primary beneficiary. We are deemed to be the primary beneficiary of a VIE when we have (i) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (ii) the obligation to absorb losses or receive benefits that could potentially be significant to the VIE. We generally do not control a partially owned entity if the entity is not considered a VIE and the approval of all of the partners/members is contractually required with respect to major decisions, such as operating and capital budgets, the sale, exchange or other disposition of real property, the hiring of a chief executive officer, the commencement, compromise or settlement of any lawsuit, legal proceeding or arbitration or the placement of new or additional financing secured by assets of the venture. We account for investments under the equity method when the requirements for consolidation are not met, and we have significant influence over the operations of the investee. Equity method investments are initially recorded at cost and subsequently adjusted for our share of net income or loss and cash contributions and distributions each period. Investments that do not qualify for consolidation or equity method accounting are accounted for on the cost method.
	Investments in partially owned entities are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is measured based on the excess of the carrying amount of an investment over its estimated fair value. Impairment analyses are based on current plans, intended holding periods and available information at the time the analyses are prepared. In the years ended December 31, 2014, 2013 and 2012, we recognized non-cash impairment losses on investments in partially owned entities, aggregating $85,459,000, $281,098,000 and $44,936,000, respectively. Included in these amounts are $75,196,000, $240,757,000 and $40,000,000 of impairment losses related to our investment in Toys in 2014, 2013 and 2012, respectively.
	Mortgage and Mezzanine Loans Receivable: We invest in mortgage and mezzanine loans of entities that have significant real estate assets. These investments are either secured by the real property or by pledges of the equity interests of the entities owning the underlying real estate. We record these investments at the stated principal amount net of any unamortized discount or premium. We accrete or amortize any discount or premium over the life of the related receivable utilizing the effective interest method or straight-line method, if the result is not materially different. We evaluate the collectibility of both interest and principal of each of our loans whenever events or changes in circumstances indicate such amounts may not be recoverable. A loan is impaired when it is probable that we will be unable to collect all amounts due according to the existing contractual terms. When a loan is impaired, the amount of the loss accrual is calculated by comparing the carrying amount of the investment to the present value of expected future cash flows discounted at the loan's effective interest rate, or as a practical expedient, to the value of the collateral if the loan is collateral dependent. Interest on impaired loans is recognized when received in cash. Mortgage and mezzanine loans receivable are included in “other assets” on our consolidated balance sheets.
	Cash and Cash Equivalents: Cash and cash equivalents consist of highly liquid investments with original maturities of three months or less and are carried at cost, which approximates fair value due to their short-term maturities. The majority of our cash and cash equivalents consists of (i) deposits at major commercial banks, which may at times exceed the Federal Deposit Insurance Corporation limit, (ii) United States Treasury Bills, and (iii) Certificate of Deposits placed through an Account Registry Service (“CDARS”). To date, we have not experienced any losses on our invested cash.
	Restricted Cash: Restricted cash consists of security deposits, cash restricted for the purposes of facilitating a Section 1031 Like-Kind exchange, cash restricted in connection with our deferred compensation plan and cash escrowed under loan agreements for debt service, real estate taxes, property insurance and capital improvements.
	2. Basis of Presentation and Significant Accounting Policies – continued
	Allowance for Doubtful Accounts: We periodically evaluate the collectibility of amounts due from tenants and maintain an allowance for doubtful accounts for estimated losses resulting from the inability of tenants to make required payments under the lease agreements. We also maintain an allowance for receivables arising from the straight-lining of rents. This receivable arises from earnings recognized in excess of amounts currently due under the lease agreements. Management exercises judgment in establishing these allowances and considers payment history and current credit status in developing these estimates. As of December 31, 2014 and 2013, we had $17,060,000 and $21,869,000, respectively, in allowances for doubtful accounts. In addition, as of December 31, 2014 and 2013, we had $3,188,000 and $4,355,000, respectively, in allowances for receivables arising from the straight-lining of rents.
	Deferred Charges: Direct financing costs are deferred and amortized over the terms of the related agreements as a component of interest expense. Direct costs related to successful leasing activities are capitalized and amortized on a straight line basis over the lives of the related leases. All other deferred charges are amortized on a straight line basis, which approximates the effective interest rate method, in accordance with the terms of the agreements to which they relate.
	Revenue Recognition: We have the following revenue sources and revenue recognition policies:
	•       Base Rent — income arising from tenant leases. These rents are recognized over the non-cancelable term of the related leases on a straight-line basis which includes the effects of rent steps and rent abatements under the leases. We commence rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. In addition, in circumstances where we provide a tenant improvement allowance for improvements that are owned by the tenant, we recognize the allowance as a reduction of rental revenue on a straight-line basis over the term of the lease.
	•       Percentage Rent — income arising from retail tenant leases that is contingent upon tenant sales exceeding defined thresholds. These rents are recognized only after the contingency has been removed (i.e., when tenant sales thresholds have been achieved).
	•       Hotel Revenue — income arising from the operation of the Hotel Pennsylvania which consists of rooms revenue, food and beverage revenue, and banquet revenue. Income is recognized when rooms are occupied. Food and beverage and banquet revenue is recognized when the services have been rendered.
	•       Trade Shows Revenue — income arising from the operation of trade shows, including rentals of booths. This revenue is recognized when the trade shows have occurred.
	•       Expense Reimbursements — revenue arising from tenant leases which provide for the recovery of all or a portion of the operating expenses and real estate taxes of the respective property. This revenue is accrued in the same periods as the expenses are incurred.
	•       Management, Leasing and Other Fees — income arising from contractual agreements with third parties or with partially owned entities. This revenue is recognized as the related services are performed under the respective agreements.
	•       Cleveland Medical Mart — revenue arising from the development of the Cleveland Medical Mart. This revenue was recognized as the related services were performed under the respective agreements using the criteria set forth in ASC 605-25, Multiple Element Arrangements
	2. Basis of Presentation and Significant Accounting Policies – continued
	Derivative Instruments and Hedging Activities: ASC 815, Derivatives and Hedging, as amended, establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other contracts, and for hedging activities. As of December 31, 2014 and 2013, our derivative instruments consisted of an interest rate cap and an interest rate swap. We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the resulting designation. Derivatives used to hedge the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives used to hedge the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.
	For derivatives designated as fair value hedges, changes in the fair value of the derivative and the hedged item related to the hedged risk are recognized in earnings. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is initially reported in other comprehensive income (loss) (outside of earnings) and subsequently reclassified to earnings when the hedged transaction affects earnings, and the ineffective portion of changes in the fair value of the derivative is recognized directly in earnings. We assess the effectiveness of each hedging relationship by comparing the changes in fair value or cash flows of the derivative hedging instrument with the changes in fair value or cash flows of the designated hedged item or transaction. For derivatives not designated as hedges, changes in fair value are recognized in earnings.
	Income Taxes: We operate in a manner intended to enable us to continue to qualify as a REIT under Sections 856-860 of the Internal Revenue Code of 1986, as amended. Under those sections, a REIT which distributes at least 90% of its REIT taxable income as a dividend to its shareholders each year and which meets certain other conditions will not be taxed on that portion of its taxable income which is distributed to its shareholders. We distribute to our shareholders 100% of our taxable income and therefore, no provision for Federal income taxes is required. Dividends distributed for the years ended December 31, 2014 and 2013, were characterized, for federal income tax purposes, as ordinary income. Dividend distributions for the year ended December 31, 2012, were characterized, for Federal income tax purposes, as 62.7% ordinary income and 37.3% long-term capital gain.
	We have elected to treat certain consolidated subsidiaries, and may in the future elect to treat newly formed subsidiaries, as taxable REIT subsidiaries pursuant to an amendment to the Internal Revenue Code that became effective January 1, 2001. Taxable REIT subsidiaries may participate in non-real estate related activities and/or perform non-customary services for tenants and are subject to Federal and State income tax at regular corporate tax rates. Our taxable REIT subsidiaries had a combined current income tax expense of approximately $10,777,000, $9,608,000 and $20,336,000 for the years ended December 31, 2014, 2013 and 2012, respectively, and have immaterial differences between the financial reporting and tax basis of assets and liabilities.
	At December 31, 2014 and 2013, we had deferred tax assets from our taxable REIT subsidiaries of $94,100,000 and $87,800,000, respectively, against which we have recorded a full valuation allowance because we have not determined that it is more likely than not that we will realize these net operating loss carryforwards which expire in 2034. The year over year change in the valuation allowance relates to an increase in the net operating loss carryforwards.
	The following table reconciles net income attributable to common shareholders to estimated taxable income for the years ended December 31, 2014, 2013 and 2012.
		(Amounts in thousands)			For the Year Ended December 31,
					2014		2013			2012
		Net income attributable to common shareholders		$	783,388	$	392,034		$	549,271
		Book to tax differences (unaudited):
			Depreciation and amortization		219,403		155,401			205,155
			Impairment losses on marketable equity securities		-		37,236			211,328
			Straight-line rent adjustments		-77,526		-64,811			-64,679
			Earnings of partially owned entities		71,960		339,376			-60,049
			Stock options		-9,566		4,884			-28,701
			Sale of real estate		-477,061		-324,936			-123,905
			Derivatives		-		31,578			71,228
			Other, net		1,260		4,608			17,080
		Estimated taxable income (unaudited)		$	511,858	$	575,370		$	776,728
	The net basis of our assets and liabilities for tax reporting purposes is approximately $3.6 billion lower than the amounts reported in our consolidated balance sheet at December 31, 2014.

Vornado_Capital_Partners_Real_

Vornado Capital Partners Real Estate Fund (the "Fund")	12 Months Ended
	Dec. 31, 2014
Real Estate Fund [Abstract]
Vornado Capital Partners Real Estate Fund (the "Fund")	3. Vornado Capital Partners Real Estate Fund (the “Fund”)
	We are the general partner and investment manager of the Fund, which has an eight-year term and a three-year investment period that ended in July 2013. During the investment period, the Fund was our exclusive investment vehicle for all investments that fit within its investment parameters, as defined. The Fund is accounted for under the AICPA Investment Company Guide and its investments are reported on its balance sheet at fair value, with changes in value each period recognized in earnings. We consolidate the accounts of the Fund into our consolidated financial statements, retaining the fair value basis of accounting.
	On June 26, 2014, the Fund sold its 64.7% interest in One Park Avenue to a newly formed joint venture that we and an institutional investor own 55% and 45%, respectively (see Note 6 - Investments in Partially Owned Entities - One Park Avenue). This transaction was based on a property value of $560,000,000. From the inception of this investment through its disposition, the Fund realized a $75,529,000 net gain.
	On August 21, 2014, the Fund and its 50% joint venture partner completed the sale of The Shops at Georgetown Park, a 305,000 square foot retail property, for $272,500,000. From the inception of this investment through its disposition, the Fund realized a $51,124,000 net gain.
	On January 20, 2015, we co-invested with the Fund and one of the Fund's limited partners to buy out the Fund's joint venture partner's 57% interest in the Crowne Plaza Times Square Hotel.  The purchase price for the 57% interest was approximately $95,000,000 (our share $39,000,000) which valued the property at approximately $480,000,000. The property is encumbered by a newly placed $310,000,000 mortgage loan bearing interest at LIBOR plus 2.80% and maturing in December 2018 with a one-year extension option. Our aggregate ownership interest in the property increased to 33% from 11%.
	At December 31, 2014, the Fund had seven investments with an aggregate fair value of $513,973,000, or $176,899,000 in excess of cost, and had remaining unfunded commitments of $144,123,000, of which our share was $36,031,000. At December 31, 2013, the Fund had nine investments with an aggregate fair value of $667,710,000.
	Below is a summary of income from the Fund for the years ended December 31, 2014, 2013 and 2012:
	(Amounts in thousands)		For the Year Ended December 31,
			2014		2013		2012
	Net investment income		$	12,895	$	8,943	$	8,575
	Net realized gains			76,337		8,184		-
	Net unrealized gains			73,802		85,771		55,361
	Income from Real Estate Fund			163,034		102,898		63,936
	Less income attributable to noncontrolling interests			-92,728		-53,427		-39,332
	Income from Real Estate Fund attributable to Vornado (1)		$	70,306	$	49,471	$	24,604
	-1	Excludes $2,865, $2,992, and $3,278 of management and leasing fees in the years ended December 31, 2014, 2013 and 2012, respectively, which are included as a component of "fee and other income" on our consolidated statements of income.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	4. Acquisitions
	On August 1, 2014, we acquired the land under our 715 Lexington Avenue retail property located on the Southeast corner of 58th Street and Lexington Avenue in Manhattan, for $63,000,000.
	On October 28, 2014, we completed the purchase of the retail condominium of the St. Regis Hotel for $700,000,000. We own a 74.3% controlling interest of the joint venture which owns the property. The acquisition was used in a like-kind exchange for income tax purposes for the sale of 1740 Broadway (see Note 8 – Dispositions). We consolidate the accounts of the venture into our consolidated financial statements from the date of acquisition.
	On November 21, 2014, we entered into an agreement to acquire the Center Building, an eight story 437,000 square foot office building, located at 33-00 Northern Boulevard in Long Island City, New York. The building is 98% leased. The purchase price is approximately $142,000,000, including the assumption of an existing $62,000,000 4.43% mortgage maturing in October 2018. The purchase is expected to close in the first quarter of 2015, subject to customary closing conditions. As of December 31, 2014, our $14,200,000 non-refundable deposit was included in “other assets” on our consolidated balance sheet.
	On January 20, 2015, we co-invested with our 25% owned Fund and one of the Fund's limited partners to acquire the Fund's joint venture partner's 57% interest in the Crowne Plaza Times Square Hotel (see Note 3 – Vornado Capital Partners Real Estate Fund).

Marketable_Securities_and_Deri

Marketable Securities and Derivative Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Marketable Securities [Abstract]
Derivative Instrument and Marketable Securities	5. Marketable Securities and Derivative Instruments
	Our portfolio of marketable securities is comprised of equity securities that are classified as available-for-sale. Available-for-sale securities are presented on our consolidated balance sheets at fair value. Unrealized gains and losses resulting from the mark-to-market of these securities are included in “other comprehensive income (loss).” Realized gains and losses are recognized in earnings only upon the sale of the securities and are recorded based on the weighted average cost of such securities.
	We evaluate our portfolio of marketable securities for impairment each reporting period. For each of the securities in our portfolio with unrealized losses, we review the underlying cause of the decline in value and the estimated recovery period, as well as the severity and duration of the decline. In our evaluation, we consider our ability and intent to hold these investments for a reasonable period of time sufficient for us to recover our cost basis. We also evaluate the near-term prospects for each of these investments in relation to the severity and duration of the decline.
		Below is a summary of our marketable securities portfolio as of December 31, 2014 and 2013.
			As of December 31, 2014						As of December 31, 2013
					GAAP		Unrealized				GAAP		Unrealized
			Fair Value		Cost		Gain		Fair Value		Cost		Gain
	Equity securities:
		Lexington Realty Trust	$	202,789	$	72,549	$	130,240	$	188,567	$	72,549	$	116,018
		Other		3,534		-		3,534		3,350		59		3,291
			$	206,323	$	72,549	$	133,774	$	191,917	$	72,608	$	119,309
	Investment in Lexington Realty Trust (“Lexington”) (NYSE: LXP)
	From the inception of our investment in Lexington in 2008, until the first quarter of 2013, we accounted for our investment under the equity method because of our ability to exercise significant influence over Lexington's operating and financial policies. As a result of Lexington's common share issuances, our ownership interest was reduced over time from approximately 17.2% to 8.8% at March 31, 2013. In the first quarter of 2013, we concluded that we no longer have the ability to exercise significant influence over Lexington's operating and financial policies, and began accounting for this investment as a marketable equity security – available for sale, in accordance with ASC Topic 320, Investments – Debt and Equity Securities.
	Investment in J.C. Penney Company, Inc. (“J.C. Penney”) (NYSE: JCP)
	In the first quarter of 2013, we wrote down 8,584,010 J.C. Penney common shares we owned to fair value, based on J.C. Penney's March 31, 2013 closing share price of $15.11 per share, and recorded a $39,487,000 impairment loss. On September 19, 2013, we settled a forward contract and received 4,815,990 J.C. Penney common shares. In connection therewith, we recognized a $33,487,000 loss from the mark-to-market of the derivative position through its settlement date. These losses are included in “interest and other investment income (loss), net” on our consolidated statements of income.
	In March 2013 and September 2013, we sold an aggregate of 23,400,000 J.C. Penney common shares at a price of $14.29 per share, or $334,500,000, resulting in a net loss of $54,914,000. The net losses resulting from these sales are included in “net gain on disposition of wholly owned and partially owned assets” on our consolidated statements of income.
	Other Investments
	During 2013 and 2012, we sold other marketable securities for aggregate proceeds of $44,209,000 and $58,718,000, respectively, resulting in net gains of $31,741,000 and $3,582,000, respectively, which are included as a component of “net gain on disposition of wholly owned and partially owned assets” on our consolidated statements of income.

Investments_in_Partially_Owned

Investments in Partially Owned Entities	12 Months Ended
	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Investments in Partially Owned Entities	6. Investments in Partially Owned Entities
	Toys “R” Us (“Toys”)
	As of December 31, 2014, we own 32.6% of Toys. We account for our investment in Toys under the equity method and record our share of Toys' net income or loss on a one-quarter lag basis because Toys' fiscal year ends on the Saturday nearest January 31, and our fiscal year ends on December 31. The business of Toys is highly seasonal and substantially all of Toys' net income is generated in its fourth quarter.
	We have not guaranteed any of Toys' obligations and are not committed to provide any support to Toys.  Pursuant to ASC 323-10-35-20, we discontinued applying the equity method for our Toys' investment when the carrying amount was reduced to zero in the third quarter of 2014. We will resume application of the equity method if during the period the equity method was suspended our share of unrecognized net income exceeds our share of unrecognized net losses.
	In the first quarter of 2013, we recognized our share of Toys' fourth quarter net income of $78,542,000 and a corresponding non-cash impairment loss of the same amount to continue to carry our investment at fair value.
	At December 31, 2013, we estimated that the fair value of our investment in Toys was approximately $80,062,000 ($83,224,000 including $3,162,000 for our share of Toys' accumulated other comprehensive income), or $162,215,000 less than the carrying amount after recognizing our share of Toys' third quarter net loss in our fourth quarter. In determining the fair value of our investment, we considered, among other inputs, a December 31, 2013 third-party valuation of Toys. As of December 31, 2013, we have concluded that the decline in the value of our investment was “other-than-temporary” based on, among other factors, Toys' 2013 holiday sales results, compression of earnings multiples of comparable retailers and our inability to forecast a recovery in the near term. Accordingly, we recognized an additional non-cash impairment loss of $162,215,000 in the fourth quarter of 2013.
	In the first quarter of 2014, we recognized our share of Toys' fourth quarter net income of $75,196,000 and a corresponding non-cash impairment loss of the same amount to continue to carry our investment at fair value.
	Below is a summary of Toys' latest available financial information on a purchase accounting basis:
		(Amounts in thousands)						Balance as of
		Balance Sheet:						1-Nov-14			2-Nov-13
			Assets					$	11,267,000		$	11,756,000
			Liabilities						10,377,000			10,437,000
			Noncontrolling interests						82,000			75,000
			Toys “R” Us, Inc. equity (1)						808,000			1,244,000
					For the Twelve Months Ended
		Income Statement:			1-Nov-14			2-Nov-13			27-Oct-12
			Total revenues		$	12,645,000		$	13,046,000		$	13,698,000
			Net (loss) income attributable to Toys			-343,000			-396,000			138,000
		-1		At December 31, 2014, the carrying amount of our investment in Toys is less than our share of Toys' equity by approximately $263,455. This basis difference results primarily from non-cash impairment losses aggregating $355,953 that we have recognized through December 31, 2014. We have allocated the basis difference primarily to Toys' real estate, which is being amortized over its remaining estimated useful life.
	Alexander's, Inc. (“Alexander's”) (NYSE: ALX)
	As of December 31, 2014, we own 1,654,068 Alexander's common shares, or approximately 32.4% of Alexander's common equity. We manage, lease and develop Alexander's properties pursuant to agreements which expire in March of each year and are automatically renewable.
	6. Investments in Partially Owned Entities – continued
	Alexander's, Inc. (“Alexander's”) (NYSE: ALX) - continued
	As of December 31, 2014 the market value (“fair value” pursuant to ASC 820) of our investment in Alexander's, based on Alexander's December 31, 2014 closing share price of $437.18, was $723,125,000, or $591,509,000 in excess of the carrying amount on our consolidated balance sheet. As of December 31, 2014, the carrying amount of our investment in Alexander's, excluding amounts owed to us, exceeds our share of the equity in the net assets of Alexander's by approximately $42,048,000. The majority of this basis difference resulted from the excess of our purchase price for the Alexander's common stock acquired over the book value of Alexander's net assets. Substantially all of this basis difference was allocated, based on our estimates of the fair values of Alexander's assets and liabilities, to real estate (land and buildings). We are amortizing the basis difference related to the buildings into earnings as additional depreciation expense over their estimated useful lives. This depreciation is not material to our share of equity in Alexander's net income. The basis difference related to the land will be recognized upon disposition of our investment.
	Management, Leasing and Development Agreements
	We receive an annual fee for managing Alexander's and all of its properties equal to the sum of (i) $2,800,000, (ii) 2% of the gross revenue from the Rego Park II Shopping Center, (iii) $0.50 per square foot of the tenant-occupied office and retail space at 731 Lexington Avenue, and (iv) $280,000, escalating at 3% per annum, for managing the common area of 731 Lexington Avenue. In addition, we are entitled to a development fee of 6% of development costs, as defined.
	We provide Alexander's with leasing services for a fee of 3% of rent for the first ten years of a lease term, 2% of rent for the eleventh through twentieth year of a lease term and 1% of rent for the twenty-first through thirtieth year of a lease term, subject to the payment of rents by Alexander's tenants. In the event third-party real estate brokers are used, our fee increases by 1% and we are responsible for the fees to the third-parties. We are also entitled to a commission upon the sale of any of Alexander's assets equal to 3% of gross proceeds, as defined, for asset sales less than $50,000,000, and 1% of gross proceeds, as defined, for asset sales of $50,000,000 or more. The total of these amounts was payable to us in annual installments in an amount not to exceed $4,000,000 with interest on the unpaid balance at one-year LIBOR plus 1.0% (1.58% at December 31, 2014).
	On December 22, 2014, the leasing agreements with Alexander's were amended to eliminate the annual installment cap of $4,000,000. In addition, Alexander's repaid to us the outstanding balance of $40,353,000.
	On January 15, 2015, we completed the spin-off of 79 strip shopping centers, three malls, a warehouse park and $225,000,000 of cash to UE and the transfer of all of the employees responsible for the management and leasing of those assets. In addition, we entered into agreements with UE to provide management and leasing services, on our behalf, for Alexander's Rego Park retail assets. Fees for these services are similar to the fees we are receiving from Alexander's described above.
	Other Agreements
	Building Maintenance Services (“BMS”), our wholly-owned subsidiary, supervises (i) cleaning, engineering and security services at Alexander's 731 Lexington Avenue property and (ii) security services at Alexander's Rego Park I and Rego Park II properties, for an annual fee of the costs for such services plus 6%. During the years ended December 31, 2014, 2013 and 2012, we recognized $2,318,000, $2,036,000 and $2,362,000 of income, respectively, under these agreements.
	Below is a summary of Alexander's latest available financial information:
		(Amounts in thousands)								Balance as of December 31,
		Balance Sheet:								2014			2013
			Assets							$	1,423,000		$	1,458,000
			Liabilities								1,075,000			1,124,000
			Stockholders' equity								348,000			334,000
							For the Year Ended December 31,
		Income Statement:					2014			2013			2012
			Total revenues				$	201,000		$	196,000		$	191,000
			Net income attributable to Alexander’s (1)					68,000			57,000			674,000
		-1	2012 includes a $600,000 net gain on sale of real estate.
	6. Investments in Partially Owned Entities – continued
	LNR Property LLC (“LNR”)
	In January 2013, we and the other equity holders of LNR entered into a definitive agreement to sell LNR for $1.053 billion, of which our share of the net proceeds was $240,474,000. The definitive agreement provided that LNR would not (i) make any cash distributions to the equity holders, including us, through the completion of the sale, which occurred on April 19, 2013, and (ii) take any of the following actions (among others) without the purchaser's approval, the lending or advancing of any money, the acquisition of assets in excess of specified amounts, or the issuance of equity interests. Notwithstanding the terms of the definitive agreement, in accordance with GAAP, we recorded our pro rata share of LNR's earnings on a one-quarter lag basis through the date of sale, which increased the carrying amount of our investment in LNR above our share of the net sales proceeds and resulted in us recognizing a $27,231,000 “other-than-temporary” impairment loss on our investment in the three months ended March 31, 2013.
	One Park Avenue
	On June 26, 2014, we invested an additional $22,700,000 to increase our ownership in One Park Avenue to 55.0% from 46.5% through a joint venture with an institutional investor, who increased its ownership interest to 45.0% (see Note 3 – Vornado Capital Partners Real Estate Fund). The transaction was based on a property value of $560,000,000. The property is encumbered by a $250,000,000 interest-only mortgage loan that bears interest at 4.995% and matures in March 2016. We account for our investment in the joint venture under the equity method because we share control over major decisions with our joint venture partner.
	61 Ninth Avenue
	On July 23, 2014, a joint venture in which we are a 50.1% partner entered into a 99-year ground lease for 61 Ninth Avenue located on the Southwest corner of Ninth Avenue and 15th Street in Manhattan. The venture's current plans are to construct an office building, with retail at the base, of approximately 130,000 square feet. Total development costs are currently estimated to be approximately $125,000,000. We account for our investment in the joint venture under the equity method because we share control over major decisions with our joint venture partner.
	The following is a summary of condensed combined financial information for all of our partially owned entities, including Toys, Alexander's and LNR (sold in April 2013), as of December 31, 2014 and 2013 and for the years ended December 31, 2014, 2013 and 2012.
		(Amounts in thousands)						Balance as of December 31,
		Balance Sheet:						2014			2013
			Assets					$	21,389,000		$	21,773,000
			Liabilities						17,986,000			17,982,000
			Noncontrolling interests						104,000			96,000
			Equity						3,299,000			3,695,000
					For the Year Ended December 31,
		Income Statement:			2014			2013			2012
			Total revenue		$	13,620,000		$	14,092,000		$	15,119,000
			Net (loss) income(1)			-434,000			-368,000			1,091,000
		-1	2012 includes a $600,000 net gain on sale of real estate.
	6. Investments in Partially Owned Entities - continued
	Below are schedules summarizing our investments in, and income from, partially owned entities.
										Percentage
(Amounts in thousands)									Ownership at		As of December 31,
Investments:									31-Dec-14		2014			2013
	Toys								32.60%		$	-		$	83,224
	Alexander’s								32.40%		$	131,616		$	167,785
	India real estate ventures								4.1%-36.5%			76,752			88,467
	Partially owned office buildings (1)								Various			760,749			621,294
	Other investments (2)								Various			277,379			288,897
											$	1,246,496		$	1,166,443
______________________________________________________
-1			Includes interests in 280 Park Avenue, 650 Madison Avenue, One Park Avenue, 666 Fifth Avenue (Office), 330 Madison Avenue and others.
-2			Includes interests in Independence Plaza, Monmouth Mall, 85 Tenth Avenue, Fashion Center Mall, 50-70 West 93rd Street and others.
						Percentage
(Amounts in thousands)						Ownership at			For the Year Ended December 31,
Our Share of Net (Loss) Income:						31-Dec-14			2014			2013			2012
	Toys:
		Equity in net (loss) earnings					32.60%		$	-4,691		$	-128,919		$	45,267
		Non-cash impairment losses (see page 113 for details)								-75,196			-240,757			-40,000
		Management fees								6,331			7,299			9,592
									$	-73,556		$	-362,377		$	14,859
	Alexander's:
		Equity in net income					32.40%		$	21,287		$	17,721		$	24,709
		Management, leasing and development fees								8,722			6,681			13,748
		Net gain on sale of real estate								-			-			179,934
										30,009			24,402			218,391
	India real estate ventures (1)						4.1%-36.5%			-8,309			-3,533			-5,008
	Partially owned office buildings (2)						Various			93			-4,212			-3,770
	Other investments (3)						Various			-6,368			-10,817			103,644
	LNR (see page 115 for details):
		Equity in net income					n/a			-			42,186			66,270
		Impairment loss								-			-27,231			-
		Net gain on sale								-			3,776			-
										-			18,731			66,270
	Lexington (see page 112 for details): (4)						n/a
		Equity in net loss								-			-979			-23
		Net gain resulting from Lexington's stock issuance and asset
			acquisition							-			-			28,763
										-			-979			28,740
									$	15,425		$	23,592		$	408,267
______________________________________________________
-1			Includes a $5,771 non-cash impairment loss in 2014.
-2			Includes interests in 280 Park Avenue, 650 Madison Avenue, One Park Avenue, 666 Fifth Avenue (Office), 330 Madison Avenue and others.
-3			Includes interests in Independence Plaza, Monmouth Mall, 85 Tenth Avenue, Fashion Center Mall, 50-70 West 93rd Street and others. In the third quarter of 2014, we recognized a $10,263 non-cash charge, comprised of a $5,959 impairment loss and a $4,304 loan loss reserve, on our equity and debt investments in Suffolk Downs.
-4			In the first quarter of 2013, we began accounting for our investment in Lexington as a marketable equity security - available for sale.
6. Investments in Partially Owned Entities - continued
		Below is a summary of the debt of our partially owned entities as of December 31, 2014 and 2013, none of which is recourse to us.
			Percentage				Interest
			Ownership at				Rate at		100% Partially Owned Entities’
(Amounts in thousands)			December 31,				December 31,		Debt at December 31,
			2014		Maturity		2014		2014			2013
Toys:
	Notes, loans and mortgages payable		32.60%		2015-2021		7.23%		$	5,748,350		$	5,702,247
Alexander's:
	Mortgages payable		32.40%		2015-2021		2.59%		$	1,032,780		$	1,049,959
Partially owned office buildings(1):
	Mortgages payable		Various		2015-2023		5.59%		$	3,691,274		$	3,622,759
India Real Estate Ventures:
	TCG Urban Infrastructure Holdings mortgages
		payable	25.00%		2015-2026		13.25%		$	183,541		$	199,021
Other(2):
	Mortgages payable		Various		2015-2023		4.33%		$	1,480,485		$	1,709,509
-1		Includes 280 Park Avenue, 650 Madison Avenue, One Park Avenue, 666 Fifth Avenue (Office), 330 Madison Avenue and others.
-2		Includes Independence Plaza, Monmouth Mall, Fashion Center Mall, 50-70 West 93rd Street and others.
Based on our ownership interest in the partially owned entities above, our pro rata share of the debt of these partially owned entities, was $4,273,632,000 and $4,189,403,000 as of December 31, 2014 and 2013, respectively.

Mortgage_and_Mezzanine_Loans_R

Mortgage and Mezzanine Loans Receivable	12 Months Ended
	Dec. 31, 2014
Mezzanine Loans Receivable [Abstract]
Mortgage and Mezzanine Loans Receivable	7. Mortgage and Mezzanine Loans Receivable
	In October 2012, we acquired a 25% participation in a $475,000,000 first mortgage and mezzanine loan for the acquisition and redevelopment of a 10-story retail building at 701 Seventh Avenue in Times Square.  The loan had an interest rate of LIBOR plus 10.2%, with a LIBOR floor of 1.0%.  Of the $475,000,000, we funded $93,750,000, representing our 25% share of the $375,000,000 that was funded at acquisition. In March 2013, we transferred at par, the 25% participation in the mortgage loan. The transfer did not qualify for sale accounting given our continuing interest in the mezzanine loan. Accordingly, we continued to include the 25% participation in the mortgage loan in “other assets” and recorded a $59,375,000 liability in “other liabilities” on our consolidated balance sheet as of December 31, 2013. On January 14, 2014, the mortgage and mezzanine loans were repaid; accordingly, the $59,375,000 asset and liability were eliminated.
	On April 17, 2013, a $50,091,000 mezzanine loan that was scheduled to mature in August 2015, was repaid. In connection therewith, we received net proceeds of $55,358,000, including prepayment penalties, which resulted in income of $5,267,000, which is included in “interest and other investment income (loss), net” on our consolidated statement of income.
	In March 2014, a $30,000,000 mezzanine loan that was scheduled to mature in January 2015 was repaid. In May 2014, a $25,000,000 mezzanine loan that was scheduled to mature in November 2014 was repaid.
	As of December 31, 2014 and 2013, the carrying amounts of mortgage and mezzanine loans receivable were $16,748,000 and $170,972,000, respectively, net of an allowance of $5,811,000 and $5,845,000, respectively, and are included in “other assets” on our consolidated balance sheets. These loans have a weighted average interest rate of 9.1% and 11.0% at December 31, 2014 and 2013, respectively and have maturities ranging from April 2015 to May 2016.

Dispositions

Dispositions	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	8. Dispositions
	Discontinued Operations
	2014 Activity:
	New York
	On December 18, 2014, we completed the sale of 1740 Broadway, a 601,000 square foot office building in Manhattan for $605,000,000. The sale resulted in net proceeds of approximately $580,000,000, after closing costs, and resulted in a financial statement gain of approximately $441,000,000. The tax gain of approximately $484,000,000, was deferred in like-kind exchanges, primarily for the acquisition of the St. Regis Fifth Avenue retail (see Note 4 – Acquisitions).
	Retail Properties
	On February 24, 2014, we completed the sale of Broadway Mall in Hicksville, Long Island, New York, for $94,000,000. The sale resulted in net proceeds of $92,174,000 after closing costs.
	On March 2, 2014, we entered into an agreement to transfer upon completion, the redeveloped Springfield Town Center, a 1,350,000 square foot mall located in Springfield, Fairfax County, Virginia, to Pennsylvania Real Estate Investment Trust (NYSE: PEI) (“PREIT”) in exchange for $465,000,000 comprised of $340,000,000 of cash and $125,000,000 of PREIT operating partnership units. In connection therewith, we recorded a non-cash impairment loss of $20,000,000 in the first quarter of 2014, which is included in “income from discontinued operations” on our consolidated statements of income. The redevelopment was substantially completed in October 2014, at which time we reclassified the assets, liabilities and financial results to discontinued operations, and the transfer of the property to PREIT is expected to be completed no later than March 31, 2015.
	On July 8, 2014, we completed the sale of Beverly Connection, a 335,000 square foot power shopping center in Los Angeles, California, for $260,000,000, of which $239,000,000 was cash and $21,000,000 was 10-year mezzanine seller financing. The sale resulted in a net gain of $44,155,000, which was recognized in the third quarter of 2014.
	In addition to the above, during 2014, we sold six of the 22 strip shopping centers which did not fit UE's strategy (see Note 1 – Organization and Business), in separate transactions, for an aggregate of $66,410,000 in cash, which resulted in a net gain aggregating $22,500,000.
	2013 Activity:
	New York
	On December 17, 2013, we sold 866 United Nations Plaza, a 360,000 square foot office building in Manhattan for $200,000,000. The sale resulted in net proceeds of $146,439,000 after repaying the existing loan and closing costs, and a net gain of $127,512,000.
	Retail Properties
	On January 24, 2013, we sold the Green Acres Mall located in Valley Stream, New York, for $500,000,000. The sale resulted in net proceeds of $185,000,000 after repaying the existing loan and closing costs, and a net gain of $202,275,000.
	On April 15, 2013, we sold The Plant, a power strip shopping center in San Jose, California, for $203,000,000. The sale resulted in net proceeds of $98,000,000 after repaying the existing loan and closing costs, and a net gain of $32,169,000.
	On April 15, 2013, we sold a retail property in Philadelphia, which is a part of the Gallery at Market Street, for $60,000,000. The sale resulted in net proceeds of $58,000,000, and a net gain of $33,058,000.
	On September 23, 2013, we sold a retail property in Tampa, Florida for $45,000,000, of which our 75% share was $33,750,000. Our share of the net proceeds after repaying the existing loan and closing costs were $20,810,000, and our share of the net gain was $8,728,000.
	In addition to the above, during 2013, we sold 12 other properties, in separate transactions, for an aggregate of $82,300,000, in cash, which resulted in a net gain aggregating $7,851,000.
	8. Dispositions - continued
	2012 Activity:
	Washington, DC
	On July 26, 2012, we sold 409 Third Street S.W., a 409,000 square foot office building in Washington, DC, for $200,000,000, which resulted in a net gain of $126,621,000.
	On November 7, 2012, we sold three office buildings (“Reston Executive”) located in suburban Fairfax County, Virginia, containing 494,000 square feet for $126,250,000, which resulted in a net gain of $36,746,000.
	Merchandise Mart
	On January 6, 2012, we sold the 350 West Mart Center, a 1.2 million square foot office building in Chicago, Illinois, for $228,000,000, which resulted in a net gain of $54,911,000.
	On June 22, 2012, we sold the L.A. Mart, a 784,000 square foot showroom building in Los Angeles, California, for $53,000,000, of which $18,000,000 was cash and $35,000,000 was nine-month seller financing at 6.0%, which was paid on December 28, 2012.
	On July 26, 2012, we sold the Washington Design Center, a 393,000 square foot showroom building in Washington, DC and the Canadian Trade Shows, for an aggregate of $103,000,000. The sale of the Canadian Trade Shows resulted in an after-tax net gain of $19,657,000.
	On December 31, 2012, we sold the Boston Design Center, a 554,000 square foot showroom building in Boston, Massachusetts, for $72,400,000, which resulted in a net gain of $5,252,000.
	Retail Properties
	In 2012, we sold 12 other properties in separate transactions, for an aggregate of $157,000,000, which resulted in a net gain aggregating $22,266,000.
	In accordance with the provisions of ASC 360, Property, Plant, and Equipment, we have reclassified the revenues and expenses of all of the properties discussed above to “income from discontinued operations” and the related assets and liabilities to “assets related to discontinued operations” and “liabilities related to discontinued operations” for all of the periods presented in the accompanying financial statements. The net gains resulting from the sale of these properties are included in “income from discontinued operations” on our consolidated statements of income. The tables below set forth the assets and liabilities related to discontinued operations at December 31, 2014 and 2013, and their combined results of operations for the years ended December 31, 2014, 2013 and 2012.
			Assets Related to				Liabilities Related to
		(Amounts in thousands)	Discontinued Operations as of				Discontinued Operations as of
			December 31,				December 31,
			2014		2013		2014		2013
		Retail	$	477,620	$	735,888	$	211	$	14,709
		New York		-		138,162		-		-
		Total	$	477,620	$	874,050	$	211	$	14,709
		(Amounts in thousands)			For the Year Ended December 31,
					2014		2013		2012
		Total revenues			$	70,593	$	129,860	$	264,878
		Total expenses				36,424		79,458		190,450
						34,169		50,402		74,428
		Net gains on sales of real estate				507,192		414,502		245,799
		Impairment losses				-26,518		-18,170		-119,439
		Gain on sale of Canadian Trade Shows, net of $11,448 of income taxes				-		-		19,657
		Income from discontinued operations			$	514,843	$	446,734	$	220,445

Identified_Intangible_Assets_a

Identified Intangible Assets and Liabilities	12 Months Ended
	Dec. 31, 2014
Identified Intangible Assets and Liabilities [Abstract]
Identified Intangible Assets and Intangible Liabilities	9. Identified Intangible Assets and Liabilities
	The following summarizes our identified intangible assets (primarily acquired above-market leases) and liabilities (primarily acquired below-market leases) as of December 31, 2014 and 2013.
			Balance as of December 31,
		(Amounts in thousands)	2014		2013
		Identified intangible assets:
		Gross amount	$	502,080	$	583,862
		Accumulated amortization		-225,841		-276,426
		Net	$	276,239	$	307,436
		Identified intangible liabilities (included in deferred revenue):
		Gross amount	$	885,763	$	855,860
		Accumulated amortization		-396,895		-359,371
		Net	$	488,868	$	496,489
	Amortization of acquired below-market leases, net of acquired above-market leases resulted in an increase to rental income of $46,277,000, $50,128,000 and $51,271,000 for the years ended December 31, 2014, 2013 and 2012, respectively. Estimated annual amortization of acquired below-market leases, net of acquired above-market leases for each of the five succeeding years commencing January 1, 2015 is as follows:
		(Amounts in thousands)
		2015	$	57,202
		2016		45,333
		2017		42,457
		2018		41,311
		2019		30,950
	Amortization of all other identified intangible assets (a component of depreciation and amortization expense) was $29,870,000, $64,196,000 and $49,442,000 for the years ended December 31, 2014, 2013 and 2012, respectively. Estimated annual amortization of all other identified intangible assets including acquired in-place leases, customer relationships, and third party contracts for each of the five succeeding years commencing January 1, 2015 is as follows:
		(Amounts in thousands)
		2015	$	27,210
		2016		21,437
		2017		17,859
		2018		13,533
		2019		11,553
	We are a tenant under ground leases at certain properties. Amortization of these acquired below-market leases, net of above-market leases resulted in an increase to rent expense of $3,363,000, $4,290,000 and $1,261,000 for the years ended December 31, 2014, 2013 and 2012, respectively. Estimated annual amortization of these below-market leases, net of above-market leases for each of the five succeeding years commencing January 1, 2015 is as follows:
		(Amounts in thousands)
		2015	$	3,363
		2016		3,363
		2017		3,363
		2018		3,363
		2019		3,363

Debt

Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	10. Debt
	Secured Debt
	On January 31, 2014, we completed a $600,000,000 loan secured by our 220 Central Park South development site. The loan bears interest at LIBOR plus 2.75% (2.92% at December 31, 2014) and matures in January 2016, with three one-year extension options.
	On April 16, 2014, we completed a $350,000,000 refinancing of 909 Third Avenue, a 1.3 million square foot Manhattan office building. The seven-year interest only loan bears interest at 3.91% and matures in May 2021. We realized net proceeds of approximately $145,000,000 after defeasing the existing 5.64%, $193,000,000 mortgage, defeasance cost and other closing costs.
	On July 16, 2014, we completed a $130,000,000 financing of Las Catalinas, a 494,000 square foot mall located in the San Juan area of Puerto Rico. The 10-year fixed rate loan bears interest at 4.43% and matures in August 2024. The loan amortizes based on a 30-year schedule beginning in year six.
	On August 12, 2014, we completed a $185,000,000 financing of the Universal buildings, a 690,000 square foot, two-building office complex located in Washington, DC. The loan bears interest at LIBOR plus 1.90% (2.06% at December 31, 2014) and matures in August 2019 with two one-year extension options. The loan amortizes based on a 30-year schedule beginning in the fourth year.
	On August 26, 2014, we obtained a standby commitment for up to $500,000,000 of five-year mezzanine loan financing to fund a portion of the development expenditures at 220 Central Park South.
	On October 27, 2014, we completed a $140,000,000 financing of 655 Fifth Avenue, a 57,500 square foot retail and office property. The loan is interest only at LIBOR plus 1.40% (1.56% at December 31, 2014) and matures in October 2019 with two one-year extension options.
	On December 8, 2014, we completed a $575,000,000 refinancing of Two Penn Plaza, a 1.6 million square foot Manhattan office building. The loan is interest-only at LIBOR plus 1.65% (1.81% at December 31, 2014) and matures in 2019 with two one-year extension options. We realized net proceeds of approximately $143,000,000. Pursuant to an existing swap agreement, the $422,000,000 previous loan on the property was swapped to a fixed rate of 4.78% through March 2018. Therefore, $422,000,000 of the new loan bears interest at a fixed rate of 4.78% through March 2018 and the balance of $153,000,000 floats through March 2018. The entire $575,000,000 will float thereafter for the duration of the new loan.
	On January 6, 2015, we completed the modification of the $120,000,000, 6.04% mortgage loan secured by our Montehiedra Town Center, in the San Juan area of Puerto Rico. The loan has been extended from July 2016 to July 2021 and separated into two tranches, a senior $90,000,000 position with interest at 5.33% to be paid currently, and a junior $30,000,000 position with interest accruing at 3%. Montehiedra Town Center and the loan were included in the spin-off to UE on January 15, 2015. As part of the planned redevelopment of the property, UE is committed to fund $20,000,000 through a loan for leasing and building capital expenditures of which $8,000,000 has been funded. This loan is senior to the $30,000,000 position noted above and accrues interest at 10%.
	Senior Unsecured Notes
	On June 16, 2014, we completed a green bond public offering of $450,000,000 2.50% senior unsecured notes due June 30, 2019. The notes were sold at 99.619% of their face amount to yield 2.581%.
	On October 1, 2014, we redeemed all of the $445,000,000 principal amount of our outstanding 7.875% senior unsecured notes, which were scheduled to mature on October 1, 2039, at a redemption price of 100% of the principal amount plus accrued interest through the redemption date. In the fourth quarter of 2014, we wrote off $12,532,000 of unamortized deferred financing costs, which are included as a component of “interest and debt expense” on our consolidated statements of income.
	On January 1, 2015, we redeemed all of the $500,000,000 principal amount of our outstanding 4.25% senior unsecured notes, which were scheduled to mature on April 1, 2015, at a redemption price of 100% of the principal amount plus accrued interest through December 31, 2014.
	10. Debt – continued
	Unsecured Revolving Credit Facility
	On September 30, 2014, we extended one of our two $1.25 billion unsecured revolving credit facilities from November 2015 to November 2018 with two six-month extension options. The interest rate on the extended facility was lowered to LIBOR plus 105 basis points from LIBOR plus 125 basis points and the facility fee was reduced to 20 basis points from 25 basis points.
	The following is a summary of our debt:
						Weighted Average
						Interest Rate at			Balance at December 31,
		(Amounts in thousands)				31-Dec-14			2014		2013
		Mortgages Payable:
			Fixed rate				4.45%	$	7,710,931	$	7,563,133
			Variable rate				2.20%		1,840,769		768,860
							4.02%	$	9,551,700	$	8,331,993
		Unsecured Debt:
			Senior unsecured notes				3.89%	$	1,347,159	$	1,350,855
			Unsecured revolving credit facilities				-		-		295,870
							3.89%	$	1,347,159	$	1,646,725
	The net carrying amount of properties collateralizing the mortgages payable amounted to $10.4 billion at December 31, 2014. As of December 31, 2014, the principal repayments required for the next five years and thereafter are as follows:
							Senior Unsecured
							Debt and
		(Amounts in thousands)					Revolving Credit
		Year Ending December 31,			Mortgages Payable		Facilities
		2015		$	433,699	$	500,000
		2016			1,552,419		-
		2017			626,525		-
		2018			340,442		-
		2019			996,579		450,000
		Thereafter			5,601,148		400,000

Redeemable_Noncontrolling_Inte

Redeemable Noncontrolling Interests	12 Months Ended
	Dec. 31, 2014
Redeemable Noncontrolling Interests [Abstract]
Redeemable Noncontrolling Interests	11. Redeemable Noncontrolling Interests
	Redeemable noncontrolling interests on our consolidated balance sheets are primarily comprised of Class A Operating Partnership units held by third parties and are recorded at the greater of their carrying amount or redemption value at the end of each reporting period. Changes in the value from period to period are charged to “additional capital” in our consolidated statements of changes in equity. Class A units may be tendered for redemption to the Operating Partnership for cash; we, at our option, may assume that obligation and pay the holder either cash or Vornado common shares on a one-for-one basis. Because the number of Vornado common shares outstanding at all times equals the number of Class A units owned by Vornado, the redemption value of each Class A unit is equivalent to the market value of one Vornado common share, and the quarterly distribution to a Class A unitholder is equal to the quarterly dividend paid to a Vornado common shareholder.
	Below are the details of redeemable noncontrolling interests as of December 31, 2014 and 2013.
	(Amounts in thousands, except units and											Preferred or
	per unit amounts)			Balance as of				Units Outstanding at		Per Unit		Annual
				December 31,				December 31,		Liquidation		Distribution
	Unit Series			2014			2013	2014	2013	Preference		Rate
	Common:
		Class A		$	1,336,780	$	1,002,620	11,356,550	11,292,038		n/a	$	2.92
	Perpetual Preferred: (1)
		5.00% D-16 Cumulative Redeemable		$	1,000	$	1,000	1	1	$	1,000,000.00	$	50,000.00
	-1	Holders may tender units for redemption to the Operating Partnership for cash at their stated redemption amount; we, at our option, may assume that obligation and pay the holders either cash or Vornado preferred shares on a one-for-one basis. These units are redeemable at our option at any time.
	Below is a table summarizing the activity of redeemable noncontrolling interests.
		(Amounts in thousands)
		Balance at December 31, 2012	$	944,152
		Net income		24,817
		Other comprehensive income		5,296
		Distributions		-34,053
		Redemption of Class A units for common shares, at redemption value		-25,317
		Adjustments to carry redeemable Class A units at redemption value		108,252
		Redemption of Series D-15 redeemable units		-36,900
		Other, net		17,373
		Balance at December 31, 2013		1,003,620
		Net income		47,613
		Other comprehensive income		1,323
		Distributions		-33,469
		Redemption of Class A units for common shares, at redemption value		-27,273
		Adjustments to carry redeemable Class A units at redemption value		315,276
		Other, net		30,690
		Balance at December 31, 2014	$	1,337,780
	Redeemable noncontrolling interests exclude our Series G Convertible Preferred units and Series D-13 Cumulative Redeemable Preferred units, as they are accounted for as liabilities in accordance with ASC 480, Distinguishing Liabilities and Equity, because of their possible settlement by issuing a variable number of Vornado common shares. Accordingly, the fair value of these units is included as a component of “other liabilities” on our consolidated balance sheets and aggregated $55,097,000 as of December 31, 2014 and 2013.

Shareholders_Equity

Shareholders Equity	12 Months Ended
	Dec. 31, 2014
Shareholders' Equity [Abstract]
Shareholders' Equity	12. Shareholders' Equity
	Common Shares
	As of December 31, 2014, there were 187,887,498 common shares outstanding. During 2014, we paid an aggregate of $547,831,000 of common dividends comprised of quarterly common dividends of $0.73 per share.
	(Amounts in thousands, except share and		Balance as of						Shares Outstanding at			Per Share		Annual
	per share amounts)		December 31,						December 31,			Liquidation		Dividend
	Preferred Shares		2014			2013			2014		2013	Preference		Rate(1)
	Convertible Preferred:
		6.5% Series A: authorized 83,977 shares(2)	$	1,393		$	1,592		28,939		32,807	$	50	$	3.25
	Cumulative Redeemable:
		6.625% Series G: authorized 8,000,000 shares(3)		193,135			193,135		8,000,000		8,000,000	$	25	$	1.65625
		6.625% Series I: authorized 10,800,000 shares(3)		262,379			262,379		10,800,000		10,800,000	$	25	$	1.65625
		6.875% Series J: authorized 9,850,000 shares(3)		238,842			238,842		9,850,000		9,850,000	$	25	$	1.71875
		5.70% Series K: authorized 12,000,000 shares(3)		290,971			290,971		12,000,000		12,000,000	$	25	$	1.425
		5.40% Series L: authorized 12,000,000 shares(3)		290,306			290,306		12,000,000		12,000,000	$	25	$	1.35
			$	1,277,026		$	1,277,225		52,678,939		52,682,807
	-1	Dividends on preferred shares are cumulative and are payable quarterly in arrears.
	-2	Redeemable at our option under certain circumstances, at a redemption price of 1.4334 common shares per Series A Preferred Share plus accrued and unpaid dividends through the date of redemption, or convertible at any time at the option of the holder for 1.4334 common shares per Series A Preferred Share.
	-3	Redeemable at our option at a redemption price of $25.00 per share, plus accrued and unpaid dividends through the date of redemption.
	Accumulated Other Comprehensive Income (Loss)
	The following tables set forth the changes in accumulated comprehensive income (loss) by component.
				For the Year Ended December 31, 2014
							Securities			Pro rata share of		Interest
							available-			nonconsolidated		rate
	(Amounts in thousands)			Total			for-sale			subsidiaries' OCI		swap		Other
	Balance as of December 31, 2013			$	71,537		$	119,309		$	-11,501	$	-31,882	$	-4,389
	Net current period OCI				21,730			14,465			2,509		6,079		-1,323
	Balance as of December 31, 2014			$	93,267		$	133,774		$	-8,992	$	-25,803	$	-5,712

Variable_Interest_Entities_VIE

Variable Interest Entities ("VIEs")	12 Months Ended
	Dec. 31, 2014
Variable Interest Entities [Abstract]
Variable Interest Entities ("VIEs")	13. Variable Interest Entities (“VIEs”)
	Unconsolidated VIEs
	At December 31, 2014, we have unconsolidated VIEs comprised of our investments in the entities that own One Park Avenue, Independence Plaza, and the Warner Building, and at December 31, 2013, our unconsolidated VIEs comprised of our investments in the entities that own Independence Plaza and the Warner Building. We do not consolidate these entities because we are not the primary beneficiary and the nature of our involvement in the activities of these entities does not give us power over decisions that significantly affect these entities' economic performance. We account for our investment in these entities under the equity method (see Note 6 – Investments in Partially Owned Entities). As of December 31, 2014 and 2013, the net carrying amount of our investments in these entities was $286,783,000 and $152,929,000, respectively, and our maximum exposure to loss in these entities, is limited to our investments. We did not have any consolidated VIEs as of December 31, 2014 and 2013.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	14. Fair Value Measurements
	ASC 820, Fair Value Measurement and Disclosures defines fair value and establishes a framework for measuring fair value. The objective of fair value is to determine the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (the exit price). ASC 820 establishes a fair value hierarchy that prioritizes observable and unobservable inputs used to measure fair value into three levels: Level 1 – quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities; Level 2 – observable prices that are based on inputs not quoted in active markets, but corroborated by market data; and Level 3 – unobservable inputs that are used when little or no market data is available. The fair value hierarchy gives the highest priority to Level 1 inputs and the lowest priority to Level 3 inputs. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible, as well as consider counterparty credit risk in our assessment of fair value. Considerable judgment is necessary to interpret Level 2 and 3 inputs in determining the fair value of our financial and non-financial assets and liabilities. Accordingly, our fair value estimates, which are made at the end of each reporting period, may be different than the amounts that may ultimately be realized upon sale or disposition of these assets.
	Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis
	Financial assets and liabilities that are measured at fair value on our consolidated balance sheets consist of (i) marketable securities, (ii) Real Estate Fund investments, (iii) the assets in our deferred compensation plan (for which there is a corresponding liability on our consolidated balance sheet), (iv) interest rate swaps and (v) mandatorily redeemable instruments (Series G-1 through G-4 convertible preferred units and Series D-13 cumulative redeemable preferred units). The tables below aggregate the fair values of these financial assets and liabilities by their levels in the fair value hierarchy at December 31, 2014 and 2013, respectively.
				As of December 31, 2014
	(Amounts in thousands)			Total			Level 1			Level 2			Level 3
		Marketable securities		$	206,323		$	206,323		$	-		$	-
		Real Estate Fund investments (75% of which is attributable to
			noncontrolling interests)		513,973			-			-			513,973
		Deferred compensation plan assets (included in other assets)			117,284			53,969			-			63,315
			Total assets	$	837,580		$	260,292		$	-		$	577,288
		Mandatorily redeemable instruments (included in other liabilities)		$	55,097		$	55,097		$	-		$	-
		Interest rate swap (included in other liabilities)			25,797			-			25,797			-
			Total liabilities	$	80,894		$	55,097		$	25,797		$	-
				As of December 31, 2013
	(Amounts in thousands)			Total			Level 1			Level 2			Level 3
		Marketable securities		$	191,917		$	191,917		$	-		$	-
		Real Estate Fund investments (75% of which is attributable to
			noncontrolling interests)		667,710			-			-			667,710
		Deferred compensation plan assets (included in other assets)			116,515			47,733			-			68,782
			Total assets	$	976,142		$	239,650		$	-		$	736,492
		Mandatorily redeemable instruments (included in other liabilities)		$	55,097		$	55,097		$	-		$	-
		Interest rate swap (included in other liabilities)			31,882			-			31,882			-
			Total liabilities	$	86,979		$	55,097		$	31,882		$	-
	14. Fair Value Measurements - continued
	Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis - continued
	Real Estate Fund Investments
	At December 31, 2014, our Real Estate Fund had seven investments with an aggregate fair value of $513,973,000, or $176,899,000 in excess of cost. These investments are classified as Level 3. We use a discounted cash flow valuation technique to estimate the fair value of each of these investments, which is updated quarterly by personnel responsible for the management of each investment and reviewed by senior management at each reporting period. The discounted cash flow valuation technique requires us to estimate cash flows for each investment over the anticipated holding period, which currently ranges from 0.8 to 6.0 years. Cash flows are derived from property rental revenue (base rents plus reimbursements) less operating expenses, real estate taxes and capital and other costs, plus projected sales proceeds in the year of exit. Property rental revenue is based on leases currently in place and our estimates for future leasing activity, which are based on current market rents for similar space plus a projected growth factor. Similarly, estimated operating expenses and real estate taxes are based on amounts incurred in the current period plus a projected growth factor for future periods. Anticipated sales proceeds at the end of an investment's expected holding period are determined based on the net cash flow of the investment in the year of exit, divided by a terminal capitalization rate, less estimated selling costs.
	The fair value of each property is calculated by discounting the future cash flows (including the projected sales proceeds), using an appropriate discount rate and then reduced by the property's outstanding debt, if any, to determine the fair value of the equity in each investment. Significant unobservable quantitative inputs used in determining the fair value of each investment include capitalization rates and discount rates. These rates are based on the location, type and nature of each property, and current and anticipated market conditions, which are derived from original underwriting assumptions, industry publications and from the experience of our Acquisitions and Capital Markets departments. Significant unobservable quantitative inputs in the table below were utilized in determining the fair value of these Fund investments at December 31, 2014.
									Weighted Average
									(based on fair
		Unobservable Quantitative Input					Range		value of investments)
			Discount rates				12.0% to 17.5%		13.70%
			Terminal capitalization rates				4.7% to 6.5%		5.30%
	The above inputs are subject to change based on changes in economic and market conditions and/or changes in use or timing of exit. Changes in discount rates and terminal capitalization rates result in increases or decreases in the fair values of these investments. The discount rates encompass, among other things, uncertainties in the valuation models with respect to terminal capitalization rates and the amount and timing of cash flows. Therefore, a change in the fair value of these investments resulting from a change in the terminal capitalization rate, may be partially offset by a change in the discount rate. It is not possible for us to predict the effect of future economic or market conditions on our estimated fair values.
	The table below summarizes the changes in the fair value of Fund investments that are classified as Level 3, for the years ended December 31, 2014 and 2013.
					Real Estate Fund Investments
					For The Year Ended December 31,
		(Amounts in thousands)			2014			2013
		Beginning balance			$	667,710		$	600,786
		Purchases				3,392			43,816
		Dispositions / Distributions				-307,268			-70,848
		Net unrealized gains				73,802			85,771
		Net realized gains				76,337			8,184
		Other, net				-			1
		Ending balance			$	513,973		$	667,710
	14. Fair Value Measurements - continued
	Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis - continued
	Deferred Compensation Plan Assets
	Deferred compensation plan assets that are classified as Level 3 consist of investments in limited partnerships and investment funds, which are managed by third parties. We receive quarterly financial reports from a third-party administrator, which are compiled from the quarterly reports provided to them from each limited partnership and investment fund. The quarterly reports provide net asset values on a fair value basis which are audited by independent public accounting firms on an annual basis. The third-party administrator does not adjust these values in determining our share of the net assets and we do not adjust these values when reported in our consolidated financial statements.
	The table below summarizes the changes in the fair value of Deferred Compensation Plan Assets that are classified as Level 3, for the years ended December 31, 2014 and 2013.
					Deferred Compensation Plan Assets
					For The Year Ended December 31,
		(Amounts in thousands)			2014			2013
		Beginning balance			$	68,782		$	62,631
		Purchases				14,162			5,018
		Sales				-24,951			-7,306
		Realized and unrealized gains				3,415			7,189
		Other, net				1,907			1,250
		Ending balance			$	63,315		$	68,782
	Fair Value Measurements on a Nonrecurring Basis
	Assets measured at fair value on a nonrecurring basis on our consolidated balance sheets consist primarily of real estate assets and our investment in Toys that were written-down to estimated fair value during 2014 or 2013. See Note 2 – Basis of Presentation and Significant Accounting Policies for details of impairment losses recognized during 2014 and 2013. See Note 6 – Investments in Partially Owned Entities for details of impairment losses related to Toys recognized during 2014 and 2013. The fair value of our real estate assets was determined using widely accepted valuation techniques, including (i) discounted cash flow analysis, which considers, among other things, leasing assumptions, growth rates, discount rates and terminal capitalization rates, (ii) income capitalization approach, which considers prevailing market capitalization rates, and (iii) comparable sales activity. In determining the fair value of our investment in Toys, we considered, among other inputs, a December 31, 2013 third-party valuation of Toys and Toys' historical results, financial forecasts and business outlook. Our determination of the fair value of our investment in Toys included consideration of the following widely-used valuation methodologies: (i) market multiple methodology, that considered comparable publicly traded retail companies and a range of EBITDA multiples from 5.75x to 6.5x, (ii) comparable sales transactions methodology, that considered sales of retailers ranging in size from $150 million to $3 billion, (iii) a discounted cash flow methodology, that utilized five-year financial projections and assumed a terminal EBITDA multiple of 5.75x, a 10% discount rate and a 38% tax rate, and (iv) a Black-Scholes valuation analysis, that assumed one, two and three year time-to-expiration periods and 24% to 29% volatility factors. Generally, we consider multiple valuation techniques when measuring fair values but in certain circumstances, a single valuation technique may be appropriate. The tables below aggregate the fair values of these assets by their levels in the fair value hierarchy.
					As of December 31, 2014
		(Amounts in thousands)			Total			Level 1			Level 2			Level 3
		Real estate assets		$	4,848		$	-		$	-		$	4,848
				As of December 31, 2013
	(Amounts in thousands)			Total			Level 1			Level 2			Level 3
		Real estate assets		$	354,341		$	-		$	-		$	354,341
		Investment in Toys			83,224			-			-			83,224
			Total assets	$	437,565		$	-		$	-		$	437,565
14. Fair Value Measurements – continued
Financial Assets and Liabilities not Measured at Fair Value
Financial assets and liabilities that are not measured at fair value on our consolidated balance sheets include cash equivalents (primarily money market funds, which invest in obligations of the United States government), mortgage and mezzanine loans receivable (included in “other assets” in our consolidated balance sheets) and our secured and unsecured debt. Estimates of the fair value of these instruments are determined by the standard practice of modeling the contractual cash flows required under the instrument and discounting them back to their present value at the appropriate current risk adjusted interest rate, which is provided by a third-party specialist. For floating rate debt, we use forward rates derived from observable market yield curves to project the expected cash flows we would be required to make under the instrument. The fair value of cash equivalents is classified as Level 1 and the fair value of our mortgage and mezzanine loans receivable is classified as Level 3. The fair value of our secured and unsecured debt is classified as Level 2. The table below summarizes the carrying amounts and fair value of these financial instruments as of December 31, 2014 and 2013.
					As of December 31, 2014						As of December 31, 2013
					Carrying			Fair			Carrying			Fair
	(Amounts in thousands)				Amount			Value			Amount			Value
			Cash equivalents		$	749,418		$	749,000		$	295,000		$	295,000
			Mortgage and mezzanine loans receivable
				(included in other assets)		16,748			17,000			170,972			171,000
					$	766,166		$	766,000		$	465,972		$	466,000
		Debt:
			Mortgages payable		$	9,551,700		$	9,551,000		$	8,331,993		$	8,104,000
			Senior unsecured notes			1,347,159			1,385,000			1,350,855			1,402,000
			Revolving credit facility debt			-			-			295,870			296,000
					$	10,898,859		$	10,936,000		$	9,978,718		$	9,802,000

Stockbased_Compensation

Stock-based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based Compensation	15.       Stock-based Compensation
	Our Omnibus Share Plan (the “Plan”), which was approved in May 2010, provides the Compensation Committee of the Board (the “Committee”) the ability to grant incentive and non-qualified stock options, restricted stock, restricted Operating Partnership units and out-performance plan awards to certain of our employees and officers. Under the Plan, awards may be granted up to a maximum of 6,000,000 shares, if all awards granted are Full Value Awards, as defined, and up to 12,000,000 shares, if all of the awards granted are Not Full Value Awards, as defined, plus shares in respect of awards forfeited after May 2010 that were issued pursuant to our 2002 Omnibus Share Plan. Full Value Awards are awards of securities, such as restricted shares, that, if all vesting requirements are met, do not require the payment of an exercise price or strike price to acquire the securities. Not Full Value Awards are awards of securities, such as options, that do require the payment of an exercise price or strike price. This means, for example, if the Committee were to award only restricted shares, it could award up to 6,000,000 restricted shares. On the other hand, if the Committee were to award only stock options, it could award options to purchase up to 12,000,000 shares (at the applicable exercise price). The Committee may also issue any combination of awards under the Plan, with reductions in availability of future awards made in accordance with the above limitations. As of December 31, 2014, we have approximately 4,004,000 shares available for future grants under the Plan, if all awards granted are Full Value Awards, as defined.
	In the years ended December 31, 2014, 2013 and 2012, we recognized an aggregate of $36,641,000, $34,914,000 and $30,588,000, respectively, of stock-based compensation expense, which is included as a component of “general and administrative” expenses on our consolidated statements of income. The details of the various components of our stock-based compensation are discussed below.
	Out-Performance Plans (“the OPPs”)
	OPPs are multi-year, performance-based equity compensation plans under which participants, including our Chairman and Chief Executive Officer, have the opportunity to earn compensation payable in the form of equity awards if, and only if, we outperform a predetermined total shareholder return (“TSR”) and/or outperform the market with respect to a relative TSR in any year during the requisite performance periods as described below.   The aggregate notional amounts of the 2012, 2013, 2014 and 2015 OPPs are $40,000,000, $40,000,000, $50,000,000 and $40,000,000, respectively.
	Awards under the 2012 OPP have been earned.  Awards under the 2013 OPP may be earned if we (i) achieve a TSR greater than 14% over the two-year performance measurement period, or 21% over the three-year performance measurement period (the “Absolute Component”), and/or (ii) achieve a TSR above that of the SNL REIT Index (the “Index”) over the two-year or three-year performance measurement period (the “Relative Component”). Awards under the 2014 and 2015 OPP may be earned if we (i) achieve a TSR level greater than 7% per annum, or 21% over the three-year performance measurement periods (the “Absolute Component”), and/or (ii) achieve a TSR above that of the Index over the three-year performance measurement periods (the “Relative Component”). To the extent awards would be earned under the Absolute Component of each of the OPPs, but we underperform the Index, such awards would be reduced (and potentially fully negated) based on the degree to which we underperform the Index.  In certain circumstances, in the event we outperform the Index but awards would not otherwise be fully earned under the Absolute Component, awards may still be earned or increased under the Relative Component.  To the extent awards would otherwise be earned under the Relative Component but we fail to achieve at least a 6% per annum absolute TSR, such awards earned under the Relative Component would be reduced based on our absolute TSR, with no awards being earned in the event our TSR during the applicable measurement period is 0% or negative, irrespective of the degree to which we may outperform the Index.  Dividends on awards issued accrue during the performance period.
	If the designated performance objectives are achieved, OPP units are subject to time-based vesting requirements. Awards earned under the OPPs vest 33% in year three, 33% in year four and 34% in year five. Our executive officers (for the purposes of Section 16 of the Exchange Act) are required to hold earned 2013, 2014 and 2015 OPP awards for one year following vesting.
	The fair value of the 2012, 2013, 2014 and 2015 OPPs on the date of grant was $12,250,000, $6,814,000, $8,202,000, and $9,120,000, respectively. Such amounts are being amortized into expense over a five-year period from the date of grant, using a graded vesting attribution model. In the years ended December 31, 2014, 2013 and 2012, we recognized $6,185,000, $3,226,000 and $2,826,000, respectively, of compensation expense related to OPPs. As of December 31, 2014, there was $11,937,000 of total unrecognized compensation cost related to the OPPs, which will be recognized over a weighted-average period of 1.4 years.
	15.       Stock-based Compensation - continued
	Stock Options
	Stock options are granted at an exercise price equal to the average of the high and low market price of our common shares on the NYSE on the date of grant, generally vest over four years and expire 10 years from the date of grant. Compensation expense related to stock option awards is recognized on a straight-line basis over the vesting period. In the years ended December 31, 2014, 2013 and 2012, we recognized $4,550,000, $8,234,000 and $8,638,000, respectively, of compensation expense related to stock options that vested during each year. As of December 31, 2014, there was $1,855,000 of total unrecognized compensation cost related to unvested stock options, which is expected to be recognized over a weighted-average period of 1.5 years.
	Below is a summary of our stock option activity for the year ended December 31, 2014.
									Weighted-
						Weighted-			Average
						Average			Remaining	Aggregate
						Exercise			Contractual	Intrinsic
				Shares		Price			Term	Value
		Outstanding at January 1, 2014		3,248,699		$	67.51
		Granted		49,088			91.32
		Exercised		-434,204			67.27
		Cancelled or expired		-43,468			104.74
		Outstanding at December 31, 2014		2,820,115		$	67.38		4.6	$	145,317,000
		Options vested and expected to vest at
			31-Dec-14	2,818,587		$	67.37		4.6	$	145,271,000
		Options exercisable at December 31, 2014		2,606,260		$	65.62		4.4	$	138,912,000
	The fair value of each option grant is estimated on the date of grant using an option-pricing model with the following weighted-average assumptions for grants in the years ended December 31, 2014, 2013 and 2012.
			December 31,
			2014		2013		2012
		Expected volatility	36.00%		36.00%		36.00%
		Expected life	5.0 years		5.0 years		5.0 years
		Risk free interest rate	1.81%		0.91%		1.05%
		Expected dividend yield	4.10%		4.30%		4.30%
	The weighted average grant date fair value of options granted during the years ended December 31, 2014, 2013 and 2012 was $20.31, $17.18 and $17.50, respectively. Cash received from option exercises for the years ended December 31, 2014, 2013 and 2012 was $17,441,000, $5,915,000 and $9,546,000, respectively. The total intrinsic value of options exercised during the years ended December 31, 2014, 2013 and 2012 was $18,223,000, $3,386,000 and $40,887,000, respectively.
	15.       Stock-based Compensation - continued
	Restricted Stock
	Restricted stock awards are granted at the average of the high and low market price of our common shares on the NYSE on the date of grant and generally vest over four years. Compensation expense related to restricted stock awards is recognized on a straight-line basis over the vesting period. In the years ended December 31, 2014, 2013 and 2012, we recognized $1,303,000, $1,344,000 and $1,604,000, respectively, of compensation expense related to restricted stock awards that vested during each year. As of December 31, 2014, there was $1,468,000 of total unrecognized compensation cost related to unvested restricted stock, which is expected to be recognized over a weighted-average period of 1.7 years. Dividends paid on unvested restricted stock are charged directly to retained earnings and amounted to $88,000, $110,000 and $200,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	Below is a summary of our restricted stock activity under the Plan for the year ended December 31, 2014.
							Weighted-Average
							Grant-Date
		Unvested Shares			Shares		Fair Value
			Unvested at January 1, 2014		29,664		$	79.24
			Granted		11,475			91.31
			Vested		-15,733			74.61
			Cancelled or expired		-2,957			87.42
			Unvested at December 31, 2014		22,449			87.58
	Restricted stock awards granted in 2014, 2013 and 2012 had a fair value of $1,048,000, $857,000 and $929,000, respectively. The fair value of restricted stock that vested during the years ended December 31, 2014, 2013 and 2012 was $1,174,000, $1,194,000 and $1,864,000, respectively.
	Restricted Operating Partnership Units (“OP Units”)
	OP Units are granted at the average of the high and low market price of our common shares on the NYSE on the date of grant, vest ratably over four years and are subject to a taxable book-up event, as defined. Compensation expense related to OP Units is recognized ratably over the vesting period using a graded vesting attribution model. In the years ended December 31, 2014, 2013 and 2012, we recognized $24,603,000, $22,110,000 and $17,520,000, respectively, of compensation expense related to OP Units that vested during each year. As of December 31, 2014, there was $20,798,000 of total unrecognized compensation cost related to unvested OP Units, which is expected to be recognized over a weighted-average period of 1.7 years. Distributions paid on unvested OP Units are charged to “net income attributable to noncontrolling interests in the Operating Partnership” on our consolidated statements of income and amounted to $2,866,000, $2,598,000 and $3,203,000 in the years ended December 31, 2014, 2013 and 2012, respectively.
	Below is a summary of restricted OP unit activity under the Plan for the year ended December 31, 2014.
							Weighted-Average
							Grant-Date
		Unvested Units			Units		Fair Value
			Unvested at January 1, 2014		765,971		$	76.27
			Granted		226,638			86.79
			Vested		-327,555			69.48
			Cancelled or expired		-6,575			83.16
			Unvested at December 31, 2014		658,479			83.2
	OP Units granted in 2014, 2013 and 2012 had a fair value of $19,669,000, $31,947,000 and $16,464,000, respectively. The fair value of OP Units that vested during the years ended December 31, 2014, 2013 and 2012 was $22,758,000, $16,404,000 and $15,014,000, respectively.

Fee_and_Other_Income

Fee and Other Income	12 Months Ended
	Dec. 31, 2014
Fee and Other Income [Abstract]
Fee and Other Income	16. Fee and Other Income
	The following table sets forth the details of our fee and other income:
	(Amounts in thousands)		For the Year Ended December 31,
			2014		2013		2012
	BMS cleaning fees		$	85,658	$	66,505	$	67,584
	Signage revenue			37,929		32,866		20,892
	Management and leasing fees			21,382		24,637		21,849
	Lease termination fees(1)			17,042		92,497		2,361
	Other income			33,734		34,113		31,438
			$	195,745	$	250,618	$	144,124
	__________________________
	-1	The year ended December 31, 2013 includes (i) $59,599 of income pursuant to a settlement agreement with Stop & Shop, which terminates our right to receive $6,000 of additional annual rent under a 1992 agreement, for a period potentially through 2031, (ii) $19,500 from a tenant at 1290 Avenue of the Americas, of which our 70% share, net of a $1,529 write-off of the straight lining of rents, was $12,121, and (iii) $3,000 from the termination of our subsidiaries' agreements with Cuyahoga County to operate the Cleveland Medical Mart Convention Center.
	The above table excludes fee income from partially owned entities, which is included in “income from partially owned entities” (see Note 6 – Investments in Partially Owned Entities).

Interest_and_Other_Investment_

Interest and Other Investment Income (Loss), Net	12 Months Ended
	Dec. 31, 2014
Interest and Other Investment (Loss) Income, net [Abstract]
Interest and Other Investment Income (Loss), Net
	17. Interest and Other Investment Income (Loss), Net
	The following table sets forth the details of our interest and other investment income (loss):
	(Amounts in thousands)		For the Year Ended December 31,
			2014		2013		2012
	Dividends and interest on marketable securities		$	12,707	$	11,446	$	11,979
	Mark-to-market of investments in our deferred compensation plan (1)			11,557		10,636		6,809
	Interest on mezzanine loans receivable			3,920		19,495		13,861
	Losses from the disposition of investment in J.C. Penney			-		-72,974		-300,752
	Other, net			10,603		6,521		6,924
			$	38,787	$	-24,876	$	-261,179
	__________________________
	-1	This income is entirely offset by the expense resulting from the mark-to-market of the deferred compensation plan liability, which is included in "general and administrative" expense.

Interest_and_Debt_Expense

Interest and Debt Expense	12 Months Ended
	Dec. 31, 2014
Interest Expense Debt [Abstract]
Interest And Debt Expense [Text Block]	18. Interest and Debt Expense
	The following table sets forth the details of our interest and debt expense.
	(Amounts in thousands)	For the Year Ended December 31,
		2014		2013		2012
	Interest expense	$	483,578	$	498,050	$	478,688
	Amortization of deferred financing costs		46,923		25,557		22,907
	Capitalized interest and debt expense		-62,786		-42,303		-16,801
		$	467,715	$	481,304	$	484,794

Income_Per_Share

Income Per Share	12 Months Ended
	Dec. 31, 2014
Income Per Share [Abstract]
Income Per Share	19.       Income Per Share
	The following table provides a reconciliation of both net income and the number of common shares used in the computation of (i) basic income per common share - which includes the weighted average number of common shares outstanding without regard to dilutive potential common shares, and (ii) diluted income per common share - which includes the weighted average common shares and dilutive share equivalents. Dilutive share equivalents may include our Series A convertible preferred shares, employee stock options and restricted stock awards.
	(Amounts in thousands, except per share amounts)			Year Ended December 31,
				2014		2013		2012
	Numerator:
		Income from continuing operations, net of income attributable to noncontrolling interests		$	379,333	$	57,727	$	408,439
		Income from discontinued operations, net of income attributable to noncontrolling
			interests		485,519		418,244		208,821
		Net income attributable to Vornado			864,852		475,971		617,260
		Preferred share dividends			-81,464		-82,807		-76,937
		Preferred unit and share redemptions			-		-1,130		8,948
		Net income attributable to common shareholders			783,388		392,034		549,271
		Earnings allocated to unvested participating securities			-125		-110		-202
		Numerator for basic income per share			783,263		391,924		549,069
		Impact of assumed conversions:
			Convertible preferred share dividends		97		-		113
		Numerator for diluted income per share		$	783,360	$	391,924	$	549,182
	Denominator:
		Denominator for basic income per share – weighted average shares			187,572		186,941		185,810
		Effect of dilutive securities (1):
			Employee stock options and restricted share awards		1,075		768		670
			Convertible preferred shares		43		-		50
		Denominator for diluted income per share – weighted average shares and
			assumed conversions		188,690		187,709		186,530
	INCOME (LOSS) PER COMMON SHARE – BASIC:
		Income (loss) from continuing operations, net		$	1.59	$	-0.14	$	1.83
		Income from discontinued operations, net			2.59		2.24		1.12
		Net income per common share		$	4.18	$	2.1	$	2.95
	INCOME (LOSS) PER COMMON SHARE – DILUTED:
		Income (loss) from continuing operations, net		$	1.58	$	-0.14	$	1.82
		Income from discontinued operations, net			2.57		2.23		1.12
		Net income per common share		$	4.15	$	2.09	$	2.94
	-1		The effect of dilutive securities in the years ended December 31, 2014, 2013 and 2012 excludes an aggregate of 11,238, 11,752 and 14,400 weighted average common share equivalents, respectively, as their effect was anti-dilutive.

Leases

Leases	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Leases [Text Block]	20.       Leases
	As lessor:
	We lease space to tenants under operating leases. Most of the leases provide for the payment of fixed base rentals payable monthly in advance. Office building leases generally require the tenants to reimburse us for operating costs and real estate taxes above their base year costs. Shopping center leases provide for pass-through to tenants the tenant's share of real estate taxes, insurance and maintenance. Shopping center leases also provide for the payment by the lessee of additional rent based on a percentage of the tenants' sales. As of December 31, 2014, future base rental revenue under non-cancelable operating leases, excluding rents for leases with an original term of less than one year and rents resulting from the exercise of renewal options, are as follows:
		(Amounts in thousands)
		Year Ending December 31:
		2015	$	1,783,293
		2016		1,717,984
		2017		1,671,172
		2018		1,578,671
		2019		1,399,001
		Thereafter		8,055,804
	These amounts do not include percentage rentals based on tenants' sales. These percentage rents approximated $7,963,000, $8,578,000 and $8,090,000, for the years ended December 31, 2014, 2013 and 2012, respectively.
	None of our tenants accounted for more than 10% of total revenues in any of the years ended December 31, 2014, 2013 and 2012.
	As lessee:
	We are a tenant under operating leases for certain properties. These leases have terms that expire during the next thirty years. Future minimum lease payments under operating leases at December 31, 2014 are as follows:
		(Amounts in thousands)
		Year Ending December 31:
		2015	$	39,925
		2016		39,833
		2017		41,003
		2018		38,920
		2019		38,992
		Thereafter		1,252,109
	Rent expense was $50,556,000, $49,968,000 and $41,778,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	20.       Leases - continued
	We are also a lessee under a capital lease under which we will redevelop the retail and signage components of the Marriott Marquis Times Square Hotel. The lease has put/call options, which if exercised would lead to our ownership. Capitalized leases are recorded at the present value of future minimum lease payments or the fair market value of the property. Capitalized leases are depreciated on a straight-line basis over the estimated life of the asset or life of the related lease. Depreciation expense on capital leases is included in “depreciation and amortization” on our consolidated statements of income. As of December 31, 2014, future minimum lease payments under this capital lease are as follows:
		(Amounts in thousands)
		Year Ending December 31:
		2015	$	12,500
		2016		12,500
		2017		12,500
		2018		12,500
		2019		12,500
		Thereafter		334,792
		Total minimum obligations		397,292
		Interest portion		-157,292
		Present value of net minimum payments	$	240,000
	At December 31, 2014, the carrying amount of the property leased under the capital lease was $249,253,000, which is included as a component of “development costs and construction in progress” on our consolidated balance sheet and present value of net minimum payments of $240,000,000 is included in “other liabilities” on our consolidated balance sheet.

Multiemployer_Benefit_Plans

Multiemployer Benefit Plans	12 Months Ended
	Dec. 31, 2014
Multiemployer Plans [Abstract]
Multiemployer Benefit Plans	21.       Multiemployer Benefit Plans
	Our subsidiaries make contributions to certain multiemployer defined benefit plans (“Multiemployer Pension Plans”) and health plans (“Multiemployer Health Plans”) for our union represented employees, pursuant to the respective collective bargaining agreements.
	Multiemployer Pension Plans
	Multiemployer Pension Plans differ from single-employer pension plans in that (i) contributions to multiemployer plans may be used to provide benefits to employees of other participating employers and (ii) if other participating employers fail to make their contributions, each of our participating subsidiaries may be required to bear its then pro rata share of unfunded obligations. If a participating subsidiary withdraws from a plan in which it participates, it may be subject to a withdrawal liability. As of December 31, 2014, our subsidiaries' participation in these plans were not significant to our consolidated financial statements.
	In the years ended December 31, 2014, 2013 and 2012, our subsidiaries contributed $11,431,000, $10,223,000 and $10,683,000, respectively, towards Multiemployer Pension Plans, which is included as a component of “operating” expenses on our consolidated statements of income. Our subsidiaries' contributions did not represent more than 5% of total employer contributions in any of these plans for the years ended December 31, 2014, 2013 and 2012.
	Multiemployer Health Plans
	Multiemployer Health Plans in which our subsidiaries participate provide health benefits to eligible active and retired employees. In the years ended December 31, 2014, 2013 and 2012, our subsidiaries contributed $29,073,000, $26,262,000 and $26,759,000, respectively, towards these plans, which is included as a component of “operating” expenses on our consolidated statements of income.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	22.       Commitments and Contingencies
	Insurance
	We maintain general liability insurance with limits of $300,000,000 per occurrence and all risk property and rental value insurance with limits of $2.0 billion per occurrence, with sub-limits for certain perils such as floods. Our California properties have earthquake insurance with coverage of $180,000,000 per occurrence, subject to a deductible in the amount of 5% of the value of the affected property, up to a $180,000,000 annual aggregate. We maintain coverage for terrorism acts with limits of $4.0 billion per occurrence and in the aggregate, and $2.0 billion per occurrence and in the aggregate for terrorism involving nuclear, biological, chemical and radiological (“NBCR”) terrorism events, as defined by Terrorism Risk Insurance Program Reauthorization Act, which expires in December 2020.
	Penn Plaza Insurance Company, LLC (“PPIC”), our wholly owned consolidated subsidiary, acts as a re-insurer with respect to a portion of all risk property and rental value insurance and a portion of our earthquake insurance coverage, and as a direct insurer for coverage for NBCR acts. Coverage for acts of terrorism (excluding NBCR acts) is fully reinsured by third party insurance companies and the Federal government with no exposure to PPIC. For NBCR acts, PPIC is responsible for a deductible of $3,200,000 and 15% of the balance of a covered loss (16% effective January 1, 2016) and the Federal government is responsible for the remaining 85% of a covered loss (84% effective January 1, 2016). We are ultimately responsible for any loss incurred by PPIC.
	We continue to monitor the state of the insurance market and the scope and costs of coverage for acts of terrorism. However, we cannot anticipate what coverage will be available on commercially reasonable terms in the future.
	Our debt instruments, consisting of mortgage loans secured by our properties which are non-recourse to us, senior unsecured notes and revolving credit agreements contain customary covenants requiring us to maintain insurance. Although we believe that we have adequate insurance coverage for purposes of these agreements, we may not be able to obtain an equivalent amount of coverage at reasonable costs in the future. Further, if lenders insist on greater coverage than we are able to obtain it could adversely affect our ability to finance our properties and expand our portfolio.
	Other Commitments and Contingencies
	We are from time to time involved in legal actions arising in the ordinary course of business. In our opinion, after consultation with legal counsel, the outcome of such matters is not expected to have a material adverse effect on our financial position, results of operations or cash flows.
	Each of our properties has been subjected to varying degrees of environmental assessment at various times. The environmental assessments did not reveal any material environmental contamination. However, there can be no assurance that the identification of new areas of contamination, changes in the extent or known scope of contamination, the discovery of additional sites, or changes in cleanup requirements would not result in significant costs to us.
	Our mortgage loans are non-recourse to us. However, in certain cases we have provided guarantees or master leased tenant space. These guarantees and master leases terminate either upon the satisfaction of specified circumstances or repayment of the underlying loans. As of December 31, 2014, the aggregate dollar amount of these guarantees and master leases is approximately $359,000,000.
	At December 31, 2014, $39,552,000 of letters of credit were outstanding under one of our revolving credit facilities. Our revolving credit facilities contain financial covenants that require us to maintain minimum interest coverage and maximum debt to market capitalization ratios, and provide for higher interest rates in the event of a decline in our ratings below Baa3/BBB. Our revolving credit facilities also contain customary conditions precedent to borrowing, including representations and warranties, and also contain customary events of default that could give rise to accelerated repayment, including such items as failure to pay interest or principal.
	As of December 31, 2014, we expect to fund additional capital to certain of our partially owned entities aggregating approximately $104,000,000.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions Abstract
Related Party Transactions Disclosure [Text Block]	23.       Related Party Transactions
	Alexander's
	We own 32.4% of Alexander's. Steven Roth, the Chairman of our Board and Chief Executive Officer is also the Chairman of the Board and Chief Executive Officer of Alexander's. We provide various services to Alexander's in accordance with management, development and leasing agreements. These agreements are described in Note 6 - Investments in Partially Owned Entities.
	On January 15, 2015, we completed the spin-off of 79 strip shopping centers, three malls, a warehouse park and $225,000,000 of cash to UE and the transfer of all of the employees responsible for the management and leasing of those assets. In addition, we entered into agreements with UE to provide management and leasing services, on our behalf, for Alexander's Rego Park retail assets. Fees for these services are similar to the fees we are receiving from Alexander's described in Note 6 - Investments in Partially Owned Entities.
	Interstate Properties (“Interstate”)
	Interstate is a general partnership in which Mr. Roth is the managing general partner. David Mandelbaum and Russell B. Wight, Jr., Trustees of Vornado and Directors of Alexander's, are Interstate's two other partners. As of December 31, 2014, Interstate and its partners beneficially owned an aggregate of approximately 6.6% of the common shares of beneficial interest of Vornado and 26.3% of Alexander's common stock.
	We manage and lease the real estate assets of Interstate pursuant to a management agreement for which we receive an annual fee equal to 4% of annual base rent and percentage rent. The management agreement has a term of one year and is automatically renewable unless terminated by either of the parties on 60 days' notice at the end of the term. We believe, based upon comparable fees charged by other real estate companies, that the management agreement terms are fair to us. We earned $535,000, $606,000, and $794,000 of management fees under the agreement for the years ended December 31, 2014, 2013 and 2012.
	On January 15, 2015, we completed the spin-off of 79 strip shopping centers, three malls, a warehouse park and $225,000,000 of cash to UE and the transfer of all of the employees responsible for the management and leasing of those assets. In addition, we entered into agreements with UE to provide management and leasing services, on our behalf, for Interstate's properties. Fees for these services are similar to the fees we are receiving from Interstate described above.

Summary_of_Quarterly_Results_U

Summary of Quarterly Results (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Summary of Quarterly Results (Unaudited)	24.       Summary of Quarterly Results (Unaudited)
	The following summary represents the results of operations for each quarter in 2014 and 2013:
							Net Income (Loss)
							Attributable		Net Income (Loss) Per
							to Common		Common Share (2)
		(Amounts in thousands, except per share amounts)			Revenues		Shareholders (1)		Basic		Diluted
			2014
				31-Dec	$	679,101	$	513,238	$	2.73	$	2.72
				30-Sep		657,209		131,159		0.7		0.69
				30-Jun		652,972		76,642		0.41		0.41
				31-Mar		646,658		62,349		0.33		0.33
			2013
				31-Dec	$	649,403	$	-68,887	$	-0.37	$	-0.37
				30-Sep		655,883		83,005		0.44		0.44
				30-Jun		658,550		145,926		0.78		0.78
				31-Mar		705,433		231,990		1.24		1.24
	_______________________________
		-1		Fluctuations among quarters resulted primarily from non-cash impairment losses, mark-to-market of derivative instruments, net gains on sale of real estate and from seasonality of business operations.
		-2		The total for the year may differ from the sum of the quarters as a result of weighting.

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information	25. Segment Information
	Below is a summary of net income and a reconciliation of net income to EBITDA(1) by segment for the years ended December 31, 2014, 2013 and 2012.
	(Amounts in thousands)			For the Year Ended December 31, 2014
													Retail
					Total		New York			Washington, DC			Properties			Toys		Other
	Total revenues				$	2,635,940	$	1,520,845		$	537,151		$	326,947		$	-	$	250,997
	Total expenses					1,820,298		946,466			358,019			197,206			-		318,607
	Operating income (loss)					815,642		574,379			179,132			129,741			-		-67,610
	(Loss) income from partially owned
		entities, including Toys				-58,131		20,701			-3,677			1,730			-73,556		-3,329
	Income from Real Estate Fund					163,034		-			-			-			-		163,034
	Interest and other investment
		income, net				38,787		6,711			183			35			-		31,858
	Interest and debt expense					-467,715		-183,427			-75,395			-54,754			-		-154,139
	Net gain on disposition of wholly
		owned and partially owned assets				13,568		-			-			-			-		13,568
	Income (loss) before income taxes					505,185		418,364			100,243			76,752			-73,556		-16,618
	Income tax expense					-11,002		-4,305			-242			-1,721			-		-4,734
	Income (loss) from continuing
		operations				494,183		414,059			100,001			75,031			-73,556		-21,352
	Income from discontinued
		operations				514,843		463,163			-			50,873			-		807
	Net income (loss)					1,009,026		877,222			100,001			125,904			-73,556		-20,545
	Less net income attributable to
		noncontrolling interests				-144,174		-8,626			-			-119			-		-135,429
	Net income (loss) attributable to
		Vornado				864,852		868,596			100,001			125,785			-73,556		-155,974
	Interest and debt expense(2)					654,398		241,959			89,448			59,322			100,549		163,120
	Depreciation and amortization(2)					685,973		324,239			145,853			73,433			64,533		77,915
	Income tax expense(2)					24,248		4,395			288			1,721			12,106		5,738
	EBITDA(1)				$	2,229,471	$	1,439,189	(3)	$	335,590	(4)	$	260,261	(5)	$	103,632	$	90,799	(6)
	Balance Sheet Data:
	Real estate at cost				$	18,845,392	$	9,732,818		$	4,383,418		$	2,057,374			-	$	2,671,782
	Investments in partially owned entities					1,246,496		1,036,130			102,635			6,007			-		101,724
	Total assets					21,248,320		10,752,763			4,310,974			3,580,803			-		2,603,780
	See notes on pages 141 and 142.
	25. Segment Information – continued
	(Amounts in thousands)			For the Year Ended December 31, 2013
													Retail
					Total		New York			Washington, DC			Properties			Toys		Other
	Total revenues				$	2,669,269	$	1,470,907		$	541,161		$	372,435		$	-	$	284,766
	Total expenses					1,819,009		910,498			347,686			199,650			-		361,175
	Operating income (loss)					850,260		560,409			193,475			172,785			-		-76,409
	(Loss) income from partially owned
		entities, including Toys				-338,785		15,527			-6,968			2,097			-362,377		12,936
	Income from Real Estate Fund					102,898		-			-			-			-		102,898
	Interest and other investment
		(loss) income, net				-24,876		5,357			129			11			-		-30,373
	Interest and debt expense					-481,304		-181,966			-102,277			-55,219			-		-141,842
	Net gain on disposition of wholly
		owned and partially owned assets				3,407		-			-			1,377			-		2,030
	Income (loss) before income taxes					111,600		399,327			84,359			121,051			-362,377		-130,760
	Income tax benefit (expense)					6,406		-2,794			14,031			-2,311			-		-2,520
	Income (loss) from continuing
		operations				118,006		396,533			98,390			118,740			-362,377		-133,280
	Income (loss) from discontinued
		operations				446,734		160,314			-			287,067			-		-647
	Net income (loss)					564,740		556,847			98,390			405,807			-362,377		-133,927
	Less net income attributable to
		noncontrolling interests				-88,769		-10,786			-			-3,065			-		-74,918
	Net income (loss) attributable to
		Vornado				475,971		546,061			98,390			402,742			-362,377		-208,845
	Interest and debt expense(2)					758,781		236,645			116,131			63,803			181,586		160,616
	Depreciation and amortization(2)					732,757		293,974			142,409			72,161			135,178		89,035
Income tax expense (benefit)(2)					26,371		3,002			-15,707			2,311			33,532		3,233
EBITDA(1)				$	1,993,880	$	1,079,682	(3)	$	341,223	(4)	$	541,017	(5)	$	-12,081	$	44,039	(6)
Balance Sheet Data:
Real estate at cost				$	17,418,946	$	8,422,297		$	4,243,048		$	2,060,093		$	-	$	2,693,508
Investments in partially owned entities					1,249,667		904,278			100,543			6,640			83,224		154,982
Total assets					20,097,224		9,255,964			4,107,636			3,374,896			83,224		3,275,504
See notes on page 141 and 142.
25. Segment Information – continued
(Amounts in thousands)			For the Year Ended December 31, 2012
												Retail
				Total		New York			Washington, DC			Properties			Toys		Other
Total revenues				$	2,649,217	$	1,319,470		$	554,028		$	318,566		$	-	$	457,153
Total expenses					1,921,425		835,563			360,056			189,480			-		536,326
Operating income (loss)					727,792		483,907			193,972			129,086			-		-79,173
Income (loss) from partially owned
	entities, including Toys				423,126		207,773			-5,612			1,458			14,859		204,648
Income from Real Estate Fund					63,936		-			-			-			-		63,936
Interest and other investment
	(loss) income, net				-261,179		4,002			126			21			-		-265,328
Interest and debt expense					-484,794		-146,350			-115,574			-53,772			-		-169,098
Net gain on disposition of wholly
	owned and partially owned assets				13,347		-			-			8,491			-		4,856
Income (loss) before income taxes					482,228		549,332			72,912			85,284			14,859		-240,159
Income tax expense					-8,132		-3,491			-1,650			-			-		-2,991
Income (loss) from continuing
	operations				474,096		545,841			71,262			85,284			14,859		-243,150
Income (loss) from discontinued
	operations				220,445		30,293			167,766			-52,561			-		74,947
Net income (loss)					694,541		576,134			239,028			32,723			14,859		-168,203
Less net (income) loss attributable to
	noncontrolling interests				-77,281		-2,138			-			1,812			-		-76,955
Net income (loss) attributable to
	Vornado				617,260		573,996			239,028			34,535			14,859		-245,158
Interest and debt expense(2)					760,523		187,855			133,625			79,462			147,880		211,701
Depreciation and amortization(2)					735,293		252,257			157,816			86,529			135,179		103,512
Income tax expense (benefit)(2)					7,026		3,751			1,943			-			-16,629		17,961
EBITDA(1)				$	2,120,102	$	1,017,859	(3)	$	532,412	(4)	$	200,526	(5)	$	281,289	$	88,016	(6)
Balance Sheet Data:
Real estate at cost				$	17,365,533	$	8,687,141		$	4,171,879		$	2,108,328		$	-	$	2,398,185
Investments in partially owned entities					1,704,297		576,336			95,670			7,083			478,041		547,167
Total assets					22,065,049		9,215,438			4,196,694			3,583,999			478,041		4,590,877
See notes on page 141 and 142.
25. Segment Information – continued
	Notes to preceding tabular information:
-1	EBITDA represents "Earnings Before Interest, Taxes, Depreciation and Amortization." We consider EBITDA a supplemental measure for making decisions and assessing the unlevered performance of our segments as it relates to the total return on assets as opposed to the levered return on equity. As properties are bought and sold based on a multiple of EBITDA, we utilize this measure to make investment decisions as well as to compare the performance of our assets to that of our peers. EBITDA should not be considered a substitute for net income. EBITDA may not be comparable to similarly titled measures employed by other companies.
-2	Interest and debt expense, depreciation and amortization and income tax expense (benefit) in the reconciliation of net income (loss) to EBITDA includes our share of these items from partially owned entities.
-3	The elements of "New York" EBITDA are summarized below.
						For the Year Ended December 31,
	(Amounts in thousands)					2014			2013			2012
	Office(a)					$	1,085,262		$	759,941		$	568,518
	Retail						281,428			246,808			189,484
	Alexander's(b)						41,746			42,210			231,402
	Hotel Pennsylvania						30,753			30,723			28,455
		Total New York				$	1,439,189		$	1,079,682		$	1,017,859
	(a)		2014 and 2013 includes $440,537 and $127,512 net gains on sale of real estate, respectively.
	(b)		2012 includes $179,934 for our share of net gain on sale of Kings Plaza.
-4	The elements of "Washington, DC" EBITDA are summarized below.
						For the Year Ended December 31,
	(Amounts in thousands)					2014			2013			2012
	Office, excluding the Skyline Properties (a)					$	266,859		$	268,373		$	449,448
	Skyline properties						27,150			29,499			40,037
		Total Office					294,009			297,872			489,485
	Residential						41,581			43,351			42,927
		Total Washington, DC				$	335,590		$	341,223		$	532,412
	(a)		2012 includes $163,367 of net gains on sale of real estate.
-5	The elements of "Retail Properties" EBITDA are summarized below.
						For the Year Ended December 31,
	(Amounts in thousands)					2014			2013			2012
	Strip shopping centers(a)					$	219,122		$	285,612		$	172,708
	Regional malls(b)						41,139			255,405			27,818
		Total Retail properties				$	260,261		$	541,017		$	200,526
	(a)		2014 includes $66,023 of net gains on sale of real estate and $5,676 of impairment losses. 2013 includes $81,806 of net gains on sale of real estate, $59,599 of income pursuant to a settlement agreement with Stop & Shop and a $19,000 real estate impairment loss. 2012 includes $15,821 of net gains on sale of real estate and a $33,775 real estate impairment loss.
	(b)		2014 includes $20,842 of impairment losses. 2013 includes a $202,275 net gain on sale of the Green Acres Mall and a $13,443 real estate impairment loss. 2012 includes a $70,100 real estate impairment loss.
25. Segment Information – continued
	Notes to preceding tabular information:
-6	The elements of "other" EBITDA from continuing operations are summarized below.
	(Amounts in thousands)					For the Year Ended December 31,
						2014			2013				2012
	Our share of Real Estate Fund:
		Income before net realized/unrealized gains				$	8,056		$	7,752		$	6,385
		Net realized/unrealized gains on investments					37,535			23,489			13,840
		Carried interest					24,715			18,230			4,379
	Total						70,306			49,471			24,604
	The Mart and trade shows						79,636			74,270			62,470
	555 California Street						48,844			42,667			46,167
	India real estate ventures						6,434			5,841			3,654
	LNR(a)						-			20,443			75,202
	Lexington(b)						-			6,931			32,595
	Other investments						17,270			18,981			25,612
							222,490			218,604			270,304
	Corporate general and administrative expenses(c)						-94,929			-94,904			-89,082
	Investment income and other, net(c)						31,665			46,525			45,563
	Acquisition and transaction related costs, and impairment losses(d)						-31,348			-24,857			-17,386
	Net gain on sale of marketable securities, land parcels and residential
		condominiums					13,568			56,868			4,856
	Our share of debt satisfaction gains and net gains on sale of real estate
		of partially owned entities					13,000			-			-
	Suffolk Downs impairment loss and loan reserve						-10,263			-			-
	Our share of impairment losses of partially owned entities						-5,771			-			-4,936
	Losses from the disposition of investment in J.C. Penney						-			-127,888			-300,752
	Severance costs (primarily reduction in force at the Mart)						-			-5,492			-3,005
	Purchase price fair value adjustment and accelerated amortization of
		discount on investment in subordinated debt of Independence Plaza					-			-			105,366
	The Mart discontinued operations						-			-			93,588
	Net gain resulting from Lexington's stock issuance and asset acquisition						-			-			28,763
	Net income attributable to noncontrolling interests in the Operating Partnership						-47,563			-23,659			-35,327
	Preferred unit distributions of the Operating Partnership						-50			-1,158			-9,936
						$	90,799		$	44,039		$	88,016
	(a)		On April 19, 2013, LNR was sold.
	(b)		In the first quarter of 2013, we began accounting for our investment in Lexington as a marketable equity security - available for sale. This investment was previously accounted for under the equity method (see page 112 for details).
	(c)		The amounts in these captions (for this table only) exclude income/expense from the mark-to-market of our deferred compensation plan of $11,557, $10,636 and $6,809 for the years ended December 31, 2014, 2013 and 2012, respectively.
	(d)		The year ended December 31, 2014, includes $14,956 of transaction costs related to the spin-off of our strip shopping centers and malls.

SEC_Schedule_II_Valuation_and_

SEC Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation And Qualifying Accounts [Abstract]
Schedule Of Valuation And Qualifying Accounts Disclosure [Text Block]	VORNADO REALTY TRUST
	SCHEDULE II
	VALUATION AND QUALIFYING ACCOUNTS
	31-Dec-14
	(Amounts in Thousands)
		Column A			Column B		Column C		Column D		Column E
							Additions
					Balance at		Charged		Uncollectible		Balance
					Beginning		Against		Accounts		at End
			Description		of Year		Operations		Written-off		of Year
			Year Ended December 31, 2014:
				Allowance for doubtful accounts	$	32,069	$	3,614	$	-9,624	$	26,059
			Year Ended December 31, 2013:
				Allowance for doubtful accounts	$	40,839	$	11,417	$	-20,187	$	32,069
			Year Ended December 31, 2012:
				Allowance for doubtful accounts	$	46,531	$	9,697	$	-15,389	$	40,839

SEC_Schedule_III_Real_Estate_a

SEC Schedule III Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2014
Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate And Accumulated Depreciation Disclosure [Text Block]	VORNADO REALTY TRUST
	SCHEDULE III
	REAL ESTATE AND ACCUMULATED DEPRECIATION
	(Amounts in thousands)
	COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																	Gross amount at which									Life on which
									Initial cost to company (1)								carried at close of period									depreciation
															Costs							Accumulated				in latest
												Building			capitalized			Buildings				depreciation				income
												and			subsequent			and				and		Date of	Date	statement
	Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
		New York
			New York
				Manhattan
				1290 Avenue of the Americas		$	950,000		$	515,539		$	923,653	$	125,754	$	515,540	$	1,049,406	$	1,564,946	$	204,622	1963	2007	-4
				697-703 5th Avenue (St. Regis)			-			152,825			584,230		-		152,825		584,230		737,055		2,591		2014	-4
				350 Park Avenue			294,484			265,889			363,381		44,888		265,890		408,268		674,158		82,124	1960	2006	-4
				666 Fifth Avenue (Retail Condo)			390,000			189,005			471,072		-		189,005		471,072		660,077		25,020		2012	-4
				One Penn Plaza			-			-			412,169		195,595		-		607,764		607,764		249,036	1972	1998	-4
				100 West 33rd Street (Manhattan Mall)			223,242			242,776			247,970		31,257		242,777		279,226		522,003		52,608	1911	2007	-4
				1535 Broadway (Marriott Marquis)			-			-			249,285		123,615		-		372,900		372,900		528		2012	-4
				1540 Broadway			-			105,914			214,208		26,132		105,914		240,340		346,254		35,089		2006	-4
				655 Fifth Avenue			140,000			102,594			231,903		-		102,594		231,903		334,497		7,305		2013	-4
				Two Penn Plaza			575,000			53,615			164,903		88,592		52,689		254,421		307,110		124,324	1968	1997	-4
				Manhattan Mall			101,758			88,595			113,473		71,769		88,595		185,242		273,837		44,006	2009	2007	-4
				770 Broadway			353,000			52,898			95,686		96,360		52,898		192,046		244,944		81,108	1907	1998	-4
				90 Park Avenue			-			8,000			175,890		51,271		8,000		227,161		235,161		96,584	1964	1997	-4
				888 Seventh Avenue			318,554			-			117,269		116,624		-		233,893		233,893		97,295	1980	1998	-4
				909 Third Avenue			350,000			-			120,723		81,627		-		202,350		202,350		70,234	1969	1999	-4
				Eleven Penn Plaza			450,000			40,333			85,259		70,124		40,333		155,383		195,716		67,353	1923	1997	-4
				7 West 34th Street			-			-			-		179,579		34,614		144,965		179,579		58,186	1901	2000	-4
				640 Fifth Avenue			-			38,224			25,992		113,920		38,224		139,912		178,136		70,078	1950	1997	-4
				150 East 58th Street			-			39,303			80,216		35,385		39,303		115,601		154,904		46,971	1969	1998	-4
				595 Madison Avenue			-			62,731			62,888		22,407		62,731		85,295		148,026		30,921	1968	1999	-4
				828-850 Madison Avenue			80,000			107,937			28,261		10		107,937		28,271		136,208		6,831		2005	-4
				715 Lexington Avenue			-			-			26,903		63,000		63,000		26,903		89,903		6,553	1923	2001	-4
				4 Union Square South			119,847			24,079			55,220		2,614		24,079		57,834		81,913		14,903	1965/2004	1993	-4
				330 West 34th Street			-			-			8,599		67,997		-		76,596		76,596		1,957	1925	1998	-4
				510 Fifth Avenue			30,154			34,602			18,728		18,806		34,602		37,534		72,136		4,541		2010	-4
				478-482 Broadway			-			20,000			13,375		28,546		20,000		41,921		61,921		6,490	2009	2007	-4
				20 Broad Street			-			-			28,760		27,302		-		56,062		56,062		19,666	1956	1998	-4
				40 Fulton Street			-			15,732			26,388		13,932		15,732		40,320		56,052		16,298	1987	1998	-4
				689 Fifth Avenue			-			19,721			13,446		19,764		19,721		33,210		52,931		7,999	1925	1998	-4
				443 Broadway			-			11,187			41,186		-		11,187		41,186		52,373		1,651		2013	-4
				40 East 66th Street			-			13,616			34,635		142		13,616		34,777		48,393		7,848		2005	-4
				155 Spring Street			-			13,700			30,544		2,469		13,700		33,013		46,713		6,589		2007	-4
				435 Seventh Avenue			98,000			19,893			19,091		37		19,893		19,128		39,021		5,964	2002	1997	-4
				3040 M Street			-			7,830			27,490		3,256		7,830		30,746		38,576		6,978		2006	-4
				692 Broadway			-			6,053			22,908		3,536		6,053		26,444		32,497		6,124		2005	-4
				608 Fifth Avenue			-			-			-		30,826		-		30,826		30,826		1,334	1932	2012	-4
				677-679 Madison Avenue			-			13,070			9,640		388		13,070		10,028		23,098		2,145		2006	-4
				484-486 Broadway			-			10,000			6,688		5,040		10,000		11,728		21,728		1,746	2009	2007	-4
	VORNADO REALTY TRUST
	SCHEDULE III
	REAL ESTATE AND ACCUMULATED DEPRECIATION
	(Amounts in thousands)
	COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																	Gross amount at which									Life on which
									Initial cost to company (1)								carried at close of period									depreciation
															Costs							Accumulated				in latest
												Building			capitalized			Buildings				depreciation				income
												and			subsequent			and				and		Date of	Date	statement
	Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
				1135 Third Avenue		$	-		$	7,844		$	7,844	$	5,197	$	7,844	$	13,041	$	20,885	$	363		1997	-4
			431 Seventh Avenue			-			16,700			2,751		-		16,700		2,751		19,451		533		2007	-4
			304 - 306 Canal Street			-			3,511			12,905		-		3,511		12,905		16,416		-		2014	-4
			334 Canal Street			-			1,693			6,507		7,107		1,693		13,614		15,307		5		2011	-4
			267 West 34th Street			-			5,099			10,037		-		5,099		10,037		15,136		295		2013	-4
			1540 Broadway Garage			-			4,086			8,914		-		4,086		8,914		13,000		1,912	1990	2006	-4
			966 Third Avenue			-			8,869			3,631		-		8,869		3,631		12,500		121		2013	-4
			148 Spring Street			-			3,200			8,112		392		3,200		8,504		11,704		1,396		2008	-4
			150 Spring Street			-			3,200			5,822		266		3,200		6,088		9,288		1,016		2008	-4
			488 Eighth Avenue			-			10,650			1,767		-4,674		6,859		884		7,743		156		2007	-4
			484 Eighth Avenue			-			3,856			762		383		3,856		1,145		5,001		345		1997	-4
			825 Seventh Avenue			-			1,483			697		33		1,483		730		2,213		322		1997	-4
			Other (Including Signage)			-			-			5,548		88,732		-		94,280		94,280		13,659
				Total New York		4,474,039			2,345,852			5,227,329		1,860,000		2,438,752		6,994,429		9,433,181		1,591,723
		New Jersey
			Paramus			-			-			-		27,521		1,033		26,488		27,521		16,868	1967	1987	-4
		Other Properties
			Hotel Pennsylvania			-			29,903			121,712		81,199		29,903		202,911		232,814		85,990	1919	1997	-4
	Total New York					4,474,039			2,375,755			5,349,041		1,968,720		2,469,688		7,223,828		9,693,516		1,694,581
	Washington, DC
		Washington, DC
			2011-2451 Crystal Drive			223,652			100,935			409,920		138,116		100,229		548,742		648,971		196,953	1984-1989	2002	-4
			2001 Jefferson Davis Highway,
			2100/2200 Crystal Drive, 223 23rd
			Street, 2221 South Clark Street, Crystal
			City Shops at 2100, 220 20th Street			71,256			57,213			131,206		180,729		49,683		319,465		369,148		71,562	1964-1969	2002	-4
			1550-1750 Crystal Drive/
			241-251 18th Street			40,865			64,817			218,330		78,232		64,652		296,727		361,379		99,573	1974-1980	2002	-4
			Riverhouse Apartments			259,546			118,421			125,078		69,507		138,819		174,187		313,006		35,074		2007	-4
			Skyline Place (6 buildings)			456,421			41,986			221,869		29,537		41,862		251,530		293,392		84,826	1973-1984	2002	-4
			1215, 1225 S. Clark Street/ 200, 201
			12th Street S.			58,829			47,594			177,373		44,496		47,465		221,998		269,463		72,395	1983-1987	2002	-4
			1229-1231 25th Street (West End 25)			101,671			67,049			5,039		106,659		68,198		110,549		178,747		14,439		2007	-4
			Met Park / Warehouses			-			106,946			1,326		67,761		82,898		93,135		176,033		1,321		2007	-4
			2101 L Street			148,922			32,815			51,642		83,554		39,768		128,243		168,011		30,848	1975	2003	-4
			2200 / 2300 Clarendon Blvd			35,132			-			105,475		45,831		-		151,306		151,306		50,525	1988-1989	2002	-4
			1800, 1851 and 1901 South Bell Street			-			37,551			118,806		-7,053		37,551		111,753		149,304		31,493	1968	2002	-4
			Bowen Building - 875 15th Street, NW			115,022			30,077			98,962		1,962		30,176		100,825		131,001		24,031	2004	2005	-4
			1875 Connecticut Ave, NW			92,500			36,303			82,004		7,269		35,886		89,690		125,576		20,162	1963	2007	-4
			One Skyline Tower			138,938			12,266			75,343		36,416		12,231		111,794		124,025		38,697	1988	2002	-4
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
(Amounts in thousands)
COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																Gross amount at which									Life on which
								Initial cost to company (1)								carried at close of period									depreciation
														Costs							Accumulated				in latest
											Building			capitalized			Buildings				depreciation				income
											and			subsequent			and				and		Date of	Date	statement
Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
			1399 New York Avenue, NW		$	-		$	33,481		$	67,363	$	5,736	$	34,178	$	72,402	$	106,580	$	7,425		2011	-4
			Commerce Executive			-			13,401			58,705		20,283		13,140		79,249		92,389		25,710	1985-1989	2002	-4
			Seven Skyline Place			103,971			10,292			58,351		23,086		10,262		81,467		91,729		18,906	2001	2002	-4
			1825 Connecticut Ave, NW			92,500			33,090			61,316		-4,958		32,726		56,722		89,448		13,335	1956	2007	-4
			1235 S. Clark Street			-			15,826			53,894		18,636		15,826		72,530		88,356		22,186	1981	2002	-4
			H Street - North 10-1D Land Parcel			-			104,473			55		-33,488		61,970		9,070		71,040		-		2007	-4
			1750 Pennsylvania Avenue			-			20,020			30,032		15,094		21,170		43,976		65,146		11,250	1964	2002	-4
			Crystal City Hotel			-			8,000			47,191		9,316		8,000		56,507		64,507		14,565	1968	2004	-4
			1150 17th Street			28,728			23,359			24,876		15,224		24,723		38,736		63,459		14,992	1970	2002	-4
			1730 M Street			14,853			10,095			17,541		9,895		10,687		26,844		37,531		10,198	1963	2002	-4
			Democracy Plaza One			-			-			33,628		3,321		-		36,949		36,949		16,407	1987	2002	-4
			1726 M Street			-			9,450			22,062		3,433		9,455		25,490		34,945		6,036	1964	2006	-4
			Crystal Drive Retail			-			-			20,465		6,771		-		27,236		27,236		10,325	2004	2004	-4
			1109 South Capitol Street			-			11,541			178		-253		11,597		-131		11,466		-		2007	-4
			South Capitol			-			4,009			6,273		-1,741		-		8,541		8,541		-		2005	-4
			H Street			-			1,763			641		41		1,763		682		2,445		161		2005	-4
			Other			-			-			51,767		-37,673		-		14,094		14,094		156
	Total Washington, DC					1,982,806			1,052,773			2,376,711		935,739		1,004,915		3,360,308		4,365,223		943,551
	Retail Properties
		California
			Walnut Creek (1149 S. Main St)			-			2,699			19,930		-		2,699		19,930		22,629		4,599		2006	-4
			Signal Hill			-			9,652			2,940		2		9,653		2,941		12,594		607		2006	-4
			Walnut Creek (1556 Mount Diablo Blvd)			-			5,909			-		1,536		5,908		1,537		7,445		129		2007	-4
			Vallejo			-			-			2,945		221		-		3,166		3,166		654		2006	-4
				Total California		-			18,260			25,815		1,759		18,260		27,574		45,834		5,989
		Connecticut
			Waterbury			13,643			667			4,504		4,666		667		9,170		9,837		6,077	1969	1969	-4
			Newington			10,969			2,421			1,200		1,193		2,421		2,393		4,814		801	1965	1965	-4
				Total Connecticut		24,612			3,088			5,704		5,859		3,088		11,563		14,651		6,878
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
(Amounts in thousands)
COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																Gross amount at which									Life on which
								Initial cost to company (1)								carried at close of period									depreciation
														Costs							Accumulated				in latest
											Building			capitalized			Buildings				depreciation				income
											and			subsequent			and				and		Date of	Date	statement
Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
		Maryland
			Rockville		$	-		$	3,470		$	20,599	$	810	$	3,470	$	21,409	$	24,879	$	5,106		2005	-4
			Baltimore (Towson)			15,248			581			3,227		10,498		581		13,725		14,306		5,741	1968	1968	-4
			Annapolis			-			-			9,652		-		-		9,652		9,652		2,956		2005	-4
			Wheaton			-			-			5,367		-		-		5,367		5,367		1,107		2006	-4
			Glen Burnie			-			462			2,571		1,807		462		4,378		4,840		3,088	1958	1958	-4
				Total Maryland		15,248			4,513			41,416		13,115		4,513		54,531		59,044		17,998
		Massachusetts
			Springfield			5,591			2,797			2,471		591		2,797		3,062		5,859		1,111	1993	1966	-4
			Chicopee			8,106			895			-		-		895		-		895		-	1969	1969	-4
			Cambridge			-			-			-		260		-		260		260		176
				Total Massachusetts		13,697			3,692			2,471		851		3,692		3,322		7,014		1,287
		New Hampshire
			Salem			-			6,083			-		-		6,083		-		6,083		-		2006	-4
		New Jersey
			Paramus (Bergen Town Center)			300,000			19,884			81,723		376,240		37,635		440,212		477,847		82,904	1957/2009	2003	-4
			North Bergen (Tonnelle Ave)			75,000			24,493			-		63,717		31,806		56,404		88,210		9,486	2009	2006	-4
			Union (Springfield Avenue)			27,822			19,700			45,090		-		19,700		45,090		64,790		8,548		2007	-4
			Wayne Towne Center			-			-			26,137		22,842		-		48,979		48,979		5,575		2010	-4
			East Rutherford			13,269			-			36,727		60		-		36,787		36,787		5,284	2007	2007	-4
			Garfield			-			45			8,068		25,707		45		33,775		33,820		6,962	2009	1998	-4
			East Hanover I and II			41,786			2,232			18,241		12,033		2,671		29,835		32,506		15,472	1962	1962/1998	-4
			Lodi (Washington Street)			-			7,606			13,125		2,596		7,606		15,721		23,327		3,494		2004	-4
			Bricktown			31,192			1,391			11,179		6,317		1,391		17,496		18,887		12,300	1968	1968	-4
			East Brunswick II (339-341 Route 18 S.)			11,503			2,098			10,949		4,056		2,098		15,005		17,103		9,184	1972	1972	-4
			Hazlet			-			7,400			9,413		-		7,400		9,413		16,813		1,784		2007	-4
			Totowa			24,183			120			11,994		4,653		92		16,675		16,767		12,839	1957/1999	1957	-4
			Carlstadt			-			-			16,457		1		-		16,458		16,458		2,959		2007	-4
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
(Amounts in thousands)
COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																Gross amount at which									Life on which
								Initial cost to company (1)								carried at close of period									depreciation
														Costs							Accumulated				in latest
											Building			capitalized			Buildings				depreciation				income
											and			subsequent			and				and		Date of	Date	statement
Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
			North Plainfield		$	-		$	6,577		$	13,983	$	-5,507	$	6,577	$	8,476	$	15,053	$	2,999	1955	1989	-4
			Marlton			16,853			1,611			3,464		9,960		1,454		13,581		15,035		8,538	1973	1973	-4
			Hackensack			39,592			692			10,219		3,284		692		13,503		14,195		9,657	1963	1963	-4
			Union (Route 22 and Morris Ave)			31,567			3,025			7,470		3,394		3,025		10,864		13,889		5,275	1962	1962	-4
			Manalapan			20,545			725			7,189		5,534		1,046		12,402		13,448		8,177	1971	1971	-4
			Cherry Hill			13,536			5,864			2,694		4,177		4,864		7,871		12,735		3,985	1964	1964	-4
			South Plainfield			5,003			-			10,044		1,582		-		11,626		11,626		2,221		2007	-4
			Watchung			14,713			4,178			5,463		1,711		4,441		6,911		11,352		4,240	1994	1959	-4
			Englewood			11,571			2,300			17,245		-8,390		1,495		9,660		11,155		566		2007	-4
			Dover			12,841			559			6,363		3,598		559		9,961		10,520		6,628	1964	1964	-4
			Eatontown			-			4,653			4,999		326		4,653		5,325		9,978		1,371		2005	-4
			Lodi (Route 17 N.)			11,075			238			9,446		-		238		9,446		9,684		3,599	1999	1975	-4
			Morris Plains			20,866			1,104			6,411		1,101		1,104		7,512		8,616		6,934	1961	1985	-4
			Jersey City			19,796			652			7,495		468		652		7,963		8,615		2,799	1965	1965	-4
			East Brunswick I (325-333 Route 18 S.)			24,290			319			6,220		1,959		319		8,179		8,498		6,725	1957	1957	-4
			Middletown			16,960			283			5,248		2,450		283		7,698		7,981		5,669	1963	1963	-4
			Woodbridge			20,171			1,509			2,675		1,969		1,539		4,614		6,153		2,636	1959	1959	-4
			Lawnside			10,433			851			3,164		1,351		851		4,515		5,366		4,313	1969	1969	-4
			Kearny			-			309			3,376		1,489		309		4,865		5,174		3,667	1938	1959	-4
			Turnersville			-			900			1,342		1,094		900		2,436		3,336		2,194	1974	1974	-4
			North Bergen (Kennedy Blvd)			4,976			2,308			636		13		2,308		649		2,957		447	1993	1959	-4
			Montclair			2,568			66			419		381		66		800		866		694	1972	1972	-4
				Total New Jersey		822,111			123,692			424,668		550,166		147,819		950,707		1,098,526		270,125
		New York
			Bronx (Bruckner Blvd)			-			66,100			259,503		-63,515		61,618		200,470		262,088		6,160		2007	-4
			Huntington			16,265			21,200			33,667		1,690		21,200		35,357		56,557		6,173		2007	-4
			Mt. Kisco			27,733			22,700			26,700		784		23,297		26,887		50,184		4,653		2007	-4
			Bronx (1750-1780 Gun Hill Road)			-			6,427			11,885		19,159		6,428		31,043		37,471		5,028	2009	2005	-4
			Staten Island			17,000			11,446			21,262		2,725		11,446		23,987		35,433		6,075		2004	-4
			Inwood			-			12,419			19,097		795		12,419		19,892		32,311		4,974		2004	-4
			Buffalo (Amherst)			-			5,743			4,056		13,008		5,107		17,700		22,807		6,306	1968	1968	-4
			West Babylon			-			6,720			13,786		201		6,720		13,987		20,707		2,700		2007	-4
			Freeport (437 E. Sunrise Highway)			20,866			1,231			4,747		3,091		1,231		7,838		9,069		5,343	1981	1981	-4
			Dewitt			-			-			7,116		-		-		7,116		7,116		1,453		2006	-4
			Oceanside			-			2,710			2,306		-		2,710		2,306		5,016		437		2007	-4
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
(Amounts in thousands)
COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																Gross amount at which									Life on which
								Initial cost to company (1)								carried at close of period									depreciation
														Costs							Accumulated				in latest
											Building			capitalized			Buildings				depreciation				income
											and			subsequent			and				and		Date of	Date	statement
Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
			Rochester (Henrietta)		$	-		$	-		$	2,647	$	1,149	$	-	$	3,796	$	3,796	$	3,324	1971	1971	-4
			Rochester			4,280			2,172			-		-		2,172		-		2,172		-	1966	1966	-4
			Freeport (240 West Sunrise Highway)			-			-			-		260		-		260		260		151		2005	-4
			Commack			-			-			43		184		-		227		227		123		2006	-4
			New Hyde Park			-			-			4		-		-		4		4		126	1970	1976	-4
				Total New York		86,144			158,868			406,819		-20,469		154,348		390,870		545,218		53,026
		Pennsylvania
			Wilkes-Barre			-			6,053			26,646		794		6,053		27,440		33,493		4,931		2007	-4
			Allentown			29,266			187			15,580		1,933		187		17,513		17,700		13,818	1957	1957	-4
			Bensalem			14,526			2,727			6,698		1,895		2,727		8,593		11,320		3,689	1972/1999	1972	-4
			Bethlehem			5,457			827			5,200		1,334		839		6,522		7,361		5,593	1966	1966	-4
			Wyomissing			-			-			2,646		2,381		-		5,027		5,027		3,471		2005	-4
			Broomall			10,433			850			2,171		1,680		850		3,851		4,701		2,792	1966	1966	-4
			York			5,083			409			2,568		1,395		409		3,963		4,372		3,566	1970	1970	-4
			Lancaster			5,270			3,140			63		689		3,140		752		3,892		518	1966	1966	-4
			Glenolden			6,688			850			1,820		613		850		2,433		3,283		2,101	1975	1975	-4
			Springfield			-			-			-		80		-		80		80		80		2005	-4
				Total Pennsylvania		76,723			15,043			63,392		12,794		15,055		76,174		91,229		40,559
		South Carolina
			Charleston			-			-			3,634		-		-		3,634		3,634		750		2006	-4
		Virginia
			Norfolk			-			-			3,927		15		-		3,942		3,942		2,885		2005	-4
		Puerto Rico
			Las Catalinas			130,000			15,280			64,370		10,121		15,280		74,491		89,771		30,478	1996	2002	-4
			Montehiedra			120,000			9,182			66,751		8,328		9,267		74,994		84,261		31,673	1996	1997	-4
				Total Puerto Rico		250,000			24,462			131,121		18,449		24,547		149,485		174,032		62,151
		Other				-			-			-		4,232		-		4,232		4,232		591			-4
	Total Retail Properties					1,288,535			357,701			1,108,967		586,771		377,405		1,676,034		2,053,439		462,239
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
(Amounts in thousands)
COLUMN A						COLUMN B			COLUMN C					COLUMN D		COLUMN E						COLUMN F	COLUMN G	COLUMN H	COLUMN I
																Gross amount at which									Life on which
								Initial cost to company (1)								carried at close of period									depreciation
														Costs							Accumulated				in latest
											Building			capitalized			Buildings				depreciation				income
											and			subsequent			and				and		Date of	Date	statement
Description					Encumbrances			Land			improvements			to acquisition		Land	improvements		Total (2)		amortization		construction (3)	acquired	is computed
	Other
		The Mart
		Illinois
			The Mart, Chicago		$	550,000		$	64,528		$	319,146	$	274,921	$	64,535	$	594,060	$	658,595	$	211,332	1930	1998	-4
			527 W. Kinzie, Chicago			-			5,166			-		-		5,166		-		5,166		-
				Total Illinois		550,000			69,694			319,146		274,921		69,701		594,060		663,761		211,332
		New York
			MMPI Piers			-			-			-		12,794		-		12,794		12,794		1,020		2008	-4
	Total The Mart					550,000			69,694			319,146		287,715		69,701		606,854		676,555		212,352
	Warehouse/Industrial
		New Jersey
			East Hanover			-			576			7,752		19,730		691		27,367		28,058		14,259	1972	1972	-4
			555 California Street			597,868			221,903			893,324		75,383		221,903		968,707		1,190,610		197,170	1922/1969/1970	2007	-4
			220 Central Park South			600,000			115,720			16,420		460,941		-		593,081		593,081		-		2005	-4
			Borgata Land, Atlantic City, NJ			58,452			83,089			7		-6		83,090		-		83,090		-		2010	-4
			40 East 66th Residential			-			29,199			85,798		-86,696		10,990		17,311		28,301		3,686		2005	-4
			677-679 Madison			-			1,462			1,058		284		1,626		1,178		2,804		322		2006	-4
			Other			-			28,052			-		-27,931		-		121		121		-		2005	-4
	Total Other					1,256,320			479,425			996,607		421,975		317,609		1,580,398		1,898,007		201,178
	Leasehold Improvements
		Equipment and Other				-			-			-		130,594		-		130,594		130,594		100,975
		Total December 31, 2014			$	9,551,700		$	4,335,924		$	10,158,224	$	4,351,244	$	4,240,009	$	14,605,383	$	18,845,392	$	3,629,135
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
Notes:
-1		Initial cost is cost as of January 30, 1982 (the date on which Vornado commenced real estate operations) unless acquired subsequent to that date see Column H.
-2		The net basis of the Company’s assets and liabilities for tax purposes is approximately $3.6 billion lower than the amount reported for financial statement purposes.
-3		Date of original construction –– many properties have had substantial renovation or additional construction –– see Column D.
-4		Depreciation of the buildings and improvements are calculated over lives ranging from the life of the lease to forty years.
VORNADO REALTY TRUST
SCHEDULE III
REAL ESTATE AND ACCUMULATED DEPRECIATION
(AMOUNTS IN THOUSANDS)
The following is a reconciliation of real estate assets and accumulated depreciation:
				Year Ended December 31,
				2014			2013			2012
	Real Estate
		Balance at beginning of period		$	17,418,946		$	17,365,533		$	15,444,754
		Additions during the period:
			Land		225,536			131,646			514,950
			Buildings & improvements		1,348,153			1,014,876			1,615,077
					18,992,635			18,512,055			17,574,781
		Less: Assets sold, written-off and deconsolidated			147,243			1,093,109			209,248
		Balance at end of period		$	18,845,392		$	17,418,946		$	17,365,533
	Accumulated Depreciation
		Balance at beginning of period		$	3,296,717		$	2,966,067		$	2,742,244
		Additions charged to operating expenses			461,689			423,844			427,189
					3,758,406			3,389,911			3,169,433
		Less: Accumulated depreciation on assets sold and written-off			129,271			93,194			203,366
		Balance at end of period		$	3,629,135		$	3,296,717		$	2,966,067

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2014
Basis of Presentation and Significant Accounting Policies [Abstract]
Basis of Presentation Policy
	Basis of Presentation
	The accompanying consolidated financial statements include the accounts of Vornado and its consolidated subsidiaries, including the Operating Partnership. All inter-company amounts have been eliminated. Our consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America, which require us to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates.
New Accounting Pronouncements Policy [Policy Text Block]	Recently Issued Accounting Literature
	In April 2014, the Financial Accounting Standards Board (“FASB”) issued an update (“ASU 2014-08”) Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity to ASC Topic 205, Presentation of Financial Statements and ASC Topic 360, Property Plant and Equipment. Under ASU 2014-08, only disposals that represent a strategic shift that has (or will have) a major effect on the entity's results and operations would qualify as discontinued operations. In addition, ASU 2014-08 expands the disclosure requirements for disposals that meet the definition of a discontinued operation and requires entities to disclose information about disposals of individually significant components that do not meet the definition of discontinued operations. ASU 2014-08 is effective for interim and annual reporting periods in fiscal years that begin after December 15, 2014. Upon adoption of this standard, individual properties sold in the ordinary course of business are not expected to qualify as discontinued operations. The financial results of our strip shopping centers and malls, which were spun off to UE on January 15, 2015, will be treated as a discontinued operation in the first quarter of 2015.
Real Estate [Policy Text Block]	2. Basis of Presentation and Significant Accounting Policies - continued
	Significant Accounting Policies
	Real Estate: Real estate is carried at cost, net of accumulated depreciation and amortization. Betterments, major renewals and certain costs directly related to the improvement and leasing of real estate are capitalized. Maintenance and repairs are expensed as incurred. For redevelopment of existing operating properties, the net book value of the existing property under redevelopment plus the cost for the construction and improvements incurred in connection with the redevelopment are capitalized to the extent the capitalized costs of the property do not exceed the estimated fair value of the redeveloped property when complete. If the cost of the redeveloped property, including the net book value of the existing property, exceeds the estimated fair value of redeveloped property, the excess is charged to expense. Depreciation is recognized on a straight-line basis over estimated useful lives which range from 7 to 40 years. Tenant allowances are amortized on a straight-line basis over the lives of the related leases, which approximate the useful lives of the assets. Additions to real estate include interest and debt expense capitalized during construction of $62,786,000 and $42,303,000 for the years ended December 31, 2014 and 2013, respectively.
	Upon the acquisition of real estate, we assess the fair value of acquired assets (including land, buildings and improvements, identified intangibles, such as acquired above and below-market leases, acquired in-place leases and tenant relationships) and acquired liabilities and we allocate the purchase price based on these assessments. We assess fair value based on estimated cash flow projections that utilize appropriate discount and capitalization rates and available market information. Estimates of future cash flows are based on a number of factors including historical operating results, known trends, and market/economic conditions. We record acquired intangible assets (including acquired above-market leases, acquired in-place leases and tenant relationships) and acquired intangible liabilities (including below–market leases) at their estimated fair value separate and apart from goodwill. We amortize identified intangibles that have finite lives over the period they are expected to contribute directly or indirectly to the future cash flows of the property or business acquired.
	Our properties, including any related intangible assets, are individually reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment exists when the carrying amount of an asset exceeds the aggregate projected future cash flows over the anticipated holding period on an undiscounted basis. An impairment loss is measured based on the excess of the property's carrying amount over its estimated fair value. Impairment analyses are based on our current plans, intended holding periods and available market information at the time the analyses are prepared. If our estimates of the projected future cash flows, anticipated holding periods, or market conditions change, our evaluation of impairment losses may be different and such differences could be material to our consolidated financial statements. The evaluation of anticipated cash flows is subjective and is based, in part, on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results. Plans to hold properties over longer periods decrease the likelihood of recording impairment losses.
Partially Owned Entities [Policy Text Block]	Partially Owned Entities: We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members as well as whether the entity is a variable interest entity (“VIE”) and we are the primary beneficiary. We are deemed to be the primary beneficiary of a VIE when we have (i) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (ii) the obligation to absorb losses or receive benefits that could potentially be significant to the VIE. We generally do not control a partially owned entity if the entity is not considered a VIE and the approval of all of the partners/members is contractually required with respect to major decisions, such as operating and capital budgets, the sale, exchange or other disposition of real property, the hiring of a chief executive officer, the commencement, compromise or settlement of any lawsuit, legal proceeding or arbitration or the placement of new or additional financing secured by assets of the venture. We account for investments under the equity method when the requirements for consolidation are not met, and we have significant influence over the operations of the investee. Equity method investments are initially recorded at cost and subsequently adjusted for our share of net income or loss and cash contributions and distributions each period. Investments that do not qualify for consolidation or equity method accounting are accounted for on the cost method.
	Investments in partially owned entities are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is measured based on the excess of the carrying amount of an investment over its estimated fair value. Impairment analyses are based on current plans, intended holding periods and available information at the time the analyses are prepared.
Mezzanine Loans Receivable [Policy Text Block]	Mortgage and Mezzanine Loans Receivable: We invest in mortgage and mezzanine loans of entities that have significant real estate assets. These investments are either secured by the real property or by pledges of the equity interests of the entities owning the underlying real estate. We record these investments at the stated principal amount net of any unamortized discount or premium. We accrete or amortize any discount or premium over the life of the related receivable utilizing the effective interest method or straight-line method, if the result is not materially different. We evaluate the collectibility of both interest and principal of each of our loans whenever events or changes in circumstances indicate such amounts may not be recoverable. A loan is impaired when it is probable that we will be unable to collect all amounts due according to the existing contractual terms. When a loan is impaired, the amount of the loss accrual is calculated by comparing the carrying amount of the investment to the present value of expected future cash flows discounted at the loan's effective interest rate, or as a practical expedient, to the value of the collateral if the loan is collateral dependent. Interest on impaired loans is recognized when received in cash.
Cash And Cash Equivalents [Policy Text Block]	Cash and Cash Equivalents: Cash and cash equivalents consist of highly liquid investments with original maturities of three months or less and are carried at cost, which approximates fair value due to their short-term maturities. The majority of our cash and cash equivalents consists of (i) deposits at major commercial banks, which may at times exceed the Federal Deposit Insurance Corporation limit, (ii) United States Treasury Bills, and (iii) Certificate of Deposits placed through an Account Registry Service (“CDARS”).
Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy	Restricted Cash: Restricted cash consists of security deposits, cash restricted for the purposes of facilitating a Section 1031 Like-Kind exchange, cash restricted in connection with our deferred compensation plan and cash escrowed under loan agreements for debt service, real estate taxes, property insurance and capital improvements.
Allowance For Doubtful Accounts [Policy Text Block]	Allowance for Doubtful Accounts: We periodically evaluate the collectibility of amounts due from tenants and maintain an allowance for doubtful accounts for estimated losses resulting from the inability of tenants to make required payments under the lease agreements. We also maintain an allowance for receivables arising from the straight-lining of rents. This receivable arises from earnings recognized in excess of amounts currently due under the lease agreements. Management exercises judgment in establishing these allowances and considers payment history and current credit status in developing these estimates. As of December 31, 2014 and 2013, we had $17,060,000 and $21,869,000, respectively, in allowances for doubtful accounts. In addition, as of December 31, 2014 and 2013, we had $3,188,000 and $4,355,000, respectively, in allowances for receivables arising from the straight-lining of rents.
Deferred Charges [Policy Text Block]	Deferred Charges: Direct financing costs are deferred and amortized over the terms of the related agreements as a component of interest expense. Direct costs related to successful leasing activities are capitalized and amortized on a straight line basis over the lives of the related leases. All other deferred charges are amortized on a straight line basis, which approximates the effective interest rate method, in accordance with the terms of the agreements to which they relate.
	Derivative Instruments and Hedging Activities: ASC 815, Derivatives and Hedging, as amended, establishes accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other contracts, and for hedging activities. As of December 31, 2014 and 2013, our derivative instruments consisted of an interest rate cap and an interest rate swap. We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative and the resulting designation. Derivatives used to hedge the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives used to hedge the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.
	For derivatives designated as fair value hedges, changes in the fair value of the derivative and the hedged item related to the hedged risk are recognized in earnings. For derivatives designated as cash flow hedges, the effective portion of changes in the fair value of the derivative is initially reported in other comprehensive income (loss) (outside of earnings) and subsequently reclassified to earnings when the hedged transaction affects earnings, and the ineffective portion of changes in the fair value of the derivative is recognized directly in earnings. We assess the effectiveness of each hedging relationship by comparing the changes in fair value or cash flows of the derivative hedging instrument with the changes in fair value or cash flows of the designated hedged item or transaction. For derivatives not designated as hedges, changes in fair value are recognized in earnings.
Revenue Recognition [Policy Text Block]	Revenue Recognition: We have the following revenue sources and revenue recognition policies:
	•       Base Rent — income arising from tenant leases. These rents are recognized over the non-cancelable term of the related leases on a straight-line basis which includes the effects of rent steps and rent abatements under the leases. We commence rental revenue recognition when the tenant takes possession of the leased space and the leased space is substantially ready for its intended use. In addition, in circumstances where we provide a tenant improvement allowance for improvements that are owned by the tenant, we recognize the allowance as a reduction of rental revenue on a straight-line basis over the term of the lease.
	•       Percentage Rent — income arising from retail tenant leases that is contingent upon tenant sales exceeding defined thresholds. These rents are recognized only after the contingency has been removed (i.e., when tenant sales thresholds have been achieved).
	•       Hotel Revenue — income arising from the operation of the Hotel Pennsylvania which consists of rooms revenue, food and beverage revenue, and banquet revenue. Income is recognized when rooms are occupied. Food and beverage and banquet revenue is recognized when the services have been rendered.
	•       Trade Shows Revenue — income arising from the operation of trade shows, including rentals of booths. This revenue is recognized when the trade shows have occurred.
	•       Expense Reimbursements — revenue arising from tenant leases which provide for the recovery of all or a portion of the operating expenses and real estate taxes of the respective property. This revenue is accrued in the same periods as the expenses are incurred.
	•       Management, Leasing and Other Fees — income arising from contractual agreements with third parties or with partially owned entities. This revenue is recognized as the related services are performed under the respective agreements.
	•       Cleveland Medical Mart — revenue arising from the development of the Cleveland Medical Mart. This revenue was recognized as the related services were performed under the respective agreements using the criteria set forth in ASC 605-25, Multiple Element Arrangements.
Income Tax [Policy Text Block]	Income Taxes: We operate in a manner intended to enable us to continue to qualify as a REIT under Sections 856-860 of the Internal Revenue Code of 1986, as amended. Under those sections, a REIT which distributes at least 90% of its REIT taxable income as a dividend to its shareholders each year and which meets certain other conditions will not be taxed on that portion of its taxable income which is distributed to its shareholders. We distribute to our shareholders 100% of our taxable income and therefore, no provision for Federal income taxes is required. Dividends distributed for the years ended December 31, 2014 and 2013, were characterized, for federal income tax purposes, as ordinary income. Dividend distributions for the year ended December 31, 2012, were characterized, for Federal income tax purposes, as 62.7% ordinary income and 37.3% long-term capital gain.
	We have elected to treat certain consolidated subsidiaries, and may in the future elect to treat newly formed subsidiaries, as taxable REIT subsidiaries pursuant to an amendment to the Internal Revenue Code that became effective January 1, 2001. Taxable REIT subsidiaries may participate in non-real estate related activities and/or perform non-customary services for tenants and are subject to Federal and State income tax at regular corporate tax rates.
Marketable Securities [Policy Text Block]
	Our portfolio of marketable securities is comprised of equity securities that are classified as available-for-sale. Available-for-sale securities are presented on our consolidated balance sheets at fair value. Unrealized gains and losses resulting from the mark-to-market of these securities are included in “other comprehensive income (loss).” Realized gains and losses are recognized in earnings only upon the sale of the securities and are recorded based on the weighted average cost of such securities.
	We evaluate our portfolio of marketable securities for impairment each reporting period. For each of the securities in our portfolio with unrealized losses, we review the underlying cause of the decline in value and the estimated recovery period, as well as the severity and duration of the decline. In our evaluation, we consider our ability and intent to hold these investments for a reasonable period of time sufficient for us to recover our cost basis. We also evaluate the near-term prospects for each of these investments in relation to the severity and duration of the decline.
Redeemable Noncontrolling Interests Policy [Text Block]	11. Redeemable Noncontrolling Interests
	Redeemable noncontrolling interests on our consolidated balance sheets are primarily comprised of Class A Operating Partnership units held by third parties and are recorded at the greater of their carrying amount or redemption value at the end of each reporting period. Changes in the value from period to period are charged to “additional capital” in our consolidated statements of changes in equity. Class A units may be tendered for redemption to the Operating Partnership for cash; we, at our option, may assume that obligation and pay the holder either cash or Vornado common shares on a one-for-one basis. Because the number of Vornado common shares outstanding at all times equals the number of Class A units owned by Vornado, the redemption value of each Class A unit is equivalent to the market value of one Vornado common share, and the quarterly distribution to a Class A unitholder is equal to the quarterly dividend paid to a Vornado common shareholder.
	Redeemable noncontrolling interests exclude our Series G Convertible Preferred units and Series D-13 Cumulative Redeemable Preferred units, as they are accounted for as liabilities in accordance with ASC 480, Distinguishing Liabilities and Equity, because of their possible settlement by issuing a variable number of Vornado common shares.

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Basis of Presentation and Significant Accounting Policies [Abstract]
Non Cash Impairment And Other Losses [Table Text Block]		(Amounts in thousands)			For the Year Ended December 31,
					2014			2013			2012
		Impairment losses		$	-		$	19,000		$	14,538
		Acquisition related costs			33,391			24,857	(1)		11,248
				$	33,391		$	43,857		$	25,786
		-1	Includes a $10,949 prepayment penalty in connection with the repayment of the mortgage loan upon the acquisition of 655 Fifth Avenue.
Reconciliation Of Net Income Attributable To Common Shareholders To Estimated Taxable Income [Table Text Block]		(Amounts in thousands)			For the Year Ended December 31,
					2014		2013			2012
		Net income attributable to common shareholders		$	783,388	$	392,034		$	549,271
		Book to tax differences (unaudited):
			Depreciation and amortization		219,403		155,401			205,155
			Impairment losses on marketable equity securities		-		37,236			211,328
			Straight-line rent adjustments		-77,526		-64,811			-64,679
			Earnings of partially owned entities		71,960		339,376			-60,049
			Stock options		-9,566		4,884			-28,701
			Sale of real estate		-477,061		-324,936			-123,905
			Derivatives		-		31,578			71,228
			Other, net		1,260		4,608			17,080
		Estimated taxable income (unaudited)		$	511,858	$	575,370		$	776,728

Vornado_Capital_Partners_Real_1

Vornado Capital Partners Real Estate Fund (the "Fund") (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate Fund [Abstract]
Schedule Of Income And Loss From The Fund [Table Text Block]	(Amounts in thousands)		For the Year Ended December 31,
			2014		2013		2012
	Net investment income		$	12,895	$	8,943	$	8,575
	Net realized gains			76,337		8,184		-
	Net unrealized gains			73,802		85,771		55,361
	Income from Real Estate Fund			163,034		102,898		63,936
	Less income attributable to noncontrolling interests			-92,728		-53,427		-39,332
	Income from Real Estate Fund attributable to Vornado (1)		$	70,306	$	49,471	$	24,604
	-1	Excludes $2,865, $2,992, and $3,278 of management and leasing fees in the years ended December 31, 2014, 2013 and 2012, respectively, which are included as a component of "fee and other income" on our consolidated statements of income.

Marketable_Securities_and_Deri1

Marketable Securities and Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Unrealized Gain (Loss) on Investments [Abstract]
Unrealized Gain (Loss) on Investments [Table Text Block]		Below is a summary of our marketable securities portfolio as of December 31, 2014 and 2013.
			As of December 31, 2014						As of December 31, 2013
					GAAP		Unrealized				GAAP		Unrealized
			Fair Value		Cost		Gain		Fair Value		Cost		Gain
	Equity securities:
		Lexington Realty Trust	$	202,789	$	72,549	$	130,240	$	188,567	$	72,549	$	116,018
		Other		3,534		-		3,534		3,350		59		3,291
			$	206,323	$	72,549	$	133,774	$	191,917	$	72,608	$	119,309

Investments_in_Partially_Owned1

Investments in Partially Owned Entities (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Summarized Financial Information [Table Text Block]		(Amounts in thousands)						Balance as of December 31,
		Balance Sheet:						2014			2013
			Assets					$	21,389,000		$	21,773,000
			Liabilities						17,986,000			17,982,000
			Noncontrolling interests						104,000			96,000
			Equity						3,299,000			3,695,000
					For the Year Ended December 31,
		Income Statement:			2014			2013			2012
			Total revenue		$	13,620,000		$	14,092,000		$	15,119,000
			Net (loss) income(1)			-434,000			-368,000			1,091,000
		-1	2012 includes a $600,000 net gain on sale of real estate.
Equity Method Investments [Table Text Block]										Percentage
	(Amounts in thousands)									Ownership at		As of December 31,
	Investments:									31-Dec-14		2014			2013
		Toys								32.60%		$	-		$	83,224
		Alexander’s								32.40%		$	131,616		$	167,785
		India real estate ventures								4.1%-36.5%			76,752			88,467
		Partially owned office buildings (1)								Various			760,749			621,294
		Other investments (2)								Various			277,379			288,897
												$	1,246,496		$	1,166,443
	______________________________________________________
	-1			Includes interests in 280 Park Avenue, 650 Madison Avenue, One Park Avenue, 666 Fifth Avenue (Office), 330 Madison Avenue and others.
	-2			Includes interests in Independence Plaza, Monmouth Mall, 85 Tenth Avenue, Fashion Center Mall, 50-70 West 93rd Street and others.
							Percentage
	(Amounts in thousands)						Ownership at			For the Year Ended December 31,
	Our Share of Net (Loss) Income:						31-Dec-14			2014			2013			2012
		Toys:
			Equity in net (loss) earnings					32.60%		$	-4,691		$	-128,919		$	45,267
			Non-cash impairment losses (see page 113 for details)								-75,196			-240,757			-40,000
			Management fees								6,331			7,299			9,592
										$	-73,556		$	-362,377		$	14,859
		Alexander's:
			Equity in net income					32.40%		$	21,287		$	17,721		$	24,709
			Management, leasing and development fees								8,722			6,681			13,748
			Net gain on sale of real estate								-			-			179,934
											30,009			24,402			218,391
		India real estate ventures (1)						4.1%-36.5%			-8,309			-3,533			-5,008
		Partially owned office buildings (2)						Various			93			-4,212			-3,770
		Other investments (3)						Various			-6,368			-10,817			103,644
		LNR (see page 115 for details):
			Equity in net income					n/a			-			42,186			66,270
			Impairment loss								-			-27,231			-
			Net gain on sale								-			3,776			-
											-			18,731			66,270
		Lexington (see page 112 for details): (4)						n/a
			Equity in net loss								-			-979			-23
			Net gain resulting from Lexington's stock issuance and asset
				acquisition							-			-			28,763
											-			-979			28,740
										$	15,425		$	23,592		$	408,267
	______________________________________________________
	-1			Includes a $5,771 non-cash impairment loss in 2014.
	-2			Includes interests in 280 Park Avenue, 650 Madison Avenue, One Park Avenue, 666 Fifth Avenue (Office), 330 Madison Avenue and others.
	-3			Includes interests in Independence Plaza, Monmouth Mall, 85 Tenth Avenue, Fashion Center Mall, 50-70 West 93rd Street and others. In the third quarter of 2014, we recognized a $10,263 non-cash charge, comprised of a $5,959 impairment loss and a $4,304 loan loss reserve, on our equity and debt investments in Suffolk Downs.
	-4			In the first quarter of 2013, we began accounting for our investment in Lexington as a marketable equity security - available for sale.
Schedule of debt of partially owned entities [Table Text Block]
			Below is a summary of the debt of our partially owned entities as of December 31, 2014 and 2013, none of which is recourse to us.
				Percentage				Interest
				Ownership at				Rate at		100% Partially Owned Entities’
	(Amounts in thousands)			December 31,				December 31,		Debt at December 31,
				2014		Maturity		2014		2014			2013
	Toys:
		Notes, loans and mortgages payable		32.60%		2015-2021		7.23%		$	5,748,350		$	5,702,247
	Alexander's:
		Mortgages payable		32.40%		2015-2021		2.59%		$	1,032,780		$	1,049,959
	Partially owned office buildings(1):
		Mortgages payable		Various		2015-2023		5.59%		$	3,691,274		$	3,622,759
	India Real Estate Ventures:
		TCG Urban Infrastructure Holdings mortgages
			payable	25.00%		2015-2026		13.25%		$	183,541		$	199,021
	Other(2):
		Mortgages payable		Various		2015-2023		4.33%		$	1,480,485		$	1,709,509
	-1		Includes 280 Park Avenue, 650 Madison Avenue, One Park Avenue, 666 Fifth Avenue (Office), 330 Madison Avenue and others.
	-2		Includes Independence Plaza, Monmouth Mall, Fashion Center Mall, 50-70 West 93rd Street and others.
Toys R Us [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Summarized Financial Information [Table Text Block]		(Amounts in thousands)						Balance as of
		Balance Sheet:						1-Nov-14			2-Nov-13
			Assets					$	11,267,000		$	11,756,000
			Liabilities						10,377,000			10,437,000
			Noncontrolling interests						82,000			75,000
			Toys “R” Us, Inc. equity (1)						808,000			1,244,000
					For the Twelve Months Ended
		Income Statement:			1-Nov-14			2-Nov-13			27-Oct-12
			Total revenues		$	12,645,000		$	13,046,000		$	13,698,000
			Net (loss) income attributable to Toys			-343,000			-396,000			138,000
		-1		At December 31, 2014, the carrying amount of our investment in Toys is less than our share of Toys' equity by approximately $263,455. This basis difference results primarily from non-cash impairment losses aggregating $355,953 that we have recognized through December 31, 2014. We have allocated the basis difference primarily to Toys' real estate, which is being amortized over its remaining estimated useful life.
Alexanders Inc [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Summarized Financial Information [Table Text Block]		(Amounts in thousands)								Balance as of December 31,
		Balance Sheet:								2014			2013
			Assets							$	1,423,000		$	1,458,000
			Liabilities								1,075,000			1,124,000
			Stockholders' equity								348,000			334,000
							For the Year Ended December 31,
		Income Statement:					2014			2013			2012
			Total revenues				$	201,000		$	196,000		$	191,000
			Net income attributable to Alexander’s (1)					68,000			57,000			674,000
		-1	2012 includes a $600,000 net gain on sale of real estate.

Dispositions_Tables

Dispositions (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Schedule Of Assets And Liabilities And Results Of Operations Related To Discontinued Operations			Assets Related to				Liabilities Related to
		(Amounts in thousands)	Discontinued Operations as of				Discontinued Operations as of
			December 31,				December 31,
			2014		2013		2014		2013
		Retail	$	477,620	$	735,888	$	211	$	14,709
		New York		-		138,162		-		-
		Total	$	477,620	$	874,050	$	211	$	14,709
		(Amounts in thousands)			For the Year Ended December 31,
					2014		2013		2012
		Total revenues			$	70,593	$	129,860	$	264,878
		Total expenses				36,424		79,458		190,450
						34,169		50,402		74,428
		Net gains on sales of real estate				507,192		414,502		245,799
		Impairment losses				-26,518		-18,170		-119,439
		Gain on sale of Canadian Trade Shows, net of $11,448 of income taxes				-		-		19,657
		Income from discontinued operations			$	514,843	$	446,734	$	220,445

Identified_Intangible_Assets_a1

Identified Intangible Assets and Intangible Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Schedule of Identified Intangible Assets and Intangible Liabilities (Table)			Balance as of December 31,
		(Amounts in thousands)	2014		2013
		Identified intangible assets:
		Gross amount	$	502,080	$	583,862
		Accumulated amortization		-225,841		-276,426
		Net	$	276,239	$	307,436
		Identified intangible liabilities (included in deferred revenue):
		Gross amount	$	885,763	$	855,860
		Accumulated amortization		-396,895		-359,371
		Net	$	488,868	$	496,489
Below Market Leases Net Of Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]		(Amounts in thousands)
		2015	$	57,202
		2016		45,333
		2017		42,457
		2018		41,311
		2019		30,950
Other Identified Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]		(Amounts in thousands)
		2015	$	27,210
		2016		21,437
		2017		17,859
		2018		13,533
		2019		11,553
Tenant Under Ground Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]		(Amounts in thousands)
		2015	$	3,363
		2016		3,363
		2017		3,363
		2018		3,363
		2019		3,363

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Debt						Weighted Average
						Interest Rate at			Balance at December 31,
		(Amounts in thousands)				31-Dec-14			2014		2013
		Mortgages Payable:
			Fixed rate				4.45%	$	7,710,931	$	7,563,133
			Variable rate				2.20%		1,840,769		768,860
							4.02%	$	9,551,700	$	8,331,993
		Unsecured Debt:
			Senior unsecured notes				3.89%	$	1,347,159	$	1,350,855
			Unsecured revolving credit facilities				-		-		295,870
							3.89%	$	1,347,159	$	1,646,725
Schedule of Maturities of Long-Term Debt Table Text Block							Senior Unsecured
							Debt and
		(Amounts in thousands)					Revolving Credit
		Year Ending December 31,			Mortgages Payable		Facilities
		2015		$	433,699	$	500,000
		2016			1,552,419		-
		2017			626,525		-
		2018			340,442		-
		2019			996,579		450,000
		Thereafter			5,601,148		400,000

Redeemable_Noncontrolling_Inte1

Redeemable Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2014
Redeemable Noncontrolling Interests [Abstract]
Operating Partnership Units Held By Third Parties
	(Amounts in thousands, except units and											Preferred or
	per unit amounts)			Balance as of				Units Outstanding at		Per Unit		Annual
				December 31,				December 31,		Liquidation		Distribution
	Unit Series			2014			2013	2014	2013	Preference		Rate
	Common:
		Class A		$	1,336,780	$	1,002,620	11,356,550	11,292,038		n/a	$	2.92
	Perpetual Preferred: (1)
		5.00% D-16 Cumulative Redeemable		$	1,000	$	1,000	1	1	$	1,000,000.00	$	50,000.00
	-1	Holders may tender units for redemption to the Operating Partnership for cash at their stated redemption amount; we, at our option, may assume that obligation and pay the holders either cash or Vornado preferred shares on a one-for-one basis. These units are redeemable at our option at any time.
Summary Of Activity Of Redeemable Noncontrolling Interests	Below is a table summarizing the activity of redeemable noncontrolling interests.
		(Amounts in thousands)
		Balance at December 31, 2012	$	944,152
		Net income		24,817
		Other comprehensive income		5,296
		Distributions		-34,053
		Redemption of Class A units for common shares, at redemption value		-25,317
		Adjustments to carry redeemable Class A units at redemption value		108,252
		Redemption of Series D-15 redeemable units		-36,900
		Other, net		17,373
		Balance at December 31, 2013		1,003,620
		Net income		47,613
		Other comprehensive income		1,323
		Distributions		-33,469
		Redemption of Class A units for common shares, at redemption value		-27,273
		Adjustments to carry redeemable Class A units at redemption value		315,276
		Other, net		30,690
		Balance at December 31, 2014	$	1,337,780

Shareholders_Equity_Tables

Shareholder's Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Sharholders Equity [Abstract]
Schedule Of Preferred Units [Table Text Block]	(Amounts in thousands, except share and		Balance as of						Shares Outstanding at			Per Share		Annual
	per share amounts)		December 31,						December 31,			Liquidation		Dividend
	Preferred Shares		2014			2013			2014		2013	Preference		Rate(1)
	Convertible Preferred:
		6.5% Series A: authorized 83,977 shares(2)	$	1,393		$	1,592		28,939		32,807	$	50	$	3.25
	Cumulative Redeemable:
		6.625% Series G: authorized 8,000,000 shares(3)		193,135			193,135		8,000,000		8,000,000	$	25	$	1.65625
		6.625% Series I: authorized 10,800,000 shares(3)		262,379			262,379		10,800,000		10,800,000	$	25	$	1.65625
		6.875% Series J: authorized 9,850,000 shares(3)		238,842			238,842		9,850,000		9,850,000	$	25	$	1.71875
		5.70% Series K: authorized 12,000,000 shares(3)		290,971			290,971		12,000,000		12,000,000	$	25	$	1.425
		5.40% Series L: authorized 12,000,000 shares(3)		290,306			290,306		12,000,000		12,000,000	$	25	$	1.35
			$	1,277,026		$	1,277,225		52,678,939		52,682,807
	-1	Dividends on preferred shares are cumulative and are payable quarterly in arrears.
	-2	Redeemable at our option under certain circumstances, at a redemption price of 1.4334 common shares per Series A Preferred Share plus accrued and unpaid dividends through the date of redemption, or convertible at any time at the option of the holder for 1.4334 common shares per Series A Preferred Share.
	-3	Redeemable at our option at a redemption price of $25.00 per share, plus accrued and unpaid dividends through the date of redemption.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]				For the Year Ended December 31, 2014
							Securities			Pro rata share of		Interest
							available-			nonconsolidated		rate
	(Amounts in thousands)			Total			for-sale			subsidiaries' OCI		swap		Other
	Balance as of December 31, 2013			$	71,537		$	119,309		$	-11,501	$	-31,882	$	-4,389
	Net current period OCI				21,730			14,465			2,509		6,079		-1,323
	Balance as of December 31, 2014			$	93,267		$	133,774		$	-8,992	$	-25,803	$	-5,712

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Schedule of Fair Values of Financial Assets and Liabilities by Levels [Table Text Block]				As of December 31, 2014
	(Amounts in thousands)			Total			Level 1			Level 2			Level 3
		Marketable securities		$	206,323		$	206,323		$	-		$	-
		Real Estate Fund investments (75% of which is attributable to
			noncontrolling interests)		513,973			-			-			513,973
		Deferred compensation plan assets (included in other assets)			117,284			53,969			-			63,315
			Total assets	$	837,580		$	260,292		$	-		$	577,288
		Mandatorily redeemable instruments (included in other liabilities)		$	55,097		$	55,097		$	-		$	-
		Interest rate swap (included in other liabilities)			25,797			-			25,797			-
			Total liabilities	$	80,894		$	55,097		$	25,797		$	-
				As of December 31, 2013
	(Amounts in thousands)			Total			Level 1			Level 2			Level 3
		Marketable securities		$	191,917		$	191,917		$	-		$	-
		Real Estate Fund investments (75% of which is attributable to
			noncontrolling interests)		667,710			-			-			667,710
		Deferred compensation plan assets (included in other assets)			116,515			47,733			-			68,782
			Total assets	$	976,142		$	239,650		$	-		$	736,492
		Mandatorily redeemable instruments (included in other liabilities)		$	55,097		$	55,097		$	-		$	-
		Interest rate swap (included in other liabilities)			31,882			-			31,882			-
			Total liabilities	$	86,979		$	55,097		$	31,882		$	-
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]									Weighted Average
									(based on fair
		Unobservable Quantitative Input					Range		value of investments)
			Discount rates				12.0% to 17.5%		13.70%
			Terminal capitalization rates				4.7% to 6.5%		5.30%
Non-financial Assets Measured at Fair Value on a Nonrecurring Basis [Table Text Block]					As of December 31, 2014
		(Amounts in thousands)			Total			Level 1			Level 2			Level 3
			Real estate assets		$	4,848		$	-		$	-		$	4,848
					As of December 31, 2013
		(Amounts in thousands)			Total			Level 1			Level 2			Level 3
			Real estate assets		$	354,341		$	-		$	-		$	354,341
			Investment in Toys			83,224			-			-			83,224
				Total assets	$	437,565		$	-		$	-		$	437,565
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments [Table Text Block]						As of December 31, 2014						As of December 31, 2013
						Carrying			Fair			Carrying			Fair
		(Amounts in thousands)				Amount			Value			Amount			Value
				Cash equivalents		$	749,418		$	749,000		$	295,000		$	295,000
				Mortgage and mezzanine loans receivable
					(included in other assets)		16,748			17,000			170,972			171,000
						$	766,166		$	766,000		$	465,972		$	466,000
			Debt:
				Mortgages payable		$	9,551,700		$	9,551,000		$	8,331,993		$	8,104,000
				Senior unsecured notes			1,347,159			1,385,000			1,350,855			1,402,000
				Revolving credit facility debt			-			-			295,870			296,000
						$	10,898,859		$	10,936,000		$	9,978,718		$	9,802,000
Real Estate Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Summary of Changes in Level 3 Plan Assets [Table Text Block]					Real Estate Fund Investments
					For The Year Ended December 31,
		(Amounts in thousands)			2014			2013
		Beginning balance			$	667,710		$	600,786
		Purchases				3,392			43,816
		Dispositions / Distributions				-307,268			-70,848
		Net unrealized gains				73,802			85,771
		Net realized gains				76,337			8,184
		Other, net				-			1
		Ending balance			$	513,973		$	667,710
Deferred Compensation Plan Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Summary of Changes in Level 3 Plan Assets [Table Text Block]					Deferred Compensation Plan Assets
					For The Year Ended December 31,
		(Amounts in thousands)			2014			2013
		Beginning balance			$	68,782		$	62,631
		Purchases				14,162			5,018
		Sales				-24,951			-7,306
		Realized and unrealized gains				3,415			7,189
		Other, net				1,907			1,250
		Ending balance			$	63,315		$	68,782

Stockbased_Compensation_Tables

Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule Of Share Based Compensation Stock Options Activity [Table Text Block]									Weighted-
						Weighted-			Average
						Average			Remaining	Aggregate
						Exercise			Contractual	Intrinsic
				Shares		Price			Term	Value
		Outstanding at January 1, 2014		3,248,699		$	67.51
		Granted		49,088			91.32
		Exercised		-434,204			67.27
		Cancelled or expired		-43,468			104.74
		Outstanding at December 31, 2014		2,820,115		$	67.38		4.6	$	145,317,000
		Options vested and expected to vest at
			31-Dec-14	2,818,587		$	67.37		4.6	$	145,271,000
		Options exercisable at December 31, 2014		2,606,260		$	65.62		4.4	$	138,912,000
Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]			December 31,
			2014		2013		2012
		Expected volatility	36.00%		36.00%		36.00%
		Expected life	5.0 years		5.0 years		5.0 years
		Risk free interest rate	1.81%		0.91%		1.05%
		Expected dividend yield	4.10%		4.30%		4.30%
Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity [Table Text Block]							Weighted-Average
							Grant-Date
		Unvested Shares			Shares		Fair Value
			Unvested at January 1, 2014		29,664		$	79.24
			Granted		11,475			91.31
			Vested		-15,733			74.61
			Cancelled or expired		-2,957			87.42
			Unvested at December 31, 2014		22,449			87.58
Schedule Of Sharebased Compensation Restricted Operating Partnership Units Activity [Table Text Block]
							Weighted-Average
							Grant-Date
		Unvested Units			Units		Fair Value
			Unvested at January 1, 2014		765,971		$	76.27
			Granted		226,638			86.79
			Vested		-327,555			69.48
			Cancelled or expired		-6,575			83.16
			Unvested at December 31, 2014		658,479			83.2

Fee_and_Other_Income_Tables

Fee and Other Income (Tables)	12 Months Ended
	Dec. 31, 2014
Fee And Other Income Tables [Abstract]
Fee and Other Income (Table)
	(Amounts in thousands)		For the Year Ended December 31,
			2014		2013		2012
	BMS cleaning fees		$	85,658	$	66,505	$	67,584
	Signage revenue			37,929		32,866		20,892
	Management and leasing fees			21,382		24,637		21,849
	Lease termination fees(1)			17,042		92,497		2,361
	Other income			33,734		34,113		31,438
			$	195,745	$	250,618	$	144,124
	__________________________
	-1	The year ended December 31, 2013 includes (i) $59,599 of income pursuant to a settlement agreement with Stop & Shop, which terminates our right to receive $6,000 of additional annual rent under a 1992 agreement, for a period potentially through 2031, (ii) $19,500 from a tenant at 1290 Avenue of the Americas, of which our 70% share, net of a $1,529 write-off of the straight lining of rents, was $12,121, and (iii) $3,000 from the termination of our subsidiaries' agreements with Cuyahoga County to operate the Cleveland Medical Mart Convention Center.

Interest_and_Other_Investment_1

Interest and Other Investment Income (Loss), Net (Tables)	12 Months Ended
	Dec. 31, 2014
Interest and Other Investment (Loss) Income, net [Abstract]
Schedule Of Interest And Other Investment Income Net [Table Text Block]
	(Amounts in thousands)		For the Year Ended December 31,
			2014		2013		2012
	Dividends and interest on marketable securities		$	12,707	$	11,446	$	11,979
	Mark-to-market of investments in our deferred compensation plan (1)			11,557		10,636		6,809
	Interest on mezzanine loans receivable			3,920		19,495		13,861
	Losses from the disposition of investment in J.C. Penney			-		-72,974		-300,752
	Other, net			10,603		6,521		6,924
			$	38,787	$	-24,876	$	-261,179
	__________________________
	-1	This income is entirely offset by the expense resulting from the mark-to-market of the deferred compensation plan liability, which is included in "general and administrative" expense.

Interest_and_Debt_Expense_Tabl

Interest and Debt Expense (Tables)	12 Months Ended
	Dec. 31, 2014
Interest Expense Debt [Abstract]
Interest And Debt Expense [Table Text Block]
	(Amounts in thousands)	For the Year Ended December 31,
		2014		2013		2012
	Interest expense	$	483,578	$	498,050	$	478,688
	Amortization of deferred financing costs		46,923		25,557		22,907
	Capitalized interest and debt expense		-62,786		-42,303		-16,801
		$	467,715	$	481,304	$	484,794

Income_Per_Share_Tables

Income Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Income Per Share [Abstract]
Schedule Of Earnings Per Share Basic And Diluted [Text Block]
	(Amounts in thousands, except per share amounts)			Year Ended December 31,
				2014		2013		2012
	Numerator:
		Income from continuing operations, net of income attributable to noncontrolling interests		$	379,333	$	57,727	$	408,439
		Income from discontinued operations, net of income attributable to noncontrolling
			interests		485,519		418,244		208,821
		Net income attributable to Vornado			864,852		475,971		617,260
		Preferred share dividends			-81,464		-82,807		-76,937
		Preferred unit and share redemptions			-		-1,130		8,948
		Net income attributable to common shareholders			783,388		392,034		549,271
		Earnings allocated to unvested participating securities			-125		-110		-202
		Numerator for basic income per share			783,263		391,924		549,069
		Impact of assumed conversions:
			Convertible preferred share dividends		97		-		113
		Numerator for diluted income per share		$	783,360	$	391,924	$	549,182
	Denominator:
		Denominator for basic income per share – weighted average shares			187,572		186,941		185,810
		Effect of dilutive securities (1):
			Employee stock options and restricted share awards		1,075		768		670
			Convertible preferred shares		43		-		50
		Denominator for diluted income per share – weighted average shares and
			assumed conversions		188,690		187,709		186,530
	INCOME (LOSS) PER COMMON SHARE – BASIC:
		Income (loss) from continuing operations, net		$	1.59	$	-0.14	$	1.83
		Income from discontinued operations, net			2.59		2.24		1.12
		Net income per common share		$	4.18	$	2.1	$	2.95
	INCOME (LOSS) PER COMMON SHARE – DILUTED:
		Income (loss) from continuing operations, net		$	1.58	$	-0.14	$	1.82
		Income from discontinued operations, net			2.57		2.23		1.12
		Net income per common share		$	4.15	$	2.09	$	2.94
	-1		The effect of dilutive securities in the years ended December 31, 2014, 2013 and 2012 excludes an aggregate of 11,238, 11,752 and 14,400 weighted average common share equivalents, respectively, as their effect was anti-dilutive.

Leases_Tables

Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Leases [Abstract]
Schedule Of Future Base Rental [Table Text Block]
		(Amounts in thousands)
		Year Ending December 31:
		2015	$	1,783,293
		2016		1,717,984
		2017		1,671,172
		2018		1,578,671
		2019		1,399,001
		Thereafter		8,055,804
Schedule Of Future Minimum Rental Payments For Operating Leases [Table Text Block]
		(Amounts in thousands)
		Year Ending December 31:
		2015	$	39,925
		2016		39,833
		2017		41,003
		2018		38,920
		2019		38,992
		Thereafter		1,252,109
Schedule Of Future Minimum Lease Payments For Capital Leases [Table Text Block]
		(Amounts in thousands)
		Year Ending December 31:
		2015	$	12,500
		2016		12,500
		2017		12,500
		2018		12,500
		2019		12,500
		Thereafter		334,792
		Total minimum obligations		397,292
		Interest portion		-157,292
		Present value of net minimum payments	$	240,000

Summary_of_Quarterly_Results_T

Summary of Quarterly Results (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Schedule Of Quarterly Financial Information Table Text Block							Net Income (Loss)
							Attributable		Net Income (Loss) Per
							to Common		Common Share (2)
		(Amounts in thousands, except per share amounts)			Revenues		Shareholders (1)		Basic		Diluted
			2014
				31-Dec	$	679,101	$	513,238	$	2.73	$	2.72
				30-Sep		657,209		131,159		0.7		0.69
				30-Jun		652,972		76,642		0.41		0.41
				31-Mar		646,658		62,349		0.33		0.33
			2013
				31-Dec	$	649,403	$	-68,887	$	-0.37	$	-0.37
				30-Sep		655,883		83,005		0.44		0.44
				30-Jun		658,550		145,926		0.78		0.78
				31-Mar		705,433		231,990		1.24		1.24
	_______________________________
		-1		Fluctuations among quarters resulted primarily from non-cash impairment losses, mark-to-market of derivative instruments, net gains on sale of real estate and from seasonality of business operations.
		-2		The total for the year may differ from the sum of the quarters as a result of weighting.

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Information
	(Amounts in thousands)			For the Year Ended December 31, 2014
													Retail
					Total		New York			Washington, DC			Properties			Toys		Other
	Total revenues				$	2,635,940	$	1,520,845		$	537,151		$	326,947		$	-	$	250,997
	Total expenses					1,820,298		946,466			358,019			197,206			-		318,607
	Operating income (loss)					815,642		574,379			179,132			129,741			-		-67,610
	(Loss) income from partially owned
		entities, including Toys				-58,131		20,701			-3,677			1,730			-73,556		-3,329
	Income from Real Estate Fund					163,034		-			-			-			-		163,034
	Interest and other investment
		income, net				38,787		6,711			183			35			-		31,858
	Interest and debt expense					-467,715		-183,427			-75,395			-54,754			-		-154,139
	Net gain on disposition of wholly
		owned and partially owned assets				13,568		-			-			-			-		13,568
	Income (loss) before income taxes					505,185		418,364			100,243			76,752			-73,556		-16,618
	Income tax expense					-11,002		-4,305			-242			-1,721			-		-4,734
	Income (loss) from continuing
		operations				494,183		414,059			100,001			75,031			-73,556		-21,352
	Income from discontinued
		operations				514,843		463,163			-			50,873			-		807
	Net income (loss)					1,009,026		877,222			100,001			125,904			-73,556		-20,545
	Less net income attributable to
		noncontrolling interests				-144,174		-8,626			-			-119			-		-135,429
	Net income (loss) attributable to
		Vornado				864,852		868,596			100,001			125,785			-73,556		-155,974
	Interest and debt expense(2)					654,398		241,959			89,448			59,322			100,549		163,120
	Depreciation and amortization(2)					685,973		324,239			145,853			73,433			64,533		77,915
	Income tax expense(2)					24,248		4,395			288			1,721			12,106		5,738
	EBITDA(1)				$	2,229,471	$	1,439,189	(3)	$	335,590	(4)	$	260,261	(5)	$	103,632	$	90,799	(6)
	Balance Sheet Data:
	Real estate at cost				$	18,845,392	$	9,732,818		$	4,383,418		$	2,057,374			-	$	2,671,782
	Investments in partially owned entities					1,246,496		1,036,130			102,635			6,007			-		101,724
	Total assets					21,248,320		10,752,763			4,310,974			3,580,803			-		2,603,780
	See notes on pages 141 and 142.
	(Amounts in thousands)			For the Year Ended December 31, 2013
													Retail
					Total		New York			Washington, DC			Properties			Toys		Other
	Total revenues				$	2,669,269	$	1,470,907		$	541,161		$	372,435		$	-	$	284,766
	Total expenses					1,819,009		910,498			347,686			199,650			-		361,175
	Operating income (loss)					850,260		560,409			193,475			172,785			-		-76,409
	(Loss) income from partially owned
		entities, including Toys				-338,785		15,527			-6,968			2,097			-362,377		12,936
	Income from Real Estate Fund					102,898		-			-			-			-		102,898
	Interest and other investment
		(loss) income, net				-24,876		5,357			129			11			-		-30,373
	Interest and debt expense					-481,304		-181,966			-102,277			-55,219			-		-141,842
	Net gain on disposition of wholly
		owned and partially owned assets				3,407		-			-			1,377			-		2,030
	Income (loss) before income taxes					111,600		399,327			84,359			121,051			-362,377		-130,760
	Income tax benefit (expense)					6,406		-2,794			14,031			-2,311			-		-2,520
	Income (loss) from continuing
		operations				118,006		396,533			98,390			118,740			-362,377		-133,280
	Income (loss) from discontinued
		operations				446,734		160,314			-			287,067			-		-647
	Net income (loss)					564,740		556,847			98,390			405,807			-362,377		-133,927
	Less net income attributable to
		noncontrolling interests				-88,769		-10,786			-			-3,065			-		-74,918
	Net income (loss) attributable to
		Vornado				475,971		546,061			98,390			402,742			-362,377		-208,845
	Interest and debt expense(2)					758,781		236,645			116,131			63,803			181,586		160,616
	Depreciation and amortization(2)					732,757		293,974			142,409			72,161			135,178		89,035
	Income tax expense (benefit)(2)					26,371		3,002			-15,707			2,311			33,532		3,233
	EBITDA(1)				$	1,993,880	$	1,079,682	(3)	$	341,223	(4)	$	541,017	(5)	$	-12,081	$	44,039	(6)
Balance Sheet Data:
Real estate at cost				$	17,418,946	$	8,422,297		$	4,243,048		$	2,060,093		$	-	$	2,693,508
Investments in partially owned entities					1,249,667		904,278			100,543			6,640			83,224		154,982
Total assets					20,097,224		9,255,964			4,107,636			3,374,896			83,224		3,275,504
See notes on page 141 and 142.
(Amounts in thousands)			For the Year Ended December 31, 2012
												Retail
				Total		New York			Washington, DC			Properties			Toys		Other
Total revenues				$	2,649,217	$	1,319,470		$	554,028		$	318,566		$	-	$	457,153
Total expenses					1,921,425		835,563			360,056			189,480			-		536,326
Operating income (loss)					727,792		483,907			193,972			129,086			-		-79,173
Income (loss) from partially owned
	entities, including Toys				423,126		207,773			-5,612			1,458			14,859		204,648
Income from Real Estate Fund					63,936		-			-			-			-		63,936
Interest and other investment
	(loss) income, net				-261,179		4,002			126			21			-		-265,328
Interest and debt expense					-484,794		-146,350			-115,574			-53,772			-		-169,098
Net gain on disposition of wholly
	owned and partially owned assets				13,347		-			-			8,491			-		4,856
Income (loss) before income taxes					482,228		549,332			72,912			85,284			14,859		-240,159
Income tax expense					-8,132		-3,491			-1,650			-			-		-2,991
Income (loss) from continuing
	operations				474,096		545,841			71,262			85,284			14,859		-243,150
Income (loss) from discontinued
	operations				220,445		30,293			167,766			-52,561			-		74,947
Net income (loss)					694,541		576,134			239,028			32,723			14,859		-168,203
Less net (income) loss attributable to
	noncontrolling interests				-77,281		-2,138			-			1,812			-		-76,955
Net income (loss) attributable to
	Vornado				617,260		573,996			239,028			34,535			14,859		-245,158
Interest and debt expense(2)					760,523		187,855			133,625			79,462			147,880		211,701
Depreciation and amortization(2)					735,293		252,257			157,816			86,529			135,179		103,512
Income tax expense (benefit)(2)					7,026		3,751			1,943			-			-16,629		17,961
EBITDA(1)				$	2,120,102	$	1,017,859	(3)	$	532,412	(4)	$	200,526	(5)	$	281,289	$	88,016	(6)
Balance Sheet Data:
Real estate at cost				$	17,365,533	$	8,687,141		$	4,171,879		$	2,108,328		$	-	$	2,398,185
Investments in partially owned entities					1,704,297		576,336			95,670			7,083			478,041		547,167
Total assets					22,065,049		9,215,438			4,196,694			3,583,999			478,041		4,590,877
See notes on page 141 and 142.
	Notes to preceding tabular information:
-1	EBITDA represents "Earnings Before Interest, Taxes, Depreciation and Amortization." We consider EBITDA a supplemental measure for making decisions and assessing the unlevered performance of our segments as it relates to the total return on assets as opposed to the levered return on equity. As properties are bought and sold based on a multiple of EBITDA, we utilize this measure to make investment decisions as well as to compare the performance of our assets to that of our peers. EBITDA should not be considered a substitute for net income. EBITDA may not be comparable to similarly titled measures employed by other companies.
-2	Interest and debt expense, depreciation and amortization and income tax expense (benefit) in the reconciliation of net income (loss) to EBITDA includes our share of these items from partially owned entities.
-3	The elements of "New York" EBITDA are summarized below.
						For the Year Ended December 31,
	(Amounts in thousands)					2014			2013			2012
	Office(a)					$	1,085,262		$	759,941		$	568,518
	Retail						281,428			246,808			189,484
	Alexander's(b)						41,746			42,210			231,402
	Hotel Pennsylvania						30,753			30,723			28,455
		Total New York				$	1,439,189		$	1,079,682		$	1,017,859
	(a)		2014 and 2013 includes $440,537 and $127,512 net gains on sale of real estate, respectively.
	(b)		2012 includes $179,934 for our share of net gain on sale of Kings Plaza.
-4	The elements of "Washington, DC" EBITDA are summarized below.
						For the Year Ended December 31,
	(Amounts in thousands)					2014			2013			2012
	Office, excluding the Skyline Properties (a)					$	266,859		$	268,373		$	449,448
	Skyline properties						27,150			29,499			40,037
		Total Office					294,009			297,872			489,485
	Residential						41,581			43,351			42,927
		Total Washington, DC				$	335,590		$	341,223		$	532,412
	(a)		2012 includes $163,367 of net gains on sale of real estate.
-5	The elements of "Retail Properties" EBITDA are summarized below.
						For the Year Ended December 31,
	(Amounts in thousands)					2014			2013			2012
	Strip shopping centers(a)					$	219,122		$	285,612		$	172,708
	Regional malls(b)						41,139			255,405			27,818
		Total Retail properties				$	260,261		$	541,017		$	200,526
	(a)		2014 includes $66,023 of net gains on sale of real estate and $5,676 of impairment losses. 2013 includes $81,806 of net gains on sale of real estate, $59,599 of income pursuant to a settlement agreement with Stop & Shop and a $19,000 real estate impairment loss. 2012 includes $15,821 of net gains on sale of real estate and a $33,775 real estate impairment loss.
	(b)		2014 includes $20,842 of impairment losses. 2013 includes a $202,275 net gain on sale of the Green Acres Mall and a $13,443 real estate impairment loss. 2012 includes a $70,100 real estate impairment loss.
Details of Other EBITDA (Table)
		Notes to preceding tabular information:
	-6	The elements of "other" EBITDA from continuing operations are summarized below.
		(Amounts in thousands)					For the Year Ended December 31,
							2014			2013				2012
		Our share of Real Estate Fund:
			Income before net realized/unrealized gains				$	8,056		$	7,752		$	6,385
			Net realized/unrealized gains on investments					37,535			23,489			13,840
			Carried interest					24,715			18,230			4,379
		Total						70,306			49,471			24,604
		The Mart and trade shows						79,636			74,270			62,470
		555 California Street						48,844			42,667			46,167
		India real estate ventures						6,434			5,841			3,654
		LNR(a)						-			20,443			75,202
		Lexington(b)						-			6,931			32,595
		Other investments						17,270			18,981			25,612
								222,490			218,604			270,304
		Corporate general and administrative expenses(c)						-94,929			-94,904			-89,082
		Investment income and other, net(c)						31,665			46,525			45,563
		Acquisition and transaction related costs, and impairment losses(d)						-31,348			-24,857			-17,386
		Net gain on sale of marketable securities, land parcels and residential
			condominiums					13,568			56,868			4,856
		Our share of debt satisfaction gains and net gains on sale of real estate
			of partially owned entities					13,000			-			-
		Suffolk Downs impairment loss and loan reserve						-10,263			-			-
		Our share of impairment losses of partially owned entities						-5,771			-			-4,936
		Losses from the disposition of investment in J.C. Penney						-			-127,888			-300,752
		Severance costs (primarily reduction in force at the Mart)						-			-5,492			-3,005
		Purchase price fair value adjustment and accelerated amortization of
			discount on investment in subordinated debt of Independence Plaza					-			-			105,366
		The Mart discontinued operations						-			-			93,588
		Net gain resulting from Lexington's stock issuance and asset acquisition						-			-			28,763
		Net income attributable to noncontrolling interests in the Operating Partnership						-47,563			-23,659			-35,327
		Preferred unit distributions of the Operating Partnership						-50			-1,158			-9,936
							$	90,799		$	44,039		$	88,016
		(a)		On April 19, 2013, LNR was sold.
		(b)		In the first quarter of 2013, we began accounting for our investment in Lexington as a marketable equity security - available for sale. This investment was previously accounted for under the equity method (see page 112 for details).
		(c)		The amounts in these captions (for this table only) exclude income/expense from the mark-to-market of our deferred compensation plan of $11,557, $10,636 and $6,809 for the years ended December 31, 2014, 2013 and 2012, respectively.
		(d)		The year ended December 31, 2014, includes $14,956 of transaction costs related to the spin-off of our strip shopping centers and malls.

Organization_and_Business_Deta

Organization and Business (Details) (USD $)	12 Months Ended	0 Months Ended	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jan. 15, 2015	Dec. 31, 2013	Dec. 31, 2012
			Properties	Properties
Organization and Business [Abstract]
Common limited partnership interest in the Operating Partnership	94.10%
Toys R Us [Member]
Real Estate Properties [Line Items]
Equity method ownership percentage	32.60%
Alexanders Inc [Member]
Real Estate Properties [Line Items]
Equity method ownership percentage	32.40%
Retail Segment Strip Shopping Centers [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties	22
Number Of Real Estate Properties Sold	6
Subsequent Event [Member] | Toys R Us [Member]
Real Estate Properties [Line Items]
Equity method ownership percentage		32.60%
Subsequent Event [Member] | Vornado Realty Trust [Member]
Real Estate Properties [Line Items]
Number of shares/units convered during spin off for 1 share of UE		2
Subsequent Event [Member] | Urban Edge Properties [Member]
Real Estate Properties [Line Items]
Cash Considerations Transferred During Spin Off (in US Dollars)		225
Partnership Units received during spin off		5,712,000
Duration Of Administrative Services		2 years
Number of new shares issued during spin off for every 2 shares/units of Vornado and Vornado L.P.		1
Equity method ownership percentage		5.40%
Subsequent Event [Member] | Urban Edge Properties [Member] | Retail Segment Strip Shopping Centers [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		79
Subsequent Event [Member] | Urban Edge Properties [Member] | Retail Segment Regional Malls [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		3
Subsequent Event [Member] | Vornado Realty L.P. [Member]
Real Estate Properties [Line Items]
Number of shares/units convered during spin off for 1 share of UE		2
Real Estate Fund [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Equity method ownership percentage		25.00%
New York Segment [Member] | Subsequent Event [Member] | Alexanders Inc [Member]
Real Estate Properties [Line Items]
Equity method ownership percentage		32.40%
New York Segment [Member] | New York City Metropolitan Area [Member] | Subsequent Event [Member] | Alexanders Inc [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		6
New York Segment [Member] | New York City Metropolitan Area [Member] | Lexington Avenue 731 [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Square Footage Of Real Estate Property		1,300,000
Retail Properties Segment [Member] | Retail Segment Strip Shopping Centers [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties Sold			12	12
Warehouse [Member] | Subsequent Event [Member] | Urban Edge Properties [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		1
Office Building [Member] | San Francisco [Member] | Other Properties 555 California Street [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		3
Square Footage Of Real Estate Property		1,800,000
Contolling Interest In Real Estate Properties Percent		70.00%
Office Building [Member] | New York Segment [Member] | Manhattan [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		31
Square Footage Of Real Estate Property		20,100,000
Office Building [Member] | Washington DC Segment [Member] | Washington Dc Northern Virginia [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		59
Square Footage Of Real Estate Property		16,100,000
Retail Properties [Member] | New York Segment [Member] | Manhattan [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		56
Square Footage Of Real Estate Property		2,500,000
Merchandise Mart Properties [Member] | Merchandise Mart IL Chicago [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Square Footage Of Real Estate Property		3,600,000
Other Real Estate And Related Investments [Member] | New York Segment [Member] | Manhattan [Member] | Hotel Pennsylvania [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number of Units in Real Estate Property (in number of residential units)/ (in number of rooms)		1,700
Residential Properties [Member] | New York Segment [Member] | Manhattan [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		4
Number of Units in Real Estate Property (in number of residential units)/ (in number of rooms)		1,654
Residential Properties [Member] | Washington DC Segment [Member] | Washington Dc Northern Virginia [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Number Of Real Estate Properties		7
Number of Units in Real Estate Property (in number of residential units)/ (in number of rooms)		2,414

Basis_of_Presentation_and_Sign3

Basis of Presentation and Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	40 years
Interest Costs Capitalized	$62,786	$42,303
Maximum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	40 years
Minimum [Member]
Property Plant And Equipment [Line Items]
Property Plant And Equipment Useful Life	7 years

Basis_of_Presentation_and_Sign4

Basis of Presentation and Significant Accounting Policies (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Equity Method Investments [Line Items]
Acquisition and transaction related costs, and impairment losses	$33,391	$43,857	$25,786
Significant Policies Other Details [Abstract]
Tenant and other receivables, allowance for doubtful accounts (in US dollars)	17,060	21,869
Receivables Arising From Straight Lining Of Rents Allowance	3,188	4,355
Impairment Loss [Member]
Schedule Of Equity Method Investments [Line Items]
Acquisition and transaction related costs, and impairment losses	0	19,000	14,538
Acquisitions related costs [Member]
Schedule Of Equity Method Investments [Line Items]
Acquisition and transaction related costs, and impairment losses	33,391	24,857	11,248
Acquisitions related costs [Member] | New York 655 Fifth Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Penalty on early repayment of loan	10,949
Equity Method Investments [Member]
Schedule Of Equity Method Investments [Line Items]
Other than Temporary Impairment Losses Investments	85,459	281,098	44,936
Toys R Us [Member] | Impairment Loss [Member]
Schedule Of Equity Method Investments [Line Items]
Other than Temporary Impairment Losses Investments	$75,196	$240,757	$40,000

Basis_of_Presentation_and_Sign5

Basis of Presentation and Significant Accounting Policies (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Treatment Of Dividend [Line Items]
Minimum Percentage of Taxable Income Distributed As Dividends									90.00%
Deferred Tax Assets, Valuation Allowance	$94,100,000				$87,800,000				$94,100,000	$87,800,000
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Line Items]
Net income Attributable to Common Shareholders	513,238,000	131,159,000	76,642,000	62,349,000	-68,887,000	83,005,000	145,926,000	231,990,000	783,388,000	392,034,000	549,271,000
Depreciation and Amortization									219,403,000	155,401,000	205,155,000
Impairment losses on marketable equity securities									0	37,236,000	211,328,000
Straight-line rent adjustments									-77,526,000	-64,811,000	-64,679,000
Earnings of Partially Owned Entities									71,960,000	339,376,000	-60,049,000
Stock Options									-9,566,000	4,884,000	-28,701,000
Sale of Real Estate									-477,061,000	-324,936,000	-123,905,000
Derivatives									0	31,578,000	71,228,000
Other, net									1,260,000	4,608,000	17,080,000
Estimated Taxable Income (unaudited)									511,858,000	575,370,000	776,728,000
Income Tax Liability Relating to Taxable REIT Subsidiaries Current									10,777,000	9,608,000	20,336,000
Net Basis Difference Of Assets And Liabilities Between Tax Basis And GAAP Basis	$3,600,000,000								$3,600,000,000
Ordinary Income [Member]
Tax Treatment Of Dividend [Line Items]
Percentage Of Taxable Income Distributed									100.00%		62.70%
Long Term Capital Gain [Member]
Tax Treatment Of Dividend [Line Items]
Percentage Of Taxable Income Distributed											37.30%

Vornado_Capital_Partners_Real_2

Vornado Capital Partners Real Estate Fund (the "Fund") (Narratives) (Details) (USD $)	12 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Aug. 21, 2014	Jun. 26, 2014	Jan. 20, 2015
	Investments	Investments	sqft
Investment Holdings [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$513,973	$667,710
Mortgages payable (in US Dollars)	9,551,700	8,331,993
Unfunded Commitments Of Fund	36,031
Real Estate Fund [Member]
Investment Holdings [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)	513,973	667,710
Term of the Fund, years	8 years
Investment period for commitments of the Fund, years	3 years
Number Of Investments Held By Fund	7	9
Excess of fair value over cost	176,899
Unfunded Commitments Of Fund	144,123
Real Estate Fund [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Equity method ownership percentage					25.00%
Number Of Limited Partners					1
Retail Georgetown Park [Member] | Real Estate Fund [Member]
Investment Holdings [Line Items]
Net realized gain on sale of investment			51,124
Square Footage Of Real Estate Property			305,000
Proceeds from sale of real estate			272,500
Retail Georgetown Park [Member] | Real Estate Fund [Member] | Joint Venture [Member]
Investment Holdings [Line Items]
Equity method ownership percentage			50.00%
One Park Avenue [Member]
Investment Holdings [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)				560,000
One Park Avenue [Member] | Co Venture [Member]
Investment Holdings [Line Items]
Equity method ownership percentage				45.00%
One Park Avenue [Member] | Vornado Realty Trust Excluding Real Estate Fund [Member]
Investment Holdings [Line Items]
Equity method ownership percentage				55.00%
One Park Avenue [Member] | Real Estate Fund [Member]
Investment Holdings [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)				560,000
Net realized gain on sale of investment				75,529
One Park Avenue [Member] | Real Estate Fund [Member] | Joint Venture [Member]
Investment Holdings [Line Items]
Sale Of Investments Percentage				64.70%
Crowne Plaza Time Square Hotel [Member]
Investment Holdings [Line Items]
Equity method ownership percentage	11.00%
Crowne Plaza Time Square Hotel [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Equity method ownership percentage					33.00%
Crowne Plaza Time Square Hotel [Member] | Real Estate Fund [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Mortgages payable (in US Dollars)					310,000
Debt Instrument, Description of Variable Rate Basis					LIBOR
Spread Over LIBOR (in percentage)					2.80%
Debt Instrument Maturity					Dec-18
Length Of Extension Available					1 year
Crowne Plaza Time Square Hotel [Member] | Real Estate Fund Joint Venture [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Equity method ownership percentage					57.00%
Aggregate fair value of Real Estate Fund investments (in US Dollars)					480,000
Business Acquisition Cost Of Acquired Entity					95,000
Crowne Plaza Time Square Hotel [Member] | Vornado Realty Trust [Member] | Subsequent Event [Member]
Investment Holdings [Line Items]
Business Acquisition Cost Of Acquired Entity					$39,000

Vornado_Capital_Partners_Real_3

Vornado Capital Partners Real Estate Fund (the "Fund") (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Details Of Income From Real Estate Funds [Abstract]
Income from Real Estate Fund	$163,034	$102,898	$63,936
Less income attributable to noncontrolling interests	-96,561	-63,952	-32,018
Income From Real Estate Fund Attributable To Vornado	70,306	49,471	24,604
Fee And Other Income	195,745	250,618	144,124
Real Estate Fund [Member]
Details Of Income From Real Estate Funds [Abstract]
Less income attributable to noncontrolling interests	-92,728	-53,427	-39,332
Fee And Other Income	2,865	2,992	3,278
Net investment income [Member] | Real Estate Fund [Member]
Details Of Income From Real Estate Funds [Abstract]
Income from Real Estate Fund	12,895	8,943	8,575
Net realized gains [Member] | Real Estate Fund [Member]
Details Of Income From Real Estate Funds [Abstract]
Income from Real Estate Fund	76,337	8,184	0
Net unrealized gains [Member] | Real Estate Fund [Member]
Details Of Income From Real Estate Funds [Abstract]
Income from Real Estate Fund	$73,802	$85,771	$55,361

Acquisitions_Narratives_Detail

Acquisitions (Narratives) (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Aug. 01, 2014	Oct. 28, 2014	Nov. 21, 2014	Dec. 31, 2014	Dec. 31, 2013	Jan. 20, 2015
			Story			LimitedPartners
			sqft
Business Acquisition [Line Items]
Mortgages payable				$9,551,700	$8,331,993
Subsequent Event [Member] | Real Estate Fund [Member]
Business Acquisition [Line Items]
Equity method ownership percentage						25.00%
Number Of Limited Partners						1
Lexington Avenue 715 Retail [Member] | New York Segment [Member]
Business Acquisition [Line Items]
Business Acquisition Cost Of Acquired Entity	63,000
St Regis Hotel [Member] | Retail Properties [Member]
Business Acquisition [Line Items]
Business Acquisition Cost Of Acquired Entity		700,000
St Regis Hotel [Member] | Retail Properties [Member] | Joint Venture [Member]
Business Acquisition [Line Items]
Equity method ownership percentage		74.30%
Center Building [Member] | New York Segment [Member] | Office Building [Member]
Business Acquisition [Line Items]
Business Acquisition Cost Of Acquired Entity			142,000
Square Footage Of Real Estate Property			437,000
Number Of Story In Office Tower			8
Lease Percentage Of Property			98.00%
Mortgages payable			62,000
Interest Rate, End of Period (in percentage)			4.43%
Debt Instrument Maturity			Oct-18
Non Refundable Deposit			$14,200
Crowne Plaza Time Square Hotel [Member] | Subsequent Event [Member] | Real Estate Fund [Member]
Business Acquisition [Line Items]
Number Of Limited Partners						1
Crowne Plaza Time Square Hotel [Member] | New York Segment [Member] | Joint Venture [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Equity method ownership percentage						57.00%

Marketable_Securities_and_Deri2

Marketable Securities and Derivative Instruments: Derivative Instruments (Narratives) (Details) (USD $)	12 Months Ended			0 Months Ended	3 Months Ended	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 19, 2013	Mar. 31, 2013	Sep. 30, 2013
Derivative [Line Items]
Proceeds from sales of, and return of investment in, marketable securities	$0	$378,709	$60,258
JC Penney [Member]
Summary Of Derivative Instruments [Abstract]
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net Availableforsale Securities					39,487
Derivative [Line Items]
Closing share price (in dollars per share)					$15.11	$14.29
Impairment loss					39,487
Loss from the mark-to-market of J.C. Penney derivative position				33,487
Net loss on sale of common shares in J.C Penney						54,914
Sale of Stock, Number of Shares						23,400,000
Proceeds from sales of, and return of investment in, marketable securities						334,500
Lexington Realty Trust [Member] | Maximum [Member]
Derivative [Line Items]
Ownership Percentage					17.20%
Lexington Realty Trust [Member] | Minimum [Member]
Derivative [Line Items]
Ownership Percentage					8.80%
Other Investments [Member]
Derivative [Line Items]
Marketable Securities Gain (Loss)		31,741	3,582
Proceeds from sales of, and return of investment in, marketable securities		$44,209	$58,718
Shares Owned [Member] | JC Penney [Member]
Derivative [Line Items]
Ownership common shares, investee (in shares)					8,584,010
Common Shares [Member] | JC Penney [Member]
Derivative [Line Items]
Receipt of common shares by settling forward contract				4,815,990

Marketable_Securities_and_Deri3

Marketable Securities and Derivative Instruments: Marketable Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities	$206,323	$191,917
Available-for-sale Equity Securities, Amortized Cost Basis	72,549	72,608
Available-for-sale Securities, Gross Unrealized Gain (Loss)	133,774	119,309
Lexington Realty Trust [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities	202,789	188,567
Available-for-sale Equity Securities, Amortized Cost Basis	72,549	72,549
Available-for-sale Securities, Gross Unrealized Gain (Loss)	130,240	116,018
Other Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities	3,534	3,350
Available-for-sale Equity Securities, Amortized Cost Basis	0	59
Available-for-sale Securities, Gross Unrealized Gain (Loss)	$3,534	$3,291

Investments_in_Partially_Owned2

Investments in Partially Owned Entities (Details) (USD $)	12 Months Ended			3 Months Ended	12 Months Ended			3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Nov. 01, 2014	Nov. 02, 2013	Oct. 27, 2012	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	$1,246,496	$1,249,667	$1,704,297						$1,249,667
Comprehensive Income Net of Tax	886,582	566,454	524,585
Income (Loss) From Equity Method Investments	-58,131	-338,785	423,126
Non-cash impairment losses	0	72,974	300,752
Impairment Losses	26,518	37,170	133,977
Condensed Financial Information For Equity Method Investments [Abstract]
Assets	21,389,000	21,773,000							21,773,000
Liabilities	17,986,000	17,982,000							17,982,000
Noncontrolling interests	104,000	96,000							96,000
Equity	3,299,000	3,695,000							3,695,000
Total revenue	13,620,000	14,092,000	15,119,000
Net income (loss) income attributable to investee	-434,000	-368,000	1,091,000
Equity Method Investment Summarized Financial Information Gain Loss On Sale Of Real Estate Assets			600,000
Toys R Us [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	32.60%
Equity in net income				78,542
Fair value of invesements in Toys R Us		80,062							80,062
Carrying amount of investments in partially owned entities	0	83,224							83,224
Comprehensive Income Net of Tax		3,162
Excess of investee's carrying amount over equity in net assets		162,215							162,215
Income (Loss) From Equity Method Investments	-73,556	-362,377	14,859
Non-cash impairment losses	355,953
Condensed Financial Information For Equity Method Investments [Abstract]
Assets					11,267,000	11,756,000
Liabilities					10,377,000	10,437,000
Noncontrolling interests					82,000	75,000
Equity					808,000	1,244,000
Total revenue					12,645,000	13,046,000	13,698,000
Net income (loss) income attributable to investee					-343,000	-396,000	138,000
Equity Method Investment, Difference Excess Of Underlying Equity Over Carrying Amount	263,455
Toys R Us [Member] | Equity In Net Income After Income Taxes [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	-4,691	-128,919	45,267					75,196
Toys R Us [Member] | Management Fees [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	6,331	7,299	9,592
Toys R Us [Member] | Impairment Loss [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Other than Temporary Impairment Losses Investments									162,215
Income (Loss) From Equity Method Investments	-75,196	-240,757	-40,000
Alexanders Inc [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	32.40%
Carrying amount of investments in partially owned entities	131,616	167,785							167,785
Excess of investee's carrying amount over equity in net assets	42,048
Income (Loss) From Equity Method Investments	30,009	24,402	218,391
Condensed Financial Information For Equity Method Investments [Abstract]
Assets	1,423,000	1,458,000							1,458,000
Liabilities	1,075,000	1,124,000							1,124,000
Equity	348,000	334,000							334,000
Total revenue	201,000	196,000	191,000
Net income (loss) income attributable to investee	68,000	57,000	674,000
Equity Method Investment Summarized Financial Information Gain Loss On Sale Of Real Estate Assets			600,000
Alexanders Inc [Member] | Equity In Net Income After Income Taxes [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	21,287	17,721	24,709
Alexanders Inc [Member] | Management Leasing And Development Fees [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	8,722	6,681	13,748
Alexanders Inc [Member] | Net Gain On Sale Of Real Estate [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	0	179,934
India real estate ventures [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	76,752	88,467							88,467
Income (Loss) From Equity Method Investments	-8,309	-3,533	-5,008
Non-cash impairment losses	5,771
India real estate ventures [Member] | Minimum [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	4.10%
India real estate ventures [Member] | Maximum [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	36.50%
India real estate ventures [Member] | Tcg Urban Infrastructure Holdings [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage	25.00%
Partially owned office buildings [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	760,749	621,294							621,294
Income (Loss) From Equity Method Investments	93	-4,212	-3,770
Other equity method investments [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	277,379	288,897							288,897
Income (Loss) From Equity Method Investments	-6,368	-10,817	103,644
Other equity method investments [Member] | Suffolk Downs [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Non-cash impairment losses										10,263
Impairment Losses										5,959
Asset Impairment Loan Loss Reserve										4,304
Lexington Realty Trust [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	-979	28,740
Lexington Realty Trust [Member] | Net Gain From Stock Issuance And Asset Acquisition [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	0	28,763
Lexington Realty Trust [Member] | Impairment Loss [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	-979	-23
LNR [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Other than Temporary Impairment Losses Investments				27,231
Income (Loss) From Equity Method Investments	0	18,731	66,270
LNR [Member] | Net gain on sale [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	3,776	0
LNR [Member] | Equity In Net Income After Income Taxes [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	42,186	66,270
LNR [Member] | Impairment Loss [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Income (Loss) From Equity Method Investments	0	-27,231	0
All Equity Method Investees Excluding Toys [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Carrying amount of investments in partially owned entities	1,246,496	1,166,443							1,166,443
Income (Loss) From Equity Method Investments	$15,425	$23,592	$408,267

Investments_in_Partially_Owned3

Investments in Partially Owned Entities (Alexander's Inc.) (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 22, 2014	Jan. 15, 2015
Leasing Agreement [Abstract]
Fee And Other Income	$195,745,000	$250,618,000	$144,124,000
Condensed Financial Information For Equity Method Investments [Abstract]
Assets	21,389,000,000	21,773,000,000
Liabilities	17,986,000,000	17,982,000,000
Noncontrolling interests	104,000,000	96,000,000
Equity	3,299,000,000	3,695,000,000
Total revenue	13,620,000,000	14,092,000,000	15,119,000,000
Net income (loss) income attributable to investee	-434,000,000	-368,000,000	1,091,000,000
Equity Method Investment Summarized Financial Information Gain Loss On Sale Of Real Estate Assets			600,000,000
Retail Segment Strip Shopping Centers [Member]
Managment And Development Agreement [Abstract]
Number Of Real Estate Properties	22
Subsequent Event [Member] | Urban Edge Properties [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Equity method ownership percentage					5.40%
Managment And Development Agreement [Abstract]
Cash Considerations Transferred During Spin Off					225,000,000
Subsequent Event [Member] | Urban Edge Properties [Member] | Retail Segment Strip Shopping Centers [Member]
Managment And Development Agreement [Abstract]
Number Of Real Estate Properties					79
Subsequent Event [Member] | Urban Edge Properties [Member] | Retail Segment Regional Malls [Member]
Managment And Development Agreement [Abstract]
Number Of Real Estate Properties					3
Subsequent Event [Member] | Urban Edge Properties [Member] | Warehouse [Member]
Managment And Development Agreement [Abstract]
Number Of Real Estate Properties					1
Alexanders Inc [Member]
Equity Method Investments And Income From Equity Method Investments [Abstract]
Ownership common shares, investee (in shares)	1,654,068
Equity method ownership percentage	32.40%
Closing share price (in dollars per share)	$437.18
Equity Method Investment Market Value	723,125,000
Excess of investee's fair value over carrying amount	591,509,000
Excess of investee's carrying amount over equity in net assets	42,048,000
Managment And Development Agreement [Abstract]
Property Management Fee Description	equal to the sum of (i) $2,800,000, (ii) 2% of the gross revenue from the Rego Park II Shopping Center, (iii) $0.50 per square foot of the tenant-occupied office and retail space at 731 Lexington Avenue, and (iv) $280,000, escalating at 3% per annum, for managing the common area of 731 Lexington Avenue.
Management and Development fee income	2,800,000
Development Fee Percent	6.00%
Leasing Agreement [Abstract]
Leasing Services Fee Description	leasing services for a fee of 3% of rent for the first ten years of a lease term, 2% of rent for the eleventh through twentieth year of a lease term and 1% of rent for the twenty-first through thirtieth year of a lease term, subject to the payment of rents by Alexander’s tenants. In the event third-party real estate brokers are used, our fee increases by 1% and we are responsible for the fees to the third-parties.
Lease Fee Percentage Of Rent One To Ten Years	3.00%
Lease Fee Percentage Of Rent Eleven To Twenty Years	2.00%
Lease Fee Percentage Of Rent Twenty First To Thirty Years	1.00%
Percentage Increase Lease Fee If Broker Used	1.00%
Asset Sale Commission Threshold	50,000,000
Percentage Commissions On Sale Of Assets Under Fifty Million	3.00%
Percentage Commissions On Sale Of Assets Over Fifty Million	1.00%
Leasing Services Fee And Commission On Asset Sales Annual Installment Maximum				4,000,000
Debt Instrument, Description of Variable Rate Basis	one-year LIBOR
Spread Over LIBOR (in percentage)	1.00%
Unpaid Balance Year End Interest Rate	1.58%
Repayment of Alexander's Inc. leasing commissions				40,353,000
Other Agreements [Abstract]
Fee Income recognized by equity method investees for building maintenance services	2,318,000	2,036,000	2,362,000
Other Financial Data For Equity Method Investments [Abstract]
Commission On Asset Sales Description	commission upon the sale of any of Alexander’s assets equal to 3% of gross proceeds, as defined, for asset sales less than $50,000,000, and 1% of gross proceeds, as defined, for asset sales of $50,000,000 or more.
Other Services Fee Description	Building Maintenance Services (“BMS”), our wholly-owned subsidiary, supervises (i) cleaning, engineering and security services at Alexander’s 731 Lexington Avenue property and (ii) security services at Alexander’s Rego Park I and Rego Park II properties, for an annual fee of the costs for such services plus 6%.
Condensed Financial Information For Equity Method Investments [Abstract]
Assets	1,423,000,000	1,458,000,000
Liabilities	1,075,000,000	1,124,000,000
Equity	348,000,000	334,000,000
Total revenue	201,000,000	196,000,000	191,000,000
Net income (loss) income attributable to investee	68,000,000	57,000,000	674,000,000
Equity Method Investment Summarized Financial Information Gain Loss On Sale Of Real Estate Assets			600,000,000
Alexanders Inc [Member] | Rego Park 2 Property [Member]
Managment And Development Agreement [Abstract]
Property Management Fee Agreement Percentage Of Income	2.00%
Alexanders Inc [Member] | Lexington Avenue 731 [Member]
Managment And Development Agreement [Abstract]
Property Management Fee Agreement Price Per Square Foot	0.5
Alexanders Inc [Member] | Common Area 731 Lexington Avenue [Member]
Managment And Development Agreement [Abstract]
Management and Development fee income	$280,000
Property Management Fee Agreement Percentage Of Income	3.00%
Other Agreements [Abstract]
Other Supervisory Fees Percent	6.00%

Investments_in_Partially_Owned4

Investments in Partially Owned Entities (LNR) (Details) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2013	Mar. 31, 2013
Schedule Of Equity Method Investments [Line Items]
Proceeds from the sale of LNR	$0	$240,474,000	$0
LNR [Member]
Schedule Of Equity Method Investments [Line Items]
Sales Of Real Estate				1,053,000,000
Impairment loss					27,231,000
LNR [Member] | Vornado Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Proceeds from the sale of LNR				$240,474,000

Investments_in_Partially_Owned5

Investments in Partially Owned Entities (One Park Avenue and 61 Ninth Avenue) (Details) (USD $)	12 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 26, 2014	Jul. 23, 2014	Dec. 31, 2013
			sqft
Schedule Of Equity Method Investments [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$513,973			$667,710
Notes And Loans Payable	9,551,700			8,331,993
Lease expiration term	30 years
One Park Avenue [Member]
Schedule Of Equity Method Investments [Line Items]
Aggregate fair value of Real Estate Fund investments (in US Dollars)		560,000
Maturity, Range, End		Mar-16
One Park Avenue [Member] | Mortgage loan at 4.995% Matures 2016 [Member]
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable		250,000
Interest Rate, End of Period (in percentage)		5.00%
One Park Avenue [Member] | Vornado Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Ownership Additional Investment		22,700
Equity method ownership percentage		55.00%		46.50%
One Park Avenue [Member] | Co Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage		45.00%
Sixty One Ninth Avenue Property [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage			50.10%
Lease expiration term			99 years
Square Footage Of Real Estate Property			130,000
Estimated Development Cost			$125,000

Investments_in_Partially_Owned6

Investments in Partially Owned Entities - Debt (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Equity Method Investments [Line Items]
Equity Method Investment Pro Rata Share Debt Of Partially Owned Entities	$4,273,632	$4,189,403
Toys R Us [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	32.60%
Maturity, Range, Start	2015
Maturity, Range, End	2021
Interest Rate, End of Period (in percentage)	7.23%
Equity Method Investment Debt Of Partially Owned Entities	5,748,350	5,702,247
Alexanders Inc [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	32.40%
Maturity, Range, Start	2015
Maturity, Range, End	2021
Interest Rate, End of Period (in percentage)	2.59%
Equity Method Investment Debt Of Partially Owned Entities	1,032,780	1,049,959
Partially owned office buildings [Member]
Schedule Of Equity Method Investments [Line Items]
Maturity, Range, Start	2015
Maturity, Range, End	2023
Interest Rate, End of Period (in percentage)	5.59%
Equity Method Investment Debt Of Partially Owned Entities	3,691,274	3,622,759
India real estate ventures [Member] | Minimum [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	4.10%
India real estate ventures [Member] | Maximum [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	36.50%
India real estate ventures [Member] | Tcg Urban Infrastructure Holdings [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	25.00%
Maturity, Range, Start	2015
Maturity, Range, End	2026
Interest Rate, End of Period (in percentage)	13.25%
Equity Method Investment Debt Of Partially Owned Entities	183,541	199,021
Other equity method investments [Member]
Schedule Of Equity Method Investments [Line Items]
Maturity, Range, Start	2015
Maturity, Range, End	2023
Interest Rate, End of Period (in percentage)	4.33%
Equity Method Investment Debt Of Partially Owned Entities	$1,480,485	$1,709,509

Mortgage_and_Mezzanine_Loans_R1

Mortgage and Mezzanine Loans Receivable (Narratives) (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 14, 2014	Mar. 31, 2013	Oct. 31, 2012	Apr. 17, 2013	31-May-14	Mar. 31, 2014
						Story
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other liabilities	$384,676,000	$436,360,000
Elimination of a mortgage and mezzanine loan asset and liability	59,375,000	0	0
Interest And Other investment (Loss) Income Net	38,787,000	-24,876,000	-261,179,000
Mortgage and mezzanine loans receivable	16,748,000	170,972,000
Mortgage and mezzanine loans receivable, allowance (in US dollars)	5,811,000	5,845,000
Mezzanine Loan Receivable - Interest Rate	9.10%	11.00%
Mezzanine Loans Receiveable - Maturity Start Date	Apr-15
Mezzanine Loans Receiveable - Maturity End Date	May-16
NY 701 Seventh Avenue [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mezzanine Loan Ownership Percentage						25.00%
Mortgage and mezzanine loan for the acquisition and redevelopment						475,000,000
Number Of Story In Office Tower						10
Loans Receivable Description Of Variable Rate Basis						LIBOR
Loans Receivable, Basis Spread on Variable Rate						10.20%
LIBOR Floor (in percentage)						1.00%
Mezzanine Loans Receivable - Carrying Amount						375,000,000
Percentage Of Participation In Mortgage Interest Sold					25.00%
Other liabilities		59,375,000
Elimination of a mortgage and mezzanine loan asset and liability				59,375,000
NY 701 Seventh Avenue [Member] | Vornado Realty Trust [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mezzanine Loans Receivable - Carrying Amount						93,750,000
Other Mezzanine Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Prepayment Of Mezzanine Loan Receivable							50,091,000	25,000,000	30,000,000
Mezzanine Loan Receivable - Maturity Date							Aug-15	Nov-14	Jan-15
Proceeds From Collection Of Notes Receivable Including Prepayment Penalty							55,358,000
Interest And Other investment (Loss) Income Net							$5,267,000

Dispositions_Narratives_Detail

Dispositions (Narratives) (Details) (USD $)

12 Months Ended

0 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Feb. 24, 2014

Jul. 08, 2014

Mar. 02, 2014

Jan. 24, 2013

Apr. 15, 2013

Sep. 23, 2013

Nov. 07, 2012

Jul. 26, 2012

Jan. 06, 2012

Jun. 22, 2012

Dec. 31, 2012

Dec. 18, 2014

Dec. 17, 2013

sqft

sqft

Properties

sqft

sqft

sqft

sqft

sqft

sqft

sqft

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Net gains on sale of real estate

$507,192,000

$414,502,000

$245,799,000

Gain on sale of Canadian Trade Shows

0

0

31,105,000

Impairment Losses

26,518,000

37,170,000

133,977,000

Seller Financing Related To Property Sales

0

0

35,000,000

Retail Segment Strip Shopping Centers [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

66,410,000

Net gains on sale of real estate

22,500,000

Number Of Real Estate Properties Sold

6

Number Of Real Estate Properties

22

Canadian Trade Shows [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gain on sale of Canadian Trade Shows

0

0

19,657,000

Income tax on gain on sale

11,448,000

Retail Properties Segment [Member] | Retail Segment Strip Shopping Centers [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Sale price of real estate

82,300,000

157,000,000

Net gains on sale of real estate

7,851,000

22,266,000

Number Of Real Estate Properties Sold

12

12

Retail Properties Segment [Member] | Retail NY Hicksville (Broadway Mall) [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

94,000,000

Net proceeds from the sale of real estate

92,174,000

Retail Properties Segment [Member] | Retail CA Los Angeles Beverly Connection [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

260,000,000

Square Footage Of Real Estate Property Sold

335,000

Sale price of real estate

239,000,000

Mortgage loan receivable

21,000,000

Mortgage loan receivable maturity tenure

10 years

Net gains on sale of real estate

44,155,000

Retail Properties Segment [Member] | Retail Springfield Mall [Member] | Pennsylevenia Real Estate Investment Trust [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

465,000,000

Square Footage Of Real Estate Property Sold

1,350,000

Sale price of real estate

340,000,000

Operating Partnership Units Value Received From Buyer

125,000,000

Impairment Losses

20,000,000

Retail Properties Segment [Member] | Green Acres Mall [Member] | Retail Segment Regional Malls [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

500,000,000

Net proceeds from the sale of real estate

185,000,000

Net gains on sale of real estate

202,275,000

Retail Properties Segment [Member] | Plant [Member] | Retail Segment Strip Shopping Centers [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

203,000,000

Net proceeds from the sale of real estate

98,000,000

Net gains on sale of real estate

32,169,000

Retail Properties Segment [Member] | Gallery At Market Street [Member] | Retail Segment Strip Shopping Centers [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

60,000,000

Net proceeds from the sale of real estate

58,000,000

Net gains on sale of real estate

33,058,000

Retail Properties Segment [Member] | Tampa Florida [Member] | Retail Segment Strip Shopping Centers [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

45,000,000

Retail Properties Segment [Member] | Tampa Florida [Member] | Retail Segment Strip Shopping Centers [Member] | Vornado Realty Trust [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

33,750,000

Net proceeds from the sale of real estate

20,810,000

Net gains on sale of real estate

8,728,000

Sale Of Ownership Interest Percent

75.00%

Washington DC Segment [Member] | Reston Executive [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

126,250,000

Square Footage Of Real Estate Property Sold

494,000

Net gains on sale of real estate

36,746,000

Number Of Real Estate Properties Sold

3

Washington DC Segment [Member] | 409 Third Street SW [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Square Footage Of Real Estate Property Sold

409,000

Sale price of real estate

200,000,000

Net gains on sale of real estate

126,621,000

Merchandise Mart Segment [Member] | West Mart Center 350 [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Square Footage Of Real Estate Property Sold

1,200,000

Sale price of real estate

228,000,000

Net gains on sale of real estate

54,911,000

Merchandise Mart Segment [Member] | LA Mart [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

53,000,000

Square Footage Of Real Estate Property Sold

784,000

Sale price of real estate

18,000,000

Duration Of Seller Financing Rate

9 months

Seller financing rate

6.00%

Seller Financing Related To Property Sales

35,000,000

Merchandise Mart Segment [Member] | Washington Design Center and Canadian Trade Shows [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Sale price of real estate

103,000,000

Merchandise Mart Segment [Member] | Washington Design Center [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Square Footage Of Real Estate Property Sold

393,000

Merchandise Mart Segment [Member] | Canadian Trade Shows [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gain on sale of Canadian Trade Shows

19,657,000

Merchandise Mart Segment [Member] | Boston Design Center [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Square Footage Of Real Estate Property Sold

554,000

554,000

Sale price of real estate

72,400,000

Net gains on sale of real estate

5,252,000

New York Segment [Member] | New York Office 1740 Broadway [Member] | Office Building [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

605,000,000

Net proceeds from the sale of real estate

580,000,000

Square Footage Of Real Estate Property Sold

601,000

Net gains on sale of real estate

441,000,000

Income tax on gain on sale

484,000,000

New York Segment [Member] | New York Office 866 UN Plaza [Member]

Disposal Group Including Discontinued Operation Additional Disclosures [Abstract]

Gross proceeds from the sale of real estate

200,000,000

Net proceeds from the sale of real estate

146,439,000

Square Footage Of Real Estate Property Sold

360,000

Net gains on sale of real estate

$127,512,000

Dispositions_Details_1

Dispositions (Details 1) (USD $)	12 Months Ended			0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 26, 2012
Disposal Group Including Discontinued Operation Unclassified Balance Sheet Disclosures Abstract
Assets related to discontinued operations	$477,620	$874,050
Liabilities related to discontinued operations	211	14,709
Discontinued Operation, Income (Loss) from Discontinued Operations Disclosure [Abstract]
Total revenues	70,593	129,860	264,878
Total expenses	36,424	79,458	190,450
Income from discontinued operations before gain on sale of real estate	34,169	50,402	74,428
Net gains on sale of real estate	507,192	414,502	245,799
Impairment losses	-26,518	-18,170	-119,439
Gain on sale of Canadian Trade Shows, net of 11,448 of income taxes	0	0	31,105
Income (Loss) from Discontinued Operations	514,843	446,734	220,445
Canadian Trade Shows [Member]
Discontinued Operation, Income (Loss) from Discontinued Operations Disclosure [Abstract]
Gain on sale of Canadian Trade Shows, net of 11,448 of income taxes	0	0	19,657
Retail Properties Segment [Member]
Disposal Group Including Discontinued Operation Unclassified Balance Sheet Disclosures Abstract
Assets related to discontinued operations	477,620	735,888
Liabilities related to discontinued operations	211	14,709
New York Segment [Member]
Disposal Group Including Discontinued Operation Unclassified Balance Sheet Disclosures Abstract
Assets related to discontinued operations	0	138,162
Liabilities related to discontinued operations	0	0
Other Segment [Member]
Discontinued Operation, Income (Loss) from Discontinued Operations Disclosure [Abstract]
Income (Loss) from Discontinued Operations	807	-647	74,947
Merchandise Mart Segment [Member] | Canadian Trade Shows [Member]
Discontinued Operation, Income (Loss) from Discontinued Operations Disclosure [Abstract]
Gain on sale of Canadian Trade Shows, net of 11,448 of income taxes				$19,657

Identified_Intangible_Assets_a2

Identified Intangible Assets and Intangible Liabilities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross amount	$502,080	$583,862
Accumulated amortization	-225,841	-276,426
Net	276,239	307,436
Gross amount	885,763	855,860
Accumulated amortization	-396,895	-359,371
Net	488,868	496,489
Below Market Leases Net Of Above Market Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	46,277	50,128	51,271
2015	57,202
2016	45,333
2017	42,457
2018	41,311
2019	30,950
Other Identified Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	29,870	64,196	49,442
2015	27,210
2016	21,437
2017	17,859
2018	13,533
2019	11,553
Tenant Under Ground Leases [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	3,363	4,290	1,261
2015	3,363
2016	3,363
2017	3,363
2018	3,363
2019	$3,363

Debt_Narratives_Details

Debt (Narratives) (Details) (USD $)

12 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jun. 16, 2014

Jan. 31, 2014

Apr. 16, 2014

Jul. 16, 2014

Dec. 08, 2014

Jan. 06, 2015

Jan. 15, 2015

Aug. 12, 2014

Oct. 27, 2014

Aug. 26, 2014

Oct. 31, 2014

Dec. 31, 2014

Jan. 31, 2015

Sep. 30, 2014

sqft

sqft

Tranches

Properties

Extensions

Extensions

Extensions

sqft

CreditFacilities

sqft

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

$9,551,700,000

$8,331,993,000

$9,551,700,000

Proceeds from borrowings

2,428,285,000

2,262,245,000

3,593,000,000

Senior Unsecured Notes Due 2019 [Member]

Debt Instrument [Line Items]

Debt Instrument Maturity

30-Jun-19

Interest Rate, End of Period (in percentage)

2.58%

Public Offering Of Notes Payable (in US Dollars)

450,000,000

Public Offering, Interest Rate

2.50%

Debt Instrument Issuance Price Percentage

99.62%

New York Manhattan 220 Central Park South Site [Member]

Debt Instrument [Line Items]

Debt Instrument, Description of Variable Rate Basis

LIBOR

New York Two Penn Plaza [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

153,000,000

Notes And Mortgages Payable Fixed Rate [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

7,710,931,000

7,563,133,000

7,710,931,000

Interest Rate, End of Period (in percentage)

4.45%

4.45%

Notes And Mortgages Payable Fixed Rate [Member] | New York 909 Third Avenue [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

193,000,000

Debt Instrument Maturity

May-21

Notes And Loans Payable Refinanced Amount (in US Dollars)

350,000,000

Square Footage Of Real Estate Property

1,300,000

Debt Term

7 years

Interest Rate, End of Period (in percentage)

5.64%

3.91%

Proceeds from borrowings

145,000,000

Notes And Mortgages Payable Fixed Rate [Member] | Las Catalinas Mall [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

130,000,000

Debt Instrument Maturity

Aug-24

Square Footage Of Real Estate Property

494,000

Debt Term

10 years

Interest Rate, End of Period (in percentage)

4.43%

Debt Instrument Amortization Period

30 years

Debt Maturity Beginning Period

6 years

Notes And Mortgages Payable Fixed Rate [Member] | New York Two Penn Plaza [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

422,000,000

Debt Instrument Maturity

Mar-18

Interest Rate, End of Period (in percentage)

4.78%

Notes And Mortgages Payable Fixed Rate [Member] | New York Two Penn Plaza [Member] | Swap [Member]

Debt Instrument [Line Items]

Debt Instrument Maturity

Mar-18

Interest Rate, End of Period (in percentage)

4.78%

Notes And Mortgages Payable Fixed Rate [Member] | Retail Montehiedra Town Center [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

120,000,000

Interest Rate, End of Period (in percentage)

6.04%

Number Of Loan Tranches

2

Debt Instrument Maturity Date Original

Jul-16

Debt Instrument Maturity Date New

Jul-21

Notes And Mortgages Payable Fixed Rate [Member] | Retail Montehiedra Town Center [Member] | Subsequent Event [Member] | Urban Edge Properties [Member]

Debt Instrument [Line Items]

Interest Rate, End of Period (in percentage)

10.00%

Unfunded Commitments to the Real Estate Fund

20,000,000

Commitment Funded During Period

8,000,000

Notes And Mortgages Payable Fixed Rate Senior Position [Member] | Retail Montehiedra Town Center [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Interest Rate, End of Period (in percentage)

5.33%

Principal amount of mortgage loans

90,000,000

Notes And Mortgages Payable Fixed Rate Junior Position [Member] | Retail Montehiedra Town Center [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Interest Rate, End of Period (in percentage)

3.00%

Principal amount of mortgage loans

30,000,000

Notes And Mortgages Payable Variable Rate [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

1,840,769,000

768,860,000

1,840,769,000

Interest Rate, End of Period (in percentage)

2.20%

2.20%

Notes And Mortgages Payable Variable Rate [Member] | New York Manhattan 220 Central Park South Site [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

600,000,000

Spread Over LIBOR (in percentage)

2.75%

Debt Instrument Maturity

Jan-16

Number Of Extensions Available

3

Length Of Extension Available

1 year

Interest Rate, End of Period (in percentage)

2.92%

2.92%

Notes And Mortgages Payable Variable Rate [Member] | Washington DC Universal Buildings [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

185,000,000

Debt Instrument, Description of Variable Rate Basis

LIBOR

Spread Over LIBOR (in percentage)

1.90%

Debt Instrument Maturity

Aug-19

Number Of Extensions Available

2

Length Of Extension Available

1 year

Square Footage Of Real Estate Property

690,000

Interest Rate, End of Period (in percentage)

2.06%

2.06%

Debt Instrument Amortization Period

30 years

Debt Maturity Beginning Period

4 years

Number Of Office Buildings

2

Notes And Mortgages Payable Variable Rate [Member] | New York 655 Fifth Avenue [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

140,000,000

Debt Instrument, Description of Variable Rate Basis

LIBOR

Spread Over LIBOR (in percentage)

1.40%

Debt Instrument Maturity

Oct-19

Number Of Extensions Available

2

Length Of Extension Available

1 year

Square Footage Of Real Estate Property

57,500

Interest Rate, End of Period (in percentage)

1.56%

1.56%

Notes And Mortgages Payable Variable Rate [Member] | New York Two Penn Plaza [Member]

Debt Instrument [Line Items]

Debt Instrument, Description of Variable Rate Basis

LIBOR

Spread Over LIBOR (in percentage)

1.65%

Debt Instrument Maturity

2019

Number Of Extensions Available

2

Length Of Extension Available

1 year

Notes And Loans Payable Refinanced Amount (in US Dollars)

575,000,000

Square Footage Of Real Estate Property

1,600,000

Interest Rate, End of Period (in percentage)

1.81%

1.81%

Proceeds from borrowings

143,000,000

Notes And Mortgages Payable Variable Rate [Member] | New York Two Penn Plaza [Member] | Swap [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

422,000,000

Total Notes And Mortgages Payable [Member]

Debt Instrument [Line Items]

Mortgages payable (in US Dollars)

9,551,700,000

8,331,993,000

9,551,700,000

Interest Rate, End of Period (in percentage)

4.02%

4.02%

Standby Commitment [Member] | New York Manhattan 220 Central Park South Site [Member]

Debt Instrument [Line Items]

Debt Term

5 years

Mezzanine loan financing (in US Dollars)

500,000,000

Senior Unsecured Notes [Member]

Debt Instrument [Line Items]

Interest Rate, End of Period (in percentage)

3.89%

3.89%

Senior Unsecured Notes 7.875% [Member]

Debt Instrument [Line Items]

Debt Instrument Maturity

1-Oct-39

Interest Rate, End of Period (in percentage)

7.88%

Redemption of senior unsecured notes

445,000,000

Redemption Price, Percentage of Principal Amount Redeemed

100.00%

Unamortized deferred financing costs, write off

12,532,000

Senior Unsecured Notes 4.25% [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Debt Instrument Maturity

1-Apr-15

Interest Rate, End of Period (in percentage)

4.25%

Redemption of senior unsecured notes

500,000,000

Redemption Price, Percentage of Principal Amount Redeemed

100.00%

Unsecured Revolving Credit Facilities [Member]

Debt Instrument [Line Items]

Debt Instrument, Description of Variable Rate Basis

LIBOR

Spread Over LIBOR (in percentage)

1.05%

1.25%

Number Of Extensions Available

2

Length Of Extension Available

6 months

Interest Rate, End of Period (in percentage)

Number Of Revolving Credit Facilities

2

Extension Executed On Number Of Revolving Credit Facility

1

Line of Credit Facility, Maximum Borrowing Capacity

$1,250,000,000

Debt Instrument Maturity Date Original

Nov-15

Debt Instrument Maturity Date New

Nov-18

Facility Fee (in percentage)

0.20%

0.25%

Debt_Summary_of_Debt_Details

Debt (Summary of Debt) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	$9,551,700,000	$8,331,993,000
Senior unsecured notes	1,347,159,000	1,350,855,000
Revolving credit facility debt	0	295,870,000
Debt Fiscal Year Maturity [Abstract]
Collateral Property Net Carrying Value	10,400,000,000
Unsecured Debt [Member]
Debt Fiscal Year Maturity [Abstract]
2015	500,000,000
2016	0
2017	0
2018	0
2019	450,000,000
Thereafter	400,000,000
Notes And Mortgages Payable Fixed Rate [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	7,710,931,000	7,563,133,000
Interest Rate, End of Period (in percentage)	4.45%
Notes And Mortgages Payable Variable Rate [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	1,840,769,000	768,860,000
Interest Rate, End of Period (in percentage)	2.20%
Total Notes And Mortgages Payable [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	9,551,700,000	8,331,993,000
Interest Rate, End of Period (in percentage)	4.02%
Debt Fiscal Year Maturity [Abstract]
2015	433,699,000
2016	1,552,419,000
2017	626,525,000
2018	340,442,000
2019	996,579,000
Thereafter	5,601,148,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes	1,347,159,000	1,350,855,000
Interest Rate, End of Period (in percentage)	3.89%
Unsecured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Revolving credit facility debt	0	295,870,000
Interest Rate, End of Period (in percentage)
Unsecured Debt [Member]
Debt Instrument [Line Items]
Unsecured Debt And Revolving Credit Facility	$1,347,159,000	$1,646,725,000
Interest Rate, End of Period (in percentage)	3.89%

Redeemable_Noncontrolling_Inte2

Redeemable Noncontrolling Interests (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Redeemable Noncontrolling Interest Units Table [Abstract]
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	$1,336,780	$1,002,620
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount	1,000	1,000
Redeemable Noncontrolling Interests Rollforward [Abstract]
Reedemable Noncontrolling Interest, Beginning Balance	1,003,620	944,152
Net Income	47,613	24,817
Other comprehensive income (loss)	1,323	5,296	-6,707
Distributions	-33,469	-34,053
Cumulative Redeemable Preferred Units Redemption Amount		-36,900
Other, net	30,690	17,373
Reedemable Noncontrolling Interest, Ending Balance	1,337,780	1,003,620	944,152
Common Class A [Member]
Redeemable Noncontrolling Interest Units Table [Abstract]
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	1,336,780	1,002,620
Outstanding Partnership Units held by Third Parties	11,356,550	11,292,038
Preferred Or Annual Distribution Rate (in dollars per share)	$2.92
Redeemable Noncontrolling Interests Rollforward [Abstract]
Redemption of Class A units for common shares, at redemption value	-27,273	-25,317
Adjustment to carry Class A redeemable units at redemption value	315,276	108,252
Series D16 Cumulative Redeemable Preferred Unit [Member]
Redeemable Noncontrolling Interest Units Table [Abstract]
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount	1,000	1,000
Outstanding Partnership Units held by Third Parties	1	1
Par or Stated Value Per Share	$1,000,000
Preferred Or Annual Distribution Rate (in dollars per share)	$50,000
Dividend Percentage	5.00%
Cumulative Redeemable Preferred Unit [Member]
Redeemable Noncontrolling Interest Units Table [Abstract]
Outstanding Partnership Units held by Third Parties	1	1
Redeemable Noncontrolling Interests Additional Disclosure [Abstract]
Fair value of Series G convertible preferred units and Series D-13 cumulative redeemable preferred units	$55,097	$55,097

Shareholders_Equity_Details

Shareholders Equity (Details) (USD $)	3 Months Ended				12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common Stock Number Of Shares Par Value And Other Disclosures Abstract
Common shares of beneficial interest: outstanding shares	187,887,498				187,887,498	187,284,688
Dividends paid on common shares					$547,831	$545,913	$699,318
Dividends per common share	$0.73	$0.73	$0.73	$0.73
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred shares of beneficial interest: issued shares	52,678,939				52,678,939	52,682,807
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	1,277,026				1,277,026	1,277,225
Preferred shares of beneficial interest: outstanding shares	52,678,939				52,678,939	52,682,807
Preferred shares of beneficial interest: authorized shares	110,000,000				110,000,000	110,000,000
Accumulated Other Comprehensive Income Loss Net Of Tax	93,267				93,267	71,537
Series A Preferred Stock [Member] | Convertible Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock Dividend Rate Percentage					6.50%
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	1,393				1,393	1,592
Preferred shares of beneficial interest: outstanding shares	28,939				28,939	32,807
Preferred Stock Liquidation Preference (in dollars per share)	$50				$50
Preferred Stock, Dividend Rate, Per-Dollar-Amount					$3.25
Preferred shares of beneficial interest: authorized shares	83,977				83,977	83,977
Conversion Rate of Preferred Stock to Common Stock, Shares	1.4334				1.4334
Series G Preferred Stock [Member] | Redeemable Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock Dividend Rate Percentage					6.63%
Preferred Stock Redemption Price Per Share	$25				$25
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	193,135				193,135	193,135
Preferred shares of beneficial interest: outstanding shares	8,000,000				8,000,000	8,000,000
Preferred Stock Liquidation Preference (in dollars per share)	$25				$25
Preferred Stock, Dividend Rate, Per-Dollar-Amount					$1.66
Preferred shares of beneficial interest: authorized shares	8,000,000				8,000,000	8,000,000
Series I Preferred Stock [Member] | Redeemable Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock Dividend Rate Percentage					6.63%
Preferred Stock Redemption Price Per Share	$25				$25
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	262,379				262,379	262,379
Preferred shares of beneficial interest: outstanding shares	10,800,000				10,800,000	10,800,000
Preferred Stock Liquidation Preference (in dollars per share)	$25				$25
Preferred Stock, Dividend Rate, Per-Dollar-Amount					$1.66
Preferred shares of beneficial interest: authorized shares	10,800,000				10,800,000	10,800,000
Series J Preferred Stock [Member] | Redeemable Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock Dividend Rate Percentage					6.88%
Preferred Stock Redemption Price Per Share	$25				$25
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	238,842				238,842	238,842
Preferred shares of beneficial interest: outstanding shares	9,850,000				9,850,000	9,850,000
Preferred Stock Liquidation Preference (in dollars per share)	$25				$25
Preferred Stock, Dividend Rate, Per-Dollar-Amount					$1.72
Preferred shares of beneficial interest: authorized shares	9,850,000				9,850,000	9,850,000
Series K Preferred Stock [Member] | Redeemable Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock Dividend Rate Percentage					5.70%
Preferred Stock Redemption Price Per Share	$25				$25
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	290,971				290,971	290,971
Preferred shares of beneficial interest: outstanding shares	12,000,000				12,000,000	12,000,000
Preferred Stock Liquidation Preference (in dollars per share)	$25				$25
Preferred Stock, Dividend Rate, Per-Dollar-Amount					$1.43
Preferred shares of beneficial interest: authorized shares	12,000,000				12,000,000	12,000,000
Series L Preferred Stock [Member] | Redeemable Preferred Stock [Member]
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock Dividend Rate Percentage					5.40%
Preferred Stock Redemption Price Per Share	$25				$25
Details Of Preferred Shares Of Beneficial Interest [Abstract]
Preferred Stock, Value	$290,306				$290,306	$290,306
Preferred shares of beneficial interest: outstanding shares	12,000,000				12,000,000	12,000,000
Preferred Stock Liquidation Preference (in dollars per share)	$25				$25
Preferred Stock, Dividend Rate, Per-Dollar-Amount					$1.35
Preferred shares of beneficial interest: authorized shares	12,000,000				12,000,000	12,000,000

Shareholders_Equity_Details_1

Shareholders Equity (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Accumulated other comprehensive (loss) income, Beginning Balance	$71,537
Net current period OCI	21,730
Accumulated other comprehensive (loss) income, Ending Balance	93,267
Interest rate Swap [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	-31,882
Net current period OCI	6,079
Accumulated other comprehensive (loss) income, Ending Balance	-25,803
Securities available for sale [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	119,309
Net current period OCI	14,465
Accumulated other comprehensive (loss) income, Ending Balance	133,774
Pro Rata Share Of Non Consolidated Subsidiaries Oci [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	-11,501
Net current period OCI	2,509
Accumulated other comprehensive (loss) income, Ending Balance	-8,992
Other [Member]
Accumulated other comprehensive (loss) income, Beginning Balance	-4,389
Net current period OCI	-1,323
Accumulated other comprehensive (loss) income, Ending Balance	($5,712)

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2014
In Thousands, unless otherwise specified
Consolidated Variable Interest Entities [Member] | Independence Plaza And Warner Building [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net	$0
Consolidated Variable Interest Entities [Member] | One Park Avenue, Independence Plaza, And Warner Building [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net		0
Non Consolidated Variable Interest Entities [Member] | Independence Plaza And Warner Building [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	152,929
Non Consolidated Variable Interest Entities [Member] | One Park Avenue, Independence Plaza, And Warner Building [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets		$286,783

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narratives) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Investments	Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate Fund investments (in US Dollars)	$513,973,000	$667,710,000
Toys R Us [Member] | Discounted Cash Flow Methodology [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	5.75
Financial Projections Period	5 years
Discount rates	10.00%
Fair Value Inputs Tax Rate	38.00%
Minimum [Member] | Toys R Us [Member] | Market Multiple Methodology [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	5.75
Minimum [Member] | Toys R Us [Member] | Comparable Sales Methodology [Member]
Fair Value Inputs [Abstract]
Fair Value Assumptions, Sales Of Comparable Companies (in US Dollars)	150,000,000
Minimum [Member] | Toys R Us [Member] | Black Scholes Valuation Analysis [Member]
Fair Value Inputs [Abstract]
Fair Value Assumptions Expiration Periods	1 year
Fair Value Assumptions, Expected Volatility Rate	24.00%
Maximum [Member] | Toys R Us [Member] | Market Multiple Methodology [Member]
Fair Value Inputs [Abstract]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple	6.5
Maximum [Member] | Toys R Us [Member] | Comparable Sales Methodology [Member]
Fair Value Inputs [Abstract]
Fair Value Assumptions, Sales Of Comparable Companies (in US Dollars)	3,000,000,000
Maximum [Member] | Toys R Us [Member] | Black Scholes Valuation Analysis [Member]
Fair Value Inputs [Abstract]
Fair Value Assumptions Expiration Periods	3 years
Fair Value Assumptions, Expected Volatility Rate	29.00%
Weighted Average [Member] | Toys R Us [Member] | Black Scholes Valuation Analysis [Member]
Fair Value Inputs [Abstract]
Fair Value Assumptions Expiration Periods	2 years
Real Estate Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number Of Investments Held By Fund	7	9
Real Estate Fund investments (in US Dollars)	513,973,000	667,710,000
Excess of fair value over cost	$176,899,000
Real Estate Fund [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Anticipated Investment Holding Period	0 years 9 months 18 days
Fair Value Inputs [Abstract]
Discount rates	12.00%
Real Estate Fund [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement Anticipated Investment Holding Period	6 years 0 months 0 days
Fair Value Inputs [Abstract]
Discount rates	17.50%
Real Estate Fund [Member] | Weighted Average [Member]
Fair Value Inputs [Abstract]
Discount rates	13.70%

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	$206,323	$191,917
Real Estate Fund Nondepreciable Real Estate	513,973	667,710
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	206,323	191,917
Real Estate Fund Nondepreciable Real Estate	513,973	667,710
Deferred Compensation Plan Assets	117,284	116,515
Total assets	837,580	976,142
Mandatorily redeemable instruments (included in other liabilities)	55,097	55,097
Interest rate swap (included in other liabilities)	25,797	31,882
Total liabilities	80,894	86,979
Other Partners Ownership Interest In Real Estate Fund (in percentage)	75.00%	75.00%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate, Net at Fair Value	4,848	354,341
Total Assets, Nonrecurring		437,565
Fair Value, Measurements, Nonrecurring [Member] | Toys R Us [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in Partially Owned Entities at Fair Value		83,224
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	206,323	191,917
Real Estate Fund Nondepreciable Real Estate	0	0
Deferred Compensation Plan Assets	53,969	47,733
Total assets	260,292	239,650
Mandatorily redeemable instruments (included in other liabilities)	55,097	55,097
Interest rate swap (included in other liabilities)	0	0
Total liabilities	55,097	55,097
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate, Net at Fair Value	0	0
Total Assets, Nonrecurring		0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Toys R Us [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in Partially Owned Entities at Fair Value		0
Fair Value Inputs Level 2 Member | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	0	0
Real Estate Fund Nondepreciable Real Estate	0	0
Deferred Compensation Plan Assets	0	0
Total assets	0	0
Mandatorily redeemable instruments (included in other liabilities)	0	0
Interest rate swap (included in other liabilities)	25,797	31,882
Total liabilities	25,797	31,882
Fair Value Inputs Level 2 Member | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate, Net at Fair Value	0	0
Total Assets, Nonrecurring		0
Fair Value Inputs Level 2 Member | Fair Value, Measurements, Nonrecurring [Member] | Toys R Us [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in Partially Owned Entities at Fair Value		0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities	0	0
Real Estate Fund Nondepreciable Real Estate	513,973	667,710
Deferred Compensation Plan Assets	63,315	68,782
Total assets	577,288	736,492
Mandatorily redeemable instruments (included in other liabilities)	0	0
Interest rate swap (included in other liabilities)	0	0
Total liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real Estate, Net at Fair Value	4,848	354,341
Total Assets, Nonrecurring		437,565
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Toys R Us [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in Partially Owned Entities at Fair Value		$83,224

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Real Estate Fund [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	$667,710	$600,786
Purchases	3,392	43,816
Sales/Dispositions/Distributions	-307,268	-70,848
Net realized gains	73,802	85,771
Net unrealized gains	76,337	8,184
Other, Net	0	1
Closing Balance - changes in Level 3 " deferred compensation plan assets"	513,973	667,710
Real Estate Fund [Member] | Minimum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	12.00%
Terminal capitalization rates	4.70%
Fair Value Measurement Anticipated Investment Holding Period	0 years 9 months 18 days
Real Estate Fund [Member] | Maximum [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	17.50%
Terminal capitalization rates	6.50%
Fair Value Measurement Anticipated Investment Holding Period	6 years 0 months 0 days
Real Estate Fund [Member] | Weighted Average [Member]
Unobservable Quantitative Input [Abstract]
Discount rates	13.70%
Terminal capitalization rates	5.30%
Deferred Compensation Plan Assets [Member]
Unobservable Quantitative Input [Abstract]
Opening Balance - changes in Level 3 " deferred compensation plan assets"	68,782	62,631
Purchases	14,162	5,018
Sales/Dispositions/Distributions	-24,951	-7,306
Realized and unrealized gains	3,415	7,189
Other, Net	1,907	1,250
Closing Balance - changes in Level 3 " deferred compensation plan assets"	$63,315	$68,782

Fair_Value_Measurements_Detail2

Fair Value Measurements (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior unsecured notes	$1,347,159	$1,350,855
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	749,418	295,000
Mortgage and mezzanine loans receivable	16,748	170,972
Total assets	766,166	465,972
Mortgages payable	9,551,700	8,331,993
Senior unsecured notes	1,347,159	1,350,855
Revolving credit facility debt	0	295,870
Total debt	10,898,859	9,978,718
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	749,000	295,000
Mortgage and mezzanine loans receivable	17,000	171,000
Total assets	766,000	466,000
Mortgages payable	9,551,000	8,104,000
Senior unsecured notes	1,385,000	1,402,000
Revolving credit facility debt	0	296,000
Total debt	$10,936,000	$9,802,000

Stockbased_Compensation_Narrat

Stock-based Compensation (Narratives) (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense	$36,641	$34,914	$30,588
Full Value Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized (in Shares)	6,000,000
Share Based Compensation Shares Available For Grant (in Shares)	4,004,000
Not Full Value Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized (in Shares)	12,000,000
Out Performance Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense	6,185	3,226	2,826
Out Performance Plan [Abstract]
Award vesting in three years	33.00%
Award versting in four years	33.00%
Award vesting in five years	34.00%
Compensation Cost Not Yet Recognized	11,937
Compensation Cost Recognition Period	1 year 4 months 24 days
Out Performance Plan 2015 [Member]
Out Performance Plan [Abstract]
Out of performance plan notional amount	40,000
Required award holding period after versing	1 year
Fair Value Of Awards Granted	9,120
Award Amortization Period	5 years
Out Performance Plan 2015 [Member] | Absolute [Member]
Out Performance Plan [Abstract]
Duration Of Performance Measurement Period	3 years
Required Shareholder Return Per Year	7.00%
Required Shareholder Return Three Year	21.00%
Out Performance Plan 2015 [Member] | Relative [Member]
Out Performance Plan [Abstract]
Duration Of Performance Measurement Period	3 years
Required Shareholder Return Under Relative Component	6.00%
Percentage Of Shareholder Return Under Which No Awards Will Be Earned	0.00%
Out Performance Plan 2014 [Member]
Out Performance Plan [Abstract]
Out of performance plan notional amount	50,000
Required award holding period after versing	1 year
Fair Value Of Awards Granted	8,202
Award Amortization Period	5 years
Out Performance Plan 2014 [Member] | Absolute [Member]
Out Performance Plan [Abstract]
Duration Of Performance Measurement Period	3 years
Required Shareholder Return Per Year	7.00%
Required Shareholder Return Three Year	21.00%
Out Performance Plan 2014 [Member] | Relative [Member]
Out Performance Plan [Abstract]
Duration Of Performance Measurement Period	3 years
Required Shareholder Return Under Relative Component	6.00%
Percentage Of Shareholder Return Under Which No Awards Will Be Earned	0.00%
Out Performance Plan 2013 [Member]
Out Performance Plan [Abstract]
Out of performance plan notional amount	40,000
Required award holding period after versing	1 year
Fair Value Of Awards Granted	6,814
Award Amortization Period	5 years
Out Performance Plan 2013 [Member] | Absolute [Member]
Out Performance Plan [Abstract]
Duration Of First Performance Measurement Period	2 years
Duration Of Second Performance Measurement Period	3 years
Required Shareholder Return Per Two Year	14.00%
Required Shareholder Return Three Year	21.00%
Out Performance Plan 2013 [Member] | Relative [Member]
Out Performance Plan [Abstract]
Duration Of First Performance Measurement Period	2 years
Duration Of Second Performance Measurement Period	3 years
Required Shareholder Return Under Relative Component	6.00%
Percentage Of Shareholder Return Under Which No Awards Will Be Earned	0.00%
Out Performance Plan 2012 [Member]
Out Performance Plan [Abstract]
Out of performance plan notional amount	40,000
Fair Value Of Awards Granted	12,250
Award Amortization Period	5 years
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense	4,550	8,234	8,638
Out Performance Plan [Abstract]
Compensation Cost Not Yet Recognized	1,855
Compensation Cost Recognition Period	1 year 6 months 0 days
Stock options expiration term	10 years
Award Vesting Period	4 years
Share Based Compensation Employee Stock Purchase Plan Activity [Abstract]
Grant Date Fair Value Of Options (in dollars per shares)	$20.31	$17.18	$17.50
Cash Received From Exercise Of Stock Options	17,441	5,915	9,546
Total Intrinsic Value Of Options Excercised	18,223	3,386	40,887
Restricted Stock Units RSU [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense	1,303	1,344	1,604
Out Performance Plan [Abstract]
Compensation Cost Not Yet Recognized	1,468
Compensation Cost Recognition Period	1 year 8 months 12 days
Dividends Paid On Nonvested Units	88	110	200
Fair Value Of Awards Granted	1,048	857	929
Award Vesting Period	4 years
Fair Value Of Awards Vested	1,174	1,194	1,864
Restricted Operating Partnership Units Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share Based Compensation Expense	24,603	22,110	17,520
Out Performance Plan [Abstract]
Compensation Cost Not Yet Recognized	20,798
Compensation Cost Recognition Period	1 year 8 months 12 days
Dividends Paid On Nonvested Units	2,866	2,598	3,203
Fair Value Of Awards Granted	19,669	31,947	16,464
Award Vesting Period	4 years
Fair Value Of Awards Vested	$22,758	$16,404	$15,014

Stockbased_Compensation_Detail

Stock-based Compensation (Details 1) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Units RSU [Member]
Share Based Compensation Equity Instruments Other Than Options Plan Activity [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period	$79.24
Units Granted Weighted Average Grant Date Fair Value	$91.31
Awards Vested Weighted Average Grant Date Fair Value	$74.61
Units Cancelled Weighted Average Grant Date Fair Value	$87.42
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, End of Period	$87.58
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance	29,664
Restricted Stock Granted Shares	11,475
Units Vested	-15,733
Forfeited Units	-2,957
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	22,449
Restricted Operating Partnership Units Plan [Member]
Share Based Compensation Equity Instruments Other Than Options Plan Activity [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning of Period	$76.27
Units Granted Weighted Average Grant Date Fair Value	$86.79
Awards Vested Weighted Average Grant Date Fair Value	$69.48
Units Cancelled Weighted Average Grant Date Fair Value	$83.16
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, End of Period	$83.20
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance	765,971
Restricted Stock Granted Shares	226,638
Units Vested	-327,555
Forfeited Units	-6,575
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance	658,479
Employee Stock Option [Member]
Share Based Compensation Employee Stock Purchase Plan Activity [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period	$67.51
Stock Options Granted Weighted Average Exercise Price	$91.32
Stock Options Exercised Weighted Average Exercise Price	$67.27
Stock Options Cancelled Weighted Average Exercise Price	$104.74
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period	$67.38	$67.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning Balance	3,248,699
Stock Options Granted Shares	49,088
Stock Options Exercised Shares	-434,204
Stock Options Cancelled Shares	-43,468
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance	2,820,115	3,248,699
Options Vested And Expected To Vest Shares	2,818,587
Options Vested And Expected To Vest Weighted Average Exercise Price	$67.37
Options Excercisable Shares	2,606,260
Options Excercisable Weighted Average Exercise Price	$65.62
Options Exercisable Weighted Average Remaining Contractual Term	4 years 4 months 24 days
Options Outstanding Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Options Vested And Expected To Vest Weighted Average Remaining Contractual Term	4 years 7 months 6 days
Options Outstanding Aggregate Intrinsic Value (in US dollars)	$145,317
Options Vested And Expected To Vest Aggregate Intrinsic Value (in US dollars)	145,271
Options Excercisable Aggregate Intrinsic Value (in US dollars)	$138,912
Fair Value Assumptions Expected Volatility Rate	36.00%	36.00%	36.00%
Fair Value Assumptions Expected Life	5 years	5 years	5 years
Fair Value Assumptions Risk Free Interest Rate	1.81%	0.91%	1.05%
Fair Value Assumptions Risk Expected Dividend Yield (in percentage)	4.10%	4.30%	4.30%

Fee_and_Other_Income_Details

Fee and Other Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fee And Other Income [Line Items]
BMS cleaning fees	$85,658	$66,505	$67,584
Signage Revenue	37,929	32,866	20,892
Management and leasing fees	21,382	24,637	21,849
Lease termination fees	17,042	92,497	2,361
Other income	33,734	34,113	31,438
Fee and other income	195,745	250,618	144,124
Stop & Shop [Member]
Loss Contingencies [Line Items]
Complaint Regarding Rent Allocation		6,000
Gain related to litigation settlement		59,599
New York 1290 Avenue Of Americas [Member]
Fee And Other Income [Line Items]
Lease termination fees		19,500
Write Off Of Straight Lining Of Rent		1,529
Equity method ownership percentage		70.00%
Cuyahoga County [Member]
Fee And Other Income [Line Items]
Lease termination fees		3,000
Vornado Realty Trust [Member] | New York 1290 Avenue Of Americas [Member]
Fee And Other Income [Line Items]
Lease termination fees		$12,121

Interest_and_Other_Investment_2

Interest and Other Investment Income (Loss), Net (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends and interest on marketable securities	$12,707	$11,446	$11,979
Mark-to-market of investments in our deferred compensation plan	11,557	10,636	6,809
Interest on mezzanine loans receivable	3,920	19,495	13,861
Losses from the disposition of investment in J.C. Penney	0	-72,974	-300,752
Other, net	10,603	6,521	6,924
Interest and other investment (loss) income, net	$38,787	($24,876)	($261,179)

Interest_and_Debt_Expense_Deta

Interest and Debt Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Expense Debt [Abstract]
Interest expense	$483,578	$498,050	$478,688
Amortization of deferred financing costs	46,923	25,557	22,907
Capitalized interest and debt expenses	-62,786	-42,303	-16,801
Interest and Debt Expense, Total	$467,715	$481,304	$484,794

Income_Per_Share_Details

Income Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Per Share [Abstract]
Income from continuing operations, net of income attributable to noncontrolling interests									$379,333	$57,727	$408,439
Income from discontinued operations, net of income attributable to noncontrolling interests									485,519	418,244	208,821
Net income attributable to Vornado									864,852	475,971	617,260
Preferred share dividends									-81,464	-82,807	-76,937
Preferred unit and share redemptions									0	-1,130	8,948
Net income Attributable to Common Shareholders	513,238	131,159	76,642	62,349	-68,887	83,005	145,926	231,990	783,388	392,034	549,271
Earnings allocated to unvested participating securities									-125	-110	-202
Numerator for basic income per share									783,263	391,924	549,069
Convertible preferred share dividends									97	0	113
Numerator for diluted income per share									$783,360	$391,924	$549,182
Denominator for basic income per share - weighted average shares									187,572	186,941	185,810
Employee stock options and restricted share awards (in shares)									1,075	768	670
Convertible preferred shares									43	0	50
Denominator for diluted income per share - weighted average shares and assumed conversions (in shares)									188,690	187,709	186,530
INCOME PER COMMON SHARE - BASIC:
Income (loss) from continuing operations, net (in dollars per share)									$1.59	($0.14)	$1.83
Income from discontinued operations, net (in dollars per share)									$2.59	$2.24	$1.12
Net income per common share (in dollars per share)	$2.73	$0.70	$0.41	$0.33	($0.37)	$0.44	$0.78	$1.24	$4.18	$2.10	$2.95
INCOME PER COMMON SHARE - DILUTED:
Iincome (loss) from continuing operations, net (in dollars per share)									$1.58	($0.14)	$1.82
Income from discontinued operations, net (in dollars per share)									$2.57	$2.23	$1.12
Net income per common share (in dollars per share)	$2.72	$0.69	$0.41	$0.33	($0.37)	$0.44	$0.78	$1.24	$4.15	$2.09	$2.94

Income_Per_Share_Parenthetical

Income Per Share (Parentheticals) (Details)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Per Share [Abstract]
Weighted average common share equivalents of excluded dilutive securities due to anti-dilutive effect	11,238	11,752	14,400

Leases_Details

Leases (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Tenants	Tenants	Tenants
Concentration Risk [Line Items]
Number Of Tenants Contributing Ten Percent Or More Of Total Revenues	0	0	0
Operating Leases Future Minimum Payments Receivable [Abstract]
2015	$1,783,293
2016	1,717,984
2017	1,671,172
2018	1,578,671
2019	1,399,001
Thereafter	8,055,804
Percentage Rent	7,963	8,578	8,090
Operating Leases Future Minimum Payments Due [Abstract]
2015	39,925
2016	39,833
2017	41,003
2018	38,920
2019	38,992
Thereafter	1,252,109
Lessee Leasing Arrangements Operating Leases Term Of Contract	30 years
Rent Expense	50,556	49,968	41,778
Capital Leases Future Minimum Payments Due [Abstract]
2015	12,500
2016	12,500
2017	12,500
2018	12,500
2019	12,500
Thereafter	334,792
Total Minimum Obligations	397,292
Interest Portion	-157,292
Present Value Of Net Minimum Payments	240,000
Property Leased Under Capital Leases Cost	$249,253
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Percentage Of Minimum Revenue Threshold Contributed By One Tenant	10.00%	10.00%	10.00%

Multiemployer_Plans_Details

Multiemployer Plans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Multiemployer Plans, Pension [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions	$11,431	$10,223	$10,683
Multiemployer Plans, Period Contributions, Significance of Contributions	FALSE
Multiemployer Plans, Healthcare Benefit [Member]
Multiemployer Plans [Line Items]
Multiemployer Plan, Period Contributions	$29,073	$26,262	$26,759

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 01, 2016
Loss Contingencies [Line Items]
Guarantees and master leases	$359,000,000
Outstanding letters of credit	39,552,000
Commitment to fund additional capital to partially owned entities	104,000,000
NBCR Losses [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	2,000,000,000
Federal government deductible, percentage of balance of a covered loss	85.00%
NBCR Losses [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Federal government deductible, percentage of balance of a covered loss		84.00%
Earthquake California Properties [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	180,000,000
Vornado deductible, percentage of property value	5.00%
Vornado deductible, annual aggregate	180,000,000
All Risk And Rental Value [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	2,000,000,000
General Liability [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	300,000,000
Terrorism Acts [Member]
Loss Contingencies [Line Items]
Insurance limit per occurrence	4,000,000,000
PPIC [Member] | NBCR Losses [Member]
Loss Contingencies [Line Items]
Insurance deductible	$3,200,000
Insurance Deductible Percentage Of Balance Of Covered Loss	15.00%
PPIC [Member] | NBCR Losses [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
Insurance Deductible Percentage Of Balance Of Covered Loss		16.00%

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 15, 2015
Urban Edge Properties [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Cash Considerations Transferred During Spin Off				$225,000,000
Equity method ownership percentage				5.40%
Retail Segment Strip Shopping Centers [Member]
Related Party Transaction [Line Items]
Number Of Real Estate Properties	22
Retail Segment Strip Shopping Centers [Member] | Urban Edge Properties [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Number Of Real Estate Properties				79
Retail Segment Regional Malls [Member] | Urban Edge Properties [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Number Of Real Estate Properties				3
Warehouse [Member] | Urban Edge Properties [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Number Of Real Estate Properties				1
Alexanders Inc [Member]
Related Party Transaction [Line Items]
Percentage of Affiliated Entity Owned By Company	32.40%
Percentage Of Affiliated Entity Owned By Related Parties	26.30%
Interstate Properties [Member]
Related Party Transaction [Line Items]
Percentage of Company Owned by Related Party	6.60%
Related Party Transaction Annual Fee Percentage	4.00%
Fee And Other Income From Related Parties (in US dollars)	535,000	$606,000	$794,000
Term Of Management Agreement	1 year
Period Allowed For Termination Of Automatic Renewal Of Management Agreement	60 days
Related Party Transaction Description Of Transaction	We manage and lease the real estate assets of Interstate pursuant to a management agreement for which we receive an annual fee equal to 4% of annual base rent and percentage rent. The management agreement has a term of one year and is automatically renewable unless terminated by either of the parties on 60 days’ notice at the end of the term. We believe, based upon comparable fees charged by other real estate companies, that the management agreement terms are fair to us.

Summary_of_Quarterly_Results_D

Summary of Quarterly Results (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$679,101	$657,209	$652,972	$646,658	$649,403	$655,883	$658,550	$705,433	$2,635,940	$2,669,269	$2,649,217
Net income (loss) attributable to common shareholders	$513,238	$131,159	$76,642	$62,349	($68,887)	$83,005	$145,926	$231,990	$783,388	$392,034	$549,271
Net income (loss) per common share - Basic	$2.73	$0.70	$0.41	$0.33	($0.37)	$0.44	$0.78	$1.24	$4.18	$2.10	$2.95
Net income (loss) per common share - Diluted	$2.72	$0.69	$0.41	$0.33	($0.37)	$0.44	$0.78	$1.24	$4.15	$2.09	$2.94

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total Revenues	$679,101	$657,209	$652,972	$646,658	$649,403	$655,883	$658,550	$705,433	$2,635,940	$2,669,269	$2,649,217
Total expenses									1,820,298	1,819,009	1,921,425
Operating income (loss)									815,642	850,260	727,792
(Loss) income from partially owned entities, including Toys									-58,131	-338,785	423,126
Income from real estate fund									163,034	102,898	63,936
Interest and other investment income (loss), net									38,787	-24,876	-261,179
Interest and debt expense									-467,715	-481,304	-484,794
Net gain on disposition of wholly owned and partially owned assets									13,568	3,407	13,347
Income (loss) before income taxes									505,185	111,600	482,228
Income tax expense									-11,002	6,406	-8,132
Income (loss) from continuing operations									494,183	118,006	474,096
Income from discontinued operations									514,843	446,734	220,445
Net income (loss)									1,009,026	564,740	694,541
Less net income attributable to noncontrolling interests									-144,174	-88,769	-77,281
Net income attributable to Vornado									864,852	475,971	617,260
Interest and debt expense (2)									654,398	758,781	760,523
Depreciation and amortization (2)									685,973	732,757	735,293
Income tax (benefit) expense (2)									24,248	26,371	7,026
EBITDA									2,229,471	1,993,880	2,120,102
Real estate at cost	18,845,392				17,418,946				18,845,392	17,418,946	17,365,533	15,444,754
Investments in partially owned entities	1,246,496				1,249,667				1,246,496	1,249,667	1,704,297
Total assets	21,248,320				20,097,224				21,248,320	20,097,224	22,065,049
New York Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues									1,520,845	1,470,907	1,319,470
Total expenses									946,466	910,498	835,563
Operating income (loss)									574,379	560,409	483,907
(Loss) income from partially owned entities, including Toys									20,701	15,527	207,773
Income from real estate fund									0	0	0
Interest and other investment income (loss), net									6,711	5,357	4,002
Interest and debt expense									-183,427	-181,966	-146,350
Net gain on disposition of wholly owned and partially owned assets									0	0	0
Income (loss) before income taxes									418,364	399,327	549,332
Income tax expense									-4,305	-2,794	-3,491
Income (loss) from continuing operations									414,059	396,533	545,841
Income from discontinued operations									463,163	160,314	30,293
Net income (loss)									877,222	556,847	576,134
Less net income attributable to noncontrolling interests									-8,626	-10,786	-2,138
Net income attributable to Vornado									868,596	546,061	573,996
Interest and debt expense (2)									241,959	236,645	187,855
Depreciation and amortization (2)									324,239	293,974	252,257
Income tax (benefit) expense (2)									4,395	3,002	3,751
EBITDA									1,439,189	1,079,682	1,017,859
Real estate at cost	9,732,818				8,422,297				9,732,818	8,422,297	8,687,141
Investments in partially owned entities	1,036,130				904,278				1,036,130	904,278	576,336
Total assets	10,752,763				9,255,964				10,752,763	9,255,964	9,215,438
Washington DC Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues									537,151	541,161	554,028
Total expenses									358,019	347,686	360,056
Operating income (loss)									179,132	193,475	193,972
(Loss) income from partially owned entities, including Toys									-3,677	-6,968	-5,612
Income from real estate fund									0	0	0
Interest and other investment income (loss), net									183	129	126
Interest and debt expense									-75,395	-102,277	-115,574
Net gain on disposition of wholly owned and partially owned assets									0	0	0
Income (loss) before income taxes									100,243	84,359	72,912
Income tax expense									-242	14,031	-1,650
Income (loss) from continuing operations									100,001	98,390	71,262
Income from discontinued operations									0	0	167,766
Net income (loss)									100,001	98,390	239,028
Less net income attributable to noncontrolling interests									0	0	0
Net income attributable to Vornado									100,001	98,390	239,028
Interest and debt expense (2)									89,448	116,131	133,625
Depreciation and amortization (2)									145,853	142,409	157,816
Income tax (benefit) expense (2)									288	-15,707	1,943
EBITDA									335,590	341,223	532,412
Real estate at cost	4,383,418				4,243,048				4,383,418	4,243,048	4,171,879
Investments in partially owned entities	102,635				100,543				102,635	100,543	95,670
Total assets	4,310,974				4,107,636				4,310,974	4,107,636	4,196,694
Retail Properties Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues									326,947	372,435	318,566
Total expenses									197,206	199,650	189,480
Operating income (loss)									129,741	172,785	129,086
(Loss) income from partially owned entities, including Toys									1,730	2,097	1,458
Income from real estate fund									0	0	0
Interest and other investment income (loss), net									35	11	21
Interest and debt expense									-54,754	-55,219	-53,772
Net gain on disposition of wholly owned and partially owned assets									0	1,377	8,491
Income (loss) before income taxes									76,752	121,051	85,284
Income tax expense									-1,721	-2,311	0
Income (loss) from continuing operations									75,031	118,740	85,284
Income from discontinued operations									50,873	287,067	-52,561
Net income (loss)									125,904	405,807	32,723
Less net income attributable to noncontrolling interests									-119	-3,065	1,812
Net income attributable to Vornado									125,785	402,742	34,535
Interest and debt expense (2)									59,322	63,803	79,462
Depreciation and amortization (2)									73,433	72,161	86,529
Income tax (benefit) expense (2)									1,721	2,311	0
EBITDA									260,261	541,017	200,526
Real estate at cost	2,057,374				2,060,093				2,057,374	2,060,093	2,108,328
Investments in partially owned entities	6,007				6,640				6,007	6,640	7,083
Total assets	3,580,803				3,374,896				3,580,803	3,374,896	3,583,999
Toys R Us Segment [Member]
Segment Reporting Information [Line Items]
(Loss) income from partially owned entities, including Toys									-73,556	-362,377	14,859
Income (loss) before income taxes									-73,556	-362,377	14,859
Income (loss) from continuing operations									-73,556	-362,377	14,859
Net income (loss)									-73,556	-362,377	14,859
Less net income attributable to noncontrolling interests									0	0	0
Net income attributable to Vornado									-73,556	-362,377	14,859
Interest and debt expense (2)									100,549	181,586	147,880
Depreciation and amortization (2)									64,533	135,178	135,179
Income tax (benefit) expense (2)									12,106	33,532	-16,629
EBITDA									103,632	-12,081	281,289
Real estate at cost	0				0				0	0	0
Investments in partially owned entities	0				83,224				0	83,224	478,041
Total assets	0				83,224				0	83,224	478,041
Other Segment [Member]
Segment Reporting Information [Line Items]
Total Revenues									250,997	284,766	457,153
Total expenses									318,607	361,175	536,326
Operating income (loss)									-67,610	-76,409	-79,173
(Loss) income from partially owned entities, including Toys									-3,329	12,936	204,648
Income from real estate fund									163,034	102,898	63,936
Interest and other investment income (loss), net									31,858	-30,373	-265,328
Interest and debt expense									-154,139	-141,842	-169,098
Net gain on disposition of wholly owned and partially owned assets									13,568	2,030	4,856
Income (loss) before income taxes									-16,618	-130,760	-240,159
Income tax expense									-4,734	-2,520	-2,991
Income (loss) from continuing operations									-21,352	-133,280	-243,150
Income from discontinued operations									807	-647	74,947
Net income (loss)									-20,545	-133,927	-168,203
Less net income attributable to noncontrolling interests									-135,429	-74,918	-76,955
Net income attributable to Vornado									-155,974	-208,845	-245,158
Interest and debt expense (2)									163,120	160,616	211,701
Depreciation and amortization (2)									77,915	89,035	103,512
Income tax (benefit) expense (2)									5,738	3,233	17,961
EBITDA									90,799	44,039	88,016
Real estate at cost	2,671,782				2,693,508				2,671,782	2,693,508	2,398,185
Investments in partially owned entities	101,724				154,982				101,724	154,982	547,167
Total assets	$2,603,780				$3,275,504				$2,603,780	$3,275,504	$4,590,877

Segment_Information_Parentheti

Segment Information (Parentheticals) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	$2,229,471	$1,993,880	$2,120,102
Mark-to-market of investments in our deferred compensation plan	11,557	10,636	6,809
Retail Segment Strip Shopping Centers [Member]
Segment Reporting Information [Line Items]
Transaction Costs Spin Off	14,956
New York Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	1,439,189	1,079,682	1,017,859
New York Segment [Member] | Alexanders Inc [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	41,746	42,210	231,402
New York Segment [Member] | Alexanders Inc [Member] | Net Gain On Sale Of Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain (Loss) from Disposal of Discontinued Operation			179,934
New York Segment [Member] | Hotel Pennsylvania [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	30,753	30,723	28,455
New York Segment [Member] | Retail Properties [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	281,428	246,808	189,484
New York Segment [Member] | Office Building [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	1,085,262	759,941	568,518
New York Segment [Member] | Office Building [Member] | Net Gain On Sale Of Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain (Loss) from Disposal of Discontinued Operation	440,537	127,512
Washington DC Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	335,590	341,223	532,412
Washington DC Segment [Member] | Washington Dc Office Excluding Skyline Properties [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	266,859	268,373	449,448
Washington DC Segment [Member] | Washington Dc Office Excluding Skyline Properties [Member] | Net Gain On Sale Of Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain (Loss) from Disposal of Discontinued Operation			163,367
Washington DC Segment [Member] | Washington DC Skyline Properties [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	27,150	29,499	40,037
Washington DC Segment [Member] | Washington Dc Residential Property [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	41,581	43,351	42,927
Washington DC Segment [Member] | Office Building [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	294,009	297,872	489,485
Retail Properties Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	260,261	541,017	200,526
Retail Properties Segment [Member] | Retail Segment Strip Shopping Centers [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	219,122	285,612	172,708
Gain related to litigation settlement		59,599
Retail Properties Segment [Member] | Retail Segment Strip Shopping Centers [Member] | Impairment Loss [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Impairment Of Real Estate	5,676	19,000	33,775
Retail Properties Segment [Member] | Retail Segment Strip Shopping Centers [Member] | Net Gain On Sale Of Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain (Loss) from Disposal of Discontinued Operation	66,023	81,806	15,821
Retail Properties Segment [Member] | Retail Segment Regional Malls [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	41,139	255,405	27,818
Retail Properties Segment [Member] | Retail Segment Regional Malls [Member] | Impairment Loss [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Impairment Of Real Estate	20,842	13,443	70,100
Retail Properties Segment [Member] | Retail Segment Regional Malls [Member] | Net Gain On Sale Of Real Estate [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain (Loss) from Disposal of Discontinued Operation		202,275
Other Segment [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	90,799	44,039	88,016
Other Segment [Member] | Real Estate Fund [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	70,306	49,471	24,604
Other Segment [Member] | Merchandise Mart Other [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	79,636	74,270	62,470
Other Segment [Member] | Other Properties 555 California Street [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	48,844	42,667	46,167
Other Segment [Member] | India real estate ventures [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	6,434	5,841	3,654
Other Segment [Member] | LNR [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	20,443	75,202
Other Segment [Member] | Lexington Realty Trust [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	6,931	32,595
Other Segment [Member] | Lexington Realty Trust [Member] | Net Gains From Stock Issuances [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	0	28,763
Other Segment [Member] | Other Investments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	17,270	18,981	25,612
Other Segment [Member] | Corporate General And Administrative Expenses [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	-94,929	-94,904	-89,082
Other Segment [Member] | Investment Income and other, net [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	31,665	46,525	45,563
Other Segment [Member] | Acquisition and transaction related costs, and impairment losses [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	-31,348	-24,857	-17,386
Other Segment [Member] | Net Gain On Sale Of Marketable Securities Land Parcels And Residential Condominimums [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	13,568	56,868	4,856
Other Segment [Member] | Our share of debt satisfaction gains and net gains on sale of real estate [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	13,000	0	0
Other Segment [Member] | Suffolk Downs impairment loss and loan reserve [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	-10,263	0	0
Other Segment [Member] | Our share of impairment losses of partially owned entities [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	-5,771	0	-4,936
Other Segment [Member] | Loss On Sale Of J C Penney Common Shares [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	-127,888	-300,752
Other Segment [Member] | Severance Costs [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	-5,492	-3,005
Other Segment [Member] | Merchandise Mart Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	0	93,588
Other Segment [Member] | Net income attributable to noncontrolling interests in the Operating Partnership [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	-47,563	-23,659	-35,327
Other Segment [Member] | Preferred Unit Distributions Of Operating Partnership [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	-50	-1,158	-9,936
Other Segment [Member] | Other EBITDA attributable to identifiable investments [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	222,490	218,604	270,304
Other Segment [Member] | Independence Plaza [Member] | Net Gain On Asset Purchase [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	0	0	105,366
Other Segment [Member] | Income before net realized / unrealized gains (Operations) [Member] | Real Estate Fund [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	8,056	7,752	6,385
Other Segment [Member] | Carried Interest [Member] | Real Estate Fund [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	24,715	18,230	4,379
Other Segment [Member] | Unrealized Gain From Mark To Market [Member] | Real Estate Fund [Member]
Segment Reporting Information [Line Items]
Earnings Before Interest, Taxes, Depreciation, and Amortization	$37,535	$23,489	$13,840

SEC_Schedule_II_Valuation_and_1

SEC Schedule II Valuation and Qualifying Accounts (Details) (Allowance For Doubtful Accounts [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance For Doubtful Accounts [Member]
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$32,069	$40,839	$46,531
Additions Charged Against Operations	3,614	11,417	9,697
Uncollectable Accounts Written-Off	-9,624	-20,187	-15,389
Balance at End of Year	$26,059	$32,069	$40,839

SEC_Schedule_III_Real_Estate_D

SEC Schedule III Real Estate (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Accumulated Depreciation	$3,629,135,000	$3,296,717,000	$2,966,067,000	$2,742,244,000
Property Plant And Equipment Useful Life	40 years
Net Basis Difference Of Assets And Liabilities Between Tax Basis And GAAP Basis	3,600,000,000
New York 1290 Avenue Of Americas [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	950,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	515,539,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	923,653,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	125,754,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	515,540,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,049,406,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	1,564,946,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	204,622,000
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York St. Regis Hotel [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	152,825,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	584,230,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	152,825,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	584,230,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	737,055,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,591,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2014
New York 350 Park Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	294,484,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	265,889,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	363,381,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	44,888,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	265,890,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	408,268,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	674,158,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	82,124,000
Real Estate And Accumulated Depreciation Year Of Construction	1960
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
New York Office 666 Fifth Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	390,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	189,005,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	471,072,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	189,005,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	471,072,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	660,077,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	25,020,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2012
New York Office One Penn Plaza [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	412,169,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	195,595,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	607,764,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	607,764,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	249,036,000
Real Estate And Accumulated Depreciation Year Of Construction	1972
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 100 West 33rd Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	223,242,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	242,776,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	247,970,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	31,257,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	242,777,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	279,226,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	522,003,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	52,608,000
Real Estate And Accumulated Depreciation Year Of Construction	1911
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 1535 Broadway Marriott Marquis [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	249,285,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	123,615,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	372,900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	372,900,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	528,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2012
New York Office 1540 Broadway [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	105,914,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	214,208,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	26,132,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	105,914,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	240,340,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	346,254,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	35,089,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
New York 655 Fifth Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	140,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	102,594,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	231,903,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	102,594,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	231,903,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	334,497,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	7,305,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
New York Office Two Penn Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	575,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	53,615,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	164,903,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	88,592,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	52,689,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	254,421,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	307,110,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	124,324,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office Manhattan Mall [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	101,758,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	88,595,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	113,473,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	71,769,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	88,595,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	185,242,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	273,837,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	44,006,000
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 770 Broadway [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	353,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	52,898,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	95,686,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	96,360,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	52,898,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	192,046,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	244,944,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	81,108,000
Real Estate And Accumulated Depreciation Year Of Construction	1907
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 90 Park Avenue [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	8,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	175,890,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	51,271,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	227,161,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	235,161,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	96,584,000
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office 888 Seventh Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	318,554,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	117,269,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	116,624,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	233,893,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	233,893,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	97,295,000
Real Estate And Accumulated Depreciation Year Of Construction	1980
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 909 Third Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	350,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	120,723,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	81,627,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	202,350,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	202,350,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	70,234,000
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1999
New York Office Eleven Penn Plaza [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	450,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	40,333,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	85,259,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	70,124,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	40,333,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	155,383,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	195,716,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	67,353,000
Real Estate And Accumulated Depreciation Year Of Construction	1923
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York 7 West 34th Street [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	179,579,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	34,614,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	144,965,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	179,579,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	58,186,000
Real Estate And Accumulated Depreciation Year Of Construction	1901
Real Estate And Accumulated Depreciation Year Of Acquisition	2000
New York Office 640 Fifth Avenue [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	38,224,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	25,992,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	113,920,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	38,224,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	139,912,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	178,136,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	70,078,000
Real Estate And Accumulated Depreciation Year Of Construction	1950
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office 150 East 58th Street [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	39,303,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	80,216,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	35,385,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	39,303,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	115,601,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	154,904,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	46,971,000
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 595 Madison Avenue [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	62,731,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	62,888,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	22,407,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	62,731,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	85,295,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	148,026,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	30,921,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1999
New York Office 828 To 850 Madison Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	80,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	107,937,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	28,261,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	10,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	107,937,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	28,271,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	136,208,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,831,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
New York Office 715 Lexington Avenue [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	26,903,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	63,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	63,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,903,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	89,903,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,553,000
Real Estate And Accumulated Depreciation Year Of Construction	1923
Real Estate And Accumulated Depreciation Year Of Acquisition	2001
New York Office 4 Union Square South [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	119,847,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	24,079,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	55,220,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,614,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	24,079,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	57,834,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	81,913,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	14,903,000
Real Estate And Accumulated Depreciation Year Of Construction	1965/2004
Real Estate And Accumulated Depreciation Year Of Acquisition	1993
New York Office 330 West 34th Street [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	8,599,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	67,997,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	76,596,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	76,596,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,957,000
Real Estate And Accumulated Depreciation Year Of Construction	1925
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 510 5th Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	30,154,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	34,602,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	18,728,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	18,806,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	34,602,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	37,534,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	72,136,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,541,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2010
New York Office 478 To 482 Broadway [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	20,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	13,375,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	28,546,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	20,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	41,921,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	61,921,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,490,000
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 20 Broad Street [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	28,760,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	27,302,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	56,062,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	56,062,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	19,666,000
Real Estate And Accumulated Depreciation Year Of Construction	1956
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 40 Fulton Street [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	15,732,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	26,388,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	13,932,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	15,732,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	40,320,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	56,052,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	16,298,000
Real Estate And Accumulated Depreciation Year Of Construction	1987
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 689 Fifth Avenue [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	19,721,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	13,446,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	19,764,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	19,721,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	33,210,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	52,931,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	7,999,000
Real Estate And Accumulated Depreciation Year Of Construction	1925
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
New York Office 443 Broadway [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	11,187,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	41,186,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	11,187,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	41,186,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	52,373,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,651,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
New York Office 40 East 66th Street [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	13,616,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	34,635,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	142,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,616,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	34,777,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	48,393,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	7,848,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
New York Office 155 Spring Street [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	13,700,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	30,544,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,469,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	33,013,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	46,713,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,589,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 435 7th Avenue [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	98,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	19,893,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	19,091,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	37,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	19,893,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	19,128,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	39,021,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,964,000
Real Estate And Accumulated Depreciation Year Of Construction	2002
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office 3040 M Street [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	7,830,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	27,490,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,256,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	7,830,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	30,746,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	38,576,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,978,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
New York Office 692 Broadway [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	6,053,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	22,908,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,536,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,053,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,444,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	32,497,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,124,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
New York Office 608 Fifth Avenue [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	30,826,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	30,826,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	30,826,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,334,000
Real Estate And Accumulated Depreciation Year Of Construction	1932
Real Estate And Accumulated Depreciation Year Of Acquisition	2012
New York Office 677 To 679 Madison Avenue [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	13,070,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,640,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	388,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,070,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	10,028,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	23,098,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,145,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
New York Office 484 To 486 Broadway [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	10,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,688,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	5,040,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	10,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	11,728,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	21,728,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,746,000
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 1135 Third Avenue [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	7,844,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,844,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	5,197,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	7,844,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,041,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	20,885,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	363,000
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office 431 7th Avenue [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	16,700,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,751,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	16,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,751,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	19,451,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	533,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 304-306 Canal Street [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	3,511,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	12,905,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,511,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	12,905,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	16,416,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2014
New York Office 334 Canal Street [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	1,693,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,507,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	7,107,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,693,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,614,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	15,307,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2011
New York Office 267 West 34th Street [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	5,099,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	10,037,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	5,099,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	10,037,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	15,136,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	295,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
New York Office 1540 Broadway Garage [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	4,086,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	8,914,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,086,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,914,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	13,000,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,912,000
Real Estate And Accumulated Depreciation Year Of Construction	1990
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
New York Office 966 Third Avenue [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	8,869,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	3,631,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,869,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,631,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	12,500,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	121,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2013
New York Office 148 Spring Street [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	3,200,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	8,112,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	392,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,504,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,704,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,396,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2008
New York Office 150 Spring Street [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	3,200,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,822,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	266,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	6,088,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,288,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,016,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2008
New York Office 488 8th Avenue [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	10,650,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,767,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-4,674,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,859,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	884,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,743,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	156,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Office 484 8th Avenue [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	3,856,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	762,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	383,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,856,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,145,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,001,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	345,000
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office 825 7th Avenue [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	1,483,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	697,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	33,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,483,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	730,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,213,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	322,000
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Office Other Including Signage [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	5,548,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	88,732,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	94,280,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	94,280,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	13,659,000
New York Office Total [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	4,474,039,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,345,852,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,227,329,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,860,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,438,752,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	6,994,429,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,433,181,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,591,723,000
New York NJ Paramus [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	27,521,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,033,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,488,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	27,521,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	16,868,000
Real Estate And Accumulated Depreciation Year Of Construction	1967
Real Estate And Accumulated Depreciation Year Of Acquisition	1987
New York Other Properties Hotel Pennsylvania [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	29,903,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	121,712,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	81,199,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	29,903,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	202,911,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	232,814,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	85,990,000
Real Estate And Accumulated Depreciation Year Of Construction	1919
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
New York Total [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	4,474,039,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,375,755,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,349,041,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,968,720,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,469,688,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,223,828,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,693,516,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,694,581,000
Washington DC Office 2011-2451 Crystal Drive [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	223,652,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	100,935,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	409,920,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	138,116,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	100,229,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	548,742,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	648,971,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	196,953,000
Real Estate And Accumulated Depreciation Year Of Construction	1984-1989
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 2001 Jefferson Davis Highway 2100 2200 Crystal Drive 223 23rd Street 2221 South Clark Street Crystal City Shops At 2100 And 220 20th Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	71,256,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	57,213,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	131,206,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	180,729,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	49,683,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	319,465,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	369,148,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	71,562,000
Real Estate And Accumulated Depreciation Year Of Construction	1964-1969
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1550-1750 Crystal Drive/ 241-251 18th Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	40,865,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	64,817,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	218,330,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	78,232,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	64,652,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	296,727,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	361,379,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	99,573,000
Real Estate And Accumulated Depreciation Year Of Construction	1974-1980
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office River House Apartments [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	259,546,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	118,421,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	125,078,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	69,507,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	138,819,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	174,187,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	313,006,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	35,074,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office Skyline Place [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	456,421,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	41,986,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	221,869,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	29,537,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	41,862,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	251,530,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	293,392,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	84,826,000
Real Estate And Accumulated Depreciation Year Of Construction	1973-1984
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1215, 1225 S. Clark Street/ 200, 201 12th Street S. [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	58,829,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	47,594,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	177,373,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	44,496,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	47,465,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	221,998,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	269,463,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	72,395,000
Real Estate And Accumulated Depreciation Year Of Construction	1983-1987
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1229-1231 25th Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	101,671,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	67,049,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,039,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	106,659,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	68,198,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	110,549,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	178,747,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	14,439,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office Warehouses [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	106,946,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,326,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	67,761,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	82,898,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	93,135,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	176,033,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,321,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office 2101 L Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	148,922,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	32,815,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	51,642,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	83,554,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	39,768,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	128,243,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	168,011,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	30,848,000
Real Estate And Accumulated Depreciation Year Of Construction	1975
Real Estate And Accumulated Depreciation Year Of Acquisition	2003
Washington DC Office 2200-2300 Clarendon Blvd [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	35,132,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	105,475,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	45,831,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	151,306,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	151,306,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	50,525,000
Real Estate And Accumulated Depreciation Year Of Construction	1988-1989
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1800, 1851 And 1901 South Bell Street [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	37,551,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	118,806,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-7,053,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	37,551,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	111,753,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	149,304,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	31,493,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office Bowen Building 875 15th Street NW [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	115,022,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	30,077,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	98,962,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,962,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	30,176,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	100,825,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	131,001,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	24,031,000
Real Estate And Accumulated Depreciation Year Of Construction	2004
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Washington DC Office 1875 Connecticut Avenue NW [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	92,500,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	36,303,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	82,004,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	7,269,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	35,886,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	89,690,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	125,576,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	20,162,000
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office One Skyline Tower [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	138,938,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	12,266,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	75,343,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	36,416,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	12,231,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	111,794,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	124,025,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	38,697,000
Real Estate And Accumulated Depreciation Year Of Construction	1988
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1399 New York Avenue North West [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	33,481,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	67,363,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	5,736,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	34,178,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	72,402,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	106,580,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	7,425,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2011
Washington DC Office Commerce Executive [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	13,401,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	58,705,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	20,283,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	13,140,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	79,249,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	92,389,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	25,710,000
Real Estate And Accumulated Depreciation Year Of Construction	1985-1989
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office Seven Skyline Place [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	103,971,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	10,292,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	58,351,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	23,086,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	10,262,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	81,467,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	91,729,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	18,906,000
Real Estate And Accumulated Depreciation Year Of Construction	2001
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1825 Connecticut Avenue NW [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	92,500,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	33,090,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	61,316,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-4,958,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	32,726,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	56,722,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	89,448,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	13,335,000
Real Estate And Accumulated Depreciation Year Of Construction	1956
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office 1235 Clark Street [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	15,826,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	53,894,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	18,636,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	15,826,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	72,530,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	88,356,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	22,186,000
Real Estate And Accumulated Depreciation Year Of Construction	1981
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office H Street North 10 1 D Land Parcel [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	104,473,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	55,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-33,488,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	61,970,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,070,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	71,040,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office 1750 Pennsylvania Avenue [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	20,020,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	30,032,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	15,094,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	21,170,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	43,976,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	65,146,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	11,250,000
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office Crystal City Hotel [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	8,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	47,191,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	9,316,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	8,000,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	56,507,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	64,507,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	14,565,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
Washington DC Office 1150 17th Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	28,728,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	23,359,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	24,876,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	15,224,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	24,723,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	38,736,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	63,459,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	14,992,000
Real Estate And Accumulated Depreciation Year Of Construction	1970
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1730 M Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	14,853,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	10,095,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	17,541,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	9,895,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	10,687,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,844,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	37,531,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	10,198,000
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office Democracy Plaza I [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	33,628,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,321,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	36,949,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	36,949,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	16,407,000
Real Estate And Accumulated Depreciation Year Of Construction	1987
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Washington DC Office 1726 M Street [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	9,450,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	22,062,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,433,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	9,455,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	25,490,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	34,945,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,036,000
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Washington DC Office Crystal Drive Retail [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	20,465,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	6,771,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	27,236,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	27,236,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	10,325,000
Real Estate And Accumulated Depreciation Year Of Construction	2004
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
Washington DC Office 1109 South Capitol Street [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	11,541,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	178,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-253,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	11,597,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	-131,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,466,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Washington DC Office South Capitol [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	4,009,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,273,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-1,741,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,541,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	8,541,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Washington DC Office H-Street [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	1,763,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	641,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	41,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,763,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	682,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,445,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	161,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Washington DC Other [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	51,767,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-37,673,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	14,094,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	14,094,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	156,000
Washington DC Office Total [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	1,982,806,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,052,773,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,376,711,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	935,739,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,004,915,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,360,308,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,365,223,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	943,551,000
Retail CA Walnut Creek (1149 S. Main Street) [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	2,699,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	19,930,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,699,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	19,930,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	22,629,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,599,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail CA Signal Hill [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	9,652,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,940,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	9,653,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,941,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	12,594,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	607,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail CA Walnut Creek (1556 Mount Diablo Blvd) [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	5,909,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,536,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	5,908,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,537,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,445,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	129,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail CA Vallejo [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	2,945,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	221,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,166,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,166,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	654,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail CA Total California [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	18,260,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	25,815,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,759,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	18,260,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	27,574,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	45,834,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,989,000
Retail CT Waterbury [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	13,643,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	667,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	4,504,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,666,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	667,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,170,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,837,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,077,000
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1969
Retail CT Newington [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	10,969,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,421,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,200,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,193,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,421,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,393,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,814,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	801,000
Real Estate And Accumulated Depreciation Year Of Construction	1965
Real Estate And Accumulated Depreciation Year Of Acquisition	1965
Retail CT Total Connecticut [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	24,612,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,088,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,704,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	5,859,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,088,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	11,563,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	14,651,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,878,000
Retail MD Rockville [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	3,470,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	20,599,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	810,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,470,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	21,409,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	24,879,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,106,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail MD Baltimore (Towson) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	15,248,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	581,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	3,227,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	10,498,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	581,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,725,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	14,306,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,741,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1968
Retail MD Annapolis [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	9,652,000
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	9,652,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,652,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,956,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail MD Wheaton [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	5,367,000
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	5,367,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,367,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,107,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail MD Glen Burnie [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	462,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,571,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,807,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	462,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	4,378,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,840,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,088,000
Real Estate And Accumulated Depreciation Year Of Construction	1958
Real Estate And Accumulated Depreciation Year Of Acquisition	1958
Retail MD Total Maryland [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	15,248,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	4,513,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	41,416,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	13,115,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,513,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	54,531,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	59,044,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	17,998,000
Retail MA Springfield [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,591,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,797,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,471,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	591,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,797,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,062,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,859,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,111,000
Real Estate And Accumulated Depreciation Year Of Construction	1993
Real Estate And Accumulated Depreciation Year Of Acquisition	1966
Retail MA Chicopee [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	8,106,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	895,000
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	895,000
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	895,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1969
Retail MA Cambridge [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	260,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	260,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	260,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	176,000
Retail MA Total Massachusetts [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	13,697,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,692,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,471,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	851,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,692,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,322,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,014,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,287,000
Retail NH Salem [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	6,083,000
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	6,083,000
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	6,083,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail Bergen Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	300,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	19,884,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	81,723,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	376,240,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	37,635,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	440,212,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	477,847,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	82,904,000
Real Estate And Accumulated Depreciation Year Of Construction	1957/2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2003
Retail NJ East Hanover I and II [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	41,786,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,232,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	18,241,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	12,033,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,671,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	29,835,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	32,506,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	15,472,000
Real Estate And Accumulated Depreciation Year Of Construction	1962
Real Estate And Accumulated Depreciation Year Of Acquisition	1962/1998
Retail NJ Totowa [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	24,183,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	120,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	11,994,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,653,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	92,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	16,675,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	16,767,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	12,839,000
Real Estate And Accumulated Depreciation Year Of Construction	1957/1999
Real Estate And Accumulated Depreciation Year Of Acquisition	1957
Retail NJ Bricktown [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	31,192,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,391,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	11,179,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	6,317,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,391,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	17,496,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	18,887,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	12,300,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1968
Retail NJ Hackensack [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	39,592,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	692,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	10,219,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,284,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	692,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,503,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	14,195,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	9,657,000
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	1963
Retail NJ North Bergen (Tonnelle Ave) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	75,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	24,493,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	63,717,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	31,806,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	56,404,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	88,210,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	9,486,000
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail NJ East Brunswick II (339-341 Route 18 S.) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	11,503,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,098,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	10,949,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,056,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,098,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	15,005,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	17,103,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	9,184,000
Real Estate And Accumulated Depreciation Year Of Construction	1972
Real Estate And Accumulated Depreciation Year Of Acquisition	1972
Retail NJ Union (Springfield Avenue) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	27,822,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	19,700,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	45,090,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	19,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	45,090,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	64,790,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	8,548,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NJ Marlton [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	16,853,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,611,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	3,464,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	9,960,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,454,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,581,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	15,035,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	8,538,000
Real Estate And Accumulated Depreciation Year Of Construction	1973
Real Estate And Accumulated Depreciation Year Of Acquisition	1973
Retail NJ Manalapan [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	20,545,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	725,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,189,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	5,534,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,046,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	12,402,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	13,448,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	8,177,000
Real Estate And Accumulated Depreciation Year Of Construction	1971
Real Estate And Accumulated Depreciation Year Of Acquisition	1971
Retail NJ Garfield [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	45,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	8,068,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	25,707,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	45,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	33,775,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	33,820,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,962,000
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
Retail NJ Morris Plains [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	20,866,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,104,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,411,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,101,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,104,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,512,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	8,616,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,934,000
Real Estate And Accumulated Depreciation Year Of Construction	1961
Real Estate And Accumulated Depreciation Year Of Acquisition	1985
Retail NJ East Brunswick I (325-333 Route 18 S.) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	24,290,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	319,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,220,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,959,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	319,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,179,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	8,498,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,725,000
Real Estate And Accumulated Depreciation Year Of Construction	1957
Real Estate And Accumulated Depreciation Year Of Acquisition	1957
Retail NJ Dover [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	12,841,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	559,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,363,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,598,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	559,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,961,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	10,520,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,628,000
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	1964
Retail NJ Middeltown [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	16,960,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	283,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,248,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,450,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	283,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,698,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,981,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,669,000
Real Estate And Accumulated Depreciation Year Of Construction	1963
Real Estate And Accumulated Depreciation Year Of Acquisition	1963
Retail NJ Wayne Towne Center [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	26,137,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	22,842,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	48,979,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	48,979,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,575,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2010
Retail NJ East Rutherford [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	13,269,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	36,727,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	60,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	36,787,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	36,787,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,284,000
Real Estate And Accumulated Depreciation Year Of Construction	2007
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NJ Union (Route 22 and Morris Ave) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	31,567,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,025,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,470,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,394,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,025,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	10,864,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	13,889,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,275,000
Real Estate And Accumulated Depreciation Year Of Construction	1962
Real Estate And Accumulated Depreciation Year Of Acquisition	1962
Retail NJ Lawnside [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	10,433,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	851,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	3,164,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,351,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	851,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	4,515,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,366,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,313,000
Real Estate And Accumulated Depreciation Year Of Construction	1969
Real Estate And Accumulated Depreciation Year Of Acquisition	1969
Retail NJ Watchung [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	14,713,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	4,178,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,463,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,711,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,441,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	6,911,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,352,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,240,000
Real Estate And Accumulated Depreciation Year Of Construction	1994
Real Estate And Accumulated Depreciation Year Of Acquisition	1959
Retail NJ Cherry Hill [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	13,536,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	5,864,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,694,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,177,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,864,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,871,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	12,735,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,985,000
Real Estate And Accumulated Depreciation Year Of Construction	1964
Real Estate And Accumulated Depreciation Year Of Acquisition	1964
Retail NJ Kearny [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	309,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	3,376,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,489,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	309,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	4,865,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,174,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,667,000
Real Estate And Accumulated Depreciation Year Of Construction	1938
Real Estate And Accumulated Depreciation Year Of Acquisition	1959
Retail NJ Lodi (Route 17 N.) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	11,075,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	238,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,446,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	238,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,446,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,684,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,599,000
Real Estate And Accumulated Depreciation Year Of Construction	1999
Real Estate And Accumulated Depreciation Year Of Acquisition	1975
Retail NJ Lodi (Washington Street) [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	7,606,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	13,125,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,596,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	7,606,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	15,721,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	23,327,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,494,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
Retail NJ North Plainfield [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	6,577,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	13,983,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-5,507,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,577,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,476,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	15,053,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,999,000
Real Estate And Accumulated Depreciation Year Of Construction	1955
Real Estate And Accumulated Depreciation Year Of Acquisition	1989
Retail NJ Carlstadt [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	16,457,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	16,458,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	16,458,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,959,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NJ Jersey City [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	19,796,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	652,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,495,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	468,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	652,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,963,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	8,615,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,799,000
Real Estate And Accumulated Depreciation Year Of Construction	1965
Real Estate And Accumulated Depreciation Year Of Acquisition	1965
Retail NJ Woodbridge [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	20,171,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,509,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,675,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,969,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,539,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	4,614,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	6,153,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,636,000
Real Estate And Accumulated Depreciation Year Of Construction	1959
Real Estate And Accumulated Depreciation Year Of Acquisition	1959
Retail NJ South Plainfield [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,003,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	0
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	10,044,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,582,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	11,626,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,626,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,221,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NJ Turnersville [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	900,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,342,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,094,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	900,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,436,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,336,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,194,000
Real Estate And Accumulated Depreciation Year Of Construction	1974
Real Estate And Accumulated Depreciation Year Of Acquisition	1974
Retail NJ Hazlet [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	7,400,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	9,413,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	7,400,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,413,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	16,813,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,784,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NJ Eatontown [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	4,653,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	4,999,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	326,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,653,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	5,325,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,978,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,371,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail NJ Montclair [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	2,568,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	66,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	419,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	381,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	66,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	800,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	866,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	694,000
Real Estate And Accumulated Depreciation Year Of Construction	1972
Real Estate And Accumulated Depreciation Year Of Acquisition	1972
Retail NJ Englewood [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	11,571,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,300,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	17,245,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-8,390,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,495,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	9,660,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,155,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	566,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NJ North Bergen (Kennedy Blvd) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	4,976,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,308,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	636,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	13,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,308,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	649,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,957,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	447,000
Real Estate And Accumulated Depreciation Year Of Construction	1993
Real Estate And Accumulated Depreciation Year Of Acquisition	1959
Retail NJ Total New Jersey [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	822,111,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	123,692,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	424,668,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	550,166,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	147,819,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	950,707,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	1,098,526,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	270,125,000
Retail NY Bronx (Bruckner Blvd) [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	66,100,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	259,503,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-63,515,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	61,618,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	200,470,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	262,088,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,160,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NY Huntington [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	16,265,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	21,200,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	33,667,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,690,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	21,200,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	35,357,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	56,557,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,173,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NY Mount Kisco [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	27,733,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	22,700,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	26,700,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	784,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	23,297,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	26,887,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	50,184,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,653,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NY Bronx (1750 - 1780 Gun Hill Road) [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	6,427,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	11,885,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	19,159,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,428,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	31,043,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	37,471,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,028,000
Real Estate And Accumulated Depreciation Year Of Construction	2009
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail NY Staten Island [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	17,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	11,446,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	21,262,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,725,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	11,446,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	23,987,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	35,433,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,075,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
Retail NY Inwood [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	12,419,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	19,097,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	795,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	12,419,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	19,892,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	32,311,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,974,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2004
Retail NY Buffalo (Amherst) [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	5,743,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	4,056,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	13,008,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	5,107,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	17,700,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	22,807,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	6,306,000
Real Estate And Accumulated Depreciation Year Of Construction	1968
Real Estate And Accumulated Depreciation Year Of Acquisition	1968
Retail NY West Babylon [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	6,720,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	13,786,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	201,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,720,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	13,987,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	20,707,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,700,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NY Freeport (437 E. Sunrise Highway) [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	20,866,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	1,231,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	4,747,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	3,091,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,231,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	7,838,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	9,069,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,343,000
Real Estate And Accumulated Depreciation Year Of Construction	1981
Real Estate And Accumulated Depreciation Year Of Acquisition	1981
Retail NY Dewitt [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	7,116,000
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	7,116,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,116,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,453,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail NY Oceanside [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	2,710,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,306,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	0
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,710,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,306,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,016,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	437,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail NY Rochester (Henrietta) [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	2,647,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,149,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,796,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,796,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,324,000
Real Estate And Accumulated Depreciation Year Of Construction	1971
Real Estate And Accumulated Depreciation Year Of Acquisition	1971
Retail NY Rochester [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	4,280,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,172,000
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	2,172,000
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	2,172,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Construction	1966
Real Estate And Accumulated Depreciation Year Of Acquisition	1966
Retail NY Freeport (240 Sunrise Highway) [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	260,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	260,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	260,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	151,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail NY Commack [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	43,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	184,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	227,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	227,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	123,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail NY New Hyde Park [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	4,000
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	4,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	126,000
Real Estate And Accumulated Depreciation Year Of Construction	1970
Real Estate And Accumulated Depreciation Year Of Acquisition	1976
Retail NY Total New York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	86,144,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	158,868,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	406,819,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-20,469,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	154,348,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	390,870,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	545,218,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	53,026,000
Retail PA Wilkes Barre [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	6,053,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	26,646,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	794,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	6,053,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	27,440,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	33,493,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	4,931,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
Retail PA Allentown [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	29,266,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	187,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	15,580,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,933,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	187,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	17,513,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	17,700,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	13,818,000
Real Estate And Accumulated Depreciation Year Of Construction	1957
Real Estate And Accumulated Depreciation Year Of Acquisition	1957
Retail PA Bensalem [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	14,526,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	2,727,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	6,698,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,895,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	2,727,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	8,593,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	11,320,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,689,000
Real Estate And Accumulated Depreciation Year Of Construction	1972/1999
Real Estate And Accumulated Depreciation Year Of Acquisition	1972
Retail PA Bethlehem [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,457,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	827,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	5,200,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,334,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	839,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	6,522,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	7,361,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	5,593,000
Real Estate And Accumulated Depreciation Year Of Construction	1966
Real Estate And Accumulated Depreciation Year Of Acquisition	1966
Retail PA Wyomissing [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	2,646,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	2,381,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	5,027,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	5,027,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,471,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail PA Broomall [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	10,433,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	850,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,171,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,680,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	850,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,851,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,701,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,792,000
Real Estate And Accumulated Depreciation Year Of Construction	1966
Real Estate And Accumulated Depreciation Year Of Acquisition	1966
Retail PA York [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,083,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	409,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	2,568,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	1,395,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	409,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,963,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,372,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,566,000
Real Estate And Accumulated Depreciation Year Of Construction	1970
Real Estate And Accumulated Depreciation Year Of Acquisition	1970
Retail PA Lancaster [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	5,270,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	3,140,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	63,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	689,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	3,140,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	752,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,892,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	518,000
Real Estate And Accumulated Depreciation Year Of Construction	1966
Real Estate And Accumulated Depreciation Year Of Acquisition	1966
Retail PA Glenolden [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	6,688,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	850,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,820,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	613,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	850,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	2,433,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,283,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,101,000
Real Estate And Accumulated Depreciation Year Of Construction	1975
Real Estate And Accumulated Depreciation Year Of Acquisition	1975
Retail PA Springfield [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	80,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	80,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	80,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	80,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail PA Total Pennsylvania [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	76,723,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	15,043,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	63,392,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	12,794,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	15,055,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	76,174,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	91,229,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	40,559,000
Retail SC Charleston [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	3,634,000
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	3,634,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,634,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	750,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Retail VA Norfolk [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	3,927,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	15,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	3,942,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	3,942,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	2,885,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Retail Las Catalinas Mall [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	130,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	15,280,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	64,370,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	10,121,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	15,280,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	74,491,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	89,771,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	30,478,000
Real Estate And Accumulated Depreciation Year Of Construction	1996
Real Estate And Accumulated Depreciation Year Of Acquisition	2002
Retail Montehiedra Town Center [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	120,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	9,182,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	66,751,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	8,328,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	9,267,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	74,994,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	84,261,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	31,673,000
Real Estate And Accumulated Depreciation Year Of Construction	1996
Real Estate And Accumulated Depreciation Year Of Acquisition	1997
Retail PR Total Puerto Rico [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	250,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	24,462,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	131,121,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	18,449,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	24,547,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	149,485,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	174,032,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	62,151,000
Retail Other [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	4,232,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	4,232,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	4,232,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	591,000
Retail Total Retail Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	1,288,535,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	357,701,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,108,967,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	586,771,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	377,405,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,676,034,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,053,439,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	462,239,000
Merchandise Mart IL Chicago [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	550,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	64,528,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	319,146,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	274,921,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	64,535,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	594,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	658,595,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	211,332,000
Real Estate And Accumulated Depreciation Year Of Construction	1930
Real Estate And Accumulated Depreciation Year Of Acquisition	1998
Merchandise Mart IL 527 W. Kinzie, Chicago [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	5,166,000
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	5,166,000
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	5,166,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Merchandise Mart IL Total [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	550,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	69,694,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	319,146,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	274,921,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	69,701,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	594,060,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	663,761,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	211,332,000
Merchandise Mart NY MMPI Piers [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	12,794,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	12,794,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	12,794,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	1,020,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2008
Merchandise Mart Total Merchandise Mart [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	550,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	69,694,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	319,146,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	287,715,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	69,701,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	606,854,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	676,555,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	212,352,000
Warehouse/Industrial NJ East Hanover [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	576,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,752,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	19,730,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	691,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	27,367,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	28,058,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	14,259,000
Real Estate And Accumulated Depreciation Year Of Construction	1972
Real Estate And Accumulated Depreciation Year Of Acquisition	1972
Other Properties 555 California Street [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	597,868,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	221,903,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	893,324,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	75,383,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	221,903,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	968,707,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	1,190,610,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	197,170,000
Real Estate And Accumulated Depreciation Year Of Construction	1922/1969/1970
Real Estate And Accumulated Depreciation Year Of Acquisition	2007
New York Manhattan 220 Central Park South Site [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	600,000,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	115,720,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	16,420,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	460,941,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	593,081,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	593,081,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Other Properties Atlantic City NJ [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	58,452,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	83,089,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	7,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-6,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	83,090,000
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	83,090,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	0
Real Estate And Accumulated Depreciation Year Of Acquisition	2010
Other Properties 40 East 66th Residential [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	29,199,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	85,798,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-86,696,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	10,990,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	17,311,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	28,301,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,686,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2005
Other Properties 677-679 Madison [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	1,462,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	1,058,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	284,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	1,626,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,178,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	2,804,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	322,000
Real Estate And Accumulated Depreciation Year Of Acquisition	2006
Other Properties Total Other Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	1,256,320,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	479,425,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	996,607,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	421,975,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	317,609,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	1,580,398,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	1,898,007,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	201,178,000
Leasehold Improvements Equipment and Other [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	130,594,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	130,594,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	130,594,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	100,975,000
Total December 31, 2014 [Member]
Real Estate And Accumulated Depreciation [Line Items]
Real Estate And Accumulated Depreciation Amount Of Encumbrances	9,551,700,000
Real Estate And Accumulated Depreciation Initial Cost Of Land	4,335,924,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	10,158,224,000
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	4,351,244,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	4,240,009,000
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	14,605,383,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	18,845,392,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	3,629,135,000
Other Properties Wasserman [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	28,052,000
Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements	0
Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements	-27,931,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land	0
Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements	121,000
Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements	121,000
Real Estate And Accumulated Depreciation Accumulated Depreciation	$0
Real Estate And Accumulated Depreciation Year Of Acquisition	2005

SEC_Schedule_III_Rollforward_o

SEC Schedule III Rollforward of Real Estate Assets and Accumulated Depreciation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Real estate, Balance at beginning period	$17,418,946	$17,365,533	$15,444,754
Gross real estate balance at year end	18,992,635	18,512,055	17,574,781
Less: Assets sold and written-off	147,243	1,093,109	209,248
Real estate, Balance at end of period	18,845,392	17,418,946	17,365,533
Reconciliation Of Real Estate Accumulated Depreciation Roll Forward
Accumulated Depreciation, Balance at beginning of period	3,296,717	2,966,067	2,742,244
Additions charged to operating expenses	461,689	423,844	427,189
Real Estate Accumulated Depreciation	3,758,406	3,389,911	3,169,433
Less: Accumulated depreciation on assets sold and written-off	129,271	93,194	203,366
Accumulated Depreciation, Balance at end of period	3,629,135	3,296,717	2,966,067
Land [Member]
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Additions during the period: Land	225,536	131,646	514,950
Building Improvements [Member]
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Additions during the period: Buildings & improvements	$1,348,153	$1,014,876	$1,615,077