UDR (UDR) 10-K 23 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2015	Feb. 22, 2016
Entity Information [Line Items]
Entity Registrant Name	UDR, Inc.
Entity Central Index Key	74,208
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float	$ 3.7
Entity Common Stock, Shares Outstanding		262,132,787
United Dominion Reality L.P.
Entity Information [Line Items]
Entity Registrant Name	United Dominion Realty L.P.
Entity Central Index Key	1,018,254
Document Period End Date	Dec. 31, 2015
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real estate owned:
Real estate held for investment	$ 9,053,599	$ 8,205,627
Less: accumulated depreciation	(2,646,044)	(2,434,772)
Real estate held for investment, net	6,407,555	5,770,855
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	124,072	177,632
Real estate held for disposition (net of accumulated depreciation of $830 and $0, respectively)	11,775	0
Total real estate owned, net of accumulated depreciation	6,543,402	5,948,487
Cash and cash equivalents	6,742	15,224
Restricted Cash	20,798	22,340
Notes receivable, net	16,694	14,369
Investment in and advances to unconsolidated joint ventures, net	938,906	718,226
Other assets	137,302	110,082
Total assets	7,663,844	6,828,728
Liabilities:
Secured debt, net	1,376,945	1,354,321
Unsecured debt, net	2,193,850	2,210,978
Real estate taxes payable	18,786	15,978
Accrued interest payable	29,162	34,215
Security deposits and prepaid rent	36,330	34,064
Distributions payable	80,368	69,460
Accounts payable, accrued expenses, and other liabilities	81,356	91,282
Total liabilities	3,816,797	3,810,298
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	946,436	282,480
Equity
Common stock, $0.01 par value; 350,000,000 shares authorized 261,844,521 and 255,114,603 shares issued and outstanding at December 31, 2015 and 2014, respectively	2,618	2,551
Additional paid-in capital	4,447,816	4,223,747
Distributions in excess of net income	(1,584,459)	(1,528,917)
Accumulated other comprehensive income/(loss), net	(12,678)	(8,855)
Total stockholders' equity	2,899,755	2,735,097
Non-controlling interest	856	853
Total equity	2,900,611	2,735,950
Total liabilities and equity	7,663,844	6,828,728
8.00% Series E Cumulative Convertible Preferred Stock
Equity
Preferred stock, no par value; 50,000,000 shares authorized	46,457	46,571
Series F Preferred Stock [Member]
Equity
Preferred stock, no par value; 50,000,000 shares authorized	$ 1	$ 0

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real estate owned:
Real estate under development, accumulated depreciation	$ 0	$ 0
Real estate held for sale, accumulated depreciation	$ 830	$ 0
Equity
Preferred stock, par or state value per share	$ 0	$ 0
Preferred stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares outstanding	261,844,521	255,114,603
8.00% Series E Cumulative Convertible Preferred Stock
Equity
Preferred stock, shares outstanding	2,796,903	2,803,812
Series F Preferred Stock [Member]
Equity
Preferred stock, par or state value per share	$ 0.0001
Preferred stock, shares authorized	20,000,000
Preferred stock, shares outstanding	16,452,496	2,464,183

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUES
Rental income	$ 871,928	$ 805,002	$ 746,484
Joint Venture Managment and Other Fees	22,710	13,044	12,442
Total revenues	894,638	818,046	758,926
Rental expenses:
Property operating and maintenance	155,096	149,428	144,319
Real estate taxes and insurance	102,963	99,175	93,765
Property management	23,978	22,138	20,528
Other operating expenses	9,708	8,271	7,136
Real estate depreciation and amortization	374,598	358,154	339,532
General and administrative	59,690	47,800	42,238
Casualty-related (recoveries)/charges, net	2,335	541	(12,253)
Other depreciation and amortization	6,679	5,775	6,741
Total operating expenses	735,047	691,282	642,006
Operating income	159,591	126,764	116,920
Income/(loss) from unconsolidated entities	62,329	(7,006)	(415)
Interest Expense	(121,875)	(130,454)	(126,083)
Interest income and other income/(expense), net	1,551	11,858	4,619
Income/(loss) before income taxes, discontinued operations and gain/(loss) on sale of real estate owned	101,596	1,162	(4,959)
Tax benefit/(provision), net	3,886	(25,994)	8,281
Income/(loss) from continuing operations	105,482	16,260	2,340
Income/(loss) from discontinued operations, net of tax	0	10	43,942
Income/(loss) before gain/(loss) on sale of real estate owned	105,482	16,270	46,282
Gain/(loss) on sales of real estate owned, net of tax	251,677	143,572	0
Net income/(loss)	357,159	159,842	46,282
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(16,773)	(5,511)	(1,530)
Net Income (Loss) Attributable to Noncontrolling Interest	3	(3)	(60)
Net income/(loss) attributable to Entity	340,383	154,334	44,812
Distributions to preferred stockholders	(3,722)	(3,724)	(3,724)
Net income/(loss) attributable to common stockholders	$ 336,661	$ 150,610	$ 41,088
Earnings per weighted average common share - basic and diluted:
Income/(loss) from continuing operations attributable to common stockholders	$ 1.30	$ 0.60	$ (0.01)
Income/(loss) from discontinued operations attributable to common stockholders	0	0	0.17
Net income/(loss) attributable to common stockholders	1.30	0.60	0.16
Income/(loss) from continuing operations attributable to common stockholders	1.29	0.59	(0.01)
Income/(loss) from discontinued operations attributable to common stockholders	0	0	0.17
Net income(loss) attributable to common stockholders	$ 1.29	$ 0.59	$ 0.16
Weighted average number of common shares outstanding — basic	258,669	251,528	249,969
Weighted average number of common shares outstanding — diluted	263,752	253,445	249,969
Continuing Operations [Member]
Rental expenses:
Tax benefit/(provision), net	$ 3,886	$ 15,098	$ 7,299

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income / (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income/(loss)	$ 357,159	$ 159,842	$ 46,282
Other comprehensive income/(loss) - derivative instruments:
Unrealized holding gain/(loss)	(6,393)	(8,695)	(469)
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)	2,262	4,834	6,851
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	(4,131)	(3,861)	6,382
Comprehensive income/(loss)	353,028	155,981	52,664
Comprehensive (income)/loss attributable to noncontrolling interests	(16,468)	(5,375)	(1,720)
Comprehensive income/(loss) attributable to Entity	$ 336,560	$ 150,606	$ 50,944

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Paid - in Capital	Distributions in Excess of Net Income	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest	Series E Preferred Stock [Member]	Series E Preferred Stock [Member]Preferred Stock	Series E Preferred Stock [Member]Paid - in Capital	Series F Preferred Stock [Member]	Series F Preferred Stock [Member]Preferred Stock
Beginning Balance, Shares at Dec. 31, 2012			250,139,408						2,803,812			2,464,183
Beginning Balance at Dec. 31, 2012	$ 2,993,832	$ 46,571	$ 2,501	$ 4,098,882	$ (1,143,781)	$ (11,257)	$ 916
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to Entity	44,812				44,812
Net income/(loss) attributable to non-controlling interests	(60)						(60)
Other comprehensive income/(loss)	6,132					6,132
Issuance/(forfeiture) of common and restricted shares, net	9,072		5	9,067
Issuance of common shares through public offering	0
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	1,817		$ 1	1,816
Common stock distributions declared	(235,721)				(235,721)	0
Preferred stock distributions declared-Series E	(3,724)				(3,724)	0
Adjustment to reflect redemption value of redeemable non-controlling interests	(3,656)				(3,656)	0
Ending Balance, Shares at Dec. 31, 2013			250,749,665						2,803,812			2,464,183
Ending Balance at Dec. 31, 2013	2,812,504	46,571	$ 2,507	4,109,765	(1,342,070)	(5,125)	856
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to Entity	154,334				154,334
Net income/(loss) attributable to non-controlling interests	(3)						(3)
Other comprehensive income/(loss)	(3,730)					(3,730)
Issuance/(forfeiture) of common and restricted shares, net	9,805		8	9,797
Issuance of common shares through public offering	99,849		34	99,815
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	4,372		$ 2	4,370
Common stock distributions declared	(263,503)				(263,503)	0
Preferred stock distributions declared-Series E	(3,724)				(3,724)	0
Adjustment to reflect redemption value of redeemable non-controlling interests	(73,954)				(73,954)	0
Ending Balance, Shares at Dec. 31, 2014			255,114,603						2,803,812			2,464,183
Ending Balance at Dec. 31, 2014	2,735,950	46,571	$ 2,551	4,223,747	(1,528,917)	(8,855)	853
Consolidated Statements of Changes in Equity
Net income/(loss) attributable to Entity	340,383						0
Net income/(loss) attributable to non-controlling interests	3					0	3
Other comprehensive income/(loss)	(3,823)		0	0		(3,823)
Issuance/(forfeiture) of common and restricted shares, net	10,194		3	10,191
Issuance of common shares through public offering	210,011	0	63	209,948	0						$ 1	$ 1
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	3,817		$ 1	3,816				$ 0	$ (114)	$ 114
Common stock distributions declared	(289,500)				289,500
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests							0
Preferred stock distributions declared-Series E	(3,722)				3,722
Adjustment to reflect redemption value of redeemable non-controlling interests	(102,703)				(102,703)
Ending Balance, Shares at Dec. 31, 2015			261,844,521						2,796,903			16,452,496
Ending Balance at Dec. 31, 2015	$ 2,900,611	$ 46,458	$ 2,618	$ 4,447,816	$ (1,584,459)	$ (12,678)	$ 856

Consolidated Statements of Cha7

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Common distributions declared per share	$ 1.11	$ 1.0400	$ 0.9400
Series E Preferred Stock [Member]
Preferred stock distributions declared	$ 1.3288	$ 1.3288	$ 1.3288

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income/(loss)	$ 357,159	$ 159,842	$ 46,282
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Deprecation and amortization	381,277	363,929	348,231
(Gain)/loss on the sale of real estate, net of tax	251,677	143,647	41,919
Impairment loss, net of tax	0	0	1,470
Tax benefit/(provision), net	(3,886)	(15,136)	(7,299)
(Income)/loss from unconsolidated entities	(62,329)	7,006	415
Amortization of share-based compensation	18,017	13,954	9,531
Other	6,612	13,104	15,025
Changes in operating assets and liabilities:
Increase/(decrease) in operating assets	(3,968)	(1,074)	(15,135)
Increase/(decrease) in operating liabilites	(9,590)	(5,618)	(16,699)
Net cash provided by operating activities	431,615	392,360	339,902
Investing Activities
Acquisition of real estate assets (net of liabilities assumed) and initial capital expenditures	(244,769)	(228,810)	0
Proceeds from sales of real estate investments, net	387,650	383,886	250,043
Development of real estate assets	(103,205)	(251,493)	(280,603)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	(113,400)	(96,679)	(153,676)
Capital expenditures - non-real estate assets	(4,049)	(5,497)	(7,639)
Investment in unconsolidated joint ventures	(217,642)	(222,930)	(43,291)
Distributions received from unconsolidated joint venture	59,291	59,199	130,984
(Issuance)/repayment of notes receivable	(2,325)	68,664	(19,027)
Net cash provided by/(used in) investing activities	(238,449)	(293,660)	(123,209)
Financing Activities
Payments on secured debt	(193,958)	(80,961)	(46,564)
Proceeds from the issuance of secured debt	127,600	5,502	0
Payments on unsecured debt	(325,540)	(312,500)	(122,500)
Proceeds from the issuance of unsecured debt	299,310	298,956	299,943
Net proceeds/(repayment) of revolving bank debt	(2,500)	152,500	(76,000)
Proceeds from the issuance of common shares through public offering, net	210,011	99,849	0
Distributions paid to non-controlling interests	(10,654)	(9,929)	(9,348)
Distributions paid to preferred stockholders	(3,722)	(3,724)	(3,724)
Distributions paid to common stockholders	(283,168)	(256,100)	(231,822)
Other	(19,027)	(7,318)	(8,544)
Net cash (used in)/provided by financing activities	(201,648)	(113,725)	(198,559)
Net increase/(decrease) in cash and cash equivalents	(8,482)	(15,025)	18,134
Cash and cash equivalents, beginning of period	15,224	30,249	12,115
Cash and cash equivalents, end of period	6,742	15,224	30,249
Supplemental Information:
Interest paid during the period, net of amounts capitalized	130,240	131,815	127,877
Non-cash transactions:
Acquisition of communities in exchange for DownREIT units and assumption of debt	660,832	0	0
Secured debt assumed in the acquisitions of properties, including asset exchange	0	0	63,595
Fair Value Adjustment of Debt Assumed in Business Acquisition	1,363	0	0
Real estate acquired in asset exchange or upon consolidation of joint ventures	0	0	129,437
Real Estate Owned, Transfer to Real Estate Owned	0	54,938	175,951
Development costs and capital expenditures incurred buy not yet paid	20,375	34,746	37,220
Conversion of operating partnership non-controlling interests to common stock (112,174 shares in 2015; 153,451 shares in 2014; and 76,291 shares in 2013) 2011)	3,817	4,372	1,817
Unconsolidated Joint Venture Vitruvian Park [Member]
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
(Income)/loss from unconsolidated entities	3,711	4,068	2,851
1745 Shea [Member]
Non-cash transactions:
Secured debt assumed in the acquisitions of properties, including asset exchange	$ 24,067	$ 0	$ 0

Consolidated Statements of Cas9

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Non-cash transactions:
Number of shares of common stock converted from operating partnership non-controlling interests	112,174	153,451	76,291

Consolidated Balance Sheets (UN

Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real estate owned:
Real estate held for investment	$ 9,053,599	$ 8,205,627
Less: accumulated depreciation	(2,646,044)	(2,434,772)
Total real estate owned, net of accumulated depreciation	6,543,402	5,948,487
Cash and cash equivalents	6,742	15,224
Investment in unconsolidated entities	938,906	718,226
Other assets	137,302	110,082
Total assets	7,663,844	6,828,728
LIABILITIES AND CAPITAL
Secured debt, net	1,376,945	1,354,321
Real estate taxes payable	18,786	15,978
Accrued interest payable	29,162	34,215
Distributions payable	80,368	69,460
Deferred gains on the sale of depreciable property	6,800	24,700
Accounts payable, accrued expenses, and other liabilities	81,356	91,282
Total liabilities	3,816,797	3,810,298
Partners' Capital:
Accumulated other comprehensive loss	(12,678)	(8,855)
Total liabilities and equity	7,663,844	6,828,728
United Dominion Reality L.P.
Real estate owned:
Real estate held for investment	3,630,905	4,238,770
Less: accumulated depreciation	(1,281,258)	(1,403,303)
Total real estate owned, net of accumulated depreciation	2,349,647	2,835,467
Cash and cash equivalents	3,103	502
Restricted cash	11,344	13,811
Investment in unconsolidated entities	166,186	0
Other assets	24,528	24,029
Total assets	2,554,808	2,873,809
LIABILITIES AND CAPITAL
Secured debt, net	475,964	927,484
Notes payable due to General Partner	273,334	88,696
Real estate taxes payable	2,775	7,061
Accrued interest payable	1,550	3,284
Security deposits and prepaid rent	15,929	18,387
Distributions payable	50,962	47,788
Deferred gains on the sale of depreciable property	0	24,622
Accounts payable, accrued expenses, and other liabilities	12,964	22,436
Total liabilities	833,478	1,139,758
Partners' Capital:
General partner: 110,883 OP units outstanding at December 31, 2015 and 2014	1,110	1,105
Limited partners: 183,167,815 OP Units outstanding at December 31, 2015 and 2014	1,712,415	1,702,971
Accumulated other comprehensive loss	(113)	(1,075)
Total partners' capital	1,713,412	1,703,001
Advances to/(from) General Partner	(11,270)	13,624
Non-controlling interest	19,188	17,426
Total capital	1,721,330	1,734,051
Total liabilities and equity	$ 2,554,808	$ 2,873,809

Consolidated Balance Sheets (11

Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) - shares	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Partners' Capital:
OP units outstanding related to limited partner	183,278,698	183,278,698	183,278,698	184,281,254
United Dominion Reality L.P.
Partners' Capital:
OP units outstanding related to general partner	110,883	110,883
OP units outstanding related to limited partner	183,167,815	183,167,815

Consolidated Statements of Op12

Consolidated Statements of Operations (UNITED DOMINION REALTY, L.P) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rental expenses:
Property operating and maintenance	$ 155,096	$ 149,428	$ 144,319
Real estate taxes and insurance	(102,963)	(99,175)	(93,765)
Property management	(23,978)	(22,138)	(20,528)
Other operating expenses	(9,708)	(8,271)	(7,136)
General and administrative	59,690	47,800	42,238
Casualty-related (recoveries)/charges, net	2,335	541	(12,253)
Total operating expenses	735,047	691,282	642,006
Operating income	159,591	126,764	116,920
Income/(loss) from unconsolidated entities	62,329	(7,006)	(415)
Income/(loss) from continuing operations	105,482	16,260	2,340
Income/(loss) from discontinued operations	0	10	43,942
Gain/(loss) on sales of real estate owned	251,677	143,572	0
Net income/(loss)	357,159	159,842	46,282
Net (income)/loss attributable to non-controlling interests	(16,468)	(5,375)	(1,720)
Net income/(loss) attributable to Entity	340,383	154,334	44,812
United Dominion Reality L.P.
REVENUES
Rental income	440,408	422,634	401,853
Rental expenses:
Property operating and maintenance	75,373	75,211	75,019
Real estate taxes and insurance	(47,438)	(47,110)	(45,139)
Property management	(12,111)	(11,622)	(11,051)
Other operating expenses	(5,923)	(5,172)	(5,728)
Real estate depreciation and amortization	(169,784)	(179,176)	(179,367)
General and administrative	27,016	28,541	24,808
Casualty-related (recoveries)/charges, net	843	541	(8,083)
Total operating expenses	338,488	347,373	333,029
Operating income	101,920	75,261	68,824
Income/(loss) from unconsolidated entities	(4,659)	0	0
Interest expense	(35,274)	(37,114)	(34,989)
Interest expense on note payable due to General Partner	(5,047)	(4,603)	(1,069)
Income/(loss) from continuing operations	56,940	33,544	32,766
Income/(loss) from discontinued operations	0	0	45,176
Income/(loss) before gain/(loss) on sale of real estate owned	56,940	33,544	77,942
Gain/(loss) on sales of real estate owned	158,123	63,635	0
Net income/(loss)	215,063	97,179	77,942
Net (income)/loss attributable to non-controlling interests	(1,762)	(952)	(4,566)
Net income/(loss) attributable to Entity	$ 213,301	$ 96,227	$ 73,376
Income/(loss) per OP unit- basic and diluted:
Net income/(loss) from continuing operations attributable to OP unitholders	$ 1.16	$ 0.53	$ 0.16
Net income/(loss) from discontinued operations attributable to OP unitholders	0	0	0.24
Net income/(loss) attributable to OP unitholders	$ 1.16	$ 0.53	$ 0.40
Weighted average OP units outstanding - basic and diluted	183,279	183,279	184,196

Consolidated Statements of Co13

Consolidated Statements of Comprehensive Income / (Loss) (UNITED DOMINION REALTY, L.P.) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income/(loss)	$ 357,159	$ 159,842	$ 46,282
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)	(6,393)	(8,695)	(469)
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	(4,131)	(3,861)	6,382
Comprehensive income/(loss)	353,028	155,981	52,664
Comprehensive (income)/loss attributable to noncontrolling interests	(16,468)	(5,375)	(1,720)
Comprehensive income/(loss) attributable to Entity	336,560	150,606	50,944
United Dominion Reality L.P.
Net income/(loss)	215,063	97,179	77,942
Other comprehensive income/(loss), including portion attributable to noncontrolling interests:
Unrealized holding gain/(loss)	(82)	(285)	(348)
(Gain)/loss reclassified into earnings from other comprehensive income/(loss)	1,044	2,275	2,652
Other comprehensive income/(loss), including portion attributable to noncontrolling interests	962	1,990	2,304
Comprehensive income/(loss)	216,025	99,169	80,246
Comprehensive (income)/loss attributable to noncontrolling interests	(1,762)	(952)	(4,566)
Comprehensive income/(loss) attributable to Entity	$ 214,263	$ 98,217	$ 75,680

Consolidated Statements of Ch14

Consolidated Statements of Changes in Capital (UNITED DOMINION REALTY, L.P) (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income (loss)	$ (4,131)	$ (3,861)	$ 6,382
United Dominion Reality L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	1,734,051	1,803,097	1,918,756
Net income (loss)	215,063	97,179	77,942
Distributions	(203,852)	(191,150)	(173,716)
OP Unit Redemptions for common shares of UDR	0
Distribution of community to UDR			(77,041)
Adjustment to reflect limited partners' capital at redemption value	0
Unrealized gain on derivative financial investments	962
Other comprehensive income (loss)	962	1,990	2,304
Net change in receivable due from General Partner	(24,894)	22,935	54,852
Balance	1,721,330	1,734,051	1,803,097
United Dominion Reality L.P. | Payable/(Receivable) due to/(from) General Partner [Member] [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	13,624	(9,916)	(11,056)
Distribution of community to UDR			(53,712)
Net change in receivable due from General Partner	(24,894)	23,540	54,852
Balance	(11,270)	13,624	(9,916)
United Dominion Reality L.P. | Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	(1,075)	(3,065)	(5,369)
Unrealized gain on derivative financial investments	962
Other comprehensive income (loss)		1,990	2,304
Balance	(113)	(1,075)	(3,065)
United Dominion Reality L.P. | Total Partner's Capital
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	1,703,001	1,795,934	1,917,299
Net income (loss)	213,301	96,227	73,376
Distributions	(203,852)	(191,150)	(173,716)
OP Unit Redemptions for common shares of UDR	0
Distribution of community to UDR	0	0	(23,329)
Adjustment to reflect limited partners' capital at redemption value	0
Unrealized gain on derivative financial investments	962
Other comprehensive income (loss)		1,990	2,304
Balance	1,713,412	1,703,001	1,795,934
United Dominion Reality L.P. | Noncontrolling Interest
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	17,426	17,079	12,513
Net income (loss)	1,762	952	4,566
Adjustment to reflect limited partners' capital at redemption value	0
Balance	19,188	17,426	17,079
United Dominion Reality L.P. | Class A Limited Partner
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	53,987	40,902	41,656
Net income (loss)	2,201	920	868
Distributions	(2,328)	(2,328)	(2,324)
OP Unit Redemptions for common shares of UDR	0
Adjustment to reflect limited partners' capital at redemption value	10,549	14,493	702
Balance	64,409	53,987	40,902
United Dominion Reality L.P. | Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	228,493	176,695	181,762
Net income (loss)	8,515	3,938	3,016
Distributions	(8,138)	(7,789)	(7,118)
OP Unit Redemptions for common shares of UDR	(3,816)	(4,371)	(1,817)
Adjustment to reflect limited partners' capital at redemption value	43,427	60,020	852
Balance	268,481	228,493	176,695
United Dominion Reality L.P. | Limited Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	1,420,491	1,580,239	1,698,027
Net income (loss)	202,456	91,311	69,448
Distributions	(193,262)	(180,917)	(164,170)
OP Unit Redemptions for common shares of UDR	3,816	4,371	1,817
Distribution of community to UDR			(23,329)
Adjustment to reflect limited partners' capital at redemption value	(53,976)	(74,513)	(1,554)
Balance	1,379,525	1,420,491	1,580,239
United Dominion Reality L.P. | General Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance	1,105	1,163	1,223
Net income (loss)	129	58	44
Distributions	(124)	(116)	(104)
Adjustment to reflect limited partners' capital at redemption value	0
Balance	$ 1,110	$ 1,105	$ 1,163

Consolidated Statements of Ca15

Consolidated Statements of Cash Flows (UNITED DOMINION REALTY, L.P) (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income/(loss)	$ 357,159	$ 159,842	$ 46,282
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	381,277	363,929	348,231
Gain/(loss) on sales of real estate owned	251,677	143,572	0
Income/(loss) from unconsolidated entities	(62,329)	7,006	415
Other	6,612	13,104	15,025
Changes in operating assets and liabilities:
Increase/(decrease) in operating assets	(3,968)	(1,074)	(15,135)
Increase/(decrease) in operating liabilites	(9,590)	(5,618)	(16,699)
Net cash provided by operating activities	431,615	392,360	339,902
Investing Activities
Acquisition of real estate assets	244,769	228,810	0
Development of real estate assets	(103,205)	(251,493)	(280,603)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	113,400	96,679	153,676
Net cash provided by/(used in) investing activities	(238,449)	(293,660)	(123,209)
Financing Activities
Proceeds from the issuance of secured debt	127,600	5,502	0
Payments on secured debt	(193,958)	(80,961)	(46,564)
Net cash (used in)/provided by financing activities	(201,648)	(113,725)	(198,559)
Net increase/(decrease) in cash and cash equivalents	(8,482)	(15,025)	18,134
Cash and cash equivalents, beginning of period	15,224	30,249	12,115
Cash and cash equivalents, end of period	6,742	15,224	30,249
Supplemental Information:
Interest paid during the period, net of amounts capitalized	130,240	131,815	127,877
Real Estate Investment Property, Net	6,407,555	5,770,855
Acquisition of investment in DownREIT Partnership	660,832	0	0
Secured debt, net	1,376,945	1,354,321
Deconsolidation of communitites contributed to DownREIT Partnership	0	54,938	175,951
United Dominion Reality L.P.
Operating Activities
Net income/(loss)	215,063	97,179	77,942
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Depreciation and amortization	169,784	179,176	181,302
Gain/(loss) on sales of real estate owned	158,123	63,635	0
Net gain on the sale of depreciable property	0	0	41,518
Income/(loss) from unconsolidated entities	4,659	0	0
Other	606	2,497	1,827
Changes in operating assets and liabilities:
Increase/(decrease) in operating assets	385	(1,756)	(11,685)
Increase/(decrease) in operating liabilites	(5,609)	(5,429)	478
Net cash provided by operating activities	226,765	208,032	208,346
Investing Activities
Acquisition of real estate assets	141,424	0	0
Proceeds from sales of real estate investments, net	232,728	47,922	79,437
Development of real estate assets	(6,280)	(47,220)	(66,407)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	61,441	47,352	76,984
Net cash provided by/(used in) investing activities	23,583	(46,650)	(63,954)
Financing Activities
Advances from General Partner, net	(232,764)	(153,751)	(92,537)
Proceeds from the issuance of secured debt	184,638	5,909	0
Payments on secured debt	(189,244)	(4,995)	(42,237)
Distributions paid to partnership unitholders	(10,367)	(9,929)	(9,348)
Payment of financing costs	(10)	(11)	(1,177)
Net cash (used in)/provided by financing activities	(247,747)	(162,777)	(145,299)
Net increase/(decrease) in cash and cash equivalents	2,601	(1,395)	(907)
Cash and cash equivalents, beginning of period	502	1,897	2,804
Cash and cash equivalents, end of period	3,103	502	1,897
Supplemental Information:
Interest paid during the period, net of amounts capitalized	44,881	44,629	42,506
Acquisition of investment in DownREIT Partnership	174,822	0	0
Secured debt, net	475,964	927,484
Deconsolidation of communitites contributed to DownREIT Partnership		0	0
Real estate distributed to the General Partner	0	0	74,586
OP Units redeemed by General Partner in partial consideration for real estate distributed			(77,041)
Reallocation of Credit Facilities Debt from General Partner	17,557	0	13,682
Development costs and capital expenditures Incurred but not yet paid	3,118	7,254	6,371
Partnership Capital [Member] | United Dominion Reality L.P.
Supplemental Information:
OP Units redeemed by General Partner in partial consideration for real estate distributed	0	0	(23,329)
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Gain/(loss) on sales of real estate owned	133,500
Financing Activities
Cash and cash equivalents, end of period	(140)
Supplemental Information:
Real Estate Investment Property, Net	(405,116)	$ 0	$ 0
Secured debt, net	$ (228,390)

Consolidation and Basis of Pres

Consolidation and Basis of Presentation	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
CONSOLIDATION AND BASIS OF PRESENTATION	CONSOLIDATION AND BASIS OF PRESENTATION Organization and Formation UDR, Inc. (“UDR,” the “Company,” “we,” or “our”) is a self-administered real estate investment trust, or REIT, that owns, operates, acquires, renovates, develops, redevelops, and manages apartment communities generally in high barrier-to-entry markets located in the United States. The high barrier-to-entry markets are characterized by limited land for new construction, difficult and lengthy entitlement process, expensive single-family home prices and significant employment growth potential. At December 31, 2015 , our consolidated apartment portfolio consisted of 133 consolidated communities located in 18 markets consisting of 40,728 apartment homes. In addition, the Company has an ownership interest in 6,696 apartment homes through unconsolidated joint ventures. Basis of Presentation The accompanying consolidated financial statements of UDR include its wholly-owned and/or controlled subsidiaries (see the “Consolidated Joint Ventures” section of Note 5, Joint Ventures and Partnerships , for further discussion). All significant intercompany accounts and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current financial statement presentation. The accompanying consolidated financial statements include the accounts of UDR and its subsidiaries, including United Dominion Realty, L.P. (the “Operating Partnership” or the “OP”) and UDR Lighthouse DownREIT L.P. (the “DownREIT Partnership”). As of December 31, 2015 and 2014 , there were 183,278,698 units in the Operating Partnership (“OP Units”) outstanding, of which 174,225,399 or 95.1% and 174,113,225 or 95.0% , respectively, were owned by UDR and 9,053,299 or 4.9% and 9,165,473 or 5.0% , respectively, were owned by outside limited partners. As of December 31, 2015 , there were 32,367,380 units in the DownREIT Partnership (“DownREIT Units”) outstanding, of which 16,229,407 or 50.1% were owned by UDR (of which, 13,470,651 or 41.6% were held by the Operating Partnership) and 16,137,973 or 49.9% were owned by outside limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating Partnership and DownREIT Partnership. The Company evaluated subsequent events through the date its financial statements were issued. No significant recognized or non-recognized subsequent events were noted other than those mentioned in Note 4, Real Estate Owned and Note 6, Secured and Unsecured Debt, Net .

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Recent Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , which incorporates a requirement that a disposition represent a strategic shift in an entity’s operations into the definition of a discontinued operation. In accordance with the ASU, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity. The standard requires prospective application and will be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. The early adoption provision excludes components of an entity that were sold or classified as held for sale prior to the adoption of the standard. The Company elected to early adopt this standard effective January 1, 2014, which had a significant impact on the Company’s consolidated financial statements as further discussed in Note 3, Discontinued Operations . Subsequent to the Company’s adoption of ASU 2014-08, the sale of real estate that does not meet the definition of a discontinued operation under the standard is included in Gain/(loss) on sale of real estate owned, net of tax on the Consolidated Statements of Operations. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method, and the standard will be effective for the Company on January 1, 2017; early adoption is not permitted. The Company has not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which makes changes to both the variable interest model and the voting model of consolidation. Under ASU 2015-02, companies will need to re-evaluate whether an entity meets the criteria to be considered a variable interest entity (“VIE”) or whether the consolidation of an entity should be assessed under the voting model. The new standard specifically eliminates the presumption in the current voting model that a general partner controls a limited partnership or similar entity unless that presumption can be overcome. The new standard will be effective for the Company beginning on January 1, 2016 and must be applied using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the period of adoption or retrospectively to each period presented. The Company does not expect the adoption of the new standard to result in the consolidation of entities not previously consolidated or the deconsolidation of any entities previously consolidated. Upon adopting the new standard, the Company expects that the Operating Partnership and DownREIT Partnership will become VIEs as the limited partners of both entities lack substantive kick-out rights and substantive participating rights. The Company expects to be the primary beneficiary of, and continue to consolidate, both entities. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. ASU 2015-03 did not directly address presentation or subsequent measurement of issuance costs related to line-of-credit arrangements. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , which clarifies that such costs may be presented as an asset and subsequently amortized over the term of the line-of-credit arrangement. The cumulative guidance, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. The Company elected to early adopt ASU 2015-03 and ASU 2015-15 during the fourth quarter of 2015. As a result, for all periods presented, deferred financing costs related to secured and unsecured debt are included as reductions to Secured debt, net and Unsecured debt, net , respectively, on the accompanying Consolidated Balance Sheets and deferred financing costs related to revolving credit facilities are included within Other assets on the accompanying Consolidated Balance Sheets. At December 31, 2015, $7.9 million , $5.5 million and $12.4 million of deferred financing costs were included within Other assets , Secured debt, net , and Unsecured debt, net , respectively. At December 31, 2014, the following amounts of deferred financing costs were reclassified ( in thousands ): Deferred financing costs Other assets Secured debt, net Unsecured Debt, net December 31, 2014 As previously presented $ 22,686 $ 105,202 $ 1,361,529 $ 2,221,576 Reclassification of deferred financing costs (22,686 ) 4,880 (7,208 ) (10,598 ) As presented herein $ — $ 110,082 $ 1,354,321 $ 2,210,978 In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments , which requires that the cumulative impact of a measurement-period adjustment, including impacts on prior periods, be recognized in the reporting period in which the adjustment amount is determined and, therefore, eliminates the requirement to retrospectively account for the adjustment in prior periods presented. The new standard will be effective for the Company beginning on January 1, 2016 and must be applied prospectively to measurement-period adjustments that occur after the effective date. The Company will comply with the new guidance upon adoption. Real Estate Real estate assets held for investment are carried at historical cost and consist of land, buildings and improvements, furniture, fixtures and equipment and other costs incurred during their development, acquisition and redevelopment. Expenditures for ordinary repair and maintenance costs are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to the acquisition and/or improvement of real estate assets are capitalized and depreciated over their estimated useful lives if the expenditures qualify as a betterment or the life of the related asset will be substantially extended beyond the original life expectancy. UDR purchases real estate investment properties and records the tangible and identifiable intangible assets and liabilities acquired based on their estimated fair value. The primary, although not only, identifiable intangible asset associated with our portfolio is the value of existing lease agreements. When recording the acquisition of a community, we first assign fair value to the estimated intangible value of the existing lease agreements and then to the estimated value of the land, building and fixtures assuming the community is vacant. The Company estimates the intangible value of the lease agreements by determining the lost revenue associated with a hypothetical lease-up. Depreciation on the building is based on the expected useful life of the asset and the in-place leases are amortized over their remaining average contractual life. Property acquisition costs are expensed as incurred. Quarterly or when changes in circumstances warrant, UDR will assess our real estate properties for indicators of impairment. In determining whether the Company has indicators of impairment in our real estate assets, we assess whether the long-lived asset’s carrying value exceeds the community’s undiscounted future cash flows, which is representative of projected net operating income (“NOI”) plus the residual value of the community. Our future cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. If such indicators of impairment are present and the carrying value exceeds the undiscounted cash flows of the community, an impairment loss is recognized equal to the excess of the carrying amount of the asset over its estimated fair value. Our estimates of fair market value represent our best estimate based primarily upon unobservable inputs related to rental rates, operating costs, growth rates, discount rates, capitalization rates, industry trends and reference to market rates and transactions. For long-lived assets to be disposed of, impairment losses are recognized when the fair value of the asset less estimated cost to sell is less than the carrying value of the asset. Properties classified as real estate held for sale generally represent properties that are actively marketed or contracted for sale with the closing expected to occur within the next twelve months. Real estate held for sale is carried at the lower of cost, net of accumulated depreciation, or fair value, less the cost to sell, determined on an asset-by-asset basis. Expenditures for ordinary repair and maintenance costs on held for sale properties are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to held for sale properties are capitalized at cost. Depreciation is not recorded on real estate held for sale. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets which are 35 to 55 years for buildings, 10 to 35 years for major improvements, and 3 to 10 years for furniture, fixtures, equipment, and other assets. Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation . The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, for the years ended December 31, 2015 , 2014 , and 2013 were $6.3 million , $9.0 million and $11.1 million , respectively. During the years ended December 31, 2015 , 2014 , and 2013 , total interest capitalized was $16.1 million , $20.2 million , and $29.4 million , respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life. Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, demand deposits with financial institutions and short-term, highly liquid investments. We consider all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The majority of the Company’s cash and cash equivalents are held at major commercial banks. Restricted Cash Restricted cash consists of escrow deposits held by lenders for real estate taxes, insurance and replacement reserves, and security deposits. Revenue and Real Estate Sales Gain Recognition Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable. For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value. Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property. Notes Receivable The following table summarizes our notes receivable, net as of December 31, 2015 and 2014 ( dollars in thousands ): Interest rate at Balance Outstanding December 31, December 31, December 31, Note due February 2017 (a) 10.00 % $ 12,994 $ 11,869 Note due July 2017 (b) 8.00 % 2,500 2,500 Note due October 2020 (c) 8.00 % 1,200 — Total notes receivable, net $ 16,694 $ 14,369 (a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million , which bears an interest rate of 10.00% per annum. During the year ended December 31, 2015, the Company loaned an additional $1.1 million . Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (February 2017). (b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million , which bears an interest rate of 8.00% per annum. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017). (c) In October 2015, the Company entered into a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million , which bears an interest rate of 8.00% per annum. During the year ended December 31, 2015 , the Company loaned $1.2 million under the note. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020). During the years ended December 31, 2015 , 2014 , and 2013 , the Company recognized $1.5 million , $3.4 million and $4.1 million , respectively, of interest income from notes receivable, of which $0.0 , $0.0 and $0.8 million , respectively, was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations. Investment in Joint Ventures and Partnerships We use the equity method to account for investments in joint ventures and partnerships that qualify as variable interest entities where we are not the primary beneficiary and other entities that we do not control or where we do not own a majority of the economic interest but have the ability to exercise significant influence over the operating and financial policies of the investee. Throughout these financial statements we use the term “joint venture” or “partnership” when referring to investments in entities in which we do not have a 100% ownership interest. The Company also uses the equity method when we function as the managing partner and our venture partner has substantive participating rights or where we can be replaced by our venture partner as managing partner without cause. For a joint venture or partnership accounted for under the equity method, our share of net earnings or losses is reflected as income/loss when earned/incurred and distributions are credited against our investment in the joint venture or partnership as received. In determining whether a joint venture or partnership is a variable interest entity, the Company considers: the form of our ownership interest and legal structure; the size of our investment; the financing structure of the entity, including necessity of subordinated debt; estimates of future cash flows; ours and our partner’s ability to participate in the decision making related to acquisitions, disposition, budgeting and financing of the entity; obligation to absorb losses and preferential returns; nature of our partner’s primary operations; and the degree, if any, of disproportionality between the economic and voting interests of the entity. As of December 31, 2015 , the Company did not determine any of our joint ventures or partnerships to be variable interest entities. We evaluate our investments in unconsolidated joint ventures for events or changes in circumstances that indicate there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, the fair value of the property of the joint venture, and the relationships with the other joint venture partners and its lenders. The amount of loss recognized is the excess of the investment’s carrying amount over its estimated fair value. If we believe that the decline in fair value is temporary, no impairment is recorded. The aforementioned factors are taken into consideration as a whole by management in determining the valuation of our equity method investments. Should the actual results differ from management’s judgment, the valuation could be negatively affected and may result in a negative impact to our Consolidated Financial Statements. Derivative Financial Instruments The Company utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. Derivative financial instruments are recorded on our Consolidated Balance Sheets as either an asset or liability and measured quarterly at their fair value. The changes in fair value for cash flow hedges that are deemed effective are reflected in other comprehensive income/(loss) and for non-designated derivative financial instruments in earnings. The ineffective component of cash flow hedges, if any, is recorded in earnings. Redeemable Noncontrolling Interests in the Operating Partnership and DownREIT Partnership Interests in the Operating Partnership and the DownREIT Partnership held by limited partners are represented by OP Units and DownREIT Units, respectively. The income is allocated to holders of OP Units/DownREIT Units based upon net income available to common stockholders and the weighted average number of OP Units/DownREIT Units outstanding to total common shares plus OP Units/DownREIT Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the partnership agreements of the Operating Partnership and the DownREIT Partnership. Limited partners of the Operating Partnership and the DownREIT Partnership have the right to require such partnership to redeem all or a portion of the OP Units/DownREIT Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable), provided that such OP Units/DownREIT Units have been outstanding for at least one year. UDR, as the general partner of the Operating Partnership and the DownREIT Partnership may, in its sole discretion, purchase the OP Units/DownREIT Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of Common Stock of the Company for each OP Unit/DownREIT Unit), as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable. Accordingly, the Company records the OP Units outside of permanent equity and reports the OP Units at their redemption value using the Company’s stock price at each balance sheet date. Income Taxes Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”). Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of December 31, 2015 and 2014 , UDR’s net deferred tax asset of $11.8 million , net of valuation allowance of $0.1 million , and $7.0 million , which had no valuation allowance, respectively, was included in Other assets on the Consolidated Balance Sheets. GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition. The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely tha n not (greater than 50 percent probability) to b e sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement. UDR had no material unrecognized tax benefit, accrued interest or penalties at December 31, 2015 . UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2011 through 2014 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in income tax expense. Discontinued Operations Prior to the adoption of ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , the results of operations for those properties sold during the year or classified as held for sale at the end of the current year were classified as discontinued operations in the current and prior periods. Further, to meet the discontinued operations criteria, the Company will not have any significant continuing involvement in the ownership or operation of the property after the sale or disposition. Once a property is classified as held for sale, depreciation is no longer recorded. However, if the Company determines that the property no longer meets the criteria for held for sale, the Company will recapture any unrecorded depreciation on the property. The assets and liabilities, if any, of properties classified as held for sale are presented separately on the Consolidated Balance Sheets at the lower of their carrying amount or their estimated fair value less the costs to sell the assets. (See Note 3, Discontinued Operations and Assets Held for Sale, for further discussion). Stock-Based Employee Compensation Plans The Company measures the cost of employee services received in exchange for an award of an equity instrument based on the award’s fair value on the grant date and recognizes the cost over the period during which the employee is required to provide service in exchange for the award, which is generally the vesting period. The fair value for stock options issued by the Company is calculated utilizing the Black-Scholes-Merton formula. For performance based awards, the Company remeasures the fair value each balance sheet date with adjustments made on a cumulative basis until the award is settled and the final compensation is known. The fair value for market based awards issued by the Company is calculated utilizing a Monte Carlo simulation. For further discussion, see Note 9, Employee Benefit Plans. Advertising Costs All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item General and administrative . During the years ended December 31, 2015 , 2014 , and 2013 , total advertising expense was $6.4 million , $6.0 million , and $5.7 million , respectively. Cost of Raising Capital Costs incurred in connection with the issuance of equity securities are deducted from stockholders’ equity. Costs incurred in connection with the issuance or renewal of debt are recorded based on the terms of the debt issuance or renewal. Accordingly, if the terms of the renewed or modified debt instrument are deemed to be substantially different (i.e. a 10 percent or greater difference in the cash flows between instruments), all unamortized financing costs associated with the extinguished debt are charged to earnings in the current period and certain costs of new debt issuances are capitalized and amortized over the term of the debt. When the cash flows are not substantially different, the lender costs associated with the renewal or modification are capitalized and amortized into interest expense over the remaining term of the related debt instrument and other related costs are expensed. The balance of any unamortized financing costs associated with retired debt is expensed upon retirement. Deferred financing costs for new debt instruments include fees and costs incurred by the Company to obtain financing. Deferred financing costs are generally amortized on a straight-line basis, which approximates the effective interest method, over a period not to exceed the term of the related debt. Comprehensive Income/(Loss) Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the years ended December 31, 2015 , 2014 , and 2013 , the Company's other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments and marketable securities reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to redeemable noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in interest expense in the accompanying Consolidated Statements of Operations. See Note 13, Derivatives and Hedging Activity, for further discussion. The (gain)/loss on marketable securities reclassified from other comprehensive income/(loss) is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the years ended December 31, 2015 , 2014 , and 2013 was $(0.3) million , $(0.1) million , and $0.3 million , respectively. Use of Estimates The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. Market Concentration Risk The Company is subject to increased exposure from economic and other competitive factors specific to markets where the Company holds a significant percentage of the carrying value of its real estate portfolio. At December 31, 2015 , the Company held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; Metropolitan D.C.; and New York, New York markets.

Real Estate Owned

Real Estate Owned	12 Months Ended
	Dec. 31, 2015
Real Estate [Abstract]
REAL ESTATE OWNED	REAL ESTATE OWNED Real estate assets owned by the Company consist of income producing operating properties, properties under development, land held for future development, and sold or held for sale properties. As of December 31, 2015 , the Company owned and consolidated 133 communities in 10 states plus the District of Columbia totaling 40,728 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2015 and 2014 (dollars in thousands): December 31, December 31, 2014 Land $ 1,833,156 $ 1,790,281 Depreciable property — held and used: Land improvements 173,821 189,940 Building, improvements, and furniture, fixtures and equipment 7,046,622 6,225,406 Under development: Land 78,085 24,584 Building, improvements, and furniture, fixtures and equipment 45,987 153,048 Real estate held for disposition: Land 9,963 — Building, improvements, and furniture, fixtures and equipment 2,642 — Real estate owned 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Real estate owned, net $ 6,543,402 $ 5,948,487 Acquisitions In October 2015, the Company completed the acquisition of six Washington, D.C. area properties from Home Properties, L.P., a New York limited partnership (“Home OP”), for a total contractual purchase price of $900.6 million , which was comprised of $564.8 million of newly issued units of limited partnership interest (“DownREIT Units”) in the newly formed DownREIT Partnership issued at $35 per unit (a total of 16.1 million units), the assumption of $89.3 million of debt, $221.0 million of reverse tax-deferred like-kind exchanges under Section 1031 of the Internal Revenue Code of 1986 (“Section 1031 exchanges”), and $25.5 million of cash. In addition, the Company issued approximately 14.0 million shares of its Series F Preferred Stock to former limited partners of Home OP, which had the right to subscribe for one share of Series F Preferred Stock for each DownREIT Unit issued in connection with the acquisitions. The Company holds a 50.1% controlling ownership interest in, and consolidates, the DownREIT Partnership. See Note 11, Noncontrolling Interests , for additional information regarding the DownREIT Partnership formation and the Company’s controlling rights in the partnership. Of the six properties acquired from Home OP, four were acquired through the DownREIT Partnership, one was acquired by the Company through a reverse Section 1031 exchange and one was acquired by the Operating Partnership through a reverse Section 1031 exchange, as reflected in the following table: Property Location Eleven55 Ripley (a) Silver Spring, MD Arbor Park of Alexandria (a) Alexandria, VA Newport Village (a) Alexandria, VA The Courts at Dulles (a) Herndon, VA 1200 East West (b) Silver Spring, MD Courts at Huntington Station (c) Alexandria, VA (a) Acquired through the DownREIT Partnership. (b) Acquired by the Company through a reverse Section 1031 exchange. (c) Acquired by the Operating Partnership through a reverse Section 1031 exchange. The Company has performed a valuation analysis of the fair market value of the assets and liabilities of the properties acquired from Home OP. The following table summarizes the allocation of the purchase price as of the acquisition date ( in thousands ): Assets: Land $ 173,924 Buildings 708,455 Intangible assets 25,455 Total assets 907,834 Liabilities: Secured debt (96,486 ) Below-market in-place leases (542 ) Total liabilities (97,028 ) Total assets acquired less liabilities assumed $ 810,806 Substantially all acquired intangible assets will be amortized in 2016 based on the average term of acquired leases of 14 months or less. The Company’s results of operations include operating revenues of $15.6 million and net loss from continuing operations of $9.2 million related to the six Washington, D.C. area properties acquired from Home OP from the acquisition date to December 31, 2015. The unaudited pro forma information below summarizes the Company’s combined results of operations for the years ended December 31, 2015 and 2014 as though the above acquisition was completed on January 1, 2014. The information for the year ended December 31, 2015 includes pro forma results for the portion of the period prior to the acquisition date and actual results from the date of acquisition through the end of the period. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the Company’s results of operations for future periods ( in thousands ): Year Ended December 31, 2015 2014 Pro forma revenues $ 943,421 $ 877,287 Pro forma net income/(loss) attributable to common stockholders $ 319,385 $ 105,875 In February 2015, the Company acquired an office building in Highlands Ranch, Colorado, for total consideration of approximately $24.0 million , which was comprised of assumed debt. The Company’s corporate offices, as well as other leased office space, are located in the acquired building. The building consists of approximately 120,000 square feet. All existing leases were assumed by the Company at the time of the acquisition. In 2014, the Company acquired a fully-entitled land parcel for future development located in Huntington Beach, California for $77.8 million , two communities, located in Seattle, Washington and Kirkland, Washington, with a total of 358 apartment homes for $45.5 million and $75.2 million , respectively, and a land parcel for future development located in Boston, Massachusetts for $32.2 million . The four acquisitions during the year ended December 31, 2014 were accomplished through tax-deferred Section 1031 exchanges. The Company incurred $2.1 million , $0.4 million and $0.1 million of acquisition-related costs during the years ended December 31, 2015 , 2014 , and 2013 , respectively. These expenses are reported within the line item General and Administrative on the Consolidated Statements of Operations. Dispositions During the year ended December 31, 2015 , the Company sold 12 communities with a total of 2,735 apartment homes for gross proceeds of $408.7 million , resulting in net proceeds of $387.7 million and a total gain of $251.7 million . A portion of the sale proceeds was designated for tax-deferred Section 1031 exchanges for a 2014 acquisition and the October 2015 acquisitions. During the year ended December 31, 2014, the Company sold nine communities consisting of a total of 2,500 apartment homes, an adjacent parcel of land, and one operating property for gross proceeds of $328.4 million , resulting in net proceeds of $324.4 million and a total gain, net of tax, of $138.6 million . A portion of the sale proceeds was designated for tax-deferred Section 1031 exchanges that was used to fund acquisitions of real estate as discussed above. In December 2014, the Company sold a 49% interest in 13th and Market and a 50% interest in 3033 Wilshire to MetLife for approximately $54.2 million and $8.3 million , respectively, and recognized, net of tax, a gain of $7.2 million and a loss of $2.2 million , respectively. Subsequent to the sale, the two communities are accounted for under the equity method of accounting and are included in Investment in and advances to unconsolidated joint ventures, net on the Consolidated Balance Sheets. See further discussion of this transaction in Note 5, Joint Ventures and Partnerships . The activity of the two communities prior to sale is classified as a component of continuing operations on the Consolidated Statements of Operations. In February 2016, the Company sold a parcel of land located in Santa Monica, California for net proceeds of approximately $9.6 million and a net gain of approximately $2.1 million . In December 2015, the Company received a nonrefundable deposit on the pending sale of a parcel of land located in Santa Monica, California. The asset is included in Real estate held for disposition on the Consolidated Balance Sheets as of December 31, 2015. The sale is expected to close in March 2016 at a gross sales price of $13.5 million .

Joint Ventures

Joint Ventures	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
JOINT VENTURES	JOINT VENTURES AND PARTNERSHIPS UDR has entered into joint ventures and partnerships with unrelated third parties to acquire real estate assets that are either consolidated and included in Real Estate Owned on the Consolidated Balance Sheets or are accounted for under the equity method of accounting, and are included in Investment in and Advances to Unconsolidated Joint Ventures, Net on the Consolidated Balance Sheets. The Company consolidates the entities that we control as well as any variable interest entity where we are the primary beneficiary. In addition, the Company consolidates any joint venture or partnership in which we are the general partner or managing partner and the third party does not have the ability to substantively participate in the decision-making process nor the ability to remove us as general partner or managing partner without cause. UDR’s joint ventures and partnerships are funded with a combination of debt and equity. Our losses are limited to our investment and except as noted below, the Company does not guarantee any debt, capital payout or other obligations associated with our joint ventures and partnerships. The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships. The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of December 31, 2015 and 2014 (dollars in thousands) : Joint Venture Location of Properties Number of Properties Number of Apartment Homes Investment at UDR’s Ownership Interest December 31, December 31, December 31, December 31, December 31, December 31, Operating and development: UDR/MetLife I Various 4 land parcels — $ 15,894 $ 13,306 17.2 % 15.7 % UDR/MetLife II (a) Various 21 operating communities 4,642 425,230 431,277 50.0 % 50.0 % Other UDR/MetLife Development Joint Ventures 1 operating community; 4 development communities (b); Various 1 land parcels 1,437 171,659 134,939 50.6 % 50.6 % UDR/MetLife Vitruvian Park ® Addison, TX 3 operating communities; 6 land parcels 1,130 73,469 80,302 50.0 % 50.0 % UDR/KFH Washington, D.C. 3 operating communities 660 17,211 21,596 30.0 % 30.0 % Texas (c) Texas — — — (25,901 ) — % 20.0 % Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment 703,463 655,519 Investment at Income from investments for the years ending December 31, Location Rate Years To Maturity December 31, December 31, 2015 2014 2013 Participating loan investment: Steele Creek Denver, CO 6.5% 1.6 90,747 62,707 $ 5,453 $ 2,350 $ 156 Preferred equity investment: West Coast Development Joint Venture (d) Various 6.5% — 144,696 — $ 3,692 $ — $ — Total investment in and advances to unconsolidated joint ventures, net $ 938,906 $ 718,226 (a) In September 2015, the 717 Olympic community, which is held by the UDR/MetLife II joint venture, experienced extensive water damage due a ruptured water pipe. For the year ended December 31, 2015, the Company recorded losses of $2.5 million , its proportionate share of the total losses incurred. (b) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes. As of December 31, 2015 , no apartment homes had been completed in Other UDR/MetLife Development Joint Ventures. (c) In January 2015, the eight communities held by the Texas joint venture were sold, generating net proceeds to UDR of $44.2 million . The Company recorded promote and fee income of $10.0 million and a gain of $59.4 million (including $24.2 million of previously deferred gains) in connection with the sale. (d) In May 2015, the Company entered into a joint venture agreement with real estate private equity firm, The Wolff Company (“Wolff”), and agreed to pay $136.3 million for a 48 percent ownership interest in a portfolio of five communities that are currently under construction (the "West Coast Development Joint Venture"). The communities are located in three of the Company’s core, coastal markets: Metro Seattle, Los Angeles and Orange County, CA. UDR earns a 6.5 percent preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80 percent occupancy for ninety consecutive days, while Wolff is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage. The Company will serve as property manager and be paid a management fee during the lease-up phase and subsequent operation of each of the communities. Wolff is the general partner of the joint venture and the developer of the communities. The Company has a fixed price option to acquire Wolff’s remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total price will be $597.4 million . In the event the Company does not exercise its options to purchase at least two communities, Wolff will be entitled to earn a contingent disposition fee equal to 6.5 percent return on its implied equity in the communities not acquired. Wolff is providing certain guaranties and there are construction loans on all five communities. Once completed, the five communities will contain 1,533 homes. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting. The Company's recorded equity investment in the West Coast Development Joint Venture at December 31, 2015 of $144.7 million is inclusive of outside basis costs and our accrued but unpaid preferred return. During the year ended December 31, 2015 , the Company earned a preferred return of $5.2 million , offset by its share of the West Coast Development Joint Venture transaction expenses of $1.5 million . As of December 31, 2015 and 2014 , the Company had deferred fees and deferred profit of $6.8 million and $24.7 million , respectively, which will be recognized through earnings over the weighted average life of the related properties, upon the disposition of the properties to a third party, or upon completion of certain development obligations. The Company recognized $11.3 million , $11.3 million , and $11.2 million of management fees during the years ended December 31, 2015 , 2014 , and 2013 , respectively, for our management of the joint ventures and partnerships. The management fees are included in Joint venture management and other fees on the Consolidated Statements of Operations. The Company may, in the future, make additional capital contributions to certain of our joint ventures and partnerships should additional capital contributions be necessary to fund development, acquisitions or operations. We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decrease in the value of its other investments in unconsolidated joint ventures or partnerships during the years ended December 31, 2015 , 2014 , and 2013 . Combined summary financial information relating to all of the unconsolidated joint ventures and partnerships operations (not just our proportionate share), is presented below for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands): As of and For the Year Ended December 31, 2015 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 541 $ 170,062 $ 7,634 $ 22,139 $ 19,338 $ — $ 219,714 Property operating expenses (906 ) (63,516 ) (3,826 ) (11,519 ) (7,733 ) — (87,500 ) Real estate depreciation and amortization (818 ) (46,616 ) (6,897 ) (6,639 ) (14,522 ) — (75,492 ) Operating income/(loss) (1,183 ) 59,930 (3,089 ) 3,981 (2,917 ) — 56,722 Interest expense — (52,037 ) (2,566 ) (4,848 ) (5,539 ) — (64,990 ) Income/(loss) from discontinued operations (20 ) — — — — 184,138 184,118 Net income/(loss) $ (1,203 ) $ 7,893 $ (5,655 ) $ (867 ) $ (8,456 ) $ 184,138 $ 175,850 UDR recorded income (loss) from unconsolidated entities $ (513 ) $ 3,578 $ 6,088 $ (3,711 ) $ (2,537 ) $ 59,424 $ 62,329 Condensed Balance Sheets: Total real estate, net $ 92,915 $ 1,942,630 $ 604,611 $ 273,897 $ 221,704 $ — $ 3,135,757 Cash and cash equivalents 1,202 20,767 5,996 7,185 1,320 10 36,480 Other assets 174 24,914 1,921 2,317 565 — 29,891 Total assets 94,291 1,988,311 612,528 283,399 223,589 10 3,202,128 Amount due to/(from) UDR 2 — 5,929 908 427 — 7,266 Third party debt — 1,122,662 201,114 126,388 164,299 — 1,614,463 Accounts payable and accrued liabilities 395 24,244 62,267 7,137 1,480 — 95,523 Total liabilities 397 1,146,906 269,310 134,433 166,206 — 1,717,252 Total equity $ 93,894 $ 841,405 $ 343,218 $ 148,966 $ 57,383 $ 10 $ 1,484,876 UDR’s investment in and advances to unconsolidated joint ventures $ 15,894 $ 425,230 $ 407,102 $ 73,469 $ 17,211 $ — $ 938,906 As of and For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 727 $ 152,047 $ 1,579 $ 19,376 $ 19,724 $ — $ 193,453 Property operating expenses 618 52,150 1,122 10,711 7,498 — 72,099 Real estate depreciation and amortization 2,130 41,504 3,959 7,380 14,426 — 69,399 Operating income/(loss) (2,021 ) 58,393 (3,502 ) 1,285 (2,200 ) — 51,955 Interest expense — (48,493 ) (94 ) (4,131 ) (5,873 ) — (58,591 ) Income/(loss) from discontinued operations (31,802 ) — — — — (4,229 ) (36,031 ) Net income/(loss) $ (33,823 ) $ 9,900 $ (3,596 ) $ (2,846 ) $ (8,073 ) $ (4,229 ) $ (42,667 ) UDR recorded income/(loss) from unconsolidated entities $ (2,955 ) $ 2,814 $ 576 $ (4,068 ) $ (2,601 ) $ (772 ) $ (7,006 ) Condensed Balance Sheets: Total real estate, net $ 89,482 $ 1,986,237 $ 351,861 $ 278,600 $ 235,623 $ — $ 2,941,803 Assets held for sale 1,978 — — — — 214,218 216,196 Cash and cash equivalents 1,983 15,245 6,239 6,570 2,507 — 32,544 Other assets (a) (146 ) 12,938 1,101 3,248 708 — 17,849 Total assets (a) 93,297 2,014,420 359,201 288,418 238,838 214,218 3,208,392 Amount due to/(from) UDR 107 (444 ) 843 1,960 531 — 2,997 Third party debt (a) — 1,140,458 65,408 122,964 164,789 — 1,493,619 Liabilities held for sale 5,110 — — — — 224,596 229,706 Accounts payable and accrued liabilities (a) 749 17,573 17,851 6,766 1,396 — 44,335 Total liabilities (a) 5,966 1,157,587 84,102 131,690 166,716 224,596 1,770,657 Total equity $ 87,331 $ 856,833 $ 275,099 $ 156,728 $ 72,122 $ (10,378 ) $ 1,437,735 UDR’s investment in and advances to unconsolidated joint ventures $ 13,306 $ 431,277 $ 197,646 $ 80,302 $ 21,596 $ (25,901 ) $ 718,226 (a) The Company elected to early adopt FASB ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, and ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , during the fourth quarter of 2015. See Note 2, Significant Accounting Policies , for a complete description of the ASUs and their impact. Under the ASUs, deferred financing costs related to debt are treated as offsets to the debt instead of assets. As a result of adopting the ASUs, the following retrospective changes were made to the above table: For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Other assets - as previously reported $ (146 ) $ 19,589 $ 4,203 $ 3,933 $ 1,128 $ — $ 28,707 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Other assets - as presented above $ (146 ) $ 12,938 $ 1,101 $ 3,248 $ 708 $ — $ 17,849 Total assets - as previously reported $ 93,297 $ 2,021,071 $ 362,303 $ 289,103 $ 239,258 $ 214,218 $ 3,219,250 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total assets - as presented above $ 93,297 $ 2,014,420 $ 359,201 $ 288,418 $ 238,838 $ 214,218 $ 3,208,392 Third party debt - as previously reported $ — $ 1,147,109 $ 68,510 $ 123,649 $ 165,209 $ — $ 1,504,477 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Third party debt - as presented above $ — $ 1,140,458 $ 65,408 $ 122,964 $ 164,789 $ — $ 1,493,619 Accounts payable and accrued liabilities - as previously reported $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Deferred financing costs — — — — — — — Accounts payable and accrued liabilities - as presented above $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Total liabilities - as previously reported $ 5,966 $ 1,164,238 $ 87,204 $ 132,375 $ 167,136 $ 224,596 $ 1,781,515 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total liabilities - as presented above $ 5,966 $ 1,157,587 $ 84,102 $ 131,690 $ 166,716 $ 224,596 $ 1,770,657 For the Year Ended December 31, 2013 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 691 $ 109,926 $ 5,324 $ 7,680 $ 19,221 $ — $ 142,842 Property operating expenses 621 33,809 3,292 4,633 7,035 — 49,390 Real estate depreciation and amortization 115 30,122 3,564 3,830 14,199 — 51,830 Operating income/(loss) (45 ) 45,995 (1,532 ) (783 ) (2,013 ) — 41,622 Interest expense — (37,055 ) (913 ) (1,886 ) (5,872 ) — (45,726 ) Other income/(expense) — 1 — — — — 1 Income/(loss) from discontinued operations (22,388 ) — — — — (9,584 ) (31,972 ) Net income/(loss) $ (22,433 ) $ 8,941 $ (2,445 ) $ (2,669 ) $ (7,885 ) $ (9,584 ) $ (36,075 ) UDR recorded income/(loss) from unconsolidated entities $ (4,675 ) $ 4,471 $ 6,224 $ (2,851 ) $ (2,366 ) $ (1,218 ) $ (415 )

Secured Debt and Unsecured Debt

Secured Debt and Unsecured Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
SECURED DEBT AND UNSECURED DEBT	SECURED AND UNSECURED DEBT, NET The following is a summary of our secured and unsecured debt at December 31, 2015 and 2014 ( dollars in thousands): Principal Outstanding For the Year Ended December 31, 2015 Weighted Average Interest Rate Weighted Average Years to Maturity Number of Communities Encumbered December 31, 2015 2014 Secured Debt: Fixed Rate Debt Mortgage notes payable (a) $ 442,617 $ 401,210 4.57 % 4.5 8 Fannie Mae credit facilities (b) 514,462 568,086 5.23 % 3.1 18 Deferred financing costs (4,278 ) (5,583 ) Total fixed rate secured debt, net 952,801 963,713 4.93 % 3.7 26 Variable Rate Debt Mortgage notes payable 31,337 31,337 2.19 % 1.1 1 Tax-exempt secured notes payable (c) 94,700 94,700 0.75 % 7.2 2 Fannie Mae credit facilities (b) 299,378 266,196 1.71 % 4.1 8 Deferred financing costs (1,271 ) (1,625 ) Total variable rate secured debt, net 424,144 390,608 1.53 % 4.5 11 Total Secured Debt, net 1,376,945 1,354,321 3.88 % 4.0 37 Unsecured Debt: Variable Rate Debt Borrowings outstanding under unsecured credit facilities due January 2020 and December 2017, respectively (d) (h) 150,000 152,500 1.19 % 4.1 Borrowings outstanding under unsecured working capital credit facility due January 2019 (e) — — — % 3.0 1.21% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 35,000 35,000 1.21 % 5.1 Fixed Rate Debt 5.25% Medium-Term Notes due January 2015 (net of discounts of $0 and $6, respectively) (f) — 325,169 — % 0.0 5.25% Medium-Term Notes due January 2016 (i) 83,260 83,260 5.25 % 0.0 6.21% Medium-Term Note due July 2016 (j) 12,091 — 6.21 % 0.5 4.25% Medium-Term Notes due June 2018 (net of discounts of $1,037 and $1,465, respectively) (h) 298,963 298,535 4.25 % 2.4 3.70% Medium-Term Notes due October 2020 (net of discounts of $38 and $46, respectively) (h) 299,962 299,954 3.70 % 4.8 1.44% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 315,000 315,000 1.44 % 5.1 4.63% Medium-Term Notes due January 2022 (net of discounts of $2,164 and $2,523, respectively) (h) 397,836 397,477 4.63 % 6.0 3.75% Medium-Term Notes due July 2024 (net of discounts of $886 and $990, respectively) (h) 299,114 299,010 3.75 % 8.5 8.50% Debentures due September 2024 15,644 15,644 8.50 % 8.7 4.00% Medium-Term Notes due October 2025 (net of discount of $671 and $0, respectively) (g) (h) 299,329 — 4.00 % 9.8 Other 24 27 N/A N/A Deferred financing costs (12,373 ) (10,598 ) N/A N/A Total Unsecured Debt, net 2,193,850 2,210,978 3.64 % 5.7 Total Debt, net $ 3,570,795 $ 3,565,299 3.74 % 5.0 For purposes of classification of the above table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Company having effectively established a fixed interest rate for the underlying debt instrument. Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. As of December 31, 2015 , secured debt encumbered $2.4 billion or 25.9% of UDR’s total real estate owned based upon gross book value ( $6.8 billion or 74.1% of UDR’s real estate owned based on gross book value is unencumbered). (a) At December 31, 2015 , fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from June 2016 through November 2025 and carry interest rates ranging from 3.43% to 6.16% . The Company will from time to time acquire properties subject to fixed rate debt instruments. In those situations, management will record the secured debt at its estimated fair value and amortize any difference between the fair value and par to interest expense over the life of the underlying debt instrument. In October 2015, the Company assumed debt with a fair market value of $96.5 million as part of our acquisition of the six communities from Home OP, as described in Note 4, Real Estate Owned . During the years ended December 31, 2015 , 2014 , and 2013 , the Company had $5.3 million , $5.1 million , and $5.1 million , respectively, of amortization expense on the fair market adjustment of debt assumed in acquisition of properties, which was included in Interest expense on the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $10.0 million and $6.7 million at December 31, 2015 and 2014 , respectively. (b) UDR has three secured credit facilities with Fannie Mae with an aggregate commitment of $813.8 million at December 31, 2015 . The Fannie Mae credit facilities are for terms of seven to ten years (maturing at various dates from May 2017 through July 2023 ) and bear interest at floating and fixed rates. At December 31, 2015 , $514.5 million of the outstanding balance was fixed at a weighted average interest rate of 5.23% and the remaining balance of $299.4 million on these facilities had a weighted average variable interest rate of 1.71% . Further information related to these credit facilities is as follows (dollars in thousands) : December 31, December 31, 2014 Borrowings outstanding $ 813,840 $ 834,282 Weighted average borrowings during the period ended 822,521 835,873 Maximum daily borrowings during the period ended 834,003 837,564 Weighted average interest rate during the period ended 4.0 % 4.1 % Weighted average interest rate at the end of the period 3.9 % 4.0 % (c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature on August 2019 and March 2032 . Interest on these notes is payable in monthly installments. The variable mortgage notes have interest rates of 0.75% and 0.76% , respectively, as of December 31, 2015 . (d) On October 20, 2015, the Company, as borrower, entered into a credit agreement (the “Credit Agreement”), which provides for a $1.1 billion senior unsecured revolving credit facility (the “Revolving Credit Facility”) and a $350.0 million senior unsecured term loan facility (the “Term Loan Facility”). The Credit Agreement includes an accordion feature that allows the total commitments under the Revolving Credit Facility and the total borrowings under the Term Loan Facility to be increased to an aggregate maximum amount of up to $2.0 billion , subject to certain conditions, including obtaining commitments from any one or more lenders. The Revolving Credit Facility has a scheduled maturity date of January 31, 2020, with two six -month extension options, subject to certain conditions. The Term Loan Facility has a scheduled maturity date of January 29, 2021. The Credit Agreement replaced (i) the Company’s previous $900 million revolving credit facility originally scheduled to mature in December 2017 and (ii) the Company’s $250 million term loan and the Company’s $100 million term loan, both originally due June 2018. Based on the Company’s current credit rating, the Revolving Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points and a facility fee of 15 basis points, and the Term Loan Facility has an interest rate equal to LIBOR plus a margin of 95 basis points. Depending on the Company’s credit rating, the margin under the Revolving Credit Facility ranges from 85 to 155 basis points, the facility fee ranges from 12.5 to 30 basis points, and the margin under the Term Loan Facility ranges from 90 to 175 basis points. The Credit Agreement contains customary representations and warranties and financial and other affirmative and negative covenants. The Credit Agreement also includes customary events of default, in certain cases subject to customary periods to cure. The occurrence of an event of default, following the applicable cure period, would permit the lenders to, among other things, declare the unpaid principal, accrued and unpaid interest and all other amounts payable under the Credit Agreement to be immediately due and payable. The Company’s obligations under the Credit Agreement are guaranteed by the Operating Partnership, pursuant to a guaranty dated as of October 20, 2015. The following is a summary of short-term bank borrowings under UDR’s revolving credit facility at December 31, 2015 and 2014 (dollars in thousands): December 31, 2015 December 31, 2014 Total revolving credit facility $ 1,100,000 $ 900,000 Borrowings outstanding at end of period (1) 150,000 152,500 Weighted average daily borrowings during the period ended 353,647 291,761 Maximum daily borrowings during the period ended 541,500 625,000 Weighted average interest rate during the period ended 1.1 % 1.2 % Interest rate at end of the period 1.2 % 1.1 % (1) Excludes $2.3 million and $1.9 million of letters of credit at December 31, 2015 and 2014 , respectively. (e) In December 2015, the Company entered into a working capital credit facility, which provides for a $30 million unsecured revolving credit facility (the “Working Capital Credit Facility”) with a scheduled maturity date of January 1, 2019. Based on the Company’s current credit rating, the Working Capital Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points. Depending on the Company’s credit rating, the margin ranges from 85 to 155 basis points. (f) Paid off at maturity with borrowings under the Company’s $900 million unsecured revolving credit facility. (g) On September 22, 2015, the Company issued $300 million of 4.00% senior unsecured medium-term notes due October 1, 2025. Interest is payable semi-annually beginning on April 1, 2016. The notes were priced at 99.770% of the principal amount at issuance and had a discount of $0.7 million at December 31, 2015 . The Company used the net proceeds to pay down a portion of the borrowings outstanding on its prior $900 million unsecured credit facility and for general corporate purposes. The Company previously entered into forward starting interest rate swaps to hedge against interest rate risk on $200 million of this debt issuance. The all-in weighted average interest rate, inclusive of the impact of these interest rate swaps, was 4.55% . (h) The Operating Partnership is a guarantor at December 31, 2015 and 2014 . (i) In January 2016, we paid off $83.3 million of 5.25% medium-term notes due January 2016 with borrowings under the Company’s $1.1 billion unsecured revolving credit facility. (j) The 6.21% Medium-Term Note due July 2016 was acquired in February 2015 as part of the acquisition of an office building in Highlands Ranch, Colorado, as described in See Note 4, Real Estate Owned. The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next ten years subsequent to December 31, 2015 are as follows (dollars in thousands): Year Total Fixed Secured Debt Total Variable Secured Debt Total Secured Debt Total Unsecured Debt Total Debt 2016 $ 149,058 $ — $ 149,058 $ 95,053 $ 244,111 2017 179,189 96,337 275,526 — 275,526 2018 73,096 137,969 211,065 300,000 511,065 2019 247,796 67,700 315,496 — 315,496 2020 170,664 — 170,664 450,000 620,664 2021 — — — 350,000 350,000 2022 — — — 400,000 400,000 2023 — 96,409 96,409 — 96,409 2024 — — — 315,644 315,644 2025 127,600 — 127,600 300,000 427,600 Thereafter — 27,000 27,000 — 27,000 Subtotal 947,403 425,415 1,372,818 2,210,697 3,583,515 Non-cash (a) 5,398 (1,271 ) 4,127 (16,847 ) (12,720 ) Total $ 952,801 $ 424,144 $ 1,376,945 $ 2,193,850 $ 3,570,795 (a) Includes the unamortized balance of fair market value adjustments, premiums/discounts, deferred hedge gains, and deferred financing costs. For the years ended December 31, 2015 and 2014, the Company amortized $7.0 million and $7.2 million , respectively, of deferred financing costs into Interest expense . We were in compliance with the covenants of our debt instruments at December 31, 2015 .

Income_(Loss) Per Share (Notes)

Income/(Loss) Per Share (Notes)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	INCOME/(LOSS) PER SHARE The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per share: Income/(loss) from continuing operations $ 105,482 $ 16,260 $ 2,340 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,572 — (Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) 48 (Income)/loss from continuing operations attributable to noncontrolling interests (3 ) 3 60 Income/(loss) from continuing operations attributable to UDR, Inc. 340,383 154,324 2,448 Distributions to preferred stockholders - Series E (Convertible) (3,722 ) (3,724 ) (3,724 ) Income/(loss) from continuing operations attributable to common stockholders - basic 336,661 150,600 (1,276 ) Dilutive distributions to preferred stockholders - Series E (Convertible) 3,722 — — Income/(loss) from continuing operations attributable to common stockholders - dilutive $ 340,383 $ 150,600 $ (1,276 ) Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 (Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership — — (1,578 ) Income/(loss) from discontinued operations attributable to common stockholders $ — $ 10 $ 42,364 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Denominator for income/(loss) per share - basic and diluted: Weighted average common shares outstanding 259,873 252,707 250,684 Non-vested restricted stock awards (1,204 ) (1,179 ) (715 ) Denominator for income/(loss) per share - basic 258,669 251,528 249,969 Incremental shares issuable from assumed conversion of dilutive preferred stock, stock options and unvested restricted stock 5,083 1,917 — Denominator for income/(loss) per share - diluted 263,752 253,445 249,969 Income/(loss) per weighted average common share - basic: Income/(loss) from continuing operations attributable to common stockholders $ 1.30 $ 0.60 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.30 $ 0.60 $ 0.16 Income/(loss) per weighted average common share - diluted: Income/(loss) from continuing operations attributable to common stockholders $ 1.29 $ 0.59 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.29 $ 0.59 $ 0.16 Basic income/(loss) per common share is computed based upon the weighted average number of common shares outstanding. Diluted income/(loss) per share is computed based upon the common shares issuable from the assumed conversion of the OP Units and DownREIT Units, convertible preferred stock, stock options, and restricted stock. Only those instruments having a dilutive impact on our basic income/(loss) per share are included in diluted income/(loss) per share during the periods. For the year ended December 31, 2015 , the Company’s Series E preferred stock, stock options, and unvested restricted stock were dilutive. The effect of the conversion of the OP Units and DownREIT Units was not dilutive, and therefore not included in the above calculations. For the year ended December 31, 2014 , the Company’s stock options and unvested restricted stock were dilutive for purposes of calculating income/(loss) per share. The effect of the conversion of the OP Units and the Company’s Series E preferred stock were not dilutive, and therefore not included in the above calculations. For the year ended December 31, 2013, the effect of the conversion of the OP Units, the Company’s Series E preferred stock, stock options and restricted stock were not included in the above calculations as the Company reported a loss from continuing operations attributable to common stockholders. The following table sets forth the additional shares of common stock outstanding by equity instrument if converted to common stock for each of the years ended December 31, 2015 , 2014 , and 2013 (shares in thousands) : Year Ended December 31, 2015 2014 2013 OP Units 12,947 9,247 9,337 DownREIT Units 16,229 — — Preferred Stock 3,032 3,036 3,036 Stock options and unvested restricted stock 2,051 1,917 1,584

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2015
Stockholders' Equity Attributable to Parent [Abstract]
STOCKHOLDERS’ EQUITY	STOCKHOLDERS’ EQUITY UDR has an effective registration statement that allows the Company to sell an undetermined number of debt and equity securities as defined in the prospectus. The Company has the ability to issue 350,000,000 shares of common stock and 50,000,000 shares of preferred shares as of December 31, 2015 . The following table presents the changes in the Company’s issued and outstanding shares of common and preferred stock for the years ended December 31, 2015 , 2014 and 2013 : Common Stock Preferred Stock Series E Series F Balance at December 31, 2012 250,139,408 2,803,812 2,464,183 Issuance/(forfeiture) of common and restricted shares, net 533,966 — — Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership 76,291 — — Balance at December 31, 2013 250,749,665 2,803,812 2,464,183 Issuance/(forfeiture) of common and restricted shares, net 801,054 — — Issuance of common shares through public offering 3,410,433 — — Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership 153,451 — — Balance at December 31, 2014 255,114,603 2,803,812 2,464,183 Issuance/(forfeiture) of common and restricted shares, net 270,628 — — Issuance of common shares through public offering 6,339,636 — — Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership 112,174 — — Conversion of Series E Cumulative Convertible shares 7,480 (6,909 ) — Issuance of Series F shares — — 13,988,313 Balance at December 31, 2015 261,844,521 2,796,903 16,452,496 Common Stock The company has an equity distribution agreement which allows it from time to time, through its sales agents, to offer and sell up to 20,000,000 shares of its common stock. Sales of such shares will be made by means of ordinary brokers’ transactions on the NYSE at market prices. As of December 31, 2015 , 13,078,931 shares were available for sale under the continuous equity program. During the year ended December 31, 2015 , the Company entered into the following equity transactions for our common stock: • Sold 3,439,636 shares of common stock through the Company’s equity distribution agreement at a weighted average price per share of $32.29 , for aggregate gross proceeds of approximately $111.0 million ; • Sold 2,900,000 shares of common stock through a public offering at a weighted average price per share of $35.00 , for aggregate gross proceeds of approximately $101.5 million . • Issued 551,293 shares of common stock through the Company’s 1999 Long-Term Incentive Plan (the “LTIP”); and • Converted 112,174 OP Units into Company common stock. Distributions are subject to the approval of the Board of Directors and are dependent upon our strategy, financial condition and operating results. UDR’s common distributions for the years ended December 31, 2015 , 2014 , and 2013 totaled $1.11 , $1.04 , and $0.94 per share, respectively. Preferred Stock The Series E Cumulative Convertible Preferred Stock (“Series E”) has no stated par value and a liquidation preference of $16.61 per share. Subject to certain adjustments and conditions, each share of the Series E is convertible at any time and from time to time at the holder’s option into one share of our common stock prior to a “Special Dividend” declared in 2008 ( 1.083 shares after the Special Dividend). The holders of the Series E are entitled to vote on an as-converted basis as a single class in combination with the holders of common stock at any meeting of our stockholders for the election of directors or for any other purpose on which the holders of common stock are entitled to vote. The Series E has no stated maturity and is not subject to any sinking fund or any mandatory redemption. Distributions declared on the Series E for the years ended December 31, 2015 , 2014 , and 2013 were $1.33 per share. The Series E is not listed on any exchange. At December 31, 2015 and 2014 , a total of 2,796,903 and 2,803,812 shares, respectively, of the Series E were outstanding. UDR is authorized to issue up to 20,000,000 shares of the Series F Preferred Stock (“Series F”). The Series F may be purchased by holders of UDR’s operating partnership units, or OP Units, at a purchase price of $0.0001 per share. OP Unitholders are entitled to subscribe for and purchase one share of UDR’s Series F for each OP Unit held. In connection with the acquisition of the six properties from Home OP and the formation of the DownREIT Partnership in October 2015, the Company issued 13,988,313 Series F shares to former limited partners of the Home OP, which had the right to subscribe for one share of Series F for each DownREIT Unit issued in connection with the acquisitions. At December 31, 2015 and 2014 , a total of 16,452,496 and 2,464,183 shares, respectively, of the Series F were outstanding with an aggregate purchase value of $1,645 and $246 , respectively. Holders of the Series F are entitled to one vote for each share of the Series F they hold, voting together with the holders of our common stock, on each matter submitted to a vote of security holders at a meeting of our stockholders. The Series F does not entitle its holders to dividends or any other rights, privileges or preferences. Distribution Reinvestment and Stock Purchase Plan UDR’s Distribution Reinvestment and Stock Purchase Plan (the “Stock Purchase Plan”) allows common and preferred stockholders the opportunity to purchase, through the reinvestment of cash dividends, additional shares of UDR’s common stock. From inception through December 31, 2008, shareholders have elected to utilize the Stock Purchase Plan to reinvest their distribution for the equivalent of 9,957,233 shares of Company common stock. Shares in the amount of 10,963,730 were reserved for issuance under the Stock Purchase Plan as of December 31, 2015 . During the year ended December 31, 2015 , UDR acquired all shares issued through the open market.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS In May 2001, the stockholders of UDR approved the long term incentive plan (“LTIP”), which supersedes the 1985 Stock Option Plan. The LTIP authorizes the granting of awards which may take the form of options to purchase shares of common stock, stock appreciation rights, restricted stock, dividend equivalents, other stock-based awards, and any other right or interest relating to common stock or cash incentive awards to Company directors, employees and outside trustees to promote the success of the Company by linking individual’s compensation via grants of share based payment. During the year ended December 31, 2015, the LTIP was amended to set forth the terms of new classes of partnership interests in the Operating Partnership designated as LTIP Units. As of December 31, 2015, 19,000,000 shares were reserved on an unadjusted basis for issuance upon the grant or exercise of awards under the LTIP. As of December 31, 2015 , there were 9,530,769 common shares available for issuance under the LTIP. The LTIP contains change of control provisions allowing for the immediate vesting of an award upon certain events such as a merger where UDR is not the surviving entity. Upon the death or disability of an award recipient all outstanding instruments will vest and all restrictions will lapse. The LTIP specifies that in the event of a capital transaction, which includes but is not limited to stock dividends, stock splits, extraordinary cash dividends and spin-offs, the number of shares available for grant in totality or to a single individual is to be adjusted proportionately. The LTIP specifies that when a capital transaction occurs that would dilute the holder of the stock award, prior grants are to be adjusted such that the recipient is no worse as a result of the capital transaction. A summary of UDR’s stock option and restricted stock activities during the year ended December 31, 2015 is as follows: Option Outstanding Option Exercisable Restricted Stock Number of Options Weighted Average Exercise Price Number of Options Weighted Average Exercise Price Number of shares Weighted Average Fair Value Per Restricted Stock Balance, December 31, 2014 2,265,842 $ 12.82 2,265,842 $ 12.82 999,978 $ 23.98 Granted — — — — 551,293 32.67 Exercised (30,879 ) 25.10 (30,879 ) 25.10 — — Vested — — — — (736,204 ) 23.52 Forfeited — — — — (14,691 ) 23.24 Balance, December 31, 2015 2,234,963 $ 12.65 2,234,963 $ 12.65 800,376 $ 30.40 As of December 31, 2015 , the Company had issued 5,083,498 shares of restricted stock under the LTIP. Stock Option Plan UDR has granted stock options to our employees, subject to certain conditions. Each stock option is exercisable into one common share. There is no remaining compensation cost related to unvested stock options as of December 31, 2015 . During the year ended December 31, 2015 , stock options with a fair value of $0.3 million were exercised. The weighted average remaining contractual life on all options outstanding as of December 31, 2015 is 2.9 years . 1,830,672 of share options had exercise prices at $10.06 and 404,291 of share options had exercise prices at $24.38 . During the years ended December 31, 2015 , 2014 , and 2013 , respectively, we did not recognize any net compensation expense related to outstanding stock options. Restricted Stock Awards Restricted stock awards are granted to Company employees, officers, and directors. The restricted stock awards are valued based upon the closing sales price of UDR common stock on the date of grant. Compensation expense is recorded under the straight-line method over the vesting period, which is generally three to four years. Restricted stock awards earn dividends payable in cash. Some of the restricted stock grants are based on the Company’s performance and are subject to adjustment during the initial one year performance period. For the years ended December 31, 2015 , 2014 , and 2013 , we recognized $3.2 million , $4.2 million , and $3.6 million of compensation expense related to the amortization of restricted stock awards, respectively. The total remaining compensation cost on unvested restricted stock awards was $3.0 million and had a weighted average remaining contractual life of 1.6 years as of December 31, 2015 . Long-Term Incentive Compensation In January 2015, certain officers of the Company were awarded a restricted stock grant under the 2015 Long-Term Incentive Program (“2015 LTI”). One-third of the 2015 LTI award is based upon FFO as Adjusted over a one-year period and will vest fifty percent on the one-year anniversary and fifty percent on the two-year anniversary of the end of the performance period. The remaining two-thirds of the 2015 LTI award is based on Total Shareholder Return (“TSR”) as measured relative to comparable apartment REITs over a three-year period and will vest 100% at the end of the three-year performance period. The portion of the restricted stock grant based upon FFO as Adjusted was valued based upon the closing sales price of UDR common stock on the date of grant. The portion of the restricted stock grant based upon TSR was valued at $34.14 per share on the grant date as determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation using a volatility factor of 16.5% . In December 2014, when the LTI program was changed from a one-year to a three-year performance period, a one-time transition (“Transition LTI”) award opportunity was approved commencing in 2015. One-third of the Transition LTI award is based upon FFO as Adjusted over a one-year period and will vest at the end of the performance period. The remaining two-thirds of the Transition LTI award is based on TSR as measured relative to comparable apartment REITs over a two-year period and will vest 100% at the end of the two-year performance period. The portion of the restricted stock grant based upon FFO as Adjusted was valued based upon the closing sales price of UDR common stock on the date of grant. The portion of the restricted stock grant based upon TSR was valued at $33.68 per share on the grant date as determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation using a volatility factor of 16.6% . The intent of the transition award is to ensure consistent reward opportunity during the phase-in period of the three-year awards under the 2015 LTI plan. In February 2014, certain officers of the Company were awarded a restricted stock grant under the 2014 Long-Term Incentive Program (“2014 LTI”). Fifty percent of the 2014 LTI award is based upon FFO as Adjusted and fifty percent is based on TSR as measured relative to comparable apartment REITs. The actual amount that vests was determined in February 2015 based upon the actual achievement of the metrics. Each award vests pro rata over three years commencing with the establishment of the award and continuing for two years following determination of the amount of the award at the end of the annual performance period. The portion of the restricted stock grant based upon FFO as Adjusted was valued based upon the closing sales price of UDR common stock on the date of grant. The portion of the restricted stock grant based upon TSR was valued at $21.15 per share on the grant date as determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation using a volatility factor of 23.8% . Compensation expense is recorded under the accelerated method over the vesting period for the 2014 LTI. In February 2013, certain officers of the Company were awarded a restricted stock grant under the 2013 Long-Term Incentive Program (“2013 LTI”). Fifty percent of the 2013 LTI award is based upon FFO and fifty percent is based on TSR as measured relative to comparable apartment REITs. The actual amount that vests was determined in February 2014 based upon the actual achievement of the metrics. Each award vests pro rata over three years commencing with the establishment of the award and continuing for two years following determination of the amount of the award at the end of the annual performance period. The portion of the restricted stock grant based upon FFO was valued based upon the closing sales price of UDR common stock on the date of grant. The portion of the restricted stock grant based upon TSR was valued at $21.97 per share on the grant date as determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation using a volatility factor of 15.8% . Compensation expense is recorded under the accelerated method over the vesting period for the 2013 LTI. For the years ended December 31, 2015, 2014 and 2013, we recognized $14.8 million , $9.8 million and $5.9 million , respectively, of compensation expense related to the amortization of the awards. The total remaining compensation cost on unvested LTI awards was $8.3 million and had a weighted average remaining contractual life of 0.9 years as of December 31, 2015 . Profit Sharing Plan Our profit sharing plan (the “Plan”) is a defined contribution plan covering all eligible full-time employees. Under the Plan, UDR makes discretionary profit sharing and matching contributions to the Plan as determined by the Compensation Committee of the Board of Directors. Aggregate provisions for contributions, both matching and discretionary, which are included in UDR’s Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 , was $1.1 million , $0.9 million , and $0.9 million , respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES For 2015 , 2014 , and 2013 , UDR believes that we have complied with the REIT requirements specified in the Code. As such, the REIT would generally not be subject to federal income taxes. For income tax purposes, distributions paid to common stockholders may consist of ordinary income, qualified dividends, capital gains, unrecaptured section 1250 gains, return of capital, or a combination thereof. Distributions that exceed our current and accumulated earnings and profits constitute a return of capital rather than taxable income and reduce the stockholder’s basis in their common shares. To the extent that a distribution exceeds both current and accumulated earnings and profits and the stockholder’s basis in the common shares, it generally will be treated as a gain from the sale or exchange of that stockholder’s common shares. Taxable distributions paid per common share were taxable as follows for the years ended December 31, 2015 , 2014 , and 2013 : Year Ended December 31, 2015 2014 2013 Ordinary income $ 0.595 $ 0.695 $ 0.744 Qualified ordinary income — 0.139 — Long-term capital gain 0.329 0.105 0.114 Unrecaptured section 1250 gain 0.168 0.076 0.067 Total $ 1.092 $ 1.015 $ 0.925 We have a TRS that is subject to federal and state income taxes. A TRS is a C-corporation which has not elected REIT status and as such is subject to United States federal and state income tax. The components of the provision for income taxes are as follows for the years ended December 31, 2015 , 2014 , and 2013 (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Income tax (benefit)/provision Current Federal $ 29 $ 147 $ (1,030 ) State 871 550 846 Total current 900 697 (184 ) Deferred Federal (4,173 ) 20,138 (6,907 ) State (613 ) 5,159 (1,190 ) Total deferred (4,786 ) 25,297 (8,097 ) Total income tax (benefit)/provision $ (3,886 ) $ 25,994 $ (8,281 ) Classification of income tax (benefit)/provision: Continuing operations $ (3,886 ) $ (15,098 ) $ (7,299 ) Gain/(loss) on sale of real estate owned — 41,087 — Discontinued operations — 5 (982 ) Deferred income taxes are provided for the change in temporary differences between the basis of certain assets and liabilities for financial reporting purposes and income tax reporting purposes. The expected future tax rates are based upon enacted tax laws. The components of our TRS deferred tax assets and liabilities are as follows for the years ended December 31, 2015 , 2014 , and 2013 (dollars in thousands): Year Ended December 31, 2015 2014 2013 Deferred tax assets: Federal and state tax attributes $ 2,227 $ — $ 13,069 Book/tax depreciation 9,016 6,692 19,354 Construction capitalization differences — 75 — Debt and interest deductions — — 10,311 Other 707 401 — Total deferred tax assets 11,950 7,168 42,734 Valuation allowance (81 ) — (1,310 ) Net deferred tax assets 11,869 7,168 41,424 Deferred tax liabilities: Construction capitalization differences — — (3,766 ) Investment in partnerships — — (5,080 ) Other (107 ) (192 ) (305 ) Total deferred tax liabilities (107 ) (192 ) (9,151 ) Net deferred tax asset $ 11,762 $ 6,976 $ 32,273 Income tax benefit/(provision), net differed from the amounts computed by applying the U.S. statutory rate of 35% to pretax income/(loss) for the years ended December 31, 2015 , 2014 , and 2013 as follows (dollars in thousands): Year Ended December 31, 2015 2014 2013 Income tax (benefit)/provision U.S. federal income tax (benefit)/provision $ (4,383 ) $ 28,819 $ (8,493 ) State income tax provision 442 2,678 46 Other items (26 ) (137 ) 246 Conversion of certain TRS entities to REITs — (5,770 ) — Valuation allowance 81 404 (80 ) Total income tax (benefit)/provision $ (3,886 ) $ 25,994 $ (8,281 ) As of December 31, 2015 , the Company, had federal net operating loss carryovers (“NOL”) of $27.1 million expiring in 2032 through 2035 , of this amount $5.7 million is available to the Company. As of December 31, 2015 , the TRS had state NOLs of approximately $64.7 million expiring in 2020 through 2032 , of this amount $4.2 million is available to the TRS. As of December 31, 2015 , the Company had a valuation allowance of $0.1 million against its state NOL. During the year ended December 31, 2015 , the Company had a net change of $0.1 million in the valuation allowance. A portion of these attributes are still available to the subsidiary REITs, but are carried at a zero effective tax rate. For the year ended December 31, 2015 , the Tax benefit/(provision), net decreased $11.2 million as compared to 2014 . The decrease was primarily a result of the Company recognizing a one-time tax benefit of $5.8 million in 2014 related to the conversion of certain taxable REIT subsidiary entities into REITs. Additionally, Gain/(loss) on sale of real estate owned, net of tax included $0.0 and approximately $41.1 million of tax for the years ended December 31, 2015 and 2014, respectively. The remaining decrease is a result of the conversion of certain TRS subsidiaries to REITs in 2014, causing a zero rate to be applied to their 2015 income. GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The financial statements reflect expected future tax consequences of income tax positions presuming the taxing authorities’ full knowledge of the tax position and all relevant facts, but without considering time values. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition. The Company evaluates our tax position using a two-step process. First, we determine whether a tax position is more likely than not (greater than 50 percent probability) to be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The Company will then determine the amount of benefit to recognize and record the amount of the benefit that is more likely than not to be realized upon ultimate settlement. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in income tax expense. As of December 31, 2015 and 2014 , UDR has no material unrecognized income tax benefits/(provisions). The Company files income tax returns in federal and various state and local jurisdictions. With few exceptions, the Company is no longer subject to federal, state and local income tax examination by tax authorities for years prior to 2011. The tax years 2011 through 2014 remain open to examination by the major taxing jurisdictions to which the Company is subject.

Noncontrolling Interests

Noncontrolling Interests	12 Months Ended
	Dec. 31, 2015
Noncontrolling Interest [Abstract]
NONCONTROLLING INTERESTS	NONCONTROLLING INTERESTS UDR Lighthouse DownREIT L.P. Formation In October 2015, in connection with the acquisition of the properties from Home OP, described in Note 4, Real Estate Owned , the Company, as the sole general partner and a limited partner, and the Operating Partnership, as a limited partner, entered into the Agreement of Limited Partnership (the “DownREIT Partnership Agreement”) of the DownREIT Partnership. As the sole general partner of the DownREIT Partnership, the Company has full, complete and exclusive discretion to manage and control the business of the DownREIT Partnership and to make all decisions affecting the business and assets of the DownREIT Partnership, subject to certain limitations set forth in the DownREIT Partnership Agreement. As of the closing of the transactions, the Company and the Operating Partnership owned approximately 8.5% and 41.6% , respectively, of the DownREIT Units, which they received in exchange for their contribution of the following properties to the DownREIT Partnership: Property Location Ridge at Blue Hills (a) Braintree, MA Residences at the Domain (a) Austin, TX Inwood West (b) Woburn, MA Thirty377 (b) Dallas, TX Legacy Village (b) Plano, TX Delancey at Shirlington (b) Arlington, VA Circle Towers (b) Fairfax, VA Barton Creek Landing (b) Austin, TX The Whitmore (b) Arlington, VA (a) Contributed by the Company. (b) Contributed by the Operating Partnership. The limited partners have no power to remove the Company as general partner of the DownREIT Partnership. The DownREIT Partnership is structured to make distributions in respect of DownREIT Units that will be equivalent to the distributions made to holders of the Company’s common stock. Subject to certain terms and conditions set forth in the DownREIT Partnership Agreement, limited partners in the DownREIT Partnership (other than the Company and its affiliates) have the right, commencing one year after the date of issuance, to tender their DownREIT Units for redemption for cash or, at the Company’s election, for shares of its common stock on a one-for-one basis (subject to the anti-dilution adjustments provided in the DownREIT Partnership Agreement). Redeemable Noncontrolling Interests in the Operating Partnership and DownREIT Partnership Interests in the Operating Partnership and the DownREIT Partnership held by limited partners are represented by OP Units and DownREIT Units, respectively. The income is allocated to holders of OP Units/DownREIT Units based upon net income attributable to common stockholders and the weighted average number of OP Units/DownREIT Units outstanding to total common shares plus OP Units/DownREIT Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the partnership agreements of the Operating Partnership and the DownREIT Partnership. Limited partners of the Operating Partnership and the DownREIT Partnership have the right to require such partnership to redeem all or a portion of the OP Units/DownREIT Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable), provided that such OP Units/DownREIT Units have been outstanding for at least one year. UDR, as the general partner of the Operating Partnership and the DownREIT Partnership may, in its sole discretion, purchase the OP Units/DownREIT Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of Common Stock of the Company for each OP Unit/DownREIT Unit), as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable. Accordingly, the Company records the OP Units outside of permanent equity and reports the OP Units at their redemption value using the Company’s stock price at each balance sheet date. The following table sets forth redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the years ended December 31, 2015 and 2014 ( dollars in thousands ): Year Ended December 31, 2015 2014 Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, beginning of year $ 282,480 $ 217,597 Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership 102,703 73,954 DownREIT Units issued for real estate, net 563,836 — Conversion of OP Units to Common Stock (3,817 ) (4,372 ) Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership 16,773 5,511 Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (15,231 ) (10,077 ) Allocation of other comprehensive income/(loss) (308 ) (133 ) Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, end of year $ 946,436 $ 282,480 The following sets forth net income/(loss) attributable to common stockholders and transfers from redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the following periods (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Conversion of OP units to UDR Common Stock 3,817 4,372 1,817 Change in equity from net income/(loss) attributable to common stockholders and conversion of OP units to UDR Common Stock $ 340,478 $ 154,982 $ 42,905 Noncontrolling Interests Noncontrolling interests represent interests of unrelated partners in certain consolidated affiliates, and is presented as part of equity in the Consolidated Balance Sheets since these interests are not redeemable. During the years ended December 31, 2015 , 2014 , and 2013 , Net (income)/loss attributable to noncontrolling interests was less than $0.1 million .

Fair Value of Derivatives and F

Fair Value of Derivatives and Financial Instruments	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS	FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below: • Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. • Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data. • Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of December 31, 2015 and 2014 are summarized as follows (dollars in thousands) : Fair Value at December 31, 2015, Using Total Carrying Amount in Statement of Financial Position at December 31, 2015 Fair Value Estimate at December 31, 2015 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 16,694 $ 16,938 $ — $ — $ 16,938 Derivatives - Interest rate contracts (b) 13 13 — 13 — Total assets $ 16,707 $ 16,951 $ — $ 13 $ 16,938 Derivatives - Interest rate contracts (b) $ 2,112 $ 2,112 $ — $ 2,112 $ — Secured debt instruments - fixed rate: (c) Mortgage notes payable 442,617 448,019 — — 448,019 Fannie Mae credit facilities 514,462 539,050 — — 539,050 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 299,378 299,378 — — 299,378 Unsecured debt instruments (c): Commercial banks 150,000 150,000 — — 150,000 Senior unsecured notes 2,056,223 2,108,687 — — 2,108,687 Total liabilities $ 3,590,829 $ 3,673,283 $ — $ 2,112 $ 3,671,171 Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d) $ 946,436 $ 946,436 $ — $ 946,436 $ — Fair Value at December 31, 2014, Using Total Carrying Amount in Statement of Financial Position at December 31, 2014 Fair Value Estimate at December 31, 2014 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 14,369 $ 14,808 $ — $ — $ 14,808 Derivatives- Interest rate contracts (b) 88 88 — 88 — Total assets $ 14,457 $ 14,896 $ — $ 88 $ 14,808 Derivatives- Interest rate contracts (b) $ 10,368 $ 10,368 $ — $ 10,368 $ — Secured debt instruments- fixed rate: (c) Mortgage notes payable 401,210 415,663 — — 415,663 Fannie Mae credit facilities 568,086 606,623 — — 606,623 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 266,196 266,196 — — 266,196 Unsecured debt instruments: (c) Commercial banks 152,500 152,500 — — 152,500 Senior unsecured notes 2,069,076 2,144,125 — — 2,144,125 Total liabilities $ 3,593,473 $ 3,721,512 $ — $ 10,368 $ 3,711,144 Redeemable noncontrolling interests in the Operating Partnership (d) $ 282,480 $ 282,480 $ — $ 282,480 $ — (a) See Note 2 , Significant Accounting Policies. (b) See Note 13, Derivatives and Hedging Activity. (c) See Note 6, Secured Debt and Unsecured Debt, Net. (d) See Note 11, Noncontrolling Interests. There were no transfers into or out of each of the levels of the fair value hierarchy. Financial Instruments Carried at Fair Value The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2015 and 2014 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership have a redemption feature and are marked to their redemption value. The redemption value is based on the fair value of the Company’s common stock at the redemption date, and therefore, is calculated based on the fair value of the Company’s common stock at the balance sheet date. Since the valuation is based on observable inputs such as quoted prices for similar instruments in active markets, redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership are classified as Level 2. Financial Instruments Not Carried at Fair Value At December 31, 2015 , the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Company using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts. We estimate the fair value of our notes receivable and debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality, where applicable (Level 3). We record impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Our cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. Our estimates of fair value represent our best estimate based upon Level 3 inputs such as industry trends and reference to market rates and transactions. We consider various factors to determine if a decrease in the value of our investment in and advances to unconsolidated joint ventures, net is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, and the relationships with the other joint venture partners and its lenders. Based on the significance of the unobservable inputs, we classify these fair value measurements within Level 3 of the valuation hierarchy. The Company did not incur any other-than-temporary decrease in the value of its investments in unconsolidated joint ventures during the years ended December 31, 2015 , 2014 , and 2013 . After determining an other-than-temporary decrease in the value of an equity method investment has occurred, we estimate the fair value of our investment by estimating the proceeds we would receive upon a hypothetical liquidation of the investment at the date of measurement. Inputs reflect management’s best estimate of what market participants would use in pricing the investment giving consideration to the terms of the joint venture agreement and the estimated discounted future cash flows to be generated from the underlying joint venture assets. The inputs and assumptions utilized to estimate the future cash flows of the underlying assets are based upon the Company’s evaluation of the economy, market trends, operating results, and other factors, including judgments regarding costs to complete any construction activities, lease up and occupancy rates, rental rates, inflation rates, capitalization rates utilized to estimate the projected cash flows at the disposition, and discount rates.

Derivatives and Hedging Activit

Derivatives and Hedging Activity	12 Months Ended
	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND HEDGING ACTIVITY	DERIVATIVES AND HEDGING ACTIVITY Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its debt funding and through the use of derivative financial instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings. Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up front premium. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the years ended December 31, 2015 , 2014 , and 2013 , such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt and forecasted issuances of fixed-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the year ended December 31, 2015 , the Company recognized a loss of less than $0.1 million reclassified from Accumulated OCI to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the years ended December 31, 2014 and 2013 , the Company recorded a gain of less than $0.1 million of ineffectiveness in earnings attributable to a timing difference between the derivative and the hedged item. Amounts reported in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets relate to deferred gains/(losses) on designated derivatives that will be reclassified to interest expense as interest payments are made on the Company’s hedged debt. Through December 31, 2016 , the Company estimates that an additional $3.0 million will be reclassified as an increase to interest expense. As of December 31, 2015 , the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk ( dollars in thousands ): Product Number of Instruments Notional Interest rate swaps 5 $ 315,000 Interest rate caps 2 $ 203,166 Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the Company has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the years ended December 31, 2015 and 2014 , and a gain of $0.3 million for the year ended December 31, 2013 . As of December 31, 2015 , the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 3 $ 133,107 Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 ( dollars in thousands ): Asset Derivatives (included in Other assets ) Liability Derivatives (included in Other liabilities ) Fair Value at: Fair Value at: December 31, December 31, December 31, December 31, Derivatives designated as hedging instruments: Interest rate products $ 9 $ 86 $ 2,112 $ 10,368 Derivatives not designated as hedging instruments: Interest rate products $ 4 $ 2 $ — $ — Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Derivatives in Cash Flow Hedging Relationships Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing) Year ended December 31, Year ended December 31, Year ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 Interest rate products $ (6,393 ) $ (8,695 ) $ (469 ) $ (2,251 ) $ (4,834 ) $ (6,851 ) $ (11 ) $ 3 $ — Gain/(Loss) Recognized in Interest income and other income/(expense), net Year ended December 31, Derivatives Not Designated as Hedging Instruments 2015 2014 2013 Interest rate products $ (23 ) $ (4 ) 271 Credit-risk-related Contingent Features The Company has agreements with some of its derivative counterparties that contain a provision where (1) if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations; or (2) the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness. Certain of the Company’s agreements with its derivative counterparties contain provisions where, if there is a change in the Company’s financial condition that materially changes the Company’s creditworthiness in an adverse manner, the Company may be required to fully collateralize its obligations under the derivative instrument. At December 31, 2015 and 2014 , no cash collateral was posted or required to be posted by the Company or by a counterparty. The Company also has an agreement with a derivative counterparty that incorporates the loan and financial covenant provisions of the Company’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with these covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement. The Company has certain agreements with some of its derivative counterparties that contain a provision where, in the event of default by the Company or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative contract, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity's creditworthiness is materially weaker than the original party to the derivative agreement. As of December 31, 2015 , the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $2.2 million . If the Company had breached any of these provisions at December 31, 2015 , it would have been required to settle its obligations under the agreements at their termination value of $2.2 million . Tabular Disclosure of Offsetting Derivatives The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 ( dollars in thousands ): Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Received December 31, 2015 $ 13 $ — $ 13 $ — $ — $ 13 December 31, 2014 $ 88 $ — $ 88 $ (27 ) $ — $ 61 (a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote. Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Posted December 31, 2015 $ 2,112 $ — $ 2,112 $ — $ — $ 2,112 December 31, 2014 $ 10,368 $ — $ 10,368 $ (27 ) $ — $ 10,341 (a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Commitments Real Estate Under Development The following summarizes the Company’s real estate commitments at December 31, 2015 ( dollars in thousands ): Number of Properties Costs Incurred to Date (a) Expected Costs to Complete (unaudited) Average Ownership Stake Wholly-owned — under development 1 $ 124,072 (b) $ 217,928 100 % Wholly-owned — redevelopment 3 11,302 (b) 16,698 100 % Joint ventures: Unconsolidated joint ventures 4 497,350 81,979 (c) Various Participating loan investments 1 90,747 (d) 2,711 (e) 0 % Preferred equity investments 5 136,327 (f) — 48 % Total $ 859,798 $ 319,316 (a) Represents 100% of project costs incurred to date. (b) Costs incurred to date include $12.6 million and $1.2 million of accrued fixed assets for development and redevelopment, respectively. (c) Represents UDR’s proportionate share of expected remaining costs to complete. (d) Represents the participating loan balance funded as of December 31, 2015 . (e) Represents UDR’s remaining participating loan commitment for Steele Creek. (f) Represents UDR’s share of capital contributed to the West Coast Development Joint Venture as of December 31, 2015 . Ground and Other Leases UDR owns six communities which are subject to ground leases expiring between 2019 and 2103 . In addition, UDR is a lessee to various operating leases related to office space rented by the Company with expiration dates through 2017 . Future minimum lease payments as of December 31, 2015 are as follows (dollars in thousands): Ground Leases (a) Office Space 2016 $ 5,444 $ 207 2017 5,444 179 2018 5,444 76 2019 5,444 76 2020 4,486 76 Thereafter 311,858 32 Total $ 338,120 $ 646 (a) For purposes of our ground lease contracts, the Company uses the minimum lease payment, if stated in the agreement. For ground lease agreements where there is a reset provision based on the communities appraised value or consumer price index but does not include a specified minimum lease payment, the Company uses the current rent over the remainder of the lease term. UDR incurred $5.5 million , $5.4 million , and $5.2 million of ground rent expense for the years ended December 31, 2015 , 2014 , and 2013 , respectively. These costs are reported within the line item Other Operating Expenses on the Consolidated Statements of Operations. The Company incurred $0.3 million , $1.3 million , and $1.3 million of rent expense related to office space for the years ended December 31, 2015 , 2014 , and 2013 , respectively. These costs are included in General and Administrative on the Consolidated Statements of Operations. In February 2015, the Company acquired the office building in Highlands Ranch, Colorado, which housed its corporate offices it had previously leased. See Note 4, Real Estate Owned, for additional details. Contingencies Litigation and Legal Matters The Company is subject to various legal proceedings and claims arising in the ordinary course of business. The Company cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The Company believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on our financial condition, results of operations or cash flow.

Reportable Segments

Reportable Segments	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
REPORTABLE SEGMENTS	REPORTABLE SEGMENTS GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. UDR’s chief operating decision maker is comprised of several members of its executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments. UDR owns and operates multifamily apartment communities that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures for UDR’s apartment communities are rental income and NOI. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as rental income less direct property rental expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations, and land rent. UDR’s chief operating decision maker utilizes NOI as the key measure of segment profit or loss. UDR’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other : • Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2014 and held as of December 31, 2015 . A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior year, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months. • Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities , including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties. Management evaluates the performance of each of our apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Company’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker. All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of UDR’s total revenues during the years ended December 31, 2015 , 2014 , and 2013 . The following table details rental income and NOI from continuing and discontinued operations for UDR’s reportable segments for the years ended December 31, 2015 , 2014 , and 2013 , and reconciles NOI to Net income/(loss) attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Reportable apartment home segment rental income Same-Store Communities West Region $ 255,346 $ 236,175 $ 214,324 Mid-Atlantic Region 157,158 154,491 150,489 Southeast Region 103,920 98,061 93,479 Northeast Region 86,048 81,500 77,299 Southwest Region 57,670 54,810 52,302 Non-Mature Communities/Other 211,786 180,112 167,743 Total segment and consolidated rental income $ 871,928 $ 805,149 $ 755,636 Reportable apartment home segment NOI Same-Store Communities West Region $ 190,682 $ 171,973 $ 152,108 Mid-Atlantic Region 108,324 107,592 105,300 Southeast Region 69,820 65,053 61,087 Northeast Region 64,539 61,315 57,350 Southwest Region 35,767 33,725 31,925 Non-Mature Communities/Other 144,737 116,663 106,271 Total segment and consolidated NOI 613,869 556,321 514,041 Reconciling items: Joint venture management and other fees 22,710 13,044 12,442 Property management (23,978 ) (22,142 ) (20,780 ) Other operating expenses (9,708 ) (8,271 ) (7,136 ) Real estate depreciation and amortization (374,598 ) (358,154 ) (341,490 ) General and administrative (59,690 ) (47,800 ) (42,238 ) Casualty-related recoveries/(charges), net (2,335 ) (541 ) 12,253 Other depreciation and amortization (6,679 ) (5,775 ) (6,741 ) Income/(loss) from unconsolidated entities 62,329 (7,006 ) (415 ) Interest expense (121,875 ) (130,454 ) (126,083 ) Interest income and other income/(expense), net 1,551 11,837 4,681 Tax benefit/(provision), net 3,886 15,136 7,299 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,647 40,449 Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) (1,530 ) Net (income)/loss attributable to noncontrolling interests (3 ) 3 60 Net income/(loss) attributable to UDR, Inc. $ 340,383 $ 154,334 $ 44,812 The following table details the assets of UDR’s reportable segments as of December 31, 2015 and 2014 (dollars in thousands) : December 31, December 31, Reportable apartment home segment assets: Same-Store communities: West Region $ 2,371,615 $ 2,336,271 Mid-Atlantic Region 1,423,888 1,440,561 Southeast Region 730,060 727,933 Northeast Region 1,109,354 1,076,656 Southwest Region 450,305 440,587 Non-mature Communities/Other 3,105,054 2,361,251 Total segment assets 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Total segment assets — net book value 6,543,402 5,948,487 Reconciling items: Cash and cash equivalents 6,742 15,224 Restricted cash 20,798 22,340 Notes receivable, net 16,694 14,369 Investment in and advances to unconsolidated joint ventures, net 938,906 718,226 Other assets 137,302 110,082 Total consolidated assets $ 7,663,844 $ 6,828,728 Capital expenditures related to our Same-Store Communities totaled $72.3 million , $52.5 million , and $43.0 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $12.9 million , $10.9 million , and $12.8 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Markets included in the above geographic segments are as follows: i. West Region — Orange County, San Francisco, Seattle, Los Angeles, Monterey Peninsula, Other Southern California, and Portland ii. Mid-Atlantic Region — Metropolitan D.C., Baltimore, and Richmond iii. Southeast Region — Orlando, Nashville, Tampa and Other Florida iv. Northeast Region — New York and Boston v. Southwest Region — Dallas and Austin

Hurricane Related Charges

Hurricane Related Charges	12 Months Ended
	Dec. 31, 2015
Hurricane Related Charges [Abstract]
Hurricane Related Charges	-RELATED (RECOVERIES)/CHARGES During the year ended December 31, 2015, the Company recorded $2.3 million of casualty-related losses due to property damage caused by the severe snow storms on the east coast in early 2015 and water damage at a community, all of which are included in Casualty-related charges/(recoveries), net on the Consolidated Statements of Operations. During the year ended December 31, 2014, the Company recorded $0.5 million of casualty-related losses due to property damage incurred during an earthquake and a storm in California, all of which are included in Casualty-related charges/(recoveries), net on the Consolidated Statements of Operations. During the year ended December 31, 2013, the Company recorded $12.3 million of casualty-related recoveries related to damage caused by Hurricane Sandy on the east coast in October 2012, all of which are included in Casualty-related charges/(recoveries), net on the Consolidated Statements of Operations.

Unaudited Summarized Consolidat

Unaudited Summarized Consolidated Quarterly Financial Data	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA	UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA Selected consolidated quarterly financial data for the years ended December 31, 2015 and 2014 is summarized in the table below (dollars in thousands, except per share amounts) : Three Months Ended March 31, June 30, September 30, December 31, 2015 Rental income $ 207,047 $ 212,764 $ 217,765 $ 234,352 Income/(loss) from continuing operations 76,417 10,842 13,695 4,528 Net income/(loss) attributable to common stockholders (a) 72,891 85,924 12,361 161,270 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic $ 0.28 $ 0.33 $ 0.05 $ 0.62 Diluted $ 0.28 $ 0.33 $ 0.05 $ 0.61 Weighted average number of shares outstanding Basic 256,834 257,849 259,114 260,830 Diluted 258,662 262,806 261,207 266,108 2014 Rental income (b) $ 194,352 $ 200,959 $ 203,587 $ 206,104 Income/(loss) from continuing operations (5,195 ) 4,359 10,611 6,485 Income/(loss) from discontinued operations, net of tax (87 ) 18 79 — Net income/(loss) attributable to common stockholders (a) 17,430 29,076 39,618 64,486 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic and diluted $ 0.07 $ 0.12 $ 0.16 $ 0.25 Weighted average number of shares outstanding Basic 250,177 250,255 251,655 253,983 Diluted 251,822 252,191 253,732 256,000 (a) Due to the quarterly pro-rata calculation of noncontrolling interest and rounding, the sum of the quarterly per share and/or dollar amounts may not equal the annual totals. (b) Represents rental income from continuing operations, excluding amounts classified as discontinued operations.

Consolidation and Basis of Pr32

Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
CONSOLIDATION AND BASIS OF PRESENTATION	CONSOLIDATION AND BASIS OF PRESENTATION Organization and Formation UDR, Inc. (“UDR,” the “Company,” “we,” or “our”) is a self-administered real estate investment trust, or REIT, that owns, operates, acquires, renovates, develops, redevelops, and manages apartment communities generally in high barrier-to-entry markets located in the United States. The high barrier-to-entry markets are characterized by limited land for new construction, difficult and lengthy entitlement process, expensive single-family home prices and significant employment growth potential. At December 31, 2015 , our consolidated apartment portfolio consisted of 133 consolidated communities located in 18 markets consisting of 40,728 apartment homes. In addition, the Company has an ownership interest in 6,696 apartment homes through unconsolidated joint ventures. Basis of Presentation The accompanying consolidated financial statements of UDR include its wholly-owned and/or controlled subsidiaries (see the “Consolidated Joint Ventures” section of Note 5, Joint Ventures and Partnerships , for further discussion). All significant intercompany accounts and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current financial statement presentation. The accompanying consolidated financial statements include the accounts of UDR and its subsidiaries, including United Dominion Realty, L.P. (the “Operating Partnership” or the “OP”) and UDR Lighthouse DownREIT L.P. (the “DownREIT Partnership”). As of December 31, 2015 and 2014 , there were 183,278,698 units in the Operating Partnership (“OP Units”) outstanding, of which 174,225,399 or 95.1% and 174,113,225 or 95.0% , respectively, were owned by UDR and 9,053,299 or 4.9% and 9,165,473 or 5.0% , respectively, were owned by outside limited partners. As of December 31, 2015 , there were 32,367,380 units in the DownREIT Partnership (“DownREIT Units”) outstanding, of which 16,229,407 or 50.1% were owned by UDR (of which, 13,470,651 or 41.6% were held by the Operating Partnership) and 16,137,973 or 49.9% were owned by outside limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating Partnership and DownREIT Partnership. The Company evaluated subsequent events through the date its financial statements were issued. No significant recognized or non-recognized subsequent events were noted other than those mentioned in Note 4, Real Estate Owned and Note 6, Secured and Unsecured Debt, Net .
United Dominion Reality L.P.
Entity Information [Line Items]
CONSOLIDATION AND BASIS OF PRESENTATION	CONSOLIDATION AND BASIS OF PRESENTATION United Dominion Realty, L.P. (“UDR, L.P.,” the “Operating Partnership,” “we” or “our”) is a Delaware limited partnership that owns, acquires, renovates, redevelops, manages, and disposes of multifamily apartment communities generally located in high barrier to entry markets located in the United States. The high barrier to entry markets are characterized by limited land for new construction, difficult and lengthy entitlement process, expensive single-family home prices and significant employment growth potential. UDR, L.P. is a subsidiary of UDR, Inc. (“UDR” or the “General Partner”), a self-administered real estate investment trust, or REIT, through which UDR conducts a significant portion of its business. During the years ended December 31, 2015 , 2014 , and 2013 , rental revenues of the Operating Partnership represented 51% , 52% , and 54% , respectively, of the General Partner’s consolidated rental revenues (including those classified within discontinued operations). At December 31, 2015 , the Operating Partnership’s apartment portfolio consisted of 57 communities located in 14 markets consisting of 16,974 apartment homes. Interests in UDR, L.P. are represented by operating partnership units (“OP Units”). The Operating Partnership’s net income is allocated to the partners, which is initially based on their respective distributions made during the year and secondly, their percentage interests. Distributions are made in accordance with the terms of the Amended and Restated Agreement of Limited Partnership of United Dominion Realty, L.P. (the “Operating Partnership Agreement”), on a per unit basis that is generally equal to the dividend per share on UDR’s common stock, which is publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “UDR.” As of December 31, 2015 , there were 183,278,698 OP Units outstanding, of which 174,225,399 or 95.1% were owned by UDR and affiliated entities and 9,053,299 or 4.9% were owned by non-affiliated limited partners. There were 183,278,698 OP Units outstanding as of December 31, 2014 , of which 174,113,225 or 95.0% were owned by UDR and affiliated entities and 9,165,473 or 5.0% were owned by non-affiliated limited partners. As sole general partner of the Operating Partnership, UDR owned all 110,883 general partner OP units or 0.1% of the total OP Units outstanding as of December 31, 2015 and 2014 . At December 31, 2015 and 2014 , there were 183,167,815 limited partner OP Units outstanding, of which 1,873,332 were Class A Limited Partnership Units. Of the limited partner OP Units outstanding, UDR owned 174,114,516 or 95.1% and 174,002,342 or 95.0% at December 31, 2015 and 2014 , respectively. The remaining 9,053,299 or 4.9% and 9,165,473 or 5.0% of the limited partner OP Units outstanding were held by non-affiliated partners at December 31, 2015 and 2014 , respectively, of which 1,751,671 were Class A Limited Partnership units. See Note 10, Capital Structure . The Operating Partnership evaluated subsequent events through the date its financial statements were issued. No recognized or non-recognized subsequent events were noted.

Significant Accounting Polici33

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Recent Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , which incorporates a requirement that a disposition represent a strategic shift in an entity’s operations into the definition of a discontinued operation. In accordance with the ASU, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity. The standard requires prospective application and will be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. The early adoption provision excludes components of an entity that were sold or classified as held for sale prior to the adoption of the standard. The Company elected to early adopt this standard effective January 1, 2014, which had a significant impact on the Company’s consolidated financial statements as further discussed in Note 3, Discontinued Operations . Subsequent to the Company’s adoption of ASU 2014-08, the sale of real estate that does not meet the definition of a discontinued operation under the standard is included in Gain/(loss) on sale of real estate owned, net of tax on the Consolidated Statements of Operations. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method, and the standard will be effective for the Company on January 1, 2017; early adoption is not permitted. The Company has not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which makes changes to both the variable interest model and the voting model of consolidation. Under ASU 2015-02, companies will need to re-evaluate whether an entity meets the criteria to be considered a variable interest entity (“VIE”) or whether the consolidation of an entity should be assessed under the voting model. The new standard specifically eliminates the presumption in the current voting model that a general partner controls a limited partnership or similar entity unless that presumption can be overcome. The new standard will be effective for the Company beginning on January 1, 2016 and must be applied using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the period of adoption or retrospectively to each period presented. The Company does not expect the adoption of the new standard to result in the consolidation of entities not previously consolidated or the deconsolidation of any entities previously consolidated. Upon adopting the new standard, the Company expects that the Operating Partnership and DownREIT Partnership will become VIEs as the limited partners of both entities lack substantive kick-out rights and substantive participating rights. The Company expects to be the primary beneficiary of, and continue to consolidate, both entities. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. ASU 2015-03 did not directly address presentation or subsequent measurement of issuance costs related to line-of-credit arrangements. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , which clarifies that such costs may be presented as an asset and subsequently amortized over the term of the line-of-credit arrangement. The cumulative guidance, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. The Company elected to early adopt ASU 2015-03 and ASU 2015-15 during the fourth quarter of 2015. As a result, for all periods presented, deferred financing costs related to secured and unsecured debt are included as reductions to Secured debt, net and Unsecured debt, net , respectively, on the accompanying Consolidated Balance Sheets and deferred financing costs related to revolving credit facilities are included within Other assets on the accompanying Consolidated Balance Sheets. At December 31, 2015, $7.9 million , $5.5 million and $12.4 million of deferred financing costs were included within Other assets , Secured debt, net , and Unsecured debt, net , respectively. At December 31, 2014, the following amounts of deferred financing costs were reclassified ( in thousands ): Deferred financing costs Other assets Secured debt, net Unsecured Debt, net December 31, 2014 As previously presented $ 22,686 $ 105,202 $ 1,361,529 $ 2,221,576 Reclassification of deferred financing costs (22,686 ) 4,880 (7,208 ) (10,598 ) As presented herein $ — $ 110,082 $ 1,354,321 $ 2,210,978 In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments , which requires that the cumulative impact of a measurement-period adjustment, including impacts on prior periods, be recognized in the reporting period in which the adjustment amount is determined and, therefore, eliminates the requirement to retrospectively account for the adjustment in prior periods presented. The new standard will be effective for the Company beginning on January 1, 2016 and must be applied prospectively to measurement-period adjustments that occur after the effective date. The Company will comply with the new guidance upon adoption. Real Estate Real estate assets held for investment are carried at historical cost and consist of land, buildings and improvements, furniture, fixtures and equipment and other costs incurred during their development, acquisition and redevelopment. Expenditures for ordinary repair and maintenance costs are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to the acquisition and/or improvement of real estate assets are capitalized and depreciated over their estimated useful lives if the expenditures qualify as a betterment or the life of the related asset will be substantially extended beyond the original life expectancy. UDR purchases real estate investment properties and records the tangible and identifiable intangible assets and liabilities acquired based on their estimated fair value. The primary, although not only, identifiable intangible asset associated with our portfolio is the value of existing lease agreements. When recording the acquisition of a community, we first assign fair value to the estimated intangible value of the existing lease agreements and then to the estimated value of the land, building and fixtures assuming the community is vacant. The Company estimates the intangible value of the lease agreements by determining the lost revenue associated with a hypothetical lease-up. Depreciation on the building is based on the expected useful life of the asset and the in-place leases are amortized over their remaining average contractual life. Property acquisition costs are expensed as incurred. Quarterly or when changes in circumstances warrant, UDR will assess our real estate properties for indicators of impairment. In determining whether the Company has indicators of impairment in our real estate assets, we assess whether the long-lived asset’s carrying value exceeds the community’s undiscounted future cash flows, which is representative of projected net operating income (“NOI”) plus the residual value of the community. Our future cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. If such indicators of impairment are present and the carrying value exceeds the undiscounted cash flows of the community, an impairment loss is recognized equal to the excess of the carrying amount of the asset over its estimated fair value. Our estimates of fair market value represent our best estimate based primarily upon unobservable inputs related to rental rates, operating costs, growth rates, discount rates, capitalization rates, industry trends and reference to market rates and transactions. For long-lived assets to be disposed of, impairment losses are recognized when the fair value of the asset less estimated cost to sell is less than the carrying value of the asset. Properties classified as real estate held for sale generally represent properties that are actively marketed or contracted for sale with the closing expected to occur within the next twelve months. Real estate held for sale is carried at the lower of cost, net of accumulated depreciation, or fair value, less the cost to sell, determined on an asset-by-asset basis. Expenditures for ordinary repair and maintenance costs on held for sale properties are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to held for sale properties are capitalized at cost. Depreciation is not recorded on real estate held for sale. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets which are 35 to 55 years for buildings, 10 to 35 years for major improvements, and 3 to 10 years for furniture, fixtures, equipment, and other assets. Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation . The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, for the years ended December 31, 2015 , 2014 , and 2013 were $6.3 million , $9.0 million and $11.1 million , respectively. During the years ended December 31, 2015 , 2014 , and 2013 , total interest capitalized was $16.1 million , $20.2 million , and $29.4 million , respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life. Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, demand deposits with financial institutions and short-term, highly liquid investments. We consider all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The majority of the Company’s cash and cash equivalents are held at major commercial banks. Restricted Cash Restricted cash consists of escrow deposits held by lenders for real estate taxes, insurance and replacement reserves, and security deposits. Revenue and Real Estate Sales Gain Recognition Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable. For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value. Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property. Notes Receivable The following table summarizes our notes receivable, net as of December 31, 2015 and 2014 ( dollars in thousands ): Interest rate at Balance Outstanding December 31, December 31, December 31, Note due February 2017 (a) 10.00 % $ 12,994 $ 11,869 Note due July 2017 (b) 8.00 % 2,500 2,500 Note due October 2020 (c) 8.00 % 1,200 — Total notes receivable, net $ 16,694 $ 14,369 (a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million , which bears an interest rate of 10.00% per annum. During the year ended December 31, 2015, the Company loaned an additional $1.1 million . Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (February 2017). (b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million , which bears an interest rate of 8.00% per annum. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017). (c) In October 2015, the Company entered into a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million , which bears an interest rate of 8.00% per annum. During the year ended December 31, 2015 , the Company loaned $1.2 million under the note. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020). During the years ended December 31, 2015 , 2014 , and 2013 , the Company recognized $1.5 million , $3.4 million and $4.1 million , respectively, of interest income from notes receivable, of which $0.0 , $0.0 and $0.8 million , respectively, was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations. Investment in Joint Ventures and Partnerships We use the equity method to account for investments in joint ventures and partnerships that qualify as variable interest entities where we are not the primary beneficiary and other entities that we do not control or where we do not own a majority of the economic interest but have the ability to exercise significant influence over the operating and financial policies of the investee. Throughout these financial statements we use the term “joint venture” or “partnership” when referring to investments in entities in which we do not have a 100% ownership interest. The Company also uses the equity method when we function as the managing partner and our venture partner has substantive participating rights or where we can be replaced by our venture partner as managing partner without cause. For a joint venture or partnership accounted for under the equity method, our share of net earnings or losses is reflected as income/loss when earned/incurred and distributions are credited against our investment in the joint venture or partnership as received. In determining whether a joint venture or partnership is a variable interest entity, the Company considers: the form of our ownership interest and legal structure; the size of our investment; the financing structure of the entity, including necessity of subordinated debt; estimates of future cash flows; ours and our partner’s ability to participate in the decision making related to acquisitions, disposition, budgeting and financing of the entity; obligation to absorb losses and preferential returns; nature of our partner’s primary operations; and the degree, if any, of disproportionality between the economic and voting interests of the entity. As of December 31, 2015 , the Company did not determine any of our joint ventures or partnerships to be variable interest entities. We evaluate our investments in unconsolidated joint ventures for events or changes in circumstances that indicate there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, the fair value of the property of the joint venture, and the relationships with the other joint venture partners and its lenders. The amount of loss recognized is the excess of the investment’s carrying amount over its estimated fair value. If we believe that the decline in fair value is temporary, no impairment is recorded. The aforementioned factors are taken into consideration as a whole by management in determining the valuation of our equity method investments. Should the actual results differ from management’s judgment, the valuation could be negatively affected and may result in a negative impact to our Consolidated Financial Statements. Derivative Financial Instruments The Company utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. Derivative financial instruments are recorded on our Consolidated Balance Sheets as either an asset or liability and measured quarterly at their fair value. The changes in fair value for cash flow hedges that are deemed effective are reflected in other comprehensive income/(loss) and for non-designated derivative financial instruments in earnings. The ineffective component of cash flow hedges, if any, is recorded in earnings. Redeemable Noncontrolling Interests in the Operating Partnership and DownREIT Partnership Interests in the Operating Partnership and the DownREIT Partnership held by limited partners are represented by OP Units and DownREIT Units, respectively. The income is allocated to holders of OP Units/DownREIT Units based upon net income available to common stockholders and the weighted average number of OP Units/DownREIT Units outstanding to total common shares plus OP Units/DownREIT Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the partnership agreements of the Operating Partnership and the DownREIT Partnership. Limited partners of the Operating Partnership and the DownREIT Partnership have the right to require such partnership to redeem all or a portion of the OP Units/DownREIT Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable), provided that such OP Units/DownREIT Units have been outstanding for at least one year. UDR, as the general partner of the Operating Partnership and the DownREIT Partnership may, in its sole discretion, purchase the OP Units/DownREIT Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of Common Stock of the Company for each OP Unit/DownREIT Unit), as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable. Accordingly, the Company records the OP Units outside of permanent equity and reports the OP Units at their redemption value using the Company’s stock price at each balance sheet date. Income Taxes Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”). Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of December 31, 2015 and 2014 , UDR’s net deferred tax asset of $11.8 million , net of valuation allowance of $0.1 million , and $7.0 million , which had no valuation allowance, respectively, was included in Other assets on the Consolidated Balance Sheets. GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition. The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely tha n not (greater than 50 percent probability) to b e sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement. UDR had no material unrecognized tax benefit, accrued interest or penalties at December 31, 2015 . UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2011 through 2014 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in income tax expense. Discontinued Operations Prior to the adoption of ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , the results of operations for those properties sold during the year or classified as held for sale at the end of the current year were classified as discontinued operations in the current and prior periods. Further, to meet the discontinued operations criteria, the Company will not have any significant continuing involvement in the ownership or operation of the property after the sale or disposition. Once a property is classified as held for sale, depreciation is no longer recorded. However, if the Company determines that the property no longer meets the criteria for held for sale, the Company will recapture any unrecorded depreciation on the property. The assets and liabilities, if any, of properties classified as held for sale are presented separately on the Consolidated Balance Sheets at the lower of their carrying amount or their estimated fair value less the costs to sell the assets. (See Note 3, Discontinued Operations and Assets Held for Sale, for further discussion). Stock-Based Employee Compensation Plans The Company measures the cost of employee services received in exchange for an award of an equity instrument based on the award’s fair value on the grant date and recognizes the cost over the period during which the employee is required to provide service in exchange for the award, which is generally the vesting period. The fair value for stock options issued by the Company is calculated utilizing the Black-Scholes-Merton formula. For performance based awards, the Company remeasures the fair value each balance sheet date with adjustments made on a cumulative basis until the award is settled and the final compensation is known. The fair value for market based awards issued by the Company is calculated utilizing a Monte Carlo simulation. For further discussion, see Note 9, Employee Benefit Plans. Advertising Costs All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item General and administrative . During the years ended December 31, 2015 , 2014 , and 2013 , total advertising expense was $6.4 million , $6.0 million , and $5.7 million , respectively. Cost of Raising Capital Costs incurred in connection with the issuance of equity securities are deducted from stockholders’ equity. Costs incurred in connection with the issuance or renewal of debt are recorded based on the terms of the debt issuance or renewal. Accordingly, if the terms of the renewed or modified debt instrument are deemed to be substantially different (i.e. a 10 percent or greater difference in the cash flows between instruments), all unamortized financing costs associated with the extinguished debt are charged to earnings in the current period and certain costs of new debt issuances are capitalized and amortized over the term of the debt. When the cash flows are not substantially different, the lender costs associated with the renewal or modification are capitalized and amortized into interest expense over the remaining term of the related debt instrument and other related costs are expensed. The balance of any unamortized financing costs associated with retired debt is expensed upon retirement. Deferred financing costs for new debt instruments include fees and costs incurred by the Company to obtain financing. Deferred financing costs are generally amortized on a straight-line basis, which approximates the effective interest method, over a period not to exceed the term of the related debt. Comprehensive Income/(Loss) Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the years ended December 31, 2015 , 2014 , and 2013 , the Company's other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments and marketable securities reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to redeemable noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in interest expense in the accompanying Consolidated Statements of Operations. See Note 13, Derivatives and Hedging Activity, for further discussion. The (gain)/loss on marketable securities reclassified from other comprehensive income/(loss) is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the years ended December 31, 2015 , 2014 , and 2013 was $(0.3) million , $(0.1) million , and $0.3 million , respectively. Use of Estimates The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. Market Concentration Risk The Company is subject to increased exposure from economic and other competitive factors specific to markets where the Company holds a significant percentage of the carrying value of its real estate portfolio. At December 31, 2015 , the Company held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; Metropolitan D.C.; and New York, New York markets.
United Dominion Reality L.P.
Entity Information [Line Items]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Recent Accounting Pronouncements In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , which incorporates a requirement that a disposition represent a strategic shift in an entity’s operations into the definition of a discontinued operation. In accordance with the ASU, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity. The standard requires prospective application and will be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. The early adoption provision excludes components of an entity that were sold or classified as held for sale prior to the adoption of the standard. The Operating Partnership elected to early adopt this standard effective January 1, 2014, which had a significant impact on the Operating Partnership’s consolidated financial statements as further discussed in Note 3, Discontinued Operations . Subsequent to the Operating Partnership’s adoption of ASU 2014-08, the sale of real estate that does not meet the definition of a discontinued operation under the standard is included in Gain/(loss) on sale of real estate owned, net of tax on the Consolidated Statements of Operations. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method, and the standard will be effective for the Operating Partnership on January 1, 2017; early adoption is not permitted. The Operating Partnership has not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which makes changes to both the variable interest model and the voting model of consolidation. Under ASU 2015-02, companies will need to re-evaluate whether an entity meets the criteria to be considered a variable interest entity (“VIE”) or whether the consolidation of an entity should be assessed under the voting model. The new standard specifically eliminates the presumption in the current voting model that a general partner controls a limited partnership or similar entity unless that presumption can be overcome. The new standard will be effective for the Operating Partnership beginning on January 1, 2016 and must be applied using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the period of adoption or retrospectively to each period presented. The Operating Partnership does not expect the adoption of the new standard to result in the consolidation of entities not previously consolidated or the deconsolidation of any entities previously consolidated. Upon adopting the new standard, the Operating Partnership expects that the DownREIT Partnership will become a VIE as the limited partners lack substantive kick-out rights and substantive participating rights. The Operating Partnership does not expect to be the primary beneficiary of the DownREIT Partnership and will continue to record its interest as an equity method investment. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. ASU 2015-03 does not directly address presentation or subsequent measurement of issuance costs related to line-of-credit arrangements. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , which clarifies that such costs may be presented as an asset and subsequently amortized over the term of the line-of-credit arrangement. The cumulative guidance, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. The Operating Partnership elected to early adopt ASU 2015-03 and ASU 2015-15 during the fourth quarter of 2015. As a result, at December 31, 2015 and 2014, deferred financing costs of $2.2 million and $4.5 million , respectively, are included as a reduction to Secured debt, net on the accompanying Consolidated Balance Sheets. At December 31, 2014, Secured debt, net previously disclosed as $932.0 million has been adjusted to $927.5 million in the accompanying Consolidated Balance Sheets. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments , which requires that the cumulative impact of a measurement-period adjustment, including impacts on prior periods, be recognized in the reporting period in which the adjustment amount is determined and, therefore, eliminates the requirement to retrospectively account for the adjustment in prior periods presented. The new standard will be effective for the Operating Partnership beginning on January 1, 2016 and must be applied prospectively to measurement-period adjustments that occur after the effective date. The Operating Partnership will comply with the new guidance upon adoption. Real Estate Real estate assets held for investment are carried at historical cost and consist of land, buildings and improvements, furniture, fixtures and equipment and other costs incurred during their development, acquisition and redevelopment. Expenditures for ordinary repair and maintenance costs are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to the acquisition and/or improvement of real estate assets are capitalized and depreciated over their estimated useful lives if the expenditures qualify as a betterment or the life of the related asset will be substantially extended beyond the original life expectancy. The Operating Partnership purchases real estate investment properties and records the tangible and identifiable intangible assets and liabilities acquired based on their estimated fair value. The primary, although not only, identifiable intangible asset associated with our portfolio is the value of existing lease agreements. When recording the acquisition of a community, we first assign fair value to the estimated intangible value of the existing lease agreements and then to the estimated value of the land, building and fixtures assuming the community is vacant. The Operating Partnership estimates the intangible value of the lease agreements by determining the lost revenue associated with a hypothetical lease-up. Depreciation on the building is based on the expected useful life of the asset and the in-place leases are amortized over their remaining average contractual life. Property acquisition costs are expensed as incurred. Quarterly or when changes in circumstances warrant, the Operating Partnership will assess our real estate properties for indicators of impairment. In determining whether the Operating Partnership has indicators of impairment in our real estate assets, we assess whether the long-lived asset’s carrying value exceeds the community’s undiscounted future cash flows, which is representative of projected net operating income (“NOI”) plus the residual value of the community. Our future cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. If such indicators of impairment are present and the carrying value exceeds the undiscounted cash flows of the community, an impairment loss is recognized equal to the excess of the carrying amount of the asset over its estimated fair value. Our estimates of fair market value represent our best estimate based primarily upon unobservable inputs related to rental rates, operating costs, growth rates, discount rates and capitalization rates, industry trends and reference to market rates and transactions. For long-lived assets to be disposed of, impairment losses are recognized when the fair value of the asset less estimated cost to sell is less than the carrying value of the asset. Properties classified as real estate held for sale generally represent properties that are actively marketed or contracted for sale with the closing expected to occur within the next twelve months. Real estate held for sale is carried at the lower of cost, net of accumulated depreciation, or fair value, less the cost to sell, determined on an asset-by-asset basis. Expenditures for ordinary repair and maintenance costs on held for sale properties are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to held for sale properties are capitalized at cost. Depreciation is not recorded on real estate held for sale. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets which are 35 to 55 years for buildings, 10 to 35 years for major improvements, and 3 to 10 years for furniture, fixtures, equipment, and other assets. Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation . The Operating Partnership capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, for the years ended December 31, 2015 , 2014 , and 2013 were $0.7 million , $2.0 million , and $2.5 million , respectively. During the years ended December 31, 2015 , 2014 , and 2013 , total interest capitalized was $0.2 million , $2.9 million , and $5.9 million , respectively. As each home in a capital project is completed and becomes available for lease-up, the Operating Partnership ceases capitalization on the related portion and depreciation commences over the estimated useful life. Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, demand deposits with financial institutions and short-term, highly liquid investments. We consider all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The majority of the Operating Partnership’s cash and cash equivalents are held at major commercial banks. Restricted Cash Restricted cash consists of escrow deposits held by lenders for real estate taxes, insurance and replacement reserves, and security deposits. Revenue and Real Estate Sales Gain Recognition Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Operating Partnership recognizes interest income, management and other fees and incentives when earned, fixed and determinable. For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value. Sales to entities in which we or our General Partner retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we or our General Partner retain. The Operating Partnership recognizes any deferred gain when the property is sold to a third party. In transactions accounted by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property. Derivative Financial Instruments The General Partner utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. Derivative financial instruments associated with the Operating Partnership’s allocation of the General Partner’s debt are recorded on our Consolidated Balance Sheets as either an asset or liability and measured quarterly at their fair value. The changes in fair value for the General Partner’s cash flow hedges allocated to the Operating Partnership that are deemed effective are reflected in other comprehensive income and for non-designated derivative financial instruments in earnings. The ineffective component of cash flow hedges, if any, is recorded in earnings. Noncontrolling Interests The noncontrolling interests represent the General Partner’s interests in certain consolidated subsidiaries and are presented in the capital section of the Consolidated Balance Sheets since these interests are not convertible or redeemable into any other ownership interests of the Operating Partnership. During the year ended December 31, 2013, the Operating Partnership corrected an error in the General Partner’s ownership interest in one of the consolidated subsidiaries. The correction increased the General Partner’s ownership interest resulting in a cumulative adjustment increasing Net (income)/loss attributable to noncontrolling interests by $3.3 million on the Consolidated Statements of Operations with a corresponding increase to Noncontrolling interests on the Consolidated Balance Sheets. Management believes the impact of the cumulative adjustment in 2013 is immaterial to the financial statements taken as a whole. Income Taxes The taxable income or loss of the Operating Partnership is reported on the tax returns of the partners. Accordingly, no provision has been made in the accompanying financial statements for federal or state income taxes on income that is passed through to the partners. However, any state or local revenue, excise or franchise taxes that result from the operating activities of the Operating Partnership are recorded at the entity level. The Operating Partnership’s tax returns are subject to examination by federal and state taxing authorities. Net income for financial reporting purposes differs from the net income for income tax reporting purposes primarily due to temporary differences, principally real estate depreciation and the tax deferral of certain gains on property sales. The differences in depreciation result from differences in the book and tax basis of certain real estate assets and the differences in the methods of depreciation and lives of the real estate assets. The Operating Partnership follows the accounting guidance within GAAP, with respect to how uncertain tax positions should be recognized, measured, presented, and disclosed in the financial statements. The guidance requires the accounting and disclosure of tax positions taken or expected to be taken in the course of preparing the Operating Partnership’s tax returns to determine whether the tax positions are “more-likely-than-not” of being sustained by the applicable tax authority. Tax positions not deemed to meet the more-likely-than-not threshold would be recorded as a tax benefit or expense in the current year. Management of the Operating Partnership is required to analyze all open tax years, as defined by the statute of limitations, for all major jurisdictions, which include federal and certain states. The Operating Partnership has no examinations in progress and none are expected at this time. Management of the Operating Partnership has reviewed all open tax years (2011 through 2014) and major jurisdictions, and concluded there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns. Discontinued Operations Prior to the adoption of ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , the results of operations for those properties sold during the year or classified as held for sale at the end of the current year were classified as discontinued operations in the current and prior periods. Further, to meet the discontinued operations criteria, the Operating Partnership or related parties will not have any significant continuing involvement in the ownership or operation of the property after the sale or disposition. Once a property is classified as held for sale, depreciation is no longer recorded. However, if the Operating Partnership determines that the property no longer meets the criteria for held for sale, the Operating Partnership will recapture any unrecorded depreciation on the property. The assets and liabilities, if any, of properties classified as held for sale are presented separately on the Consolidated Balance Sheets at lower of their carrying amount or their estimated fair value less the costs to sell the assets. (See Note 3, Discontinued Operations and Assets Held for Sale, for further discussion). Allocation of General and Administrative Expenses The Operating Partnership is charged directly for general and administrative expenses it incurs. The Operating Partnership is also charged with other general and administrative expenses that have been allocated by the General Partner to each of its subsidiaries, including the Operating Partnership, based on each subsidiary’s pro-rata portion of UDR’s total apartment homes. (See Note 7, Related Party Transactions .) Advertising Costs All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item General and administrative . During the years ended December 31, 2015 , 2014 , and 2013 , total advertising expense from continuing and discontinued operations was $2.4 million , $2.5 million , and $2.5 million , respectively. Comprehensive Income/(Loss) Comprehensive income/(loss), which is defined as the change in capital during each period from transactions and other events and circumstances from nonowner sources, including all changes in capital during a period except for those resulting from investments by or distributions to partners, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the years ended December 31, 2015 , 2014 , and 2013 , the Operating Partnership’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges and (gain)/loss reclassified from other comprehensive income/(loss) into earnings. The (gain)/loss reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 9, Derivatives and Hedging Activity, for further discussion. Use of Estimates The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates. Market Concentration Risk The Operating Partnership is subject to increased exposure from economic and other competitive factors specific to those markets where it holds a significant percentage of the carrying value of its real estate portfolio at December 31, 2015 , the Operating Partnership held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; San Francisco, California; and New York, New York markets.

Discontinued Operations (UNITED

Discontinued Operations (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
United Dominion Reality L.P.
Entity Information [Line Items]
DISCONTINUED OPERATIONS	DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE Effective January 1, 2014, UDR, L.P. prospectively adopted ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , for all communities not previously sold or classified as held for sale. The standard had a material impact on the Operating Partnership’s consolidated financial statements. As a result of adopting the ASU, during the year ended December 31, 2014 , gains, net of tax, of $62.5 million from disposition of real estate, excluding a $1.1 million gain related to the sale of land, are included in Gain/(loss) on sale of real estate owned on the Consolidated Statements of Operations rather than in Income/(loss) from discontinued operations on the Consolidated Statements of Operations. Prior to the prospective adoption of ASU 2014-08, FASB Accounting Standards Codification ("ASC") Subtopic 205-20 required, among other things, that the primary assets and liabilities and the results of operations of the Operating Partnership’s real properties that have been sold or are held for disposition, be classified as discontinued operations and segregated in UDR, L.P.’s Consolidated Statements of Operations and Consolidated Balance Sheets. Consequently, the primary assets and liabilities and the net operating results of those properties sold or classified as held for disposition prior to January 1, 2014 are accounted for as discontinued operations for all periods presented. This presentation does not have an impact on net income available to common stockholders; it only results in the reclassification of the operating results within the Consolidated Statements of Operations for the periods ended December 31, 2015, 2014, and 2013. During the year ended December 31, 2013, the Operating Partnership sold two communities in the Sacramento market with 914 apartment homes for gross proceeds of $81.1 million . At December 31, 2015 and 2014, the Operating Partnership had no communities that met the criteria to be classified as held for sale and included in Income/(loss) from discontinued operations on the Consolidated Statements of Operations. During the years ended December 31, 2015, 2014, and 2013, the Operating Partnership recognized net gain/(loss) on the sale of depreciable properties of $0.0 , $0.0 , and $41.5 million , respectively, in Income/(loss) from discontinued operations on the Consolidated Statements of Operations. The following is a summary of income from discontinued operations for the years ended December 31, 2015, 2014, and 2013 ( dollars in thousands ): Year Ended December 31, 2015 2014 2013 Rental income $ — $ — $ 8,989 Rental expenses — — 3,149 Property management — — 247 Real estate depreciation — — 1,935 Income/(loss) attributable to disposed properties — — 3,658 Net gain/(loss) on the sale of depreciable properties — — 41,518 Income/(loss) from discontinued operations $ — $ — $ 45,176

Real Estate Owned (UNITED DOMIN

Real Estate Owned (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
REAL ESTATE OWNED	REAL ESTATE OWNED Real estate assets owned by the Company consist of income producing operating properties, properties under development, land held for future development, and sold or held for sale properties. As of December 31, 2015 , the Company owned and consolidated 133 communities in 10 states plus the District of Columbia totaling 40,728 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2015 and 2014 (dollars in thousands): December 31, December 31, 2014 Land $ 1,833,156 $ 1,790,281 Depreciable property — held and used: Land improvements 173,821 189,940 Building, improvements, and furniture, fixtures and equipment 7,046,622 6,225,406 Under development: Land 78,085 24,584 Building, improvements, and furniture, fixtures and equipment 45,987 153,048 Real estate held for disposition: Land 9,963 — Building, improvements, and furniture, fixtures and equipment 2,642 — Real estate owned 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Real estate owned, net $ 6,543,402 $ 5,948,487 Acquisitions In October 2015, the Company completed the acquisition of six Washington, D.C. area properties from Home Properties, L.P., a New York limited partnership (“Home OP”), for a total contractual purchase price of $900.6 million , which was comprised of $564.8 million of newly issued units of limited partnership interest (“DownREIT Units”) in the newly formed DownREIT Partnership issued at $35 per unit (a total of 16.1 million units), the assumption of $89.3 million of debt, $221.0 million of reverse tax-deferred like-kind exchanges under Section 1031 of the Internal Revenue Code of 1986 (“Section 1031 exchanges”), and $25.5 million of cash. In addition, the Company issued approximately 14.0 million shares of its Series F Preferred Stock to former limited partners of Home OP, which had the right to subscribe for one share of Series F Preferred Stock for each DownREIT Unit issued in connection with the acquisitions. The Company holds a 50.1% controlling ownership interest in, and consolidates, the DownREIT Partnership. See Note 11, Noncontrolling Interests , for additional information regarding the DownREIT Partnership formation and the Company’s controlling rights in the partnership. Of the six properties acquired from Home OP, four were acquired through the DownREIT Partnership, one was acquired by the Company through a reverse Section 1031 exchange and one was acquired by the Operating Partnership through a reverse Section 1031 exchange, as reflected in the following table: Property Location Eleven55 Ripley (a) Silver Spring, MD Arbor Park of Alexandria (a) Alexandria, VA Newport Village (a) Alexandria, VA The Courts at Dulles (a) Herndon, VA 1200 East West (b) Silver Spring, MD Courts at Huntington Station (c) Alexandria, VA (a) Acquired through the DownREIT Partnership. (b) Acquired by the Company through a reverse Section 1031 exchange. (c) Acquired by the Operating Partnership through a reverse Section 1031 exchange. The Company has performed a valuation analysis of the fair market value of the assets and liabilities of the properties acquired from Home OP. The following table summarizes the allocation of the purchase price as of the acquisition date ( in thousands ): Assets: Land $ 173,924 Buildings 708,455 Intangible assets 25,455 Total assets 907,834 Liabilities: Secured debt (96,486 ) Below-market in-place leases (542 ) Total liabilities (97,028 ) Total assets acquired less liabilities assumed $ 810,806 Substantially all acquired intangible assets will be amortized in 2016 based on the average term of acquired leases of 14 months or less. The Company’s results of operations include operating revenues of $15.6 million and net loss from continuing operations of $9.2 million related to the six Washington, D.C. area properties acquired from Home OP from the acquisition date to December 31, 2015. The unaudited pro forma information below summarizes the Company’s combined results of operations for the years ended December 31, 2015 and 2014 as though the above acquisition was completed on January 1, 2014. The information for the year ended December 31, 2015 includes pro forma results for the portion of the period prior to the acquisition date and actual results from the date of acquisition through the end of the period. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the Company’s results of operations for future periods ( in thousands ): Year Ended December 31, 2015 2014 Pro forma revenues $ 943,421 $ 877,287 Pro forma net income/(loss) attributable to common stockholders $ 319,385 $ 105,875 In February 2015, the Company acquired an office building in Highlands Ranch, Colorado, for total consideration of approximately $24.0 million , which was comprised of assumed debt. The Company’s corporate offices, as well as other leased office space, are located in the acquired building. The building consists of approximately 120,000 square feet. All existing leases were assumed by the Company at the time of the acquisition. In 2014, the Company acquired a fully-entitled land parcel for future development located in Huntington Beach, California for $77.8 million , two communities, located in Seattle, Washington and Kirkland, Washington, with a total of 358 apartment homes for $45.5 million and $75.2 million , respectively, and a land parcel for future development located in Boston, Massachusetts for $32.2 million . The four acquisitions during the year ended December 31, 2014 were accomplished through tax-deferred Section 1031 exchanges. The Company incurred $2.1 million , $0.4 million and $0.1 million of acquisition-related costs during the years ended December 31, 2015 , 2014 , and 2013 , respectively. These expenses are reported within the line item General and Administrative on the Consolidated Statements of Operations. Dispositions During the year ended December 31, 2015 , the Company sold 12 communities with a total of 2,735 apartment homes for gross proceeds of $408.7 million , resulting in net proceeds of $387.7 million and a total gain of $251.7 million . A portion of the sale proceeds was designated for tax-deferred Section 1031 exchanges for a 2014 acquisition and the October 2015 acquisitions. During the year ended December 31, 2014, the Company sold nine communities consisting of a total of 2,500 apartment homes, an adjacent parcel of land, and one operating property for gross proceeds of $328.4 million , resulting in net proceeds of $324.4 million and a total gain, net of tax, of $138.6 million . A portion of the sale proceeds was designated for tax-deferred Section 1031 exchanges that was used to fund acquisitions of real estate as discussed above. In December 2014, the Company sold a 49% interest in 13th and Market and a 50% interest in 3033 Wilshire to MetLife for approximately $54.2 million and $8.3 million , respectively, and recognized, net of tax, a gain of $7.2 million and a loss of $2.2 million , respectively. Subsequent to the sale, the two communities are accounted for under the equity method of accounting and are included in Investment in and advances to unconsolidated joint ventures, net on the Consolidated Balance Sheets. See further discussion of this transaction in Note 5, Joint Ventures and Partnerships . The activity of the two communities prior to sale is classified as a component of continuing operations on the Consolidated Statements of Operations. In February 2016, the Company sold a parcel of land located in Santa Monica, California for net proceeds of approximately $9.6 million and a net gain of approximately $2.1 million . In December 2015, the Company received a nonrefundable deposit on the pending sale of a parcel of land located in Santa Monica, California. The asset is included in Real estate held for disposition on the Consolidated Balance Sheets as of December 31, 2015. The sale is expected to close in March 2016 at a gross sales price of $13.5 million .
United Dominion Reality L.P.
Entity Information [Line Items]
REAL ESTATE OWNED	REAL ESTATE OWNED Real estate assets owned by the Operating Partnership consists of income producing operating properties, properties under development, land held for future development, and sold or held for sale properties. At December 31, 2015 , the Operating Partnership owned and consolidated 57 communities in eight states plus the District of Columbia totaling 16,974 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2015 and 2014 (dollars in thousands): December 31, December 31, 2014 Land $ 833,300 $ 1,008,014 Depreciable property — held and used: Buildings, improvements, and furniture, fixtures and equipment 2,797,605 3,230,756 Real estate owned 3,630,905 4,238,770 Accumulated depreciation (1,281,258 ) (1,403,303 ) Real estate owned, net $ 2,349,647 $ 2,835,467 Acquisitions In October 2015, the Operating Partnership acquired one community in Alexandria, Virginia with 421 apartment homes for a purchase price of $142.0 million , which was funded through reverse tax-deferred like-kind exchanges under Section 1031 of the Internal Revenue Code of 1986 (“Section 1031 exchanges”). The Operating Partnership performed a valuation analysis of the fair market value of the assets and liabilities of the acquired community as of the acquisition date. The following table summarizes the allocation of the purchase price ( in thousands ): Land $ 27,749 Buildings 111,878 Intangible assets 2,373 Total assets acquired $ 142,000 Substantially all acquired intangible assets will be amortized in 2016 based on the average term of acquired leases of 14 months or less. The Operating Partnership did not have any acquisitions during the year ended December 31, 2014 . Dispositions In connection with the formation of the DownREIT Partnership in October 2015, the Operating Partnership contributed seven operating communities to the DownREIT Partnership. The Operating Partnership recorded its contribution to the DownREIT Partnership at book value and consequently deferred a gain of $296.4 million . As a result of the contribution, the Operating Partnership lost its controlling interest and deconsolidated the seven operating communities. The Operating Partnership accounts for its investment in the DownREIT Partnership under the equity method of accounting as described in Note 5, Unconsolidated Entities . The following table summarizes the impact of the deconsolidation of the contributed assets on the Consolidated Balance Sheet at December 31, 2015 ( in thousands ): Assets Real estate held for investment $ (628,479 ) Accumulated depreciation 223,363 Real estate held for investment, net (405,116 ) Cash and cash equivalents (140 ) Other assets (1,680 ) Total assets $ (406,936 ) Liabilities Secured debt, net $ (228,390 ) Real estate taxes payable (4,123 ) Accounts payable, accrued expenses, and other liabilities (5,781 ) Total liabilities $ (238,294 ) As described in Note 5, Unconsolidated Entities , the Operating Partnership accounts for its interest in the DownREIT Partnership, including the seven contributed properties, as an equity method investment. During the year ended December 31, 2015 , the Operating Partnership sold five communities with a total of 1,149 apartment homes for gross proceeds of $250.9 million , resulting in net proceeds of $232.4 million and a total gain, net of tax, of $133.5 million . A portion of the sale proceeds were designated for Section 1031 exchanges for the October 2015 acquisition described above. Additionally, the Operating Partnership recognized a gain of $24.6 million , which was previously deferred, in connection with the sale of the communities held by the Texas joint venture in January 2015. During the year ended December 31, 2014 , the Operating Partnership sold one community and an adjacent parcel of land in San Diego, California for gross proceeds of $48.7 million , resulting in a $24.4 million gain and net proceeds of $47.9 million . The Operating Partnership also recorded a gain of $39.2 million in connection with the sale of two communities, one in Tampa, Florida and one in Los Angeles, California, which was previously deferred. The total gains of $63.6 million were included in Gain/(loss) on sale of real estate owned on the Consolidated Statements of Operations.

Unconsolidated Entities (UNITED

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	JOINT VENTURES AND PARTNERSHIPS UDR has entered into joint ventures and partnerships with unrelated third parties to acquire real estate assets that are either consolidated and included in Real Estate Owned on the Consolidated Balance Sheets or are accounted for under the equity method of accounting, and are included in Investment in and Advances to Unconsolidated Joint Ventures, Net on the Consolidated Balance Sheets. The Company consolidates the entities that we control as well as any variable interest entity where we are the primary beneficiary. In addition, the Company consolidates any joint venture or partnership in which we are the general partner or managing partner and the third party does not have the ability to substantively participate in the decision-making process nor the ability to remove us as general partner or managing partner without cause. UDR’s joint ventures and partnerships are funded with a combination of debt and equity. Our losses are limited to our investment and except as noted below, the Company does not guarantee any debt, capital payout or other obligations associated with our joint ventures and partnerships. The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships. The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of December 31, 2015 and 2014 (dollars in thousands) : Joint Venture Location of Properties Number of Properties Number of Apartment Homes Investment at UDR’s Ownership Interest December 31, December 31, December 31, December 31, December 31, December 31, Operating and development: UDR/MetLife I Various 4 land parcels — $ 15,894 $ 13,306 17.2 % 15.7 % UDR/MetLife II (a) Various 21 operating communities 4,642 425,230 431,277 50.0 % 50.0 % Other UDR/MetLife Development Joint Ventures 1 operating community; 4 development communities (b); Various 1 land parcels 1,437 171,659 134,939 50.6 % 50.6 % UDR/MetLife Vitruvian Park ® Addison, TX 3 operating communities; 6 land parcels 1,130 73,469 80,302 50.0 % 50.0 % UDR/KFH Washington, D.C. 3 operating communities 660 17,211 21,596 30.0 % 30.0 % Texas (c) Texas — — — (25,901 ) — % 20.0 % Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment 703,463 655,519 Investment at Income from investments for the years ending December 31, Location Rate Years To Maturity December 31, December 31, 2015 2014 2013 Participating loan investment: Steele Creek Denver, CO 6.5% 1.6 90,747 62,707 $ 5,453 $ 2,350 $ 156 Preferred equity investment: West Coast Development Joint Venture (d) Various 6.5% — 144,696 — $ 3,692 $ — $ — Total investment in and advances to unconsolidated joint ventures, net $ 938,906 $ 718,226 (a) In September 2015, the 717 Olympic community, which is held by the UDR/MetLife II joint venture, experienced extensive water damage due a ruptured water pipe. For the year ended December 31, 2015, the Company recorded losses of $2.5 million , its proportionate share of the total losses incurred. (b) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes. As of December 31, 2015 , no apartment homes had been completed in Other UDR/MetLife Development Joint Ventures. (c) In January 2015, the eight communities held by the Texas joint venture were sold, generating net proceeds to UDR of $44.2 million . The Company recorded promote and fee income of $10.0 million and a gain of $59.4 million (including $24.2 million of previously deferred gains) in connection with the sale. (d) In May 2015, the Company entered into a joint venture agreement with real estate private equity firm, The Wolff Company (“Wolff”), and agreed to pay $136.3 million for a 48 percent ownership interest in a portfolio of five communities that are currently under construction (the "West Coast Development Joint Venture"). The communities are located in three of the Company’s core, coastal markets: Metro Seattle, Los Angeles and Orange County, CA. UDR earns a 6.5 percent preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80 percent occupancy for ninety consecutive days, while Wolff is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage. The Company will serve as property manager and be paid a management fee during the lease-up phase and subsequent operation of each of the communities. Wolff is the general partner of the joint venture and the developer of the communities. The Company has a fixed price option to acquire Wolff’s remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total price will be $597.4 million . In the event the Company does not exercise its options to purchase at least two communities, Wolff will be entitled to earn a contingent disposition fee equal to 6.5 percent return on its implied equity in the communities not acquired. Wolff is providing certain guaranties and there are construction loans on all five communities. Once completed, the five communities will contain 1,533 homes. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting. The Company's recorded equity investment in the West Coast Development Joint Venture at December 31, 2015 of $144.7 million is inclusive of outside basis costs and our accrued but unpaid preferred return. During the year ended December 31, 2015 , the Company earned a preferred return of $5.2 million , offset by its share of the West Coast Development Joint Venture transaction expenses of $1.5 million . As of December 31, 2015 and 2014 , the Company had deferred fees and deferred profit of $6.8 million and $24.7 million , respectively, which will be recognized through earnings over the weighted average life of the related properties, upon the disposition of the properties to a third party, or upon completion of certain development obligations. The Company recognized $11.3 million , $11.3 million , and $11.2 million of management fees during the years ended December 31, 2015 , 2014 , and 2013 , respectively, for our management of the joint ventures and partnerships. The management fees are included in Joint venture management and other fees on the Consolidated Statements of Operations. The Company may, in the future, make additional capital contributions to certain of our joint ventures and partnerships should additional capital contributions be necessary to fund development, acquisitions or operations. We evaluate our investments in unconsolidated joint ventures and partnerships when events or changes in circumstances indicate that there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. The Company did not recognize any other-than-temporary decrease in the value of its other investments in unconsolidated joint ventures or partnerships during the years ended December 31, 2015 , 2014 , and 2013 . Combined summary financial information relating to all of the unconsolidated joint ventures and partnerships operations (not just our proportionate share), is presented below for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands): As of and For the Year Ended December 31, 2015 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 541 $ 170,062 $ 7,634 $ 22,139 $ 19,338 $ — $ 219,714 Property operating expenses (906 ) (63,516 ) (3,826 ) (11,519 ) (7,733 ) — (87,500 ) Real estate depreciation and amortization (818 ) (46,616 ) (6,897 ) (6,639 ) (14,522 ) — (75,492 ) Operating income/(loss) (1,183 ) 59,930 (3,089 ) 3,981 (2,917 ) — 56,722 Interest expense — (52,037 ) (2,566 ) (4,848 ) (5,539 ) — (64,990 ) Income/(loss) from discontinued operations (20 ) — — — — 184,138 184,118 Net income/(loss) $ (1,203 ) $ 7,893 $ (5,655 ) $ (867 ) $ (8,456 ) $ 184,138 $ 175,850 UDR recorded income (loss) from unconsolidated entities $ (513 ) $ 3,578 $ 6,088 $ (3,711 ) $ (2,537 ) $ 59,424 $ 62,329 Condensed Balance Sheets: Total real estate, net $ 92,915 $ 1,942,630 $ 604,611 $ 273,897 $ 221,704 $ — $ 3,135,757 Cash and cash equivalents 1,202 20,767 5,996 7,185 1,320 10 36,480 Other assets 174 24,914 1,921 2,317 565 — 29,891 Total assets 94,291 1,988,311 612,528 283,399 223,589 10 3,202,128 Amount due to/(from) UDR 2 — 5,929 908 427 — 7,266 Third party debt — 1,122,662 201,114 126,388 164,299 — 1,614,463 Accounts payable and accrued liabilities 395 24,244 62,267 7,137 1,480 — 95,523 Total liabilities 397 1,146,906 269,310 134,433 166,206 — 1,717,252 Total equity $ 93,894 $ 841,405 $ 343,218 $ 148,966 $ 57,383 $ 10 $ 1,484,876 UDR’s investment in and advances to unconsolidated joint ventures $ 15,894 $ 425,230 $ 407,102 $ 73,469 $ 17,211 $ — $ 938,906 As of and For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 727 $ 152,047 $ 1,579 $ 19,376 $ 19,724 $ — $ 193,453 Property operating expenses 618 52,150 1,122 10,711 7,498 — 72,099 Real estate depreciation and amortization 2,130 41,504 3,959 7,380 14,426 — 69,399 Operating income/(loss) (2,021 ) 58,393 (3,502 ) 1,285 (2,200 ) — 51,955 Interest expense — (48,493 ) (94 ) (4,131 ) (5,873 ) — (58,591 ) Income/(loss) from discontinued operations (31,802 ) — — — — (4,229 ) (36,031 ) Net income/(loss) $ (33,823 ) $ 9,900 $ (3,596 ) $ (2,846 ) $ (8,073 ) $ (4,229 ) $ (42,667 ) UDR recorded income/(loss) from unconsolidated entities $ (2,955 ) $ 2,814 $ 576 $ (4,068 ) $ (2,601 ) $ (772 ) $ (7,006 ) Condensed Balance Sheets: Total real estate, net $ 89,482 $ 1,986,237 $ 351,861 $ 278,600 $ 235,623 $ — $ 2,941,803 Assets held for sale 1,978 — — — — 214,218 216,196 Cash and cash equivalents 1,983 15,245 6,239 6,570 2,507 — 32,544 Other assets (a) (146 ) 12,938 1,101 3,248 708 — 17,849 Total assets (a) 93,297 2,014,420 359,201 288,418 238,838 214,218 3,208,392 Amount due to/(from) UDR 107 (444 ) 843 1,960 531 — 2,997 Third party debt (a) — 1,140,458 65,408 122,964 164,789 — 1,493,619 Liabilities held for sale 5,110 — — — — 224,596 229,706 Accounts payable and accrued liabilities (a) 749 17,573 17,851 6,766 1,396 — 44,335 Total liabilities (a) 5,966 1,157,587 84,102 131,690 166,716 224,596 1,770,657 Total equity $ 87,331 $ 856,833 $ 275,099 $ 156,728 $ 72,122 $ (10,378 ) $ 1,437,735 UDR’s investment in and advances to unconsolidated joint ventures $ 13,306 $ 431,277 $ 197,646 $ 80,302 $ 21,596 $ (25,901 ) $ 718,226 (a) The Company elected to early adopt FASB ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, and ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , during the fourth quarter of 2015. See Note 2, Significant Accounting Policies , for a complete description of the ASUs and their impact. Under the ASUs, deferred financing costs related to debt are treated as offsets to the debt instead of assets. As a result of adopting the ASUs, the following retrospective changes were made to the above table: For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Other assets - as previously reported $ (146 ) $ 19,589 $ 4,203 $ 3,933 $ 1,128 $ — $ 28,707 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Other assets - as presented above $ (146 ) $ 12,938 $ 1,101 $ 3,248 $ 708 $ — $ 17,849 Total assets - as previously reported $ 93,297 $ 2,021,071 $ 362,303 $ 289,103 $ 239,258 $ 214,218 $ 3,219,250 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total assets - as presented above $ 93,297 $ 2,014,420 $ 359,201 $ 288,418 $ 238,838 $ 214,218 $ 3,208,392 Third party debt - as previously reported $ — $ 1,147,109 $ 68,510 $ 123,649 $ 165,209 $ — $ 1,504,477 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Third party debt - as presented above $ — $ 1,140,458 $ 65,408 $ 122,964 $ 164,789 $ — $ 1,493,619 Accounts payable and accrued liabilities - as previously reported $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Deferred financing costs — — — — — — — Accounts payable and accrued liabilities - as presented above $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Total liabilities - as previously reported $ 5,966 $ 1,164,238 $ 87,204 $ 132,375 $ 167,136 $ 224,596 $ 1,781,515 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total liabilities - as presented above $ 5,966 $ 1,157,587 $ 84,102 $ 131,690 $ 166,716 $ 224,596 $ 1,770,657 For the Year Ended December 31, 2013 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 691 $ 109,926 $ 5,324 $ 7,680 $ 19,221 $ — $ 142,842 Property operating expenses 621 33,809 3,292 4,633 7,035 — 49,390 Real estate depreciation and amortization 115 30,122 3,564 3,830 14,199 — 51,830 Operating income/(loss) (45 ) 45,995 (1,532 ) (783 ) (2,013 ) — 41,622 Interest expense — (37,055 ) (913 ) (1,886 ) (5,872 ) — (45,726 ) Other income/(expense) — 1 — — — — 1 Income/(loss) from discontinued operations (22,388 ) — — — — (9,584 ) (31,972 ) Net income/(loss) $ (22,433 ) $ 8,941 $ (2,445 ) $ (2,669 ) $ (7,885 ) $ (9,584 ) $ (36,075 ) UDR recorded income/(loss) from unconsolidated entities $ (4,675 ) $ 4,471 $ 6,224 $ (2,851 ) $ (2,366 ) $ (1,218 ) $ (415 )
United Dominion Reality L.P.
Schedule of Equity Method Investments [Line Items]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	UNCONSOLIDATED ENTITIES UDR Lighthouse DownREIT L.P. Formation In October 2015, in connection with the acquisition of four properties from Home Properties, L.P., UDR, Inc., as the sole general partner and a limited partner, and the Operating Partnership, as limited partner, entered into the Agreement of Limited Partnership (the “Partnership Agreement”) of the DownREIT Partnership. As the sole general partner of the DownREIT Partnership, UDR, Inc. has full, complete and exclusive discretion to manage and control the business of the DownREIT Partnership and to make all decisions affecting the business and assets of the DownREIT Partnership, subject to certain protective limitations set forth in the Partnership Agreement. As of the closing of the transactions, UDR, Inc. and the Operating Partnership owned approximately 8.5% and 41.6% , respectively, of the units of limited partnership interest in the DownREIT Partnership (“DownREIT Units”), which they received in exchange for their contribution of the following properties to the DownREIT Partnership and cash of $25.5 million : Property Location Ridge at Blue Hills (a) Braintree, MA Residences at the Domain (a) Austin, TX Inwood West (b) Woburn, MA Thirty377 (b) Dallas, TX Legacy Village (b) Plano, TX Delancey at Shirlington (b) Arlington, VA Circle Towers (b) Fairfax, VA Barton Creek Landing (b) Austin, TX The Whitmore (b) Arlington, VA (a) Contributed by UDR, Inc. (b) Contributed by the Operating Partnership. The limited partners have no power to remove UDR, Inc. as general partner of the DownREIT Partnership. The DownREIT Partnership is structured to make distributions in respect of DownREIT Units that will be equivalent to the distributions made to holders of UDR, Inc.’s common stock. Subject to certain terms and conditions set forth in the Partnership Agreement, limited partners in the DownREIT Partnership (other than UDR, Inc. and its affiliates) have the right, commencing one year after the date of issuance, to tender their DownREIT Units for redemption for cash or, at UDR Inc.’s election, for shares of its common stock on a one-for-one basis (subject to the anti-dilution adjustments provided in the Partnership Agreement). The DownREIT Partnership is accounted for by the Operating Partnership under the equity method of accounting, and is included in Investment in unconsolidated entities on the Consolidated Balance Sheets. The communities listed above that were contributed to the DownREIT Partnership by the Operating Partnership were deconsolidated by the Operating Partnership upon contribution. See Note 4, Real Estate Owned , for the impact of the deconsolidation on the Consolidated Balance Sheets. The Operating Partnership recognizes earnings or losses from its investments in unconsolidated entities consisting of our proportionate share of the net earnings or losses of the partnership. The following table summarizes the Operating Partnership’s investment in the DownREIT Partnership as of December 31, 2015 (dollars in thousands) : Entity Location of Properties Number of Properties Number of Apartment Homes Investment at UDR’s Ownership Interest December 31, December 31, December 31, December 31, December 31, December 31, Operating and development: DownREIT Partnership Various 13 operating communities 6,261 $ 166,186 $ — 41.6 % — % Combined summary financial information relating to all of the DownREIT Partnership’s operations (not just our proportionate share), is presented below for the year ended December 31, 2015 ( dollars in thousands): As of and For the Year Ended December 31, 2015 DownREIT Partnership Condensed Consolidated Statement of Operations: Rental income $ 29,933 Property operating and maintenance (9,991 ) Real estate depreciation and amortization (28,934 ) Operating income/(loss) (8,992 ) Interest expense (3,632 ) Other income/(expense) (3,180 ) Net income/(loss) $ (15,804 ) OP recorded income (loss) from unconsolidated entities $ (4,659 ) Condensed Consolidated Balance Sheet: Total real estate, net $ 1,457,244 Cash and cash equivalents 89 Other assets 37,228 Note receivable from affiliate 126,500 Amount due from UDR 35,293 Total assets 1,656,354 Secured debt, net 524,052 Accounts payable, accrued expenses and other liabilities 25,487 Total liabilities 549,539 Total equity 1,106,815 Total liabilities and equity $ 1,656,354 OP’s investment in and advances to unconsolidated joint ventures $ 166,186 The Operating Partnership’s results of operations include loss from unconsolidated entities of $4.7 million related to the acquisition of interest in the DownREIT Partnership from the acquisition date to December 31, 2015. The unaudited pro forma information below summarizes the Operating Partnership’s combined results of operations for the years ended December 31, 2015, and 2014 as though the above acquisition was completed on January 1, 2014. The information for the year ended December 31, 2015 includes pro forma results for the portion of the period prior to the acquisition date and actual results from the date of acquisition through the end of the period. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the Operating Partnership’s results of operations for future periods ( in thousands ): Year Ended December 31, 2015 2014 Pro forma net income/(loss) from unconsolidated entities $ (12,006 ) $ (26,511 ) Pro forma net income/(loss) attributable to OP unitholders $ 205,954 $ 69,716

Debt (UNITED DOMINION REALTY, L

Debt (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
DEBT	SECURED AND UNSECURED DEBT, NET The following is a summary of our secured and unsecured debt at December 31, 2015 and 2014 ( dollars in thousands): Principal Outstanding For the Year Ended December 31, 2015 Weighted Average Interest Rate Weighted Average Years to Maturity Number of Communities Encumbered December 31, 2015 2014 Secured Debt: Fixed Rate Debt Mortgage notes payable (a) $ 442,617 $ 401,210 4.57 % 4.5 8 Fannie Mae credit facilities (b) 514,462 568,086 5.23 % 3.1 18 Deferred financing costs (4,278 ) (5,583 ) Total fixed rate secured debt, net 952,801 963,713 4.93 % 3.7 26 Variable Rate Debt Mortgage notes payable 31,337 31,337 2.19 % 1.1 1 Tax-exempt secured notes payable (c) 94,700 94,700 0.75 % 7.2 2 Fannie Mae credit facilities (b) 299,378 266,196 1.71 % 4.1 8 Deferred financing costs (1,271 ) (1,625 ) Total variable rate secured debt, net 424,144 390,608 1.53 % 4.5 11 Total Secured Debt, net 1,376,945 1,354,321 3.88 % 4.0 37 Unsecured Debt: Variable Rate Debt Borrowings outstanding under unsecured credit facilities due January 2020 and December 2017, respectively (d) (h) 150,000 152,500 1.19 % 4.1 Borrowings outstanding under unsecured working capital credit facility due January 2019 (e) — — — % 3.0 1.21% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 35,000 35,000 1.21 % 5.1 Fixed Rate Debt 5.25% Medium-Term Notes due January 2015 (net of discounts of $0 and $6, respectively) (f) — 325,169 — % 0.0 5.25% Medium-Term Notes due January 2016 (i) 83,260 83,260 5.25 % 0.0 6.21% Medium-Term Note due July 2016 (j) 12,091 — 6.21 % 0.5 4.25% Medium-Term Notes due June 2018 (net of discounts of $1,037 and $1,465, respectively) (h) 298,963 298,535 4.25 % 2.4 3.70% Medium-Term Notes due October 2020 (net of discounts of $38 and $46, respectively) (h) 299,962 299,954 3.70 % 4.8 1.44% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 315,000 315,000 1.44 % 5.1 4.63% Medium-Term Notes due January 2022 (net of discounts of $2,164 and $2,523, respectively) (h) 397,836 397,477 4.63 % 6.0 3.75% Medium-Term Notes due July 2024 (net of discounts of $886 and $990, respectively) (h) 299,114 299,010 3.75 % 8.5 8.50% Debentures due September 2024 15,644 15,644 8.50 % 8.7 4.00% Medium-Term Notes due October 2025 (net of discount of $671 and $0, respectively) (g) (h) 299,329 — 4.00 % 9.8 Other 24 27 N/A N/A Deferred financing costs (12,373 ) (10,598 ) N/A N/A Total Unsecured Debt, net 2,193,850 2,210,978 3.64 % 5.7 Total Debt, net $ 3,570,795 $ 3,565,299 3.74 % 5.0 For purposes of classification of the above table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Company having effectively established a fixed interest rate for the underlying debt instrument. Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. As of December 31, 2015 , secured debt encumbered $2.4 billion or 25.9% of UDR’s total real estate owned based upon gross book value ( $6.8 billion or 74.1% of UDR’s real estate owned based on gross book value is unencumbered). (a) At December 31, 2015 , fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from June 2016 through November 2025 and carry interest rates ranging from 3.43% to 6.16% . The Company will from time to time acquire properties subject to fixed rate debt instruments. In those situations, management will record the secured debt at its estimated fair value and amortize any difference between the fair value and par to interest expense over the life of the underlying debt instrument. In October 2015, the Company assumed debt with a fair market value of $96.5 million as part of our acquisition of the six communities from Home OP, as described in Note 4, Real Estate Owned . During the years ended December 31, 2015 , 2014 , and 2013 , the Company had $5.3 million , $5.1 million , and $5.1 million , respectively, of amortization expense on the fair market adjustment of debt assumed in acquisition of properties, which was included in Interest expense on the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $10.0 million and $6.7 million at December 31, 2015 and 2014 , respectively. (b) UDR has three secured credit facilities with Fannie Mae with an aggregate commitment of $813.8 million at December 31, 2015 . The Fannie Mae credit facilities are for terms of seven to ten years (maturing at various dates from May 2017 through July 2023 ) and bear interest at floating and fixed rates. At December 31, 2015 , $514.5 million of the outstanding balance was fixed at a weighted average interest rate of 5.23% and the remaining balance of $299.4 million on these facilities had a weighted average variable interest rate of 1.71% . Further information related to these credit facilities is as follows (dollars in thousands) : December 31, December 31, 2014 Borrowings outstanding $ 813,840 $ 834,282 Weighted average borrowings during the period ended 822,521 835,873 Maximum daily borrowings during the period ended 834,003 837,564 Weighted average interest rate during the period ended 4.0 % 4.1 % Weighted average interest rate at the end of the period 3.9 % 4.0 % (c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature on August 2019 and March 2032 . Interest on these notes is payable in monthly installments. The variable mortgage notes have interest rates of 0.75% and 0.76% , respectively, as of December 31, 2015 . (d) On October 20, 2015, the Company, as borrower, entered into a credit agreement (the “Credit Agreement”), which provides for a $1.1 billion senior unsecured revolving credit facility (the “Revolving Credit Facility”) and a $350.0 million senior unsecured term loan facility (the “Term Loan Facility”). The Credit Agreement includes an accordion feature that allows the total commitments under the Revolving Credit Facility and the total borrowings under the Term Loan Facility to be increased to an aggregate maximum amount of up to $2.0 billion , subject to certain conditions, including obtaining commitments from any one or more lenders. The Revolving Credit Facility has a scheduled maturity date of January 31, 2020, with two six -month extension options, subject to certain conditions. The Term Loan Facility has a scheduled maturity date of January 29, 2021. The Credit Agreement replaced (i) the Company’s previous $900 million revolving credit facility originally scheduled to mature in December 2017 and (ii) the Company’s $250 million term loan and the Company’s $100 million term loan, both originally due June 2018. Based on the Company’s current credit rating, the Revolving Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points and a facility fee of 15 basis points, and the Term Loan Facility has an interest rate equal to LIBOR plus a margin of 95 basis points. Depending on the Company’s credit rating, the margin under the Revolving Credit Facility ranges from 85 to 155 basis points, the facility fee ranges from 12.5 to 30 basis points, and the margin under the Term Loan Facility ranges from 90 to 175 basis points. The Credit Agreement contains customary representations and warranties and financial and other affirmative and negative covenants. The Credit Agreement also includes customary events of default, in certain cases subject to customary periods to cure. The occurrence of an event of default, following the applicable cure period, would permit the lenders to, among other things, declare the unpaid principal, accrued and unpaid interest and all other amounts payable under the Credit Agreement to be immediately due and payable. The Company’s obligations under the Credit Agreement are guaranteed by the Operating Partnership, pursuant to a guaranty dated as of October 20, 2015. The following is a summary of short-term bank borrowings under UDR’s revolving credit facility at December 31, 2015 and 2014 (dollars in thousands): December 31, 2015 December 31, 2014 Total revolving credit facility $ 1,100,000 $ 900,000 Borrowings outstanding at end of period (1) 150,000 152,500 Weighted average daily borrowings during the period ended 353,647 291,761 Maximum daily borrowings during the period ended 541,500 625,000 Weighted average interest rate during the period ended 1.1 % 1.2 % Interest rate at end of the period 1.2 % 1.1 % (1) Excludes $2.3 million and $1.9 million of letters of credit at December 31, 2015 and 2014 , respectively. (e) In December 2015, the Company entered into a working capital credit facility, which provides for a $30 million unsecured revolving credit facility (the “Working Capital Credit Facility”) with a scheduled maturity date of January 1, 2019. Based on the Company’s current credit rating, the Working Capital Credit Facility has an interest rate equal to LIBOR plus a margin of 90 basis points. Depending on the Company’s credit rating, the margin ranges from 85 to 155 basis points. (f) Paid off at maturity with borrowings under the Company’s $900 million unsecured revolving credit facility. (g) On September 22, 2015, the Company issued $300 million of 4.00% senior unsecured medium-term notes due October 1, 2025. Interest is payable semi-annually beginning on April 1, 2016. The notes were priced at 99.770% of the principal amount at issuance and had a discount of $0.7 million at December 31, 2015 . The Company used the net proceeds to pay down a portion of the borrowings outstanding on its prior $900 million unsecured credit facility and for general corporate purposes. The Company previously entered into forward starting interest rate swaps to hedge against interest rate risk on $200 million of this debt issuance. The all-in weighted average interest rate, inclusive of the impact of these interest rate swaps, was 4.55% . (h) The Operating Partnership is a guarantor at December 31, 2015 and 2014 . (i) In January 2016, we paid off $83.3 million of 5.25% medium-term notes due January 2016 with borrowings under the Company’s $1.1 billion unsecured revolving credit facility. (j) The 6.21% Medium-Term Note due July 2016 was acquired in February 2015 as part of the acquisition of an office building in Highlands Ranch, Colorado, as described in See Note 4, Real Estate Owned. The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next ten years subsequent to December 31, 2015 are as follows (dollars in thousands): Year Total Fixed Secured Debt Total Variable Secured Debt Total Secured Debt Total Unsecured Debt Total Debt 2016 $ 149,058 $ — $ 149,058 $ 95,053 $ 244,111 2017 179,189 96,337 275,526 — 275,526 2018 73,096 137,969 211,065 300,000 511,065 2019 247,796 67,700 315,496 — 315,496 2020 170,664 — 170,664 450,000 620,664 2021 — — — 350,000 350,000 2022 — — — 400,000 400,000 2023 — 96,409 96,409 — 96,409 2024 — — — 315,644 315,644 2025 127,600 — 127,600 300,000 427,600 Thereafter — 27,000 27,000 — 27,000 Subtotal 947,403 425,415 1,372,818 2,210,697 3,583,515 Non-cash (a) 5,398 (1,271 ) 4,127 (16,847 ) (12,720 ) Total $ 952,801 $ 424,144 $ 1,376,945 $ 2,193,850 $ 3,570,795 (a) Includes the unamortized balance of fair market value adjustments, premiums/discounts, deferred hedge gains, and deferred financing costs. For the years ended December 31, 2015 and 2014, the Company amortized $7.0 million and $7.2 million , respectively, of deferred financing costs into Interest expense . We were in compliance with the covenants of our debt instruments at December 31, 2015 .
United Dominion Reality L.P.
Entity Information [Line Items]
DEBT	DEBT, NET Our secured debt instruments generally feature either monthly interest and principal or monthly interest-only payments with balloon payments due at maturity. For purposes of classification in the following table, variable rate debt with a derivative financial instrument designated as a cash flow hedge is deemed as fixed rate debt due to the Operating Partnership having effectively established the fixed interest rate for the underlying debt instrument. Secured debt consists of the following as of December 31, 2015 and 2014 ( dollars in thousands ): Principal Outstanding For the Year Ended December 31, 2015 December 31, Weighted Average Interest Rate Weighted Average Years to Maturity Number of Communities Encumbered 2015 2014 Fixed Rate Debt Mortgage notes payable $ 30,132 $ 378,371 3.43 % 0.6 1 Fannie Mae credit facilities 250,828 333,828 5.08 % 3.7 8 Deferred financing costs (1,627 ) (3,665 ) Total fixed rate secured debt, net 279,333 708,534 4.90 % 3.3 9 Variable Rate Debt Tax-exempt secured note payable 27,000 27,000 0.76 % 16.2 1 Fannie Mae credit facilities 170,203 192,760 1.90 % 4.7 6 Deferred financing costs (572 ) (810 ) Total variable rate secured debt, net 196,631 218,950 1.74 % 6.3 7 Total secured debt, net $ 475,964 $ 927,484 3.76 % 4.5 16 As of December 31, 2015 , an aggregate commitment of $421.0 million of the General Partner's secured credit facilities with Fannie Mae was allocated to the Operating Partnership based on the ownership of the assets securing the debt. The entire commitment was outstanding at December 31, 2015 . The Fannie Mae credit facilities mature at various dates from May 2017 through July 2023 and bear interest at floating and fixed rates. At December 31, 2015 , $250.8 million of the outstanding balance was fixed at a weighted average interest rate of 5.08% and the remaining balance of $170.2 million on these facilities had a weighted average variable interest rate of 1.90% . The following is information related to the credit facilities allocated to the Operating Partnership ( dollars in thousands ): December 31, December 31, 2014 Borrowings outstanding $ 421,031 $ 526,588 Weighted average borrowings during the period ended 425,522 527,592 Maximum daily borrowings during the period ended 431,462 528,659 Weighted average interest rate during the period ended 3.8 % 4.1 % Interest rate at the end of the period 3.8 % 4.0 % The Operating Partnership may from time to time acquire properties subject to fixed rate debt instruments. In those situations, management will record the secured debt at its estimated fair value and amortize any difference between the fair value and par to interest expense over the life of the underlying debt instrument. The unamortized fair value adjustment of the fixed rate debt instruments on the Operating Partnership’s properties was a net premium of $0.0 and $6.2 million at December 31, 2015 and 2014 , respectively. Fixed Rate Debt Mortgage notes payable. Fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature in August 2016 and carry an interest rate of 3.43% . Secured credit facilities. At December 31, 2015 , the General Partner had borrowings against its fixed rate facilities of $514.5 million , of which $250.8 million was allocated to the Operating Partnership based on the ownership of the assets securing the debt. As of December 31, 2015 , the fixed rate Fannie Mae credit facilities allocated to the Operating Partnership had a weighted average fixed interest rate of 5.08% . Variable Rate Debt Tax-exempt secured note payable. The variable rate mortgage note payable that secures tax-exempt housing bond issues matures in March 2032 . Interest on this note is payable in monthly installments. The mortgage note payable has an interest rate of 0.76% as of December 31, 2015 . Secured credit facilities. At December 31, 2015 , the General Partner had borrowings against its variable rate facilities of $299.4 million , of which $170.2 million was allocated to the Operating Partnership based on the ownership of the assets securing the debt. As of December 31, 2015 , the variable rate borrowings under the Fannie Mae credit facilities allocated to the Operating Partnership had a weighted average floating interest rate of 1.90% . The aggregate maturities of the Operating Partnership’s secured debt due during each of the next ten calendar years subsequent to December 31, 2015 are as follows (dollars in thousands): Fixed Variable Mortgage Notes Payable Secured Credit Facilities Tax-Exempt Secured Notes Payable Secured Credit Facilities Total 2016 $ 30,132 $ 385 $ — $ — $ 30,517 2017 — 15,640 — 6,566 22,206 2018 — 48,872 — 96,327 145,199 2019 — 123,095 — — 123,095 2020 — 62,836 — — 62,836 2021 — — — — — 2022 — — — — — 2023 — — — 67,310 67,310 2024 — — — — — 2025 — — — — — Thereafter — — 27,000 — 27,000 Subtotal 30,132 250,828 27,000 170,203 478,163 Non-cash (a) (97 ) (1,530 ) (93 ) (479 ) (2,199 ) Total $ 30,035 $ 249,298 $ 26,907 $ 169,724 $ 475,964 (a) Includes the unamortized balance of fair market value adjustments, premiums/discounts, deferred hedge gains, and deferred financing costs. For the years ended December 31, 2015 and 2014, the Operating Partnership amortized $1.3 million and $1.4 million , respectively, of deferred financing costs into Interest expense . Guarantor on Unsecured Debt The Operating Partnership is a guarantor on the General Partner’s unsecured revolving credit facility, with an aggregate borrowing capacity of $1.1 billion , $300 million of medium-term notes due June 2018 , $300 million of medium-term notes due October 2020 , a $350 million term loan facility due January 2021 , $400 million of medium-term notes due January 2022 , $300 million of medium-term notes due July 2024 , and $300 million of medium-term notes due October 2025 . As of December 31, 2015 and 2014 , there were outstanding borrowings of $150.0 million and $152.5 million , respectively, under the unsecured credit facility.

Related Party Transactions (UNI

Related Party Transactions (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
United Dominion Reality L.P.
Entity Information [Line Items]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS Advances (To)/From the General Partner The Operating Partnership participates in the General Partner’s central cash management program, wherein all the Operating Partnership’s cash receipts are remitted to the General Partner and all cash disbursements are funded by the General Partner. In addition, other miscellaneous costs such as administrative expenses are incurred by the General Partner on behalf of the Operating Partnership. As a result of these various transactions between the Operating Partnership and the General Partner, the Operating Partnership had net advances (to)/from the General Partner of $(11.3) million and $13.6 million at December 31, 2015 and 2014 , respectively, which is reflected as an increase/(reduction) of capital on the Consolidated Balance Sheets. Allocation of General and Administrative Expenses The General Partner provides various general and administrative and other overhead services for the Operating Partnership including legal assistance, acquisitions analysis, marketing and advertising, and allocates these expenses to the Operating Partnership first on the basis of direct usage when identifiable, with the remainder allocated based on its pro-rata portion of UDR’s total apartment homes. During the years ended December 31, 2015 , 2014 , and 2013 , the general and administrative expenses allocated to the Operating Partnership by UDR were $21.0 million , $27.4 million , and $23.5 million , respectively, and are included in General and administrative on the Consolidated Statements of Operations. In the opinion of management, this method of allocation reflects the level of services received by the Operating Partnership from the General Partner. During the years ended December 31, 2015 , 2014 , and 2013 , the Operating Partnership incurred $17.7 million , $12.7 million , and $12.3 million , respectively, of related party management fees related to a management agreement entered into in 2011 with wholly-owned subsidiaries of our TRS. (See further discussion in paragraph below.) These related party management fees are initially recorded within the line item General and administrative on the Consolidated Statements of Operations, and a portion related to management fees charged by the TRS of the General Partner is reclassified to Property management on the Consolidated Statements of Operations. (See further discussion below.) Management Fee In 2011, the Operating Partnership entered into a management agreement with wholly-owned subsidiaries of our TRS. Under the management agreement, the Operating Partnership is charged a management fee equal to 2.75% of gross rental revenues, which is reported in Property management on the Consolidated Statements of Operations. Guaranties by the General Partner The Operating Partnership provided a “bottom dollar” guaranty to certain limited partners as part of their original contribution to the Operating Partnership. The guaranty protects the tax basis of the underlying contribution and is reflected on the OP unitholder’s Schedule K-1 tax form. The guaranty was made in the form of a note payable issued by the Operating Partnership to the General Partner at an annual interest rate of 5.18% for the years ended December 31, 2015 and 2014 , respectively. On December 31, 2013, the note was renewed at an annual interest rate of 5.18% . Interest payments are made monthly and the renewed note is due December 31, 2023. At December 31, 2015 and 2014 , the note payable due to the General Partner was $83.2 million . In 2011, the Operating Partnership also provided a “bottom dollar” guaranty in conjunction with 1,802,239 OP Units issued in partial consideration to the seller for the acquisition of an operating community. The guaranty was made in the form of a note payable issued by the Operating Partnership to the General Partner at an annual interest rate of 5.34% . Interest payments are due monthly and the note matures on August 31, 2021. At December 31, 2015 and 2014 , the note payable due to the General Partner was $5.5 million . In December 2015, the Operating Partnership provided a “bottom dollar” guaranty on three promissory notes with an aggregate value of $184.6 million . The guaranty was made in the form of a note payable issued by the Operating Partnership to the General Partner at an annual interest rate of 4.12% . Interest payments are due monthly and the notes mature on April 1, 2026.

Fair Value of Derivatives and39

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS	FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below: • Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. • Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data. • Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of December 31, 2015 and 2014 are summarized as follows (dollars in thousands) : Fair Value at December 31, 2015, Using Total Carrying Amount in Statement of Financial Position at December 31, 2015 Fair Value Estimate at December 31, 2015 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 16,694 $ 16,938 $ — $ — $ 16,938 Derivatives - Interest rate contracts (b) 13 13 — 13 — Total assets $ 16,707 $ 16,951 $ — $ 13 $ 16,938 Derivatives - Interest rate contracts (b) $ 2,112 $ 2,112 $ — $ 2,112 $ — Secured debt instruments - fixed rate: (c) Mortgage notes payable 442,617 448,019 — — 448,019 Fannie Mae credit facilities 514,462 539,050 — — 539,050 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 299,378 299,378 — — 299,378 Unsecured debt instruments (c): Commercial banks 150,000 150,000 — — 150,000 Senior unsecured notes 2,056,223 2,108,687 — — 2,108,687 Total liabilities $ 3,590,829 $ 3,673,283 $ — $ 2,112 $ 3,671,171 Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d) $ 946,436 $ 946,436 $ — $ 946,436 $ — Fair Value at December 31, 2014, Using Total Carrying Amount in Statement of Financial Position at December 31, 2014 Fair Value Estimate at December 31, 2014 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 14,369 $ 14,808 $ — $ — $ 14,808 Derivatives- Interest rate contracts (b) 88 88 — 88 — Total assets $ 14,457 $ 14,896 $ — $ 88 $ 14,808 Derivatives- Interest rate contracts (b) $ 10,368 $ 10,368 $ — $ 10,368 $ — Secured debt instruments- fixed rate: (c) Mortgage notes payable 401,210 415,663 — — 415,663 Fannie Mae credit facilities 568,086 606,623 — — 606,623 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 266,196 266,196 — — 266,196 Unsecured debt instruments: (c) Commercial banks 152,500 152,500 — — 152,500 Senior unsecured notes 2,069,076 2,144,125 — — 2,144,125 Total liabilities $ 3,593,473 $ 3,721,512 $ — $ 10,368 $ 3,711,144 Redeemable noncontrolling interests in the Operating Partnership (d) $ 282,480 $ 282,480 $ — $ 282,480 $ — (a) See Note 2 , Significant Accounting Policies. (b) See Note 13, Derivatives and Hedging Activity. (c) See Note 6, Secured Debt and Unsecured Debt, Net. (d) See Note 11, Noncontrolling Interests. There were no transfers into or out of each of the levels of the fair value hierarchy. Financial Instruments Carried at Fair Value The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. The Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Company has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2015 and 2014 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Company made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership have a redemption feature and are marked to their redemption value. The redemption value is based on the fair value of the Company’s common stock at the redemption date, and therefore, is calculated based on the fair value of the Company’s common stock at the balance sheet date. Since the valuation is based on observable inputs such as quoted prices for similar instruments in active markets, redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership are classified as Level 2. Financial Instruments Not Carried at Fair Value At December 31, 2015 , the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Company using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts. We estimate the fair value of our notes receivable and debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality, where applicable (Level 3). We record impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Our cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. Our estimates of fair value represent our best estimate based upon Level 3 inputs such as industry trends and reference to market rates and transactions. We consider various factors to determine if a decrease in the value of our investment in and advances to unconsolidated joint ventures, net is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, and the relationships with the other joint venture partners and its lenders. Based on the significance of the unobservable inputs, we classify these fair value measurements within Level 3 of the valuation hierarchy. The Company did not incur any other-than-temporary decrease in the value of its investments in unconsolidated joint ventures during the years ended December 31, 2015 , 2014 , and 2013 . After determining an other-than-temporary decrease in the value of an equity method investment has occurred, we estimate the fair value of our investment by estimating the proceeds we would receive upon a hypothetical liquidation of the investment at the date of measurement. Inputs reflect management’s best estimate of what market participants would use in pricing the investment giving consideration to the terms of the joint venture agreement and the estimated discounted future cash flows to be generated from the underlying joint venture assets. The inputs and assumptions utilized to estimate the future cash flows of the underlying assets are based upon the Company’s evaluation of the economy, market trends, operating results, and other factors, including judgments regarding costs to complete any construction activities, lease up and occupancy rates, rental rates, inflation rates, capitalization rates utilized to estimate the projected cash flows at the disposition, and discount rates.
United Dominion Reality L.P.
Entity Information [Line Items]
FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS	FAIR VALUE OF DERIVATIVES AND FINANCIAL INSTRUMENTS Fair value is based on the price that would be received to sell an asset or the exit price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level valuation hierarchy prioritizes observable and unobservable inputs used to measure fair value. The fair value hierarchy consists of three broad levels, which are described below: • Level 1 — Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access. • Level 2 — Observable inputs other than prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated with observable market data. • Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs. The estimated fair values of the Operating Partnership’s financial instruments either recorded or disclosed on a recurring basis as of December 31, 2015 and 2014 are summarized as follows (dollars in thousands) : Fair Value at December 31, 2015, Using Total Carrying Amount in Statement of Financial Position at December 31, 2015 Fair Value Estimate at December 31, 2015 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Derivatives- Interest rate contracts (a) $ 8 $ 8 $ — $ 8 $ — Total assets $ 8 $ 8 $ — $ 8 $ — Secured debt instruments - fixed rate: (b) Mortgage notes payable 30,132 30,308 — — 30,308 Fannie Mae credit facilities 250,828 263,070 — — 263,070 Secured debt instruments - variable rate: (b) Tax-exempt secured notes payable 27,000 27,000 — — 27,000 Fannie Mae credit facilities 170,203 170,203 — — 170,203 Total liabilities $ 478,163 $ 490,581 $ — $ — $ 490,581 Fair Value at December 31, 2014, Using Total Carrying Amount in Statement of Financial Position at December 31, 2014 Fair Value Estimate at December 31, 2014 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Derivatives - Interest rate contracts (b) $ 39 $ 39 $ — $ 39 $ — Total assets $ 39 $ 39 $ — $ 39 $ — Derivatives- Interest rate contracts (a) $ 918 $ 918 $ — $ 918 $ — Secured debt instruments - fixed rate: (b) Mortgage notes payable 378,371 391,835 — — 391,835 Fannie Mae credit facilities 333,828 355,470 — — 355,470 Secured debt instruments - variable rate: (b) Tax-exempt secured notes payable 27,000 27,000 — — 27,000 Fannie Mae credit facilities 192,760 192,760 — — 192,760 Total liabilities $ 932,877 $ 967,983 $ — $ 918 $ 967,065 (a) See Note 9, Derivatives and Hedging Activity. (b) See Note 6, Secured Debt, Net. There were no transfers into or out of each of the levels of the fair value hierarchy. Financial Instruments Carried at Fair Value The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. The fair values of interest rate options are determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates rise above the strike rate of the caps. The variable interest rates used in the calculation of projected receipts on the cap are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. The Operating Partnership incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Operating Partnership has considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although the Operating Partnership has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2015 and December 31, 2014 , the Operating Partnership has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Operating Partnership has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. In conjunction with the FASB’s fair value measurement guidance, the Operating Partnership made an accounting policy election to measure the credit risk of its derivative financial instruments that are subject to master netting agreements on a net basis by counterparty portfolio. Financial Instruments Not Carried at Fair Value At December 31, 2015 , the fair values of cash and cash equivalents, restricted cash, accounts receivable, prepaids, real estate taxes payable, accrued interest payable, security deposits and prepaid rent, distributions payable and accounts payable approximated their carrying values because of the short term nature of these instruments. The estimated fair values of other financial instruments were determined by the Operating Partnership using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair values. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Operating Partnership would realize on the disposition of the financial instruments. The use of different market assumptions or estimation methodologies may have a material effect on the estimated fair value amounts. The General Partner estimates the fair value of our debt instruments by discounting the remaining cash flows of the debt instrument at a discount rate equal to the replacement market credit spread plus the corresponding treasury yields. Factors considered in determining a replacement market credit spread include general market conditions, borrower specific credit spreads, time remaining to maturity, loan-to-value ratios and collateral quality (Level 3). The Operating Partnership records impairment losses on long-lived assets used in operations when events and circumstances indicate that the assets might be impaired and the undiscounted cash flows estimated to be generated by the future operation and disposition of those assets are less than the net book value of those assets. Cash flow estimates are based upon historical results adjusted to reflect management’s best estimate of future market and operating conditions and our estimated holding periods. The net book value of impaired assets is reduced to fair value. The General Partner’s estimates of fair value represent management’s estimates based upon Level 3 inputs such as industry trends and reference to market rates and transactions.

Derivatives and Hedging Activ40

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
DERIVATIVES AND HEDGING ACTIVITY	DERIVATIVES AND HEDGING ACTIVITY Risk Management Objective of Using Derivatives The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its debt funding and through the use of derivative financial instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s investments and borrowings. Cash Flow Hedges of Interest Rate Risk The Company’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up front premium. The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the years ended December 31, 2015 , 2014 , and 2013 , such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt and forecasted issuances of fixed-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the year ended December 31, 2015 , the Company recognized a loss of less than $0.1 million reclassified from Accumulated OCI to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the years ended December 31, 2014 and 2013 , the Company recorded a gain of less than $0.1 million of ineffectiveness in earnings attributable to a timing difference between the derivative and the hedged item. Amounts reported in Accumulated other comprehensive income/(loss), net in the Consolidated Balance Sheets relate to deferred gains/(losses) on designated derivatives that will be reclassified to interest expense as interest payments are made on the Company’s hedged debt. Through December 31, 2016 , the Company estimates that an additional $3.0 million will be reclassified as an increase to interest expense. As of December 31, 2015 , the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk ( dollars in thousands ): Product Number of Instruments Notional Interest rate swaps 5 $ 315,000 Interest rate caps 2 $ 203,166 Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the Company has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the years ended December 31, 2015 and 2014 , and a gain of $0.3 million for the year ended December 31, 2013 . As of December 31, 2015 , the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 3 $ 133,107 Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 ( dollars in thousands ): Asset Derivatives (included in Other assets ) Liability Derivatives (included in Other liabilities ) Fair Value at: Fair Value at: December 31, December 31, December 31, December 31, Derivatives designated as hedging instruments: Interest rate products $ 9 $ 86 $ 2,112 $ 10,368 Derivatives not designated as hedging instruments: Interest rate products $ 4 $ 2 $ — $ — Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Derivatives in Cash Flow Hedging Relationships Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing) Year ended December 31, Year ended December 31, Year ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 Interest rate products $ (6,393 ) $ (8,695 ) $ (469 ) $ (2,251 ) $ (4,834 ) $ (6,851 ) $ (11 ) $ 3 $ — Gain/(Loss) Recognized in Interest income and other income/(expense), net Year ended December 31, Derivatives Not Designated as Hedging Instruments 2015 2014 2013 Interest rate products $ (23 ) $ (4 ) 271 Credit-risk-related Contingent Features The Company has agreements with some of its derivative counterparties that contain a provision where (1) if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations; or (2) the Company could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the Company’s default on the indebtedness. Certain of the Company’s agreements with its derivative counterparties contain provisions where, if there is a change in the Company’s financial condition that materially changes the Company’s creditworthiness in an adverse manner, the Company may be required to fully collateralize its obligations under the derivative instrument. At December 31, 2015 and 2014 , no cash collateral was posted or required to be posted by the Company or by a counterparty. The Company also has an agreement with a derivative counterparty that incorporates the loan and financial covenant provisions of the Company’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with these covenant provisions would result in the Company being in default on any derivative instrument obligations covered by the agreement. The Company has certain agreements with some of its derivative counterparties that contain a provision where, in the event of default by the Company or the counterparty, the right of setoff may be exercised. Any amount payable to one party by the other party may be reduced by its setoff against any amounts payable by the other party. Events that give rise to default by either party may include, but are not limited to, the failure to pay or deliver payment under the derivative contract, the failure to comply with or perform under the derivative agreement, bankruptcy, a merger without assumption of the derivative agreement, or in a merger, a surviving entity's creditworthiness is materially weaker than the original party to the derivative agreement. As of December 31, 2015 , the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $2.2 million . If the Company had breached any of these provisions at December 31, 2015 , it would have been required to settle its obligations under the agreements at their termination value of $2.2 million . Tabular Disclosure of Offsetting Derivatives The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 ( dollars in thousands ): Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Received December 31, 2015 $ 13 $ — $ 13 $ — $ — $ 13 December 31, 2014 $ 88 $ — $ 88 $ (27 ) $ — $ 61 (a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote. Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Posted December 31, 2015 $ 2,112 $ — $ 2,112 $ — $ — $ 2,112 December 31, 2014 $ 10,368 $ — $ 10,368 $ (27 ) $ — $ 10,341 (a) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.
United Dominion Reality L.P.
Entity Information [Line Items]
DERIVATIVES AND HEDGING ACTIVITY	DERIVATIVES AND HEDGING ACTIVITY Risk Management Objective of Using Derivatives The Operating Partnership is exposed to certain risks arising from both its business operations and economic conditions. The General Partner principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The General Partner manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its debt funding and through the use of derivative financial instruments. Specifically, the General Partner enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The General Partner’s and the Operating Partnership’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the General Partner’s known or expected cash payments principally related to the General Partner’s borrowings. Cash Flow Hedges of Interest Rate Risk The General Partner’s objectives in using interest rate derivatives are to add stability to interest expense and to manage its exposure to interest rate movements. To accomplish this objective, the General Partner primarily uses interest rate swaps and caps as part of its interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the General Partner making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate caps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty if interest rates rise above the strike rate on the contract in exchange for an up front premium. A portion of the General Partner’s interest rate derivatives have been allocated to the Operating Partnership based on the General Partner’s underlying debt instruments allocated to the Operating Partnership. (See Note 6, Secured Debt, Net. ) The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in Accumulated other comprehensive loss in the Consolidated Balance Sheets, and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the years ended December 31, 2015 , 2014 , and 2013 , such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt and forecasted issuances of fixed-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the year ended December 31, 2015 , the Operating Partnership recognized a loss of less than $0.1 million reclassified from Accumulated OCI to Interest expense due to the de-designation of a cash flow hedge and recorded no other ineffectiveness to earnings. During the years ended December 31, 2014 , and 2013 , the Operating Partnership recorded less than $0.1 million of ineffectiveness in earnings attributable to reset date and index mismatches between the derivative and the hedged item. Amounts reported in Accumulated other comprehensive loss related to deferred gains/(losses) on designated derivatives will be reclassified to interest expense as interest payments are made on the General Partner’s hedged debt that is allocated to the Operating Partnership. During the next twelve months through December 31, 2016, we estimate that less than $0.1 million will be reclassified as an increase to interest expense. As of December 31, 2015 , the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 1 $ 96,327 Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the General Partner has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in losses of less than $0.1 million for the years ended December 31, 2015 , 2014 , and 2013 . As of December 31, 2015 , we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 3 $ 98,932 Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets The table below presents the fair value of the Operating Partnership’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 ( dollars in thousands ): Asset Derivatives (included in Other assets ) Liability Derivatives (Included in Other liabilities ) Fair Value at: Fair Value at: December 31, December 31, December 31, December 31, Derivatives designated as hedging instruments: Interest rate products $ 4 $ 37 $ — $ 918 Derivatives not designated as hedging instruments: Interest rate products $ 4 $ 2 $ — $ — Tabular Disclosure of the Effect of Derivative Instruments on the Consolidated Statements of Operations The tables below present the effect of the derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Derivatives in Cash Flow Hedging Relationships Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) Gain/(Loss) Recognized in Interest expense (ineffective Portion and Amount Excluded from Effectiveness Testing) Year ended December 31, Year ended December 31, Year ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 Interest rate products $ (82 ) $ (285 ) $(348) $ (1,044 ) $ (2,275 ) $ (3,431 ) $ (11 ) $ — $ — Derivatives Not Designated as Hedging Instruments Gain/(Loss) Recognized in Interest income and other income/(expense), net Year ended December 31, 2015 2014 2013 Interest rate products $ (23 ) $ (3 ) $ (9 ) Credit-risk-related Contingent Features The General Partner has agreements with some of its derivative counterparties that contain a provision where (1) if the General Partner defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the General Partner could also be declared in default on its derivative obligations; or (2) the General Partner could be declared in default on its derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to the General Partner’s default on the indebtedness. Certain of the General Partner’s agreements with its derivative counterparties contain provisions where if there is a change in the General Partner’s financial condition that materially changes the General Partner’s creditworthiness in an adverse manner, the General Partner may be required to fully collateralize its obligations under the derivative instrument. At December 31, 2015 and 2014 , no cash collateral was posted or required to be posted by the General Partner or by a counterparty. The General Partner also has an agreement with a derivative counterparty that incorporates the loan and financial covenant provisions of the General Partner’s indebtedness with a lender affiliate of the derivative counterparty. Failure to comply with these covenant provisions would result in the General Partner being in default on any derivative instrument obligations covered by the agreement. As of December 31, 2015 , the fair value of derivatives in a net liability position that were allocated to the Operating Partnership, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $0.0 . The General Partner has elected not to offset derivative positions in the consolidated financial statements. The table below presents the effect on the Operating Partnership's financial position had the General Partner made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 : Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Received December 31, 2015 $ 8 $ — $ 8 $ — $ — $ 8 December 31, 2014 $ 39 $ — $ 39 $ — $ — $ 39 (a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote. Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Posted December 31, 2015 $ — $ — $ — $ — $ — $ — December 31, 2014 $ 918 $ — $ 918 $ — $ — $ 918 (b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Capital Structure (UNITED DOMIN

Capital Structure (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
United Dominion Reality L.P.
Entity Information [Line Items]
CAPITAL STRUCTURE	CAPITAL STRUCTURE General Partnership Units The General Partner has complete discretion to manage and control the operations and business of the Operating Partnership, which includes but is not limited to the acquisition and disposition of real property, construction of buildings and making capital improvements, and the borrowing of funds from outside lenders or UDR and its subsidiaries to finance such activities. The General Partner can generally authorize, issue, sell, redeem or purchase any OP Unit or securities of the Operating Partnership without the approval of the limited partners. The General Partner can also approve, with regard to the issuances of OP Units, the class or one or more series of classes, with designations, preferences, participating, optional or other special rights, powers and duties including rights, powers and duties senior to limited partnership interests without approval of any limited partners except holders of Class A Limited Partnership Units. There were 110,883 General Partnership units outstanding at December 31, 2015 and 2014 , all of which were held by UDR. Limited Partnership Units At December 31, 2015 and 2014 , there were 183,167,815 limited partnership units outstanding, of which 1,873,332 were Class A Limited Partnership Units. UDR owned 174,114,516 limited partnership units or 95.1% and 174,002,342 limited partnership units or 95.0% at December 31, 2015 and 2014 , respectively. The remaining 9,053,299 or 4.9% and 9,165,473 or 5.0% limited partnership units outstanding were held by non-affiliated partners at December 31, 2015 and 2014 , respectively, of which 1,751,671 were Class A Limited Partnership Units. Subject to the terms of the Operating Partnership Agreement, the limited partners have the right to require the Operating Partnership to redeem all or a portion of the OP Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the Operating Partnership Agreement), provided that such OP Units have been outstanding for at least one year. UDR, as general partner of the Operating Partnership, may, in its sole discretion, purchase the OP Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of common stock of UDR for each OP Unit), as defined in the Operating Partnership Agreement. The non-affiliated limited partners’ capital is adjusted to redemption value at the end of each reporting period with the corresponding offset against UDR’s limited partner capital account based on the redemption rights noted above. The aggregate value upon redemption of the then-outstanding OP Units held by limited partners was $340.1 million and $282.5 million as of December 31, 2015 and 2014 , respectively, based on the value of UDR’s common stock at each period end. A limited partner has no right to receive any distributions from the Operating Partnership on or after the date of redemption of its OP Units. Class A Limited Partnership Units Class A Limited Partnership Units have a cumulative, annual, non-compounded preferred return, which is equal to 8% based on a value of $16.61 per Class A Limited Partnership Unit. Holders of the Class A Limited Partnership Units exclusively possess certain voting rights. The Operating Partnership may not do the following without approval of the holders of the Class A Limited Partnership Units: (i) increase the authorized or issued amount of Class A Limited Partnership Units, (ii) reclassify any other partnership interest into Class A Limited Partnership Units, (iii) create, authorize or issue any obligations or security convertible into or the right to purchase any class of limited partnership units, without the approval of the holders of the Class A Limited Partnership Units, (iv) enter into a merger or acquisition, or (v) amend or modify the Operating Partnership Agreement in a manner that adversely affects the relative rights, preferences or privileges of the Class A Limited Partnership Units. The following table shows OP Units outstanding and OP Unit activity as of and for the years ended December 31, 2015 , 2014 , and 2013 : Class A Limited Partner UDR, Inc. Limited Partners Limited Partner General Partner Total Ending balance at December 31, 2012 1,751,671 7,643,548 174,775,152 110,883 184,281,254 OP Units redeemed for the distribution of real estate to the General partner (a) — — (1,002,556 ) — (1,002,556 ) OP redemptions for UDR stock — (76,295 ) 76,295 — — Ending balance at December 31, 2013 1,751,671 7,567,253 173,848,891 110,883 183,278,698 OP redemptions for UDR stock — (153,451 ) 153,451 — — Ending balance at December 31, 2014 1,751,671 7,413,802 174,002,342 110,883 183,278,698 OP redemptions for UDR stock — (112,174 ) 112,174 — — Ending balance at December 31, 2015 1,751,671 7,301,628 174,114,516 110,883 183,278,698 (a) In November 2013, the Operating Partnership distributed the development property Los Alisos to the General Partner as a capital distribution. Upon the distribution of the property, the Operating Partnership redeemed 1,002,556 limited partnership units owned by UDR and affiliated entities, resulting in a capital reduction of $23.3 million . Allocation of Profits and Losses Profit of the Operating Partnership is allocated in the following order: (i) to the General Partner and the Limited Partners in proportion to and up to the amount of cash distributions made during the year, and (ii) to the General Partner and Limited Partners in accordance with their percentage interests. Losses and depreciation and amortization expenses, non-recourse liabilities are allocated to the General Partner and Limited Partners in accordance with their percentage interests. Losses allocated to the Limited Partners are capped to the extent that such an allocation would not cause a deficit in the Limited Partners capital account. Such losses are, therefore, allocated to the General Partner. If any Partner’s capital balance were to fall into a deficit any income and gains are allocated to each Partner sufficient to eliminate its negative capital balance.

Income_(Loss) Per Share (UNITED

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Notes)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Text Block]	INCOME/(LOSS) PER SHARE The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per share: Income/(loss) from continuing operations $ 105,482 $ 16,260 $ 2,340 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,572 — (Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) 48 (Income)/loss from continuing operations attributable to noncontrolling interests (3 ) 3 60 Income/(loss) from continuing operations attributable to UDR, Inc. 340,383 154,324 2,448 Distributions to preferred stockholders - Series E (Convertible) (3,722 ) (3,724 ) (3,724 ) Income/(loss) from continuing operations attributable to common stockholders - basic 336,661 150,600 (1,276 ) Dilutive distributions to preferred stockholders - Series E (Convertible) 3,722 — — Income/(loss) from continuing operations attributable to common stockholders - dilutive $ 340,383 $ 150,600 $ (1,276 ) Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 (Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership — — (1,578 ) Income/(loss) from discontinued operations attributable to common stockholders $ — $ 10 $ 42,364 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Denominator for income/(loss) per share - basic and diluted: Weighted average common shares outstanding 259,873 252,707 250,684 Non-vested restricted stock awards (1,204 ) (1,179 ) (715 ) Denominator for income/(loss) per share - basic 258,669 251,528 249,969 Incremental shares issuable from assumed conversion of dilutive preferred stock, stock options and unvested restricted stock 5,083 1,917 — Denominator for income/(loss) per share - diluted 263,752 253,445 249,969 Income/(loss) per weighted average common share - basic: Income/(loss) from continuing operations attributable to common stockholders $ 1.30 $ 0.60 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.30 $ 0.60 $ 0.16 Income/(loss) per weighted average common share - diluted: Income/(loss) from continuing operations attributable to common stockholders $ 1.29 $ 0.59 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.29 $ 0.59 $ 0.16 Basic income/(loss) per common share is computed based upon the weighted average number of common shares outstanding. Diluted income/(loss) per share is computed based upon the common shares issuable from the assumed conversion of the OP Units and DownREIT Units, convertible preferred stock, stock options, and restricted stock. Only those instruments having a dilutive impact on our basic income/(loss) per share are included in diluted income/(loss) per share during the periods. For the year ended December 31, 2015 , the Company’s Series E preferred stock, stock options, and unvested restricted stock were dilutive. The effect of the conversion of the OP Units and DownREIT Units was not dilutive, and therefore not included in the above calculations. For the year ended December 31, 2014 , the Company’s stock options and unvested restricted stock were dilutive for purposes of calculating income/(loss) per share. The effect of the conversion of the OP Units and the Company’s Series E preferred stock were not dilutive, and therefore not included in the above calculations. For the year ended December 31, 2013, the effect of the conversion of the OP Units, the Company’s Series E preferred stock, stock options and restricted stock were not included in the above calculations as the Company reported a loss from continuing operations attributable to common stockholders. The following table sets forth the additional shares of common stock outstanding by equity instrument if converted to common stock for each of the years ended December 31, 2015 , 2014 , and 2013 (shares in thousands) : Year Ended December 31, 2015 2014 2013 OP Units 12,947 9,247 9,337 DownREIT Units 16,229 — — Preferred Stock 3,032 3,036 3,036 Stock options and unvested restricted stock 2,051 1,917 1,584
United Dominion Reality L P [Member]
Earnings Per Share [Text Block]	INCOME/(LOSS) PER OPERATING PARTNERSHIP UNIT Basic income/(loss) per OP Unit is computed by dividing net income/(loss) attributable to general and limited partner unitholders by the weighted average number of general and limited partner units (including redeemable OP Units) outstanding during the year. Diluted income/(loss) per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units or resulted in the issuance of OP Units and then shared in the income/(loss) of the Operating Partnership. For the years ended December 31, 2015 , 2014 , and 2013 , there were no dilutive instruments, and therefore, diluted income/(loss) per OP Unit and basic income/(loss) per OP Unit are the same. See Note 10, Capital Structure , for further discussion on redemption rights of OP Units. The following table sets forth the computation of basic and diluted income/(loss) per OP Unit for the periods presented ( dollars in thousands, except per OP Unit data ): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per OP Unit — basic and diluted: Income/(loss) from continuing operations $ 56,940 $ 33,544 $ 32,766 Gain/(loss) on sale of real estate owned 158,123 63,635 — (Income)/loss from continuing operations attributable to noncontrolling interests (1,762 ) (952 ) (4,114 ) Income/(loss) from continuing operations attributable to OP unitholders $ 213,301 $ 96,227 $ 28,652 Income/(loss) from discontinued operations $ — $ — $ 45,176 (Income)/loss from discontinued operations attributable to noncontrolling interests — — (452 ) Income/(loss) from discontinued operations attributable to OP unitholders $ — $ — $ 44,724 Net income/(loss) $ 215,063 $ 97,179 $ 77,942 Net (income)/loss attributable to noncontrolling interests (1,762 ) (952 ) (4,566 ) Net income/(loss) attributable to OP unitholders $ 213,301 $ 96,227 $ 73,376 Denominator for income/(loss) per OP Unit — basic and diluted: Weighted average OP Units outstanding — basic and diluted 183,279 183,279 184,196 Income/(loss) per weighted average OP Unit — basic and diluted: Income/(loss) from continuing operations attributable to OP unitholders $ 1.16 $ 0.53 $ 0.16 Income/(loss) from discontinued operations attributable to OP unitholders — — 0.24 Net income/(loss) attributable to OP unitholders $ 1.16 $ 0.53 $ 0.40

Commitments and Contingencies (

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Commitments Real Estate Under Development The following summarizes the Company’s real estate commitments at December 31, 2015 ( dollars in thousands ): Number of Properties Costs Incurred to Date (a) Expected Costs to Complete (unaudited) Average Ownership Stake Wholly-owned — under development 1 $ 124,072 (b) $ 217,928 100 % Wholly-owned — redevelopment 3 11,302 (b) 16,698 100 % Joint ventures: Unconsolidated joint ventures 4 497,350 81,979 (c) Various Participating loan investments 1 90,747 (d) 2,711 (e) 0 % Preferred equity investments 5 136,327 (f) — 48 % Total $ 859,798 $ 319,316 (a) Represents 100% of project costs incurred to date. (b) Costs incurred to date include $12.6 million and $1.2 million of accrued fixed assets for development and redevelopment, respectively. (c) Represents UDR’s proportionate share of expected remaining costs to complete. (d) Represents the participating loan balance funded as of December 31, 2015 . (e) Represents UDR’s remaining participating loan commitment for Steele Creek. (f) Represents UDR’s share of capital contributed to the West Coast Development Joint Venture as of December 31, 2015 . Ground and Other Leases UDR owns six communities which are subject to ground leases expiring between 2019 and 2103 . In addition, UDR is a lessee to various operating leases related to office space rented by the Company with expiration dates through 2017 . Future minimum lease payments as of December 31, 2015 are as follows (dollars in thousands): Ground Leases (a) Office Space 2016 $ 5,444 $ 207 2017 5,444 179 2018 5,444 76 2019 5,444 76 2020 4,486 76 Thereafter 311,858 32 Total $ 338,120 $ 646 (a) For purposes of our ground lease contracts, the Company uses the minimum lease payment, if stated in the agreement. For ground lease agreements where there is a reset provision based on the communities appraised value or consumer price index but does not include a specified minimum lease payment, the Company uses the current rent over the remainder of the lease term. UDR incurred $5.5 million , $5.4 million , and $5.2 million of ground rent expense for the years ended December 31, 2015 , 2014 , and 2013 , respectively. These costs are reported within the line item Other Operating Expenses on the Consolidated Statements of Operations. The Company incurred $0.3 million , $1.3 million , and $1.3 million of rent expense related to office space for the years ended December 31, 2015 , 2014 , and 2013 , respectively. These costs are included in General and Administrative on the Consolidated Statements of Operations. In February 2015, the Company acquired the office building in Highlands Ranch, Colorado, which housed its corporate offices it had previously leased. See Note 4, Real Estate Owned, for additional details. Contingencies Litigation and Legal Matters The Company is subject to various legal proceedings and claims arising in the ordinary course of business. The Company cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The Company believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on our financial condition, results of operations or cash flow.
United Dominion Reality L.P.
Entity Information [Line Items]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Commitments Real Estate Under Development The following summarizes the Operating Partnership’s real estate commitments at December 31, 2015 ( dollars in thousands ): Number of Properties Costs Incurred to Date (a) Expected Costs to Complete (unaudited) Real estate communities — redevelopment 2 $ 10,093 $ 13,907 (a) Costs incurred to date include $0.7 million of accrued fixed assets for redevelopment. Ground Leases The Operating Partnership owns five communities, which are subject to ground leases expiring between 2019 and 2103. Future minimum lease payments as of December 31, 2015 are $5.4 million for each of the years ending December 31, 2016 to 2019, $4.5 million for the year ending December 31, 2020, and a total of $311.9 million for years thereafter. For purposes of our ground lease contracts, the Operating Partnership uses the minimum lease payment, if stated in the agreement. For ground lease agreements where there is a reset provision based on the communities appraised value or consumer price index but does not include a specified minimum lease payment, the Operating Partnership uses the current rent over the remainder of the lease term. The Operating Partnership incurred $5.4 million , $5.3 million , and $5.1 million of ground rent expense for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Contingencies Litigation and Legal Matters The Operating Partnership is subject to various legal proceedings and claims arising in the ordinary course of business. The Operating Partnership cannot determine the ultimate liability with respect to such legal proceedings and claims at this time. The General Partner believes that such liability, to the extent not provided for through insurance or otherwise, will not have a material adverse effect on the Operating Partnership’s financial condition, results of operations or cash flow.

Reportable Segments (UNITED DOM

Reportable Segments (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
REPORTABLE SEGMENTS	REPORTABLE SEGMENTS GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. UDR’s chief operating decision maker is comprised of several members of its executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments. UDR owns and operates multifamily apartment communities that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures for UDR’s apartment communities are rental income and NOI. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as rental income less direct property rental expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations, and land rent. UDR’s chief operating decision maker utilizes NOI as the key measure of segment profit or loss. UDR’s two reportable segments are Same-Store Communities and Non-Mature Communities/Other : • Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2014 and held as of December 31, 2015 . A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior year, there is no plan to conduct substantial redevelopment activities, and the community is not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months. • Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities , including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties. Management evaluates the performance of each of our apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Company’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker. All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of UDR’s total revenues during the years ended December 31, 2015 , 2014 , and 2013 . The following table details rental income and NOI from continuing and discontinued operations for UDR’s reportable segments for the years ended December 31, 2015 , 2014 , and 2013 , and reconciles NOI to Net income/(loss) attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Reportable apartment home segment rental income Same-Store Communities West Region $ 255,346 $ 236,175 $ 214,324 Mid-Atlantic Region 157,158 154,491 150,489 Southeast Region 103,920 98,061 93,479 Northeast Region 86,048 81,500 77,299 Southwest Region 57,670 54,810 52,302 Non-Mature Communities/Other 211,786 180,112 167,743 Total segment and consolidated rental income $ 871,928 $ 805,149 $ 755,636 Reportable apartment home segment NOI Same-Store Communities West Region $ 190,682 $ 171,973 $ 152,108 Mid-Atlantic Region 108,324 107,592 105,300 Southeast Region 69,820 65,053 61,087 Northeast Region 64,539 61,315 57,350 Southwest Region 35,767 33,725 31,925 Non-Mature Communities/Other 144,737 116,663 106,271 Total segment and consolidated NOI 613,869 556,321 514,041 Reconciling items: Joint venture management and other fees 22,710 13,044 12,442 Property management (23,978 ) (22,142 ) (20,780 ) Other operating expenses (9,708 ) (8,271 ) (7,136 ) Real estate depreciation and amortization (374,598 ) (358,154 ) (341,490 ) General and administrative (59,690 ) (47,800 ) (42,238 ) Casualty-related recoveries/(charges), net (2,335 ) (541 ) 12,253 Other depreciation and amortization (6,679 ) (5,775 ) (6,741 ) Income/(loss) from unconsolidated entities 62,329 (7,006 ) (415 ) Interest expense (121,875 ) (130,454 ) (126,083 ) Interest income and other income/(expense), net 1,551 11,837 4,681 Tax benefit/(provision), net 3,886 15,136 7,299 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,647 40,449 Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) (1,530 ) Net (income)/loss attributable to noncontrolling interests (3 ) 3 60 Net income/(loss) attributable to UDR, Inc. $ 340,383 $ 154,334 $ 44,812 The following table details the assets of UDR’s reportable segments as of December 31, 2015 and 2014 (dollars in thousands) : December 31, December 31, Reportable apartment home segment assets: Same-Store communities: West Region $ 2,371,615 $ 2,336,271 Mid-Atlantic Region 1,423,888 1,440,561 Southeast Region 730,060 727,933 Northeast Region 1,109,354 1,076,656 Southwest Region 450,305 440,587 Non-mature Communities/Other 3,105,054 2,361,251 Total segment assets 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Total segment assets — net book value 6,543,402 5,948,487 Reconciling items: Cash and cash equivalents 6,742 15,224 Restricted cash 20,798 22,340 Notes receivable, net 16,694 14,369 Investment in and advances to unconsolidated joint ventures, net 938,906 718,226 Other assets 137,302 110,082 Total consolidated assets $ 7,663,844 $ 6,828,728 Capital expenditures related to our Same-Store Communities totaled $72.3 million , $52.5 million , and $43.0 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $12.9 million , $10.9 million , and $12.8 million for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Markets included in the above geographic segments are as follows: i. West Region — Orange County, San Francisco, Seattle, Los Angeles, Monterey Peninsula, Other Southern California, and Portland ii. Mid-Atlantic Region — Metropolitan D.C., Baltimore, and Richmond iii. Southeast Region — Orlando, Nashville, Tampa and Other Florida iv. Northeast Region — New York and Boston v. Southwest Region — Dallas and Austin
United Dominion Reality L.P.
Entity Information [Line Items]
REPORTABLE SEGMENTS	REPORTABLE SEGMENTS GAAP guidance requires that segment disclosures present the measure(s) used by the chief operating decision maker to decide how to allocate resources and for purposes of assessing such segments’ performance. The Operating Partnership has the same chief operating decision maker as that of its parent, the General Partner. The chief operating decision maker consists of several members of UDR’s executive management team who use several generally accepted industry financial measures to assess the performance of the business for our reportable operating segments. The Operating Partnership owns and operates multifamily apartment communities throughout the United States that generate rental and other property related income through the leasing of apartment homes to a diverse base of tenants. The primary financial measures of the Operating Partnership’s apartment communities are rental income and NOI, and are included in the chief operating decision maker’s assessment of UDR’s performance on a consolidated basis. Rental income represents gross market rent less adjustments for concessions, vacancy loss and bad debt. NOI is defined as total revenues less direct property operating expenses. Rental expenses include real estate taxes, insurance, personnel, utilities, repairs and maintenance, administrative and marketing. Excluded from NOI is property management expense, which is calculated as 2.75% of property revenue to cover the regional supervision and accounting costs related to consolidated property operations and land rent. The chief operating decision maker of the General Partner utilizes NOI as the key measure of segment profit or loss. The Operating Partnership’s two reportable segments are Same-Store Communities and Non-Mature/Other communities: • Same-Store Communities represent those communities acquired, developed, and stabilized prior to January 1, 2014 and held as of December 31, 2015 . A comparison of operating results from the prior year is meaningful as these communities were owned and had stabilized occupancy and operating expenses as of the beginning of the prior year, there is no plan to conduct substantial redevelopment activities, and the communities are not held for disposition within the current year. A community is considered to have stabilized occupancy once it achieves 90% occupancy for at least three consecutive months. • Non-Mature Communities/Other represent those communities that do not meet the criteria to be included in Same-Store Communities , including, but not limited to, recently acquired, developed and redeveloped communities, and the non-apartment components of mixed use properties. Management of the General Partner evaluates the performance of each of the Operating Partnership's apartment communities on a Same-Store Community and Non-Mature Community/Other basis, as well as individually and geographically. This is consistent with the aggregation criteria under GAAP as each of our apartment communities generally has similar economic characteristics, facilities, services, and tenants. Therefore, the Operating Partnership’s reportable segments have been aggregated by geography in a manner identical to that which is provided to the chief operating decision maker. All revenues are from external customers and no single tenant or related group of tenants contributed 10% or more of the Operating Partnership’s total revenues during the years ended December 31, 2015 , 2014 , and 2013 . The following table details rental income and NOI from continuing and discontinued operations for the Operating Partnership’s reportable segments for the years ended December 31, 2015 , 2014 , and 2013 , and reconciles NOI to Net income/(loss) attributable to OP unitholders in the Consolidated Statements of Operations (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Reportable apartment home segment rental income Same-Store Communities West Region $ 174,414 $ 160,185 $ 150,137 Mid-Atlantic Region 60,602 65,565 64,923 Southeast Region 44,981 42,568 40,730 Northeast Region 59,444 58,788 55,850 Southwest Region 20,963 26,580 25,614 Non-Mature Communities/Other 80,004 68,948 73,588 Total segment and consolidated rental income $ 440,408 $ 422,634 $ 410,842 Reportable apartment home segment NOI Same-Store Communities West Region $ 130,509 $ 117,130 $ 107,866 Mid-Atlantic Region 40,301 44,366 44,442 Southeast Region 30,106 28,111 26,590 Northeast Region 45,917 45,347 42,146 Southwest Region 13,176 16,821 16,057 Non-Mature Communities/Other 57,588 48,538 50,434 Total segment and consolidated NOI 317,597 300,313 287,535 Reconciling items: Property management (12,111 ) (11,622 ) (11,298 ) Other operating expenses (5,923 ) (5,172 ) (5,728 ) Real estate depreciation and amortization (169,784 ) (179,176 ) (181,302 ) General and administrative (27,016 ) (28,541 ) (24,808 ) Casualty-related recoveries/(charges), net (843 ) (541 ) 8,083 Income/(loss) from unconsolidated entities (4,659 ) — — Interest expense (40,321 ) (41,717 ) (36,058 ) Gain/(loss) on sale of real estate owned, net of tax 158,123 63,635 41,518 Net income/(loss) attributable to noncontrolling interests (1,762 ) (952 ) (4,566 ) Net income/(loss) attributable to OP unitholders $ 213,301 $ 96,227 $ 73,376 The following table details the assets of the Operating Partnership’s reportable segments as of December 31, 2015 and 2014 (dollars in thousands) : December 31, December 31, 2014 Reportable apartment home segment assets Same-Store Communities West Region $ 1,461,078 $ 1,433,827 Mid-Atlantic Region 410,710 686,708 Southeast Region 321,787 316,788 Northeast Region 669,082 777,375 Southwest Region — 228,997 Non-Mature Communities/Other 768,248 795,075 Total segment assets 3,630,905 4,238,770 Accumulated depreciation (1,281,258 ) (1,403,303 ) Total segment assets - net book value 2,349,647 2,835,467 Reconciling items: Cash and cash equivalents 3,103 502 Restricted cash 11,344 13,811 Investment in unconsolidated entities 166,186 — Other assets 24,528 24,029 Total consolidated assets $ 2,554,808 $ 2,873,809 Capital expenditures related to the Operating Partnership’s Same-Store Communities totaled $40.0 million and $30.6 million for the years ended December 31, 2015 and 2014 , respectively. Capital expenditures related to the Operating Partnership’s Non-Mature Communities/Other totaled $5.0 million and $3.2 million for the years ended December 31, 2015 and 2014 , respectively. Markets included in the above geographic segments are as follows: i. West Region — Orange County, San Francisco, Seattle, Los Angeles, Monterey Peninsula, Other Southern California, and Portland ii. Mid-Atlantic Region — Metropolitan, D.C. and Baltimore iii. Northeast Region — New York and Boston iv. Southeast Region — Nashville, Tampa, and Other Florida v. Southwest Regio n — Dallas and Austin In October 2015, all communities within the Southwest Region were contributed to the DownREIT Partnership and deconsolidated. See Note 5, Unconsolidated Entities.

Hurricane Related Charges (UNIT

Hurricane Related Charges (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Hurricane Related Charges	-RELATED (RECOVERIES)/CHARGES During the year ended December 31, 2015, the Company recorded $2.3 million of casualty-related losses due to property damage caused by the severe snow storms on the east coast in early 2015 and water damage at a community, all of which are included in Casualty-related charges/(recoveries), net on the Consolidated Statements of Operations. During the year ended December 31, 2014, the Company recorded $0.5 million of casualty-related losses due to property damage incurred during an earthquake and a storm in California, all of which are included in Casualty-related charges/(recoveries), net on the Consolidated Statements of Operations. During the year ended December 31, 2013, the Company recorded $12.3 million of casualty-related recoveries related to damage caused by Hurricane Sandy on the east coast in October 2012, all of which are included in Casualty-related charges/(recoveries), net on the Consolidated Statements of Operations.
United Dominion Reality L.P.
Entity Information [Line Items]
Hurricane Related Charges	-RELATED (RECOVERIES)/CHARGES

Unaudited Summarized Consolid46

Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA	UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA Selected consolidated quarterly financial data for the years ended December 31, 2015 and 2014 is summarized in the table below (dollars in thousands, except per share amounts) : Three Months Ended March 31, June 30, September 30, December 31, 2015 Rental income $ 207,047 $ 212,764 $ 217,765 $ 234,352 Income/(loss) from continuing operations 76,417 10,842 13,695 4,528 Net income/(loss) attributable to common stockholders (a) 72,891 85,924 12,361 161,270 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic $ 0.28 $ 0.33 $ 0.05 $ 0.62 Diluted $ 0.28 $ 0.33 $ 0.05 $ 0.61 Weighted average number of shares outstanding Basic 256,834 257,849 259,114 260,830 Diluted 258,662 262,806 261,207 266,108 2014 Rental income (b) $ 194,352 $ 200,959 $ 203,587 $ 206,104 Income/(loss) from continuing operations (5,195 ) 4,359 10,611 6,485 Income/(loss) from discontinued operations, net of tax (87 ) 18 79 — Net income/(loss) attributable to common stockholders (a) 17,430 29,076 39,618 64,486 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic and diluted $ 0.07 $ 0.12 $ 0.16 $ 0.25 Weighted average number of shares outstanding Basic 250,177 250,255 251,655 253,983 Diluted 251,822 252,191 253,732 256,000 (a) Due to the quarterly pro-rata calculation of noncontrolling interest and rounding, the sum of the quarterly per share and/or dollar amounts may not equal the annual totals. (b) Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
United Dominion Reality L.P.
Entity Information [Line Items]
UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA	UNAUDITED SUMMARIZED CONSOLIDATED QUARTERLY FINANCIAL DATA Selected consolidated quarterly financial data for the years ended December 31, 2015 and 2014 is summarized in the table blow ( dollars in thousands, except per share amounts ): Three Months Ended March 31, June 30, September 30, December 31, 2015 Rental income $ 110,095 $ 113,158 $ 115,173 $ 101,982 Income/(loss) from continuing operations 12,117 15,355 14,952 14,516 Income/(loss) attributable to OP unitholders 36,346 47,383 14,617 114,955 Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (a) $ 0.20 $ 0.26 $ 0.08 $ 0.62 2014 Rental income $ 102,370 $ 104,842 $ 107,444 $ 107,978 Income/(loss) from continuing operations 6,411 8,319 8,875 9,939 Income/(loss) attributable to OP unitholders 30,533 24,426 8,637 32,631 Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (a) $ 0.17 $ 0.13 $ 0.05 $ 0.18 (a) Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts.

Schedule - III Real Estate Owne

Schedule - III Real Estate Owned	12 Months Ended
	Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate Owned	Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired WEST REGION Harbor at Mesa Verde $ 61,050 $ 20,476 $ 28,538 $ 49,014 $ 14,641 $ 21,314 $ 42,341 $ 63,655 $ 27,697 2003 Jun-03 27 Seventy Five Mesa Verde 36,423 99,329 110,644 209,973 92,673 112,650 189,996 302,646 87,007 1972/2013 Oct-04 Pacific Shores 42,552 7,345 22,624 29,969 9,913 7,913 31,969 39,882 20,771 2003 Jun-03 Huntington Vista 36,980 8,055 22,486 30,541 11,612 8,713 33,440 42,153 19,810 1970 Jun-03 Missions at Back Bay — 229 14,129 14,358 2,526 10,874 6,010 16,884 4,229 1969 Dec-03 Coronado at Newport — North — 62,516 46,082 108,598 29,014 66,770 70,842 137,612 44,814 2000 Oct-04 Vista Del Rey — 10,670 7,080 17,750 2,502 10,988 9,264 20,252 6,117 1969 Sep-04 Foxborough — 12,071 6,187 18,258 2,897 12,404 8,751 21,155 5,432 1969 Sep-04 Coronado South — 58,785 50,067 108,852 19,393 59,278 68,967 128,245 43,476 2000 Mar-05 1818 Platinum Triangle — 16,663 51,905 68,568 1,488 16,822 53,234 70,056 16,975 2009 Aug-10 Beach & Ocean — 12,878 — 12,878 38,710 13,007 38,581 51,588 2,841 2014 Aug-11 The Residences at Bella Terra — 25,000 — 25,000 125,818 25,058 125,760 150,818 19,253 2013 Oct-11 Los Alisos at Mission Viejo — 17,298 — 17,298 70,345 16,398 71,245 87,643 9,016 2014 Jun-04 ORANGE COUNTY, CA 177,005 351,315 359,742 711,057 421,532 382,189 750,400 1,132,589 307,438 2000 Post Street — 9,861 44,578 54,439 30,040 13,541 70,938 84,479 31,789 1987/2006 Dec-98 Birch Creek — 4,365 16,696 21,061 7,536 5,139 23,458 28,597 13,756 1968 Dec-98 Highlands Of Marin — 5,996 24,868 30,864 26,063 7,257 49,670 56,927 29,237 2010 Dec-98 Marina Playa — 6,224 23,916 30,140 10,032 6,938 33,234 40,172 19,547 1971 Dec-98 River Terrace 39,310 22,161 40,137 62,298 4,307 22,428 44,177 66,605 25,943 2005 Aug-05 CitySouth — 14,031 30,537 44,568 35,627 16,290 63,905 80,195 36,437 2012 Nov-05 Bay Terrace — 8,545 14,458 23,003 5,046 11,458 16,591 28,049 9,622 1962 Oct-05 Highlands of Marin Phase II — 5,353 18,559 23,912 11,088 5,758 29,242 35,000 15,221 2010 Oct-07 Edgewater — 30,657 83,872 114,529 3,689 30,690 87,528 118,218 39,217 2007 Mar-08 Almaden Lake Village 27,000 594 42,515 43,109 6,031 773 48,367 49,140 21,469 1999 Jul-08 388 Beale — 14,253 74,104 88,357 6,271 14,316 80,312 94,628 21,255 1999 Apr-11 Channel Mission Bay — 23,625 — 23,625 128,433 23,662 128,396 152,058 15,675 2014 Sep-10 SAN FRANCISCO, CA 66,310 145,665 414,240 559,905 274,163 158,250 675,818 834,068 279,168 Crowne Pointe — 2,486 6,437 8,923 5,666 2,868 11,721 14,589 7,585 1987 Dec-98 Hilltop — 2,174 7,408 9,582 4,328 2,724 11,186 13,910 6,895 1985 Dec-98 The Hawthorne 34,934 6,474 30,226 36,700 4,621 6,644 34,677 41,321 20,306 2003 Jul-05 The Kennedy — 6,179 22,307 28,486 1,931 6,272 24,145 30,417 13,947 2005 Nov-05 Hearthstone at Merrill Creek 22,591 6,848 30,922 37,770 3,829 6,975 34,624 41,599 15,574 2000 May-08 Island Square — 21,284 89,389 110,673 4,695 21,428 93,940 115,368 40,021 2007 Jul-08 Borgata — 6,379 34,569 40,948 (7,991 ) 6,404 26,553 32,957 12,502 2001 May-07 elements too — 27,468 72,036 99,504 15,676 30,244 84,936 115,180 39,911 2010 Feb-10 989elements — 8,541 45,990 54,531 1,968 8,578 47,921 56,499 16,491 2006 Dec-09 Lightbox — 6,449 38,884 45,333 422 6,449 39,306 45,755 3,374 2014 Aug-14 Waterscape — 9,693 65,176 74,869 613 9,694 65,788 75,482 4,924 2014 Sep-14 SEATTLE, WA 57,525 103,975 443,344 547,319 35,758 108,280 474,797 583,077 181,530 Rosebeach — 8,414 17,449 25,863 3,450 8,760 20,553 29,313 12,675 1970 Sep-04 Tierra Del Rey 43,078 39,586 36,679 76,265 3,250 39,674 39,841 79,515 18,883 1999 Dec-07 The Westerly 67,700 48,182 102,364 150,546 37,220 50,722 137,044 187,766 46,474 2013 Sep-10 Jefferson at Marina del Rey — 55,651 — 55,651 90,660 61,455 84,856 146,311 32,288 2008 Sep-07 LOS ANGELES, CA 110,778 151,833 156,492 308,325 134,580 160,611 282,294 442,905 110,320 Boronda Manor — 1,946 8,982 10,928 9,534 3,195 17,267 20,462 9,244 1979 Dec-98 Garden Court — 888 4,188 5,076 5,435 1,559 8,952 10,511 4,981 1973 Dec-98 Cambridge Court — 3,039 12,883 15,922 14,767 5,302 25,387 30,689 13,958 1974 Dec-98 Laurel Tree — 1,304 5,115 6,419 6,080 2,188 10,311 12,499 5,627 1977 Dec-98 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired The Pointe At Harden Ranch — 6,388 23,854 30,242 27,357 10,021 47,578 57,599 24,926 1986 Dec-98 The Pointe At Northridge — 2,044 8,028 10,072 10,089 3,295 16,866 20,161 9,293 1979 Dec-98 The Pointe At Westlake — 1,329 5,334 6,663 6,364 2,181 10,846 13,027 5,700 1975 Dec-98 MONTEREY PENINSULA, CA — 16,938 68,384 85,322 79,626 27,741 137,207 164,948 73,729 Verano at Rancho Cucamonga Town Square 55,263 13,557 3,645 17,202 53,949 23,255 47,896 71,151 34,875 2006 Oct-02 Windemere at Sycamore Highland — 5,810 23,450 29,260 2,964 6,129 26,095 32,224 17,614 2001 Nov-02 Villas at Carlsbad — 6,517 10,718 17,235 2,876 6,780 13,331 20,111 7,826 1966 Oct-04 OTHER SOUTHERN CA 55,263 25,884 37,813 63,697 59,789 36,164 87,322 123,486 60,315 Tualatin Heights — 3,273 9,134 12,407 6,745 3,841 15,311 19,152 10,231 1989 Dec-98 Hunt Club — 6,014 14,870 20,884 6,866 6,395 21,355 27,750 14,364 1985 Sep-04 PORTLAND, OR — 9,287 24,004 33,291 13,611 10,236 36,666 46,902 24,595 TOTAL WEST REGION 466,881 804,897 1,504,019 2,308,916 1,019,059 883,471 2,444,504 3,327,975 1,037,095 MID-ATLANTIC REGION Dominion Middle Ridge 29,344 3,311 13,283 16,594 6,816 3,850 19,560 23,410 14,076 1990 Jun-96 Dominion Lake Ridge 20,047 2,366 8,387 10,753 7,490 2,866 15,377 18,243 10,431 1987 Feb-96 Presidential Greens — 11,238 18,790 30,028 9,883 11,680 28,231 39,911 19,977 1938 May-02 The Whitmore — 6,418 13,411 19,829 20,734 7,495 33,068 40,563 22,988 2008 Apr-02 Ridgewood — 5,612 20,086 25,698 8,522 6,014 28,206 34,220 20,340 1988 Aug-02 DelRay Tower — 297 12,786 13,083 113,357 9,461 116,979 126,440 9,914 2014 Jan-08 Waterside Towers — 1,139 49,657 50,796 18,261 36,233 32,824 69,057 20,975 1971 Dec-03 Wellington Place at Olde Town 32,037 13,753 36,059 49,812 17,416 14,740 52,488 67,228 35,000 2008 Sep-05 Andover House — 14,357 51,577 65,934 3,769 14,379 55,324 69,703 27,837 2004 Mar-07 Sullivan Place — 1,137 103,676 104,813 7,066 1,364 110,515 111,879 51,643 2007 Dec-07 Circle Towers 70,884 32,815 107,051 139,866 13,056 33,357 119,565 152,922 53,022 1972 Mar-08 Delancey at Shirlington — 21,606 66,765 88,371 2,195 21,632 68,934 90,566 30,609 2006/2007 Mar-08 View 14 — 5,710 97,941 103,651 2,888 5,721 100,818 106,539 25,845 2009 Jun-11 Signal Hill — 13,290 — 13,290 69,769 25,510 57,549 83,059 25,243 2010 Mar-07 Capitol View on 14th — 31,393 — 31,393 94,714 31,395 94,712 126,107 17,603 2013 Sep-07 Domain College Park 31,337 7,300 — 7,300 58,032 7,307 58,025 65,332 8,008 2014 Jun-11 1200 East West — 9,748 68,022 77,770 85 9,749 68,106 77,855 878 2010 Oct-15 Courts at Huntington Station — 27,749 111,878 139,627 78 27,749 111,956 139,705 1,682 2011 Oct-15 Eleven55 Ripley — 15,566 107,539 123,105 76 15,566 107,615 123,181 1,402 2014 Oct-15 Arbor Park of Alexandria 95,818 50,881 159,728 210,609 99 50,881 159,827 210,708 2,428 1969/2015 Oct-15 Courts at Dulles — 14,697 83,834 98,531 150 14,700 83,981 98,681 1,277 2000 Oct-15 Newport Village 127,600 55,283 177,454 232,737 475 55,285 177,927 233,212 2,704 1968 Oct-15 METROPOLITAN, D.C. 407,067 345,666 1,307,924 1,653,590 454,931 406,934 1,701,587 2,108,521 403,882 Dominion Kings Place 14,294 1,565 7,007 8,572 4,484 1,890 11,166 13,056 8,506 1983 Dec-92 Dominion At Eden Brook — 2,361 9,384 11,745 6,787 2,977 15,555 18,532 12,406 1984 Dec-92 Ellicott Grove — 2,920 9,099 12,019 23,363 5,379 30,003 35,382 23,332 2008 Jul-94 Dominion Constant Freindship 8,783 903 4,669 5,572 4,117 1,320 8,369 9,689 6,274 1990 May-95 Lakeside Mill 12,569 2,666 10,109 12,775 5,038 2,997 14,816 17,813 11,336 1989 Dec-99 Calvert’s Walk — 4,408 24,692 29,100 7,396 4,817 31,679 36,496 20,827 1988 Mar-04 Arborview Apartments — 4,653 23,952 28,605 8,090 5,249 31,446 36,695 21,388 1992 Mar-04 Liriope Apartments — 1,620 6,791 8,411 1,374 1,653 8,132 9,785 5,352 1997 Mar-04 20 Lambourne 30,132 11,750 45,590 57,340 6,406 12,106 51,640 63,746 24,313 2003 Mar-08 Domain Brewers Hill — 4,669 40,630 45,299 942 4,700 41,541 46,241 12,690 2009 Aug-10 BALTIMORE, MD 65,778 37,515 181,923 219,438 67,997 43,088 244,347 287,435 146,424 Gayton Pointe Townhomes — 826 5,148 5,974 29,738 3,463 32,249 35,712 27,255 2007 Sep-95 Waterside At Ironbridge — 1,844 13,239 15,083 7,614 2,328 20,369 22,697 13,860 1987 Sep-97 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired Carriage Homes at Wyndham — 474 30,997 31,471 7,959 3,901 35,529 39,430 24,260 1998 Nov-03 Legacy at Mayland 34,567 1,979 11,524 13,503 29,886 4,946 38,443 43,389 32,042 1969/2007 Dec-91 RICHMOND, VA 34,567 5,123 60,908 66,031 75,197 14,638 126,590 141,228 97,417 TOTAL MID-ATLANTIC REGION 507,412 388,304 1,550,755 1,939,059 598,125 464,660 2,072,524 2,537,184 647,723 SOUTHEAST REGION Seabrook — 1,846 4,155 6,001 8,427 2,763 11,665 14,428 9,531 2004 Feb-96 Altamira Place — 1,533 11,076 12,609 20,724 3,539 29,794 33,333 25,586 2007 Apr-94 Regatta Shore — 757 6,608 7,365 16,031 2,060 21,336 23,396 17,330 2007 Jun-94 Alafaya Woods 17,776 1,653 9,042 10,695 9,245 2,555 17,385 19,940 13,299 2006 Oct-94 Los Altos 21,592 2,804 12,349 15,153 10,994 4,058 22,089 26,147 15,263 2004 Oct-96 Lotus Landing — 2,185 8,639 10,824 10,108 2,873 18,059 20,932 11,987 2006 Jul-97 Seville On The Green — 1,282 6,498 7,780 7,249 1,738 13,291 15,029 9,051 2004 Oct-97 Ashton Waterford 23,015 3,872 17,538 21,410 4,563 4,273 21,700 25,973 13,830 2000 May-98 Arbors at Lee Vista — 6,692 12,860 19,552 12,894 7,264 25,182 32,446 19,618 2007 Aug-06 ORLANDO, FL 62,383 22,624 88,765 111,389 100,235 31,123 180,501 211,624 135,495 Legacy Hill — 1,148 5,867 7,015 8,807 1,764 14,058 15,822 11,246 1977 Nov-95 Hickory Run — 1,469 11,584 13,053 10,459 2,155 21,357 23,512 14,244 1989 Dec-95 Carrington Hills — 2,117 — 2,117 34,535 4,506 32,146 36,652 21,305 1999 Dec-95 Brookridge — 708 5,461 6,169 4,830 1,162 9,837 10,999 7,007 1986 Mar-96 Breckenridge — 766 7,714 8,480 4,646 1,285 11,841 13,126 8,155 1986 Mar-97 Colonnade 16,677 1,460 16,015 17,475 5,766 1,952 21,289 23,241 12,268 1998 Jan-99 The Preserve at Brentwood 21,804 3,182 24,674 27,856 7,431 3,641 31,646 35,287 21,056 1998 Jun-04 Polo Park — 4,583 16,293 20,876 16,508 5,741 31,643 37,384 22,411 2008 May-06 NASHVILLE, TN 38,481 15,433 87,608 103,041 92,982 22,206 173,817 196,023 117,692 Summit West — 2,176 4,710 6,886 9,314 3,552 12,648 16,200 11,005 1972 Dec-92 The Breyley — 1,780 2,458 4,238 17,606 3,457 18,387 21,844 16,978 2007 Sep-93 Lakewood Place 18,230 1,395 10,647 12,042 9,654 2,709 18,987 21,696 14,531 1986 Mar-94 Cambridge Woods 12,713 1,791 7,166 8,957 9,042 2,687 15,312 17,999 11,297 1985 Jun-97 Inlet Bay — 7,702 23,150 30,852 15,659 9,304 37,207 46,511 27,055 1988/1989 Jun-03 MacAlpine Place — 10,869 36,858 47,727 7,862 11,545 44,044 55,589 28,780 2001 Dec-04 The Vintage Lofts at West End — 6,611 37,663 44,274 16,107 15,119 45,262 60,381 22,082 2009 Jul-09 TAMPA, FL 30,943 32,324 122,652 154,976 85,244 48,373 191,847 240,220 131,728 The Reserve and Park at Riverbridge 39,179 15,968 56,401 72,369 9,823 16,602 65,590 82,192 40,676 1999/2001 Dec-04 OTHER FLORIDA 39,179 15,968 56,401 72,369 9,823 16,602 65,590 82,192 40,676 TOTAL SOUTHEAST REGION 170,986 86,349 355,426 441,775 288,284 118,304 611,755 730,059 425,591 NORTHEAST REGION 10 Hanover Square — 41,432 218,983 260,415 9,730 41,496 228,649 270,145 54,457 2005 Apr-11 21 Chelsea — 36,399 107,154 143,553 12,592 36,414 119,731 156,145 28,031 2001 Aug-11 View 34 — 114,410 324,920 439,330 96,772 115,026 421,076 536,102 99,652 1985/2013 Jul-11 95 Wall Street — 57,637 266,255 323,892 7,110 57,810 273,192 331,002 71,769 2008 Aug-11 NEW YORK, NY — 249,878 917,312 1,167,190 126,204 250,746 1,042,648 1,293,394 253,909 Garrison Square — 5,591 91,027 96,618 7,226 5,635 98,209 103,844 29,629 1887/1990 Sep-10 Ridge at Blue Hills 22,147 6,039 34,869 40,908 1,479 6,113 36,274 42,387 11,196 2007 Sep-10 Inwood West 54,919 20,778 88,096 108,874 5,121 19,324 94,671 113,995 26,028 2006 Apr-11 14 North — 10,961 51,175 62,136 6,359 11,077 57,418 68,495 16,632 2005 Apr-11 100 Pier 4 — 24,584 — 24,584 190,695 24,584 190,695 215,279 7,259 2015 Dec-15 BOSTON, MA 77,066 67,953 265,167 333,120 210,880 66,733 477,267 544,000 90,744 TOTAL NORTHEAST REGION 77,066 317,831 1,182,479 1,500,310 337,084 317,479 1,519,915 1,837,394 344,653 SOUTHWEST REGION THIRTY377 29,361 24,036 32,951 56,987 9,332 24,382 41,937 66,319 24,256 2007 Aug-06 Legacy Village 82,734 16,882 100,102 116,984 8,827 17,407 108,404 125,811 50,919 6/7/2005 Mar-08 Garden Oaks — 2,132 5,367 7,499 1,812 6,947 2,364 9,311 1,996 1979 Mar-07 Glenwood — 7,903 554 8,457 2,105 8,159 2,403 10,562 1,583 1970 May-07 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired Talisker of Addison — 10,440 634 11,074 2,259 10,845 2,488 13,333 2,026 1975 May-07 Springhaven — 6,688 3,354 10,042 1,543 8,359 3,226 11,585 2,465 1977 Apr-07 Clipper Pointe — 13,221 2,507 15,728 2,615 15,001 3,342 18,343 2,897 1978 May-07 Highlands of Preston — 2,151 8,168 10,319 31,543 6,044 35,818 41,862 26,252 2008 Mar-98 DALLAS, TX 112,095 83,453 153,637 237,090 60,036 97,144 199,982 297,126 112,394 Barton Creek Landing — 3,151 14,269 17,420 22,588 4,913 35,095 40,008 22,924 2010 Mar-02 Residences at the Domain 36,299 4,034 55,256 59,290 3,668 4,281 58,677 62,958 25,547 2007 Aug-08 Red Stone Ranch — 5,084 17,646 22,730 2,111 5,272 19,569 24,841 5,243 2000 Apr-12 Lakeline Villas — 4,148 16,869 21,017 1,495 4,296 18,216 22,512 4,744 2004 Apr-12 AUSTIN, TX 36,299 16,417 104,040 120,457 29,862 18,762 131,557 150,319 58,458 TOTAL SOUTHWEST REGION 148,394 99,870 257,677 357,547 89,898 115,906 331,539 447,445 170,852 TOTAL OPERATING COMMUNITIES 1,370,739 1,697,251 4,850,356 6,547,607 2,332,450 1,899,820 6,980,237 8,880,057 2,625,914 REAL ESTATE UNDER DEVELOPMENT Pacific City — 78,085 — 78,085 45,987 78,085 45,987 124,072 — TOTAL REAL ESTATE UNDER DEVELOPMENT — 78,085 — 78,085 45,987 78,085 45,987 124,072 — LAND Waterside — 11,862 — 11,862 283 12,084 61 12,145 284 345 Harrison Street — 32,938 — 32,938 7,437 32,943 7,432 40,375 — 7 Harcourt — 884 — 884 5,045 804 5,125 5,929 — 2919 Wilshire — 6,773 — 6,773 1,563 6,773 1,563 8,336 553 Vitruvian Park ® — 4,325 — 4,325 9,510 11,319 2,516 13,835 2,098 TOTAL LAND — 56,782 — 56,782 23,838 63,923 16,697 80,620 2,935 HELD FOR DISPOSITION 3032 Wilshire — 9,963 — 9,963 2,643 9,963 2,643 12,606 830 TOTAL HELD FOR DISPOSITION — 9,963 — 9,963 2,643 9,963 2,643 12,606 830 COMMERCIAL Hanover Village — 1,624 — 1,624 — 1,104 520 1,624 553 Circle Towers Office Bldg — 1,407 — 1,407 6,021 1,380 6,048 7,428 2,683 Brookhaven Shopping Center — 4,943 — 4,943 16,785 7,793 13,935 21,728 12,496 Bellevue Plaza retail — 24,377 — 24,377 8,103 29,920 2,560 32,480 772 TOTAL COMMERCIAL — 32,351 — 32,351 30,909 40,197 23,063 63,260 16,504 Other (b) — — — — 5,356 — 5,356 5,356 62 1745 Shea Center I 11,755 3,034 20,534 23,568 737 3,034 21,271 24,305 629 TOTAL CORPORATE 11,755 3,034 20,534 23,568 6,093 3,034 26,627 29,661 691 TOTAL COMMERCIAL & CORPORATE 11,755 35,385 20,534 55,919 37,002 43,231 49,690 92,921 17,195 Deferred Financing Costs $ (5,549 ) TOTAL REAL ESTATE OWNED $ 1,376,945 $ 1,877,466 $ 4,870,890 $ 6,748,356 $ 2,441,920 $ 2,095,022 $ 7,095,254 $ 9,190,276 $ 2,646,874 (a) Date of construction or date of last major renovation. (b) Includes unallocated accruals and capital expenditures. The aggregate cost for federal income tax purposes was approximately $8.3 billion at December 31, 2015. The estimated depreciable lives for all buildings in the latest Consolidated Statements of Operations are 35 to 55 years . 3-YEAR ROLLFORWARD OF REAL ESTATE OWNED AND ACCUMULATED DEPRECIATION The following is a reconciliation of the carrying amount of total real estate owned at December 31, ( in thousands) : 2015 2014 2013 Balance at beginning of the year $ 8,383,259 $ 8,207,977 $ 8,055,828 Real estate acquired 906,446 231,225 — Capital expenditures and development 203,183 326,461 452,057 Real estate sold (301,920 ) (269,681 ) (70,687 ) Real estate contributed to joint ventures — (112,344 ) (356,303 ) Consolidation of joint venture assets — — 129,437 Impairment of assets, including casualty-related impairments (692 ) (379 ) (2,355 ) Balance at end of the year $ 9,190,276 $ 8,383,259 $ 8,207,977 The following is a reconciliation of total accumulated depreciation for real estate owned at December 31, ( in thousands ): 2015 2014 2013 Balance at beginning of the year $ 2,434,772 $ 2,208,794 $ 1,924,682 Depreciation expense for the year 364,622 356,673 339,326 Accumulated depreciation on sales (152,520 ) (126,151 ) (34,794 ) Accumulated depreciation on real estate contributed to joint ventures — (4,228 ) (20,662 ) Accumulated depreciation on assets of consolidated joint ventures — — 1,374 Accumulated depreciation on retirements of fully depreciated assets — — (1,132 ) Write off of accumulated depreciation on casualty-related impaired assets — (316 ) — Balance at end of year $ 2,646,874 $ 2,434,772 $ 2,208,794

Schedule III - Real Estate Owne

Schedule III - Real Estate Owned (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2015
Real Estate and Accumulated Depreciation [Line Items]
Schedule III - Real Estate Owned	Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired WEST REGION Harbor at Mesa Verde $ 61,050 $ 20,476 $ 28,538 $ 49,014 $ 14,641 $ 21,314 $ 42,341 $ 63,655 $ 27,697 2003 Jun-03 27 Seventy Five Mesa Verde 36,423 99,329 110,644 209,973 92,673 112,650 189,996 302,646 87,007 1972/2013 Oct-04 Pacific Shores 42,552 7,345 22,624 29,969 9,913 7,913 31,969 39,882 20,771 2003 Jun-03 Huntington Vista 36,980 8,055 22,486 30,541 11,612 8,713 33,440 42,153 19,810 1970 Jun-03 Missions at Back Bay — 229 14,129 14,358 2,526 10,874 6,010 16,884 4,229 1969 Dec-03 Coronado at Newport — North — 62,516 46,082 108,598 29,014 66,770 70,842 137,612 44,814 2000 Oct-04 Vista Del Rey — 10,670 7,080 17,750 2,502 10,988 9,264 20,252 6,117 1969 Sep-04 Foxborough — 12,071 6,187 18,258 2,897 12,404 8,751 21,155 5,432 1969 Sep-04 Coronado South — 58,785 50,067 108,852 19,393 59,278 68,967 128,245 43,476 2000 Mar-05 1818 Platinum Triangle — 16,663 51,905 68,568 1,488 16,822 53,234 70,056 16,975 2009 Aug-10 Beach & Ocean — 12,878 — 12,878 38,710 13,007 38,581 51,588 2,841 2014 Aug-11 The Residences at Bella Terra — 25,000 — 25,000 125,818 25,058 125,760 150,818 19,253 2013 Oct-11 Los Alisos at Mission Viejo — 17,298 — 17,298 70,345 16,398 71,245 87,643 9,016 2014 Jun-04 ORANGE COUNTY, CA 177,005 351,315 359,742 711,057 421,532 382,189 750,400 1,132,589 307,438 2000 Post Street — 9,861 44,578 54,439 30,040 13,541 70,938 84,479 31,789 1987/2006 Dec-98 Birch Creek — 4,365 16,696 21,061 7,536 5,139 23,458 28,597 13,756 1968 Dec-98 Highlands Of Marin — 5,996 24,868 30,864 26,063 7,257 49,670 56,927 29,237 2010 Dec-98 Marina Playa — 6,224 23,916 30,140 10,032 6,938 33,234 40,172 19,547 1971 Dec-98 River Terrace 39,310 22,161 40,137 62,298 4,307 22,428 44,177 66,605 25,943 2005 Aug-05 CitySouth — 14,031 30,537 44,568 35,627 16,290 63,905 80,195 36,437 2012 Nov-05 Bay Terrace — 8,545 14,458 23,003 5,046 11,458 16,591 28,049 9,622 1962 Oct-05 Highlands of Marin Phase II — 5,353 18,559 23,912 11,088 5,758 29,242 35,000 15,221 2010 Oct-07 Edgewater — 30,657 83,872 114,529 3,689 30,690 87,528 118,218 39,217 2007 Mar-08 Almaden Lake Village 27,000 594 42,515 43,109 6,031 773 48,367 49,140 21,469 1999 Jul-08 388 Beale — 14,253 74,104 88,357 6,271 14,316 80,312 94,628 21,255 1999 Apr-11 Channel Mission Bay — 23,625 — 23,625 128,433 23,662 128,396 152,058 15,675 2014 Sep-10 SAN FRANCISCO, CA 66,310 145,665 414,240 559,905 274,163 158,250 675,818 834,068 279,168 Crowne Pointe — 2,486 6,437 8,923 5,666 2,868 11,721 14,589 7,585 1987 Dec-98 Hilltop — 2,174 7,408 9,582 4,328 2,724 11,186 13,910 6,895 1985 Dec-98 The Hawthorne 34,934 6,474 30,226 36,700 4,621 6,644 34,677 41,321 20,306 2003 Jul-05 The Kennedy — 6,179 22,307 28,486 1,931 6,272 24,145 30,417 13,947 2005 Nov-05 Hearthstone at Merrill Creek 22,591 6,848 30,922 37,770 3,829 6,975 34,624 41,599 15,574 2000 May-08 Island Square — 21,284 89,389 110,673 4,695 21,428 93,940 115,368 40,021 2007 Jul-08 Borgata — 6,379 34,569 40,948 (7,991 ) 6,404 26,553 32,957 12,502 2001 May-07 elements too — 27,468 72,036 99,504 15,676 30,244 84,936 115,180 39,911 2010 Feb-10 989elements — 8,541 45,990 54,531 1,968 8,578 47,921 56,499 16,491 2006 Dec-09 Lightbox — 6,449 38,884 45,333 422 6,449 39,306 45,755 3,374 2014 Aug-14 Waterscape — 9,693 65,176 74,869 613 9,694 65,788 75,482 4,924 2014 Sep-14 SEATTLE, WA 57,525 103,975 443,344 547,319 35,758 108,280 474,797 583,077 181,530 Rosebeach — 8,414 17,449 25,863 3,450 8,760 20,553 29,313 12,675 1970 Sep-04 Tierra Del Rey 43,078 39,586 36,679 76,265 3,250 39,674 39,841 79,515 18,883 1999 Dec-07 The Westerly 67,700 48,182 102,364 150,546 37,220 50,722 137,044 187,766 46,474 2013 Sep-10 Jefferson at Marina del Rey — 55,651 — 55,651 90,660 61,455 84,856 146,311 32,288 2008 Sep-07 LOS ANGELES, CA 110,778 151,833 156,492 308,325 134,580 160,611 282,294 442,905 110,320 Boronda Manor — 1,946 8,982 10,928 9,534 3,195 17,267 20,462 9,244 1979 Dec-98 Garden Court — 888 4,188 5,076 5,435 1,559 8,952 10,511 4,981 1973 Dec-98 Cambridge Court — 3,039 12,883 15,922 14,767 5,302 25,387 30,689 13,958 1974 Dec-98 Laurel Tree — 1,304 5,115 6,419 6,080 2,188 10,311 12,499 5,627 1977 Dec-98 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired The Pointe At Harden Ranch — 6,388 23,854 30,242 27,357 10,021 47,578 57,599 24,926 1986 Dec-98 The Pointe At Northridge — 2,044 8,028 10,072 10,089 3,295 16,866 20,161 9,293 1979 Dec-98 The Pointe At Westlake — 1,329 5,334 6,663 6,364 2,181 10,846 13,027 5,700 1975 Dec-98 MONTEREY PENINSULA, CA — 16,938 68,384 85,322 79,626 27,741 137,207 164,948 73,729 Verano at Rancho Cucamonga Town Square 55,263 13,557 3,645 17,202 53,949 23,255 47,896 71,151 34,875 2006 Oct-02 Windemere at Sycamore Highland — 5,810 23,450 29,260 2,964 6,129 26,095 32,224 17,614 2001 Nov-02 Villas at Carlsbad — 6,517 10,718 17,235 2,876 6,780 13,331 20,111 7,826 1966 Oct-04 OTHER SOUTHERN CA 55,263 25,884 37,813 63,697 59,789 36,164 87,322 123,486 60,315 Tualatin Heights — 3,273 9,134 12,407 6,745 3,841 15,311 19,152 10,231 1989 Dec-98 Hunt Club — 6,014 14,870 20,884 6,866 6,395 21,355 27,750 14,364 1985 Sep-04 PORTLAND, OR — 9,287 24,004 33,291 13,611 10,236 36,666 46,902 24,595 TOTAL WEST REGION 466,881 804,897 1,504,019 2,308,916 1,019,059 883,471 2,444,504 3,327,975 1,037,095 MID-ATLANTIC REGION Dominion Middle Ridge 29,344 3,311 13,283 16,594 6,816 3,850 19,560 23,410 14,076 1990 Jun-96 Dominion Lake Ridge 20,047 2,366 8,387 10,753 7,490 2,866 15,377 18,243 10,431 1987 Feb-96 Presidential Greens — 11,238 18,790 30,028 9,883 11,680 28,231 39,911 19,977 1938 May-02 The Whitmore — 6,418 13,411 19,829 20,734 7,495 33,068 40,563 22,988 2008 Apr-02 Ridgewood — 5,612 20,086 25,698 8,522 6,014 28,206 34,220 20,340 1988 Aug-02 DelRay Tower — 297 12,786 13,083 113,357 9,461 116,979 126,440 9,914 2014 Jan-08 Waterside Towers — 1,139 49,657 50,796 18,261 36,233 32,824 69,057 20,975 1971 Dec-03 Wellington Place at Olde Town 32,037 13,753 36,059 49,812 17,416 14,740 52,488 67,228 35,000 2008 Sep-05 Andover House — 14,357 51,577 65,934 3,769 14,379 55,324 69,703 27,837 2004 Mar-07 Sullivan Place — 1,137 103,676 104,813 7,066 1,364 110,515 111,879 51,643 2007 Dec-07 Circle Towers 70,884 32,815 107,051 139,866 13,056 33,357 119,565 152,922 53,022 1972 Mar-08 Delancey at Shirlington — 21,606 66,765 88,371 2,195 21,632 68,934 90,566 30,609 2006/2007 Mar-08 View 14 — 5,710 97,941 103,651 2,888 5,721 100,818 106,539 25,845 2009 Jun-11 Signal Hill — 13,290 — 13,290 69,769 25,510 57,549 83,059 25,243 2010 Mar-07 Capitol View on 14th — 31,393 — 31,393 94,714 31,395 94,712 126,107 17,603 2013 Sep-07 Domain College Park 31,337 7,300 — 7,300 58,032 7,307 58,025 65,332 8,008 2014 Jun-11 1200 East West — 9,748 68,022 77,770 85 9,749 68,106 77,855 878 2010 Oct-15 Courts at Huntington Station — 27,749 111,878 139,627 78 27,749 111,956 139,705 1,682 2011 Oct-15 Eleven55 Ripley — 15,566 107,539 123,105 76 15,566 107,615 123,181 1,402 2014 Oct-15 Arbor Park of Alexandria 95,818 50,881 159,728 210,609 99 50,881 159,827 210,708 2,428 1969/2015 Oct-15 Courts at Dulles — 14,697 83,834 98,531 150 14,700 83,981 98,681 1,277 2000 Oct-15 Newport Village 127,600 55,283 177,454 232,737 475 55,285 177,927 233,212 2,704 1968 Oct-15 METROPOLITAN, D.C. 407,067 345,666 1,307,924 1,653,590 454,931 406,934 1,701,587 2,108,521 403,882 Dominion Kings Place 14,294 1,565 7,007 8,572 4,484 1,890 11,166 13,056 8,506 1983 Dec-92 Dominion At Eden Brook — 2,361 9,384 11,745 6,787 2,977 15,555 18,532 12,406 1984 Dec-92 Ellicott Grove — 2,920 9,099 12,019 23,363 5,379 30,003 35,382 23,332 2008 Jul-94 Dominion Constant Freindship 8,783 903 4,669 5,572 4,117 1,320 8,369 9,689 6,274 1990 May-95 Lakeside Mill 12,569 2,666 10,109 12,775 5,038 2,997 14,816 17,813 11,336 1989 Dec-99 Calvert’s Walk — 4,408 24,692 29,100 7,396 4,817 31,679 36,496 20,827 1988 Mar-04 Arborview Apartments — 4,653 23,952 28,605 8,090 5,249 31,446 36,695 21,388 1992 Mar-04 Liriope Apartments — 1,620 6,791 8,411 1,374 1,653 8,132 9,785 5,352 1997 Mar-04 20 Lambourne 30,132 11,750 45,590 57,340 6,406 12,106 51,640 63,746 24,313 2003 Mar-08 Domain Brewers Hill — 4,669 40,630 45,299 942 4,700 41,541 46,241 12,690 2009 Aug-10 BALTIMORE, MD 65,778 37,515 181,923 219,438 67,997 43,088 244,347 287,435 146,424 Gayton Pointe Townhomes — 826 5,148 5,974 29,738 3,463 32,249 35,712 27,255 2007 Sep-95 Waterside At Ironbridge — 1,844 13,239 15,083 7,614 2,328 20,369 22,697 13,860 1987 Sep-97 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired Carriage Homes at Wyndham — 474 30,997 31,471 7,959 3,901 35,529 39,430 24,260 1998 Nov-03 Legacy at Mayland 34,567 1,979 11,524 13,503 29,886 4,946 38,443 43,389 32,042 1969/2007 Dec-91 RICHMOND, VA 34,567 5,123 60,908 66,031 75,197 14,638 126,590 141,228 97,417 TOTAL MID-ATLANTIC REGION 507,412 388,304 1,550,755 1,939,059 598,125 464,660 2,072,524 2,537,184 647,723 SOUTHEAST REGION Seabrook — 1,846 4,155 6,001 8,427 2,763 11,665 14,428 9,531 2004 Feb-96 Altamira Place — 1,533 11,076 12,609 20,724 3,539 29,794 33,333 25,586 2007 Apr-94 Regatta Shore — 757 6,608 7,365 16,031 2,060 21,336 23,396 17,330 2007 Jun-94 Alafaya Woods 17,776 1,653 9,042 10,695 9,245 2,555 17,385 19,940 13,299 2006 Oct-94 Los Altos 21,592 2,804 12,349 15,153 10,994 4,058 22,089 26,147 15,263 2004 Oct-96 Lotus Landing — 2,185 8,639 10,824 10,108 2,873 18,059 20,932 11,987 2006 Jul-97 Seville On The Green — 1,282 6,498 7,780 7,249 1,738 13,291 15,029 9,051 2004 Oct-97 Ashton Waterford 23,015 3,872 17,538 21,410 4,563 4,273 21,700 25,973 13,830 2000 May-98 Arbors at Lee Vista — 6,692 12,860 19,552 12,894 7,264 25,182 32,446 19,618 2007 Aug-06 ORLANDO, FL 62,383 22,624 88,765 111,389 100,235 31,123 180,501 211,624 135,495 Legacy Hill — 1,148 5,867 7,015 8,807 1,764 14,058 15,822 11,246 1977 Nov-95 Hickory Run — 1,469 11,584 13,053 10,459 2,155 21,357 23,512 14,244 1989 Dec-95 Carrington Hills — 2,117 — 2,117 34,535 4,506 32,146 36,652 21,305 1999 Dec-95 Brookridge — 708 5,461 6,169 4,830 1,162 9,837 10,999 7,007 1986 Mar-96 Breckenridge — 766 7,714 8,480 4,646 1,285 11,841 13,126 8,155 1986 Mar-97 Colonnade 16,677 1,460 16,015 17,475 5,766 1,952 21,289 23,241 12,268 1998 Jan-99 The Preserve at Brentwood 21,804 3,182 24,674 27,856 7,431 3,641 31,646 35,287 21,056 1998 Jun-04 Polo Park — 4,583 16,293 20,876 16,508 5,741 31,643 37,384 22,411 2008 May-06 NASHVILLE, TN 38,481 15,433 87,608 103,041 92,982 22,206 173,817 196,023 117,692 Summit West — 2,176 4,710 6,886 9,314 3,552 12,648 16,200 11,005 1972 Dec-92 The Breyley — 1,780 2,458 4,238 17,606 3,457 18,387 21,844 16,978 2007 Sep-93 Lakewood Place 18,230 1,395 10,647 12,042 9,654 2,709 18,987 21,696 14,531 1986 Mar-94 Cambridge Woods 12,713 1,791 7,166 8,957 9,042 2,687 15,312 17,999 11,297 1985 Jun-97 Inlet Bay — 7,702 23,150 30,852 15,659 9,304 37,207 46,511 27,055 1988/1989 Jun-03 MacAlpine Place — 10,869 36,858 47,727 7,862 11,545 44,044 55,589 28,780 2001 Dec-04 The Vintage Lofts at West End — 6,611 37,663 44,274 16,107 15,119 45,262 60,381 22,082 2009 Jul-09 TAMPA, FL 30,943 32,324 122,652 154,976 85,244 48,373 191,847 240,220 131,728 The Reserve and Park at Riverbridge 39,179 15,968 56,401 72,369 9,823 16,602 65,590 82,192 40,676 1999/2001 Dec-04 OTHER FLORIDA 39,179 15,968 56,401 72,369 9,823 16,602 65,590 82,192 40,676 TOTAL SOUTHEAST REGION 170,986 86,349 355,426 441,775 288,284 118,304 611,755 730,059 425,591 NORTHEAST REGION 10 Hanover Square — 41,432 218,983 260,415 9,730 41,496 228,649 270,145 54,457 2005 Apr-11 21 Chelsea — 36,399 107,154 143,553 12,592 36,414 119,731 156,145 28,031 2001 Aug-11 View 34 — 114,410 324,920 439,330 96,772 115,026 421,076 536,102 99,652 1985/2013 Jul-11 95 Wall Street — 57,637 266,255 323,892 7,110 57,810 273,192 331,002 71,769 2008 Aug-11 NEW YORK, NY — 249,878 917,312 1,167,190 126,204 250,746 1,042,648 1,293,394 253,909 Garrison Square — 5,591 91,027 96,618 7,226 5,635 98,209 103,844 29,629 1887/1990 Sep-10 Ridge at Blue Hills 22,147 6,039 34,869 40,908 1,479 6,113 36,274 42,387 11,196 2007 Sep-10 Inwood West 54,919 20,778 88,096 108,874 5,121 19,324 94,671 113,995 26,028 2006 Apr-11 14 North — 10,961 51,175 62,136 6,359 11,077 57,418 68,495 16,632 2005 Apr-11 100 Pier 4 — 24,584 — 24,584 190,695 24,584 190,695 215,279 7,259 2015 Dec-15 BOSTON, MA 77,066 67,953 265,167 333,120 210,880 66,733 477,267 544,000 90,744 TOTAL NORTHEAST REGION 77,066 317,831 1,182,479 1,500,310 337,084 317,479 1,519,915 1,837,394 344,653 SOUTHWEST REGION THIRTY377 29,361 24,036 32,951 56,987 9,332 24,382 41,937 66,319 24,256 2007 Aug-06 Legacy Village 82,734 16,882 100,102 116,984 8,827 17,407 108,404 125,811 50,919 6/7/2005 Mar-08 Garden Oaks — 2,132 5,367 7,499 1,812 6,947 2,364 9,311 1,996 1979 Mar-07 Glenwood — 7,903 554 8,457 2,105 8,159 2,403 10,562 1,583 1970 May-07 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Buildings and Improvements Total Initial Acquisition Costs Costs of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction(a) Date Acquired Talisker of Addison — 10,440 634 11,074 2,259 10,845 2,488 13,333 2,026 1975 May-07 Springhaven — 6,688 3,354 10,042 1,543 8,359 3,226 11,585 2,465 1977 Apr-07 Clipper Pointe — 13,221 2,507 15,728 2,615 15,001 3,342 18,343 2,897 1978 May-07 Highlands of Preston — 2,151 8,168 10,319 31,543 6,044 35,818 41,862 26,252 2008 Mar-98 DALLAS, TX 112,095 83,453 153,637 237,090 60,036 97,144 199,982 297,126 112,394 Barton Creek Landing — 3,151 14,269 17,420 22,588 4,913 35,095 40,008 22,924 2010 Mar-02 Residences at the Domain 36,299 4,034 55,256 59,290 3,668 4,281 58,677 62,958 25,547 2007 Aug-08 Red Stone Ranch — 5,084 17,646 22,730 2,111 5,272 19,569 24,841 5,243 2000 Apr-12 Lakeline Villas — 4,148 16,869 21,017 1,495 4,296 18,216 22,512 4,744 2004 Apr-12 AUSTIN, TX 36,299 16,417 104,040 120,457 29,862 18,762 131,557 150,319 58,458 TOTAL SOUTHWEST REGION 148,394 99,870 257,677 357,547 89,898 115,906 331,539 447,445 170,852 TOTAL OPERATING COMMUNITIES 1,370,739 1,697,251 4,850,356 6,547,607 2,332,450 1,899,820 6,980,237 8,880,057 2,625,914 REAL ESTATE UNDER DEVELOPMENT Pacific City — 78,085 — 78,085 45,987 78,085 45,987 124,072 — TOTAL REAL ESTATE UNDER DEVELOPMENT — 78,085 — 78,085 45,987 78,085 45,987 124,072 — LAND Waterside — 11,862 — 11,862 283 12,084 61 12,145 284 345 Harrison Street — 32,938 — 32,938 7,437 32,943 7,432 40,375 — 7 Harcourt — 884 — 884 5,045 804 5,125 5,929 — 2919 Wilshire — 6,773 — 6,773 1,563 6,773 1,563 8,336 553 Vitruvian Park ® — 4,325 — 4,325 9,510 11,319 2,516 13,835 2,098 TOTAL LAND — 56,782 — 56,782 23,838 63,923 16,697 80,620 2,935 HELD FOR DISPOSITION 3032 Wilshire — 9,963 — 9,963 2,643 9,963 2,643 12,606 830 TOTAL HELD FOR DISPOSITION — 9,963 — 9,963 2,643 9,963 2,643 12,606 830 COMMERCIAL Hanover Village — 1,624 — 1,624 — 1,104 520 1,624 553 Circle Towers Office Bldg — 1,407 — 1,407 6,021 1,380 6,048 7,428 2,683 Brookhaven Shopping Center — 4,943 — 4,943 16,785 7,793 13,935 21,728 12,496 Bellevue Plaza retail — 24,377 — 24,377 8,103 29,920 2,560 32,480 772 TOTAL COMMERCIAL — 32,351 — 32,351 30,909 40,197 23,063 63,260 16,504 Other (b) — — — — 5,356 — 5,356 5,356 62 1745 Shea Center I 11,755 3,034 20,534 23,568 737 3,034 21,271 24,305 629 TOTAL CORPORATE 11,755 3,034 20,534 23,568 6,093 3,034 26,627 29,661 691 TOTAL COMMERCIAL & CORPORATE 11,755 35,385 20,534 55,919 37,002 43,231 49,690 92,921 17,195 Deferred Financing Costs $ (5,549 ) TOTAL REAL ESTATE OWNED $ 1,376,945 $ 1,877,466 $ 4,870,890 $ 6,748,356 $ 2,441,920 $ 2,095,022 $ 7,095,254 $ 9,190,276 $ 2,646,874 (a) Date of construction or date of last major renovation. (b) Includes unallocated accruals and capital expenditures. The aggregate cost for federal income tax purposes was approximately $8.3 billion at December 31, 2015. The estimated depreciable lives for all buildings in the latest Consolidated Statements of Operations are 35 to 55 years . 3-YEAR ROLLFORWARD OF REAL ESTATE OWNED AND ACCUMULATED DEPRECIATION The following is a reconciliation of the carrying amount of total real estate owned at December 31, ( in thousands) : 2015 2014 2013 Balance at beginning of the year $ 8,383,259 $ 8,207,977 $ 8,055,828 Real estate acquired 906,446 231,225 — Capital expenditures and development 203,183 326,461 452,057 Real estate sold (301,920 ) (269,681 ) (70,687 ) Real estate contributed to joint ventures — (112,344 ) (356,303 ) Consolidation of joint venture assets — — 129,437 Impairment of assets, including casualty-related impairments (692 ) (379 ) (2,355 ) Balance at end of the year $ 9,190,276 $ 8,383,259 $ 8,207,977 The following is a reconciliation of total accumulated depreciation for real estate owned at December 31, ( in thousands ): 2015 2014 2013 Balance at beginning of the year $ 2,434,772 $ 2,208,794 $ 1,924,682 Depreciation expense for the year 364,622 356,673 339,326 Accumulated depreciation on sales (152,520 ) (126,151 ) (34,794 ) Accumulated depreciation on real estate contributed to joint ventures — (4,228 ) (20,662 ) Accumulated depreciation on assets of consolidated joint ventures — — 1,374 Accumulated depreciation on retirements of fully depreciated assets — — (1,132 ) Write off of accumulated depreciation on casualty-related impaired assets — (316 ) — Balance at end of year $ 2,646,874 $ 2,434,772 $ 2,208,794
United Dominion Reality L.P.
Real Estate and Accumulated Depreciation [Line Items]
Schedule III - Real Estate Owned	Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Building and Improvements Total Initial Acquisition Costs Cost of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction (a) Date Acquired WEST REGION Harbor at Mesa Verde $ 61,050 $ 20,476 $ 28,538 $ 49,014 $ 14,641 $ 21,314 $ 42,341 $ 63,655 $ 27,697 2003 Jun-03 27 Seventy Five Mesa Verde 36,423 99,329 110,644 209,973 92,673 112,650 189,996 302,646 87,007 1972/2013 Oct-04 Pacific Shores 42,552 7,345 22,624 29,969 9,913 7,913 31,969 39,882 20,771 2003 Jun-03 Huntington Vista 36,980 8,055 22,486 30,541 11,612 8,713 33,440 42,153 19,810 1970 Jun-03 Missions at Back Bay — 229 14,129 14,358 2,526 10,874 6,010 16,884 4,229 1969 Dec-03 Coronado at Newport — North — 62,516 46,082 108,598 29,014 66,770 70,842 137,612 44,814 2000 Oct-04 Vista Del Rey — 10,670 7,080 17,750 2,502 10,988 9,264 20,252 6,117 1969 Sep-04 Coronado South — 58,785 50,067 108,852 19,393 59,278 68,967 128,245 43,476 2000 Mar-05 ORANGE COUNTY, CA 177,005 267,405 301,650 569,055 182,274 298,500 452,829 751,329 253,921 2000 Post Street — 9,861 44,578 54,439 30,040 10,249 61,701 71,950 25,684 1987/2006 Dec-98 Birch Creek — 4,365 16,696 21,061 7,536 5,139 23,458 28,597 13,756 1968 Dec-98 Highlands Of Marin — 5,996 24,868 30,864 26,063 7,257 49,670 56,927 29,237 2010 Dec-98 Marina Playa — 6,224 23,916 30,140 10,032 6,938 33,234 40,172 19,547 1971 Dec-98 River Terrace 39,310 22,161 40,137 62,298 4,307 22,428 44,177 66,605 25,943 2005 Aug-05 CitySouth — 14,031 30,537 44,568 35,627 16,290 63,905 80,195 36,437 2012 Nov-05 Bay Terrace — 8,545 14,458 23,003 5,046 11,458 16,591 28,049 9,622 1962 Oct-05 Highlands of Marin Phase II — 5,353 18,559 23,912 11,088 5,758 29,242 35,000 15,221 2010 Oct-07 Edgewater — 30,657 83,872 114,529 3,689 30,690 87,528 118,218 39,217 2007 Mar-08 Almaden Lake Village 27,000 594 42,515 43,109 6,031 773 48,367 49,140 21,469 1999 Jul-08 SAN FRANCISCO, CA 66,310 107,787 340,136 447,923 139,459 116,980 457,873 574,853 236,133 Rosebeach — 8,414 17,449 25,863 3,450 8,760 20,553 29,313 12,675 1970 Sep-04 Tierra Del Rey 43,078 39,586 36,679 76,265 3,250 39,674 39,841 79,515 18,883 1999 Dec-07 LOS ANGELES, CA 43,078 48,000 54,128 102,128 6,700 48,434 60,394 108,828 31,558 Crowne Pointe — 2,486 6,437 8,923 5,666 2,868 11,721 14,589 7,585 1987 Dec-98 Hilltop — 2,174 7,408 9,582 4,328 2,724 11,186 13,910 6,895 1985 Dec-98 The Kennedy — 6,179 22,307 28,486 1,931 6,272 24,145 30,417 13,947 2005 Nov-05 Hearthstone at Merrill Creek 22,591 6,848 30,922 37,770 3,829 6,975 34,624 41,599 15,574 2000 May-08 Island Square — 21,284 89,389 110,673 4,695 21,428 93,940 115,368 40,021 2007 Jul-08 SEATTLE, WA 22,591 38,971 156,463 195,434 20,449 40,267 175,616 215,883 84,022 Boronda Manor — 1,946 8,982 10,928 9,534 3,195 17,267 20,462 9,244 1979 Dec-98 Garden Court — 888 4,188 5,076 5,435 1,559 8,952 10,511 4,981 1973 Dec-98 Cambridge Court — 3,039 12,883 15,922 14,767 5,302 25,387 30,689 13,958 1974 Dec-98 Laurel Tree — 1,304 5,115 6,419 6,080 2,188 10,311 12,499 5,627 1977 Dec-98 The Pointe At Harden Ranch — 6,388 23,854 30,242 27,357 10,021 47,578 57,599 24,926 1986 Dec-98 The Pointe At Northridge — 2,044 8,028 10,072 10,089 3,295 16,866 20,161 9,293 1979 Dec-98 The Pointe At Westlake — 1,329 5,334 6,663 6,364 2,181 10,846 13,027 5,700 1975 Dec-98 MONTEREY PENINSULA, CA — 16,938 68,384 85,322 79,626 27,741 137,207 164,948 73,729 Verano at Rancho Cucamonga Town Square 55,262 13,557 3,645 17,202 53,949 23,255 47,896 71,151 34,875 2006 Oct-02 Villas at Carlsbad — 6,517 10,718 17,235 2,876 6,780 13,331 20,111 7,826 1966 Oct-04 OTHER SOUTHERN CA 55,262 20,074 14,363 34,437 56,825 30,035 61,227 91,262 42,701 Tualatin Heights — 3,273 9,134 12,407 6,745 3,841 15,311 19,152 10,231 1989 Dec-98 Hunt Club — 6,014 14,870 20,884 6,866 6,395 21,355 27,750 14,364 1985 Sep-04 PORTLAND, OR — 9,287 24,004 33,291 13,611 10,236 36,666 46,902 24,595 TOTAL WEST REGION 364,246 508,462 959,128 1,467,590 498,944 572,193 1,381,812 1,954,005 746,659 MID-ATLANTIC REGION Ridgewood — 5,612 20,086 25,698 8,522 6,014 28,206 34,220 20,340 1988 Aug-02 DelRey Tower — 297 12,786 13,083 113,357 9,461 116,979 126,440 9,914 2014 Jan-08 Initial Costs Gross Amount at Which Carried at Close of Period Encumbrances Land and Land Improvements Building and Improvements Total Initial Acquisition Costs Cost of Improvements Capitalized Subsequent to Acquisition Costs Land and Land Improvements Buildings & Buildings Improvements Total Carrying Value Accumulated Depreciation Date of Construction (a) Date Acquired Wellington Place at Olde Town 32,037 13,753 36,059 49,812 17,416 14,740 52,488 67,228 35,000 2008 Sep-05 Andover House — 14,357 51,577 65,934 3,769 14,379 55,324 69,703 27,837 2004 Mar-07 Sullivan Place — 1,137 103,676 104,813 7,066 1,364 110,450 111,814 51,578 2007 Dec-07 Courts at Huntington Station — 27,749 111,878 139,627 78 27,749 111,956 139,705 1,682 2011 Oct-15 METROPOLITAN D.C. 32,037 62,905 336,062 398,967 150,208 73,707 475,403 549,110 146,351 Lakeside Mill 12,569 2,666 10,109 12,775 5,038 2,997 14,816 17,813 11,336 1989 Dec-99 Calvert’s Walk — 4,408 24,692 29,100 7,396 4,817 31,679 36,496 20,827 1988 Mar-04 Liriope Apartments — 1,620 6,791 8,411 1,374 1,653 8,132 9,785 5,352 1997 Mar-04 20 Lambourne 30,132 11,750 45,590 57,340 6,406 12,106 51,640 63,746 24,313 2003 Mar-08 BALTIMORE, MD 42,701 20,444 87,182 107,626 20,214 21,573 106,267 127,840 61,828 TOTAL MID-ATLANTIC REGION 74,738 83,349 423,244 506,593 170,422 95,280 581,670 676,950 208,179 SOUTHEAST REGION Inlet Bay — 7,702 23,150 30,852 15,659 9,304 37,207 46,511 27,055 1988/1989 Jun-03 MacAlpine Place — 10,869 36,858 47,727 7,862 11,545 44,044 55,589 28,780 2001 Dec-04 TAMPA, FL — 18,571 60,008 78,579 23,521 20,849 81,251 102,100 55,835 Legacy Hill — 1,148 5,867 7,015 8,807 1,764 14,058 15,822 11,246 1977 Nov-95 Hickory Run — 1,469 11,584 13,053 10,459 2,155 21,357 23,512 14,244 1989 Dec-95 Carrington Hills — 2,117 — 2,117 34,535 4,506 32,146 36,652 21,305 1999 Dec-95 Brookridge — 708 5,461 6,169 4,830 1,162 9,837 10,999 7,007 1986 Mar-96 Breckenridge — 766 7,714 8,480 4,646 1,285 11,841 13,126 8,155 1986 Mar-97 Polo Park — 4,583 16,293 20,876 16,508 5,741 31,643 37,384 22,411 2008 May-06 NASHVILLE, TN — 10,791 46,919 57,710 79,785 16,613 120,882 137,495 84,368 The Reserve and Park at Riverbridge 39,179 15,968 56,401 72,369 9,823 16,602 65,590 82,192 40,676 1999/2001 Dec-04 OTHER FLORIDA 39,179 15,968 56,401 72,369 9,823 16,602 65,590 82,192 40,676 TOTAL SOUTHEAST REGION 39,179 45,330 163,328 208,658 113,129 54,064 267,723 321,787 180,879 NORTHEAST REGION 14 North — 10,961 51,175 62,136 6,359 11,077 57,418 68,495 16,632 2005 Apr-11 BOSTON, MA — 10,961 51,175 62,136 6,359 11,077 57,418 68,495 16,632 10 Hanover Square — 41,432 218,983 260,415 9,730 41,496 228,649 270,145 54,457 2005 Apr-11 95 Wall Street — 57,637 266,255 323,892 7,110 57,810 273,192 331,002 71,769 2008 Aug-11 NEW YORK, NY — 99,069 485,238 584,307 16,840 99,306 501,841 601,147 126,226 TOTAL NORTHEAST REGION — 110,030 536,413 646,443 23,199 110,383 559,259 669,642 142,858 TOTAL OPERATING COMMUNITIES 478,163 747,171 2,082,113 2,829,284 805,694 831,920 2,790,464 3,622,384 1,278,575 COMMERCIAL Circle Towers Office Bldg — 1,407 — 1,407 6,021 1,380 6,048 7,428 2,683 TOTAL COMMERCIAL — 1,407 — 1,407 6,021 1,380 6,048 7,428 2,683 Other (b) — — — — 1,093 — 1,093 1,093 — TOTAL CORPORATE — — — — 1,093 — 1,093 1,093 — TOTAL COMMERCIAL & CORPORATE — 1,407 — 1,407 7,114 1,380 7,141 8,521 2,683 Deferred Financing Costs $ (2,199 ) TOTAL REAL ESTATE OWNED $ 475,964 $ 748,578 $ 2,082,113 $ 2,830,691 $ 812,808 $ 833,300 $ 2,797,605 $ 3,630,905 $ 1,281,258 (a) Date of construction or date of last major renovation. (b) Includes unallocated accruals and capital expenditures. The aggregate cost for federal income tax purpose was approximately $3.0 billion at December 31, 2015. The estimated depreciable lives for all buildings in the latest Consolidated Statements of Operations are 35 to 55 years . 3-YEAR ROLLFORWARD OF REAL ESTATE OWNED AND ACCUMULATED DEPRECIATION The following is a reconciliation of the carrying amount of total real estate owned at December 31, ( in thousands ): 2015 2014 2013 Balance at beginning of the year $ 4,238,770 $ 4,188,480 $ 4,182,920 Real estate acquired 139,627 — — Capital expenditures and development 61,196 91,682 151,002 Real estate sold (180,069 ) (41,013 ) (70,687 ) Real estate transferred to the General Partner — — (74,755 ) Real estate deconsolidated (628,479 ) — — Casualty-related impairment of assets (140 ) (379 ) — Balance at end of year $ 3,630,905 $ 4,238,770 $ 4,188,480 The following is a reconciliation of total accumulated depreciation for real estate owned at December 31, ( in thousands ): 2015 2014 2013 Balance at beginning of the year $ 1,403,303 $ 1,241,574 $ 1,097,133 Depreciation expense for the year 168,495 178,719 179,404 Accumulated depreciation on sales (67,177 ) (16,674 ) (34,794 ) Accumulated depreciation on property transferred to the General Partner — — (169 ) Accumulated depreciation on property deconsolidated (223,363 ) — — Write off of accumulated depreciation on casualty-related impaired assets — (316 ) — Balance at end of year $ 1,281,258 $ 1,403,303 $ 1,241,574

Significant Accounting Polici49

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , which incorporates a requirement that a disposition represent a strategic shift in an entity’s operations into the definition of a discontinued operation. In accordance with the ASU, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity. The standard requires prospective application and will be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. The early adoption provision excludes components of an entity that were sold or classified as held for sale prior to the adoption of the standard. The Company elected to early adopt this standard effective January 1, 2014, which had a significant impact on the Company’s consolidated financial statements as further discussed in Note 3, Discontinued Operations . Subsequent to the Company’s adoption of ASU 2014-08, the sale of real estate that does not meet the definition of a discontinued operation under the standard is included in Gain/(loss) on sale of real estate owned, net of tax on the Consolidated Statements of Operations. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method, and the standard will be effective for the Company on January 1, 2017; early adoption is not permitted. The Company has not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which makes changes to both the variable interest model and the voting model of consolidation. Under ASU 2015-02, companies will need to re-evaluate whether an entity meets the criteria to be considered a variable interest entity (“VIE”) or whether the consolidation of an entity should be assessed under the voting model. The new standard specifically eliminates the presumption in the current voting model that a general partner controls a limited partnership or similar entity unless that presumption can be overcome. The new standard will be effective for the Company beginning on January 1, 2016 and must be applied using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the period of adoption or retrospectively to each period presented. The Company does not expect the adoption of the new standard to result in the consolidation of entities not previously consolidated or the deconsolidation of any entities previously consolidated. Upon adopting the new standard, the Company expects that the Operating Partnership and DownREIT Partnership will become VIEs as the limited partners of both entities lack substantive kick-out rights and substantive participating rights. The Company expects to be the primary beneficiary of, and continue to consolidate, both entities. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. ASU 2015-03 did not directly address presentation or subsequent measurement of issuance costs related to line-of-credit arrangements. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , which clarifies that such costs may be presented as an asset and subsequently amortized over the term of the line-of-credit arrangement. The cumulative guidance, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. The Company elected to early adopt ASU 2015-03 and ASU 2015-15 during the fourth quarter of 2015. As a result, for all periods presented, deferred financing costs related to secured and unsecured debt are included as reductions to Secured debt, net and Unsecured debt, net , respectively, on the accompanying Consolidated Balance Sheets and deferred financing costs related to revolving credit facilities are included within Other assets on the accompanying Consolidated Balance Sheets. At December 31, 2015, $7.9 million , $5.5 million and $12.4 million of deferred financing costs were included within Other assets , Secured debt, net , and Unsecured debt, net , respectively. At December 31, 2014, the following amounts of deferred financing costs were reclassified ( in thousands ): Deferred financing costs Other assets Secured debt, net Unsecured Debt, net December 31, 2014 As previously presented $ 22,686 $ 105,202 $ 1,361,529 $ 2,221,576 Reclassification of deferred financing costs (22,686 ) 4,880 (7,208 ) (10,598 ) As presented herein $ — $ 110,082 $ 1,354,321 $ 2,210,978
Real estate	Real Estate Real estate assets held for investment are carried at historical cost and consist of land, buildings and improvements, furniture, fixtures and equipment and other costs incurred during their development, acquisition and redevelopment. Expenditures for ordinary repair and maintenance costs are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to the acquisition and/or improvement of real estate assets are capitalized and depreciated over their estimated useful lives if the expenditures qualify as a betterment or the life of the related asset will be substantially extended beyond the original life expectancy. UDR purchases real estate investment properties and records the tangible and identifiable intangible assets and liabilities acquired based on their estimated fair value. The primary, although not only, identifiable intangible asset associated with our portfolio is the value of existing lease agreements. When recording the acquisition of a community, we first assign fair value to the estimated intangible value of the existing lease agreements and then to the estimated value of the land, building and fixtures assuming the community is vacant. The Company estimates the intangible value of the lease agreements by determining the lost revenue associated with a hypothetical lease-up. Depreciation on the building is based on the expected useful life of the asset and the in-place leases are amortized over their remaining average contractual life. Property acquisition costs are expensed as incurred. Quarterly or when changes in circumstances warrant, UDR will assess our real estate properties for indicators of impairment. In determining whether the Company has indicators of impairment in our real estate assets, we assess whether the long-lived asset’s carrying value exceeds the community’s undiscounted future cash flows, which is representative of projected net operating income (“NOI”) plus the residual value of the community. Our future cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. If such indicators of impairment are present and the carrying value exceeds the undiscounted cash flows of the community, an impairment loss is recognized equal to the excess of the carrying amount of the asset over its estimated fair value. Our estimates of fair market value represent our best estimate based primarily upon unobservable inputs related to rental rates, operating costs, growth rates, discount rates, capitalization rates, industry trends and reference to market rates and transactions. For long-lived assets to be disposed of, impairment losses are recognized when the fair value of the asset less estimated cost to sell is less than the carrying value of the asset. Properties classified as real estate held for sale generally represent properties that are actively marketed or contracted for sale with the closing expected to occur within the next twelve months. Real estate held for sale is carried at the lower of cost, net of accumulated depreciation, or fair value, less the cost to sell, determined on an asset-by-asset basis. Expenditures for ordinary repair and maintenance costs on held for sale properties are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to held for sale properties are capitalized at cost. Depreciation is not recorded on real estate held for sale. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets which are 35 to 55 years for buildings, 10 to 35 years for major improvements, and 3 to 10 years for furniture, fixtures, equipment, and other assets. Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation . The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, for the years ended December 31, 2015 , 2014 , and 2013 were $6.3 million , $9.0 million and $11.1 million , respectively. During the years ended December 31, 2015 , 2014 , and 2013 , total interest capitalized was $16.1 million , $20.2 million , and $29.4 million , respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life.
Cash and cash equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, demand deposits with financial institutions and short-term, highly liquid investments. We consider all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The majority of the Company’s cash and cash equivalents are held at major commercial banks.
Restricted cash	Restricted Cash Restricted cash consists of escrow deposits held by lenders for real estate taxes, insurance and replacement reserves, and security deposits.
Revenue and real estate sales gain recognition	Revenue and Real Estate Sales Gain Recognition Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable. For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value. Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.
Notes Receivable	Notes Receivable The following table summarizes our notes receivable, net as of December 31, 2015 and 2014 ( dollars in thousands ): Interest rate at Balance Outstanding December 31, December 31, December 31, Note due February 2017 (a) 10.00 % $ 12,994 $ 11,869 Note due July 2017 (b) 8.00 % 2,500 2,500 Note due October 2020 (c) 8.00 % 1,200 — Total notes receivable, net $ 16,694 $ 14,369 (a) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $13.0 million , which bears an interest rate of 10.00% per annum. During the year ended December 31, 2015, the Company loaned an additional $1.1 million . Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (February 2017). (b) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.5 million , which bears an interest rate of 8.00% per annum. Interest payments are due monthly. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $5.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (July 2017). (c) In October 2015, the Company entered into a secured note receivable with an unaffiliated third party with an aggregate commitment of $2.0 million , which bears an interest rate of 8.00% per annum. During the year ended December 31, 2015 , the Company loaned $1.2 million under the note. Interest payments are due when the loan matures. The note matures at the earliest of the following: (a) the closing of any private or public capital raising in the amount of $10.0 million or greater; (b) an acquisition; (c) acceleration in the event of default; or (d) the fifth anniversary of the date of the note (October 2020). During the years ended December 31, 2015 , 2014 , and 2013 , the Company recognized $1.5 million , $3.4 million and $4.1 million , respectively, of interest income from notes receivable, of which $0.0 , $0.0 and $0.8 million , respectively, was related party interest income. Interest income is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations.
Investment in joint ventures	Investment in Joint Ventures and Partnerships We use the equity method to account for investments in joint ventures and partnerships that qualify as variable interest entities where we are not the primary beneficiary and other entities that we do not control or where we do not own a majority of the economic interest but have the ability to exercise significant influence over the operating and financial policies of the investee. Throughout these financial statements we use the term “joint venture” or “partnership” when referring to investments in entities in which we do not have a 100% ownership interest. The Company also uses the equity method when we function as the managing partner and our venture partner has substantive participating rights or where we can be replaced by our venture partner as managing partner without cause. For a joint venture or partnership accounted for under the equity method, our share of net earnings or losses is reflected as income/loss when earned/incurred and distributions are credited against our investment in the joint venture or partnership as received. In determining whether a joint venture or partnership is a variable interest entity, the Company considers: the form of our ownership interest and legal structure; the size of our investment; the financing structure of the entity, including necessity of subordinated debt; estimates of future cash flows; ours and our partner’s ability to participate in the decision making related to acquisitions, disposition, budgeting and financing of the entity; obligation to absorb losses and preferential returns; nature of our partner’s primary operations; and the degree, if any, of disproportionality between the economic and voting interests of the entity. As of December 31, 2015 , the Company did not determine any of our joint ventures or partnerships to be variable interest entities. We evaluate our investments in unconsolidated joint ventures for events or changes in circumstances that indicate there may be an other-than-temporary decline in value. We consider various factors to determine if a decrease in the value of the investment is other-than-temporary. These factors include, but are not limited to, age of the venture, our intent and ability to retain our investment in the entity, the financial condition and long-term prospects of the entity, the fair value of the property of the joint venture, and the relationships with the other joint venture partners and its lenders. The amount of loss recognized is the excess of the investment’s carrying amount over its estimated fair value. If we believe that the decline in fair value is temporary, no impairment is recorded. The aforementioned factors are taken into consideration as a whole by management in determining the valuation of our equity method investments. Should the actual results differ from management’s judgment, the valuation could be negatively affected and may result in a negative impact to our Consolidated Financial Statements.
Derivative financial instruments	Derivative Financial Instruments The Company utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. Derivative financial instruments are recorded on our Consolidated Balance Sheets as either an asset or liability and measured quarterly at their fair value. The changes in fair value for cash flow hedges that are deemed effective are reflected in other comprehensive income/(loss) and for non-designated derivative financial instruments in earnings. The ineffective component of cash flow hedges, if any, is recorded in earnings.
Redeemable noncontrolling interests in the Operating Partnership	Redeemable Noncontrolling Interests in the Operating Partnership and DownREIT Partnership Interests in the Operating Partnership and the DownREIT Partnership held by limited partners are represented by OP Units and DownREIT Units, respectively. The income is allocated to holders of OP Units/DownREIT Units based upon net income available to common stockholders and the weighted average number of OP Units/DownREIT Units outstanding to total common shares plus OP Units/DownREIT Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the partnership agreements of the Operating Partnership and the DownREIT Partnership. Limited partners of the Operating Partnership and the DownREIT Partnership have the right to require such partnership to redeem all or a portion of the OP Units/DownREIT Units held by the limited partner at a redemption price equal to and in the form of the Cash Amount (as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable), provided that such OP Units/DownREIT Units have been outstanding for at least one year. UDR, as the general partner of the Operating Partnership and the DownREIT Partnership may, in its sole discretion, purchase the OP Units/DownREIT Units by paying to the limited partner either the Cash Amount or the REIT Share Amount (generally one share of Common Stock of the Company for each OP Unit/DownREIT Unit), as defined in the partnership agreement of the Operating Partnership or the DownREIT Partnership, as applicable. Accordingly, the Company records the OP Units outside of permanent equity and reports the OP Units at their redemption value using the Company’s stock price at each balance sheet date.
Income Taxes	Income Taxes Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”). Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of December 31, 2015 and 2014 , UDR’s net deferred tax asset of $11.8 million , net of valuation allowance of $0.1 million , and $7.0 million , which had no valuation allowance, respectively, was included in Other assets on the Consolidated Balance Sheets. GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition. The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely tha n not (greater than 50 percent probability) to b e sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement. UDR had no material unrecognized tax benefit, accrued interest or penalties at December 31, 2015 . UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2011 through 2014 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in income tax expense.
Discontinued operations	Discontinued Operations Prior to the adoption of ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , the results of operations for those properties sold during the year or classified as held for sale at the end of the current year were classified as discontinued operations in the current and prior periods. Further, to meet the discontinued operations criteria, the Company will not have any significant continuing involvement in the ownership or operation of the property after the sale or disposition. Once a property is classified as held for sale, depreciation is no longer recorded. However, if the Company determines that the property no longer meets the criteria for held for sale, the Company will recapture any unrecorded depreciation on the property. The assets and liabilities, if any, of properties classified as held for sale are presented separately on the Consolidated Balance Sheets at the lower of their carrying amount or their estimated fair value less the costs to sell the assets. (See Note 3, Discontinued Operations and Assets Held for Sale, for further discussion).
Stock-based employee compensation plans	Stock-Based Employee Compensation Plans The Company measures the cost of employee services received in exchange for an award of an equity instrument based on the award’s fair value on the grant date and recognizes the cost over the period during which the employee is required to provide service in exchange for the award, which is generally the vesting period. The fair value for stock options issued by the Company is calculated utilizing the Black-Scholes-Merton formula. For performance based awards, the Company remeasures the fair value each balance sheet date with adjustments made on a cumulative basis until the award is settled and the final compensation is known.
Advertising costs	Advertising Costs All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item
Cost of raising capital	Cost of Raising Capital Costs incurred in connection with the issuance of equity securities are deducted from stockholders’ equity. Costs incurred in connection with the issuance or renewal of debt are recorded based on the terms of the debt issuance or renewal. Accordingly, if the terms of the renewed or modified debt instrument are deemed to be substantially different (i.e. a 10 percent or greater difference in the cash flows between instruments), all unamortized financing costs associated with the extinguished debt are charged to earnings in the current period and certain costs of new debt issuances are capitalized and amortized over the term of the debt. When the cash flows are not substantially different, the lender costs associated with the renewal or modification are capitalized and amortized into interest expense over the remaining term of the related debt instrument and other related costs are expensed. The balance of any unamortized financing costs associated with retired debt is expensed upon retirement. Deferred financing costs for new debt instruments include fees and costs incurred by the Company to obtain financing. Deferred financing costs are generally amortized on a straight-line basis, which approximates the effective interest method, over a period not to exceed the term of the related debt.
Comprehensive income	Comprehensive Income/(Loss) Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the years ended December 31, 2015 , 2014 , and 2013 , the Company's other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments and marketable securities reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to redeemable noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in interest expense in the accompanying Consolidated Statements of Operations. See Note 13, Derivatives and Hedging Activity, for further discussion. The (gain)/loss on marketable securities reclassified from other comprehensive income/(loss) is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the years ended December 31, 2015 , 2014 , and 2013 was $(0.3) million , $(0.1) million , and $0.3 million , respectively.
Use of estimates	Use of Estimates The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates.
Market concentration risk	Market Concentration Risk The Company is subject to increased exposure from economic and other competitive factors specific to markets where the Company holds a significant percentage of the carrying value of its real estate portfolio. At December 31, 2015 , the Company held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; Metropolitan D.C.; and New York, New York markets.

Significant Accounting Polici50

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Policies)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In April 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , which incorporates a requirement that a disposition represent a strategic shift in an entity’s operations into the definition of a discontinued operation. In accordance with the ASU, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity. The standard requires prospective application and will be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. The early adoption provision excludes components of an entity that were sold or classified as held for sale prior to the adoption of the standard. The Company elected to early adopt this standard effective January 1, 2014, which had a significant impact on the Company’s consolidated financial statements as further discussed in Note 3, Discontinued Operations . Subsequent to the Company’s adoption of ASU 2014-08, the sale of real estate that does not meet the definition of a discontinued operation under the standard is included in Gain/(loss) on sale of real estate owned, net of tax on the Consolidated Statements of Operations. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method, and the standard will be effective for the Company on January 1, 2017; early adoption is not permitted. The Company has not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which makes changes to both the variable interest model and the voting model of consolidation. Under ASU 2015-02, companies will need to re-evaluate whether an entity meets the criteria to be considered a variable interest entity (“VIE”) or whether the consolidation of an entity should be assessed under the voting model. The new standard specifically eliminates the presumption in the current voting model that a general partner controls a limited partnership or similar entity unless that presumption can be overcome. The new standard will be effective for the Company beginning on January 1, 2016 and must be applied using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the period of adoption or retrospectively to each period presented. The Company does not expect the adoption of the new standard to result in the consolidation of entities not previously consolidated or the deconsolidation of any entities previously consolidated. Upon adopting the new standard, the Company expects that the Operating Partnership and DownREIT Partnership will become VIEs as the limited partners of both entities lack substantive kick-out rights and substantive participating rights. The Company expects to be the primary beneficiary of, and continue to consolidate, both entities. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. ASU 2015-03 did not directly address presentation or subsequent measurement of issuance costs related to line-of-credit arrangements. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , which clarifies that such costs may be presented as an asset and subsequently amortized over the term of the line-of-credit arrangement. The cumulative guidance, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. The Company elected to early adopt ASU 2015-03 and ASU 2015-15 during the fourth quarter of 2015. As a result, for all periods presented, deferred financing costs related to secured and unsecured debt are included as reductions to Secured debt, net and Unsecured debt, net , respectively, on the accompanying Consolidated Balance Sheets and deferred financing costs related to revolving credit facilities are included within Other assets on the accompanying Consolidated Balance Sheets. At December 31, 2015, $7.9 million , $5.5 million and $12.4 million of deferred financing costs were included within Other assets , Secured debt, net , and Unsecured debt, net , respectively. At December 31, 2014, the following amounts of deferred financing costs were reclassified ( in thousands ): Deferred financing costs Other assets Secured debt, net Unsecured Debt, net December 31, 2014 As previously presented $ 22,686 $ 105,202 $ 1,361,529 $ 2,221,576 Reclassification of deferred financing costs (22,686 ) 4,880 (7,208 ) (10,598 ) As presented herein $ — $ 110,082 $ 1,354,321 $ 2,210,978
Real estate	Real Estate Real estate assets held for investment are carried at historical cost and consist of land, buildings and improvements, furniture, fixtures and equipment and other costs incurred during their development, acquisition and redevelopment. Expenditures for ordinary repair and maintenance costs are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to the acquisition and/or improvement of real estate assets are capitalized and depreciated over their estimated useful lives if the expenditures qualify as a betterment or the life of the related asset will be substantially extended beyond the original life expectancy. UDR purchases real estate investment properties and records the tangible and identifiable intangible assets and liabilities acquired based on their estimated fair value. The primary, although not only, identifiable intangible asset associated with our portfolio is the value of existing lease agreements. When recording the acquisition of a community, we first assign fair value to the estimated intangible value of the existing lease agreements and then to the estimated value of the land, building and fixtures assuming the community is vacant. The Company estimates the intangible value of the lease agreements by determining the lost revenue associated with a hypothetical lease-up. Depreciation on the building is based on the expected useful life of the asset and the in-place leases are amortized over their remaining average contractual life. Property acquisition costs are expensed as incurred. Quarterly or when changes in circumstances warrant, UDR will assess our real estate properties for indicators of impairment. In determining whether the Company has indicators of impairment in our real estate assets, we assess whether the long-lived asset’s carrying value exceeds the community’s undiscounted future cash flows, which is representative of projected net operating income (“NOI”) plus the residual value of the community. Our future cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. If such indicators of impairment are present and the carrying value exceeds the undiscounted cash flows of the community, an impairment loss is recognized equal to the excess of the carrying amount of the asset over its estimated fair value. Our estimates of fair market value represent our best estimate based primarily upon unobservable inputs related to rental rates, operating costs, growth rates, discount rates, capitalization rates, industry trends and reference to market rates and transactions. For long-lived assets to be disposed of, impairment losses are recognized when the fair value of the asset less estimated cost to sell is less than the carrying value of the asset. Properties classified as real estate held for sale generally represent properties that are actively marketed or contracted for sale with the closing expected to occur within the next twelve months. Real estate held for sale is carried at the lower of cost, net of accumulated depreciation, or fair value, less the cost to sell, determined on an asset-by-asset basis. Expenditures for ordinary repair and maintenance costs on held for sale properties are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to held for sale properties are capitalized at cost. Depreciation is not recorded on real estate held for sale. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets which are 35 to 55 years for buildings, 10 to 35 years for major improvements, and 3 to 10 years for furniture, fixtures, equipment, and other assets. Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation . The Company capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, for the years ended December 31, 2015 , 2014 , and 2013 were $6.3 million , $9.0 million and $11.1 million , respectively. During the years ended December 31, 2015 , 2014 , and 2013 , total interest capitalized was $16.1 million , $20.2 million , and $29.4 million , respectively. As each home in a capital project is completed and becomes available for lease-up, the Company ceases capitalization on the related portion and depreciation commences over the estimated useful life.
Cash and cash equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, demand deposits with financial institutions and short-term, highly liquid investments. We consider all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The majority of the Company’s cash and cash equivalents are held at major commercial banks.
Restricted cash	Restricted Cash Restricted cash consists of escrow deposits held by lenders for real estate taxes, insurance and replacement reserves, and security deposits.
Derivative financial instruments	Derivative Financial Instruments The Company utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. Derivative financial instruments are recorded on our Consolidated Balance Sheets as either an asset or liability and measured quarterly at their fair value. The changes in fair value for cash flow hedges that are deemed effective are reflected in other comprehensive income/(loss) and for non-designated derivative financial instruments in earnings. The ineffective component of cash flow hedges, if any, is recorded in earnings.
Revenue and real estate sales gain recognition	Revenue and Real Estate Sales Gain Recognition Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Company recognizes interest income, management and other fees and incentives when earned, and the amounts are fixed and determinable. For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value. Sales to entities in which we retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we retain. The Company recognizes any deferred gain when the property is sold to a third party. In transactions accounted for by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.
Discontinued operations	Discontinued Operations Prior to the adoption of ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , the results of operations for those properties sold during the year or classified as held for sale at the end of the current year were classified as discontinued operations in the current and prior periods. Further, to meet the discontinued operations criteria, the Company will not have any significant continuing involvement in the ownership or operation of the property after the sale or disposition. Once a property is classified as held for sale, depreciation is no longer recorded. However, if the Company determines that the property no longer meets the criteria for held for sale, the Company will recapture any unrecorded depreciation on the property. The assets and liabilities, if any, of properties classified as held for sale are presented separately on the Consolidated Balance Sheets at the lower of their carrying amount or their estimated fair value less the costs to sell the assets. (See Note 3, Discontinued Operations and Assets Held for Sale, for further discussion).
Income taxes	Income Taxes Due to the structure of the Company as a REIT and the nature of the operations for the operating properties, no provision for federal income taxes has been provided for at UDR. Historically, the Company has generally incurred only state and local excise and franchise taxes. UDR has elected for certain consolidated subsidiaries to be treated as taxable REIT subsidiaries (“TRS”). Income taxes for our TRS are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rate is recognized in earnings in the period of the enactment date. The Company’s deferred tax assets are generally the result of differing depreciable lives on capitalized assets and timing of expense recognition for certain accrued liabilities. As of December 31, 2015 and 2014 , UDR’s net deferred tax asset of $11.8 million , net of valuation allowance of $0.1 million , and $7.0 million , which had no valuation allowance, respectively, was included in Other assets on the Consolidated Balance Sheets. GAAP defines a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. GAAP also provides guidance on derecognition, classification, interest and penalties, accounting for interim periods, disclosure and transition. The Company recognizes its tax positions and evaluates them using a two-step process. First, UDR determines whether a tax position is more likely tha n not (greater than 50 percent probability) to b e sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. The Company will determine the amount of benefit to recognize and record the amount that is more likely than not to be realized upon ultimate settlement. UDR had no material unrecognized tax benefit, accrued interest or penalties at December 31, 2015 . UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2011 through 2014 remain open to examination by tax jurisdictions to which we are subject. When applicable, UDR recognizes interest and/or penalties related to uncertain tax positions in income tax expense.
Advertising costs	Advertising Costs All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item
Comprehensive income	Comprehensive Income/(Loss) Comprehensive income/(loss), which is defined as the change in equity during each period from transactions and other events and circumstances from nonowner sources, including all changes in equity during a period except for those resulting from investments by or distributions to stockholders, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the years ended December 31, 2015 , 2014 , and 2013 , the Company's other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges, (gain)/loss on derivative instruments and marketable securities reclassified from other comprehensive income/(loss) into earnings, and the allocation of other comprehensive income/(loss) to redeemable noncontrolling interests. The (gain)/loss on derivative instruments reclassified from other comprehensive income/(loss) is included in interest expense in the accompanying Consolidated Statements of Operations. See Note 13, Derivatives and Hedging Activity, for further discussion. The (gain)/loss on marketable securities reclassified from other comprehensive income/(loss) is included in Interest income and other income/(expense), net on the Consolidated Statements of Operations. The allocation of other comprehensive income/(loss) to redeemable noncontrolling interests during the years ended December 31, 2015 , 2014 , and 2013 was $(0.3) million , $(0.1) million , and $0.3 million , respectively.
Use of estimates	Use of Estimates The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates.
Market concentration risk	Market Concentration Risk The Company is subject to increased exposure from economic and other competitive factors specific to markets where the Company holds a significant percentage of the carrying value of its real estate portfolio. At December 31, 2015 , the Company held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; Metropolitan D.C.; and New York, New York markets.
United Dominion Reality L.P.
Entity Information [Line Items]
Recent Accounting Pronouncements	Recent Accounting Pronouncements In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , which incorporates a requirement that a disposition represent a strategic shift in an entity’s operations into the definition of a discontinued operation. In accordance with the ASU, a discontinued operation represents (1) a component of an entity or group of components that has been disposed of or is classified as held for sale in a single transaction and represents a strategic shift that has or will have a major effect on an entity’s financial results, or (2) an acquired business that is classified as held for sale on the date of acquisition. A strategic shift could include a disposal of (1) a separate major line of business, (2) a separate major geographic area of operations, (3) a major equity method investment, or (4) other major parts of an entity. The standard requires prospective application and will be effective for interim and annual periods beginning on or after December 15, 2014, with early adoption permitted. The early adoption provision excludes components of an entity that were sold or classified as held for sale prior to the adoption of the standard. The Operating Partnership elected to early adopt this standard effective January 1, 2014, which had a significant impact on the Operating Partnership’s consolidated financial statements as further discussed in Note 3, Discontinued Operations . Subsequent to the Operating Partnership’s adoption of ASU 2014-08, the sale of real estate that does not meet the definition of a discontinued operation under the standard is included in Gain/(loss) on sale of real estate owned, net of tax on the Consolidated Statements of Operations. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The updated standard will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The standard specifically excludes lease contracts. The ASU allows for the use of either the full or modified retrospective transition method, and the standard will be effective for the Operating Partnership on January 1, 2017; early adoption is not permitted. The Operating Partnership has not yet selected a transition method and we are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis , which makes changes to both the variable interest model and the voting model of consolidation. Under ASU 2015-02, companies will need to re-evaluate whether an entity meets the criteria to be considered a variable interest entity (“VIE”) or whether the consolidation of an entity should be assessed under the voting model. The new standard specifically eliminates the presumption in the current voting model that a general partner controls a limited partnership or similar entity unless that presumption can be overcome. The new standard will be effective for the Operating Partnership beginning on January 1, 2016 and must be applied using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the period of adoption or retrospectively to each period presented. The Operating Partnership does not expect the adoption of the new standard to result in the consolidation of entities not previously consolidated or the deconsolidation of any entities previously consolidated. Upon adopting the new standard, the Operating Partnership expects that the DownREIT Partnership will become a VIE as the limited partners lack substantive kick-out rights and substantive participating rights. The Operating Partnership does not expect to be the primary beneficiary of the DownREIT Partnership and will continue to record its interest as an equity method investment. In April 2015, the FASB issued ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, to revise the presentation of debt issuance costs. Under ASU 2015-03, entities will present debt issuance costs in their balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the deferred costs will continue to be included in interest expense. ASU 2015-03 does not directly address presentation or subsequent measurement of issuance costs related to line-of-credit arrangements. In August 2015, the FASB issued ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , which clarifies that such costs may be presented as an asset and subsequently amortized over the term of the line-of-credit arrangement. The cumulative guidance, which is to be applied retrospectively to all prior periods, is effective for fiscal years beginning after December 15, 2015, with early adoption permitted for financial statements that have not been previously issued. The Operating Partnership elected to early adopt ASU 2015-03 and ASU 2015-15 during the fourth quarter of 2015. As a result, at December 31, 2015 and 2014, deferred financing costs of $2.2 million and $4.5 million , respectively, are included as a reduction to Secured debt, net on the accompanying Consolidated Balance Sheets. At December 31, 2014, Secured debt, net previously disclosed as $932.0 million has been adjusted to $927.5 million in the accompanying Consolidated Balance Sheets. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments , which requires that the cumulative impact of a measurement-period adjustment, including impacts on prior periods, be recognized in the reporting period in which the adjustment amount is determined and, therefore, eliminates the requirement to retrospectively account for the adjustment in prior periods presented. The new standard will be effective for the Operating Partnership beginning on January 1, 2016 and must be applied prospectively to measurement-period adjustments that occur after the effective date. The Operating Partnership will comply with the new guidance upon adoption.
Real estate	Real Estate Real estate assets held for investment are carried at historical cost and consist of land, buildings and improvements, furniture, fixtures and equipment and other costs incurred during their development, acquisition and redevelopment. Expenditures for ordinary repair and maintenance costs are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to the acquisition and/or improvement of real estate assets are capitalized and depreciated over their estimated useful lives if the expenditures qualify as a betterment or the life of the related asset will be substantially extended beyond the original life expectancy. The Operating Partnership purchases real estate investment properties and records the tangible and identifiable intangible assets and liabilities acquired based on their estimated fair value. The primary, although not only, identifiable intangible asset associated with our portfolio is the value of existing lease agreements. When recording the acquisition of a community, we first assign fair value to the estimated intangible value of the existing lease agreements and then to the estimated value of the land, building and fixtures assuming the community is vacant. The Operating Partnership estimates the intangible value of the lease agreements by determining the lost revenue associated with a hypothetical lease-up. Depreciation on the building is based on the expected useful life of the asset and the in-place leases are amortized over their remaining average contractual life. Property acquisition costs are expensed as incurred. Quarterly or when changes in circumstances warrant, the Operating Partnership will assess our real estate properties for indicators of impairment. In determining whether the Operating Partnership has indicators of impairment in our real estate assets, we assess whether the long-lived asset’s carrying value exceeds the community’s undiscounted future cash flows, which is representative of projected net operating income (“NOI”) plus the residual value of the community. Our future cash flow estimates are based upon historical results adjusted to reflect our best estimate of future market and operating conditions and our estimated holding periods. If such indicators of impairment are present and the carrying value exceeds the undiscounted cash flows of the community, an impairment loss is recognized equal to the excess of the carrying amount of the asset over its estimated fair value. Our estimates of fair market value represent our best estimate based primarily upon unobservable inputs related to rental rates, operating costs, growth rates, discount rates and capitalization rates, industry trends and reference to market rates and transactions. For long-lived assets to be disposed of, impairment losses are recognized when the fair value of the asset less estimated cost to sell is less than the carrying value of the asset. Properties classified as real estate held for sale generally represent properties that are actively marketed or contracted for sale with the closing expected to occur within the next twelve months. Real estate held for sale is carried at the lower of cost, net of accumulated depreciation, or fair value, less the cost to sell, determined on an asset-by-asset basis. Expenditures for ordinary repair and maintenance costs on held for sale properties are charged to expense as incurred. Expenditures for improvements, renovations, and replacements related to held for sale properties are capitalized at cost. Depreciation is not recorded on real estate held for sale. Depreciation is computed on a straight-line basis over the estimated useful lives of the related assets which are 35 to 55 years for buildings, 10 to 35 years for major improvements, and 3 to 10 years for furniture, fixtures, equipment, and other assets. Predevelopment, development, and redevelopment projects and related costs are capitalized and reported on the Consolidated Balance Sheets as Total real estate owned, net of accumulated depreciation . The Operating Partnership capitalizes costs directly related to the predevelopment, development, and redevelopment of a capital project, which include, but are not limited to, interest, real estate taxes, insurance, and allocated development and redevelopment overhead related to support costs for personnel working on the capital projects. We use our professional judgment in determining whether such costs meet the criteria for capitalization or must be expensed as incurred. These costs are capitalized only during the period in which activities necessary to ready an asset for its intended use are in progress and such costs are incremental and identifiable to a specific activity to get the asset ready for its intended use. These costs, excluding the direct costs of development and redevelopment and capitalized interest, for the years ended December 31, 2015 , 2014 , and 2013 were $0.7 million , $2.0 million , and $2.5 million , respectively. During the years ended December 31, 2015 , 2014 , and 2013 , total interest capitalized was $0.2 million , $2.9 million , and $5.9 million , respectively. As each home in a capital project is completed and becomes available for lease-up, the Operating Partnership ceases capitalization on the related portion and depreciation commences over the estimated useful life.
Cash and cash equivalents	Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, demand deposits with financial institutions and short-term, highly liquid investments. We consider all highly liquid investments with maturities of three months or less when purchased to be cash equivalents. The majority of the Operating Partnership’s cash and cash equivalents are held at major commercial banks.
Restricted cash	Restricted Cash Restricted cash consists of escrow deposits held by lenders for real estate taxes, insurance and replacement reserves, and security deposits.
Derivative financial instruments	Derivative Financial Instruments The General Partner utilizes derivative financial instruments to manage interest rate risk and generally designates these financial instruments as cash flow hedges. Derivative financial instruments associated with the Operating Partnership’s allocation of the General Partner’s debt are recorded on our Consolidated Balance Sheets as either an asset or liability and measured quarterly at their fair value. The changes in fair value for the General Partner’s cash flow hedges allocated to the Operating Partnership that are deemed effective are reflected in other comprehensive income and for non-designated derivative financial instruments in earnings. The ineffective component of cash flow hedges, if any, is recorded in earnings.
Non-controlling interests	Noncontrolling Interests The noncontrolling interests represent the General Partner’s interests in certain consolidated subsidiaries and are presented in the capital section of the Consolidated Balance Sheets since these interests are not convertible or redeemable into any other ownership interests of the Operating Partnership. During the year ended December 31, 2013, the Operating Partnership corrected an error in the General Partner’s ownership interest in one of the consolidated subsidiaries. The correction increased the General Partner’s ownership interest resulting in a cumulative adjustment increasing Net (income)/loss attributable to noncontrolling interests by $3.3 million on the Consolidated Statements of Operations with a corresponding increase to Noncontrolling interests on the Consolidated Balance Sheets. Management believes the impact of the cumulative adjustment in 2013 is immaterial to the financial statements taken as a whole.
Revenue and real estate sales gain recognition	Revenue and Real Estate Sales Gain Recognition Rental income related to leases is recognized on an accrual basis when due from residents and tenants in accordance with GAAP. Rental payments are generally due on a monthly basis and recognized when earned. The Operating Partnership recognizes interest income, management and other fees and incentives when earned, fixed and determinable. For sale transactions meeting the requirements for full accrual profit recognition, we remove the related assets and liabilities from our Consolidated Balance Sheets and record the gain or loss in the period the transaction closes. For sale transactions that do not meet the full accrual sale criteria due to our continuing involvement, we evaluate the nature of the continuing involvement and account for the transaction under an alternate method of accounting. Unless certain limited criteria are met, non-monetary transactions, including property exchanges, are accounted for at fair value. Sales to entities in which we or our General Partner retain or otherwise own an interest are accounted for as partial sales. If all other requirements for recognizing profit under the full accrual method have been satisfied and no other forms of continuing involvement are present, we recognize profit proportionate to the outside interest in the buyer and defer the gain on the interest we or our General Partner retain. The Operating Partnership recognizes any deferred gain when the property is sold to a third party. In transactions accounted by us as partial sales, we determine if the buyer of the majority equity interest in the venture was provided a preference as to cash flows in either an operating or a capital waterfall. If a cash flow preference has been provided, we recognize profit only to the extent that proceeds from the sale of the majority equity interest exceed costs related to the entire property.
Discontinued operations	Discontinued Operations Prior to the adoption of ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity , the results of operations for those properties sold during the year or classified as held for sale at the end of the current year were classified as discontinued operations in the current and prior periods. Further, to meet the discontinued operations criteria, the Operating Partnership or related parties will not have any significant continuing involvement in the ownership or operation of the property after the sale or disposition. Once a property is classified as held for sale, depreciation is no longer recorded. However, if the Operating Partnership determines that the property no longer meets the criteria for held for sale, the Operating Partnership will recapture any unrecorded depreciation on the property. The assets and liabilities, if any, of properties classified as held for sale are presented separately on the Consolidated Balance Sheets at lower of their carrying amount or their estimated fair value less the costs to sell the assets. (See Note 3, Discontinued Operations and Assets Held for Sale, for further discussion).
Earnings per Operating Partnership Unit	Basic income/(loss) per OP Unit is computed by dividing net income/(loss) attributable to general and limited partner unitholders by the weighted average number of general and limited partner units (including redeemable OP Units) outstanding during the year. Diluted income/(loss) per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units or resulted in the issuance of OP Units and then shared in the income/(loss) of the Operating Partnership. For the years ended December 31, 2015 , 2014 , and 2013 , there were no dilutive instruments, and therefore, diluted income/(loss) per OP Unit and basic income/(loss) per OP Unit are the same. See Note 10, Capital Structure , for further discussion on redemption rights of OP Units.
Allocation of General and Administrative Expenses	Allocation of General and Administrative Expenses The Operating Partnership is charged directly for general and administrative expenses it incurs. The Operating Partnership is also charged with other general and administrative expenses that have been allocated by the General Partner to each of its subsidiaries, including the Operating Partnership, based on each subsidiary’s pro-rata portion of UDR’s total apartment homes. (See Note 7, Related Party Transactions .)
Income taxes	Income Taxes The taxable income or loss of the Operating Partnership is reported on the tax returns of the partners. Accordingly, no provision has been made in the accompanying financial statements for federal or state income taxes on income that is passed through to the partners. However, any state or local revenue, excise or franchise taxes that result from the operating activities of the Operating Partnership are recorded at the entity level. The Operating Partnership’s tax returns are subject to examination by federal and state taxing authorities. Net income for financial reporting purposes differs from the net income for income tax reporting purposes primarily due to temporary differences, principally real estate depreciation and the tax deferral of certain gains on property sales. The differences in depreciation result from differences in the book and tax basis of certain real estate assets and the differences in the methods of depreciation and lives of the real estate assets. The Operating Partnership follows the accounting guidance within GAAP, with respect to how uncertain tax positions should be recognized, measured, presented, and disclosed in the financial statements. The guidance requires the accounting and disclosure of tax positions taken or expected to be taken in the course of preparing the Operating Partnership’s tax returns to determine whether the tax positions are “more-likely-than-not” of being sustained by the applicable tax authority. Tax positions not deemed to meet the more-likely-than-not threshold would be recorded as a tax benefit or expense in the current year. Management of the Operating Partnership is required to analyze all open tax years, as defined by the statute of limitations, for all major jurisdictions, which include federal and certain states. The Operating Partnership has no examinations in progress and none are expected at this time. Management of the Operating Partnership has reviewed all open tax years (2011 through 2014) and major jurisdictions, and concluded there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns.
Advertising costs	Advertising Costs All advertising costs are expensed as incurred and reported on the Consolidated Statements of Operations within the line item General and administrative . During the years ended December 31, 2015 , 2014 , and 2013 , total advertising expense from continuing and discontinued operations was $2.4 million , $2.5 million , and $2.5 million , respectively.
Comprehensive income	Comprehensive Income/(Loss) Comprehensive income/(loss), which is defined as the change in capital during each period from transactions and other events and circumstances from nonowner sources, including all changes in capital during a period except for those resulting from investments by or distributions to partners, is displayed in the accompanying Consolidated Statements of Comprehensive Income/(Loss). For the years ended December 31, 2015 , 2014 , and 2013 , the Operating Partnership’s other comprehensive income/(loss) consisted of the gain/(loss) (effective portion) on derivative instruments that are designated as and qualify as cash flow hedges and (gain)/loss reclassified from other comprehensive income/(loss) into earnings. The (gain)/loss reclassified from other comprehensive income/(loss) is included in Interest expense on the Consolidated Statements of Operations. See Note 9, Derivatives and Hedging Activity, for further discussion.
Use of estimates	Use of Estimates The preparation of these financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent liabilities at the dates of the financial statements and the amounts of revenues and expenses during the reporting periods. Actual amounts realized or paid could differ from those estimates.
Market concentration risk	Market Concentration Risk The Operating Partnership is subject to increased exposure from economic and other competitive factors specific to those markets where it holds a significant percentage of the carrying value of its real estate portfolio at December 31, 2015 , the Operating Partnership held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; San Francisco, California; and New York, New York markets.

Income_(Loss) Per Share (UNIT51

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) Income/(Loss) Per Share (UNITED DOMNION REALTY, L.P.) (Policies)	12 Months Ended
	Dec. 31, 2015
United Dominion Reality L P [Member]
Earnings Per Share, Policy [Policy Text Block]	Basic income/(loss) per OP Unit is computed by dividing net income/(loss) attributable to general and limited partner unitholders by the weighted average number of general and limited partner units (including redeemable OP Units) outstanding during the year. Diluted income/(loss) per OP Unit reflects the potential dilution that could occur if securities or other contracts to issue OP Units were exercised or converted into OP Units or resulted in the issuance of OP Units and then shared in the income/(loss) of the Operating Partnership. For the years ended December 31, 2015 , 2014 , and 2013 , there were no dilutive instruments, and therefore, diluted income/(loss) per OP Unit and basic income/(loss) per OP Unit are the same. See Note 10, Capital Structure , for further discussion on redemption rights of OP Units.

Significant Accounting Polici52

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Notes receivable	Notes Receivable The following table summarizes our notes receivable, net as of December 31, 2015 and 2014 ( dollars in thousands ): Interest rate at Balance Outstanding December 31, December 31, December 31, Note due February 2017 (a) 10.00 % $ 12,994 $ 11,869 Note due July 2017 (b) 8.00 % 2,500 2,500 Note due October 2020 (c) 8.00 % 1,200 — Total notes receivable, net $ 16,694 $ 14,369
Computation of basic and diluted earning per share	The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per share: Income/(loss) from continuing operations $ 105,482 $ 16,260 $ 2,340 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,572 — (Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) 48 (Income)/loss from continuing operations attributable to noncontrolling interests (3 ) 3 60 Income/(loss) from continuing operations attributable to UDR, Inc. 340,383 154,324 2,448 Distributions to preferred stockholders - Series E (Convertible) (3,722 ) (3,724 ) (3,724 ) Income/(loss) from continuing operations attributable to common stockholders - basic 336,661 150,600 (1,276 ) Dilutive distributions to preferred stockholders - Series E (Convertible) 3,722 — — Income/(loss) from continuing operations attributable to common stockholders - dilutive $ 340,383 $ 150,600 $ (1,276 ) Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 (Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership — — (1,578 ) Income/(loss) from discontinued operations attributable to common stockholders $ — $ 10 $ 42,364 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Denominator for income/(loss) per share - basic and diluted: Weighted average common shares outstanding 259,873 252,707 250,684 Non-vested restricted stock awards (1,204 ) (1,179 ) (715 ) Denominator for income/(loss) per share - basic 258,669 251,528 249,969 Incremental shares issuable from assumed conversion of dilutive preferred stock, stock options and unvested restricted stock 5,083 1,917 — Denominator for income/(loss) per share - diluted 263,752 253,445 249,969 Income/(loss) per weighted average common share - basic: Income/(loss) from continuing operations attributable to common stockholders $ 1.30 $ 0.60 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.30 $ 0.60 $ 0.16 Income/(loss) per weighted average common share - diluted: Income/(loss) from continuing operations attributable to common stockholders $ 1.29 $ 0.59 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.29 $ 0.59 $ 0.16

Real Estate Owned (Tables)

Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2015
Real Estate [Abstract]
Business Acquisition, Pro Forma Information [Table Text Block]	The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the Company’s results of operations for future periods ( in thousands ): Year Ended December 31, 2015 2014 Pro forma revenues $ 943,421 $ 877,287 Pro forma net income/(loss) attributable to common stockholders $ 319,385 $ 105,875
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	The following table summarizes the allocation of the purchase price as of the acquisition date ( in thousands ): Assets: Land $ 173,924 Buildings 708,455 Intangible assets 25,455 Total assets 907,834 Liabilities: Secured debt (96,486 ) Below-market in-place leases (542 ) Total liabilities (97,028 ) Total assets acquired less liabilities assumed $ 810,806
Summary of carrying amounts for real estate owned (at cost)	The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2015 and 2014 (dollars in thousands): December 31, December 31, 2014 Land $ 1,833,156 $ 1,790,281 Depreciable property — held and used: Land improvements 173,821 189,940 Building, improvements, and furniture, fixtures and equipment 7,046,622 6,225,406 Under development: Land 78,085 24,584 Building, improvements, and furniture, fixtures and equipment 45,987 153,048 Real estate held for disposition: Land 9,963 — Building, improvements, and furniture, fixtures and equipment 2,642 — Real estate owned 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Real estate owned, net $ 6,543,402 $ 5,948,487

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of (loss)/income from discontinued operations	The following is a summary of Income/(loss) from discontinued operations, net of tax for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Year Ended December 31, 2015 2014 2013 Rental income $ — $ 147 $ 9,152 Rental expenses — 225 3,511 Property management — 4 252 Real estate depreciation — — 1,958 Interest income and other (income)/expense, net — 21 (62 ) Income/(loss) attributable to disposed properties and assets held for sale — (103 ) 3,493 Net gain/(loss) on the sale of depreciable property — 75 41,919 Impairment charges — — (2,355 ) Income tax benefit/(provision) — 38 885 Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 Income/(loss) from discontinued operations attributable to UDR, Inc. $ — $ 10 $ 42,364

Joint Ventures (Tables)

Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Summary of investments in unconsolidated joint ventures	The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships. The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of December 31, 2015 and 2014 (dollars in thousands) : Joint Venture Location of Properties Number of Properties Number of Apartment Homes Investment at UDR’s Ownership Interest December 31, December 31, December 31, December 31, December 31, December 31, Operating and development: UDR/MetLife I Various 4 land parcels — $ 15,894 $ 13,306 17.2 % 15.7 % UDR/MetLife II (a) Various 21 operating communities 4,642 425,230 431,277 50.0 % 50.0 % Other UDR/MetLife Development Joint Ventures 1 operating community; 4 development communities (b); Various 1 land parcels 1,437 171,659 134,939 50.6 % 50.6 % UDR/MetLife Vitruvian Park ® Addison, TX 3 operating communities; 6 land parcels 1,130 73,469 80,302 50.0 % 50.0 % UDR/KFH Washington, D.C. 3 operating communities 660 17,211 21,596 30.0 % 30.0 % Texas (c) Texas — — — (25,901 ) — % 20.0 % Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment 703,463 655,519 Investment at Income from investments for the years ending December 31, Location Rate Years To Maturity December 31, December 31, 2015 2014 2013 Participating loan investment: Steele Creek Denver, CO 6.5% 1.6 90,747 62,707 $ 5,453 $ 2,350 $ 156 Preferred equity investment: West Coast Development Joint Venture (d) Various 6.5% — 144,696 — $ 3,692 $ — $ — Total investment in and advances to unconsolidated joint ventures, net $ 938,906 $ 718,226 (a) In September 2015, the 717 Olympic community, which is held by the UDR/MetLife II joint venture, experienced extensive water damage due a ruptured water pipe. For the year ended December 31, 2015, the Company recorded losses of $2.5 million , its proportionate share of the total losses incurred. (b) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes. As of December 31, 2015 , no apartment homes had been completed in Other UDR/MetLife Development Joint Ventures. (c) In January 2015, the eight communities held by the Texas joint venture were sold, generating net proceeds to UDR of $44.2 million . The Company recorded promote and fee income of $10.0 million and a gain of $59.4 million (including $24.2 million of previously deferred gains) in connection with the sale. (d) In May 2015, the Company entered into a joint venture agreement with real estate private equity firm, The Wolff Company (“Wolff”), and agreed to pay $136.3 million for a 48 percent ownership interest in a portfolio of five communities that are currently under construction (the "West Coast Development Joint Venture"). The communities are located in three of the Company’s core, coastal markets: Metro Seattle, Los Angeles and Orange County, CA. UDR earns a 6.5 percent preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80 percent occupancy for ninety consecutive days, while Wolff is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage. The Company will serve as property manager and be paid a management fee during the lease-up phase and subsequent operation of each of the communities. Wolff is the general partner of the joint venture and the developer of the communities. The Company has a fixed price option to acquire Wolff’s remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total price will be $597.4 million . In the event the Company does not exercise its options to purchase at least two communities, Wolff will be entitled to earn a contingent disposition fee equal to 6.5 percent return on its implied equity in the communities not acquired. Wolff is providing certain guaranties and there are construction loans on all five communities. Once completed, the five communities will contain 1,533 homes. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting. The Company's recorded equity investment in the West Coast Development Joint Venture at December 31, 2015 of $144.7 million is inclusive of outside basis costs and our accrued but unpaid preferred return. During the year ended December 31, 2015 , the Company earned a preferred return of $5.2 million , offset by its share of the West Coast Development Joint Venture transaction expenses of $1.5 million .
Financial information relating to unconsolidated joint ventures operations	Combined summary financial information relating to all of the unconsolidated joint ventures and partnerships operations (not just our proportionate share), is presented below for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands): As of and For the Year Ended December 31, 2015 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 541 $ 170,062 $ 7,634 $ 22,139 $ 19,338 $ — $ 219,714 Property operating expenses (906 ) (63,516 ) (3,826 ) (11,519 ) (7,733 ) — (87,500 ) Real estate depreciation and amortization (818 ) (46,616 ) (6,897 ) (6,639 ) (14,522 ) — (75,492 ) Operating income/(loss) (1,183 ) 59,930 (3,089 ) 3,981 (2,917 ) — 56,722 Interest expense — (52,037 ) (2,566 ) (4,848 ) (5,539 ) — (64,990 ) Income/(loss) from discontinued operations (20 ) — — — — 184,138 184,118 Net income/(loss) $ (1,203 ) $ 7,893 $ (5,655 ) $ (867 ) $ (8,456 ) $ 184,138 $ 175,850 UDR recorded income (loss) from unconsolidated entities $ (513 ) $ 3,578 $ 6,088 $ (3,711 ) $ (2,537 ) $ 59,424 $ 62,329 Condensed Balance Sheets: Total real estate, net $ 92,915 $ 1,942,630 $ 604,611 $ 273,897 $ 221,704 $ — $ 3,135,757 Cash and cash equivalents 1,202 20,767 5,996 7,185 1,320 10 36,480 Other assets 174 24,914 1,921 2,317 565 — 29,891 Total assets 94,291 1,988,311 612,528 283,399 223,589 10 3,202,128 Amount due to/(from) UDR 2 — 5,929 908 427 — 7,266 Third party debt — 1,122,662 201,114 126,388 164,299 — 1,614,463 Accounts payable and accrued liabilities 395 24,244 62,267 7,137 1,480 — 95,523 Total liabilities 397 1,146,906 269,310 134,433 166,206 — 1,717,252 Total equity $ 93,894 $ 841,405 $ 343,218 $ 148,966 $ 57,383 $ 10 $ 1,484,876 UDR’s investment in and advances to unconsolidated joint ventures $ 15,894 $ 425,230 $ 407,102 $ 73,469 $ 17,211 $ — $ 938,906 As of and For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 727 $ 152,047 $ 1,579 $ 19,376 $ 19,724 $ — $ 193,453 Property operating expenses 618 52,150 1,122 10,711 7,498 — 72,099 Real estate depreciation and amortization 2,130 41,504 3,959 7,380 14,426 — 69,399 Operating income/(loss) (2,021 ) 58,393 (3,502 ) 1,285 (2,200 ) — 51,955 Interest expense — (48,493 ) (94 ) (4,131 ) (5,873 ) — (58,591 ) Income/(loss) from discontinued operations (31,802 ) — — — — (4,229 ) (36,031 ) Net income/(loss) $ (33,823 ) $ 9,900 $ (3,596 ) $ (2,846 ) $ (8,073 ) $ (4,229 ) $ (42,667 ) UDR recorded income/(loss) from unconsolidated entities $ (2,955 ) $ 2,814 $ 576 $ (4,068 ) $ (2,601 ) $ (772 ) $ (7,006 ) Condensed Balance Sheets: Total real estate, net $ 89,482 $ 1,986,237 $ 351,861 $ 278,600 $ 235,623 $ — $ 2,941,803 Assets held for sale 1,978 — — — — 214,218 216,196 Cash and cash equivalents 1,983 15,245 6,239 6,570 2,507 — 32,544 Other assets (a) (146 ) 12,938 1,101 3,248 708 — 17,849 Total assets (a) 93,297 2,014,420 359,201 288,418 238,838 214,218 3,208,392 Amount due to/(from) UDR 107 (444 ) 843 1,960 531 — 2,997 Third party debt (a) — 1,140,458 65,408 122,964 164,789 — 1,493,619 Liabilities held for sale 5,110 — — — — 224,596 229,706 Accounts payable and accrued liabilities (a) 749 17,573 17,851 6,766 1,396 — 44,335 Total liabilities (a) 5,966 1,157,587 84,102 131,690 166,716 224,596 1,770,657 Total equity $ 87,331 $ 856,833 $ 275,099 $ 156,728 $ 72,122 $ (10,378 ) $ 1,437,735 UDR’s investment in and advances to unconsolidated joint ventures $ 13,306 $ 431,277 $ 197,646 $ 80,302 $ 21,596 $ (25,901 ) $ 718,226 (a) The Company elected to early adopt FASB ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, and ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , during the fourth quarter of 2015. See Note 2, Significant Accounting Policies , for a complete description of the ASUs and their impact. Under the ASUs, deferred financing costs related to debt are treated as offsets to the debt instead of assets. As a result of adopting the ASUs, the following retrospective changes were made to the above table: For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Other assets - as previously reported $ (146 ) $ 19,589 $ 4,203 $ 3,933 $ 1,128 $ — $ 28,707 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Other assets - as presented above $ (146 ) $ 12,938 $ 1,101 $ 3,248 $ 708 $ — $ 17,849 Total assets - as previously reported $ 93,297 $ 2,021,071 $ 362,303 $ 289,103 $ 239,258 $ 214,218 $ 3,219,250 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total assets - as presented above $ 93,297 $ 2,014,420 $ 359,201 $ 288,418 $ 238,838 $ 214,218 $ 3,208,392 Third party debt - as previously reported $ — $ 1,147,109 $ 68,510 $ 123,649 $ 165,209 $ — $ 1,504,477 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Third party debt - as presented above $ — $ 1,140,458 $ 65,408 $ 122,964 $ 164,789 $ — $ 1,493,619 Accounts payable and accrued liabilities - as previously reported $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Deferred financing costs — — — — — — — Accounts payable and accrued liabilities - as presented above $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Total liabilities - as previously reported $ 5,966 $ 1,164,238 $ 87,204 $ 132,375 $ 167,136 $ 224,596 $ 1,781,515 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total liabilities - as presented above $ 5,966 $ 1,157,587 $ 84,102 $ 131,690 $ 166,716 $ 224,596 $ 1,770,657 For the Year Ended December 31, 2013 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 691 $ 109,926 $ 5,324 $ 7,680 $ 19,221 $ — $ 142,842 Property operating expenses 621 33,809 3,292 4,633 7,035 — 49,390 Real estate depreciation and amortization 115 30,122 3,564 3,830 14,199 — 51,830 Operating income/(loss) (45 ) 45,995 (1,532 ) (783 ) (2,013 ) — 41,622 Interest expense — (37,055 ) (913 ) (1,886 ) (5,872 ) — (45,726 ) Other income/(expense) — 1 — — — — 1 Income/(loss) from discontinued operations (22,388 ) — — — — (9,584 ) (31,972 ) Net income/(loss) $ (22,433 ) $ 8,941 $ (2,445 ) $ (2,669 ) $ (7,885 ) $ (9,584 ) $ (36,075 ) UDR recorded income/(loss) from unconsolidated entities $ (4,675 ) $ 4,471 $ 6,224 $ (2,851 ) $ (2,366 ) $ (1,218 ) $ (415 )

Secured Debt and Unsecured De56

Secured Debt and Unsecured Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Secured debt instruments	The following is a summary of our secured and unsecured debt at December 31, 2015 and 2014 ( dollars in thousands): Principal Outstanding For the Year Ended December 31, 2015 Weighted Average Interest Rate Weighted Average Years to Maturity Number of Communities Encumbered December 31, 2015 2014 Secured Debt: Fixed Rate Debt Mortgage notes payable (a) $ 442,617 $ 401,210 4.57 % 4.5 8 Fannie Mae credit facilities (b) 514,462 568,086 5.23 % 3.1 18 Deferred financing costs (4,278 ) (5,583 ) Total fixed rate secured debt, net 952,801 963,713 4.93 % 3.7 26 Variable Rate Debt Mortgage notes payable 31,337 31,337 2.19 % 1.1 1 Tax-exempt secured notes payable (c) 94,700 94,700 0.75 % 7.2 2 Fannie Mae credit facilities (b) 299,378 266,196 1.71 % 4.1 8 Deferred financing costs (1,271 ) (1,625 ) Total variable rate secured debt, net 424,144 390,608 1.53 % 4.5 11 Total Secured Debt, net 1,376,945 1,354,321 3.88 % 4.0 37 Unsecured Debt: Variable Rate Debt Borrowings outstanding under unsecured credit facilities due January 2020 and December 2017, respectively (d) (h) 150,000 152,500 1.19 % 4.1 Borrowings outstanding under unsecured working capital credit facility due January 2019 (e) — — — % 3.0 1.21% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 35,000 35,000 1.21 % 5.1 Fixed Rate Debt 5.25% Medium-Term Notes due January 2015 (net of discounts of $0 and $6, respectively) (f) — 325,169 — % 0.0 5.25% Medium-Term Notes due January 2016 (i) 83,260 83,260 5.25 % 0.0 6.21% Medium-Term Note due July 2016 (j) 12,091 — 6.21 % 0.5 4.25% Medium-Term Notes due June 2018 (net of discounts of $1,037 and $1,465, respectively) (h) 298,963 298,535 4.25 % 2.4 3.70% Medium-Term Notes due October 2020 (net of discounts of $38 and $46, respectively) (h) 299,962 299,954 3.70 % 4.8 1.44% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 315,000 315,000 1.44 % 5.1 4.63% Medium-Term Notes due January 2022 (net of discounts of $2,164 and $2,523, respectively) (h) 397,836 397,477 4.63 % 6.0 3.75% Medium-Term Notes due July 2024 (net of discounts of $886 and $990, respectively) (h) 299,114 299,010 3.75 % 8.5 8.50% Debentures due September 2024 15,644 15,644 8.50 % 8.7 4.00% Medium-Term Notes due October 2025 (net of discount of $671 and $0, respectively) (g) (h) 299,329 — 4.00 % 9.8 Other 24 27 N/A N/A Deferred financing costs (12,373 ) (10,598 ) N/A N/A Total Unsecured Debt, net 2,193,850 2,210,978 3.64 % 5.7 Total Debt, net $ 3,570,795 $ 3,565,299 3.74 % 5.0
Secured credit facilities	Further information related to these credit facilities is as follows (dollars in thousands) : December 31, December 31, 2014 Borrowings outstanding $ 813,840 $ 834,282 Weighted average borrowings during the period ended 822,521 835,873 Maximum daily borrowings during the period ended 834,003 837,564 Weighted average interest rate during the period ended 4.0 % 4.1 % Weighted average interest rate at the end of the period 3.9 % 4.0 %
Aggregate maturities of secured debt	The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next ten years subsequent to December 31, 2015 are as follows (dollars in thousands): Year Total Fixed Secured Debt Total Variable Secured Debt Total Secured Debt Total Unsecured Debt Total Debt 2016 $ 149,058 $ — $ 149,058 $ 95,053 $ 244,111 2017 179,189 96,337 275,526 — 275,526 2018 73,096 137,969 211,065 300,000 511,065 2019 247,796 67,700 315,496 — 315,496 2020 170,664 — 170,664 450,000 620,664 2021 — — — 350,000 350,000 2022 — — — 400,000 400,000 2023 — 96,409 96,409 — 96,409 2024 — — — 315,644 315,644 2025 127,600 — 127,600 300,000 427,600 Thereafter — 27,000 27,000 — 27,000 Subtotal 947,403 425,415 1,372,818 2,210,697 3,583,515 Non-cash (a) 5,398 (1,271 ) 4,127 (16,847 ) (12,720 ) Total $ 952,801 $ 424,144 $ 1,376,945 $ 2,193,850 $ 3,570,795
Summary of short-term bank borrowings under bank credit facility	The following is a summary of short-term bank borrowings under UDR’s revolving credit facility at December 31, 2015 and 2014 (dollars in thousands): December 31, 2015 December 31, 2014 Total revolving credit facility $ 1,100,000 $ 900,000 Borrowings outstanding at end of period (1) 150,000 152,500 Weighted average daily borrowings during the period ended 353,647 291,761 Maximum daily borrowings during the period ended 541,500 625,000 Weighted average interest rate during the period ended 1.1 % 1.2 % Interest rate at end of the period 1.2 % 1.1 %

Income_(Loss) Per Share Income_

Income/(Loss) Per Share Income/(Loss) Per Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per share: Income/(loss) from continuing operations $ 105,482 $ 16,260 $ 2,340 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,572 — (Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) 48 (Income)/loss from continuing operations attributable to noncontrolling interests (3 ) 3 60 Income/(loss) from continuing operations attributable to UDR, Inc. 340,383 154,324 2,448 Distributions to preferred stockholders - Series E (Convertible) (3,722 ) (3,724 ) (3,724 ) Income/(loss) from continuing operations attributable to common stockholders - basic 336,661 150,600 (1,276 ) Dilutive distributions to preferred stockholders - Series E (Convertible) 3,722 — — Income/(loss) from continuing operations attributable to common stockholders - dilutive $ 340,383 $ 150,600 $ (1,276 ) Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 (Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership — — (1,578 ) Income/(loss) from discontinued operations attributable to common stockholders $ — $ 10 $ 42,364 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Denominator for income/(loss) per share - basic and diluted: Weighted average common shares outstanding 259,873 252,707 250,684 Non-vested restricted stock awards (1,204 ) (1,179 ) (715 ) Denominator for income/(loss) per share - basic 258,669 251,528 249,969 Incremental shares issuable from assumed conversion of dilutive preferred stock, stock options and unvested restricted stock 5,083 1,917 — Denominator for income/(loss) per share - diluted 263,752 253,445 249,969 Income/(loss) per weighted average common share - basic: Income/(loss) from continuing operations attributable to common stockholders $ 1.30 $ 0.60 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.30 $ 0.60 $ 0.16 Income/(loss) per weighted average common share - diluted: Income/(loss) from continuing operations attributable to common stockholders $ 1.29 $ 0.59 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.29 $ 0.59 $ 0.16
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	The following table sets forth the additional shares of common stock outstanding by equity instrument if converted to common stock for each of the years ended December 31, 2015 , 2014 , and 2013 (shares in thousands) : Year Ended December 31, 2015 2014 2013 OP Units 12,947 9,247 9,337 DownREIT Units 16,229 — — Preferred Stock 3,032 3,036 3,036 Stock options and unvested restricted stock 2,051 1,917 1,584

Stockholders' Equity Stockholde

Stockholders' Equity Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Stockholders Equity [Table Text Block]	The following table presents the changes in the Company’s issued and outstanding shares of common and preferred stock for the years ended December 31, 2015 , 2014 and 2013 : Common Stock Preferred Stock Series E Series F Balance at December 31, 2012 250,139,408 2,803,812 2,464,183 Issuance/(forfeiture) of common and restricted shares, net 533,966 — — Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership 76,291 — — Balance at December 31, 2013 250,749,665 2,803,812 2,464,183 Issuance/(forfeiture) of common and restricted shares, net 801,054 — — Issuance of common shares through public offering 3,410,433 — — Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership 153,451 — — Balance at December 31, 2014 255,114,603 2,803,812 2,464,183 Issuance/(forfeiture) of common and restricted shares, net 270,628 — — Issuance of common shares through public offering 6,339,636 — — Adjustment for conversion of noncontrolling interest of unitholders in the Operating Partnership 112,174 — — Conversion of Series E Cumulative Convertible shares 7,480 (6,909 ) — Issuance of Series F shares — — 13,988,313 Balance at December 31, 2015 261,844,521 2,796,903 16,452,496

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock option and restricted stock activities	A summary of UDR’s stock option and restricted stock activities during the year ended December 31, 2015 is as follows: Option Outstanding Option Exercisable Restricted Stock Number of Options Weighted Average Exercise Price Number of Options Weighted Average Exercise Price Number of shares Weighted Average Fair Value Per Restricted Stock Balance, December 31, 2014 2,265,842 $ 12.82 2,265,842 $ 12.82 999,978 $ 23.98 Granted — — — — 551,293 32.67 Exercised (30,879 ) 25.10 (30,879 ) 25.10 — — Vested — — — — (736,204 ) 23.52 Forfeited — — — — (14,691 ) 23.24 Balance, December 31, 2015 2,234,963 $ 12.65 2,234,963 $ 12.65 800,376 $ 30.40

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of taxable distributions paid per common share	Taxable distributions paid per common share were taxable as follows for the years ended December 31, 2015 , 2014 , and 2013 : Year Ended December 31, 2015 2014 2013 Ordinary income $ 0.595 $ 0.695 $ 0.744 Qualified ordinary income — 0.139 — Long-term capital gain 0.329 0.105 0.114 Unrecaptured section 1250 gain 0.168 0.076 0.067 Total $ 1.092 $ 1.015 $ 0.925
Schedule of components of the provision for income taxes	The components of the provision for income taxes are as follows for the years ended December 31, 2015 , 2014 , and 2013 (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Income tax (benefit)/provision Current Federal $ 29 $ 147 $ (1,030 ) State 871 550 846 Total current 900 697 (184 ) Deferred Federal (4,173 ) 20,138 (6,907 ) State (613 ) 5,159 (1,190 ) Total deferred (4,786 ) 25,297 (8,097 ) Total income tax (benefit)/provision $ (3,886 ) $ 25,994 $ (8,281 ) Classification of income tax (benefit)/provision: Continuing operations $ (3,886 ) $ (15,098 ) $ (7,299 ) Gain/(loss) on sale of real estate owned — 41,087 — Discontinued operations — 5 (982 )
Schedule of components of TRS deferred tax assets and liabilities	The components of our TRS deferred tax assets and liabilities are as follows for the years ended December 31, 2015 , 2014 , and 2013 (dollars in thousands): Year Ended December 31, 2015 2014 2013 Deferred tax assets: Federal and state tax attributes $ 2,227 $ — $ 13,069 Book/tax depreciation 9,016 6,692 19,354 Construction capitalization differences — 75 — Debt and interest deductions — — 10,311 Other 707 401 — Total deferred tax assets 11,950 7,168 42,734 Valuation allowance (81 ) — (1,310 ) Net deferred tax assets 11,869 7,168 41,424 Deferred tax liabilities: Construction capitalization differences — — (3,766 ) Investment in partnerships — — (5,080 ) Other (107 ) (192 ) (305 ) Total deferred tax liabilities (107 ) (192 ) (9,151 ) Net deferred tax asset $ 11,762 $ 6,976 $ 32,273
Schedule of effective income tax rate reconciliation	Income tax benefit/(provision), net differed from the amounts computed by applying the U.S. statutory rate of 35% to pretax income/(loss) for the years ended December 31, 2015 , 2014 , and 2013 as follows (dollars in thousands): Year Ended December 31, 2015 2014 2013 Income tax (benefit)/provision U.S. federal income tax (benefit)/provision $ (4,383 ) $ 28,819 $ (8,493 ) State income tax provision 442 2,678 46 Other items (26 ) (137 ) 246 Conversion of certain TRS entities to REITs — (5,770 ) — Valuation allowance 81 404 (80 ) Total income tax (benefit)/provision $ (3,886 ) $ 25,994 $ (8,281 )

Noncontrolling Interests (Table

Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2015
Noncontrolling Interest [Abstract]
Redeemable noncontrolling interests in the Operating Partnership	The following table sets forth redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the years ended December 31, 2015 and 2014 ( dollars in thousands ): Year Ended December 31, 2015 2014 Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, beginning of year $ 282,480 $ 217,597 Mark-to-market adjustment to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership 102,703 73,954 DownREIT Units issued for real estate, net 563,836 — Conversion of OP Units to Common Stock (3,817 ) (4,372 ) Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership 16,773 5,511 Distributions to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (15,231 ) (10,077 ) Allocation of other comprehensive income/(loss) (308 ) (133 ) Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership, end of year $ 946,436 $ 282,480 The following sets forth net income/(loss) attributable to common stockholders and transfers from redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership for the following periods (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Conversion of OP units to UDR Common Stock 3,817 4,372 1,817 Change in equity from net income/(loss) attributable to common stockholders and conversion of OP units to UDR Common Stock $ 340,478 $ 154,982 $ 42,905

Fair Value of Derivatives and62

Fair Value of Derivatives and Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Estimated fair values	The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of December 31, 2015 and 2014 are summarized as follows (dollars in thousands) : Fair Value at December 31, 2015, Using Total Carrying Amount in Statement of Financial Position at December 31, 2015 Fair Value Estimate at December 31, 2015 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 16,694 $ 16,938 $ — $ — $ 16,938 Derivatives - Interest rate contracts (b) 13 13 — 13 — Total assets $ 16,707 $ 16,951 $ — $ 13 $ 16,938 Derivatives - Interest rate contracts (b) $ 2,112 $ 2,112 $ — $ 2,112 $ — Secured debt instruments - fixed rate: (c) Mortgage notes payable 442,617 448,019 — — 448,019 Fannie Mae credit facilities 514,462 539,050 — — 539,050 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 299,378 299,378 — — 299,378 Unsecured debt instruments (c): Commercial banks 150,000 150,000 — — 150,000 Senior unsecured notes 2,056,223 2,108,687 — — 2,108,687 Total liabilities $ 3,590,829 $ 3,673,283 $ — $ 2,112 $ 3,671,171 Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d) $ 946,436 $ 946,436 $ — $ 946,436 $ — Fair Value at December 31, 2014, Using Total Carrying Amount in Statement of Financial Position at December 31, 2014 Fair Value Estimate at December 31, 2014 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 14,369 $ 14,808 $ — $ — $ 14,808 Derivatives- Interest rate contracts (b) 88 88 — 88 — Total assets $ 14,457 $ 14,896 $ — $ 88 $ 14,808 Derivatives- Interest rate contracts (b) $ 10,368 $ 10,368 $ — $ 10,368 $ — Secured debt instruments- fixed rate: (c) Mortgage notes payable 401,210 415,663 — — 415,663 Fannie Mae credit facilities 568,086 606,623 — — 606,623 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 266,196 266,196 — — 266,196 Unsecured debt instruments: (c) Commercial banks 152,500 152,500 — — 152,500 Senior unsecured notes 2,069,076 2,144,125 — — 2,144,125 Total liabilities $ 3,593,473 $ 3,721,512 $ — $ 10,368 $ 3,711,144 Redeemable noncontrolling interests in the Operating Partnership (d) $ 282,480 $ 282,480 $ — $ 282,480 $ — (a) See Note 2 , Significant Accounting Policies. (b) See Note 13, Derivatives and Hedging Activity. (c)

Derivatives and Hedging Activ63

Derivatives and Hedging Activity (Tables)	12 Months Ended
	Dec. 31, 2015
Derivative [Line Items]
Offsetting Assets [Table Text Block]	The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 ( dollars in thousands ): Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Received December 31, 2015 $ 13 $ — $ 13 $ — $ — $ 13 December 31, 2014 $ 88 $ — $ 88 $ (27 ) $ — $ 61
Offsetting Liabilities [Table Text Block]	Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Posted December 31, 2015 $ 2,112 $ — $ 2,112 $ — $ — $ 2,112 December 31, 2014 $ 10,368 $ — $ 10,368 $ (27 ) $ — $ 10,341
Outstanding interest rate derivatives	As of December 31, 2015 , the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk ( dollars in thousands ): Product Number of Instruments Notional Interest rate swaps 5 $ 315,000 Interest rate caps 2 $ 203,166 Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the Company has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the years ended December 31, 2015 and 2014 , and a gain of $0.3 million for the year ended December 31, 2013 . As of December 31, 2015 , the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 3 $ 133,107
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 ( dollars in thousands ): Asset Derivatives (included in Other assets ) Liability Derivatives (included in Other liabilities ) Fair Value at: Fair Value at: December 31, December 31, December 31, December 31, Derivatives designated as hedging instruments: Interest rate products $ 9 $ 86 $ 2,112 $ 10,368 Derivatives not designated as hedging instruments: Interest rate products $ 4 $ 2 $ — $ —
Effect of Company's derivative financial instruments on Consolidated Statements of Operation	The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Derivatives in Cash Flow Hedging Relationships Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing) Year ended December 31, Year ended December 31, Year ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 Interest rate products $ (6,393 ) $ (8,695 ) $ (469 ) $ (2,251 ) $ (4,834 ) $ (6,851 ) $ (11 ) $ 3 $ —
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations	Gain/(Loss) Recognized in Interest income and other income/(expense), net Year ended December 31, Derivatives Not Designated as Hedging Instruments 2015 2014 2013 Interest rate products $ (23 ) $ (4 ) 271

Commitments and Contingencies64

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Summary of real estate commitments	The following summarizes the Company’s real estate commitments at December 31, 2015 ( dollars in thousands ): Number of Properties Costs Incurred to Date (a) Expected Costs to Complete (unaudited) Average Ownership Stake Wholly-owned — under development 1 $ 124,072 (b) $ 217,928 100 % Wholly-owned — redevelopment 3 11,302 (b) 16,698 100 % Joint ventures: Unconsolidated joint ventures 4 497,350 81,979 (c) Various Participating loan investments 1 90,747 (d) 2,711 (e) 0 % Preferred equity investments 5 136,327 (f) — 48 % Total $ 859,798 $ 319,316
Schedule of future minimum lease payments	Future minimum lease payments as of December 31, 2015 are as follows (dollars in thousands): Ground Leases (a) Office Space 2016 $ 5,444 $ 207 2017 5,444 179 2018 5,444 76 2019 5,444 76 2020 4,486 76 Thereafter 311,858 32 Total $ 338,120 $ 646 (a) For purposes of our ground lease contracts, the Company uses the minimum lease payment, if stated in the agreement. For ground lease agreements where there is a reset provision based on the communities appraised value or consumer price index but does not include a specified minimum lease payment, the Company uses the current rent over the remainder of the lease term.

Reportable Segment (Tables)

Reportable Segment (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations	The following table details rental income and NOI from continuing and discontinued operations for UDR’s reportable segments for the years ended December 31, 2015 , 2014 , and 2013 , and reconciles NOI to Net income/(loss) attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Reportable apartment home segment rental income Same-Store Communities West Region $ 255,346 $ 236,175 $ 214,324 Mid-Atlantic Region 157,158 154,491 150,489 Southeast Region 103,920 98,061 93,479 Northeast Region 86,048 81,500 77,299 Southwest Region 57,670 54,810 52,302 Non-Mature Communities/Other 211,786 180,112 167,743 Total segment and consolidated rental income $ 871,928 $ 805,149 $ 755,636 Reportable apartment home segment NOI Same-Store Communities West Region $ 190,682 $ 171,973 $ 152,108 Mid-Atlantic Region 108,324 107,592 105,300 Southeast Region 69,820 65,053 61,087 Northeast Region 64,539 61,315 57,350 Southwest Region 35,767 33,725 31,925 Non-Mature Communities/Other 144,737 116,663 106,271 Total segment and consolidated NOI 613,869 556,321 514,041 Reconciling items: Joint venture management and other fees 22,710 13,044 12,442 Property management (23,978 ) (22,142 ) (20,780 ) Other operating expenses (9,708 ) (8,271 ) (7,136 ) Real estate depreciation and amortization (374,598 ) (358,154 ) (341,490 ) General and administrative (59,690 ) (47,800 ) (42,238 ) Casualty-related recoveries/(charges), net (2,335 ) (541 ) 12,253 Other depreciation and amortization (6,679 ) (5,775 ) (6,741 ) Income/(loss) from unconsolidated entities 62,329 (7,006 ) (415 ) Interest expense (121,875 ) (130,454 ) (126,083 ) Interest income and other income/(expense), net 1,551 11,837 4,681 Tax benefit/(provision), net 3,886 15,136 7,299 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,647 40,449 Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) (1,530 ) Net (income)/loss attributable to noncontrolling interests (3 ) 3 60 Net income/(loss) attributable to UDR, Inc. $ 340,383 $ 154,334 $ 44,812
Details of assets of UDR's reportable segments	The following table details the assets of UDR’s reportable segments as of December 31, 2015 and 2014 (dollars in thousands) : December 31, December 31, Reportable apartment home segment assets: Same-Store communities: West Region $ 2,371,615 $ 2,336,271 Mid-Atlantic Region 1,423,888 1,440,561 Southeast Region 730,060 727,933 Northeast Region 1,109,354 1,076,656 Southwest Region 450,305 440,587 Non-mature Communities/Other 3,105,054 2,361,251 Total segment assets 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Total segment assets — net book value 6,543,402 5,948,487 Reconciling items: Cash and cash equivalents 6,742 15,224 Restricted cash 20,798 22,340 Notes receivable, net 16,694 14,369 Investment in and advances to unconsolidated joint ventures, net 938,906 718,226 Other assets 137,302 110,082 Total consolidated assets $ 7,663,844 $ 6,828,728

Unaudited Summarized Consolid66

Unaudited Summarized Consolidated Quarterly Financial Data Unaudited Summarized Consolidated Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	Selected consolidated quarterly financial data for the years ended December 31, 2015 and 2014 is summarized in the table below (dollars in thousands, except per share amounts) : Three Months Ended March 31, June 30, September 30, December 31, 2015 Rental income $ 207,047 $ 212,764 $ 217,765 $ 234,352 Income/(loss) from continuing operations 76,417 10,842 13,695 4,528 Net income/(loss) attributable to common stockholders (a) 72,891 85,924 12,361 161,270 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic $ 0.28 $ 0.33 $ 0.05 $ 0.62 Diluted $ 0.28 $ 0.33 $ 0.05 $ 0.61 Weighted average number of shares outstanding Basic 256,834 257,849 259,114 260,830 Diluted 258,662 262,806 261,207 266,108 2014 Rental income (b) $ 194,352 $ 200,959 $ 203,587 $ 206,104 Income/(loss) from continuing operations (5,195 ) 4,359 10,611 6,485 Income/(loss) from discontinued operations, net of tax (87 ) 18 79 — Net income/(loss) attributable to common stockholders (a) 17,430 29,076 39,618 64,486 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic and diluted $ 0.07 $ 0.12 $ 0.16 $ 0.25 Weighted average number of shares outstanding Basic 250,177 250,255 251,655 253,983 Diluted 251,822 252,191 253,732 256,000 (a) Due to the quarterly pro-rata calculation of noncontrolling interest and rounding, the sum of the quarterly per share and/or dollar amounts may not equal the annual totals. (b) Represents rental income from continuing operations, excluding amounts classified as discontinued operations.

Discontinued Operations (UNIT67

Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Summary of income from discontinued operations	The following is a summary of Income/(loss) from discontinued operations, net of tax for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Year Ended December 31, 2015 2014 2013 Rental income $ — $ 147 $ 9,152 Rental expenses — 225 3,511 Property management — 4 252 Real estate depreciation — — 1,958 Interest income and other (income)/expense, net — 21 (62 ) Income/(loss) attributable to disposed properties and assets held for sale — (103 ) 3,493 Net gain/(loss) on the sale of depreciable property — 75 41,919 Impairment charges — — (2,355 ) Income tax benefit/(provision) — 38 885 Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 Income/(loss) from discontinued operations attributable to UDR, Inc. $ — $ 10 $ 42,364
United Dominion Reality L.P.
Entity Information [Line Items]
Summary of income from discontinued operations	The following is a summary of income from discontinued operations for the years ended December 31, 2015, 2014, and 2013 ( dollars in thousands ): Year Ended December 31, 2015 2014 2013 Rental income $ — $ — $ 8,989 Rental expenses — — 3,149 Property management — — 247 Real estate depreciation — — 1,935 Income/(loss) attributable to disposed properties — — 3,658 Net gain/(loss) on the sale of depreciable properties — — 41,518 Income/(loss) from discontinued operations $ — $ — $ 45,176 The following table summarizes the impact of the deconsolidation of the contributed assets on the Consolidated Balance Sheet at December 31, 2015 ( in thousands ): Assets Real estate held for investment $ (628,479 ) Accumulated depreciation 223,363 Real estate held for investment, net (405,116 ) Cash and cash equivalents (140 ) Other assets (1,680 ) Total assets $ (406,936 ) Liabilities Secured debt, net $ (228,390 ) Real estate taxes payable (4,123 ) Accounts payable, accrued expenses, and other liabilities (5,781 ) Total liabilities $ (238,294 )

Real Estate Owned (UNITED DOM68

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Schedule of (loss)/income from discontinued operations	The following is a summary of Income/(loss) from discontinued operations, net of tax for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Year Ended December 31, 2015 2014 2013 Rental income $ — $ 147 $ 9,152 Rental expenses — 225 3,511 Property management — 4 252 Real estate depreciation — — 1,958 Interest income and other (income)/expense, net — 21 (62 ) Income/(loss) attributable to disposed properties and assets held for sale — (103 ) 3,493 Net gain/(loss) on the sale of depreciable property — 75 41,919 Impairment charges — — (2,355 ) Income tax benefit/(provision) — 38 885 Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 Income/(loss) from discontinued operations attributable to UDR, Inc. $ — $ 10 $ 42,364
Summary of carrying amounts for real estate owned (at cost)	The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2015 and 2014 (dollars in thousands): December 31, December 31, 2014 Land $ 1,833,156 $ 1,790,281 Depreciable property — held and used: Land improvements 173,821 189,940 Building, improvements, and furniture, fixtures and equipment 7,046,622 6,225,406 Under development: Land 78,085 24,584 Building, improvements, and furniture, fixtures and equipment 45,987 153,048 Real estate held for disposition: Land 9,963 — Building, improvements, and furniture, fixtures and equipment 2,642 — Real estate owned 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Real estate owned, net $ 6,543,402 $ 5,948,487
United Dominion Reality L.P.
Entity Information [Line Items]
Schedule of (loss)/income from discontinued operations	The following is a summary of income from discontinued operations for the years ended December 31, 2015, 2014, and 2013 ( dollars in thousands ): Year Ended December 31, 2015 2014 2013 Rental income $ — $ — $ 8,989 Rental expenses — — 3,149 Property management — — 247 Real estate depreciation — — 1,935 Income/(loss) attributable to disposed properties — — 3,658 Net gain/(loss) on the sale of depreciable properties — — 41,518 Income/(loss) from discontinued operations $ — $ — $ 45,176 The following table summarizes the impact of the deconsolidation of the contributed assets on the Consolidated Balance Sheet at December 31, 2015 ( in thousands ): Assets Real estate held for investment $ (628,479 ) Accumulated depreciation 223,363 Real estate held for investment, net (405,116 ) Cash and cash equivalents (140 ) Other assets (1,680 ) Total assets $ (406,936 ) Liabilities Secured debt, net $ (228,390 ) Real estate taxes payable (4,123 ) Accounts payable, accrued expenses, and other liabilities (5,781 ) Total liabilities $ (238,294 )
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following table summarizes the allocation of the purchase price ( in thousands ): Land $ 27,749 Buildings 111,878 Intangible assets 2,373 Total assets acquired $ 142,000
Summary of carrying amounts for real estate owned (at cost)	The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2015 and 2014 (dollars in thousands): December 31, December 31, 2014 Land $ 833,300 $ 1,008,014 Depreciable property — held and used: Buildings, improvements, and furniture, fixtures and equipment 2,797,605 3,230,756 Real estate owned 3,630,905 4,238,770 Accumulated depreciation (1,281,258 ) (1,403,303 ) Real estate owned, net $ 2,349,647 $ 2,835,467

Unconsolidated Entities (UNIT69

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Pro Forma Information [Table Text Block]	The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the Company’s results of operations for future periods ( in thousands ): Year Ended December 31, 2015 2014 Pro forma revenues $ 943,421 $ 877,287 Pro forma net income/(loss) attributable to common stockholders $ 319,385 $ 105,875
Summary of investments in unconsolidated joint ventures	The Company recognizes earnings or losses from our investments in unconsolidated joint ventures and partnerships consisting of our proportionate share of the net earnings or losses of the joint ventures and partnerships. In addition, we may earn fees for providing management services to the unconsolidated joint ventures and partnerships. The following table summarizes the Company’s investment in and advances to unconsolidated joint ventures and partnerships, net, which are accounted for under the equity method of accounting as of December 31, 2015 and 2014 (dollars in thousands) : Joint Venture Location of Properties Number of Properties Number of Apartment Homes Investment at UDR’s Ownership Interest December 31, December 31, December 31, December 31, December 31, December 31, Operating and development: UDR/MetLife I Various 4 land parcels — $ 15,894 $ 13,306 17.2 % 15.7 % UDR/MetLife II (a) Various 21 operating communities 4,642 425,230 431,277 50.0 % 50.0 % Other UDR/MetLife Development Joint Ventures 1 operating community; 4 development communities (b); Various 1 land parcels 1,437 171,659 134,939 50.6 % 50.6 % UDR/MetLife Vitruvian Park ® Addison, TX 3 operating communities; 6 land parcels 1,130 73,469 80,302 50.0 % 50.0 % UDR/KFH Washington, D.C. 3 operating communities 660 17,211 21,596 30.0 % 30.0 % Texas (c) Texas — — — (25,901 ) — % 20.0 % Investment in and advances to unconsolidated joint ventures, net, before participating loan investment and preferred equity investment 703,463 655,519 Investment at Income from investments for the years ending December 31, Location Rate Years To Maturity December 31, December 31, 2015 2014 2013 Participating loan investment: Steele Creek Denver, CO 6.5% 1.6 90,747 62,707 $ 5,453 $ 2,350 $ 156 Preferred equity investment: West Coast Development Joint Venture (d) Various 6.5% — 144,696 — $ 3,692 $ — $ — Total investment in and advances to unconsolidated joint ventures, net $ 938,906 $ 718,226 (a) In September 2015, the 717 Olympic community, which is held by the UDR/MetLife II joint venture, experienced extensive water damage due a ruptured water pipe. For the year ended December 31, 2015, the Company recorded losses of $2.5 million , its proportionate share of the total losses incurred. (b) The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes. As of December 31, 2015 , no apartment homes had been completed in Other UDR/MetLife Development Joint Ventures. (c) In January 2015, the eight communities held by the Texas joint venture were sold, generating net proceeds to UDR of $44.2 million . The Company recorded promote and fee income of $10.0 million and a gain of $59.4 million (including $24.2 million of previously deferred gains) in connection with the sale. (d) In May 2015, the Company entered into a joint venture agreement with real estate private equity firm, The Wolff Company (“Wolff”), and agreed to pay $136.3 million for a 48 percent ownership interest in a portfolio of five communities that are currently under construction (the "West Coast Development Joint Venture"). The communities are located in three of the Company’s core, coastal markets: Metro Seattle, Los Angeles and Orange County, CA. UDR earns a 6.5 percent preferred return on its investment through each individual community’s date of stabilization, defined as when a community reaches 80 percent occupancy for ninety consecutive days, while Wolff is allocated all operating income and expense during the pre-stabilization period. Upon stabilization, income and expense will be shared based on each partner’s ownership percentage. The Company will serve as property manager and be paid a management fee during the lease-up phase and subsequent operation of each of the communities. Wolff is the general partner of the joint venture and the developer of the communities. The Company has a fixed price option to acquire Wolff’s remaining interest in each community beginning one year after completion. If the options are exercised for all five communities, the Company’s total price will be $597.4 million . In the event the Company does not exercise its options to purchase at least two communities, Wolff will be entitled to earn a contingent disposition fee equal to 6.5 percent return on its implied equity in the communities not acquired. Wolff is providing certain guaranties and there are construction loans on all five communities. Once completed, the five communities will contain 1,533 homes. The Company has concluded it does not control the joint venture and accounts for it under the equity method of accounting. The Company's recorded equity investment in the West Coast Development Joint Venture at December 31, 2015 of $144.7 million is inclusive of outside basis costs and our accrued but unpaid preferred return. During the year ended December 31, 2015 , the Company earned a preferred return of $5.2 million , offset by its share of the West Coast Development Joint Venture transaction expenses of $1.5 million .
Summarized Income Statement Relating to Unconsolidated Joint Ventures [Table Text Block]	Combined summary financial information relating to all of the unconsolidated joint ventures and partnerships operations (not just our proportionate share), is presented below for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands): As of and For the Year Ended December 31, 2015 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 541 $ 170,062 $ 7,634 $ 22,139 $ 19,338 $ — $ 219,714 Property operating expenses (906 ) (63,516 ) (3,826 ) (11,519 ) (7,733 ) — (87,500 ) Real estate depreciation and amortization (818 ) (46,616 ) (6,897 ) (6,639 ) (14,522 ) — (75,492 ) Operating income/(loss) (1,183 ) 59,930 (3,089 ) 3,981 (2,917 ) — 56,722 Interest expense — (52,037 ) (2,566 ) (4,848 ) (5,539 ) — (64,990 ) Income/(loss) from discontinued operations (20 ) — — — — 184,138 184,118 Net income/(loss) $ (1,203 ) $ 7,893 $ (5,655 ) $ (867 ) $ (8,456 ) $ 184,138 $ 175,850 UDR recorded income (loss) from unconsolidated entities $ (513 ) $ 3,578 $ 6,088 $ (3,711 ) $ (2,537 ) $ 59,424 $ 62,329 Condensed Balance Sheets: Total real estate, net $ 92,915 $ 1,942,630 $ 604,611 $ 273,897 $ 221,704 $ — $ 3,135,757 Cash and cash equivalents 1,202 20,767 5,996 7,185 1,320 10 36,480 Other assets 174 24,914 1,921 2,317 565 — 29,891 Total assets 94,291 1,988,311 612,528 283,399 223,589 10 3,202,128 Amount due to/(from) UDR 2 — 5,929 908 427 — 7,266 Third party debt — 1,122,662 201,114 126,388 164,299 — 1,614,463 Accounts payable and accrued liabilities 395 24,244 62,267 7,137 1,480 — 95,523 Total liabilities 397 1,146,906 269,310 134,433 166,206 — 1,717,252 Total equity $ 93,894 $ 841,405 $ 343,218 $ 148,966 $ 57,383 $ 10 $ 1,484,876 UDR’s investment in and advances to unconsolidated joint ventures $ 15,894 $ 425,230 $ 407,102 $ 73,469 $ 17,211 $ — $ 938,906 As of and For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 727 $ 152,047 $ 1,579 $ 19,376 $ 19,724 $ — $ 193,453 Property operating expenses 618 52,150 1,122 10,711 7,498 — 72,099 Real estate depreciation and amortization 2,130 41,504 3,959 7,380 14,426 — 69,399 Operating income/(loss) (2,021 ) 58,393 (3,502 ) 1,285 (2,200 ) — 51,955 Interest expense — (48,493 ) (94 ) (4,131 ) (5,873 ) — (58,591 ) Income/(loss) from discontinued operations (31,802 ) — — — — (4,229 ) (36,031 ) Net income/(loss) $ (33,823 ) $ 9,900 $ (3,596 ) $ (2,846 ) $ (8,073 ) $ (4,229 ) $ (42,667 ) UDR recorded income/(loss) from unconsolidated entities $ (2,955 ) $ 2,814 $ 576 $ (4,068 ) $ (2,601 ) $ (772 ) $ (7,006 ) Condensed Balance Sheets: Total real estate, net $ 89,482 $ 1,986,237 $ 351,861 $ 278,600 $ 235,623 $ — $ 2,941,803 Assets held for sale 1,978 — — — — 214,218 216,196 Cash and cash equivalents 1,983 15,245 6,239 6,570 2,507 — 32,544 Other assets (a) (146 ) 12,938 1,101 3,248 708 — 17,849 Total assets (a) 93,297 2,014,420 359,201 288,418 238,838 214,218 3,208,392 Amount due to/(from) UDR 107 (444 ) 843 1,960 531 — 2,997 Third party debt (a) — 1,140,458 65,408 122,964 164,789 — 1,493,619 Liabilities held for sale 5,110 — — — — 224,596 229,706 Accounts payable and accrued liabilities (a) 749 17,573 17,851 6,766 1,396 — 44,335 Total liabilities (a) 5,966 1,157,587 84,102 131,690 166,716 224,596 1,770,657 Total equity $ 87,331 $ 856,833 $ 275,099 $ 156,728 $ 72,122 $ (10,378 ) $ 1,437,735 UDR’s investment in and advances to unconsolidated joint ventures $ 13,306 $ 431,277 $ 197,646 $ 80,302 $ 21,596 $ (25,901 ) $ 718,226 (a) The Company elected to early adopt FASB ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs, and ASU 2015-15, Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements , during the fourth quarter of 2015. See Note 2, Significant Accounting Policies , for a complete description of the ASUs and their impact. Under the ASUs, deferred financing costs related to debt are treated as offsets to the debt instead of assets. As a result of adopting the ASUs, the following retrospective changes were made to the above table: For the Year Ended December 31, 2014 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Other assets - as previously reported $ (146 ) $ 19,589 $ 4,203 $ 3,933 $ 1,128 $ — $ 28,707 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Other assets - as presented above $ (146 ) $ 12,938 $ 1,101 $ 3,248 $ 708 $ — $ 17,849 Total assets - as previously reported $ 93,297 $ 2,021,071 $ 362,303 $ 289,103 $ 239,258 $ 214,218 $ 3,219,250 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total assets - as presented above $ 93,297 $ 2,014,420 $ 359,201 $ 288,418 $ 238,838 $ 214,218 $ 3,208,392 Third party debt - as previously reported $ — $ 1,147,109 $ 68,510 $ 123,649 $ 165,209 $ — $ 1,504,477 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Third party debt - as presented above $ — $ 1,140,458 $ 65,408 $ 122,964 $ 164,789 $ — $ 1,493,619 Accounts payable and accrued liabilities - as previously reported $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Deferred financing costs — — — — — — — Accounts payable and accrued liabilities - as presented above $ 749 $ 17,573 $ 17,851 $ 6,766 $ 1,396 $ — $ 44,335 Total liabilities - as previously reported $ 5,966 $ 1,164,238 $ 87,204 $ 132,375 $ 167,136 $ 224,596 $ 1,781,515 Deferred financing costs — (6,651 ) (3,102 ) (685 ) (420 ) — (10,858 ) Total liabilities - as presented above $ 5,966 $ 1,157,587 $ 84,102 $ 131,690 $ 166,716 $ 224,596 $ 1,770,657 For the Year Ended December 31, 2013 UDR/MetLife I UDR/MetLife II Other UDR/MetLife Development Joint Ventures UDR/MetLife Vitruvian Park ® UDR/KFH Texas Total Condensed Statements of Operations: Total revenues $ 691 $ 109,926 $ 5,324 $ 7,680 $ 19,221 $ — $ 142,842 Property operating expenses 621 33,809 3,292 4,633 7,035 — 49,390 Real estate depreciation and amortization 115 30,122 3,564 3,830 14,199 — 51,830 Operating income/(loss) (45 ) 45,995 (1,532 ) (783 ) (2,013 ) — 41,622 Interest expense — (37,055 ) (913 ) (1,886 ) (5,872 ) — (45,726 ) Other income/(expense) — 1 — — — — 1 Income/(loss) from discontinued operations (22,388 ) — — — — (9,584 ) (31,972 ) Net income/(loss) $ (22,433 ) $ 8,941 $ (2,445 ) $ (2,669 ) $ (7,885 ) $ (9,584 ) $ (36,075 ) UDR recorded income/(loss) from unconsolidated entities $ (4,675 ) $ 4,471 $ 6,224 $ (2,851 ) $ (2,366 ) $ (1,218 ) $ (415 )
United Dominion Reality L.P.
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Pro Forma Information [Table Text Block]	The unaudited pro forma information below summarizes the Operating Partnership’s combined results of operations for the years ended December 31, 2015, and 2014 as though the above acquisition was completed on January 1, 2014. The information for the year ended December 31, 2015 includes pro forma results for the portion of the period prior to the acquisition date and actual results from the date of acquisition through the end of the period. The supplemental pro forma operating data is not necessarily indicative of what the actual results of operations would have been assuming the transaction had been completed as set forth above, nor does it purport to represent the Operating Partnership’s results of operations for future periods ( in thousands ): Year Ended December 31, 2015 2014 Pro forma net income/(loss) from unconsolidated entities $ (12,006 ) $ (26,511 ) Pro forma net income/(loss) attributable to OP unitholders $ 205,954 $ 69,716
Summary of investments in unconsolidated joint ventures	The following table summarizes the Operating Partnership’s investment in the DownREIT Partnership as of December 31, 2015 (dollars in thousands) : Entity Location of Properties Number of Properties Number of Apartment Homes Investment at UDR’s Ownership Interest December 31, December 31, December 31, December 31, December 31, December 31, Operating and development: DownREIT Partnership Various 13 operating communities 6,261 $ 166,186 $ — 41.6 % — %
Summarized Income Statement Relating to Unconsolidated Joint Ventures [Table Text Block]	Combined summary financial information relating to all of the DownREIT Partnership’s operations (not just our proportionate share), is presented below for the year ended December 31, 2015 ( dollars in thousands): As of and For the Year Ended December 31, 2015 DownREIT Partnership Condensed Consolidated Statement of Operations: Rental income $ 29,933 Property operating and maintenance (9,991 ) Real estate depreciation and amortization (28,934 ) Operating income/(loss) (8,992 ) Interest expense (3,632 ) Other income/(expense) (3,180 ) Net income/(loss) $ (15,804 ) OP recorded income (loss) from unconsolidated entities $ (4,659 ) Condensed Consolidated Balance Sheet: Total real estate, net $ 1,457,244 Cash and cash equivalents 89 Other assets 37,228 Note receivable from affiliate 126,500 Amount due from UDR 35,293 Total assets 1,656,354 Secured debt, net 524,052 Accounts payable, accrued expenses and other liabilities 25,487 Total liabilities 549,539 Total equity 1,106,815 Total liabilities and equity $ 1,656,354 OP’s investment in and advances to unconsolidated joint ventures $ 166,186

Debt (UNITED DOMINION REALTY,70

Debt (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Secured debt instruments	The following is a summary of our secured and unsecured debt at December 31, 2015 and 2014 ( dollars in thousands): Principal Outstanding For the Year Ended December 31, 2015 Weighted Average Interest Rate Weighted Average Years to Maturity Number of Communities Encumbered December 31, 2015 2014 Secured Debt: Fixed Rate Debt Mortgage notes payable (a) $ 442,617 $ 401,210 4.57 % 4.5 8 Fannie Mae credit facilities (b) 514,462 568,086 5.23 % 3.1 18 Deferred financing costs (4,278 ) (5,583 ) Total fixed rate secured debt, net 952,801 963,713 4.93 % 3.7 26 Variable Rate Debt Mortgage notes payable 31,337 31,337 2.19 % 1.1 1 Tax-exempt secured notes payable (c) 94,700 94,700 0.75 % 7.2 2 Fannie Mae credit facilities (b) 299,378 266,196 1.71 % 4.1 8 Deferred financing costs (1,271 ) (1,625 ) Total variable rate secured debt, net 424,144 390,608 1.53 % 4.5 11 Total Secured Debt, net 1,376,945 1,354,321 3.88 % 4.0 37 Unsecured Debt: Variable Rate Debt Borrowings outstanding under unsecured credit facilities due January 2020 and December 2017, respectively (d) (h) 150,000 152,500 1.19 % 4.1 Borrowings outstanding under unsecured working capital credit facility due January 2019 (e) — — — % 3.0 1.21% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 35,000 35,000 1.21 % 5.1 Fixed Rate Debt 5.25% Medium-Term Notes due January 2015 (net of discounts of $0 and $6, respectively) (f) — 325,169 — % 0.0 5.25% Medium-Term Notes due January 2016 (i) 83,260 83,260 5.25 % 0.0 6.21% Medium-Term Note due July 2016 (j) 12,091 — 6.21 % 0.5 4.25% Medium-Term Notes due June 2018 (net of discounts of $1,037 and $1,465, respectively) (h) 298,963 298,535 4.25 % 2.4 3.70% Medium-Term Notes due October 2020 (net of discounts of $38 and $46, respectively) (h) 299,962 299,954 3.70 % 4.8 1.44% Term Loan Facility due January 2021 and June 2018, respectively (d) (h) 315,000 315,000 1.44 % 5.1 4.63% Medium-Term Notes due January 2022 (net of discounts of $2,164 and $2,523, respectively) (h) 397,836 397,477 4.63 % 6.0 3.75% Medium-Term Notes due July 2024 (net of discounts of $886 and $990, respectively) (h) 299,114 299,010 3.75 % 8.5 8.50% Debentures due September 2024 15,644 15,644 8.50 % 8.7 4.00% Medium-Term Notes due October 2025 (net of discount of $671 and $0, respectively) (g) (h) 299,329 — 4.00 % 9.8 Other 24 27 N/A N/A Deferred financing costs (12,373 ) (10,598 ) N/A N/A Total Unsecured Debt, net 2,193,850 2,210,978 3.64 % 5.7 Total Debt, net $ 3,570,795 $ 3,565,299 3.74 % 5.0
Secured credit facilities	Further information related to these credit facilities is as follows (dollars in thousands) : December 31, December 31, 2014 Borrowings outstanding $ 813,840 $ 834,282 Weighted average borrowings during the period ended 822,521 835,873 Maximum daily borrowings during the period ended 834,003 837,564 Weighted average interest rate during the period ended 4.0 % 4.1 % Weighted average interest rate at the end of the period 3.9 % 4.0 %
Aggregate maturities of secured debt	The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next ten years subsequent to December 31, 2015 are as follows (dollars in thousands): Year Total Fixed Secured Debt Total Variable Secured Debt Total Secured Debt Total Unsecured Debt Total Debt 2016 $ 149,058 $ — $ 149,058 $ 95,053 $ 244,111 2017 179,189 96,337 275,526 — 275,526 2018 73,096 137,969 211,065 300,000 511,065 2019 247,796 67,700 315,496 — 315,496 2020 170,664 — 170,664 450,000 620,664 2021 — — — 350,000 350,000 2022 — — — 400,000 400,000 2023 — 96,409 96,409 — 96,409 2024 — — — 315,644 315,644 2025 127,600 — 127,600 300,000 427,600 Thereafter — 27,000 27,000 — 27,000 Subtotal 947,403 425,415 1,372,818 2,210,697 3,583,515 Non-cash (a) 5,398 (1,271 ) 4,127 (16,847 ) (12,720 ) Total $ 952,801 $ 424,144 $ 1,376,945 $ 2,193,850 $ 3,570,795
United Dominion Reality L.P.
Entity Information [Line Items]
Secured debt instruments	Secured debt consists of the following as of December 31, 2015 and 2014 ( dollars in thousands ): Principal Outstanding For the Year Ended December 31, 2015 December 31, Weighted Average Interest Rate Weighted Average Years to Maturity Number of Communities Encumbered 2015 2014 Fixed Rate Debt Mortgage notes payable $ 30,132 $ 378,371 3.43 % 0.6 1 Fannie Mae credit facilities 250,828 333,828 5.08 % 3.7 8 Deferred financing costs (1,627 ) (3,665 ) Total fixed rate secured debt, net 279,333 708,534 4.90 % 3.3 9 Variable Rate Debt Tax-exempt secured note payable 27,000 27,000 0.76 % 16.2 1 Fannie Mae credit facilities 170,203 192,760 1.90 % 4.7 6 Deferred financing costs (572 ) (810 ) Total variable rate secured debt, net 196,631 218,950 1.74 % 6.3 7 Total secured debt, net $ 475,964 $ 927,484 3.76 % 4.5 16
Secured credit facilities	The following is information related to the credit facilities allocated to the Operating Partnership ( dollars in thousands ): December 31, December 31, 2014 Borrowings outstanding $ 421,031 $ 526,588 Weighted average borrowings during the period ended 425,522 527,592 Maximum daily borrowings during the period ended 431,462 528,659 Weighted average interest rate during the period ended 3.8 % 4.1 % Interest rate at the end of the period 3.8 % 4.0 %
Aggregate maturities of secured debt	The aggregate maturities of the Operating Partnership’s secured debt due during each of the next ten calendar years subsequent to December 31, 2015 are as follows (dollars in thousands): Fixed Variable Mortgage Notes Payable Secured Credit Facilities Tax-Exempt Secured Notes Payable Secured Credit Facilities Total 2016 $ 30,132 $ 385 $ — $ — $ 30,517 2017 — 15,640 — 6,566 22,206 2018 — 48,872 — 96,327 145,199 2019 — 123,095 — — 123,095 2020 — 62,836 — — 62,836 2021 — — — — — 2022 — — — — — 2023 — — — 67,310 67,310 2024 — — — — — 2025 — — — — — Thereafter — — 27,000 — 27,000 Subtotal 30,132 250,828 27,000 170,203 478,163 Non-cash (a) (97 ) (1,530 ) (93 ) (479 ) (2,199 ) Total $ 30,035 $ 249,298 $ 26,907 $ 169,724 $ 475,964

Fair Value of Derivatives and71

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Estimated fair values	The estimated fair values of the Company’s financial instruments either recorded or disclosed on a recurring basis as of December 31, 2015 and 2014 are summarized as follows (dollars in thousands) : Fair Value at December 31, 2015, Using Total Carrying Amount in Statement of Financial Position at December 31, 2015 Fair Value Estimate at December 31, 2015 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 16,694 $ 16,938 $ — $ — $ 16,938 Derivatives - Interest rate contracts (b) 13 13 — 13 — Total assets $ 16,707 $ 16,951 $ — $ 13 $ 16,938 Derivatives - Interest rate contracts (b) $ 2,112 $ 2,112 $ — $ 2,112 $ — Secured debt instruments - fixed rate: (c) Mortgage notes payable 442,617 448,019 — — 448,019 Fannie Mae credit facilities 514,462 539,050 — — 539,050 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 299,378 299,378 — — 299,378 Unsecured debt instruments (c): Commercial banks 150,000 150,000 — — 150,000 Senior unsecured notes 2,056,223 2,108,687 — — 2,108,687 Total liabilities $ 3,590,829 $ 3,673,283 $ — $ 2,112 $ 3,671,171 Redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (d) $ 946,436 $ 946,436 $ — $ 946,436 $ — Fair Value at December 31, 2014, Using Total Carrying Amount in Statement of Financial Position at December 31, 2014 Fair Value Estimate at December 31, 2014 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Notes receivable (a) $ 14,369 $ 14,808 $ — $ — $ 14,808 Derivatives- Interest rate contracts (b) 88 88 — 88 — Total assets $ 14,457 $ 14,896 $ — $ 88 $ 14,808 Derivatives- Interest rate contracts (b) $ 10,368 $ 10,368 $ — $ 10,368 $ — Secured debt instruments- fixed rate: (c) Mortgage notes payable 401,210 415,663 — — 415,663 Fannie Mae credit facilities 568,086 606,623 — — 606,623 Secured debt instruments- variable rate: (c) Mortgage notes payable 31,337 31,337 — — 31,337 Tax-exempt secured notes payable 94,700 94,700 — — 94,700 Fannie Mae credit facilities 266,196 266,196 — — 266,196 Unsecured debt instruments: (c) Commercial banks 152,500 152,500 — — 152,500 Senior unsecured notes 2,069,076 2,144,125 — — 2,144,125 Total liabilities $ 3,593,473 $ 3,721,512 $ — $ 10,368 $ 3,711,144 Redeemable noncontrolling interests in the Operating Partnership (d) $ 282,480 $ 282,480 $ — $ 282,480 $ — (a) See Note 2 , Significant Accounting Policies. (b) See Note 13, Derivatives and Hedging Activity. (c)
United Dominion Reality L.P.
Entity Information [Line Items]
Estimated fair values	The estimated fair values of the Operating Partnership’s financial instruments either recorded or disclosed on a recurring basis as of December 31, 2015 and 2014 are summarized as follows (dollars in thousands) : Fair Value at December 31, 2015, Using Total Carrying Amount in Statement of Financial Position at December 31, 2015 Fair Value Estimate at December 31, 2015 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Derivatives- Interest rate contracts (a) $ 8 $ 8 $ — $ 8 $ — Total assets $ 8 $ 8 $ — $ 8 $ — Secured debt instruments - fixed rate: (b) Mortgage notes payable 30,132 30,308 — — 30,308 Fannie Mae credit facilities 250,828 263,070 — — 263,070 Secured debt instruments - variable rate: (b) Tax-exempt secured notes payable 27,000 27,000 — — 27,000 Fannie Mae credit facilities 170,203 170,203 — — 170,203 Total liabilities $ 478,163 $ 490,581 $ — $ — $ 490,581 Fair Value at December 31, 2014, Using Total Carrying Amount in Statement of Financial Position at December 31, 2014 Fair Value Estimate at December 31, 2014 Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Description: Derivatives - Interest rate contracts (b) $ 39 $ 39 $ — $ 39 $ — Total assets $ 39 $ 39 $ — $ 39 $ — Derivatives- Interest rate contracts (a) $ 918 $ 918 $ — $ 918 $ — Secured debt instruments - fixed rate: (b) Mortgage notes payable 378,371 391,835 — — 391,835 Fannie Mae credit facilities 333,828 355,470 — — 355,470 Secured debt instruments - variable rate: (b) Tax-exempt secured notes payable 27,000 27,000 — — 27,000 Fannie Mae credit facilities 192,760 192,760 — — 192,760 Total liabilities $ 932,877 $ 967,983 $ — $ 918 $ 967,065 (a) See Note 9, Derivatives and Hedging Activity. (b) See Note 6, Secured Debt, Net.

Derivatives and Hedging Activ72

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Offsetting Assets [Table Text Block]	The Company has elected not to offset derivative positions in the consolidated financial statements. The tables below present the effect on its financial position had the Company made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 ( dollars in thousands ): Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Received December 31, 2015 $ 13 $ — $ 13 $ — $ — $ 13 December 31, 2014 $ 88 $ — $ 88 $ (27 ) $ — $ 61
Outstanding interest rate derivatives	As of December 31, 2015 , the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk ( dollars in thousands ): Product Number of Instruments Notional Interest rate swaps 5 $ 315,000 Interest rate caps 2 $ 203,166 Derivatives not designated as hedges are not speculative and are used to manage the Company’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the Company has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a loss of less than $0.1 million for the years ended December 31, 2015 and 2014 , and a gain of $0.3 million for the year ended December 31, 2013 . As of December 31, 2015 , the Company had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 3 $ 133,107
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet	The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 ( dollars in thousands ): Asset Derivatives (included in Other assets ) Liability Derivatives (included in Other liabilities ) Fair Value at: Fair Value at: December 31, December 31, December 31, December 31, Derivatives designated as hedging instruments: Interest rate products $ 9 $ 86 $ 2,112 $ 10,368 Derivatives not designated as hedging instruments: Interest rate products $ 4 $ 2 $ — $ —
Effect of Company's derivative financial instruments on Consolidated Statements of Operation	The tables below present the effect of the Company’s derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Derivatives in Cash Flow Hedging Relationships Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) Gain/(Loss) Recognized in Interest expense (Ineffective Portion and Amount Excluded from Effectiveness Testing) Year ended December 31, Year ended December 31, Year ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 Interest rate products $ (6,393 ) $ (8,695 ) $ (469 ) $ (2,251 ) $ (4,834 ) $ (6,851 ) $ (11 ) $ 3 $ —
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations	Gain/(Loss) Recognized in Interest income and other income/(expense), net Year ended December 31, Derivatives Not Designated as Hedging Instruments 2015 2014 2013 Interest rate products $ (23 ) $ (4 ) 271
Offsetting Liabilities [Table Text Block]	Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Posted December 31, 2015 $ 2,112 $ — $ 2,112 $ — $ — $ 2,112 December 31, 2014 $ 10,368 $ — $ 10,368 $ (27 ) $ — $ 10,341
United Dominion Reality L.P.
Entity Information [Line Items]
Offsetting Assets [Table Text Block]	The General Partner has elected not to offset derivative positions in the consolidated financial statements. The table below presents the effect on the Operating Partnership's financial position had the General Partner made the election to offset its derivative positions as of December 31, 2015 and December 31, 2014 : Offsetting of Derivative Assets Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Assets Presented in the Consolidated Balance Sheets (a) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Received December 31, 2015 $ 8 $ — $ 8 $ — $ — $ 8 December 31, 2014 $ 39 $ — $ 39 $ — $ — $ 39
Outstanding interest rate derivatives	As of December 31, 2015 , the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 1 $ 96,327 Derivatives not designated as hedges are not speculative and are used to manage the Operating Partnership’s exposure to interest rate movements and other identified risks but do not meet the strict hedge accounting requirements of GAAP or the General Partner has elected to not apply hedge accounting. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in losses of less than $0.1 million for the years ended December 31, 2015 , 2014 , and 2013 . As of December 31, 2015 , we had the following outstanding derivatives that were not designated as hedges in qualifying hedging relationships ( dollars in thousands ): Product Number of Instruments Notional Interest rate caps 3 $ 98,932
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet	The table below presents the fair value of the Operating Partnership’s derivative financial instruments as well as their classification on the Consolidated Balance Sheets as of December 31, 2015 and 2014 ( dollars in thousands ): Asset Derivatives (included in Other assets ) Liability Derivatives (Included in Other liabilities ) Fair Value at: Fair Value at: December 31, December 31, December 31, December 31, Derivatives designated as hedging instruments: Interest rate products $ 4 $ 37 $ — $ 918 Derivatives not designated as hedging instruments: Interest rate products $ 4 $ 2 $ — $ —
Effect of Company's derivative financial instruments on Consolidated Statements of Operation	The tables below present the effect of the derivative financial instruments on the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 ( dollars in thousands ): Derivatives in Cash Flow Hedging Relationships Unrealized holding gain/(loss) Recognized in OCI (Effective Portion) Gain/(Loss) Reclassified from Accumulated OCI into Interest expense (Effective Portion) Gain/(Loss) Recognized in Interest expense (ineffective Portion and Amount Excluded from Effectiveness Testing) Year ended December 31, Year ended December 31, Year ended December 31, 2015 2014 2013 2015 2014 2013 2015 2014 2013 Interest rate products $ (82 ) $ (285 ) $(348) $ (1,044 ) $ (2,275 ) $ (3,431 ) $ (11 ) $ — $ —
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations	Derivatives Not Designated as Hedging Instruments Gain/(Loss) Recognized in Interest income and other income/(expense), net Year ended December 31, 2015 2014 2013 Interest rate products $ (23 ) $ (3 ) $ (9 )
Offsetting Liabilities [Table Text Block]	Offsetting of Derivative Liabilities Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Balance Sheets Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b) Gross Amounts Not Offset in the Consolidated Balance Sheets Net Amount Financial Instruments Cash Collateral Posted December 31, 2015 $ — $ — $ — $ — $ — $ — December 31, 2014 $ 918 $ — $ 918 $ — $ — $ 918 (b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Consolidated Balance Sheets” located in this footnote.

Capital Structure (UNITED DOM73

Capital Structure (UNITED DOMINION REALTY, L.P.) Capital Structure (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
United Dominion Reality L.P.
Entity Information [Line Items]
Schedule of OP Unit activity and OP units outstanding	The following table shows OP Units outstanding and OP Unit activity as of and for the years ended December 31, 2015 , 2014 , and 2013 : Class A Limited Partner UDR, Inc. Limited Partners Limited Partner General Partner Total Ending balance at December 31, 2012 1,751,671 7,643,548 174,775,152 110,883 184,281,254 OP Units redeemed for the distribution of real estate to the General partner (a) — — (1,002,556 ) — (1,002,556 ) OP redemptions for UDR stock — (76,295 ) 76,295 — — Ending balance at December 31, 2013 1,751,671 7,567,253 173,848,891 110,883 183,278,698 OP redemptions for UDR stock — (153,451 ) 153,451 — — Ending balance at December 31, 2014 1,751,671 7,413,802 174,002,342 110,883 183,278,698 OP redemptions for UDR stock — (112,174 ) 112,174 — — Ending balance at December 31, 2015 1,751,671 7,301,628 174,114,516 110,883 183,278,698

Income_(Loss) Per Share (UNIT74

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted income/(loss) per share for the periods presented (dollars and shares in thousands, except per share data): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per share: Income/(loss) from continuing operations $ 105,482 $ 16,260 $ 2,340 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,572 — (Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) 48 (Income)/loss from continuing operations attributable to noncontrolling interests (3 ) 3 60 Income/(loss) from continuing operations attributable to UDR, Inc. 340,383 154,324 2,448 Distributions to preferred stockholders - Series E (Convertible) (3,722 ) (3,724 ) (3,724 ) Income/(loss) from continuing operations attributable to common stockholders - basic 336,661 150,600 (1,276 ) Dilutive distributions to preferred stockholders - Series E (Convertible) 3,722 — — Income/(loss) from continuing operations attributable to common stockholders - dilutive $ 340,383 $ 150,600 $ (1,276 ) Income/(loss) from discontinued operations, net of tax $ — $ 10 $ 43,942 (Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership — — (1,578 ) Income/(loss) from discontinued operations attributable to common stockholders $ — $ 10 $ 42,364 Net income/(loss) attributable to common stockholders $ 336,661 $ 150,610 $ 41,088 Denominator for income/(loss) per share - basic and diluted: Weighted average common shares outstanding 259,873 252,707 250,684 Non-vested restricted stock awards (1,204 ) (1,179 ) (715 ) Denominator for income/(loss) per share - basic 258,669 251,528 249,969 Incremental shares issuable from assumed conversion of dilutive preferred stock, stock options and unvested restricted stock 5,083 1,917 — Denominator for income/(loss) per share - diluted 263,752 253,445 249,969 Income/(loss) per weighted average common share - basic: Income/(loss) from continuing operations attributable to common stockholders $ 1.30 $ 0.60 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.30 $ 0.60 $ 0.16 Income/(loss) per weighted average common share - diluted: Income/(loss) from continuing operations attributable to common stockholders $ 1.29 $ 0.59 $ (0.01 ) Income/(loss) from discontinued operations attributable to common stockholders — — 0.17 Net income/(loss) attributable to common stockholders $ 1.29 $ 0.59 $ 0.16
United Dominion Reality L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following table sets forth the computation of basic and diluted income/(loss) per OP Unit for the periods presented ( dollars in thousands, except per OP Unit data ): Year Ended December 31, 2015 2014 2013 Numerator for income/(loss) per OP Unit — basic and diluted: Income/(loss) from continuing operations $ 56,940 $ 33,544 $ 32,766 Gain/(loss) on sale of real estate owned 158,123 63,635 — (Income)/loss from continuing operations attributable to noncontrolling interests (1,762 ) (952 ) (4,114 ) Income/(loss) from continuing operations attributable to OP unitholders $ 213,301 $ 96,227 $ 28,652 Income/(loss) from discontinued operations $ — $ — $ 45,176 (Income)/loss from discontinued operations attributable to noncontrolling interests — — (452 ) Income/(loss) from discontinued operations attributable to OP unitholders $ — $ — $ 44,724 Net income/(loss) $ 215,063 $ 97,179 $ 77,942 Net (income)/loss attributable to noncontrolling interests (1,762 ) (952 ) (4,566 ) Net income/(loss) attributable to OP unitholders $ 213,301 $ 96,227 $ 73,376 Denominator for income/(loss) per OP Unit — basic and diluted: Weighted average OP Units outstanding — basic and diluted 183,279 183,279 184,196 Income/(loss) per weighted average OP Unit — basic and diluted: Income/(loss) from continuing operations attributable to OP unitholders $ 1.16 $ 0.53 $ 0.16 Income/(loss) from discontinued operations attributable to OP unitholders — — 0.24 Net income/(loss) attributable to OP unitholders $ 1.16 $ 0.53 $ 0.40

Commitments and Contingencies75

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Summary of real estate commitments	The following summarizes the Company’s real estate commitments at December 31, 2015 ( dollars in thousands ): Number of Properties Costs Incurred to Date (a) Expected Costs to Complete (unaudited) Average Ownership Stake Wholly-owned — under development 1 $ 124,072 (b) $ 217,928 100 % Wholly-owned — redevelopment 3 11,302 (b) 16,698 100 % Joint ventures: Unconsolidated joint ventures 4 497,350 81,979 (c) Various Participating loan investments 1 90,747 (d) 2,711 (e) 0 % Preferred equity investments 5 136,327 (f) — 48 % Total $ 859,798 $ 319,316

Reportable Segments (UNITED D76

Reportable Segments (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations	The following table details rental income and NOI from continuing and discontinued operations for UDR’s reportable segments for the years ended December 31, 2015 , 2014 , and 2013 , and reconciles NOI to Net income/(loss) attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Reportable apartment home segment rental income Same-Store Communities West Region $ 255,346 $ 236,175 $ 214,324 Mid-Atlantic Region 157,158 154,491 150,489 Southeast Region 103,920 98,061 93,479 Northeast Region 86,048 81,500 77,299 Southwest Region 57,670 54,810 52,302 Non-Mature Communities/Other 211,786 180,112 167,743 Total segment and consolidated rental income $ 871,928 $ 805,149 $ 755,636 Reportable apartment home segment NOI Same-Store Communities West Region $ 190,682 $ 171,973 $ 152,108 Mid-Atlantic Region 108,324 107,592 105,300 Southeast Region 69,820 65,053 61,087 Northeast Region 64,539 61,315 57,350 Southwest Region 35,767 33,725 31,925 Non-Mature Communities/Other 144,737 116,663 106,271 Total segment and consolidated NOI 613,869 556,321 514,041 Reconciling items: Joint venture management and other fees 22,710 13,044 12,442 Property management (23,978 ) (22,142 ) (20,780 ) Other operating expenses (9,708 ) (8,271 ) (7,136 ) Real estate depreciation and amortization (374,598 ) (358,154 ) (341,490 ) General and administrative (59,690 ) (47,800 ) (42,238 ) Casualty-related recoveries/(charges), net (2,335 ) (541 ) 12,253 Other depreciation and amortization (6,679 ) (5,775 ) (6,741 ) Income/(loss) from unconsolidated entities 62,329 (7,006 ) (415 ) Interest expense (121,875 ) (130,454 ) (126,083 ) Interest income and other income/(expense), net 1,551 11,837 4,681 Tax benefit/(provision), net 3,886 15,136 7,299 Gain/(loss) on sale of real estate owned, net of tax 251,677 143,647 40,449 Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership (16,773 ) (5,511 ) (1,530 ) Net (income)/loss attributable to noncontrolling interests (3 ) 3 60 Net income/(loss) attributable to UDR, Inc. $ 340,383 $ 154,334 $ 44,812
Details of assets of UDR's reportable segments	The following table details the assets of UDR’s reportable segments as of December 31, 2015 and 2014 (dollars in thousands) : December 31, December 31, Reportable apartment home segment assets: Same-Store communities: West Region $ 2,371,615 $ 2,336,271 Mid-Atlantic Region 1,423,888 1,440,561 Southeast Region 730,060 727,933 Northeast Region 1,109,354 1,076,656 Southwest Region 450,305 440,587 Non-mature Communities/Other 3,105,054 2,361,251 Total segment assets 9,190,276 8,383,259 Accumulated depreciation (2,646,874 ) (2,434,772 ) Total segment assets — net book value 6,543,402 5,948,487 Reconciling items: Cash and cash equivalents 6,742 15,224 Restricted cash 20,798 22,340 Notes receivable, net 16,694 14,369 Investment in and advances to unconsolidated joint ventures, net 938,906 718,226 Other assets 137,302 110,082 Total consolidated assets $ 7,663,844 $ 6,828,728
United Dominion Reality L.P.
Entity Information [Line Items]
Summary of rental income and NOI for UDRs reportable segments and reconciliation of NOI to loss from continuing operations	The following table details rental income and NOI from continuing and discontinued operations for the Operating Partnership’s reportable segments for the years ended December 31, 2015 , 2014 , and 2013 , and reconciles NOI to Net income/(loss) attributable to OP unitholders in the Consolidated Statements of Operations (dollars in thousands) : Year Ended December 31, 2015 2014 2013 Reportable apartment home segment rental income Same-Store Communities West Region $ 174,414 $ 160,185 $ 150,137 Mid-Atlantic Region 60,602 65,565 64,923 Southeast Region 44,981 42,568 40,730 Northeast Region 59,444 58,788 55,850 Southwest Region 20,963 26,580 25,614 Non-Mature Communities/Other 80,004 68,948 73,588 Total segment and consolidated rental income $ 440,408 $ 422,634 $ 410,842 Reportable apartment home segment NOI Same-Store Communities West Region $ 130,509 $ 117,130 $ 107,866 Mid-Atlantic Region 40,301 44,366 44,442 Southeast Region 30,106 28,111 26,590 Northeast Region 45,917 45,347 42,146 Southwest Region 13,176 16,821 16,057 Non-Mature Communities/Other 57,588 48,538 50,434 Total segment and consolidated NOI 317,597 300,313 287,535 Reconciling items: Property management (12,111 ) (11,622 ) (11,298 ) Other operating expenses (5,923 ) (5,172 ) (5,728 ) Real estate depreciation and amortization (169,784 ) (179,176 ) (181,302 ) General and administrative (27,016 ) (28,541 ) (24,808 ) Casualty-related recoveries/(charges), net (843 ) (541 ) 8,083 Income/(loss) from unconsolidated entities (4,659 ) — — Interest expense (40,321 ) (41,717 ) (36,058 ) Gain/(loss) on sale of real estate owned, net of tax 158,123 63,635 41,518 Net income/(loss) attributable to noncontrolling interests (1,762 ) (952 ) (4,566 ) Net income/(loss) attributable to OP unitholders $ 213,301 $ 96,227 $ 73,376
Details of assets of UDR's reportable segments	The following table details the assets of the Operating Partnership’s reportable segments as of December 31, 2015 and 2014 (dollars in thousands) : December 31, December 31, 2014 Reportable apartment home segment assets Same-Store Communities West Region $ 1,461,078 $ 1,433,827 Mid-Atlantic Region 410,710 686,708 Southeast Region 321,787 316,788 Northeast Region 669,082 777,375 Southwest Region — 228,997 Non-Mature Communities/Other 768,248 795,075 Total segment assets 3,630,905 4,238,770 Accumulated depreciation (1,281,258 ) (1,403,303 ) Total segment assets - net book value 2,349,647 2,835,467 Reconciling items: Cash and cash equivalents 3,103 502 Restricted cash 11,344 13,811 Investment in unconsolidated entities 166,186 — Other assets 24,528 24,029 Total consolidated assets $ 2,554,808 $ 2,873,809

Unaudited Summarized Consolid77

Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2015
Entity Information [Line Items]
Schedule of quarterly financial information	Selected consolidated quarterly financial data for the years ended December 31, 2015 and 2014 is summarized in the table below (dollars in thousands, except per share amounts) : Three Months Ended March 31, June 30, September 30, December 31, 2015 Rental income $ 207,047 $ 212,764 $ 217,765 $ 234,352 Income/(loss) from continuing operations 76,417 10,842 13,695 4,528 Net income/(loss) attributable to common stockholders (a) 72,891 85,924 12,361 161,270 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic $ 0.28 $ 0.33 $ 0.05 $ 0.62 Diluted $ 0.28 $ 0.33 $ 0.05 $ 0.61 Weighted average number of shares outstanding Basic 256,834 257,849 259,114 260,830 Diluted 258,662 262,806 261,207 266,108 2014 Rental income (b) $ 194,352 $ 200,959 $ 203,587 $ 206,104 Income/(loss) from continuing operations (5,195 ) 4,359 10,611 6,485 Income/(loss) from discontinued operations, net of tax (87 ) 18 79 — Net income/(loss) attributable to common stockholders (a) 17,430 29,076 39,618 64,486 Income/(loss) attributable to common stockholders per weighted average common share (a): Basic and diluted $ 0.07 $ 0.12 $ 0.16 $ 0.25 Weighted average number of shares outstanding Basic 250,177 250,255 251,655 253,983 Diluted 251,822 252,191 253,732 256,000 (a) Due to the quarterly pro-rata calculation of noncontrolling interest and rounding, the sum of the quarterly per share and/or dollar amounts may not equal the annual totals. (b) Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
United Dominion Reality L.P.
Entity Information [Line Items]
Schedule of quarterly financial information	Selected consolidated quarterly financial data for the years ended December 31, 2015 and 2014 is summarized in the table blow ( dollars in thousands, except per share amounts ): Three Months Ended March 31, June 30, September 30, December 31, 2015 Rental income $ 110,095 $ 113,158 $ 115,173 $ 101,982 Income/(loss) from continuing operations 12,117 15,355 14,952 14,516 Income/(loss) attributable to OP unitholders 36,346 47,383 14,617 114,955 Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (a) $ 0.20 $ 0.26 $ 0.08 $ 0.62 2014 Rental income $ 102,370 $ 104,842 $ 107,444 $ 107,978 Income/(loss) from continuing operations 6,411 8,319 8,875 9,939 Income/(loss) attributable to OP unitholders 30,533 24,426 8,637 32,631 Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (a) $ 0.17 $ 0.13 $ 0.05 $ 0.18 (a) Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts

Consolidation and Basis of Pr78

Consolidation and Basis of Presentation (Details)	Dec. 31, 2015Communities	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes	Dec. 31, 2015shares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013shares	Dec. 31, 2012shares
Consolidation and Basis of Presentation [Line Items]
Number of Real Estate Properties	133	2
Investment Building and Building Improvements, and Furniture, Fixtures and Equipment | $			$ 7,046,622,000			$ 6,225,406,000
Consolidation And Basis Of Presentation (Textual) [Abstract]
Number of markets operating within | $			18
Number of apartments owned | Apartment_Homes				40,728
Joint venture, number of homes in communities | Apartment_Homes				6,696
Operating Partnership outstanding units					183,278,698	183,278,698
OP units outstanding related to limited partner					183,278,698	183,278,698	183,278,698	184,281,254
General Partner [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
OP units outstanding related to limited partner					174,225,399	174,113,225
Percentage of units outstanding owned by limited partners						95.00%
Limited Partner [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
Percentage of units outstanding owned by limited partners		95.10%
Non-affiliated Partners
Consolidation And Basis Of Presentation (Textual) [Abstract]
OP units outstanding related to limited partner					9,053,299	9,165,473
Percentage of units outstanding owned by limited partners		4.90%				5.00%
UDR Lighthouse DownREIT L.P. [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
Operating Partnership outstanding units					32,367,380
United Dominion Reality L.P. | UDR Lighthouse DownREIT L.P. [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
Operating Partnership outstanding units					13,470,651
Percentage of units outstanding owned by limited partners		41.60%
General Partner [Member] | UDR Lighthouse DownREIT L.P. [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
Operating Partnership outstanding units					16,229,407	0	0
General Partners Capital Account Units Owned Percentage		50.10%
Limited Partner [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
OP units outstanding related to limited partner					7,301,628	7,413,802	7,567,253	7,643,548
Limited Partner [Member] | UDR Lighthouse DownREIT L.P. [Member]
Consolidation And Basis Of Presentation (Textual) [Abstract]
Operating Partnership outstanding units					16,137,973
Percentage of units outstanding owned by limited partners		49.90%

Significant Accounting Polici79

Significant Accounting Policies (Details)		1 Months Ended	3 Months Ended								12 Months Ended
		Oct. 20, 2015	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)$ / shares	Sep. 30, 2014USD ($)$ / shares	Jun. 30, 2014USD ($)$ / shares	Mar. 31, 2014USD ($)$ / shares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)shares
Accounting Policies [Line Items]
Deferred Finance Costs, Net							$ 0					$ 0
Document Period End Date											Dec. 31, 2015
Significant Accounting Policies (Textual) [Abstract]
Development costs excluding direct costs and capitalized interest											$ 6,300,000	9,000,000	$ 11,100,000
Interest capitalized during period											16,100,000	20,200,000	29,400,000
Notes receivable			$ 16,694,000				14,369,000				16,694,000	14,369,000
Number of extension options on loan		2
Extension period of option on loan		6 months
Note maturity public capital threshold											5,000,000
Note receivable interest income											1,500,000	3,400,000	4,100,000
Deferred tax asset			11,762,000				6,976,000				11,762,000	6,976,000	32,273,000
Net of a valuation allowance			81,000				0				81,000	0	1,310,000
Valuation Allowance, Deferred Tax Asset, Change in Amount											100,000
Numerator for earnings per share — basic and diluted:
Net (loss)/income attributable to common stockholders			161,270,000	$ 12,361,000	$ 85,924,000	$ 72,891,000	$ 64,486,000	$ 39,618,000	$ 29,076,000	$ 17,430,000	$ 336,661,000	$ 150,610,000	$ 41,088,000
Weighted average common shares outstanding | shares											259,873,000	252,707,000	250,684,000
Net income/(loss) attributable to common stockholders — basic and diluted (in dollars per share) | $ / shares	[1]						$ 0.25	$ 0.16	$ 0.12	$ 0.07
Advertising expense											$ 6,400,000	$ 6,000,000	$ 5,700,000
Income Tax Expense (Benefit)											(3,886,000)	25,994,000	(8,281,000)
Income Tax Examination, Penalties and Interest Accrued			0								$ 0
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company											0.1
Interest Income, Related Party											$ 0	0	800,000
(Issuance)/repayment of notes receivable											(2,325,000)	68,664,000	$ (19,027,000)
Other Assets			137,302,000				$ 110,082,000				137,302,000	110,082,000
Secured debt, net			1,376,945,000				1,354,321,000				1,376,945,000	1,354,321,000
Unsecured debt, net			$ 2,193,850,000				2,210,978,000				$ 2,193,850,000	2,210,978,000
Note due February 2017
Significant Accounting Policies (Textual) [Abstract]
Notes receivable							11,869,000					11,869,000
Note Receivable Interest Rate			10.00%								10.00%
Aggregate Commitment on Note Receivable			$ 12,994,000								$ 12,994,000
Increase (Decrease) in Notes Receivables											1,100,000
Note maturity public capital threshold											5,000,000
Other
Significant Accounting Policies (Textual) [Abstract]
Notes receivable			$ 2,500,000				2,500,000				$ 2,500,000	2,500,000
Note Receivable Interest Rate			8.00%								8.00%
Note due October 2020 [Member]
Significant Accounting Policies (Textual) [Abstract]
Notes receivable			$ 1,200,000				0				$ 1,200,000	$ 0
Note Receivable Interest Rate			8.00%								8.00%
Aggregate Commitment on Note Receivable			$ 2,000,000								$ 2,000,000
Note maturity public capital threshold											$ 10,000,000
OP Units
Numerator for earnings per share — basic and diluted:
Antidilutive securities | shares											12,947,000	9,247,000	9,337,000
Preferred Stock
Numerator for earnings per share — basic and diluted:
Antidilutive securities | shares											3,032,000	3,036,000	3,036,000
Stock options and unvested restricted stock
Numerator for earnings per share — basic and diluted:
Antidilutive securities | shares											2,051,000	1,917,000	1,584,000
Minimum | Buildings
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											35 years
Minimum | Building improvements
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											10 years
Minimum | Furniture, fixtures, equipment, and other assets
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											3 years
Maximum | Buildings
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											55 years
Maximum | Building improvements
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											35 years
Maximum | Furniture, fixtures, equipment, and other assets
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											10 years
RedeemableNoncontrollingInterest [Member]
Accounting Policies [Line Items]
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest											$ (308,000)	$ (133,000)	$ 250,000
Continuing Operations [Member]
Numerator for earnings per share — basic and diluted:
Income Tax Expense (Benefit)											(3,886,000)	(15,098,000)	(7,299,000)
Discontinued Operations [Member]
Numerator for earnings per share — basic and diluted:
Income Tax Expense (Benefit)											0	5,000	(982,000)
United Dominion Reality L P [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net			2,199,000				4,500,000				$ 2,199,000	4,500,000
Document Period End Date											Dec. 31, 2015
Deferred Tax Liabilities, Net			0								$ 0
Significant Accounting Policies (Textual) [Abstract]
Development costs excluding direct costs and capitalized interest											700,000	2,000,000	2,500,000
Interest capitalized during period											200,000	2,900,000	5,900,000
Numerator for earnings per share — basic and diluted:
Advertising expense											$ 2,400,000	2,500,000	$ 2,500,000
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company											0.10
Other Assets			24,528,000				24,029,000				$ 24,528,000	24,029,000
Secured debt, net			475,964,000				927,484,000				$ 475,964,000	927,484,000
United Dominion Reality L P [Member] | Minimum | Buildings
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											35 years
United Dominion Reality L P [Member] | Minimum | Building improvements
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											10 years
United Dominion Reality L P [Member] | Minimum | Furniture, fixtures, equipment, and other assets
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											3 years
United Dominion Reality L P [Member] | Maximum | Buildings
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											55 years
United Dominion Reality L P [Member] | Maximum | Building improvements
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											35 years
United Dominion Reality L P [Member] | Maximum | Furniture, fixtures, equipment, and other assets
Significant Accounting Policies (Textual) [Abstract]
Estimated useful lives											10 years
Preferred Stock
Numerator for earnings per share — basic and diluted:
Preferred stock, shares redeemed | shares											0
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Significant Accounting Policies (Textual) [Abstract]
Notes receivable			16,694,000				14,369,000				$ 16,694,000	14,369,000
Secured Debt [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net			5,549,000								5,549,000
Unsecured Debt [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net			(12,400,000)								(12,400,000)
Reclassification of Deferred Financing Costs [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net							22,686,000					22,686,000
Other Assets [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net			(7,900,000)				(4,880,000)				(7,900,000)	(4,880,000)
Scenario, Previously Reported [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net							(22,686,000)					(22,686,000)
Numerator for earnings per share — basic and diluted:
Other Assets							105,202,000					105,202,000
Secured debt, net							1,361,529,000					1,361,529,000
Unsecured debt, net							2,221,576,000					2,221,576,000
Scenario, Previously Reported [Member] | United Dominion Reality L P [Member]
Numerator for earnings per share — basic and diluted:
Secured debt, net							931,959,000					931,959,000
Secured Debt [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net							7,208,000					7,208,000
Unsecured Debt [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net			$ 12,373,000				$ 10,598,000				$ 12,373,000	$ 10,598,000
[1]	.

Real Estate Owned (Details)

Real Estate Owned (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Land	$ 1,833,156	$ 1,790,281
Summary of carrying amounts for real estate owned (at cost)
Land Improvements	173,821	189,940
Investment Building and Building Improvements, and Furniture, Fixtures and Equipment	7,046,622	6,225,406
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	124,072	177,632
Sold or held for sale:
Real estate owned	9,190,276	8,383,259
Real Estates Owned Accumulated Depreciation	2,646,874	2,434,772
Accumulated depreciation	(2,646,874)	(2,434,772)	$ (2,208,794)	$ (1,924,682)
Total real estate owned, net of accumulated depreciation	6,543,402	5,948,487
Land
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	78,085	24,584
Sold or held for sale:
Sold or held for sale	9,963	0
Construction in progress
Under development:
Real estate under development (net of accumulated depreciation of $0 and $0, respectively)	45,987	153,048
Building and improvements
Sold or held for sale:
Sold or held for sale	2,642	0
United Dominion Reality L.P.
Property, Plant and Equipment [Line Items]
Land	833,300	1,008,014
Sold or held for sale:
Real estate owned	3,630,905	4,238,770
Accumulated depreciation	(1,281,258)	(1,403,303)	$ (1,241,574)	$ (1,097,133)
Total real estate owned, net of accumulated depreciation	$ 2,349,647	$ 2,835,467

Real Estate Owned Real Estate O

Real Estate Owned Real Estate Owned (Details 1) $ in Thousands	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land	$ 173,924
Business Acquisition Purchase Price Allocation Buildings and Improvements	708,455
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	25,455
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	907,834
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	(96,486)
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Below Market Leases	(542)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(97,028)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 810,806

Real Estate Owned Real Estate82

Real Estate Owned Real Estate Owned (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Acquisition, Pro Forma Revenue	$ 943,421	$ 877,287
Business Acquisition, Pro Forma Net Income (Loss)	$ 319,385	$ 105,875

Real Estate Owned (Details Text

Real Estate Owned (Details Textual) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended								12 Months Ended
	Feb. 19, 2016USD ($)	Dec. 31, 2015USD ($)$ / sharesshares	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)Communities	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015$ / shares	Dec. 31, 2015Communities$ / shares	Dec. 31, 2015$ / shares	Dec. 31, 2015USD ($)$ / shares	Dec. 31, 2015Apartment_Homes$ / shares	Dec. 31, 2015$ / sharesshares	Dec. 31, 2014USD ($)Communitiesshares	Dec. 31, 2013USD ($)CommunitiesApartment_Homesshares	Dec. 31, 2015Communities	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes	Dec. 31, 2015ft²	Dec. 31, 2015States
Real Estate Properties [Line Items]
Revenues													$ 894,638			$ 818,046	$ 758,926
Document Period End Date										Dec. 31, 2015
Real Estate Owned (Textual) [Abstract]
Number of apartment homes owned and consolidated by the Company | Apartment_Homes																					40,728
Communities Sold											12	9
Apartment Homes Sold												2,500		2,735			914
Deferred Gain on Sale of Property						$ 24,700										24,700				$ 6,800
Joint venture, number of homes in communities | Apartment_Homes																					6,696
Number of apartment homes acquired												358
Acquisition-related costs													2,100			400	$ 100
Number of Real Estate Properties																		133	2
Number of States in which Entity Operates																			10
Number of Communities Acquired												4
Other Cost and Expense, Operating													9,708			8,271	7,136
Proceeds from Sale of Property, Plant, and Equipment													408,700			328,400	81,100
Payments for (Proceeds from) Investments													(387,650)			(383,886)	(250,043)
Gain/(loss) on sales of real estate owned, net of tax													251,677			143,572	0
Gain (Loss) on Disposition of Property Plant Equipment													138,600
Noncash or Part Noncash Acquisition, Debt Assumed													0			0	63,595
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		$ 4,528	$ 13,695	$ 10,842	$ 76,417	$ 6,485	$ 10,611	$ 4,359	$ (5,195)				$ 105,482			$ 16,260	2,340
Payments for Delayed Tax Exempt Exchange		221,000
CALIFORNIA
Real Estate Owned (Textual) [Abstract]
Number of Communities Acquired												2
Home Acquisition [Member]
Real Estate Owned (Textual) [Abstract]
Noncash or Part Noncash Acquisition, Debt Assumed		$ 89,300
Number of Properties Purchased		6
Business Combination, Consideration Transferred		$ 900,600
Business Acquisition, Share Price | $ / shares		$ 35								$ 35	$ 35	$ 35	$ 35	$ 35	$ 35
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		16,100,000
Cash Acquired from Acquisition		$ 25,500
Texas JV
Real Estate Owned (Textual) [Abstract]
Communities Sold												8
Deferred Gain on Sale of Property																				24,200
Proceeds from Sale of Property, Plant, and Equipment													$ 44,200
Gain (Loss) on Disposition of Property Plant Equipment													59,400
Operating Community [Member]
Real Estate Owned (Textual) [Abstract]
Communities Sold												1
Gain (Loss) on Disposition of Property Plant Equipment													142,500
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Real Estate Owned (Textual) [Abstract]
Equity method investment, ownership percent						50.00%										50.00%			50.00%
Number of Units in Real Estate Property																			1,130
Number of Real Estate Properties																			3
Operating Community [Member] | Texas JV
Real Estate Owned (Textual) [Abstract]
Equity method investment, ownership percent						20.00%										20.00%			0.00%
Development Community [Member] | Texas JV
Real Estate Owned (Textual) [Abstract]
Number of Units in Real Estate Property																			0
Number of Real Estate Properties																			0
Land
Real Estate Owned (Textual) [Abstract]
Gain (Loss) on Disposition of Property Plant Equipment													1,100
Lightbox [Member]
Real Estate Owned (Textual) [Abstract]
Property, Plant and Equipment, Additions													45,500
Waterscape [Member]
Real Estate Owned (Textual) [Abstract]
Property, Plant and Equipment, Additions													75,200
Graybar [Member]
Real Estate Owned (Textual) [Abstract]
Property, Plant and Equipment, Additions																$ 32,200
Operating Community [Member]
Real Estate Owned (Textual) [Abstract]
Payments for (Proceeds from) Investments													(324,400)
Land
Real Estate Owned (Textual) [Abstract]
Property, Plant and Equipment, Additions													77,800
13th & Market [Member]
Real Estate Owned (Textual) [Abstract]
Equity method investment, ownership percent																			49.00%
Proceeds from Sale of Property, Plant, and Equipment													54,200
Gain (Loss) on Disposition of Property Plant Equipment													7,200
3033 Wilshire
Real Estate Owned (Textual) [Abstract]
Equity method investment, ownership percent																			50.00%
Proceeds from Sale of Property, Plant, and Equipment													8,300
Gain (Loss) on Disposition of Property Plant Equipment													2,200
UDR Lighthouse DownREIT L.P. [Member]
Real Estate Properties [Line Items]
Revenues													15,600
Real Estate Owned (Textual) [Abstract]
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest													9,200
1745 Shea [Member]
Real Estate Owned (Textual) [Abstract]
Noncash or Part Noncash Acquisition, Debt Assumed													24,067			0	0
Square Footage | ft²																						120,000
1745 Shea [Member] | Office Building [Member]
Real Estate Owned (Textual) [Abstract]
Property, Plant and Equipment, Additions													24,000
United Dominion Reality L.P.
Real Estate Properties [Line Items]
Revenues													440,408			$ 422,634	$ 410,842
Document Period End Date										Dec. 31, 2015
Real Estate Owned (Textual) [Abstract]
Number of apartment homes owned and consolidated by the Company | Apartment_Homes																					16,974
Communities Sold												5				1	2
Apartment Homes Sold | Apartment_Homes														1,149			914
Deferred Gain on Sale of Property						$ 24,622										$ 24,622				$ 0
Property, Plant and Equipment, Additions													142,000
Number of apartment homes acquired												421
Number of Real Estate Properties | Communities																		57
Number of States in which Entity Operates | States																							8
Other Cost and Expense, Operating													5,923			5,172	$ 5,728
Proceeds from Sale of Property, Plant, and Equipment													250,900			48,700	81,100
Payments for (Proceeds from) Investments													(232,400)			(47,900)
Gain/(loss) on sales of real estate owned, net of tax													158,123			63,635	0
Gain (Loss) on Disposition of Property Plant Equipment																$ 24,400
Communities Held For Sale | Communities						0										0
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		$ 14,516	$ 14,952	$ 15,355	$ 12,117	$ 9,939	$ 8,875	$ 8,319	$ 6,411				56,940			$ 33,544	$ 32,766
United Dominion Reality L.P. | Home Acquisition [Member]
Real Estate Owned (Textual) [Abstract]
Number of Properties Purchased		1
United Dominion Reality L.P. | Operating Community [Member]
Real Estate Owned (Textual) [Abstract]
Gain (Loss) on Disposition of Property Plant Equipment													62,500
United Dominion Reality L.P. | Land
Real Estate Owned (Textual) [Abstract]
Gain (Loss) on Disposition of Property Plant Equipment													$ 1,100
Affiliated Entity [Member] | Home Acquisition [Member]
Real Estate Owned (Textual) [Abstract]
Number of Properties Purchased		1
Subsequent Event [Member]
Real Estate Owned (Textual) [Abstract]
Proceeds from Sale of Property, Plant, and Equipment	$ 13,500
Payments for (Proceeds from) Investments	(9,600)
Gain (Loss) on Disposition of Property Plant Equipment	$ 2,100
UDR DownREIT Unit [Member] | Home Acquisition [Member]
Real Estate Owned (Textual) [Abstract]
Stock Issued During Period, Value, Acquisitions		$ 564,800
Series F Preferred Stock [Member] | Home Acquisition [Member]
Real Estate Owned (Textual) [Abstract]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		13,988,313													270,628	801,054	533,966
UDR DownREIT Unit [Member]
Real Estate Owned (Textual) [Abstract]
Equity method investment, ownership percent																			50.10%

Discontinued Operations (Detail

Discontinued Operations (Details)	3 Months Ended				12 Months Ended
	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015	Dec. 31, 2015Communities	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)Communities
Gain/(loss) on sales of real estate owned, net of tax								$ 251,677,000		$ 143,572,000	$ 0
Document Period End Date					Dec. 31, 2015
Gain (Loss) on Disposition of Property Plant Equipment								138,600,000
Discontinued Operations (Textual) [Abstract]
Discontinued operations, number of communities sold | Communities						1					2
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax								0		75,000	$ 41,919,000
Proceeds from Sale of Property, Plant, and Equipment								408,700,000		328,400,000	$ 81,100,000
Number of communities sold						12	9
Number of apartment homes sold							2,500		2,735		914
Impairment loss, net of tax								0		0	$ 1,470,000
Summary of income from discontinued operations
Rental income								0		147,000	9,152,000
Rental expenses								0		225,000	3,511,000
Property management fee								0		4,000	252,000
Real estate depreciation								0		0	1,958,000
Interest								0		21,000	(62,000)
Income before net gain on the sale of property								0		(103,000)	3,493,000
Impairment of Long-Lived Assets to be Disposed of								0		0	(2,355,000)
Income tax expense								0		38,000	885,000
Income/(loss) from discontinued operations, net of tax	$ 0	$ 79,000	$ 18,000	$ (87,000)				0		10,000	43,942,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent								0		$ 10,000	$ 42,364,000
Land
Gain (Loss) on Disposition of Property Plant Equipment								1,100,000
Operating Community [Member]
Gain (Loss) on Disposition of Property Plant Equipment								$ 142,500,000
Discontinued Operations (Textual) [Abstract]
Number of communities sold							1

Joint Ventures (Details)

Joint Ventures (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Communities	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2015	Dec. 31, 2015USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	133			2
Investment in and advances to unconsolidated joint ventures, net		$ 718,226			$ 938,906
Deferred Gain on Sale of Property		24,700			6,800
MetLife I
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		13,306			15,894
MetLife I | Operating Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				4
Number of Units in Real Estate Property				0
Investment in and advances to unconsolidated joint ventures, net		$ 13,306			15,894
Equity method investment, ownership percent		15.70%		17.20%
MetLife II
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		$ 431,277			425,230
MetLife II | Operating Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				21
Number of Units in Real Estate Property				4,642
Investment in and advances to unconsolidated joint ventures, net		$ 431,277			425,230
Equity method investment, ownership percent		50.00%		50.00%
Unconsolidated Joint Venture Other MetLife [Member]
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		$ 197,646			407,102
Unconsolidated Joint Venture Other MetLife [Member] | Operating Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				1
Number of Units in Real Estate Property				1,437
Investment in and advances to unconsolidated joint ventures, net		$ 134,939			171,659
Equity method investment, ownership percent		50.60%		50.60%
Unconsolidated Joint Venture Other MetLife [Member] | Development Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				4
Unconsolidated Joint Venture Other MetLife [Member] | Land Parcel
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				1
Unconsolidated Joint Venture Vitruvian Park [Member]
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		$ 80,302			73,469
Unconsolidated Joint Venture Vitruvian Park [Member] | Operating Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				3
Number of Units in Real Estate Property				1,130
Investment in and advances to unconsolidated joint ventures, net		$ 80,302			73,469
Equity method investment, ownership percent		50.00%		50.00%
Unconsolidated Joint Venture Vitruvian Park [Member] | Land Parcel [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				6
KFH
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		$ 21,596			17,211
KFH | Operating Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				3
Number of Units in Real Estate Property				660
Investment in and advances to unconsolidated joint ventures, net		$ 21,596			17,211
Equity method investment, ownership percent		30.00%		30.00%
Texas JV
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		$ (25,901)			0
Deferred Gain on Sale of Property					24,200
Texas JV | Operating Community [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percent		20.00%		0.00%
Texas JV | Development Community [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties				0
Number of Units in Real Estate Property				0
Investment in and advances to unconsolidated joint ventures, net		$ (25,901)			0
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		655,519			703,463
Participating Loan Investment Steele Creek Denver Colorado [Member] | Development Community [Member]
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		62,707			90,747
Participating Loan, Interest Rate, Stated Percentage				6.50%
Participating Loan Years to Maturity	1 year 7 months 6 days
Income from Participating Loan	$ 5,453	2,350	$ 156
Preferred Equity Investment West Coast Development JV [Member] | Development Community [Member]
Schedule of Equity Method Investments [Line Items]
Investment in and advances to unconsolidated joint ventures, net		0			$ 144,696
Participating Loan, Interest Rate, Stated Percentage				6.50%
Participating Loan Years to Maturity	0 months
Income from Participating Loan	$ 3,692	$ 0	$ 0

Joint Ventures (Details 1)

Joint Ventures (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financial information relating to unconsolidated joint ventures operations
Revenues	$ 219,714	$ 193,453	$ 142,842
Real estate depreciation and amortization	(75,492)	69,399	51,830
Net loss	175,850	(42,667)	(36,075)
Income/(loss) from unconsolidated entities	62,329	(7,006)	(415)
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	3,135,757	2,941,803
Total assets	3,202,128	3,208,392
Amount due to UDR	7,266	2,997
Third party debt	1,614,463	1,493,619
Total liabilities	1,717,252	1,770,657
Total equity	1,484,876	1,437,735
Investment in and advances to unconsolidated joint ventures, net	938,906	718,226
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		229,706
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		216,196
Property operating expenses	(87,500)	72,099	49,390
Operating income/(loss)	56,722	51,955	41,622
Interest expense	(64,990)	(58,591)	(45,726)
Other income/(expense)			1
Income/(loss) from discontinued operations	184,118	(36,031)	(31,972)
Cash and cash equivalents	36,480	32,544
Other assets	29,891	17,849
Deferred Finance Costs, Net		0
Accounts payable and accrued liabilities	95,523	44,335
MetLife I
Financial information relating to unconsolidated joint ventures operations
Revenues	541	727	691
Real estate depreciation and amortization	(818)	2,130	115
Net loss	(1,203)	(33,823)	(22,433)
Income/(loss) from unconsolidated entities	(513)	(2,955)	(4,675)
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	92,915	89,482
Total assets	94,291	93,297
Amount due to UDR	2	107
Third party debt	0	0
Total liabilities	397	5,966
Total equity	93,894	87,331
Investment in and advances to unconsolidated joint ventures, net	15,894	13,306
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		5,110
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		1,978
Property operating expenses	(906)	618	621
Operating income/(loss)	(1,183)	(2,021)	(45)
Interest expense	0	0	0
Other income/(expense)			0
Income/(loss) from discontinued operations	(20)	(31,802)	(22,388)
Cash and cash equivalents	1,202	1,983
Other assets	174	(146)
Accounts payable and accrued liabilities	395	749
MetLife II
Financial information relating to unconsolidated joint ventures operations
Revenues	170,062	152,047	109,926
Real estate depreciation and amortization	(46,616)	41,504	30,122
Net loss	7,893	9,900	8,941
Income/(loss) from unconsolidated entities	3,578	2,814	4,471
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	1,942,630	1,986,237
Total assets	1,988,311	2,014,420
Amount due to UDR	0	(444)
Third party debt	1,122,662	1,140,458
Total liabilities	1,146,906	1,157,587
Total equity	841,405	856,833
Investment in and advances to unconsolidated joint ventures, net	425,230	431,277
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		0
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		0
Property operating expenses	(63,516)	52,150	33,809
Operating income/(loss)	59,930	58,393	45,995
Interest expense	(52,037)	(48,493)	(37,055)
Other income/(expense)			1
Income/(loss) from discontinued operations	0	0	0
Cash and cash equivalents	20,767	15,245
Other assets	24,914	12,938
Accounts payable and accrued liabilities	24,244	17,573
Unconsolidated Joint Venture Other MetLife [Member]
Financial information relating to unconsolidated joint ventures operations
Revenues	7,634	1,579	5,324
Real estate depreciation and amortization	(6,897)	3,959	3,564
Net loss	(5,655)	(3,596)	(2,445)
Income/(loss) from unconsolidated entities	6,088	576	6,224
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	604,611	351,861
Total assets	612,528	359,201
Amount due to UDR	5,929	843
Third party debt	201,114	65,408
Total liabilities	269,310	84,102
Total equity	343,218	275,099
Investment in and advances to unconsolidated joint ventures, net	407,102	197,646
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		0
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		0
Property operating expenses	(3,826)	1,122	3,292
Operating income/(loss)	(3,089)	(3,502)	(1,532)
Interest expense	(2,566)	(94)	(913)
Other income/(expense)			0
Income/(loss) from discontinued operations	0	0	0
Cash and cash equivalents	5,996	6,239
Other assets	1,921	1,101
Accounts payable and accrued liabilities	62,267	17,851
Unconsolidated Joint Venture Vitruvian Park [Member]
Financial information relating to unconsolidated joint ventures operations
Revenues	22,139	19,376	7,680
Real estate depreciation and amortization	(6,639)	7,380	3,830
Net loss	(867)	(2,846)	(2,669)
Income/(loss) from unconsolidated entities	(3,711)	(4,068)	(2,851)
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	273,897	278,600
Total assets	283,399	288,418
Amount due to UDR	908	1,960
Third party debt	126,388	122,964
Total liabilities	134,433	131,690
Total equity	148,966	156,728
Investment in and advances to unconsolidated joint ventures, net	73,469	80,302
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		0
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		0
Property operating expenses	(11,519)	10,711	4,633
Operating income/(loss)	3,981	1,285	(783)
Interest expense	(4,848)	(4,131)	(1,886)
Other income/(expense)			0
Income/(loss) from discontinued operations	0	0	0
Cash and cash equivalents	7,185	6,570
Other assets	2,317	3,248
Accounts payable and accrued liabilities	7,137	6,766
Texas JV
Financial information relating to unconsolidated joint ventures operations
Revenues	0	0	0
Real estate depreciation and amortization	0	0	0
Net loss	184,138	(4,229)	(9,584)
Income/(loss) from unconsolidated entities	59,424	(772)	(1,218)
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	0	0
Total assets	10	214,218
Amount due to UDR	0	0
Third party debt	0	0
Total liabilities	0	224,596
Total equity	10	(10,378)
Investment in and advances to unconsolidated joint ventures, net	0	(25,901)
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		224,596
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		214,218
Property operating expenses	0	0	0
Operating income/(loss)	0	0	0
Interest expense	0	0	0
Other income/(expense)			0
Income/(loss) from discontinued operations	184,138	(4,229)	(9,584)
Cash and cash equivalents	10	0
Other assets	0	0
Accounts payable and accrued liabilities	0	0
KFH
Financial information relating to unconsolidated joint ventures operations
Revenues	19,338	19,724	19,221
Real estate depreciation and amortization	(14,522)	14,426	14,199
Net loss	(8,456)	(8,073)	(7,885)
Income/(loss) from unconsolidated entities	(2,537)	(2,601)	(2,366)
Combined summary of balance sheets relating to unconsolidated joint ventures
Real estate, net	221,704	235,623
Total assets	223,589	238,838
Amount due to UDR	427	531
Third party debt	164,299	164,789
Total liabilities	166,206	166,716
Total equity	57,383	72,122
Investment in and advances to unconsolidated joint ventures, net	17,211	21,596
Equity Method of Investment Summarized Financial Information, Liabilities Sold or Held For Sale		0
Equity Method of Investment Summarized Financial Information, Assets Sold or Held For Sale		0
Property operating expenses	(7,733)	7,498	7,035
Operating income/(loss)	(2,917)	(2,200)	(2,013)
Interest expense	(5,539)	(5,873)	(5,872)
Other income/(expense)			0
Income/(loss) from discontinued operations	0	0	$ 0
Cash and cash equivalents	1,320	2,507
Other assets	565	708
Accounts payable and accrued liabilities	1,480	1,396
Unconsolidated Joint Ventures [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Investment in and advances to unconsolidated joint ventures, net	703,463	655,519
Scenario, Previously Reported [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		3,219,250
Third party debt		1,504,477
Total liabilities		1,781,515
Other assets		28,707
Deferred Finance Costs, Net		22,686
Accounts payable and accrued liabilities		44,335
Scenario, Previously Reported [Member] | MetLife I
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		93,297
Third party debt		0
Total liabilities		5,966
Other assets		(146)
Accounts payable and accrued liabilities		749
Scenario, Previously Reported [Member] | MetLife II
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		2,021,071
Third party debt		1,147,109
Total liabilities		1,164,238
Other assets		19,589
Accounts payable and accrued liabilities		17,573
Scenario, Previously Reported [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		362,303
Third party debt		68,510
Total liabilities		87,204
Other assets		4,203
Accounts payable and accrued liabilities		17,851
Scenario, Previously Reported [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		289,103
Third party debt		123,649
Total liabilities		132,375
Other assets		3,933
Accounts payable and accrued liabilities		6,766
Scenario, Previously Reported [Member] | Texas JV
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		214,218
Third party debt		0
Total liabilities		224,596
Other assets		0
Accounts payable and accrued liabilities		0
Scenario, Previously Reported [Member] | KFH
Combined summary of balance sheets relating to unconsolidated joint ventures
Total assets		239,258
Third party debt		165,209
Total liabilities		167,136
Other assets		1,128
Accounts payable and accrued liabilities		1,396
Other Assets [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net	$ 7,900	4,880
Other Assets [Member] | MetLife I
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Other Assets [Member] | MetLife II
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(6,651)
Other Assets [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(3,102)
Other Assets [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(685)
Other Assets [Member] | Texas JV
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Other Assets [Member] | KFH
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(420)
Other Assets [Member] | Unconsolidated Joint Ventures [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(10,858)
Assets, Total [Member] | MetLife I
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Assets, Total [Member] | MetLife II
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(6,651)
Assets, Total [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(3,102)
Assets, Total [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(685)
Assets, Total [Member] | Texas JV
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Assets, Total [Member] | KFH
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(420)
Assets, Total [Member] | Unconsolidated Joint Ventures [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(10,858)
Debt [Member] | MetLife I
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Debt [Member] | MetLife II
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(6,651)
Debt [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(3,102)
Debt [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(685)
Debt [Member] | Texas JV
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Debt [Member] | KFH
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(420)
Debt [Member] | Unconsolidated Joint Ventures [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(10,858)
Accounts Payable and Accrued Liabilities [Member] | MetLife I
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Accounts Payable and Accrued Liabilities [Member] | MetLife II
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Accounts Payable and Accrued Liabilities [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Accounts Payable and Accrued Liabilities [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Accounts Payable and Accrued Liabilities [Member] | Texas JV
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Accounts Payable and Accrued Liabilities [Member] | KFH
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Accounts Payable and Accrued Liabilities [Member] | Unconsolidated Joint Ventures [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Liabilities, Total [Member] | MetLife I
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Liabilities, Total [Member] | MetLife II
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(6,651)
Liabilities, Total [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(3,102)
Liabilities, Total [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(685)
Liabilities, Total [Member] | Texas JV
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		0
Liabilities, Total [Member] | KFH
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		(420)
Liabilities, Total [Member] | Unconsolidated Joint Ventures [Member]
Combined summary of balance sheets relating to unconsolidated joint ventures
Deferred Finance Costs, Net		$ (10,858)

Joint Ventures (Details Textual

Joint Ventures (Details Textual)	1 Months Ended	2 Months Ended	12 Months Ended
	Oct. 20, 2015	Feb. 19, 2016USD ($)	Dec. 31, 2015Communities	Dec. 31, 2015Communities	Dec. 31, 2015Communities	Dec. 31, 2015USD ($)Communities	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes
Schedule of Equity Method Investments [Line Items]
Casualty-related (recoveries)/charges, net						$ (2,335,000)	$ (541,000)	$ 12,253,000
Joint Ventures
Real Estate Investment Property, Net							5,770,855,000			$ 6,407,555,000
Joint venture, number of homes in communities | Apartment_Homes											6,696
Unamortized discount							6,700,000			10,000,000
First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture										244,111,000
Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture										275,526,000
Interest expense incurred during period						121,875,000	130,454,000	126,083,000
Investment in and advances to unconsolidated joint ventures, net							718,226,000			938,906,000
Weighted Average Interest Rate					3.74%
Payments to acquire equity method investments						217,642,000	222,930,000	43,291,000
Document Period End Date			Dec. 31, 2015
Deferred gains on the sale of depreciable property							24,700,000			6,800,000
Communities Sold				12	9
Proceeds from Sale of Property, Plant, and Equipment						408,700,000	328,400,000	81,100,000
Gain (Loss) on Disposition of Property Plant Equipment						138,600,000
Management fees for our involvement in the joint ventures						11,300,000	11,300,000	11,200,000
Real Estate Owned Gross							8,383,259,000			9,190,276,000
Secured debt, net							1,354,321,000			$ 1,376,945,000
SEC Schedule III, Real Estate, Cost of Real Estate Sold						$ 301,920,000	269,681,000	70,687,000
Number of Real Estate Properties			133	133	133	133			2
Number of extension options on loan	2
Extension period of option on loan	6 months
Number of markets operating within										18
Subsequent Event [Member]
Joint Ventures
Proceeds from Sale of Property, Plant, and Equipment		$ 13,500,000
Gain (Loss) on Disposition of Property Plant Equipment		$ 2,100,000
Land
Joint Ventures
Property, Plant and Equipment, Additions						$ 77,800,000
717 Olympic [Member]
Schedule of Equity Method Investments [Line Items]
Casualty-related (recoveries)/charges, net						2,500,000
Unconsolidated Joint Venture Other MetLife [Member]
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							197,646,000			$ 407,102,000
Unconsolidated Joint Venture Vitruvian Park [Member]
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							80,302,000			73,469,000
MetLife I
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							13,306,000			15,894,000
MetLife II
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							431,277,000			425,230,000
KFH
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							21,596,000			17,211,000
Texas JV
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							$ (25,901,000)			0
Deferred gains on the sale of depreciable property										24,200,000
Communities Sold					8
Proceeds from Sale of Property, Plant, and Equipment						44,200,000
Fee Income from the Sale of Real Estate						10,000,000
Gain (Loss) on Disposition of Property Plant Equipment						59,400,000
Unconsolidated Joint Venture Wolff [Member]
Joint Ventures
Initial investment in equity method investment										136,300,000
Equity method investment, ownership percent									4800.00%
Total Fixed Price Option Sales Price						597,400,000
Number of markets operating within									3
Preferred Return Interest Rate					650.00%
Community Threshold, Percent Occupancy Threshold					8000.00%
Community Threshold, Period Above Occupancy Threshold			90 days
Fixed Price Option Period			1 year
Land
Joint Ventures
Gain (Loss) on Disposition of Property Plant Equipment						1,100,000
Land | Unconsolidated Joint Venture Other MetLife [Member]
Joint Ventures
Number of Real Estate Properties									1
Land | MetLife I
Schedule of Equity Method Investments [Line Items]
Number of apartments of development community									0
Operating Community [Member]
Joint Ventures
Communities Sold					1
Gain (Loss) on Disposition of Property Plant Equipment						142,500,000
Operating Community [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Joint Ventures
Number of Units in Real Estate Property									1,437
Equity method investment, ownership percent							50.60%		50.60%
Investment in and advances to unconsolidated joint ventures, net							$ 134,939,000			171,659,000
Number of Real Estate Properties									1
Operating Community [Member] | Unconsolidated Joint Venture Vitruvian Park [Member]
Joint Ventures
Number of Units in Real Estate Property									1,130
Equity method investment, ownership percent							50.00%		50.00%
Investment in and advances to unconsolidated joint ventures, net							$ 80,302,000			73,469,000
Number of Real Estate Properties									3
Operating Community [Member] | MetLife I
Joint Ventures
Number of Units in Real Estate Property									0
Equity method investment, ownership percent							15.70%		17.20%
Investment in and advances to unconsolidated joint ventures, net							$ 13,306,000			15,894,000
Number of Real Estate Properties									4
Operating Community [Member] | MetLife II
Joint Ventures
Number of Units in Real Estate Property									4,642
Equity method investment, ownership percent							50.00%		50.00%
Investment in and advances to unconsolidated joint ventures, net							$ 431,277,000			425,230,000
Number of Real Estate Properties									21
Operating Community [Member] | KFH
Joint Ventures
Number of Units in Real Estate Property									660
Equity method investment, ownership percent							30.00%		30.00%
Investment in and advances to unconsolidated joint ventures, net							$ 21,596,000			17,211,000
Number of Real Estate Properties									3
Operating Community [Member] | Texas JV
Joint Ventures
Equity method investment, ownership percent							20.00%		0.00%
Operating Community [Member] | Unconsolidated Joint Venture Wolff [Member]
Joint Ventures
Number of Units in Real Estate Property									1,533
Number of Real Estate Properties									2
Development Community [Member] | Unconsolidated Joint Venture Other MetLife [Member]
Joint Ventures
Number of Real Estate Properties									4
Development Community [Member] | Texas JV
Joint Ventures
Number of Units in Real Estate Property									0
Investment in and advances to unconsolidated joint ventures, net							$ (25,901,000)			0
Number of Real Estate Properties									0
Development Community [Member] | Participating Loan Investment Steele Creek Denver Colorado [Member]
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							62,707,000			90,747,000
Income from Participating Loan						5,453,000	2,350,000	156,000
Development Community [Member] | Unconsolidated Joint Venture Wolff [Member]
Joint Ventures
Number of Real Estate Properties									5
Development Community [Member] | Preferred Equity Investment West Coast Development JV [Member]
Joint Ventures
Investment in and advances to unconsolidated joint ventures, net							0			$ 144,696,000
Income from Participating Loan						3,692,000	$ 0	$ 0
Equity Method Investment, Preferred Return						5,200,000
Equity Method Investment, Transaction Expenses						1,500,000
Participating Loan Investment Steele Creek Denver Colorado [Member]
Joint Ventures
Number of Real Estate Properties									1
13th & Market [Member]
Joint Ventures
Equity method investment, ownership percent									49.00%
Proceeds from Sale of Property, Plant, and Equipment						54,200,000
Gain (Loss) on Disposition of Property Plant Equipment						7,200,000
3033 Wilshire
Joint Ventures
Equity method investment, ownership percent									50.00%
Proceeds from Sale of Property, Plant, and Equipment						8,300,000
Gain (Loss) on Disposition of Property Plant Equipment						$ 2,200,000

Secured Debt and Unsecured De88

Secured Debt and Unsecured Debt (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Unamortized discount	$ 10,000	$ 6,700
Weighted Average Interest Rate	3.74%
Weighted Average Years to Maturity	5 years 10 days
Deferred Finance Costs, Net		0
Borrowings outstanding	$ 2,300	1,900
Total Unsecured Debt	2,193,850	2,210,978
Total Debt	3,570,795	3,565,299
Fixed Rate Debt
Debt Instrument [Line Items]
Principal outstanding	$ 952,801	963,713
Weighted Average Interest Rate	4.93%
Weighted Average Years to Maturity	3 years 8 months 19 days
Number of Communities Encumbered	26
Variable Rate Debt
Debt Instrument [Line Items]
Principal outstanding	$ 424,144	390,608
Weighted Average Interest Rate	1.53%
Weighted Average Years to Maturity	4 years 6 months 10 days
Number of Communities Encumbered	11
Unsecured Revolving Credit Facility due October Two Thousand Fifteen [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.19%
Weighted Average Years to Maturity	4 years 30 days
Borrowings outstanding	$ 150,000	152,500
Tax Exempt Notes Payable [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	0.75%
Weighted Average Years to Maturity	7 years 2 months 8 days
Number of Communities Encumbered	2
Line of Credit [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	5.23%
Weighted Average Years to Maturity	3 years 20 days
Number of Communities Encumbered	18
Line of Credit [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End	1.71%
Weighted Average Years to Maturity	4 years 19 days
Number of Communities Encumbered	8
Mortgages [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.57%
Weighted Average Years to Maturity	4 years 6 months 3 days
Number of Communities Encumbered	8
Mortgages [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.19%
Weighted Average Years to Maturity	1 year 26 days
Number of Communities Encumbered	1
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member]
Debt Instrument [Line Items]
Unamortized discount	$ 0	6
Weighted Average Interest Rate	0.00%
Weighted Average Years to Maturity	0 years
Senior Unsecured Notes	$ 0	325,169
Four Point Two Five Percentage Medium-Term Notes due June 2018 [Member]
Debt Instrument [Line Items]
Unamortized discount	$ 1,037	1,465
Weighted Average Interest Rate	4.25%
Weighted Average Years to Maturity	2 years 5 months 1 day
Senior Unsecured Notes	$ 298,963	298,535
ThreePointSevenTermNotesDueOctober2020 [Member]
Debt Instrument [Line Items]
Weighted Average Years to Maturity	4 years 9 months 1 day
Senior Unsecured Notes	$ 299,962	299,954
1.44% Term notes due January 2021 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.44%
Weighted Average Years to Maturity	5 years 29 days
Senior Unsecured Notes	$ 315,000	315,000
Three point seven percent medium term note due October 2020 [Member]
Debt Instrument [Line Items]
Unamortized discount	$ 38	46
Weighted Average Interest Rate	3.70%
Secured Debt [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 1,376,945	1,354,321
Weighted Average Interest Rate	3.88%
Weighted Average Years to Maturity	3 years 11 months 19 days
Number of Communities Encumbered	37
Total Debt	$ 1,376,945
Secured Debt [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Total Debt	952,801
Secured Debt [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Total Debt	$ 424,144
Unsecured Debt [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.64%
Weighted Average Years to Maturity	5 years 8 months 8 days
Total Unsecured Debt	$ 2,193,850	2,210,978
Total Debt	2,193,850
Four Point Six Three Percent Term Medium Notes Due January Two Thousand Twenty-Two [Member]
Debt Instrument [Line Items]
Unamortized discount	$ 2,164	2,523
Weighted Average Interest Rate	4.63%
Weighted Average Years to Maturity	6 years 10 days
Senior Unsecured Notes	$ 397,836	397,477
3.75 MTN Due July 2024 [Member]
Debt Instrument [Line Items]
Unamortized discount	$ 938	990
Weighted Average Interest Rate	3.75%
Weighted Average Years to Maturity	8 years 6 months 1 day
Senior Unsecured Notes	$ 299,114	299,010
Eight Point Five Zero Percent, Debentures, Due September 2024 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	8.50%
Weighted Average Years to Maturity	8 years 8 months 15 days
Senior Unsecured Notes	$ 15,644	15,644
4.00% MTN Due October 2025 [Member]
Debt Instrument [Line Items]
Unamortized discount	$ 671	0
Weighted Average Interest Rate	4.00%
Weighted Average Years to Maturity	9 years 9 months 1 day
Senior Unsecured Notes	$ 299,329	0
Others [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes	$ 24	27
Unsecured Working Capital Credit Facility due January 2019 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	0.00%
Weighted Average Years to Maturity	3 years
Borrowings outstanding	$ 0	0
1.21% Term Loan Facility due January 2021 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.21%
Weighted Average Years to Maturity	5 years 29 days
Senior Unsecured Notes	$ 35,000	35,000
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.25%
Weighted Average Years to Maturity	15 days
Senior Unsecured Notes	$ 83,260	83,260
6.21 Medium Term Note, Due January 2016 [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	6.21%
Weighted Average Years to Maturity	6 months 5 days
Senior Unsecured Notes	$ 12,091	0
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Tax Exempt Notes Payable [Member] | Tax Exempt Notes Payable [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Principal outstanding	94,700	94,700
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Line of Credit [Member] | Line of Credit [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Principal outstanding	514,462	568,086
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Line of Credit [Member] | Line of Credit [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Principal outstanding	299,378	266,196
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Mortgages [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Principal outstanding	442,617	401,210
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Mortgages [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Principal outstanding	31,337	31,337
Unsecured Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(12,373)	(10,598)
Secured Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net		(7,208)
Secured Debt [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(1,271)	(1,625)
Secured Debt [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Deferred Finance Costs, Net	$ (4,278)	$ (5,583)

Secured Debt and Unsecured De89

Secured Debt and Unsecured Debt (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Secured credit facilities
Borrowings outstanding	$ 2,300		$ 1,900
Fannie Mae
Secured credit facilities
Borrowings outstanding	813,840		$ 834,282
Weighted average daily borrowings during the period ended	822,521	$ 835,873
Maximum daily borrowings during the period ended	$ 834,003	$ 837,564
Weighted average interest rate during the period ended	4.02%	4.10%
Weighted average interest rate at the end of the period	3.93%		4.00%

Secured Debt and Unsecured De90

Secured Debt and Unsecured Debt (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Borrowings outstanding at end of period	$ 2,300	$ 1,900
Unsecured Commercial Bank Credit Facility
Summary of short-term bank borrowings under unsecured commercial bank credit facility
Total revolving credit facility	2,000,000	900,000
Weighted average daily borrowings during the period ended	353,647	291,761
Maximum daily borrowings during the period ended	$ 541,500	$ 625,000
Weighted average interest rate during the period ended	1.10%	1.20%
Interest rate at the end of the period	1.20%	1.10%

Secured Debt and Unsecured De91

Secured Debt and Unsecured Debt (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Aggregate maturities of debt
2,013	$ 244,111
2,014	275,526
2,015	511,065
2,016	315,496
2,017	620,664
Long-Term Debt, Maturities, Repayments of Principal in Year Six	350,000
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	400,000
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	96,409
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	315,644
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	427,600
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	3,583,515
Debt Instrument, Unamortized Discount (Premium), Net	(12,720)
Total Debt	3,570,795	$ 3,565,299
Secured Debt [Member]
Aggregate maturities of debt
2,013	149,058
2,014	275,526
2,015	211,065
2,016	315,496
2,017	170,664
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	96,409
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	127,600
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	1,372,818
Debt Instrument, Unamortized Discount (Premium), Net	4,127
Total Debt	1,376,945
Secured Debt [Member] | Fixed Rate Debt
Aggregate maturities of debt
2,013	149,058
2,014	179,189
2,015	73,096
2,016	247,796
2,017	170,664
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	127,600
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Long-term Debt, Gross	947,403
Debt Instrument, Unamortized Discount (Premium), Net	5,398
Total Debt	952,801
Secured Debt [Member] | Variable Rate Debt
Aggregate maturities of debt
2,013	0
2,014	96,337
2,015	137,969
2,016	67,700
2,017	0
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	96,409
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	425,415
Debt Instrument, Unamortized Discount (Premium), Net	(1,271)
Total Debt	424,144
Unsecured Debt [Member]
Aggregate maturities of debt
2,013	95,053
2,014	0
2,015	300,000
2,016	0
2,017	450,000
Long-Term Debt, Maturities, Repayments of Principal in Year Six	350,000
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	400,000
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	315,644
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	300,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Long-term Debt, Gross	2,210,697
Debt Instrument, Unamortized Discount (Premium), Net	(16,847)
Total Debt	$ 2,193,850

Secured Debt and Unsecured De92

Secured Debt and Unsecured Debt (Details Textual)	Jun. 27, 2014	Sep. 26, 2013	Oct. 20, 2015	Sep. 30, 2015USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Debt Instrument [Line Items]
Amortization of Financing Costs					$ 7,000,000	$ 7,200,000
Secured Debt (Textual) [Abstract]
Secured debt amount which encumbers real estate owned based upon book value					$ 2,400,000,000
Percentage of secured debt which encumbers real estate owned based upon book value					25.90%
Secured debt amount of real estate owned which is unencumbered					$ 6,800,000,000
Percentage of secured debt of real estate owned which is unencumbered					74.10%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					$ 96,486,000
Unamortized fair market adjustment					$ 10,000,000	6,700,000
Weighted Average Interest Rate					3.74%
Long-term Line of Credit					$ 2,300,000	1,900,000
Number of extension options on loan			2
Extension period of option on loan			6 months
Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 952,801,000	963,713,000
Weighted Average Interest Rate					4.93%
Variable Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 424,144,000	390,608,000
Weighted Average Interest Rate					1.53%
Five Point Two Five Percent, Medium Term Notes, Due January 2015 [Member]
Secured Debt (Textual) [Abstract]
Unamortized fair market adjustment					$ 0	6,000
Weighted Average Interest Rate					0.00%
Senior Notes					$ 0	325,169,000
3.75 MTN Due July 2024 [Member]
Secured Debt (Textual) [Abstract]
Unamortized fair market adjustment					$ 938,000	990,000
Weighted Average Interest Rate					3.75%
Debt Instrument, Maturity Date	Jul. 31, 2024
Senior Notes					$ 299,114,000	299,010,000
Mortgages [Member] | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Debt instrument, maturity date range, start					Jun. 1, 2016
Debt instrument, maturity date range, end					Nov. 1, 2025
Notes payable minimum interest rates range					3.43%
Notes payable maximum interest rates range					6.16%
Weighted Average Interest Rate					4.57%
Mortgages [Member] | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					2.19%
Debt Assumed As Part of Acquisition [Member]
Secured Debt (Textual) [Abstract]
Amortization of Debt Discount (Premium)					$ 5,300,000	5,100,000	$ 5,100,000
Fannie Mae credit facilities | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Debt instrument, maturity date range, start					May 1, 2017
Debt instrument, maturity date range, end					Jul. 1, 2023
Debt, Weighted Average Interest Rate					5.23%
Fannie Mae credit facilities | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Interest rate at the end of the period					1.71%
Tax-exempt secured notes payable | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Debt instrument, maturity date range, start					Aug. 1, 2019
Debt instrument, maturity date range, end					Mar. 20, 2032
Notes payable minimum interest rates range					0.75%
Notes payable maximum interest rates range					0.76%
Unsecured Revolving Credit Facility due October 2015
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					1.19%
Long-term Line of Credit					$ 150,000,000	152,500,000
4.63% Medium-Term Notes due January 2022
Secured Debt (Textual) [Abstract]
Unamortized fair market adjustment					$ 2,164,000	2,523,000
Weighted Average Interest Rate					4.63%
Senior Notes					$ 397,836,000	397,477,000
ThreePointSevenTermNotesDueOctober2020 [Member]
Secured Debt (Textual) [Abstract]
Debt Instrument, Maturity Date		Oct. 1, 2020
Senior Notes					299,962,000	299,954,000
Fannie Mae
Secured Debt (Textual) [Abstract]
Long-term Line of Credit					$ 813,840,000	$ 834,282,000
Interest rate at the end of the period					3.93%	4.00%
Unsecured Debt [Member]
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					3.64%
Line of Credit Facility, Interest Rate Description					95
Line of Credit Facility, Description Range Low					90
Line of Credit Facility, Description Range High					175
Unsecured Working Capital Credit Facility due January 2019 [Member]
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					0.00%
Long-term Line of Credit					$ 0	$ 0
Line of Credit Facility, Interest Rate Description					90
Line of Credit Facility, Description Range Low					85
Line of Credit Facility, Description Range High					155
Revolving Credit Facility [Member]
Secured Debt (Textual) [Abstract]
Line of Credit Facility, Interest Rate Description					90
Line of Credit Facility, Commitment Fee Description					15
Line of Credit Facility, Description Range Low					85
Line of Credit Facility, Description Range High					155
Line of Credit Facility, Commitment Fee Description Range Low					12.5
Line of Credit Facility, Commitment Fee Description Range High					30
4.00% MTN Due October 2025 [Member]
Secured Debt (Textual) [Abstract]
Unamortized fair market adjustment					$ 671,000	0
Portion of Medium Term Note subject to Interest Rate Swaps					200,000,000
Medium-term Notes					$ 300,000,000
Weighted Average Interest Rate					4.00%
Fixed interest rate					4.00%
Debt Instrument, Maturity Date				Oct. 1, 2025
Percentage of Debt Instrument Price					99.77%
Long-term Debt, Weighted Average Interest Rate					4.55%
Senior Notes					$ 299,329,000	0
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					5.25%
Senior Notes					$ 83,260,000	83,260,000
6.21 Medium Term Note, Due January 2016 [Member]
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					6.21%
Senior Notes					$ 12,091,000	0
UDR Bank Credit Facility
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment					$ 2,000,000,000	$ 900,000,000
Interest rate at the end of the period					1.20%	1.10%
UDR Bank Credit Facility | Unsecured Debt [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment					$ 350,000,000
UDR Bank Credit Facility | Revolving Credit Facility [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment					1,100,000,000
Unsecured Working Capital Credit Facility due January 2019 [Member]
Secured Debt (Textual) [Abstract]
Credit facilities with aggregate commitment					$ 30,000,000
Beginning of range of initial term of debt [Member] | Fannie Mae credit facilities
Secured Debt (Textual) [Abstract]
Debt Instrument, Term					7 years
End of range of inital term of debt [Member] | Fannie Mae credit facilities
Secured Debt (Textual) [Abstract]
Debt Instrument, Term					10 years
Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Reported Value Measurement [Member] | Fannie Mae credit facilities | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 514,462,000	$ 568,086,000
Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Reported Value Measurement [Member] | Fannie Mae credit facilities | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					299,378,000	266,196,000
Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Reported Value Measurement [Member] | Mortgages [Member] | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					442,617,000	401,210,000
Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Reported Value Measurement [Member] | Mortgages [Member] | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					31,337,000	31,337,000
United Dominion Reality L.P.
Debt Instrument [Line Items]
Amortization of Financing Costs					1,300,000	1,400,000
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 475,964,000	927,484,000
Weighted Average Interest Rate					3.76%
United Dominion Reality L.P. | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 279,333,000	708,534,000
Weighted Average Interest Rate					4.90%
United Dominion Reality L.P. | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 196,631,000	218,950,000
Weighted Average Interest Rate					1.74%
United Dominion Reality L.P. | Mortgages [Member] | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Notes payable minimum interest rates range					3.43%
Secured Debt Including Debt on Real Estate Held for Sale					$ 30,132,000	378,371,000
Weighted Average Interest Rate					3.43%
United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					5.08%
United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Weighted Average Interest Rate					1.90%
United Dominion Reality L.P. | 4.63% Medium-Term Notes due January 2022
Secured Debt (Textual) [Abstract]
Debt instrument, maturity date range, end				Jan. 1, 2022
United Dominion Reality L.P. | Fannie Mae
Secured Debt (Textual) [Abstract]
Long-term Line of Credit					$ 421,031,000	$ 526,588,000
Interest rate at the end of the period					3.80%	4.00%
United Dominion Reality L.P. | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Reported Value Measurement [Member] | Fannie Mae credit facilities | Fixed Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					$ 250,828,000	$ 333,828,000
United Dominion Reality L.P. | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Reported Value Measurement [Member] | Fannie Mae credit facilities | Variable Rate Debt
Secured Debt (Textual) [Abstract]
Secured Debt Including Debt on Real Estate Held for Sale					170,203,000	$ 192,760,000
Financial Guarantee | United Dominion Reality L.P. | 3.75 MTN Due July 2024 [Member]
Secured Debt (Textual) [Abstract]
Guarantor borrowing capacity				$ 300,000,000
Financial Guarantee | United Dominion Reality L.P. | 4.63% Medium-Term Notes due January 2022
Secured Debt (Textual) [Abstract]
Guarantor borrowing capacity				400,000,000
Financial Guarantee | United Dominion Reality L.P. | 2.90% Term Notes due January 2016
Secured Debt (Textual) [Abstract]
Guarantor borrowing capacity					250,000,000
Financial Guarantee | United Dominion Reality L.P. | 1.68% Term Notes due December 2016
Secured Debt (Textual) [Abstract]
Guarantor borrowing capacity					$ 100,000,000
Financial Guarantee | United Dominion Reality L.P. | 4.00% MTN Due October 2025 [Member]
Secured Debt (Textual) [Abstract]
Guarantor borrowing capacity				$ 300,000,000

Income_(Loss) Per Share (Detail

Income/(Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income/(loss) from discontinued operations attributable to common stockholders														$ 0	$ 0	$ 0.17
Earnings Per Share, Basic		$ 0.62	[1]	$ 0.05	[1]	$ 0.33	[1]	$ 0.28	[1]					$ 1.30	$ 0.60	$ 0.16
Income/(Loss) Continuing Operations Available to Common Stockholders - Dilutive														$ 340,383	$ 150,600	$ (1,276)
Income/(loss) from continuing operations attributable to common stockholders														$ 1.29	$ 0.59	$ (0.01)
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		$ 4,528		$ 13,695		$ 10,842		$ 76,417		$ 6,485	$ 10,611	$ 4,359	$ (5,195)	$ 105,482	$ 16,260	$ 2,340
Gain/(loss) on sales of real estate owned, net of tax														251,677	143,572	0
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest																48
Net Income (Loss) Attributable to Noncontrolling Interest														3	(3)	(60)
Income (Loss) from Continuing Operations Attributable to Parent														340,383	154,324	2,448
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest														(3)	3	60
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest														16,773	5,511	1,530
Dividends, Preferred Stock														(3,722)	(3,724)	(3,724)
Net (loss)/income attributable to common stockholders		$ 161,270		$ 12,361		$ 85,924		$ 72,891		64,486	39,618	29,076	17,430	336,661	150,610	41,088
Net income/(loss)														357,159	159,842	46,282
Income/(loss) from discontinued operations, net of tax										$ 0	$ 79	$ 18	$ (87)	0	10	43,942
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest														0	0	(1,578)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent														$ 0	$ 10	$ 42,364
Weighted Average Number of Shares Issued, Basic														259,873	252,707	250,684
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights														(1,204)	(1,179)
Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units																$ (715)
Weighted Average Number of Shares Outstanding, Basic		260,830		259,114		257,849		256,834		253,983	251,655	250,255	250,177	258,669	251,528	249,969
Net income/(loss) attributable to common stockholders — basic and diluted (in dollars per share)	[1]									$ 0.25	$ 0.16	$ 0.12	$ 0.07
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements														5,083	1,917	0
Weighted average number of common shares outstanding — diluted		266,108		261,207		262,806		258,662		256,000	253,732	252,191	251,822	263,752	253,445	249,969
Income (Loss) from Continuing Operations, Per Basic Share														$ 1.30	$ 0.60	$ (0.01)
Income/(loss) from discontinued operations attributable to common stockholders														0	0	0.17
Earnings Per Share, Diluted		$ 0.61		$ 0.05		$ 0.33		$ 0.28						$ 1.29	$ 0.59	$ 0.16
Income/(Loss) Continuing Operations Available to Common Stockholders - Basic														$ 336,661	$ 150,600	$ (1,276)
Dilutive Securities, Effect on Basic Earnings Per Share, ESOP Convertible Preferred Stock														3,722	0	$ 0
RedeemableNoncontrollingInterest [Member]
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest														$ 16,773	$ 5,511
[1]	.

Income_(Loss) Per Share Incom94

Income/(Loss) Per Share Income/(Loss) Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	0
Partners' Capital Account, Units	183,278,698	183,278,698
OP Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	12,947,000	9,247,000	9,337,000
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,032,000	3,036,000	3,036,000
Stock Compensation Plan [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,051,000	1,917,000	1,584,000
UDR Lighthouse DownREIT L.P. [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Partners' Capital Account, Units	32,367,380
UDR Lighthouse DownREIT L.P. [Member] | General Partner [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Partners' Capital Account, Units	16,229,407	0	0

Stockholders' Equity Stockhol95

Stockholders' Equity Stockholders' Equity (Details) - shares	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares		112,174
Stock Issued During Period, Shares, New Issues		3,439,636
Common Stock
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	0
Series E Preferred Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	0
Common Stock
Shares, Issued	261,844,521	261,844,521	255,114,603	250,749,665	250,139,408
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares		112,174	153,451	76,291
Stock Issued During Period, Shares, New Issues		6,339,636	3,410,433
Common Stock | Series E Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues		7,480
Preferred Stock
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares		0
Preferred Stock | Series F Preferred Stock [Member]
Shares, Issued	16,452,496	16,452,496	2,464,183	2,464,183	2,464,183
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		0	0	0
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares		0	0	0
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares		0	0
Preferred Stock | Series E Preferred Stock [Member]
Shares, Issued	2,796,903	2,796,903	2,803,812	2,803,812	2,803,812
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares		0	0	0
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares		0	0	0
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares		6,909	0
Home Acquisition [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	16,100,000
Home Acquisition [Member] | Series F Preferred Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	13,988,313	270,628	801,054	533,966

Stockholders' Equity (Details T

Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2008
Class of Stock [Line Items]
Shares Issued, Price Per Share	$ 32.29
Proceeds from Issuance of Common Stock	$ 111,000,000
Common stock, shares authorized	350,000,000	350,000,000
Preferred stock, shares authorized	50,000,000	50,000,000
Stock Issued During Period, Shares, New Issues	3,439,636
Common distributions declared per share	$ 1.11	$ 1.0400	$ 0.9400
Preferred stock, par or state value per share	$ 0	0
Stock issued during period, shares, Distribution Reinvestment and Stock Purchase Plan				9,957,233
Shares reserved for issuance under the Stock Purchase Plan	10,963,730
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	112,174
Equity Distribution Agreement [Member]
Class of Stock [Line Items]
Common stock, shares authorized	20,000,000
Common Stock, Capital Shares Reserved for Future Issuance	13,078,931
Series E Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, liquidation preference per share	$ 16.61
Number of common stock shares to which each preferred share is convertible after special dividend	1.083
Declared preferred stock dividend	$ 1.33	$ 1.33	$ 1.33
Preferred stock, shares outstanding	2,796,903	2,803,812
Series F Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized	20,000,000
Preferred stock, shares outstanding	16,452,496	2,464,183
Preferred stock, par or state value per share	$ 0.0001
Preferred stock, value, issued	$ 1,645	$ 246
Restricted Stock [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	551,293
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	14,691
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period Net of Forfeitures	551,293
Preferred Stock | Series E Preferred Stock [Member]
Class of Stock [Line Items]
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	0	0	0
Preferred Stock | Series F Preferred Stock [Member]
Class of Stock [Line Items]
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	0	0	0
Common Stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	6,339,636	3,410,433
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	112,174	153,451	76,291
Common Stock | Series E Preferred Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	7,480
Common Stock | Sales [Member]
Class of Stock [Line Items]
Shares Issued, Price Per Share	$ 35
Proceeds from Issuance of Common Stock	$ 101,500,000
Common Stock | Common Stock
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues	2,900,000

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Options Outstanding, Number of Options
Balance, December 31, 2011	2,265,842
Granted	0
Balance, December 31, 2012	2,234,963	2,265,842
Options Outstanding, Weighted Average Exercise Price
Balance, December 31, 2011 (in dollars per share)	$ 12.82
Granted (in dollars per share)	0
Exercised (in dollars per share)	25.10
Forfeited (in dollars per share)	0
Balance, December 31, 2012 (in dollars per share)	$ 12.65	$ 12.82
Options Exercisable, Number of Options
Number of Options	2,234,963	2,265,842
Options Exercisable, Weighted Average Exercise Price
Weighted Average Exercise Price (in dollars per share)	$ 12.65	$ 12.82
Restricted Stock, Number Of shares
Vested	0
Restricted Stock, Weighted Average Fair Value Per Restricted Stock
Vested (in dollars per share)	$ 0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 3,000,000
Options Outstanding, Number of Options
Exercised	0
Options Outstanding, Weighted Average Exercise Price
Exercised (in dollars per share)	$ 0
Restricted Stock, Number Of shares
Balance, December 31, 2011	999,978
Granted	551,293
Vested	(736,204)
Forfeited	(14,691)
Balance, December 31, 2012	800,376	999,978
Restricted Stock, Weighted Average Fair Value Per Restricted Stock
Balance, December 31, 2011 (in dollars per share)	$ 23.98
Granted (in dollars per share)	32.67
Vested (in dollars per share)	23.52
Forfeited (in dollars per share)	23.24
Balance, December 31, 2012 (in dollars per share)	$ 30.40	$ 23.98
Outstanding [Member]
Options Outstanding, Number of Options
Exercised	(30,879)
Exercisable [Member]
Options Outstanding, Number of Options
Exercised	30,879

Employee Benefit Plans (Detai98

Employee Benefit Plans (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Issued	5,083,498
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	2,234,963	2,265,842
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 300,000
Number of share options exercisable	2,234,963	2,265,842
Range One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share options exercisable	1,830,672
Share options exercise price, lower range limit	$ 10.06
Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share options exercisable	404,291
Share options exercise price, lower range limit	$ 24.38
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total remaining compensation cost related to unvested share options	$ 0
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total remaining compensation cost related to unvested share options	$ 3,000,000
Weighted average remaining contractual life	1 year 7 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 32.67
Stock based compensation expense	$ 3,200,000	$ 4,200,000	$ 3,600,000
Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total remaining compensation cost related to unvested share options	$ 8,300,000
Weighted average remaining contractual life	11 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 21.15	$ 21.97
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		23.80%	15.80%
Stock based compensation expense	$ 14,800,000	$ 9,800,000	$ 5,900,000
2015 LTIP [Member] | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 34.14
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	16.50%
Transition LTI [Member] | Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 33.68
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	16.60%
Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance under plan	19,000,000
Shares available for issuance under plan	9,530,769
Profit Sharing Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate provisions for contributions	$ 1,100,000	$ 900,000	$ 900,000

Income Taxes (Details)

Income Taxes (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Taxable Distributions Paid Per Common Share [Abstract]
Ordinary income	$ 0.595	$ 0.695	$ 0.744
Taxable Distributions Paid Per Common Share Qualified Ordinary Income	0	0.139	0
Long-term capital gain	0.329	0.105	0.114
Unrecapture section 1250 gain	0.168	0.076	0.067
Taxable distributions per common share	$ 1.092	$ 1.015	$ 0.925

Income Taxes (Details 1)

Income Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal	$ 29	$ 147	$ (1,030)
State	871	550	846
Total current	900	697	(184)
Deferred
Federal	(4,173)	20,138	(6,907)
State	(613)	5,159	(1,190)
Total deferred	(4,786)	25,297	(8,097)
Total income tax expense/(benefit)	(3,886)	25,994	(8,281)
Continuing Operations [Member]
Deferred
Total income tax expense/(benefit)	(3,886)	(15,098)	(7,299)
Tax Benefit of Taxable Subsidiary			(7,299)
Sale of Real Estate [Member]
Deferred
Total income tax expense/(benefit)	0	41,087	0
Discontinued Operations [Member]
Deferred
Total income tax expense/(benefit)	$ 0	$ 5	$ (982)

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Federal and state tax attributes	$ 2,227	$ 0	$ 13,069
Book/tax depreciation	9,016	6,692	19,354
Construction capitalization differences	0	75	0
Debt and interest deductions	0	0	10,311
Other	707	401	0
Total deferred tax assets	11,950	7,168	42,734
Valuation allowance	(81)	0	(1,310)
Net deferred tax assets	11,869	7,168	41,424
Deferred Tax Liabilities, Deferred Expense, Other Capitalized Costs	0	0	(3,766)
Deferred Tax Liabilities, Investment in Noncontrolled Affiliates	0	0	(5,080)
Deferred tax liabilities:
Other	(107)	(192)	(305)
Total deferred tax liabilities	(107)	(192)	(9,151)
Net deferred tax asset	$ 11,762	$ 6,976	$ 32,273

Income Taxes (Details 3)

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Income tax expense/(benefit)
U.S. federal income tax expense/(benefit)	$ (4,383)	$ 28,819	$ (8,493)
State income tax provision	442	2,678	46
Other items	(26)	(137)	246
Income Tax (benefit)/expense, Conversion of certain TRS entities to REITs	0	(5,770)	0
Valuation allowance	81	404	(80)
Total income tax expense/(benefit)	(3,886)	25,994	$ (8,281)
Unrecognized Tax Benefits	$ 0	$ 0

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Valuation allowance	$ 81,000	$ 0	$ 1,310,000
Change in valuation allowance of deferred tax assets	100,000
Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations, Extraordinary Items, Change	(11,200,000)
Income Tax (benefit)/expense, Conversion of certain TRS entities to REITs	0	5,770,000	$ 0
Income Tax expense from the Gain on the Sale of Real Estate	0	41,100,000
Unrecognized Tax Benefits	0	$ 0
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net loss carryforwards	27,100,000
2020 through 2030 | State
Operating Loss Carryforwards [Line Items]
Net loss carryforwards	64,700,000
Prior to conversion [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance	100,000
UDR, Inc. | Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net loss carryforwards	$ 5,700,000
Taxable REIT Subsidiaries
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	0.00%
Taxable REIT Subsidiaries | 2020 through 2030 | State
Operating Loss Carryforwards [Line Items]
Net loss carryforwards	$ 4,200,000

Noncontrolling Interests (Detai

Noncontrolling Interests (Details) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interest									$ 3	$ (3)	$ (60)
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	$ 946,436				$ 282,480				946,436	282,480	217,597
Net (loss)/income attributable to common stockholders	161,270	$ 12,361	$ 85,924	$ 72,891	64,486	$ 39,618	$ 29,076	$ 17,430	$ 336,661	150,610	41,088
Number of Apartment Homes Acquired									358
Change in equity from net loss income attributable to common stockholders and conversion of operating partnership units to companys common stock									$ 340,478	154,982	42,905
Number of Communities Acquired									4
Redeemable noncontrolling interests in the Operating Partnership
Beginning redeemable non-controlling interests in the Operating Partnership				$ 282,480					$ 282,480
Mark to market adjustment to redeemable non-controlling interests in the Operating Partnership									$ 102,703	$ 73,954	3,656
Stock Issued During Period, Shares, Acquisitions | shares									563,836	0
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership									$ (3,817)	$ (4,372)	(1,817)
Net income attributable to redeemable non-controlling interests in the Operating Partnership									16,773	5,511	1,530
Distributions to redeemable non-controlling interests in the Operating Partnership									15,231	10,077
Ending redeemable non-controlling interests in the Operating Partnership	$ 946,436				$ 282,480				946,436	282,480
Net income/(loss) attributable to non-controlling interests									$ 3	(3)	(60)
UDR DownREIT Unit [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	50.10%								50.10%
Noncontrolling Interest
Redeemable noncontrolling interests in the Operating Partnership
Net income/(loss) attributable to non-controlling interests									$ 3	(3)	(60)
RedeemableNoncontrollingInterest [Member]
Redeemable noncontrolling interests in the Operating Partnership
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest									$ (308)	$ (133)	$ 250
UDR, Inc. | UDR DownREIT Unit [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	8.50%								8.50%
United Dominion Reality L.P. | UDR DownREIT Unit [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	41.60%								41.60%

Fair Value of Derivatives an105

Fair Value of Derivatives and Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Net	$ 16,694	$ 14,369
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset	13	88
Derivative Liability	2,112	10,368
Secured debt instruments - variable rate
Long-term Line of Credit	2,300	1,900
Unsecured debt instruments
Redeemable Noncontrolling Interest, Equity, Carrying Amount	946,436	282,480
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	946,436	282,480	$ 217,597
Carrying Amount | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, Net	16,694	14,369
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	16,707	14,457
Unsecured debt instruments
Total liabilities	3,590,829	3,593,473
Carrying Amount | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Liability		10,368
Carrying Amount | Senior unsecured notes | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	2,056,223	2,069,076
Fair Value | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable	16,938	14,808
Total assets	16,951	14,896
Unsecured debt instruments
Total liabilities	3,673,283	3,721,512
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	946,436	282,480
Fair Value | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	13	88
Derivatives - Interest rate contracts	2,112	10,368
Fair Value | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	448,019	415,663
Secured debt instruments - variable rate
Secured debt instruments - variable rate	31,337	31,337
Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700	94,700
Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	539,050	606,623
Secured debt instruments - variable rate
Secured debt instruments - variable rate	299,378	266,196
Unsecured debt instruments
Unsecured debt instruments	150,000	152,500
Fair Value | Senior unsecured notes | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	2,108,687	2,144,125
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable	0	0
Total assets	0	0
Unsecured debt instruments
Total liabilities	0	0
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	0	0
Derivatives - Interest rate contracts	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Commercial bank | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Senior unsecured notes | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable	0	0
Total assets	13	88
Unsecured debt instruments
Total liabilities	2,112	10,368
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	946,436	282,480
Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	13	88
Derivatives - Interest rate contracts	2,112	10,368
Fair Value | Significant Other Observable Inputs (Level 2) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Commercial bank | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Senior unsecured notes | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	0	0
Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Notes receivable	16,938	14,808
Total assets	16,938	14,808
Unsecured debt instruments
Total liabilities	3,671,171	3,711,144
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	0	0
Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset Designated as Hedging Instrument, Fair Value	0	0
Derivatives - Interest rate contracts	0	0
Fair Value | Significant Unobservable Inputs (Level 3) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	448,019	415,663
Secured debt instruments - variable rate
Secured debt instruments - variable rate	31,337	31,337
Fair Value | Significant Unobservable Inputs (Level 3) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700	94,700
Fair Value | Significant Unobservable Inputs (Level 3) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	539,050	606,623
Secured debt instruments - variable rate
Secured debt instruments - variable rate	299,378	266,196
Fair Value | Significant Unobservable Inputs (Level 3) | Commercial bank | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	150,000	152,500
Fair Value | Significant Unobservable Inputs (Level 3) | Senior unsecured notes | Fair Value, Measurements, Recurring
Unsecured debt instruments
Unsecured debt instruments	2,108,687	2,144,125
Fixed Rate Debt
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	952,801	963,713
Variable Rate Debt
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	424,144	390,608
Unsecured Revolving Credit Facility due October 2015
Secured debt instruments - variable rate
Long-term Line of Credit	150,000	152,500
Tax-exempt secured notes payable | Variable Rate Debt | Carrying Amount | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	94,700	94,700
Fannie Mae credit facilities | Fixed Rate Debt | Carrying Amount | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	514,462	568,086
Fannie Mae credit facilities | Variable Rate Debt | Carrying Amount | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	299,378	266,196
Mortgages [Member] | Fixed Rate Debt | Carrying Amount | Mortgages [Member] | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	442,617	401,210
Mortgages [Member] | Variable Rate Debt | Carrying Amount | Mortgages [Member] | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Secured Debt Including Debt on Real Estate Held for Sale	$ 31,337	$ 31,337

Derivatives and Hedging Acti106

Derivatives and Hedging Activity (Details) $ in Thousands	Dec. 31, 2015USD ($)instruments
Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Number of Instruments	5
Derivative, Notional Amount	$ 315,000
Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments	2
Derivative, Notional Amount	$ 203,166
Not Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments | instruments	3
Derivative, Notional Amount	$ 133,107

Derivatives and Hedging Acti107

Derivatives and Hedging Activity (Details 1) - Interest rate products - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Other assets | Designated as Hedging Instrument
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Asset Designated as Hedging Instrument, Fair Value	$ 9	$ 86
Other assets | Not Designated as Hedging Instrument
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Asset Not Designated as Hedging Instrument, Fair Value	4	2
Other liabilities | Designated as Hedging Instrument
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Liability Designated as Hedging Instrument, Fair Value	2,112	10,368
Other liabilities | Not Designated as Hedging Instrument
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet
Derivative Liability Not Designated as Hedging Instrument, Fair Value	$ 0	$ 0

Derivatives and Hedging Acti108

Derivatives and Hedging Activity (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effect of derivative instruments on the Consolidated Statements of Operations
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total	$ (6,393)	$ (8,695)	$ (469)
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	(23)	(4)	271
Interest rate products | Cash Flow Hedging
Effect of derivative instruments on the Consolidated Statements of Operations
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total			(469)
Interest rate products | Interest expense | Cash Flow Hedging
Effect of derivative instruments on the Consolidated Statements of Operations
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	2,251	4,834	6,851
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	$ (11)	$ 3	$ 0

Derivatives and Hedging Acti109

Derivatives and Hedging Activity (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	$ 0	$ 0
Derivatives And Hedging Activity (Textual) [Abstract]
Cash flow hedge ineffectiveness in earnings materiality	0
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense	$ 3,000
Derivative instruments not designated as hedging instruments, gain (loss), net	(23)	(4)	$ 271
Payment required to pay for contract termination	2,200
Interest expense | Cash Flow Hedging | Interest rate products
Derivatives And Hedging Activity (Textual) [Abstract]
Reclassified loss from Other Comprehensive Income/(Loss) to earnings	$ 11	$ (3)	$ 0

Commitments and Contingencie110

Commitments and Contingencies (Details) - Dec. 31, 2015 $ in Thousands		Communities	Total	USD ($)
Long-term Purchase Commitment [Line Items]
Number of Properties		133	2
Costs Incurred to Date				$ 859,798
Expected Costs to Complete	[1]			319,316
Wholly-owned — under development
Long-term Purchase Commitment [Line Items]
Number of Properties			1
Costs Incurred to Date				124,072
Purchase Commitment, Remaining Minimum Amount Committed				217,928
Average Ownership Stake			100.00%
Wholly-owned — redevelopment
Long-term Purchase Commitment [Line Items]
Number of Properties			3
Costs Incurred to Date				11,302
Purchase Commitment, Remaining Minimum Amount Committed				16,698
Average Ownership Stake			100.00%
Unconsolidated joint ventures
Long-term Purchase Commitment [Line Items]
Number of Properties			4
Costs Incurred to Date				497,350
Purchase Commitment, Remaining Minimum Amount Committed				81,979
Participating Loan Investment Steele Creek Denver Colorado [Member]
Long-term Purchase Commitment [Line Items]
Number of Properties			1
Costs Incurred to Date				90,747
Purchase Commitment, Remaining Minimum Amount Committed				2,711
Average Ownership Stake			0.00%
Preferred Equity Investment West Coast Development JV [Member]
Long-term Purchase Commitment [Line Items]
Number of Properties			5
Costs Incurred to Date				136,327
Purchase Commitment, Remaining Minimum Amount Committed				$ 0
Average Ownership Stake			48.00%
[1]	Represents 100% of project costs incurred to date.

Commitments and Contingencie111

Commitments and Contingencies (Details 1) $ in Thousands	Dec. 31, 2015USD ($)
Office Space [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,015	$ 207
2,016	179
2,018	76
2,019	76
2,017	76
Thereafter	32
Total	646
Ground Leases [Member]
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,015	5,444
2,016	5,444
2,018	5,444
2,019	5,444
2,017	4,486
Thereafter	311,858
Total	$ 338,120	[1]
[1]	For purposes of our ground lease contracts, the Company uses the minimum lease payment, if stated in the agreement. For ground lease agreements where there is a reset provision based on the communities appraised value or consumer price index but does not include a specified minimum lease payment, the Company uses the current rent over the remainder of the lease term.

Commitments and Contingencie112

Commitments and Contingencies (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)Communities	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2015
Real Estate Properties [Line Items]
Number of Real Estate Properties	133			2
Wholly-owned — redevelopment
Real Estate Properties [Line Items]
Development costs and capital expenditures Incurred but not yet paid	$ 1.2
Number of Real Estate Properties				3
Wholly-owned — under development
Real Estate Properties [Line Items]
Development costs and capital expenditures Incurred but not yet paid	12.6
Number of Real Estate Properties				1
Office Space [Member]
Real Estate Properties [Line Items]
Rent expense	$ 0.3	$ 1.3	$ 1.3
Ground Leases [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Communities	6
Rent expense	$ 5.5	$ 5.4	$ 5.2

Reportable Segments (Details)

Reportable Segments (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)Segments	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Reportable Segment (Textual) [Abstract]
Number of reportable segments | Segments									2
Condition for Community considered to have stabilized occupancy									0.9
Number of tenants or related group of tenants that contributed 10% or more of company total revenue									0	0	0
Reportable apartment home segment rental income									$ 894,638	$ 818,046	$ 758,926
Reportable apartment home segment NOI									613,869	556,321	514,041
Joint Venture Managment and Other Fees									22,710	13,044	12,442
Reconciling items:
Property management									(23,978)	(22,142)	(20,780)
Other operating expenses									(9,708)	(8,271)	(7,136)
Depreciation and amortization									(374,598)	(358,154)	(341,490)
General and administrative									(59,690)	(47,800)	(42,238)
Casualty-related (recoveries)/charges, net									(2,335)	(541)	12,253
Other depreciation and amortization									(6,679)	(5,775)	(6,741)
Income/(loss) from unconsolidated entities									62,329	(7,006)	(415)
Interest Expense									(121,875)	(130,454)	(126,083)
Interest and Other Income Including Discontinued Operations									1,551	11,837	4,681
Tax benefit/(expense) of taxable REIT subsidiary, net									3,886	15,136	7,299
Gain Loss on the Sale of Real Estate, Including Discontinued Operations									251,677	143,647	40,449
Redeemable non-controlling interests in OP									(16,773)	(5,511)	(1,530)
Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable									(3)	3	60
Net income/(loss) attributable to Entity									340,383	154,334	44,812
Reportable apartment home segment assets:
Total segment assets	$ 9,190,276				$ 8,383,259				9,190,276	8,383,259
Accumulated depreciation	(2,646,874)				(2,434,772)				(2,646,874)	(2,434,772)
Total real estate owned, net of accumulated depreciation	6,543,402				5,948,487				6,543,402	5,948,487
Reconciling items:
Cash and cash equivalents	6,742				15,224				6,742	15,224	30,249	$ 12,115
Restricted Cash	20,798				22,340				20,798	22,340
Deferred financing costs, net					0					0
Notes receivable	16,694				14,369				16,694	14,369
Investment in and advances to unconsolidated joint ventures, net	938,906				718,226				938,906	718,226
Other assets	137,302				110,082				137,302	110,082
Total assets	7,663,844				6,828,728				7,663,844	6,828,728
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									203,183	326,461	452,057
Same Communities
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									72,300	52,500	43,000
Same Communities Western Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									255,346	236,175	214,324
Reportable apartment home segment NOI									190,682	171,973	152,108
Reportable apartment home segment assets:
Total segment assets	2,371,615				2,336,271				2,371,615	2,336,271
Same Communities Mid-Atlantic Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									157,158	154,491	150,489
Reportable apartment home segment NOI									108,324	107,592	105,300
Reportable apartment home segment assets:
Total segment assets	1,423,888				1,440,561				1,423,888	1,440,561
Same Communities Southeastern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									103,920	98,061	93,479
Reportable apartment home segment NOI									69,820	65,053	61,087
Reportable apartment home segment assets:
Total segment assets	730,060				727,933				730,060	727,933
Same Communities Southwestern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									57,670	54,810	52,302
Reportable apartment home segment NOI									35,767	33,725	31,925
Reportable apartment home segment assets:
Total segment assets	450,305				440,587				450,305	440,587
Same Communities Northeast Region [Member]
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									86,048	81,500	77,299
Reportable apartment home segment NOI									64,539	61,315	57,350
Reportable apartment home segment assets:
Total segment assets	1,109,354				1,076,656				1,109,354	1,076,656
Non-Mature communities/Other
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									211,786	180,112	167,743
Reportable apartment home segment NOI									144,737	116,663	106,271
Reportable apartment home segment assets:
Total segment assets	3,105,054				2,361,251				3,105,054	2,361,251
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									12,900	10,900	12,800
Total Communities [Member]
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									$ 871,928	805,149	$ 755,636
United Dominion Reality L.P.
Reportable Segment (Textual) [Abstract]
Related party management fee percentage									2.75%
Number of reportable segments | Segments									2
Number of tenants or related group of tenants that contributed 10% or more of company total revenue									0		0
Reportable apartment home segment rental income									$ 440,408	422,634	$ 410,842
Reportable apartment home segment NOI									317,597	300,313	287,535
Reconciling items:
Property management									(12,111)	(11,622)	(11,298)
Other operating expenses									(5,923)	(5,172)	(5,728)
Depreciation and amortization									(169,784)	(179,176)	(181,302)
General and administrative									(27,016)	(28,541)	(24,808)
Casualty-related (recoveries)/charges, net									(843)	(541)	8,083
Income/(loss) from unconsolidated entities									(4,659)	0	0
Interest Expense									(40,321)	(41,717)	(36,058)
Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable									(1,762)	(952)	(4,566)
Net (loss)/gain on sale of depreciable property									158,123	63,635	41,518
Net income/(loss) attributable to Entity	114,955	$ 14,617	$ 47,383	$ 36,346	32,631	$ 8,637	$ 24,426	$ 30,533	213,301	96,227	73,376
Reportable apartment home segment assets:
Total segment assets	3,630,905				4,238,770				3,630,905	4,238,770
Total real estate owned, net of accumulated depreciation	2,349,647				2,835,467				2,349,647	2,835,467
Reconciling items:
Cash and cash equivalents	3,103				502				3,103	502	1,897	$ 2,804
Deferred financing costs, net	(2,199)				(4,500)				(2,199)	(4,500)
Investment in and advances to unconsolidated joint ventures, net	166,186				0				166,186	0
Other assets	24,528				24,029				24,528	24,029
Total assets	2,554,808				2,873,809				2,554,808	2,873,809
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									61,196	91,682	151,002
United Dominion Reality L.P. | Same Communities Western Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									174,414	160,185	150,137
Reportable apartment home segment NOI									130,509	117,130	107,866
Reportable apartment home segment assets:
Total segment assets	1,461,078				1,433,827				1,461,078	1,433,827
United Dominion Reality L.P. | Same Communities Mid-Atlantic Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									60,602	65,565	64,923
Reportable apartment home segment NOI									40,301	44,366	44,442
Reportable apartment home segment assets:
Total segment assets	410,710				686,708				410,710	686,708
United Dominion Reality L.P. | Same Communities Southeastern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									44,981	42,568	40,730
Reportable apartment home segment NOI									30,106	28,111	26,590
Reportable apartment home segment assets:
Total segment assets	321,787				316,788				321,787	316,788
United Dominion Reality L.P. | Same Communities Southwestern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									20,963	26,580	25,614
Reportable apartment home segment NOI									13,176	16,821	16,057
Reportable apartment home segment assets:
Total segment assets	0				228,997				0	228,997
United Dominion Reality L.P. | Same Communities Northeast Region [Member]
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									59,444	58,788	55,850
Reportable apartment home segment NOI									45,917	45,347	42,146
Reportable apartment home segment assets:
Total segment assets	669,082				777,375				669,082	777,375
United Dominion Reality L.P. | Non-Mature communities/Other
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									80,004	68,948	73,588
Reportable apartment home segment NOI									57,588	48,538	$ 50,434
Reportable apartment home segment assets:
Total segment assets	$ 768,248				$ 795,075				768,248	795,075
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									$ 5,000	$ 3,200
United Dominion Reality L.P. | Minimum
Reportable Segment (Textual) [Abstract]
Percent occupancy to be considered a community									90.00%
Community Threshold, Period Above Occupancy Threshold									3 months
United Dominion Reality L.P. | Taxable REIT Subsidiaries
Reportable Segment (Textual) [Abstract]
Related party management fee percentage									2.75%

Hurricane Related Charges (Deta

Hurricane Related Charges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Hurricane Related Charges [Line Items]
Casualty-related (recoveries)/charges, net	$ (2,335)	$ (541)	$ 12,253
United Dominion Reality L.P.
Hurricane Related Charges [Line Items]
Casualty-related (recoveries)/charges, net	$ (843)	$ (541)	$ 8,083

Unaudited Summarized Consoli115

Unaudited Summarized Consolidated Quarterly Financial Data Unaudited Summarized Consolidated Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Rental income	[1]	$ 234,352		$ 217,765		$ 212,764		$ 207,047		$ 206,104	$ 203,587	$ 200,959	$ 194,352
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest		4,528		13,695		10,842		76,417		6,485	10,611	4,359	(5,195)	$ 105,482	$ 16,260	$ 2,340
Income/(loss) from discontinued operations, net of tax										0	79	18	(87)	0	10	43,942
Net (loss)/income attributable to stakeholders		$ 161,270		$ 12,361		$ 85,924		$ 72,891		$ 64,486	$ 39,618	$ 29,076	$ 17,430	$ 336,661	$ 150,610	$ 41,088
Earnings Per Share, Basic		$ 0.62	[2]	$ 0.05	[2]	$ 0.33	[2]	$ 0.28	[2]					$ 1.30	$ 0.60	$ 0.16
Earnings Per Share, Diluted		$ 0.61		$ 0.05		$ 0.33		$ 0.28						$ 1.29	$ 0.59	$ 0.16
Earnings per weighted average common share - basic and diluted:
Net (loss)/income attributable to common stockholders — basic and diluted (in dollars per share)	[2]									$ 0.25	$ 0.16	$ 0.12	$ 0.07
Weighted Average Number of Shares Outstanding, Basic		260,830		259,114		257,849		256,834		253,983	251,655	250,255	250,177	258,669	251,528	249,969
Weighted average number of common shares outstanding — diluted		266,108		261,207		262,806		258,662		256,000	253,732	252,191	251,822	263,752	253,445	249,969
[1]	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
[2]	.

Consolidation and Basis of P116

Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)	12 Months Ended
	Dec. 31, 2015Communities	Dec. 31, 2014shares	Dec. 31, 2013shares	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes	Dec. 31, 2015shares	Dec. 31, 2015Markets	Dec. 31, 2012shares
Consolidation and Basis of Presentation [Line Items]
Number of Real Estate Properties	133			2
Number of markets operating within | $					18
Number of apartments owned | Apartment_Homes						40,728
Operating Partnership outstanding units		183,278,698					183,278,698
OP units outstanding related to limited partner		183,278,698	183,278,698				183,278,698		184,281,254
Limited Partner [Member]
Consolidation and Basis of Presentation [Line Items]
Percentage of units outstanding owned by limited partners				95.10%
United Dominion Reality L.P.
Consolidation and Basis of Presentation [Line Items]
Rental revenues percent of General Partner's consolidated rental revenues	51.00%	52.00%	54.00%
Number of Real Estate Properties | Communities	57
Number of markets operating within | Markets								14
Number of apartments owned | Apartment_Homes						16,974
OP units outstanding related to general partner		110,883					110,883
Percentage of total outstanding Operating Partnership units represented by General Partnership units outstanding				0.10%
OP units outstanding related to limited partner		183,167,815					183,167,815
UDR, Inc.
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		174,002,342					174,114,516
Percentage of units outstanding owned by limited partners		95.00%		95.10%
Non-affiliated Partners
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		9,165,473					9,053,299
Percentage of units outstanding owned by limited partners		5.00%		4.90%
General Partner [Member]
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		174,113,225					174,225,399
Percentage of units outstanding owned by limited partners		95.00%
Class A Limited Partner
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner							1,751,671
Class A Limited Partner | United Dominion Reality L.P.
Consolidation and Basis of Presentation [Line Items]
OP units outstanding related to limited partner		1,751,671					1,873,332

Consolidation and Basis of P117

Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P. - Phantoms) (Details) - shares	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Limited partnership units owned	183,278,698	183,278,698	183,278,698	184,281,254
United Dominion Reality L.P.
General Partners' Capital Account, Units Outstanding	110,883	110,883
Limited partnership units owned	183,167,815	183,167,815

Significant Accounting Polic118

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Accounting Policies [Line Items]
Deferred Finance Costs, Net		$ 0
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company	0.1
Development costs excluding direct costs and capitalized interest	$ 6,300	9,000	$ 11,100
Interest capitalized during period	16,100	20,200	29,400
Advertising expense	6,400	6,000	5,700
Secured debt, net	$ 1,376,945	1,354,321
Minimum | Buildings
Accounting Policies [Line Items]
Estimated useful lives	35 years
Minimum | Building improvements
Accounting Policies [Line Items]
Estimated useful lives	10 years
Minimum | Furniture, fixtures, equipment, and other assets
Accounting Policies [Line Items]
Estimated useful lives	3 years
Maximum | Buildings
Accounting Policies [Line Items]
Estimated useful lives	55 years
Maximum | Building improvements
Accounting Policies [Line Items]
Estimated useful lives	35 years
Maximum | Furniture, fixtures, equipment, and other assets
Accounting Policies [Line Items]
Estimated useful lives	10 years
United Dominion Reality L.P.
Accounting Policies [Line Items]
Deferred Finance Costs, Net	$ (2,199)	(4,500)
Cumulative Adjustment to Net Income Attributable to Noncontrolling Interest		3,300
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company	0.10
Development costs excluding direct costs and capitalized interest	$ 700	2,000	2,500
Interest capitalized during period	200	2,900	5,900
Advertising expense	2,400	2,500	$ 2,500
Secured debt, net	$ 475,964	927,484
United Dominion Reality L.P. | Minimum | Buildings
Accounting Policies [Line Items]
Estimated useful lives	35 years
United Dominion Reality L.P. | Minimum | Building improvements
Accounting Policies [Line Items]
Estimated useful lives	10 years
United Dominion Reality L.P. | Minimum | Furniture, fixtures, equipment, and other assets
Accounting Policies [Line Items]
Estimated useful lives	3 years
United Dominion Reality L.P. | Maximum | Buildings
Accounting Policies [Line Items]
Estimated useful lives	55 years
United Dominion Reality L.P. | Maximum | Building improvements
Accounting Policies [Line Items]
Estimated useful lives	35 years
United Dominion Reality L.P. | Maximum | Furniture, fixtures, equipment, and other assets
Accounting Policies [Line Items]
Estimated useful lives	10 years
Scenario, Previously Reported [Member]
Accounting Policies [Line Items]
Deferred Finance Costs, Net		22,686
Secured debt, net		1,361,529
Scenario, Previously Reported [Member] | United Dominion Reality L.P.
Accounting Policies [Line Items]
Secured debt, net		$ 931,959

Discontinued Operations (UNI119

Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2014USD ($)Communities	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015Communities	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes	Dec. 31, 2014USD ($)Communities	Dec. 31, 2013USD ($)CommunitiesApartment_Homes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment							$ 138,600
Discontinued Operations (Textual) [Abstract]
Number of communities sold					12	9
Number of apartment homes sold						2,500		2,735		914
Proceeds from Sale of Property, Plant, and Equipment							408,700		$ 328,400	$ 81,100
Summary of income from discontinued operations
Rental income							0		147	9,152
Rental expenses							0		225	3,511
Property management fee							0		4	252
Real estate depreciation							0		0	1,958
Interest							0		21	(62)
Income before net gain on the sale of property							0		(103)	3,493
Income/(loss) from discontinued operations	$ 0	$ 79	$ 18	$ (87)			0		10	$ 43,942
United Dominion Reality L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment									$ 24,400
Discontinued Operations (Textual) [Abstract]
Number of communities sold						5			1	2
Number of apartment homes sold | Apartment_Homes								1,149		914
Proceeds from Sale of Property, Plant, and Equipment							250,900		$ 48,700	$ 81,100
Number of communities held for sale | Communities	0								0
Summary of income from discontinued operations
Rental income							0		$ 0	8,989
Rental expenses							0		0	3,149
Property management fee							0		0	247
Real estate depreciation							0		0	1,935
Income before net gain on the sale of property							0		0	3,658
Net (loss)/gain on the sale of depreciable property							0		0	41,518
Income/(loss) from discontinued operations							0		$ 0	$ 45,176
Operating Community [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment							142,500
Discontinued Operations (Textual) [Abstract]
Number of communities sold						1
Operating Community [Member] | United Dominion Reality L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment							62,500
Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment							1,100
Land | United Dominion Reality L.P.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment							$ 1,100

Real Estate Owned (UNITED DO120

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Land	$ 1,833,156	$ 1,790,281
Under development:
Real estate under development (net of accumulated depreciation of $0)	124,072	177,632
Real estate owned	9,190,276	8,383,259
Real Estate Investment Property, Accumulated Depreciation	2,646,044	2,434,772
Accumulated depreciation	(2,646,874)	(2,434,772)	$ (2,208,794)	$ (1,924,682)
Total real estate owned, net of accumulated depreciation	6,543,402	5,948,487
Land
Held for sale:
Sold or held for sale	9,963	0
Under development:
Real estate under development (net of accumulated depreciation of $0)	78,085	24,584
Building and improvements
Held for sale:
Sold or held for sale	2,642	0
Construction in progress
Under development:
Real estate under development (net of accumulated depreciation of $0)	45,987	153,048
United Dominion Reality L.P.
Property, Plant and Equipment [Line Items]
Land	833,300	1,008,014
Depreciable property - held and used:
Building and improvements	2,797,605	3,230,756
Under development:
Real estate owned	3,630,905	4,238,770
Real Estate Investment Property, Accumulated Depreciation	1,281,258	1,403,303
Accumulated depreciation	(1,281,258)	(1,403,303)	$ (1,241,574)	$ (1,097,133)
Total real estate owned, net of accumulated depreciation	$ 2,349,647	$ 2,835,467

Real Estate Owned (UNITED DO121

Real Estate Owned (UNITED DOMINION REALTY, L.P.) Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details 1) $ in Thousands	Dec. 31, 2015USD ($)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land	$ 173,924
Business Acquisition Purchase Price Allocation Buildings and Improvements	708,455
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	25,455
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	907,834
United Dominion Reality L.P.
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land	27,749
Business Acquisition Purchase Price Allocation Buildings and Improvements	111,878
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	2,373
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	$ 142,000

Real Estate Owned (UNITED DO122

Real Estate Owned (UNITED DOMINION REALTY, L.P.) Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Investment Property, at Cost	$ 9,053,599	$ 8,205,627
Real estate held for investment, net	6,407,555	5,770,855
Cash and Cash Equivalents, at Carrying Value	6,742	15,224	$ 30,249	$ 12,115
Other Assets	137,302	110,082
Assets	7,663,844	6,828,728
Secured debt, net	1,376,945	1,354,321
Taxes Payable	18,786	15,978
Accounts payable, accrued expenses, and other liabilities	(81,356)	(91,282)
Liabilities	3,816,797	3,810,298
United Dominion Reality L.P.
Real Estate Investment Property, at Cost	3,630,905	4,238,770
Cash and Cash Equivalents, at Carrying Value	3,103	502	1,897	$ 2,804
Other Assets	24,528	24,029
Assets	2,554,808	2,873,809
Secured debt, net	475,964	927,484
Taxes Payable	2,775	7,061
Accounts payable, accrued expenses, and other liabilities	(12,964)	(22,436)
Liabilities	833,478	1,139,758
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.
Real Estate Investment Property, at Cost	(628,479)	0	0
Real Estate Owned, Accumulated Depreciation	223,363	0	0
Real estate held for investment, net	(405,116)	$ 0	$ 0
Cash and Cash Equivalents, at Carrying Value	(140)
Other Assets	(1,680)
Assets	(406,936)
Secured debt, net	(228,390)
Taxes Payable	(4,123)
Accounts payable, accrued expenses, and other liabilities	(5,781)
Liabilities	$ (238,294)

Real Estate Owned (UNITED DO123

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2015Communities	Dec. 31, 2015Communities	Dec. 31, 2015USD ($)Communities	Dec. 31, 2015CommunitiesApartment_Homes	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)CommunitiesApartment_Homes	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2015Apartment_Homes	Dec. 31, 2015States
Real Estate Properties [Line Items]
Number of Real Estate Properties	133	133	133	133			2
Number of States in which Entity Operates							10
Real Estate Owned (Textual) [Abstract]
Number of apartments owned | Apartment_Homes									40,728
Number of apartment homes acquired		358
Development costs excluding direct costs and capitalized interest			$ 6,300		$ 9,000	$ 11,100
Capitalized Interest Costs, Including Allowance for Funds Used During Construction			16,100		20,200	29,400
Other Cost and Expense, Operating			9,708		8,271	$ 7,136
Communities Sold	12	9
Apartment Homes Sold		2,500		2,735		914
Proceeds from Sale of Property, Plant, and Equipment			408,700		328,400	$ 81,100
Gain (Loss) on Disposition of Property Plant Equipment			138,600
Payments for (Proceeds from) Investments			(387,650)		(383,886)	(250,043)
Gain/(loss) on sales of real estate owned			$ 251,677		143,572	0
Deferred Gain on Sale of Property					24,700			$ 6,800
United Dominion Reality L.P.
Real Estate Properties [Line Items]
Number of Communities Deconsolidated		7
Number of Real Estate Properties | Communities	57	57	57	57
Number of States in which Entity Operates | States										8
Real Estate Owned (Textual) [Abstract]
Number of apartments owned | Apartment_Homes									16,974
Number of communities acquired apartment homes are within | Communities	1
Number of apartment homes acquired		421
Property, Plant and Equipment, Additions			$ 142,000
Development costs excluding direct costs and capitalized interest			700		2,000	2,500
Capitalized Interest Costs, Including Allowance for Funds Used During Construction			200		2,900	5,900
Other Cost and Expense, Operating			5,923		$ 5,172	$ 5,728
Communities Sold		5			1	2
Apartment Homes Sold | Apartment_Homes				1,149		914
Proceeds from Sale of Property, Plant, and Equipment			250,900		$ 48,700	$ 81,100
Gain (Loss) on Disposition of Property Plant Equipment					24,400
Payments for (Proceeds from) Investments			(232,400)		(47,900)
Gain/(loss) on sales of real estate owned			158,123		63,635	$ 0
Deferred Gain on Sale of Property					$ 24,622			0
Unconsolidated Joint Venture Four Texas [Member] | United Dominion Reality L.P.
Real Estate Owned (Textual) [Abstract]
Communities Sold					2
Gain (Loss) on Disposition of Property Plant Equipment					$ 39,200
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.
Real Estate Properties [Line Items]
Number of Real Estate Properties							13
Real Estate Owned (Textual) [Abstract]
Deferred Gain on Sale of Property								$ 296,400
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.
Real Estate Owned (Textual) [Abstract]
Gain/(loss) on sales of real estate owned			$ 133,500

Unconsolidated Entities (UNI124

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	Dec. 31, 2015Communities	Dec. 31, 2015	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties	133	2
Investment in unconsolidated entities			$ 938,906	$ 718,226
United Dominion Reality L.P.
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties | Communities	57
Investment in unconsolidated entities			$ 166,186	0
United Dominion Reality L.P. | UDR Lighthouse DownREIT L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Real Estate Properties		13
Number of Units in Real Estate Property		6,261
Investment in unconsolidated entities				$ 0
Equity Method Investment, Ownership Percentage		41.60%		0.00%

Unconsolidated Entities (UNI125

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	$ 219,714	$ 193,453	$ 142,842
Equity Method Investment Summarized Financial Information Property Operating Expense	(87,500)	72,099	49,390
Equity Method Investment Summarized Financial Information Depreciation Amortization	(75,492)	69,399	51,830
Equity Method of Investment Summarized Financial Information Operating income/(loss)	56,722	51,955	41,622
Equity Method Investment Summarized Financial Information Interest expense	(64,990)	(58,591)	(45,726)
Equity Method Investment Summarized Financial Information Other income/(expense)			1
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	175,850	(42,667)	(36,075)
Income/(loss) from unconsolidated entities	62,329	(7,006)	(415)
Equity Method Investment Summarized Financial Information Real Estate, Net	3,135,757	2,941,803
Equity Method Investment Summarized Financial Information Cash and cash equivalents	36,480	32,544
Equity Method Investment Summarized Financial Information Other assets	29,891	17,849
Equity Method Investment Summarized Financial Information Amount Due to Related Party	7,266	2,997
Equity Method Investment, Summarized Financial Information, Assets	3,202,128	3,208,392
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities	95,523	44,335
Equity Method Investment, Summarized Financial Information, Liabilities	1,717,252	1,770,657
Equity Method Investment Summarized Financial Information, Equity	1,484,876	1,437,735
Investment in unconsolidated entities	938,906	718,226
UDR Lighthouse DownREIT L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Net Income (Loss)	(15,804)
United Dominion Reality L.P.
Schedule of Equity Method Investments [Line Items]
Income/(loss) from unconsolidated entities	(4,659)	0	$ 0
Investment in unconsolidated entities	166,186	0
United Dominion Reality L.P. | UDR Lighthouse DownREIT L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Revenue	29,933
Equity Method Investment Summarized Financial Information Property Operating Expense	(9,991)
Equity Method Investment Summarized Financial Information Depreciation Amortization	(28,934)
Equity Method of Investment Summarized Financial Information Operating income/(loss)	(8,992)
Equity Method Investment Summarized Financial Information Interest expense	(3,632)
Equity Method Investment Summarized Financial Information Other income/(expense)	(3,180)
Equity Method Investment Summarized Financial Information Real Estate, Net	1,457,244
Equity Method Investment Summarized Financial Information Cash and cash equivalents	89
Equity Method Investment Summarized Financial Information Other assets	37,228
Equity Method Investment Summarized Financial Information, Notes Receivable	126,500
Equity Method Investment Summarized Financial Information Amount Due to Related Party	35,293
Equity Method Investment, Summarized Financial Information, Assets	1,656,354
Equity Method Investments Summarized Financial Information Secured Debt, net	524,052
Equity Method Investment Summarized Financial Information Accounts payable and accrued liabilities	25,487
Equity Method Investment, Summarized Financial Information, Liabilities	549,539
Equity Method Investment Summarized Financial Information, Equity	1,106,815
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	$ 1,656,354
Investment in unconsolidated entities		$ 0

Unconsolidated Entities (UNI126

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Net Income (Loss)	$ 319,385	$ 105,875
United Dominion Reality L.P.
Business Acquisition Pro Forma Net Income (Loss) from Equity Method Investments	(12,006)	(26,511)
Business Acquisition, Pro Forma Net Income (Loss)	$ 205,954	$ 69,716

Unconsolidated Entities (UNI127

Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) Unconsolidated Entities (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income/(loss) from unconsolidated entities	$ 62,329	$ (7,006)	$ (415)
UDR DownREIT Unit [Member]
Equity Method Investment, Ownership Percentage	50.10%
UDR DownREIT Unit [Member] | United Dominion Reality L.P.
Equity Method Investment, Ownership Percentage	41.60%
UDR DownREIT Unit [Member] | UDR, Inc.
Equity Method Investment, Ownership Percentage	8.50%
United Dominion Reality L.P.
Income/(loss) from unconsolidated entities	$ (4,659)	$ 0	$ 0
Cash Received in Equity Method Investment Exchange	$ 25,500

Debt (UNITED DOMINION REALTY128

Debt (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Communities	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.74%
Weighted Average Years to Maturity	5 years 10 days
Deferred Finance Costs, Net		$ 0
Fixed Rate Debt
Debt Instrument [Line Items]
Principal outstanding	$ 952,801	963,713
Weighted Average Interest Rate	4.93%
Weighted Average Years to Maturity	3 years 8 months 19 days
Number of Communities Encumbered	26
Fixed Rate Debt | Mortgages [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.57%
Weighted Average Years to Maturity	4 years 6 months 3 days
Number of Communities Encumbered	8
Fixed Rate Debt | Fannie Mae credit facilities
Debt Instrument [Line Items]
Weighted Average Years to Maturity	3 years 20 days
Number of Communities Encumbered	18
Variable Rate Debt
Debt Instrument [Line Items]
Principal outstanding	$ 424,144	390,608
Weighted Average Interest Rate	1.53%
Weighted Average Years to Maturity	4 years 6 months 10 days
Number of Communities Encumbered	11
Variable Rate Debt | Mortgages [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.19%
Weighted Average Years to Maturity	1 year 26 days
Number of Communities Encumbered	1
Variable Rate Debt | Tax-exempt secured notes payable
Debt Instrument [Line Items]
Weighted Average Interest Rate	0.75%
Weighted Average Years to Maturity	7 years 2 months 8 days
Number of Communities Encumbered	2
Variable Rate Debt | Fannie Mae credit facilities
Debt Instrument [Line Items]
Weighted Average Years to Maturity	4 years 19 days
Number of Communities Encumbered	8
United Dominion Reality L.P.
Debt Instrument [Line Items]
Principal outstanding	$ 475,964	927,484
Weighted Average Interest Rate	3.76%
Weighted Average Years to Maturity	4 years 6 months 14 days
Number of Communities Encumbered | Communities	16
Deferred Finance Costs, Net	$ (2,199)	(4,500)
United Dominion Reality L.P. | Fixed Rate Debt
Debt Instrument [Line Items]
Principal outstanding	$ 279,333	708,534
Weighted Average Interest Rate	4.90%
Weighted Average Years to Maturity	3 years 3 months 9 days
Number of Communities Encumbered | Communities	9
United Dominion Reality L.P. | Fixed Rate Debt | Mortgages [Member]
Debt Instrument [Line Items]
Principal outstanding	$ 30,132	378,371
Weighted Average Interest Rate	3.43%
Weighted Average Years to Maturity	7 months 2 days
Number of Communities Encumbered | Communities	1
United Dominion Reality L.P. | Fixed Rate Debt | Fannie Mae credit facilities
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.08%
Weighted Average Years to Maturity	3 years 7 months 27 days
Number of Communities Encumbered | Communities	8
United Dominion Reality L.P. | Variable Rate Debt
Debt Instrument [Line Items]
Principal outstanding	$ 196,631	218,950
Weighted Average Interest Rate	1.74%
Weighted Average Years to Maturity	6 years 3 months
Number of Communities Encumbered | Communities	7
United Dominion Reality L.P. | Variable Rate Debt | Tax-exempt secured notes payable
Debt Instrument [Line Items]
Principal outstanding	$ 27,000	27,000
Weighted Average Interest Rate	0.76%
Weighted Average Years to Maturity	16 years 2 months 19 days
Number of Communities Encumbered | Communities	1
United Dominion Reality L.P. | Variable Rate Debt | Fannie Mae credit facilities
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.90%
Weighted Average Years to Maturity	4 years 8 months 1 day
Number of Communities Encumbered | Communities	6
Secured Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Net		(7,208)
Secured Debt [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Deferred Finance Costs, Net	$ (4,278)	(5,583)
Secured Debt [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(1,271)	(1,625)
Secured Debt [Member] | United Dominion Reality L.P. | Fixed Rate Debt
Debt Instrument [Line Items]
Deferred Finance Costs, Net	(1,627)	(3,665)
Secured Debt [Member] | United Dominion Reality L.P. | Variable Rate Debt
Debt Instrument [Line Items]
Deferred Finance Costs, Net	$ (572)	$ (810)

Debt (UNITED DOMINION REALTY129

Debt (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013	Dec. 31, 2014
Debt Instrument [Line Items]
Borrowings outstanding	$ 2,300		$ 1,900
Fannie Mae
Debt Instrument [Line Items]
Borrowings outstanding	813,840		$ 834,282
Weighted average daily borrowings during the period ended	822,521	$ 835,873
Maximum daily borrowings during the period ended	$ 834,003	$ 837,564
Weighted average interest rate during the period ended	4.02%	4.10%
Interest rate at the end of the period	3.93%		4.00%
United Dominion Reality L.P. | Fannie Mae
Debt Instrument [Line Items]
Borrowings outstanding	$ 421,031		$ 526,588
Weighted average daily borrowings during the period ended	425,522	$ 527,592
Maximum daily borrowings during the period ended	$ 431,462	$ 528,659
Weighted average interest rate during the period ended	3.80%	4.10%
Interest rate at the end of the period	3.80%		4.00%

Debt (UNITED DOMINION REALTY130

Debt (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
2,013	$ 244,111
2,014	275,526
2,015	511,065
2,016	315,496
2,017	620,664
Long-Term Debt, Maturities, Repayments of Principal in Year Six	350,000
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	400,000
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	96,409
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	315,644
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	427,600
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	3,583,515
Debt Instrument, Unamortized Discount (Premium), Net	(12,720)
Total	1,376,945	$ 1,354,321
Secured Debt [Member]
Debt Instrument [Line Items]
2,013	149,058
2,014	275,526
2,015	211,065
2,016	315,496
2,017	170,664
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	96,409
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	127,600
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	1,372,818
Debt Instrument, Unamortized Discount (Premium), Net	4,127
Secured Debt [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
2,013	149,058
2,014	179,189
2,015	73,096
2,016	247,796
2,017	170,664
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	127,600
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Long-term Debt, Gross	947,403
Debt Instrument, Unamortized Discount (Premium), Net	5,398
Secured Debt [Member] | Variable Rate Debt
Debt Instrument [Line Items]
2,013	0
2,014	96,337
2,015	137,969
2,016	67,700
2,017	0
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	96,409
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	425,415
Debt Instrument, Unamortized Discount (Premium), Net	(1,271)
Unsecured Debt [Member]
Debt Instrument [Line Items]
2,013	95,053
2,014	0
2,015	300,000
2,016	0
2,017	450,000
Long-Term Debt, Maturities, Repayments of Principal in Year Six	350,000
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	400,000
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	315,644
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	300,000
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Long-term Debt, Gross	2,210,697
Debt Instrument, Unamortized Discount (Premium), Net	(16,847)
United Dominion Reality L.P.
Debt Instrument [Line Items]
2,013	30,517
2,014	22,206
2,015	145,199
2,016	123,095
2,017	62,836
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	67,310
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Long-term Debt, Gross	478,163
Debt Instrument, Unamortized Discount (Premium), Net	(2,199)
Total	475,964	$ 927,484
United Dominion Reality L.P. | Mortgages [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
2,013	30,132
2,014	0
2,015	0
2,016	0
2,017	0
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Total	30,035
United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt
Debt Instrument [Line Items]
2,013	385
2,014	15,640
2,015	48,872
2,016	123,095
2,017	62,836
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Total	249,298
United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt
Debt Instrument [Line Items]
2,013	0
2,014	6,566
2,015	96,327
2,016	0
2,017	0
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	67,310
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	0
Total	169,724
United Dominion Reality L.P. | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	27,000
Debt Instrument, Unamortized Discount (Premium), Net	(93)
United Dominion Reality L.P. | Secured Debt [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	30,132
Debt Instrument, Unamortized Discount (Premium), Net	(97)
United Dominion Reality L.P. | Secured Debt [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	250,828
Debt Instrument, Unamortized Discount (Premium), Net	(1,530)
United Dominion Reality L.P. | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	170,203
Debt Instrument, Unamortized Discount (Premium), Net	(479)
United Dominion Reality L.P. | Tax-exempt secured notes payable | Variable Rate Debt
Debt Instrument [Line Items]
2,013	0
2,014	0
2,015	0
2,016	0
2,017	0
Long-Term Debt, Maturities, Repayments of Principal in Year Six	0
Long-Term Debt, Maturities, Repayments of Principal in Year Seven	0
Long-Term Debt, Maturities, Repayment of Principal in Year Eight	0
Long-Term Debt, Maturities, Repayment of Principal in Year Nine	0
Long-Term Debt, Maturities, Repayments of Principal in Year Ten	0
Long-Term Debt, Maturities, Repayments of Principal after Year Ten	27,000
Total	$ 26,907

Debt (UNITED DOMINION REALTY131

Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($)	Jun. 27, 2014	Sep. 26, 2013	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Amortization of Financing Costs				$ 7,000,000	$ 7,200,000
Borrowings outstanding				$ 2,300,000	1,900,000
Debt Instrument, Interest Rate During Period				3.74%
UDR Bank Credit Facility
Debt Instrument [Line Items]
Total revolving credit facility				$ 2,000,000,000	900,000,000
Fixed Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 952,801,000	963,713,000
Debt Instrument, Interest Rate During Period				4.93%
Variable Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 424,144,000	390,608,000
Debt Instrument, Interest Rate During Period				1.53%
Fannie Mae
Debt Instrument [Line Items]
Borrowings outstanding				$ 813,840,000	834,282,000
Fannie Mae credit facilities | Fixed Rate Debt
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate				5.23%
Debt Instrument, Maturity Date Range, Start				May 1, 2017
Debt Instrument, Maturity Date Range, End				Jul. 1, 2023
Fannie Mae credit facilities | Variable Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate at Period End				1.71%
Mortgages [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				4.57%
Debt Instrument, Maturity Date Range, Start				Jun. 1, 2016
Debt Instrument, Maturity Date Range, End				Nov. 1, 2025
Notes payable minimum interest rates range				3.43%
Notes payable maximum interest rates range				6.16%
Mortgages [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				2.19%
Tax-exempt secured notes payable | Variable Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				0.75%
Unsecured Revolving Credit Facility due October 2015
Debt Instrument [Line Items]
Borrowings outstanding				$ 150,000,000	152,500,000
Debt Instrument, Interest Rate During Period				1.19%
Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				5.25%
4.25% Medium-Term Notes due June 2018
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				4.25%
Three point seven percent medium term note due October 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				3.70%
ThreePointSevenTermNotesDueOctober2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date		Oct. 1, 2020
1.44% Term notes due January 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				1.44%
Debt Instrument, Maturity Date	Jan. 29, 2021
4.63% Medium-Term Notes due January 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				4.63%
3.75 MTN Due July 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				3.75%
Debt Instrument, Maturity Date	Jul. 31, 2024
4.00% MTN Due October 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				4.00%
Debt Instrument, Maturity Date			Oct. 1, 2025
United Dominion Reality L.P.
Debt Instrument [Line Items]
Amortization of Financing Costs				$ 1,300,000	1,400,000
Secured Debt Including Debt on Real Estate Held for Sale				$ 475,964,000	927,484,000
Debt Instrument, Interest Rate During Period				3.76%
Reallocation of Credit Facilities Debt from General Partner				$ 17,557,000	0	$ 13,682,000
Unamortized fair market adjustment				0	6,200,000
United Dominion Reality L.P. | Fixed Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 279,333,000	708,534,000
Debt Instrument, Interest Rate During Period				4.90%
United Dominion Reality L.P. | Variable Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 196,631,000	218,950,000
Debt Instrument, Interest Rate During Period				1.74%
United Dominion Reality L.P. | Fannie Mae
Debt Instrument [Line Items]
Borrowings outstanding				$ 421,031,000	526,588,000
United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				5.08%
United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period				1.90%
United Dominion Reality L.P. | Mortgages [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 30,132,000	378,371,000
Debt Instrument, Interest Rate During Period				3.43%
Notes payable minimum interest rates range				3.43%
United Dominion Reality L.P. | Tax-exempt secured notes payable | Variable Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 27,000,000	27,000,000
Debt Instrument, Interest Rate During Period				0.76%
Debt Instrument, Maturity Date Range, End				Mar. 1, 2032
United Dominion Reality L.P. | 2.90% Term Notes due January 2016 | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity				$ 250,000,000
United Dominion Reality L.P. | 1.68% Term Notes due December 2016 | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity				$ 100,000,000
United Dominion Reality L.P. | 4.25% Medium-Term Notes due June 2018
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End			Jun. 1, 2018
United Dominion Reality L.P. | 4.25% Medium-Term Notes due June 2018 | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
United Dominion Reality L.P. | Three point seven percent medium term note due October 2020 [Member] | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity			300,000,000
United Dominion Reality L.P. | 1.44% Term notes due January 2021 [Member] | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 350,000,000
United Dominion Reality L.P. | 4.63% Medium-Term Notes due January 2022
Debt Instrument [Line Items]
Debt Instrument, Maturity Date Range, End			Jan. 1, 2022
United Dominion Reality L.P. | 4.63% Medium-Term Notes due January 2022 | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 400,000,000
United Dominion Reality L.P. | 3.75 MTN Due July 2024 [Member] | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity			300,000,000
United Dominion Reality L.P. | 4.00% MTN Due October 2025 [Member] | Financial Guarantee
Debt Instrument [Line Items]
Guarantor borrowing capacity			$ 300,000,000
Beginning of range of initial term of debt [Member] | Fannie Mae credit facilities
Debt Instrument [Line Items]
Debt Instrument, Term				7 years
End of range of inital term of debt [Member] | Fannie Mae credit facilities
Debt Instrument [Line Items]
Debt Instrument, Term				10 years
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Fixed Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 514,462,000	568,086,000
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Fannie Mae credit facilities | Variable Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				299,378,000	266,196,000
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				250,828,000	333,828,000
Fannie Mae credit facilities | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				170,203,000	192,760,000
Mortgages [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Fixed Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				442,617,000	401,210,000
Mortgages [Member] | Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Mortgages [Member] | Variable Rate Debt
Debt Instrument [Line Items]
Secured Debt Including Debt on Real Estate Held for Sale				$ 31,337,000	$ 31,337,000

Related Party Transactions (132

Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014
Related Party Transaction [Line Items]
Related party management fees	$ 17,700	$ 12,700	$ 12,300
United Dominion Reality L.P.
Related Party Transaction [Line Items]
Net receivable balances from General Partner	$ 11,270	(13,624)
Related party management fee percentage	2.75%
Notes payable due to General Partner	$ 273,334	88,696
United Dominion Reality L.P. | Taxable REIT Subsidiaries
Related Party Transaction [Line Items]
Related party management fee percentage	2.75%
United Dominion Reality L.P. | UDR, Inc.
Related Party Transaction [Line Items]
General and administrative expenses allocated to the Operating Partnership by UDR	$ 21,000	$ 27,400	$ 23,500
United Dominion Reality L.P. | UDR, Inc. | Bottom Dollar guaranty
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate		5.18%			5.18%
Notes payable due to General Partner	83,200	$ 83,300
United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition
Related Party Transaction [Line Items]
Notes payable due to General Partner	5,500	$ 5,500
Number of OP Units issued as consideration for acquisition guaranteed by related party note payable (in shares)				1,802,239
United Dominion Reality L.P. | UDR, Inc. | Note for 184.6 million [Member]
Related Party Transaction [Line Items]
Notes payable due to General Partner	$ 184,600
Note for 83.2 million [Member] | United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	5.18%
Note for 5 million [Member] | United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	5.34%
Note for 184.6 million [Member] | United Dominion Reality L.P. | UDR, Inc. | Guaranty related to community acquisition
Related Party Transaction [Line Items]
Related party guaranty note payable interest rate	4.12%

Fair Value of Derivatives an133

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Carrying Amount | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	$ 16,707	$ 14,457
Secured debt instruments - variable rate
Total liabilities	3,590,829	3,593,473
Fair Value | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	16,951	14,896
Secured debt instruments - variable rate
Total liabilities	3,673,283	3,721,512
Fair Value | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	13	88
Derivatives - Interest rate contracts	2,112	10,368
Fair Value | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	448,019	415,663
Secured debt instruments - variable rate
Secured debt instruments - variable rate	31,337	31,337
Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700	94,700
Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	539,050	606,623
Secured debt instruments - variable rate
Secured debt instruments - variable rate	299,378	266,196
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	0	0
Secured debt instruments - variable rate
Total liabilities	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Derivatives - Interest rate contracts	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	13	88
Secured debt instruments - variable rate
Total liabilities	2,112	10,368
Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	13	88
Derivatives - Interest rate contracts	2,112	10,368
Fair Value | Significant Other Observable Inputs (Level 2) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Other Observable Inputs (Level 2) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	16,938	14,808
Secured debt instruments - variable rate
Total liabilities	3,671,171	3,711,144
Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Derivatives - Interest rate contracts	0	0
Fair Value | Significant Unobservable Inputs (Level 3) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	448,019	415,663
Secured debt instruments - variable rate
Secured debt instruments - variable rate	31,337	31,337
Fair Value | Significant Unobservable Inputs (Level 3) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	94,700	94,700
Fair Value | Significant Unobservable Inputs (Level 3) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	539,050	606,623
Secured debt instruments - variable rate
Secured debt instruments - variable rate	299,378	266,196
United Dominion Reality L.P.
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8	39
Derivatives - Interest rate contracts	0	918
United Dominion Reality L.P. | Carrying Amount | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	8	39
Secured debt instruments - variable rate
Total liabilities	478,163	932,877
United Dominion Reality L.P. | Carrying Amount | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8	39
Derivatives - Interest rate contracts		918
United Dominion Reality L.P. | Carrying Amount | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	30,132	378,371
United Dominion Reality L.P. | Carrying Amount | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	27,000	27,000
United Dominion Reality L.P. | Carrying Amount | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	250,828	333,828
Secured debt instruments - variable rate
Secured debt instruments - variable rate	170,203	192,760
United Dominion Reality L.P. | Fair Value | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	8	39
Secured debt instruments - variable rate
Total liabilities	490,581	967,983
United Dominion Reality L.P. | Fair Value | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8	39
Derivatives - Interest rate contracts		918
United Dominion Reality L.P. | Fair Value | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	30,308	391,835
United Dominion Reality L.P. | Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	27,000	27,000
United Dominion Reality L.P. | Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	263,070	355,470
Secured debt instruments - variable rate
Secured debt instruments - variable rate	170,203	192,760
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	0	0
Secured debt instruments - variable rate
Total liabilities	0	0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Derivatives - Interest rate contracts		0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	8	39
Secured debt instruments - variable rate
Total liabilities	0	918
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8	39
Derivatives - Interest rate contracts		918
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	0	0
Secured debt instruments - variable rate
Secured debt instruments - variable rate	0	0
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Total assets	0	0
Secured debt instruments - variable rate
Total liabilities	490,581	967,065
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Interest rate contracts | Fair Value, Measurements, Recurring
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	0
Derivatives - Interest rate contracts		0
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Mortgages [Member] | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	30,308	391,835
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring
Secured debt instruments - variable rate
Secured debt instruments - variable rate	27,000	27,000
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Fannie Mae credit facilities | Fair Value, Measurements, Recurring
Secured debt instruments - fixed rate
Secured debt instruments - fixed rate	263,070	355,470
Secured debt instruments - variable rate
Secured debt instruments - variable rate	$ 170,203	$ 192,760

Derivatives and Hedging Acti134

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	Dec. 31, 2015USD ($)instruments
Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Number of Instruments	5
Derivative, Notional Amount	$ 315,000
Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments	2
Derivative, Notional Amount	$ 203,166
Not Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments | instruments	3
Derivative, Notional Amount	$ 133,107
United Dominion Reality L.P. | Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments	1
Derivative, Notional Amount	$ 96,327
United Dominion Reality L.P. | Not Designated as Hedging Instrument | Interest rate caps
Derivative [Line Items]
Number of Instruments | instruments	3
Derivative, Notional Amount	$ 98,932

Derivatives and Hedging Acti135

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 1) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Interest rate products | Other Assets [Member] | Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	$ 9	$ 86
Interest rate products | Other Assets [Member] | Not Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Not Designated as Hedging Instrument, Fair Value	4	2
Interest rate products | Other liabilities | Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Designated as Hedging Instrument, Fair Value	2,112	10,368
Interest rate products | Other liabilities | Not Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Not Designated as Hedging Instrument, Fair Value	0	0
United Dominion Reality L.P.
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	8	39
Derivative Liability Designated as Hedging Instrument, Fair Value	0	918
United Dominion Reality L.P. | Interest rate products | Other Assets [Member] | Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Designated as Hedging Instrument, Fair Value	4	37
United Dominion Reality L.P. | Interest rate products | Other Assets [Member] | Not Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Asset Not Designated as Hedging Instrument, Fair Value	4	2
United Dominion Reality L.P. | Interest rate products | Other liabilities | Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Designated as Hedging Instrument, Fair Value	0	918
United Dominion Reality L.P. | Interest rate products | Other liabilities | Not Designated as Hedging Instrument
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]
Derivative Liability Not Designated as Hedging Instrument, Fair Value	$ 0	$ 0

Derivatives and Hedging Acti136

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	$ (23)	$ (4)	$ 271
Interest rate products | Interest expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	(2,251)	(4,834)	(6,851)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	(11)	3	0
United Dominion Reality L.P.
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	1,044	2,275	2,652
United Dominion Reality L.P. | Interest rate products | Other Income Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	(23)	(3)	(9)
United Dominion Reality L.P. | Interest rate products | Interest expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total			(348)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	(1,044)	(2,275)	(3,431)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ (11)	$ 0	$ 0

Derivatives and Hedging Acti137

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total	$ (6,393)	$ (8,695)	$ (469)
Derivative, Collateral, Obligation to Return Securities	0	27
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	13	61
Derivative Asset, Not Subject to Master Netting Arrangement	0	0
Derivative Asset	13	88
United Dominion Reality L P [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total	(82)	(285)	(348)
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	8	39
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	8	39
Derivative Asset, Not Subject to Master Netting Arrangement	0	0
Derivative Asset	$ 8	$ 39
Interest rate contracts | Cash Flow Hedging
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total			$ (469)

Derivatives and Hedging Acti138

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 4) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Liability	$ 2,112	$ 10,368
Derivative, Collateral, Right to Reclaim Securities	0	27
Derivative Liability, Fair Value, Amount Offset Against Collateral	2,112	10,341
Derivative Liability, Not Subject to Master Netting Arrangement	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
United Dominion Reality L.P.
Derivative [Line Items]
Derivative Liability	0	918
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	918
Derivative Liability Designated as Hedging Instrument, Fair Value	0	918
Derivative Liability, Not Subject to Master Netting Arrangement	0	0
Derivative, Collateral, Right to Reclaim Cash	$ 0	$ 0

Derivatives and Hedging Acti139

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Entity Information [Line Items]
Derivative, Collateral, Obligation to Return Cash	$ 0	$ 0
Losses in the fair value of derivatives not designated in hedging relationships	23,000	4,000	$ (271,000)
Payment required to pay for contract termination	2,200,000
United Dominion Reality L.P.
Entity Information [Line Items]
Derivative, Collateral, Obligation to Return Cash	0	0
Fair value of derivatives in a net liability position	0
Interest rate contracts | Other Income Expense [Member] | United Dominion Reality L.P.
Entity Information [Line Items]
Losses in the fair value of derivatives not designated in hedging relationships	23,000	3,000	9,000
Cash Flow Hedging | Interest rate contracts | Interest expense
Entity Information [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	(11,000)	3,000	0
Cash Flow Hedging | Interest rate contracts | Interest expense | United Dominion Reality L.P.
Entity Information [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	$ (11,000)	$ 0	$ 0

Capital Structure (UNITED DO140

Capital Structure (UNITED DOMINION REALTY, L.P.) (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Limited Partners' Capital Account [Line Items]
Balance	183,278,698	183,278,698	184,281,254
Partners' Capital Account, Units, Redeemed	0	0	0
OP Units issued for acquisitions of real estate			(1,002,556)
Balance	183,278,698	183,278,698	183,278,698
UDR, Inc.
Limited Partners' Capital Account [Line Items]
Balance	174,002,342
Balance	174,114,516	174,002,342
Class A Limited Partner
Limited Partners' Capital Account [Line Items]
Balance	1,751,671
Limited Partner
Limited Partners' Capital Account [Line Items]
Balance	7,413,802	7,567,253	7,643,548
Partners' Capital Account, Units, Redeemed	(112,174)	(153,451)	(76,295)
OP Units issued for acquisitions of real estate			0
Balance	7,301,628	7,413,802	7,567,253
Limited Partner | UDR, Inc.
Limited Partners' Capital Account [Line Items]
Limited Partners' Capital Account, Units Redeemed		1,002,556
Balance	174,002,342	173,848,891	174,775,152
Partners' Capital Account, Units, Redeemed	(112,174)	(153,451)	(76,295)
OP Units issued for acquisitions of real estate			(1,002,556)
Balance	174,114,516	174,002,342	173,848,891
Limited Partner | Class A Limited Partner
Limited Partners' Capital Account [Line Items]
Balance	1,751,671	1,751,671	1,751,671
Partners' Capital Account, Units, Redeemed	0	0	0
OP Units issued for acquisitions of real estate			0
Balance	1,751,671	1,751,671	1,751,671
General Partner | UDR, Inc.
Limited Partners' Capital Account [Line Items]
Balance	110,883	110,883	110,883
Partners' Capital Account, Units, Redeemed	0	0	0
OP Units issued for acquisitions of real estate			0
Balance	110,883	110,883	110,883

Capital Structure (UNITED DO141

Capital Structure (UNITED DOMINION REALTY, L.P.) (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	183,278,698	183,278,698	183,278,698	184,281,254
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	$ 946,436	$ 282,480	$ 217,597
United Dominion Reality L.P.
Limited Partners' Capital Account [Line Items]
General Partners' Capital Account, Units Outstanding	110,883	110,883
Limited partnership units owned	183,167,815	183,167,815
Required period to be outstanding before unit is redeemable	1 year
Redeemable non-controlling interests in the Operating Partnership and DownREIT Partnership	$ 340,100
UDR, Inc.
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	174,114,516	174,002,342
Percentage of units	95.10%	95.00%
Non-affiliated Partners
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	9,053,299	9,165,473
Percentage of units	4.90%	5.00%
Class A Limited Partner
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	1,751,671
Cumulative, annual, non-compounded preferred return on Class A Partnership units	8.00%
Value of Class A Partnership units (in dollars per share)	$ 16.61
Class A Limited Partner | United Dominion Reality L.P.
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	1,873,332	1,751,671
Limited Partner [Member]
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	7,301,628	7,413,802	7,567,253	7,643,548
Limited Partner [Member] | UDR, Inc.
Limited Partners' Capital Account [Line Items]
Limited Partners' Capital Account, Units Redeemed		1,002,556
Limited partnership units owned	174,114,516	174,002,342	173,848,891	174,775,152
Limited Partner [Member] | Class A Limited Partner
Limited Partners' Capital Account [Line Items]
Limited partnership units owned	1,751,671	1,751,671	1,751,671	1,751,671
Partnership Capital [Member] | United Dominion Reality L.P.
Limited Partners' Capital Account [Line Items]
OP Units issued for real estate		$ 23,300

Income_(Loss) Per Share (UNI142

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest															$ 48
Income (Loss) from Continuing Operations Attributable to Parent													$ 340,383	$ 154,324	2,448
Income/(loss) from discontinued operations									$ 0	$ 79	$ 18	$ (87)	0	10	43,942
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest													357,159	159,842	46,282
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest													16,468	5,375	1,720
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest													0	0	(1,578)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent													0	10	42,364
United Dominion Reality L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Parent													213,301	96,227	28,652
Income/(loss) from discontinued operations													0	0	45,176
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest													215,063	97,179	77,942
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest													$ 1,762	$ 952	$ 4,566
Weighted Average Number of Limited Partnership and General Partnership Unit Outstanding, Basic and Diluted													183,279	183,279	184,196
Income (Loss) from Continuing Operations, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax													$ 1.16	$ 0.53	$ 0.16
Income (Loss) from Discontinued Operations, Net of Tax, Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted													0	0	0.24
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax	$ 0.62		$ 0.08		$ 0.26		$ 0.20		$ 0.18	$ 0.05	$ 0.13	$ 0.17	$ 1.16	$ 0.53	$ 0.40
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest													$ 0	$ 0	$ (452)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent													$ 0	$ 0	44,724
Noncontrolling Interest | United Dominion Reality L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest															$ (4,114)
[1]	Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts

Commitments and Contingencie143

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015USD ($)Communities	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2015	Dec. 31, 2015USD ($)
Real Estate Properties [Line Items]
Number of Real Estate Properties		133			2
Costs Incurred to Date						$ 859,798
Expected Costs to Complete	[1]					319,316
United Dominion Reality L.P.
Real Estate Properties [Line Items]
Development costs and capital expenditures Incurred but not yet paid		$ 3,118	$ 7,254	$ 6,371
Number of Real Estate Properties | Communities		57
Ground Leases [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Communities		6
2,015						5,444
2,016						5,444
2,017						4,486
2,018						5,444
2,019						5,444
Thereafter						311,858
Rent expense		$ 5,500	5,400	5,200
Ground Leases [Member] | United Dominion Reality L.P.
Real Estate Properties [Line Items]
Number of Real Estate Properties | Communities		5
2,015						5,400
2,016						5,400
2,017						4,500
2,018						5,400
2,019						5,400
Thereafter						311,900
Rent expense		$ 5,400	$ 5,300	$ 5,100
Wholly-owned — redevelopment
Real Estate Properties [Line Items]
Development costs and capital expenditures Incurred but not yet paid		1,200
Number of Real Estate Properties					3
Costs Incurred to Date						11,302
Purchase Commitment, Remaining Minimum Amount Committed						16,698
Wholly-owned — redevelopment | United Dominion Reality L.P.
Real Estate Properties [Line Items]
Development costs and capital expenditures Incurred but not yet paid		$ 700
Number of Real Estate Properties					2
Costs Incurred to Date						10,093
Purchase Commitment, Remaining Minimum Amount Committed						$ 13,907
[1]	Represents 100% of project costs incurred to date.

Reportable Segments (UNITED 144

Reportable Segments (UNITED DOMINION REALTY, L.P.) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2015USD ($)Segments	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Reportable Segment (Textual) [Abstract]
Number of reportable segments | Segments									2
Condition for Community considered to have stabilized occupancy									0.9
Number of tenants or related group of tenants that contributed 10% or more of company total revenue									0	0	0
Reportable apartment home segment rental income									$ 894,638	$ 818,046	$ 758,926
Reportable apartment home segment NOI									613,869	556,321	514,041
Reconciling items:
Property management									(23,978)	(22,142)	(20,780)
Other operating expenses									(9,708)	(8,271)	(7,136)
Segment Reporting Reconciling Items Cost of Services Depreciation and Amortization									374,598	358,154	341,490
Gain/(loss) on sales of real estate owned, net of tax									251,677	143,572	0
General and administrative									(59,690)	(47,800)	(42,238)
Casualty-related (recoveries)/charges, net									(2,335)	(541)	12,253
Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable									(3)	3	60
Net income/(loss) attributable to Entity									340,383	154,334	44,812
Reportable apartment home segment assets:
Total segment assets	$ 9,190,276				$ 8,383,259				9,190,276	8,383,259
Real Estate Investment Property, Accumulated Depreciation	2,646,044				2,434,772				2,646,044	2,434,772
Accumulated depreciation	(2,646,874)				(2,434,772)				(2,646,874)	(2,434,772)
Total real estate owned, net of accumulated depreciation	6,543,402				5,948,487				6,543,402	5,948,487
Reconciling items:
Cash and cash equivalents	6,742				15,224				6,742	15,224	30,249	$ 12,115
Deferred financing costs, net					0					0
Other assets	137,302				110,082				137,302	110,082
Total assets	7,663,844				6,828,728				7,663,844	6,828,728
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									203,183	326,461	452,057
Income/(loss) from unconsolidated entities									62,329	(7,006)	(415)
Interest Expense									(121,875)	(130,454)	(126,083)
Investment in and advances to unconsolidated joint ventures, net	938,906				718,226				938,906	718,226
Same Communities
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									72,300	52,500	43,000
Same Communities Western Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									255,346	236,175	214,324
Reportable apartment home segment NOI									190,682	171,973	152,108
Reportable apartment home segment assets:
Total segment assets	2,371,615				2,336,271				2,371,615	2,336,271
Same Communities Mid-Atlantic Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									157,158	154,491	150,489
Reportable apartment home segment NOI									108,324	107,592	105,300
Reportable apartment home segment assets:
Total segment assets	1,423,888				1,440,561				1,423,888	1,440,561
Same Communities Northeast Region [Member]
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									86,048	81,500	77,299
Reportable apartment home segment NOI									64,539	61,315	57,350
Reportable apartment home segment assets:
Total segment assets	1,109,354				1,076,656				1,109,354	1,076,656
Same Communities Southeastern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									103,920	98,061	93,479
Reportable apartment home segment NOI									69,820	65,053	61,087
Reportable apartment home segment assets:
Total segment assets	730,060				727,933				730,060	727,933
Same Communities Southwestern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									57,670	54,810	52,302
Reportable apartment home segment NOI									35,767	33,725	31,925
Reportable apartment home segment assets:
Total segment assets	450,305				440,587				450,305	440,587
Non-Mature communities/Other
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									211,786	180,112	167,743
Reportable apartment home segment NOI									144,737	116,663	106,271
Reportable apartment home segment assets:
Total segment assets	3,105,054				2,361,251				3,105,054	2,361,251
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									$ 12,900	10,900	$ 12,800
United Dominion Reality L.P.
Reportable Segment (Textual) [Abstract]
Related party management fee percentage									2.75%
Number of reportable segments | Segments									2
Number of tenants or related group of tenants that contributed 10% or more of company total revenue									0		0
Reportable apartment home segment rental income									$ 440,408	422,634	$ 410,842
Reportable apartment home segment NOI									317,597	300,313	287,535
Reconciling items:
Property management									(12,111)	(11,622)	(11,298)
Other operating expenses									(5,923)	(5,172)	(5,728)
Segment Reporting Reconciling Items Cost of Services Depreciation and Amortization									169,784	179,176	181,302
Gain/(loss) on sales of real estate owned, net of tax									158,123	63,635	0
General and administrative									(27,016)	(28,541)	(24,808)
Casualty-related (recoveries)/charges, net									(843)	(541)	8,083
Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable									(1,762)	(952)	(4,566)
Net income/(loss) attributable to Entity	114,955	$ 14,617	$ 47,383	$ 36,346	32,631	$ 8,637	$ 24,426	$ 30,533	213,301	96,227	73,376
Reportable apartment home segment assets:
Total segment assets	3,630,905				4,238,770				3,630,905	4,238,770
Real Estate Investment Property, Accumulated Depreciation	1,281,258				1,403,303				1,281,258	1,403,303
Total real estate owned, net of accumulated depreciation	2,349,647				2,835,467				2,349,647	2,835,467
Reconciling items:
Cash and cash equivalents	3,103				502				3,103	502	1,897	$ 2,804
Deferred financing costs, net	(2,199)				(4,500)				(2,199)	(4,500)
Other assets	24,528				24,029				24,528	24,029
Total assets	2,554,808				2,873,809				2,554,808	2,873,809
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									61,196	91,682	151,002
Income/(loss) from unconsolidated entities									(4,659)	0	0
Interest Expense									(40,321)	(41,717)	(36,058)
Net (loss)/gain on sale of depreciable property									158,123	63,635	41,518
Restricted cash	11,344				13,811				11,344	13,811
Investment in and advances to unconsolidated joint ventures, net	166,186				0				166,186	0
United Dominion Reality L.P. | Same-Store [Member]
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									40,000	30,600
United Dominion Reality L.P. | Same Communities Western Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									174,414	160,185	150,137
Reportable apartment home segment NOI									130,509	117,130	107,866
Reportable apartment home segment assets:
Total segment assets	1,461,078				1,433,827				1,461,078	1,433,827
United Dominion Reality L.P. | Same Communities Mid-Atlantic Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									60,602	65,565	64,923
Reportable apartment home segment NOI									40,301	44,366	44,442
Reportable apartment home segment assets:
Total segment assets	410,710				686,708				410,710	686,708
United Dominion Reality L.P. | Same Communities Northeast Region [Member]
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									59,444	58,788	55,850
Reportable apartment home segment NOI									45,917	45,347	42,146
Reportable apartment home segment assets:
Total segment assets	669,082				777,375				669,082	777,375
United Dominion Reality L.P. | Same Communities Southeastern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									44,981	42,568	40,730
Reportable apartment home segment NOI									30,106	28,111	26,590
Reportable apartment home segment assets:
Total segment assets	321,787				316,788				321,787	316,788
United Dominion Reality L.P. | Same Communities Southwestern Region
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									20,963	26,580	25,614
Reportable apartment home segment NOI									13,176	16,821	16,057
Reportable apartment home segment assets:
Total segment assets	0				228,997				0	228,997
United Dominion Reality L.P. | Non-Mature communities/Other
Reportable Segment (Textual) [Abstract]
Reportable apartment home segment rental income									80,004	68,948	73,588
Reportable apartment home segment NOI									57,588	48,538	$ 50,434
Reportable apartment home segment assets:
Total segment assets	$ 768,248				$ 795,075				768,248	795,075
Reportable Segments Additional (Textual) [Abstract]
Capital expenditures related to segments									$ 5,000	$ 3,200
United Dominion Reality L.P. | Minimum
Reportable Segment (Textual) [Abstract]
Percent occupancy to be considered a community									90.00%
Community Threshold, Period Above Occupancy Threshold									3 months

Hurricane Related Charges (U145

Hurricane Related Charges (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Hurricane Related Charges [Line Items]
Casualty-related (recoveries)/charges, net	$ (2,335)	$ (541)	$ 12,253
United Dominion Reality L.P.
Hurricane Related Charges [Line Items]
Casualty-related (recoveries)/charges, net	$ (843)	$ (541)	$ 8,083

Unaudited Summarized Consoli146

Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended												12 Months Ended
		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data [Abstract]
Rental income	[1]	$ 234,352		$ 217,765		$ 212,764		$ 207,047		$ 206,104	$ 203,587	$ 200,959	$ 194,352
Income/(loss) from continuing operations		4,528		13,695		10,842		76,417		6,485	10,611	4,359	(5,195)	$ 105,482	$ 16,260	$ 2,340
Income/(loss) from discontinued operations										0	79	18	(87)	0	10	43,942
Net income/(loss) attributable to Entity														340,383	154,334	44,812
Net (loss)/income attributable to stakeholders		161,270		12,361		85,924		72,891		$ 64,486	$ 39,618	$ 29,076	$ 17,430	336,661	150,610	41,088
Earnings per weighted average common share - basic and diluted:
Net (loss)/income attributable to common stockholders — basic and diluted (in dollars per share)	[2]									$ 0.25	$ 0.16	$ 0.12	$ 0.07
United Dominion Reality L.P.
Quarterly Financial Data [Abstract]
Rental income		101,982		115,173		113,158		110,095		$ 107,978	$ 107,444	$ 104,842	$ 102,370	440,408	422,634	401,853
Income/(loss) from continuing operations		14,516		14,952		15,355		12,117		9,939	8,875	8,319	6,411	56,940	33,544	32,766
Income/(loss) from discontinued operations														0	0	45,176
Net income/(loss) attributable to Entity		$ 114,955		$ 14,617		$ 47,383		$ 36,346		$ 32,631	$ 8,637	$ 24,426	$ 30,533	$ 213,301	$ 96,227	$ 73,376
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted		$ 0.62	[3]	$ 0.08	[3]	$ 0.26	[3]	$ 0.20	[3]	$ 0.18	$ 0.05	$ 0.13	$ 0.17	$ 1.16	$ 0.53	$ 0.40
[1]	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
[2]	.
[3]	Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts

Schedule - III Real Estate O147

Schedule - III Real Estate Owned (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Real Estate and Accumulated Depreciation [Line Items]
Deferred Finance Costs, Net						$ 0
Total Carrying Value		$ 8,383,259	$ 8,207,977	$ 8,055,828	$ 9,190,276	8,383,259
Accumulated Depreciation		2,434,772	2,208,794	1,924,682	2,646,874	$ 2,434,772
Aggregate cost for federal income tax purposes					8,300,000
Real Estate Owned, Gross [Roll Forward]
Balance at beginning of the year		8,383,259	8,207,977	8,055,828
Real estate acquired		906,446	231,225	0
Capital expenditures and development		203,183	326,461	452,057
Real estate sold		(301,920)	(269,681)	(70,687)
Hurricane related impairment of assets		(692)	(379)	(2,355)
Balance at end of the year		9,190,276	8,383,259	8,207,977
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at beginning of the year		2,434,772	2,208,794	1,924,682
Depreciation expense for the year		364,622	356,673	339,326
Accumulated depreciation on sales		(152,520)	(126,151)	(34,794)
Accumulated depreciation on retirements of fully depreciated assets		0	0	(1,132)
SEC Schedule III, Real Estate Accumulated Depreciation, Other Additions		0	0	1,374
Write off of accumulated depreciation on hurricane related impaired assets		0	(316)	0
Balance at end of year		$ 2,646,874	2,434,772	2,208,794
Estimated depreciable lives of buildings range beginning
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life for all buildings		35 years
Estimated depreciable lives of buildings range end
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life for all buildings		55 years
Total Operating Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					1,370,739
Initial Costs, Land and Land Improvements					1,697,251
Initial Costs, Buildings and Improvements					4,850,356
Total Initial Acquisition Costs					6,547,607
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,332,450
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,899,820
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,980,237
Total Carrying Value		$ 8,880,057			8,880,057
Accumulated Depreciation		2,625,914			2,625,914
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		8,880,057
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,625,914
Other
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	[1]				0
Initial Costs, Land and Land Improvements	[1]				0
Initial Costs, Buildings and Improvements	[1]				0
Total Initial Acquisition Costs	[1]				0
Costs of Improvements Capitalized Subsequent to Acquisition Costs	[1]				5,356
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	[1]				0
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	[1]				5,356
Total Carrying Value	[1]	5,356			5,356
Accumulated Depreciation	[1]	62			62
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year	[1]	5,356
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year	[1]	62
1745 Shea [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	[1]				11,755
Initial Costs, Land and Land Improvements	[1]				3,034
Initial Costs, Buildings and Improvements	[1]				20,534
Total Initial Acquisition Costs	[1]				23,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs	[1]				737
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	[1]				3,034
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	[1]				21,271
Total Carrying Value	[1]	24,305			24,305
Accumulated Depreciation	[1]	629			629
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year	[1]	24,305
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year	[1]	629
TOTAL CORPORATE
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					11,755
Initial Costs, Land and Land Improvements					3,034
Initial Costs, Buildings and Improvements					20,534
Total Initial Acquisition Costs					23,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,093
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,034
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					26,627
Total Carrying Value		29,661			29,661
Accumulated Depreciation		691			691
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		29,661
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		691
Real Estate Under Development
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					78,085
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					78,085
Costs of Improvements Capitalized Subsequent to Acquisition Costs					45,987
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					78,085
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					45,987
Total Carrying Value		124,072			124,072
Accumulated Depreciation		0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		124,072
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		0
Real Estate Under Development | Pacific City [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					78,085
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					78,085
Costs of Improvements Capitalized Subsequent to Acquisition Costs					45,987
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					78,085
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					45,987
Total Carrying Value		124,072			124,072
Accumulated Depreciation		0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		124,072
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		0
Land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					56,782
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					56,782
Costs of Improvements Capitalized Subsequent to Acquisition Costs					23,838
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					63,923
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,697
Total Carrying Value		80,620			80,620
Accumulated Depreciation		2,935			2,935
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		80,620
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,935
Land | 2919 Wilshire
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,773
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					6,773
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,563
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,773
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,563
Total Carrying Value		8,336			8,336
Accumulated Depreciation		553			553
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		8,336
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		553
Land | 7 Hardcourt
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					884
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					884
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,045
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					804
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					5,125
Total Carrying Value		5,929			5,929
Accumulated Depreciation		0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		5,929
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		0
Land | 345 Harrison Street [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					32,938
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					32,938
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,437
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					32,943
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					7,432
Total Carrying Value		40,375			40,375
Accumulated Depreciation		0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,375
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		0
Land | Waterside
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					11,862
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					11,862
Costs of Improvements Capitalized Subsequent to Acquisition Costs					283
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					12,084
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					61
Total Carrying Value		12,145			12,145
Accumulated Depreciation		284			284
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		12,145
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		284
Land | Vitruvian
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,325
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					4,325
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,510
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,319
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,516
Total Carrying Value		13,835			13,835
Accumulated Depreciation		2,098			2,098
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,835
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,098
Real Estate Held for Disposition [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,963
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					9,963
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,643
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,963
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,643
Total Carrying Value		12,606			12,606
Accumulated Depreciation		830			830
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		12,606
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		830
Real Estate Held for Disposition [Member] | 3032 Wilshire
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,963
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					9,963
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,643
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,963
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,643
Total Carrying Value		12,606			12,606
Accumulated Depreciation		830			830
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		12,606
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		830
Commercial Held for Development
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					32,351
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					32,351
Costs of Improvements Capitalized Subsequent to Acquisition Costs					30,909
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					40,197
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					23,063
Total Carrying Value		63,260			63,260
Accumulated Depreciation		16,504			16,504
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,260
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,504
Commercial Held for Development | Hanover Village
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,624
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					1,624
Costs of Improvements Capitalized Subsequent to Acquisition Costs					0
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,104
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					520
Total Carrying Value		1,624			1,624
Accumulated Depreciation		553			553
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,624
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		553
Commercial Held for Development | Circle Towers Office Bldg
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,407
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					1,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,021
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,380
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,048
Total Carrying Value		7,428			7,428
Accumulated Depreciation		2,683			2,683
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		7,428
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,683
Commercial Held for Development | Brookhaven Shopping Center
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,943
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					4,943
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,785
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,793
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					13,935
Total Carrying Value		21,728			21,728
Accumulated Depreciation		12,496			12,496
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		21,728
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,496
Commercial Held for Development | Bellevue Plaza retail
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					24,377
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					24,377
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,103
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					29,920
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,560
Total Carrying Value		32,480			32,480
Accumulated Depreciation		772			772
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		32,480
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		772
Commercial Held for Development | TOTAL COMMERCIAL & CORPORATE
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					11,755
Initial Costs, Land and Land Improvements					35,385
Initial Costs, Buildings and Improvements					20,534
Total Initial Acquisition Costs					55,919
Costs of Improvements Capitalized Subsequent to Acquisition Costs					37,002
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					43,231
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					49,690
Total Carrying Value		92,921			92,921
Accumulated Depreciation		17,195			17,195
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		92,921
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		17,195
Commercial Held for Development | Total Real Estate Owned
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					1,376,945
Initial Costs, Land and Land Improvements					1,877,466
Initial Costs, Buildings and Improvements					4,870,890
Total Initial Acquisition Costs					6,748,356
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,441,920
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,095,022
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					7,095,254
Total Carrying Value		9,190,276			9,190,276
Accumulated Depreciation		2,646,874			2,646,874
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,190,276
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,646,874
Western Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					466,881
Initial Costs, Land and Land Improvements					804,897
Initial Costs, Buildings and Improvements					1,504,019
Total Initial Acquisition Costs					2,308,916
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,019,059
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					883,471
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,444,504
Total Carrying Value		3,327,975			3,327,975
Accumulated Depreciation		1,037,095			1,037,095
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		3,327,975
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,037,095
Western Region | Harbor at Mesa Verde
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					61,050
Initial Costs, Land and Land Improvements					20,476
Initial Costs, Buildings and Improvements					28,538
Total Initial Acquisition Costs					49,014
Costs of Improvements Capitalized Subsequent to Acquisition Costs					14,641
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,314
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					42,341
Total Carrying Value		63,655			63,655
Accumulated Depreciation		27,697			27,697
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,655
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,697
Western Region | 27 Seventy FIve Mesa Verde [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,423
Initial Costs, Land and Land Improvements					99,329
Initial Costs, Buildings and Improvements					110,644
Total Initial Acquisition Costs					209,973
Costs of Improvements Capitalized Subsequent to Acquisition Costs					92,673
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					112,650
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					189,996
Total Carrying Value		302,646			302,646
Accumulated Depreciation		87,007			87,007
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		302,646
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		87,007
Western Region | Pacific Shores
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					42,552
Initial Costs, Land and Land Improvements					7,345
Initial Costs, Buildings and Improvements					22,624
Total Initial Acquisition Costs					29,969
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,913
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,913
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,969
Total Carrying Value		39,882			39,882
Accumulated Depreciation		20,771			20,771
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		39,882
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,771
Western Region | Huntington Vista
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,980
Initial Costs, Land and Land Improvements					8,055
Initial Costs, Buildings and Improvements					22,486
Total Initial Acquisition Costs					30,541
Costs of Improvements Capitalized Subsequent to Acquisition Costs					11,612
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,713
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,440
Total Carrying Value		42,153			42,153
Accumulated Depreciation		19,810			19,810
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		42,153
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,810
Western Region | Missions at Back Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					229
Initial Costs, Buildings and Improvements					14,129
Total Initial Acquisition Costs					14,358
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,526
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,874
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,010
Total Carrying Value		16,884			16,884
Accumulated Depreciation		4,229			4,229
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		16,884
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,229
Western Region | Coronado at Newport — North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					62,516
Initial Costs, Buildings and Improvements					46,082
Total Initial Acquisition Costs					108,598
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,014
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					66,770
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					70,842
Total Carrying Value		137,612			137,612
Accumulated Depreciation		44,814			44,814
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		137,612
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		44,814
Western Region | Vista Del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,670
Initial Costs, Buildings and Improvements					7,080
Total Initial Acquisition Costs					17,750
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,502
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,988
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					9,264
Total Carrying Value		20,252			20,252
Accumulated Depreciation		6,117			6,117
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,252
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,117
Western Region | Foxborough
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					12,071
Initial Costs, Buildings and Improvements					6,187
Total Initial Acquisition Costs					18,258
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,897
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					12,404
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,751
Total Carrying Value		21,155			21,155
Accumulated Depreciation		5,432			5,432
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		21,155
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,432
Western Region | Coronado South
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					58,785
Initial Costs, Buildings and Improvements					50,067
Total Initial Acquisition Costs					108,852
Costs of Improvements Capitalized Subsequent to Acquisition Costs					19,393
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					59,278
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					68,967
Total Carrying Value		128,245			128,245
Accumulated Depreciation		43,476			43,476
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		128,245
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		43,476
Western Region | 1818 Platinum Triangle
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					16,663
Initial Costs, Buildings and Improvements					51,905
Total Initial Acquisition Costs					68,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,488
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,822
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					53,234
Total Carrying Value		70,056			70,056
Accumulated Depreciation		16,975			16,975
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		70,056
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,975
Western Region | Beach & Ocean [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					12,878
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					12,878
Costs of Improvements Capitalized Subsequent to Acquisition Costs					38,710
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					13,007
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					38,581
Total Carrying Value		51,588			51,588
Accumulated Depreciation		2,841			2,841
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		51,588
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,841
Western Region | ORANGE COUNTY, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					177,005
Initial Costs, Land and Land Improvements					351,315
Initial Costs, Buildings and Improvements					359,742
Total Initial Acquisition Costs					711,057
Costs of Improvements Capitalized Subsequent to Acquisition Costs					421,532
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					382,189
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					750,400
Total Carrying Value		1,132,589			1,132,589
Accumulated Depreciation		307,438			307,438
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,132,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		307,438
Western Region | 2000 Post Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,861
Initial Costs, Buildings and Improvements					44,578
Total Initial Acquisition Costs					54,439
Costs of Improvements Capitalized Subsequent to Acquisition Costs					30,040
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					13,541
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					70,938
Total Carrying Value		84,479			84,479
Accumulated Depreciation		31,789			31,789
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		84,479
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		31,789
Western Region | Birch Creek
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,365
Initial Costs, Buildings and Improvements					16,696
Total Initial Acquisition Costs					21,061
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,536
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,139
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					23,458
Total Carrying Value		28,597			28,597
Accumulated Depreciation		13,756			13,756
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		28,597
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,756
Western Region | Highlands Of Marin
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,996
Initial Costs, Buildings and Improvements					24,868
Total Initial Acquisition Costs					30,864
Costs of Improvements Capitalized Subsequent to Acquisition Costs					26,063
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,257
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					49,670
Total Carrying Value		56,927			56,927
Accumulated Depreciation		29,237			29,237
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		56,927
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		29,237
Western Region | Marina Playa
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,224
Initial Costs, Buildings and Improvements					23,916
Total Initial Acquisition Costs					30,140
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,032
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,938
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,234
Total Carrying Value		40,172			40,172
Accumulated Depreciation		19,547			19,547
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,172
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,547
Western Region | River Terrace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,310
Initial Costs, Land and Land Improvements					22,161
Initial Costs, Buildings and Improvements					40,137
Total Initial Acquisition Costs					62,298
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,307
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					22,428
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					44,177
Total Carrying Value		66,605			66,605
Accumulated Depreciation		25,943			25,943
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		66,605
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,943
Western Region | CitySouth
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,031
Initial Costs, Buildings and Improvements					30,537
Total Initial Acquisition Costs					44,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs					35,627
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,290
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					63,905
Total Carrying Value		80,195			80,195
Accumulated Depreciation		36,437			36,437
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		80,195
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		36,437
Western Region | Bay Terrace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,545
Initial Costs, Buildings and Improvements					14,458
Total Initial Acquisition Costs					23,003
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,046
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,458
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,591
Total Carrying Value		28,049			28,049
Accumulated Depreciation		9,622			9,622
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		28,049
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,622
Western Region | Highlands of Marin Phase II
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,353
Initial Costs, Buildings and Improvements					18,559
Total Initial Acquisition Costs					23,912
Costs of Improvements Capitalized Subsequent to Acquisition Costs					11,088
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,758
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					29,242
Total Carrying Value		35,000			35,000
Accumulated Depreciation		15,221			15,221
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		35,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,221
Western Region | Edgewater
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					30,657
Initial Costs, Buildings and Improvements					83,872
Total Initial Acquisition Costs					114,529
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,689
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					30,690
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					87,528
Total Carrying Value		118,218			118,218
Accumulated Depreciation		39,217			39,217
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		118,218
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		39,217
Western Region | Almaden Lake Village
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					27,000
Initial Costs, Land and Land Improvements					594
Initial Costs, Buildings and Improvements					42,515
Total Initial Acquisition Costs					43,109
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,031
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					773
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					48,367
Total Carrying Value		49,140			49,140
Accumulated Depreciation		21,469			21,469
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		49,140
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,469
Western Region | 388 Beale
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,253
Initial Costs, Buildings and Improvements					74,104
Total Initial Acquisition Costs					88,357
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,271
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,316
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					80,312
Total Carrying Value		94,628			94,628
Accumulated Depreciation		21,255			21,255
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		94,628
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,255
Western Region | Channel @ Mission Bay [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					23,625
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					23,625
Costs of Improvements Capitalized Subsequent to Acquisition Costs					128,433
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					23,662
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					128,396
Total Carrying Value		152,058			152,058
Accumulated Depreciation		15,675			15,675
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		152,058
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,675
Western Region | SAN FRANCISCO, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					66,310
Initial Costs, Land and Land Improvements					145,665
Initial Costs, Buildings and Improvements					414,240
Total Initial Acquisition Costs					559,905
Costs of Improvements Capitalized Subsequent to Acquisition Costs					274,163
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					158,250
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					675,818
Total Carrying Value		834,068			834,068
Accumulated Depreciation		279,168			279,168
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		834,068
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		279,168
Western Region | Rosebeach
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,414
Initial Costs, Buildings and Improvements					17,449
Total Initial Acquisition Costs					25,863
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,450
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,760
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					20,553
Total Carrying Value		29,313			29,313
Accumulated Depreciation		12,675			12,675
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		29,313
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,675
Western Region | Tierra Del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					43,078
Initial Costs, Land and Land Improvements					39,586
Initial Costs, Buildings and Improvements					36,679
Total Initial Acquisition Costs					76,265
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,250
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					39,674
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					39,841
Total Carrying Value		79,515			79,515
Accumulated Depreciation		18,883			18,883
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		79,515
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		18,883
Western Region | The Westerly
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					67,700
Initial Costs, Land and Land Improvements					48,182
Initial Costs, Buildings and Improvements					102,364
Total Initial Acquisition Costs					150,546
Costs of Improvements Capitalized Subsequent to Acquisition Costs					37,220
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					50,722
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					137,044
Total Carrying Value		187,766			187,766
Accumulated Depreciation		46,474			46,474
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		187,766
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		46,474
Western Region | Jefferson at Marina del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					55,651
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					55,651
Costs of Improvements Capitalized Subsequent to Acquisition Costs					90,660
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					61,455
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					84,856
Total Carrying Value		146,311			146,311
Accumulated Depreciation		32,288			32,288
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		146,311
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		32,288
Western Region | LOS ANGELES, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					110,778
Initial Costs, Land and Land Improvements					151,833
Initial Costs, Buildings and Improvements					156,492
Total Initial Acquisition Costs					308,325
Costs of Improvements Capitalized Subsequent to Acquisition Costs					134,580
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					160,611
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					282,294
Total Carrying Value		442,905			442,905
Accumulated Depreciation		110,320			110,320
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		442,905
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		110,320
Western Region | Crowne Pointe
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,486
Initial Costs, Buildings and Improvements					6,437
Total Initial Acquisition Costs					8,923
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,666
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,868
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,721
Total Carrying Value		14,589			14,589
Accumulated Depreciation		7,585			7,585
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		14,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,585
Western Region | Hilltop
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,174
Initial Costs, Buildings and Improvements					7,408
Total Initial Acquisition Costs					9,582
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,328
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,724
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,186
Total Carrying Value		13,910			13,910
Accumulated Depreciation		6,895			6,895
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,910
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,895
Western Region | The Hawthorne
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					34,934
Initial Costs, Land and Land Improvements					6,474
Initial Costs, Buildings and Improvements					30,226
Total Initial Acquisition Costs					36,700
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,621
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,644
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					34,677
Total Carrying Value		41,321			41,321
Accumulated Depreciation		20,306			20,306
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		41,321
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,306
Western Region | The Kennedy
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,179
Initial Costs, Buildings and Improvements					22,307
Total Initial Acquisition Costs					28,486
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,931
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,272
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					24,145
Total Carrying Value		30,417			30,417
Accumulated Depreciation		13,947			13,947
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		30,417
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,947
Western Region | Hearthstone at Merrill Creek
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					22,591
Initial Costs, Land and Land Improvements					6,848
Initial Costs, Buildings and Improvements					30,922
Total Initial Acquisition Costs					37,770
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,829
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,975
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					34,624
Total Carrying Value		41,599			41,599
Accumulated Depreciation		15,574			15,574
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		41,599
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,574
Western Region | Island Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					21,284
Initial Costs, Buildings and Improvements					89,389
Total Initial Acquisition Costs					110,673
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,695
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,428
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					93,940
Total Carrying Value		115,368			115,368
Accumulated Depreciation		40,021			40,021
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		115,368
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,021
Western Region | Borgata
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,379
Initial Costs, Buildings and Improvements					34,569
Total Initial Acquisition Costs					40,948
Costs of Improvements Capitalized Subsequent to Acquisition Costs					(7,991)
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,404
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					26,553
Total Carrying Value		32,957			32,957
Accumulated Depreciation		12,502			12,502
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		32,957
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,502
Western Region | elements too
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					27,468
Initial Costs, Buildings and Improvements					72,036
Total Initial Acquisition Costs					99,504
Costs of Improvements Capitalized Subsequent to Acquisition Costs					15,676
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					30,244
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					84,936
Total Carrying Value		115,180			115,180
Accumulated Depreciation		39,911			39,911
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		115,180
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		39,911
Western Region | 989elements
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,541
Initial Costs, Buildings and Improvements					45,990
Total Initial Acquisition Costs					54,531
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,968
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,578
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,921
Total Carrying Value		56,499			56,499
Accumulated Depreciation		16,491			16,491
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		56,499
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,491
Western Region | Lightbox [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,449
Initial Costs, Buildings and Improvements					38,884
Total Initial Acquisition Costs					45,333
Costs of Improvements Capitalized Subsequent to Acquisition Costs					422
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,449
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					39,306
Total Carrying Value		45,755			45,755
Accumulated Depreciation		3,374			3,374
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		45,755
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		3,374
Western Region | Waterscape [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,693
Initial Costs, Buildings and Improvements					65,176
Total Initial Acquisition Costs					74,869
Costs of Improvements Capitalized Subsequent to Acquisition Costs					613
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,694
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,788
Total Carrying Value		75,482			75,482
Accumulated Depreciation		4,924			4,924
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		75,482
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,924
Western Region | SEATTLE, WA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					57,525
Initial Costs, Land and Land Improvements					103,975
Initial Costs, Buildings and Improvements					443,344
Total Initial Acquisition Costs					547,319
Costs of Improvements Capitalized Subsequent to Acquisition Costs					35,758
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					108,280
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					474,797
Total Carrying Value		583,077			583,077
Accumulated Depreciation		181,530			181,530
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		583,077
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		181,530
Western Region | Villas at Carlsbad
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,517
Initial Costs, Buildings and Improvements					10,718
Total Initial Acquisition Costs					17,235
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,876
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,780
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					13,331
Total Carrying Value		20,111			20,111
Accumulated Depreciation		7,826			7,826
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,111
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,826
Western Region | Boronda Manor
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,946
Initial Costs, Buildings and Improvements					8,982
Total Initial Acquisition Costs					10,928
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,534
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,195
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					17,267
Total Carrying Value		20,462			20,462
Accumulated Depreciation		9,244			9,244
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,462
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,244
Western Region | Garden Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					888
Initial Costs, Buildings and Improvements					4,188
Total Initial Acquisition Costs					5,076
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,435
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,559
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,952
Total Carrying Value		10,511			10,511
Accumulated Depreciation		4,981			4,981
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,511
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,981
Western Region | Cambridge Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,039
Initial Costs, Buildings and Improvements					12,883
Total Initial Acquisition Costs					15,922
Costs of Improvements Capitalized Subsequent to Acquisition Costs					14,767
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,302
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					25,387
Total Carrying Value		30,689			30,689
Accumulated Depreciation		13,958			13,958
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		30,689
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,958
Western Region | Laurel Tree
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,304
Initial Costs, Buildings and Improvements					5,115
Total Initial Acquisition Costs					6,419
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,080
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,188
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					10,311
Total Carrying Value		12,499			12,499
Accumulated Depreciation		5,627			5,627
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		12,499
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,627
Western Region | The Pointe At Harden Ranch
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,388
Initial Costs, Buildings and Improvements					23,854
Total Initial Acquisition Costs					30,242
Costs of Improvements Capitalized Subsequent to Acquisition Costs					27,357
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,021
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,578
Total Carrying Value		57,599			57,599
Accumulated Depreciation		24,926			24,926
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		57,599
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,926
Western Region | The Pointe At Northridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,044
Initial Costs, Buildings and Improvements					8,028
Total Initial Acquisition Costs					10,072
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,089
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,295
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,866
Total Carrying Value		20,161			20,161
Accumulated Depreciation		9,293			9,293
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,161
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,293
Western Region | The Pointe At Westlake
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,329
Initial Costs, Buildings and Improvements					5,334
Total Initial Acquisition Costs					6,663
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,364
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,181
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					10,846
Total Carrying Value		13,027			13,027
Accumulated Depreciation		5,700			5,700
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,027
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,700
Western Region | MONTEREY PENINSULA, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					16,938
Initial Costs, Buildings and Improvements					68,384
Total Initial Acquisition Costs					85,322
Costs of Improvements Capitalized Subsequent to Acquisition Costs					79,626
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					27,741
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					137,207
Total Carrying Value		164,948			164,948
Accumulated Depreciation		73,729			73,729
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		164,948
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		73,729
Western Region | Verano at Rancho Cucamonga Town Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					55,263
Initial Costs, Land and Land Improvements					13,557
Initial Costs, Buildings and Improvements					3,645
Total Initial Acquisition Costs					17,202
Costs of Improvements Capitalized Subsequent to Acquisition Costs					53,949
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					23,255
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,896
Total Carrying Value		71,151			71,151
Accumulated Depreciation		34,875			34,875
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		71,151
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		34,875
Western Region | Windemere at Sycamore Highland
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,810
Initial Costs, Buildings and Improvements					23,450
Total Initial Acquisition Costs					29,260
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,964
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,129
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					26,095
Total Carrying Value		32,224			32,224
Accumulated Depreciation		17,614			17,614
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		32,224
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		17,614
Western Region | Other Southern CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					55,263
Initial Costs, Land and Land Improvements					25,884
Initial Costs, Buildings and Improvements					37,813
Total Initial Acquisition Costs					63,697
Costs of Improvements Capitalized Subsequent to Acquisition Costs					59,789
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					36,164
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					87,322
Total Carrying Value		123,486			123,486
Accumulated Depreciation		60,315			60,315
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		123,486
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		60,315
Western Region | Tualatin Heights
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,273
Initial Costs, Buildings and Improvements					9,134
Total Initial Acquisition Costs					12,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,745
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,841
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					15,311
Total Carrying Value		19,152			19,152
Accumulated Depreciation		10,231			10,231
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		19,152
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		10,231
Western Region | Hunt Club
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,014
Initial Costs, Buildings and Improvements					14,870
Total Initial Acquisition Costs					20,884
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,866
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,395
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,355
Total Carrying Value		27,750			27,750
Accumulated Depreciation		14,364			14,364
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		27,750
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,364
Western Region | PORTLAND, OR
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,287
Initial Costs, Buildings and Improvements					24,004
Total Initial Acquisition Costs					33,291
Costs of Improvements Capitalized Subsequent to Acquisition Costs					13,611
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,236
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					36,666
Total Carrying Value		46,902			46,902
Accumulated Depreciation		24,595			24,595
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,902
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,595
Western Region | The Residences at Bella Terra
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					25,000
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					25,000
Costs of Improvements Capitalized Subsequent to Acquisition Costs					125,818
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					25,058
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					125,760
Total Carrying Value		150,818			150,818
Accumulated Depreciation		19,253			19,253
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		150,818
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,253
Western Region | Los Alisos [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					17,298
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					17,298
Costs of Improvements Capitalized Subsequent to Acquisition Costs					70,345
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,398
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					71,245
Total Carrying Value		87,643			87,643
Accumulated Depreciation		9,016			9,016
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		87,643
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,016
Mid Atlantic Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					507,412
Initial Costs, Land and Land Improvements					388,304
Initial Costs, Buildings and Improvements					1,550,755
Total Initial Acquisition Costs					1,939,059
Costs of Improvements Capitalized Subsequent to Acquisition Costs					598,125
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					464,660
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,072,524
Total Carrying Value		2,537,184			2,537,184
Accumulated Depreciation		647,723			647,723
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		2,537,184
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		647,723
Mid Atlantic Region | Dominion Middle Ridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					29,344
Initial Costs, Land and Land Improvements					3,311
Initial Costs, Buildings and Improvements					13,283
Total Initial Acquisition Costs					16,594
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,816
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,850
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					19,560
Total Carrying Value		23,410			23,410
Accumulated Depreciation		14,076			14,076
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		23,410
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,076
Mid Atlantic Region | Dominion Lake Ridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					20,047
Initial Costs, Land and Land Improvements					2,366
Initial Costs, Buildings and Improvements					8,387
Total Initial Acquisition Costs					10,753
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,490
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,866
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					15,377
Total Carrying Value		18,243			18,243
Accumulated Depreciation		10,431			10,431
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		18,243
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		10,431
Mid Atlantic Region | Presidential Greens
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					11,238
Initial Costs, Buildings and Improvements					18,790
Total Initial Acquisition Costs					30,028
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,883
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,680
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					28,231
Total Carrying Value		39,911			39,911
Accumulated Depreciation		19,977			19,977
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		39,911
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,977
Mid Atlantic Region | The Whitmore
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,418
Initial Costs, Buildings and Improvements					13,411
Total Initial Acquisition Costs					19,829
Costs of Improvements Capitalized Subsequent to Acquisition Costs					20,734
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,495
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,068
Total Carrying Value		40,563			40,563
Accumulated Depreciation		22,988			22,988
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,563
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,988
Mid Atlantic Region | Ridgewood
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,612
Initial Costs, Buildings and Improvements					20,086
Total Initial Acquisition Costs					25,698
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,522
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,014
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					28,206
Total Carrying Value		34,220			34,220
Accumulated Depreciation		20,340			20,340
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		34,220
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,340
Mid Atlantic Region | Waterside Towers
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,139
Initial Costs, Buildings and Improvements					49,657
Total Initial Acquisition Costs					50,796
Costs of Improvements Capitalized Subsequent to Acquisition Costs					18,261
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					36,233
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					32,824
Total Carrying Value		69,057			69,057
Accumulated Depreciation		20,975			20,975
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		69,057
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,975
Mid Atlantic Region | Wellington Place at Olde Town
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					32,037
Initial Costs, Land and Land Improvements					13,753
Initial Costs, Buildings and Improvements					36,059
Total Initial Acquisition Costs					49,812
Costs of Improvements Capitalized Subsequent to Acquisition Costs					17,416
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,740
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					52,488
Total Carrying Value		67,228			67,228
Accumulated Depreciation		35,000			35,000
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		67,228
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		35,000
Mid Atlantic Region | Andover House
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,357
Initial Costs, Buildings and Improvements					51,577
Total Initial Acquisition Costs					65,934
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,769
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,379
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					55,324
Total Carrying Value		69,703			69,703
Accumulated Depreciation		27,837			27,837
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		69,703
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,837
Mid Atlantic Region | Sullivan Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,137
Initial Costs, Buildings and Improvements					103,676
Total Initial Acquisition Costs					104,813
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,066
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,364
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					110,515
Total Carrying Value		111,879			111,879
Accumulated Depreciation		51,643			51,643
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		111,879
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		51,643
Mid Atlantic Region | Circle Towers
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					70,884
Initial Costs, Land and Land Improvements					32,815
Initial Costs, Buildings and Improvements					107,051
Total Initial Acquisition Costs					139,866
Costs of Improvements Capitalized Subsequent to Acquisition Costs					13,056
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					33,357
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					119,565
Total Carrying Value		152,922			152,922
Accumulated Depreciation		53,022			53,022
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		152,922
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		53,022
Mid Atlantic Region | Delancey at Shirlington
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					21,606
Initial Costs, Buildings and Improvements					66,765
Total Initial Acquisition Costs					88,371
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,195
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,632
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					68,934
Total Carrying Value		90,566			90,566
Accumulated Depreciation		30,609			30,609
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		90,566
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		30,609
Mid Atlantic Region | View 14
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,710
Initial Costs, Buildings and Improvements					97,941
Total Initial Acquisition Costs					103,651
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,888
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,721
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					100,818
Total Carrying Value		106,539			106,539
Accumulated Depreciation		25,845			25,845
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		106,539
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,845
Mid Atlantic Region | Signal Hill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					13,290
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					13,290
Costs of Improvements Capitalized Subsequent to Acquisition Costs					69,769
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					25,510
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					57,549
Total Carrying Value		83,059			83,059
Accumulated Depreciation		25,243			25,243
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		83,059
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,243
Mid Atlantic Region | METROPOLITAN DC
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					407,067
Initial Costs, Land and Land Improvements					345,666
Initial Costs, Buildings and Improvements					1,307,924
Total Initial Acquisition Costs					1,653,590
Costs of Improvements Capitalized Subsequent to Acquisition Costs					454,931
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					406,934
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,701,587
Total Carrying Value		2,108,521			2,108,521
Accumulated Depreciation		403,882			403,882
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		2,108,521
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		403,882
Mid Atlantic Region | Dominion Kings Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					14,294
Initial Costs, Land and Land Improvements					1,565
Initial Costs, Buildings and Improvements					7,007
Total Initial Acquisition Costs					8,572
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,484
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,890
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,166
Total Carrying Value		13,056			13,056
Accumulated Depreciation		8,506			8,506
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,056
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		8,506
Mid Atlantic Region | Dominion At Eden Brook
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,361
Initial Costs, Buildings and Improvements					9,384
Total Initial Acquisition Costs					11,745
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,787
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,977
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					15,555
Total Carrying Value		18,532			18,532
Accumulated Depreciation		12,406			12,406
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		18,532
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,406
Mid Atlantic Region | Ellicott Grove
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,920
Initial Costs, Buildings and Improvements					9,099
Total Initial Acquisition Costs					12,019
Costs of Improvements Capitalized Subsequent to Acquisition Costs					23,363
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,379
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					30,003
Total Carrying Value		35,382			35,382
Accumulated Depreciation		23,332			23,332
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		35,382
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		23,332
Mid Atlantic Region | Dominion Constant Friendship
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					8,783
Initial Costs, Land and Land Improvements					903
Initial Costs, Buildings and Improvements					4,669
Total Initial Acquisition Costs					5,572
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,117
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,320
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,369
Total Carrying Value		9,689			9,689
Accumulated Depreciation		6,274			6,274
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,689
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,274
Mid Atlantic Region | Lakeside Mill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					12,569
Initial Costs, Land and Land Improvements					2,666
Initial Costs, Buildings and Improvements					10,109
Total Initial Acquisition Costs					12,775
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,038
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,997
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					14,816
Total Carrying Value		17,813			17,813
Accumulated Depreciation		11,336			11,336
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		17,813
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,336
Mid Atlantic Region | Calvert’s Walk
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,408
Initial Costs, Buildings and Improvements					24,692
Total Initial Acquisition Costs					29,100
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,396
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,817
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,679
Total Carrying Value		36,496			36,496
Accumulated Depreciation		20,827			20,827
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,496
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,827
Mid Atlantic Region | Arborview Apartments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,653
Initial Costs, Buildings and Improvements					23,952
Total Initial Acquisition Costs					28,605
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,090
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,249
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,446
Total Carrying Value		36,695			36,695
Accumulated Depreciation		21,388			21,388
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,695
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,388
Mid Atlantic Region | Liriope Apartments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,620
Initial Costs, Buildings and Improvements					6,791
Total Initial Acquisition Costs					8,411
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,374
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,653
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,132
Total Carrying Value		9,785			9,785
Accumulated Depreciation		5,352			5,352
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,785
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,352
Mid Atlantic Region | 20 Lambourne
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					30,132
Initial Costs, Land and Land Improvements					11,750
Initial Costs, Buildings and Improvements					45,590
Total Initial Acquisition Costs					57,340
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,406
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					12,106
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					51,640
Total Carrying Value		63,746			63,746
Accumulated Depreciation		24,313			24,313
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,746
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,313
Mid Atlantic Region | Domain Brewers Hill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,669
Initial Costs, Buildings and Improvements					40,630
Total Initial Acquisition Costs					45,299
Costs of Improvements Capitalized Subsequent to Acquisition Costs					942
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,700
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					41,541
Total Carrying Value		46,241			46,241
Accumulated Depreciation		12,690			12,690
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,241
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,690
Mid Atlantic Region | BALTIMORE, MD
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					65,778
Initial Costs, Land and Land Improvements					37,515
Initial Costs, Buildings and Improvements					181,923
Total Initial Acquisition Costs					219,438
Costs of Improvements Capitalized Subsequent to Acquisition Costs					67,997
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					43,088
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					244,347
Total Carrying Value		287,435			287,435
Accumulated Depreciation		146,424			146,424
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		287,435
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		146,424
Mid Atlantic Region | Gayton Pointe Townhomes
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					826
Initial Costs, Buildings and Improvements					5,148
Total Initial Acquisition Costs					5,974
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,738
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,463
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					32,249
Total Carrying Value		35,712			35,712
Accumulated Depreciation		27,255			27,255
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		35,712
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,255
Mid Atlantic Region | Waterside At Ironbridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,844
Initial Costs, Buildings and Improvements					13,239
Total Initial Acquisition Costs					15,083
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,614
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,328
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					20,369
Total Carrying Value		22,697			22,697
Accumulated Depreciation		13,860			13,860
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		22,697
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,860
Mid Atlantic Region | Carriage Homes at Wyndham
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					474
Initial Costs, Buildings and Improvements					30,997
Total Initial Acquisition Costs					31,471
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,959
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,901
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					35,529
Total Carrying Value		39,430			39,430
Accumulated Depreciation		24,260			24,260
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		39,430
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,260
Mid Atlantic Region | Legacy at Mayland
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					34,567
Initial Costs, Land and Land Improvements					1,979
Initial Costs, Buildings and Improvements					11,524
Total Initial Acquisition Costs					13,503
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,886
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,946
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					38,443
Total Carrying Value		43,389			43,389
Accumulated Depreciation		32,042			32,042
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		43,389
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		32,042
Mid Atlantic Region | RICHMOND, VA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					34,567
Initial Costs, Land and Land Improvements					5,123
Initial Costs, Buildings and Improvements					60,908
Total Initial Acquisition Costs					66,031
Costs of Improvements Capitalized Subsequent to Acquisition Costs					75,197
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,638
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					126,590
Total Carrying Value		141,228			141,228
Accumulated Depreciation		97,417			97,417
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		141,228
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		97,417
Mid Atlantic Region | DelRey Tower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					297
Initial Costs, Buildings and Improvements					12,786
Total Initial Acquisition Costs					13,083
Costs of Improvements Capitalized Subsequent to Acquisition Costs					113,357
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,461
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					116,979
Total Carrying Value		126,440			126,440
Accumulated Depreciation		9,914			9,914
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		126,440
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,914
Mid Atlantic Region | Capitol View on 14th
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					31,393
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					31,393
Costs of Improvements Capitalized Subsequent to Acquisition Costs					94,714
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					31,395
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					94,712
Total Carrying Value		126,107			126,107
Accumulated Depreciation		17,603			17,603
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		126,107
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		17,603
Mid Atlantic Region | Domain College Park [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					31,337
Initial Costs, Land and Land Improvements					7,300
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					7,300
Costs of Improvements Capitalized Subsequent to Acquisition Costs					58,032
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,307
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					58,025
Total Carrying Value		65,332			65,332
Accumulated Depreciation		8,008			8,008
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		65,332
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		8,008
Mid Atlantic Region | 1200 East West [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,748
Initial Costs, Buildings and Improvements					68,022
Total Initial Acquisition Costs					77,770
Costs of Improvements Capitalized Subsequent to Acquisition Costs					85
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,749
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					68,106
Total Carrying Value		77,855			77,855
Accumulated Depreciation		878			878
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		77,855
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		878
Mid Atlantic Region | Courts at Huntington Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					27,749
Initial Costs, Buildings and Improvements					111,878
Total Initial Acquisition Costs					139,627
Costs of Improvements Capitalized Subsequent to Acquisition Costs					78
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					27,749
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					111,956
Total Carrying Value		139,705			139,705
Accumulated Depreciation		1,682			1,682
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		139,705
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,682
Mid Atlantic Region | Eleven55 Ripley [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					15,566
Initial Costs, Buildings and Improvements					107,539
Total Initial Acquisition Costs					123,105
Costs of Improvements Capitalized Subsequent to Acquisition Costs					76
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					15,566
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					107,615
Total Carrying Value		123,181			123,181
Accumulated Depreciation		1,402			1,402
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		123,181
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,402
Mid Atlantic Region | Arbor Park of Alexandria [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					95,818
Initial Costs, Land and Land Improvements					50,881
Initial Costs, Buildings and Improvements					159,728
Total Initial Acquisition Costs					210,609
Costs of Improvements Capitalized Subsequent to Acquisition Costs					99
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					50,881
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					159,827
Total Carrying Value		210,708			210,708
Accumulated Depreciation		2,428			2,428
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		210,708
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,428
Mid Atlantic Region | Courts at Dulles [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,697
Initial Costs, Buildings and Improvements					83,834
Total Initial Acquisition Costs					98,531
Costs of Improvements Capitalized Subsequent to Acquisition Costs					150
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,700
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					83,981
Total Carrying Value		98,681			98,681
Accumulated Depreciation		1,277			1,277
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		98,681
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,277
Mid Atlantic Region | Newport Village [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					127,600
Initial Costs, Land and Land Improvements					55,283
Initial Costs, Buildings and Improvements					177,454
Total Initial Acquisition Costs					232,737
Costs of Improvements Capitalized Subsequent to Acquisition Costs					475
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					55,285
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					177,927
Total Carrying Value		233,212			233,212
Accumulated Depreciation		2,704			2,704
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		233,212
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,704
Southeastern Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					170,986
Initial Costs, Land and Land Improvements					86,349
Initial Costs, Buildings and Improvements					355,426
Total Initial Acquisition Costs					441,775
Costs of Improvements Capitalized Subsequent to Acquisition Costs					288,284
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					118,304
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					611,755
Total Carrying Value		730,059			730,059
Accumulated Depreciation		425,591			425,591
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		730,059
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		425,591
Southeastern Region | Summit West
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,176
Initial Costs, Buildings and Improvements					4,710
Total Initial Acquisition Costs					6,886
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,314
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,552
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					12,648
Total Carrying Value		16,200			16,200
Accumulated Depreciation		11,005			11,005
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		16,200
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,005
Southeastern Region | The Breyley
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,780
Initial Costs, Buildings and Improvements					2,458
Total Initial Acquisition Costs					4,238
Costs of Improvements Capitalized Subsequent to Acquisition Costs					17,606
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,457
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					18,387
Total Carrying Value		21,844			21,844
Accumulated Depreciation		16,978			16,978
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		21,844
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,978
Southeastern Region | Lakewood Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					18,230
Initial Costs, Land and Land Improvements					1,395
Initial Costs, Buildings and Improvements					10,647
Total Initial Acquisition Costs					12,042
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,654
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,709
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					18,987
Total Carrying Value		21,696			21,696
Accumulated Depreciation		14,531			14,531
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		21,696
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,531
Southeastern Region | Cambridge Woods
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					12,713
Initial Costs, Land and Land Improvements					1,791
Initial Costs, Buildings and Improvements					7,166
Total Initial Acquisition Costs					8,957
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,042
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,687
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					15,312
Total Carrying Value		17,999			17,999
Accumulated Depreciation		11,297			11,297
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		17,999
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,297
Southeastern Region | Inlet Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					7,702
Initial Costs, Buildings and Improvements					23,150
Total Initial Acquisition Costs					30,852
Costs of Improvements Capitalized Subsequent to Acquisition Costs					15,659
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,304
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					37,207
Total Carrying Value		46,511			46,511
Accumulated Depreciation		27,055			27,055
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,511
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,055
Southeastern Region | MacAlpine Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,869
Initial Costs, Buildings and Improvements					36,858
Total Initial Acquisition Costs					47,727
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,862
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,545
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					44,044
Total Carrying Value		55,589			55,589
Accumulated Depreciation		28,780			28,780
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		55,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		28,780
Southeastern Region | The Vintage Lofts at West End
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,611
Initial Costs, Buildings and Improvements					37,663
Total Initial Acquisition Costs					44,274
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,107
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					15,119
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					45,262
Total Carrying Value		60,381			60,381
Accumulated Depreciation		22,082			22,082
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		60,381
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,082
Southeastern Region | TAMPA, FL
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					30,943
Initial Costs, Land and Land Improvements					32,324
Initial Costs, Buildings and Improvements					122,652
Total Initial Acquisition Costs					154,976
Costs of Improvements Capitalized Subsequent to Acquisition Costs					85,244
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					48,373
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					191,847
Total Carrying Value		240,220			240,220
Accumulated Depreciation		131,728			131,728
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		240,220
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		131,728
Southeastern Region | Seabrook
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,846
Initial Costs, Buildings and Improvements					4,155
Total Initial Acquisition Costs					6,001
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,427
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,763
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,665
Total Carrying Value		14,428			14,428
Accumulated Depreciation		9,531			9,531
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		14,428
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,531
Southeastern Region | Altamira Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,533
Initial Costs, Buildings and Improvements					11,076
Total Initial Acquisition Costs					12,609
Costs of Improvements Capitalized Subsequent to Acquisition Costs					20,724
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,539
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					29,794
Total Carrying Value		33,333			33,333
Accumulated Depreciation		25,586			25,586
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		33,333
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,586
Southeastern Region | Regatta Shore
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					757
Initial Costs, Buildings and Improvements					6,608
Total Initial Acquisition Costs					7,365
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,031
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,060
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,336
Total Carrying Value		23,396			23,396
Accumulated Depreciation		17,330			17,330
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		23,396
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		17,330
Southeastern Region | Alafaya Woods
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					17,776
Initial Costs, Land and Land Improvements					1,653
Initial Costs, Buildings and Improvements					9,042
Total Initial Acquisition Costs					10,695
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,245
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,555
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					17,385
Total Carrying Value		19,940			19,940
Accumulated Depreciation		13,299			13,299
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		19,940
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,299
Southeastern Region | Los Altos
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					21,592
Initial Costs, Land and Land Improvements					2,804
Initial Costs, Buildings and Improvements					12,349
Total Initial Acquisition Costs					15,153
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,994
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,058
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					22,089
Total Carrying Value		26,147			26,147
Accumulated Depreciation		15,263			15,263
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		26,147
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,263
Southeastern Region | Lotus Landing
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,185
Initial Costs, Buildings and Improvements					8,639
Total Initial Acquisition Costs					10,824
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,108
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,873
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					18,059
Total Carrying Value		20,932			20,932
Accumulated Depreciation		11,987			11,987
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,932
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,987
Southeastern Region | Seville On The Green
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,282
Initial Costs, Buildings and Improvements					6,498
Total Initial Acquisition Costs					7,780
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,249
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,738
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					13,291
Total Carrying Value		15,029			15,029
Accumulated Depreciation		9,051			9,051
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		15,029
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,051
Southeastern Region | Ashton @ Waterford
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					23,015
Initial Costs, Land and Land Improvements					3,872
Initial Costs, Buildings and Improvements					17,538
Total Initial Acquisition Costs					21,410
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,563
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,273
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,700
Total Carrying Value		25,973			25,973
Accumulated Depreciation		13,830			13,830
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		25,973
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,830
Southeastern Region | Arbors at Lee Vista DCO
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,692
Initial Costs, Buildings and Improvements					12,860
Total Initial Acquisition Costs					19,552
Costs of Improvements Capitalized Subsequent to Acquisition Costs					12,894
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,264
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					25,182
Total Carrying Value		32,446			32,446
Accumulated Depreciation		19,618			19,618
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		32,446
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,618
Southeastern Region | ORLANDO, FL
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					62,383
Initial Costs, Land and Land Improvements					22,624
Initial Costs, Buildings and Improvements					88,765
Total Initial Acquisition Costs					111,389
Costs of Improvements Capitalized Subsequent to Acquisition Costs					100,235
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					31,123
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					180,501
Total Carrying Value		211,624			211,624
Accumulated Depreciation		135,495			135,495
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		211,624
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		135,495
Southeastern Region | Legacy Hill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,148
Initial Costs, Buildings and Improvements					5,867
Total Initial Acquisition Costs					7,015
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,807
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,764
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					14,058
Total Carrying Value		15,822			15,822
Accumulated Depreciation		11,246			11,246
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		15,822
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,246
Southeastern Region | Hickory Run
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,469
Initial Costs, Buildings and Improvements					11,584
Total Initial Acquisition Costs					13,053
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,459
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,155
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,357
Total Carrying Value		23,512			23,512
Accumulated Depreciation		14,244			14,244
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		23,512
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,244
Southeastern Region | Carrington Hills
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,117
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					2,117
Costs of Improvements Capitalized Subsequent to Acquisition Costs					34,535
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,506
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					32,146
Total Carrying Value		36,652			36,652
Accumulated Depreciation		21,305			21,305
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,652
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,305
Southeastern Region | Brookridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					708
Initial Costs, Buildings and Improvements					5,461
Total Initial Acquisition Costs					6,169
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,830
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,162
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					9,837
Total Carrying Value		10,999			10,999
Accumulated Depreciation		7,007			7,007
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,999
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,007
Southeastern Region | Breckenridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					766
Initial Costs, Buildings and Improvements					7,714
Total Initial Acquisition Costs					8,480
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,646
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,285
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,841
Total Carrying Value		13,126			13,126
Accumulated Depreciation		8,155			8,155
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,126
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		8,155
Southeastern Region | Colonnade
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					16,677
Initial Costs, Land and Land Improvements					1,460
Initial Costs, Buildings and Improvements					16,015
Total Initial Acquisition Costs					17,475
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,766
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,952
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,289
Total Carrying Value		23,241			23,241
Accumulated Depreciation		12,268			12,268
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		23,241
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,268
Southeastern Region | The Preserve at Brentwood
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					21,804
Initial Costs, Land and Land Improvements					3,182
Initial Costs, Buildings and Improvements					24,674
Total Initial Acquisition Costs					27,856
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,431
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,641
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,646
Total Carrying Value		35,287			35,287
Accumulated Depreciation		21,056			21,056
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		35,287
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,056
Southeastern Region | Polo Park
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,583
Initial Costs, Buildings and Improvements					16,293
Total Initial Acquisition Costs					20,876
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,508
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,741
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,643
Total Carrying Value		37,384			37,384
Accumulated Depreciation		22,411			22,411
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		37,384
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,411
Southeastern Region | NASHVILLE, TN
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					38,481
Initial Costs, Land and Land Improvements					15,433
Initial Costs, Buildings and Improvements					87,608
Total Initial Acquisition Costs					103,041
Costs of Improvements Capitalized Subsequent to Acquisition Costs					92,982
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					22,206
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					173,817
Total Carrying Value		196,023			196,023
Accumulated Depreciation		117,692			117,692
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		196,023
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		117,692
Southeastern Region | The Reserve and Park at Riverbridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					15,968
Initial Costs, Buildings and Improvements					56,401
Total Initial Acquisition Costs					72,369
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,823
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,602
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,590
Total Carrying Value		82,192			82,192
Accumulated Depreciation		40,676			40,676
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		82,192
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,676
Southeastern Region | OTHER FLORIDA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					15,968
Initial Costs, Buildings and Improvements					56,401
Total Initial Acquisition Costs					72,369
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,823
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,602
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,590
Total Carrying Value		82,192			82,192
Accumulated Depreciation		40,676			40,676
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		82,192
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,676
Northeast Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					77,066
Initial Costs, Land and Land Improvements					317,831
Initial Costs, Buildings and Improvements					1,182,479
Total Initial Acquisition Costs					1,500,310
Costs of Improvements Capitalized Subsequent to Acquisition Costs					337,084
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					317,479
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,519,915
Total Carrying Value		1,837,394			1,837,394
Accumulated Depreciation		344,653			344,653
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,837,394
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		344,653
Northeast Region | Garrison Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,591
Initial Costs, Buildings and Improvements					91,027
Total Initial Acquisition Costs					96,618
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,226
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,635
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					98,209
Total Carrying Value		103,844			103,844
Accumulated Depreciation		29,629			29,629
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		103,844
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		29,629
Northeast Region | Ridge at Blue Hills
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					22,147
Initial Costs, Land and Land Improvements					6,039
Initial Costs, Buildings and Improvements					34,869
Total Initial Acquisition Costs					40,908
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,479
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,113
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					36,274
Total Carrying Value		42,387			42,387
Accumulated Depreciation		11,196			11,196
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		42,387
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,196
Northeast Region | Inwood West
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					54,919
Initial Costs, Land and Land Improvements					20,778
Initial Costs, Buildings and Improvements					88,096
Total Initial Acquisition Costs					108,874
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,121
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					19,324
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					94,671
Total Carrying Value		113,995			113,995
Accumulated Depreciation		26,028			26,028
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		113,995
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		26,028
Northeast Region | 14 North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,961
Initial Costs, Buildings and Improvements					51,175
Total Initial Acquisition Costs					62,136
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,359
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,077
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					57,418
Total Carrying Value		68,495			68,495
Accumulated Depreciation		16,632			16,632
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		68,495
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,632
Northeast Region | BOSTON, MA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					77,066
Initial Costs, Land and Land Improvements					67,953
Initial Costs, Buildings and Improvements					265,167
Total Initial Acquisition Costs					333,120
Costs of Improvements Capitalized Subsequent to Acquisition Costs					210,880
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					66,733
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					477,267
Total Carrying Value		544,000			544,000
Accumulated Depreciation		90,744			90,744
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		544,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		90,744
Northeast Region | 10 Hanover Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					41,432
Initial Costs, Buildings and Improvements					218,983
Total Initial Acquisition Costs					260,415
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,730
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					41,496
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					228,649
Total Carrying Value		270,145			270,145
Accumulated Depreciation		54,457			54,457
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		270,145
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		54,457
Northeast Region | 21 Chelsea
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					36,399
Initial Costs, Buildings and Improvements					107,154
Total Initial Acquisition Costs					143,553
Costs of Improvements Capitalized Subsequent to Acquisition Costs					12,592
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					36,414
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					119,731
Total Carrying Value		156,145			156,145
Accumulated Depreciation		28,031			28,031
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		156,145
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		28,031
Northeast Region | View 34 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					114,410
Initial Costs, Buildings and Improvements					324,920
Total Initial Acquisition Costs					439,330
Costs of Improvements Capitalized Subsequent to Acquisition Costs					96,772
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					115,026
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					421,076
Total Carrying Value		536,102			536,102
Accumulated Depreciation		99,652			99,652
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		536,102
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		99,652
Northeast Region | 95 Wall Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					57,637
Initial Costs, Buildings and Improvements					266,255
Total Initial Acquisition Costs					323,892
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,110
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					57,810
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					273,192
Total Carrying Value		331,002			331,002
Accumulated Depreciation		71,769			71,769
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		331,002
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		71,769
Northeast Region | NEW YORK, NY
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					249,878
Initial Costs, Buildings and Improvements					917,312
Total Initial Acquisition Costs					1,167,190
Costs of Improvements Capitalized Subsequent to Acquisition Costs					126,204
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					250,746
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,042,648
Total Carrying Value		1,293,394			1,293,394
Accumulated Depreciation		253,909			253,909
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,293,394
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		253,909
Northeast Region | Pier 4
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					24,584
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					24,584
Costs of Improvements Capitalized Subsequent to Acquisition Costs					190,695
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					24,584
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					190,695
Total Carrying Value		215,279			215,279
Accumulated Depreciation		7,259			7,259
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		215,279
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,259
Southwestern Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					148,394
Initial Costs, Land and Land Improvements					99,870
Initial Costs, Buildings and Improvements					257,677
Total Initial Acquisition Costs					357,547
Costs of Improvements Capitalized Subsequent to Acquisition Costs					89,898
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					115,906
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					331,539
Total Carrying Value		447,445			447,445
Accumulated Depreciation		170,852			170,852
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		447,445
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		170,852
Southwestern Region | THIRTY377
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					29,361
Initial Costs, Land and Land Improvements					24,036
Initial Costs, Buildings and Improvements					32,951
Total Initial Acquisition Costs					56,987
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,332
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					24,382
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					41,937
Total Carrying Value		66,319			66,319
Accumulated Depreciation		24,256			24,256
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		66,319
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,256
Southwestern Region | Legacy Village
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					82,734
Initial Costs, Land and Land Improvements					16,882
Initial Costs, Buildings and Improvements					100,102
Total Initial Acquisition Costs					116,984
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,827
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					17,407
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					108,404
Total Carrying Value		125,811			125,811
Accumulated Depreciation		50,919			50,919
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		125,811
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		50,919
Southwestern Region | Garden Oaks
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,132
Initial Costs, Buildings and Improvements					5,367
Total Initial Acquisition Costs					7,499
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,812
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,947
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,364
Total Carrying Value		9,311			9,311
Accumulated Depreciation		1,996			1,996
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,311
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,996
Southwestern Region | Glenwood
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					7,903
Initial Costs, Buildings and Improvements					554
Total Initial Acquisition Costs					8,457
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,105
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,159
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,403
Total Carrying Value		10,562			10,562
Accumulated Depreciation		1,583			1,583
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,562
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,583
Southwestern Region | Talisker of Addison
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,440
Initial Costs, Buildings and Improvements					634
Total Initial Acquisition Costs					11,074
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,259
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,845
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,488
Total Carrying Value		13,333			13,333
Accumulated Depreciation		2,026			2,026
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,333
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,026
Southwestern Region | Springhaven
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,688
Initial Costs, Buildings and Improvements					3,354
Total Initial Acquisition Costs					10,042
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,543
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,359
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					3,226
Total Carrying Value		11,585			11,585
Accumulated Depreciation		2,465			2,465
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		11,585
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,465
Southwestern Region | Clipper Pointe
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					13,221
Initial Costs, Buildings and Improvements					2,507
Total Initial Acquisition Costs					15,728
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,615
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					15,001
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					3,342
Total Carrying Value		18,343			18,343
Accumulated Depreciation		2,897			2,897
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		18,343
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,897
Southwestern Region | Highlands of Preston
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,151
Initial Costs, Buildings and Improvements					8,168
Total Initial Acquisition Costs					10,319
Costs of Improvements Capitalized Subsequent to Acquisition Costs					31,543
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,044
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					35,818
Total Carrying Value		41,862			41,862
Accumulated Depreciation		26,252			26,252
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		41,862
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		26,252
Southwestern Region | DALLAS, TX
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					112,095
Initial Costs, Land and Land Improvements					83,453
Initial Costs, Buildings and Improvements					153,637
Total Initial Acquisition Costs					237,090
Costs of Improvements Capitalized Subsequent to Acquisition Costs					60,036
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					97,144
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					199,982
Total Carrying Value		297,126			297,126
Accumulated Depreciation		112,394			112,394
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		297,126
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		112,394
Southwestern Region | Barton Creek Landing
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,151
Initial Costs, Buildings and Improvements					14,269
Total Initial Acquisition Costs					17,420
Costs of Improvements Capitalized Subsequent to Acquisition Costs					22,588
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,913
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					35,095
Total Carrying Value		40,008			40,008
Accumulated Depreciation		22,924			22,924
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,008
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,924
Southwestern Region | Residences at the Domain
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,299
Initial Costs, Land and Land Improvements					4,034
Initial Costs, Buildings and Improvements					55,256
Total Initial Acquisition Costs					59,290
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,668
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,281
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					58,677
Total Carrying Value		62,958			62,958
Accumulated Depreciation		25,547			25,547
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		62,958
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,547
Southwestern Region | Red Stone Ranch
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,084
Initial Costs, Buildings and Improvements					17,646
Total Initial Acquisition Costs					22,730
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,111
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,272
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					19,569
Total Carrying Value		24,841			24,841
Accumulated Depreciation		5,243			5,243
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		24,841
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,243
Southwestern Region | Lakeline Villas
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,148
Initial Costs, Buildings and Improvements					16,869
Total Initial Acquisition Costs					21,017
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,495
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,296
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					18,216
Total Carrying Value		22,512			22,512
Accumulated Depreciation		4,744			4,744
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		22,512
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,744
Southwestern Region | AUSTIN, TX
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,299
Initial Costs, Land and Land Improvements					16,417
Initial Costs, Buildings and Improvements					104,040
Total Initial Acquisition Costs					120,457
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,862
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					18,762
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					131,557
Total Carrying Value		150,319			150,319
Accumulated Depreciation		58,458			58,458
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		150,319
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		58,458
Corporate Joint Venture [Member]
Real Estate Owned, Gross [Roll Forward]
Real estate acquired		0	0	129,437
Retirement of fully depreciated assets		0	(112,344)	(356,303)
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Accumulated depreciation on retirements of fully depreciated assets		$ 0	$ (4,228)	$ (20,662)
Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Deferred Finance Costs, Net					$ (5,549)
[1]	Includes unallocated accruals and capital expenditures.The aggregate cost for federal income tax purposes was approximately $8.3 billion at December 31, 2015. The estimated depreciable lives for all buildings in the latest Consolidated Statements of Operations are 35 to 55 years.

Schedule III - Real Estate O148

Schedule III - Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate and Accumulated Depreciation [Line Items]
Deferred Finance Costs, Net						$ 0
Total Carrying Value		$ 8,383,259	$ 8,207,977	$ 8,055,828	$ 9,190,276	8,383,259	$ 8,207,977
Accumulated Depreciation		2,434,772	2,208,794	1,924,682	2,646,874	2,434,772	2,208,794
Aggregate cost for federal income tax purposes					8,300,000
Real Estate Owned, Gross [Roll Forward]
Balance at beginning of the year		8,383,259	8,207,977	8,055,828
Real estate acquired		906,446	231,225	0
Capital expenditures and development		203,183	326,461	452,057
Real estate sold		(301,920)	(269,681)	(70,687)
Real Estate Investment Property, at Cost					9,053,599	8,205,627
Hurricane related impairment of assets		(692)	(379)	(2,355)
Balance at end of the year		9,190,276	8,383,259	8,207,977
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at beginning of the year		2,434,772	2,208,794	1,924,682
Depreciation expense for the year		364,622	356,673	339,326
Accumulated depreciation on sales		(152,520)	(126,151)	(34,794)
Accumulated depreciation on retirements of fully depreciated asset		0	0	(1,132)
Write off of accumulated depreciation on hurricane related impaired assets		0	(316)	0
Balance at end of year		$ 2,646,874	2,434,772	2,208,794
Estimated depreciable lives of buildings range beginning
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life for all buildings		35 years
Estimated depreciable lives of buildings range end
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life for all buildings		55 years
Other
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	[1]				0
Initial Costs, Land and Land Improvements	[1]				0
Initial Costs, Buildings and Improvements	[1]				0
Total Initial Acquisition Costs	[1]				0
Costs of Improvements Capitalized Subsequent to Acquisition Costs	[1]				5,356
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	[1]				0
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	[1]				5,356
Total Carrying Value	[1]	$ 5,356			5,356
Accumulated Depreciation	[1]	62			62
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year	[1]	5,356
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year	[1]	62
TOTAL CORPORATE
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					11,755
Initial Costs, Land and Land Improvements					3,034
Initial Costs, Buildings and Improvements					20,534
Total Initial Acquisition Costs					23,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,093
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,034
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					26,627
Total Carrying Value		29,661			29,661
Accumulated Depreciation		691			691
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		29,661
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		691
Real Estate Under Development
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					78,085
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					78,085
Costs of Improvements Capitalized Subsequent to Acquisition Costs					45,987
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					78,085
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					45,987
Total Carrying Value		124,072			124,072
Accumulated Depreciation		0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		124,072
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		0
Land
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					56,782
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					56,782
Costs of Improvements Capitalized Subsequent to Acquisition Costs					23,838
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					63,923
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,697
Total Carrying Value		80,620			80,620
Accumulated Depreciation		2,935			2,935
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		80,620
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,935
Commercial Held for Development
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					32,351
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					32,351
Costs of Improvements Capitalized Subsequent to Acquisition Costs					30,909
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					40,197
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					23,063
Total Carrying Value		63,260			63,260
Accumulated Depreciation		16,504			16,504
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,260
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,504
Commercial Held for Development | TOTAL COMMERCIAL & CORPORATE
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					11,755
Initial Costs, Land and Land Improvements					35,385
Initial Costs, Buildings and Improvements					20,534
Total Initial Acquisition Costs					55,919
Costs of Improvements Capitalized Subsequent to Acquisition Costs					37,002
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					43,231
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					49,690
Total Carrying Value		92,921			92,921
Accumulated Depreciation		17,195			17,195
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		92,921
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		17,195
Commercial Held for Development | Total Real Estate Owned
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					1,376,945
Initial Costs, Land and Land Improvements					1,877,466
Initial Costs, Buildings and Improvements					4,870,890
Total Initial Acquisition Costs					6,748,356
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,441,920
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,095,022
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					7,095,254
Total Carrying Value		9,190,276			9,190,276
Accumulated Depreciation		2,646,874			2,646,874
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,190,276
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,646,874
Western Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					466,881
Initial Costs, Land and Land Improvements					804,897
Initial Costs, Buildings and Improvements					1,504,019
Total Initial Acquisition Costs					2,308,916
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,019,059
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					883,471
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,444,504
Total Carrying Value		3,327,975			3,327,975
Accumulated Depreciation		1,037,095			1,037,095
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		3,327,975
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,037,095
Western Region | Harbor at Mesa Verde
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					61,050
Initial Costs, Land and Land Improvements					20,476
Initial Costs, Buildings and Improvements					28,538
Total Initial Acquisition Costs					49,014
Costs of Improvements Capitalized Subsequent to Acquisition Costs					14,641
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,314
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					42,341
Total Carrying Value		63,655			63,655
Accumulated Depreciation		27,697			27,697
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,655
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,697
Western Region | 27 Seventy FIve Mesa Verde [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,423
Initial Costs, Land and Land Improvements					99,329
Initial Costs, Buildings and Improvements					110,644
Total Initial Acquisition Costs					209,973
Costs of Improvements Capitalized Subsequent to Acquisition Costs					92,673
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					112,650
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					189,996
Total Carrying Value		302,646			302,646
Accumulated Depreciation		87,007			87,007
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		302,646
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		87,007
Western Region | Pacific Shores
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					42,552
Initial Costs, Land and Land Improvements					7,345
Initial Costs, Buildings and Improvements					22,624
Total Initial Acquisition Costs					29,969
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,913
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,913
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,969
Total Carrying Value		39,882			39,882
Accumulated Depreciation		20,771			20,771
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		39,882
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,771
Western Region | Huntington Vista
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,980
Initial Costs, Land and Land Improvements					8,055
Initial Costs, Buildings and Improvements					22,486
Total Initial Acquisition Costs					30,541
Costs of Improvements Capitalized Subsequent to Acquisition Costs					11,612
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,713
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,440
Total Carrying Value		42,153			42,153
Accumulated Depreciation		19,810			19,810
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		42,153
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,810
Western Region | Missions at Back Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					229
Initial Costs, Buildings and Improvements					14,129
Total Initial Acquisition Costs					14,358
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,526
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,874
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,010
Total Carrying Value		16,884			16,884
Accumulated Depreciation		4,229			4,229
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		16,884
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,229
Western Region | Coronado at Newport — North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					62,516
Initial Costs, Buildings and Improvements					46,082
Total Initial Acquisition Costs					108,598
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,014
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					66,770
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					70,842
Total Carrying Value		137,612			137,612
Accumulated Depreciation		44,814			44,814
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		137,612
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		44,814
Western Region | Vista Del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,670
Initial Costs, Buildings and Improvements					7,080
Total Initial Acquisition Costs					17,750
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,502
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,988
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					9,264
Total Carrying Value		20,252			20,252
Accumulated Depreciation		6,117			6,117
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,252
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,117
Western Region | Coronado South
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					58,785
Initial Costs, Buildings and Improvements					50,067
Total Initial Acquisition Costs					108,852
Costs of Improvements Capitalized Subsequent to Acquisition Costs					19,393
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					59,278
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					68,967
Total Carrying Value		128,245			128,245
Accumulated Depreciation		43,476			43,476
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		128,245
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		43,476
Western Region | ORANGE COUNTY, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					177,005
Initial Costs, Land and Land Improvements					351,315
Initial Costs, Buildings and Improvements					359,742
Total Initial Acquisition Costs					711,057
Costs of Improvements Capitalized Subsequent to Acquisition Costs					421,532
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					382,189
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					750,400
Total Carrying Value		1,132,589			1,132,589
Accumulated Depreciation		307,438			307,438
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,132,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		307,438
Western Region | 2000 Post Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,861
Initial Costs, Buildings and Improvements					44,578
Total Initial Acquisition Costs					54,439
Costs of Improvements Capitalized Subsequent to Acquisition Costs					30,040
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					13,541
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					70,938
Total Carrying Value		84,479			84,479
Accumulated Depreciation		31,789			31,789
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		84,479
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		31,789
Western Region | Birch Creek
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,365
Initial Costs, Buildings and Improvements					16,696
Total Initial Acquisition Costs					21,061
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,536
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,139
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					23,458
Total Carrying Value		28,597			28,597
Accumulated Depreciation		13,756			13,756
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		28,597
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,756
Western Region | Highlands Of Marin
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,996
Initial Costs, Buildings and Improvements					24,868
Total Initial Acquisition Costs					30,864
Costs of Improvements Capitalized Subsequent to Acquisition Costs					26,063
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,257
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					49,670
Total Carrying Value		56,927			56,927
Accumulated Depreciation		29,237			29,237
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		56,927
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		29,237
Western Region | Marina Playa
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,224
Initial Costs, Buildings and Improvements					23,916
Total Initial Acquisition Costs					30,140
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,032
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,938
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,234
Total Carrying Value		40,172			40,172
Accumulated Depreciation		19,547			19,547
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,172
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,547
Western Region | The Westerly
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					67,700
Initial Costs, Land and Land Improvements					48,182
Initial Costs, Buildings and Improvements					102,364
Total Initial Acquisition Costs					150,546
Costs of Improvements Capitalized Subsequent to Acquisition Costs					37,220
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					50,722
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					137,044
Total Carrying Value		187,766			187,766
Accumulated Depreciation		46,474			46,474
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		187,766
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		46,474
Western Region | River Terrace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,310
Initial Costs, Land and Land Improvements					22,161
Initial Costs, Buildings and Improvements					40,137
Total Initial Acquisition Costs					62,298
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,307
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					22,428
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					44,177
Total Carrying Value		66,605			66,605
Accumulated Depreciation		25,943			25,943
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		66,605
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,943
Western Region | CitySouth
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,031
Initial Costs, Buildings and Improvements					30,537
Total Initial Acquisition Costs					44,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs					35,627
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,290
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					63,905
Total Carrying Value		80,195			80,195
Accumulated Depreciation		36,437			36,437
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		80,195
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		36,437
Western Region | Bay Terrace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,545
Initial Costs, Buildings and Improvements					14,458
Total Initial Acquisition Costs					23,003
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,046
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,458
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,591
Total Carrying Value		28,049			28,049
Accumulated Depreciation		9,622			9,622
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		28,049
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,622
Western Region | Highlands of Marin Phase II
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,353
Initial Costs, Buildings and Improvements					18,559
Total Initial Acquisition Costs					23,912
Costs of Improvements Capitalized Subsequent to Acquisition Costs					11,088
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,758
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					29,242
Total Carrying Value		35,000			35,000
Accumulated Depreciation		15,221			15,221
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		35,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,221
Western Region | Edgewater
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					30,657
Initial Costs, Buildings and Improvements					83,872
Total Initial Acquisition Costs					114,529
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,689
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					30,690
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					87,528
Total Carrying Value		118,218			118,218
Accumulated Depreciation		39,217			39,217
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		118,218
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		39,217
Western Region | Almaden Lake Village
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					27,000
Initial Costs, Land and Land Improvements					594
Initial Costs, Buildings and Improvements					42,515
Total Initial Acquisition Costs					43,109
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,031
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					773
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					48,367
Total Carrying Value		49,140			49,140
Accumulated Depreciation		21,469			21,469
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		49,140
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,469
Western Region | SAN FRANCISCO, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					66,310
Initial Costs, Land and Land Improvements					145,665
Initial Costs, Buildings and Improvements					414,240
Total Initial Acquisition Costs					559,905
Costs of Improvements Capitalized Subsequent to Acquisition Costs					274,163
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					158,250
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					675,818
Total Carrying Value		834,068			834,068
Accumulated Depreciation		279,168			279,168
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		834,068
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		279,168
Western Region | Rosebeach
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,414
Initial Costs, Buildings and Improvements					17,449
Total Initial Acquisition Costs					25,863
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,450
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,760
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					20,553
Total Carrying Value		29,313			29,313
Accumulated Depreciation		12,675			12,675
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		29,313
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,675
Western Region | Other Southern CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					55,263
Initial Costs, Land and Land Improvements					25,884
Initial Costs, Buildings and Improvements					37,813
Total Initial Acquisition Costs					63,697
Costs of Improvements Capitalized Subsequent to Acquisition Costs					59,789
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					36,164
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					87,322
Total Carrying Value		123,486			123,486
Accumulated Depreciation		60,315			60,315
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		123,486
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		60,315
Western Region | Tierra Del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					43,078
Initial Costs, Land and Land Improvements					39,586
Initial Costs, Buildings and Improvements					36,679
Total Initial Acquisition Costs					76,265
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,250
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					39,674
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					39,841
Total Carrying Value		79,515			79,515
Accumulated Depreciation		18,883			18,883
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		79,515
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		18,883
Western Region | LOS ANGELES, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					110,778
Initial Costs, Land and Land Improvements					151,833
Initial Costs, Buildings and Improvements					156,492
Total Initial Acquisition Costs					308,325
Costs of Improvements Capitalized Subsequent to Acquisition Costs					134,580
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					160,611
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					282,294
Total Carrying Value		442,905			442,905
Accumulated Depreciation		110,320			110,320
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		442,905
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		110,320
Western Region | Crowne Pointe
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,486
Initial Costs, Buildings and Improvements					6,437
Total Initial Acquisition Costs					8,923
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,666
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,868
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,721
Total Carrying Value		14,589			14,589
Accumulated Depreciation		7,585			7,585
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		14,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,585
Western Region | Hilltop
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,174
Initial Costs, Buildings and Improvements					7,408
Total Initial Acquisition Costs					9,582
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,328
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,724
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,186
Total Carrying Value		13,910			13,910
Accumulated Depreciation		6,895			6,895
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,910
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,895
Western Region | The Kennedy
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,179
Initial Costs, Buildings and Improvements					22,307
Total Initial Acquisition Costs					28,486
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,931
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,272
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					24,145
Total Carrying Value		30,417			30,417
Accumulated Depreciation		13,947			13,947
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		30,417
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,947
Western Region | Hearthstone at Merrill Creek
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					22,591
Initial Costs, Land and Land Improvements					6,848
Initial Costs, Buildings and Improvements					30,922
Total Initial Acquisition Costs					37,770
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,829
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,975
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					34,624
Total Carrying Value		41,599			41,599
Accumulated Depreciation		15,574			15,574
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		41,599
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,574
Western Region | Island Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					21,284
Initial Costs, Buildings and Improvements					89,389
Total Initial Acquisition Costs					110,673
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,695
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,428
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					93,940
Total Carrying Value		115,368			115,368
Accumulated Depreciation		40,021			40,021
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		115,368
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,021
Western Region | SEATTLE, WA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					57,525
Initial Costs, Land and Land Improvements					103,975
Initial Costs, Buildings and Improvements					443,344
Total Initial Acquisition Costs					547,319
Costs of Improvements Capitalized Subsequent to Acquisition Costs					35,758
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					108,280
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					474,797
Total Carrying Value		583,077			583,077
Accumulated Depreciation		181,530			181,530
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		583,077
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		181,530
Western Region | Villas at Carlsbad
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,517
Initial Costs, Buildings and Improvements					10,718
Total Initial Acquisition Costs					17,235
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,876
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,780
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					13,331
Total Carrying Value		20,111			20,111
Accumulated Depreciation		7,826			7,826
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,111
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,826
Western Region | Boronda Manor
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,946
Initial Costs, Buildings and Improvements					8,982
Total Initial Acquisition Costs					10,928
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,534
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,195
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					17,267
Total Carrying Value		20,462			20,462
Accumulated Depreciation		9,244			9,244
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,462
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,244
Western Region | Garden Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					888
Initial Costs, Buildings and Improvements					4,188
Total Initial Acquisition Costs					5,076
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,435
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,559
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,952
Total Carrying Value		10,511			10,511
Accumulated Depreciation		4,981			4,981
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,511
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,981
Western Region | Cambridge Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,039
Initial Costs, Buildings and Improvements					12,883
Total Initial Acquisition Costs					15,922
Costs of Improvements Capitalized Subsequent to Acquisition Costs					14,767
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,302
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					25,387
Total Carrying Value		30,689			30,689
Accumulated Depreciation		13,958			13,958
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		30,689
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,958
Western Region | Laurel Tree
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,304
Initial Costs, Buildings and Improvements					5,115
Total Initial Acquisition Costs					6,419
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,080
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,188
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					10,311
Total Carrying Value		12,499			12,499
Accumulated Depreciation		5,627			5,627
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		12,499
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,627
Western Region | The Pointe At Harden Ranch
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,388
Initial Costs, Buildings and Improvements					23,854
Total Initial Acquisition Costs					30,242
Costs of Improvements Capitalized Subsequent to Acquisition Costs					27,357
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,021
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,578
Total Carrying Value		57,599			57,599
Accumulated Depreciation		24,926			24,926
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		57,599
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,926
Western Region | The Pointe At Northridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,044
Initial Costs, Buildings and Improvements					8,028
Total Initial Acquisition Costs					10,072
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,089
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,295
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,866
Total Carrying Value		20,161			20,161
Accumulated Depreciation		9,293			9,293
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,161
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,293
Western Region | The Pointe At Westlake
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,329
Initial Costs, Buildings and Improvements					5,334
Total Initial Acquisition Costs					6,663
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,364
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,181
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					10,846
Total Carrying Value		13,027			13,027
Accumulated Depreciation		5,700			5,700
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,027
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,700
Western Region | MONTEREY PENINSULA, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					16,938
Initial Costs, Buildings and Improvements					68,384
Total Initial Acquisition Costs					85,322
Costs of Improvements Capitalized Subsequent to Acquisition Costs					79,626
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					27,741
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					137,207
Total Carrying Value		164,948			164,948
Accumulated Depreciation		73,729			73,729
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		164,948
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		73,729
Western Region | Verano at Rancho Cucamonga Town Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					55,263
Initial Costs, Land and Land Improvements					13,557
Initial Costs, Buildings and Improvements					3,645
Total Initial Acquisition Costs					17,202
Costs of Improvements Capitalized Subsequent to Acquisition Costs					53,949
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					23,255
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,896
Total Carrying Value		71,151			71,151
Accumulated Depreciation		34,875			34,875
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		71,151
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		34,875
Western Region | Tualatin Heights
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,273
Initial Costs, Buildings and Improvements					9,134
Total Initial Acquisition Costs					12,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,745
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,841
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					15,311
Total Carrying Value		19,152			19,152
Accumulated Depreciation		10,231			10,231
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		19,152
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		10,231
Western Region | Hunt Club
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,014
Initial Costs, Buildings and Improvements					14,870
Total Initial Acquisition Costs					20,884
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,866
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,395
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,355
Total Carrying Value		27,750			27,750
Accumulated Depreciation		14,364			14,364
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		27,750
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,364
Western Region | PORTLAND, OR
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,287
Initial Costs, Buildings and Improvements					24,004
Total Initial Acquisition Costs					33,291
Costs of Improvements Capitalized Subsequent to Acquisition Costs					13,611
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,236
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					36,666
Total Carrying Value		46,902			46,902
Accumulated Depreciation		24,595			24,595
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,902
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,595
Mid Atlantic Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					507,412
Initial Costs, Land and Land Improvements					388,304
Initial Costs, Buildings and Improvements					1,550,755
Total Initial Acquisition Costs					1,939,059
Costs of Improvements Capitalized Subsequent to Acquisition Costs					598,125
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					464,660
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,072,524
Total Carrying Value		2,537,184			2,537,184
Accumulated Depreciation		647,723			647,723
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		2,537,184
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		647,723
Mid Atlantic Region | The Whitmore
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,418
Initial Costs, Buildings and Improvements					13,411
Total Initial Acquisition Costs					19,829
Costs of Improvements Capitalized Subsequent to Acquisition Costs					20,734
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,495
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,068
Total Carrying Value		40,563			40,563
Accumulated Depreciation		22,988			22,988
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,563
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,988
Mid Atlantic Region | Ridgewood
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,612
Initial Costs, Buildings and Improvements					20,086
Total Initial Acquisition Costs					25,698
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,522
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,014
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					28,206
Total Carrying Value		34,220			34,220
Accumulated Depreciation		20,340			20,340
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		34,220
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,340
Mid Atlantic Region | Wellington Place at Olde Town
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					32,037
Initial Costs, Land and Land Improvements					13,753
Initial Costs, Buildings and Improvements					36,059
Total Initial Acquisition Costs					49,812
Costs of Improvements Capitalized Subsequent to Acquisition Costs					17,416
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,740
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					52,488
Total Carrying Value		67,228			67,228
Accumulated Depreciation		35,000			35,000
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		67,228
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		35,000
Mid Atlantic Region | Andover House
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,357
Initial Costs, Buildings and Improvements					51,577
Total Initial Acquisition Costs					65,934
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,769
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,379
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					55,324
Total Carrying Value		69,703			69,703
Accumulated Depreciation		27,837			27,837
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		69,703
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,837
Mid Atlantic Region | Sullivan Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,137
Initial Costs, Buildings and Improvements					103,676
Total Initial Acquisition Costs					104,813
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,066
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,364
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					110,515
Total Carrying Value		111,879			111,879
Accumulated Depreciation		51,643			51,643
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		111,879
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		51,643
Mid Atlantic Region | Courts at Huntington Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					27,749
Initial Costs, Buildings and Improvements					111,878
Total Initial Acquisition Costs					139,627
Costs of Improvements Capitalized Subsequent to Acquisition Costs					78
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					27,749
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					111,956
Total Carrying Value		139,705			139,705
Accumulated Depreciation		1,682			1,682
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		139,705
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,682
Mid Atlantic Region | Circle Towers
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					70,884
Initial Costs, Land and Land Improvements					32,815
Initial Costs, Buildings and Improvements					107,051
Total Initial Acquisition Costs					139,866
Costs of Improvements Capitalized Subsequent to Acquisition Costs					13,056
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					33,357
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					119,565
Total Carrying Value		152,922			152,922
Accumulated Depreciation		53,022			53,022
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		152,922
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		53,022
Mid Atlantic Region | Delancey at Shirlington
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					21,606
Initial Costs, Buildings and Improvements					66,765
Total Initial Acquisition Costs					88,371
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,195
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,632
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					68,934
Total Carrying Value		90,566			90,566
Accumulated Depreciation		30,609			30,609
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		90,566
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		30,609
Mid Atlantic Region | METROPOLITAN DC
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					407,067
Initial Costs, Land and Land Improvements					345,666
Initial Costs, Buildings and Improvements					1,307,924
Total Initial Acquisition Costs					1,653,590
Costs of Improvements Capitalized Subsequent to Acquisition Costs					454,931
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					406,934
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,701,587
Total Carrying Value		2,108,521			2,108,521
Accumulated Depreciation		403,882			403,882
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		2,108,521
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		403,882
Mid Atlantic Region | Lakeside Mill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					12,569
Initial Costs, Land and Land Improvements					2,666
Initial Costs, Buildings and Improvements					10,109
Total Initial Acquisition Costs					12,775
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,038
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,997
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					14,816
Total Carrying Value		17,813			17,813
Accumulated Depreciation		11,336			11,336
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		17,813
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,336
Mid Atlantic Region | Calvert’s Walk
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,408
Initial Costs, Buildings and Improvements					24,692
Total Initial Acquisition Costs					29,100
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,396
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,817
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,679
Total Carrying Value		36,496			36,496
Accumulated Depreciation		20,827			20,827
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,496
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,827
Mid Atlantic Region | Liriope Apartments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,620
Initial Costs, Buildings and Improvements					6,791
Total Initial Acquisition Costs					8,411
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,374
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,653
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,132
Total Carrying Value		9,785			9,785
Accumulated Depreciation		5,352			5,352
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,785
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,352
Mid Atlantic Region | 20 Lambourne
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					30,132
Initial Costs, Land and Land Improvements					11,750
Initial Costs, Buildings and Improvements					45,590
Total Initial Acquisition Costs					57,340
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,406
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					12,106
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					51,640
Total Carrying Value		63,746			63,746
Accumulated Depreciation		24,313			24,313
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,746
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,313
Mid Atlantic Region | BALTIMORE, MD
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					65,778
Initial Costs, Land and Land Improvements					37,515
Initial Costs, Buildings and Improvements					181,923
Total Initial Acquisition Costs					219,438
Costs of Improvements Capitalized Subsequent to Acquisition Costs					67,997
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					43,088
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					244,347
Total Carrying Value		287,435			287,435
Accumulated Depreciation		146,424			146,424
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		287,435
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		146,424
Mid Atlantic Region | DelRey Tower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					297
Initial Costs, Buildings and Improvements					12,786
Total Initial Acquisition Costs					13,083
Costs of Improvements Capitalized Subsequent to Acquisition Costs					113,357
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,461
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					116,979
Total Carrying Value		126,440			126,440
Accumulated Depreciation		9,914			9,914
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		126,440
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,914
Southeastern Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					170,986
Initial Costs, Land and Land Improvements					86,349
Initial Costs, Buildings and Improvements					355,426
Total Initial Acquisition Costs					441,775
Costs of Improvements Capitalized Subsequent to Acquisition Costs					288,284
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					118,304
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					611,755
Total Carrying Value		730,059			730,059
Accumulated Depreciation		425,591			425,591
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		730,059
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		425,591
Southeastern Region | Inlet Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					7,702
Initial Costs, Buildings and Improvements					23,150
Total Initial Acquisition Costs					30,852
Costs of Improvements Capitalized Subsequent to Acquisition Costs					15,659
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,304
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					37,207
Total Carrying Value		46,511			46,511
Accumulated Depreciation		27,055			27,055
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,511
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,055
Southeastern Region | MacAlpine Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,869
Initial Costs, Buildings and Improvements					36,858
Total Initial Acquisition Costs					47,727
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,862
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,545
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					44,044
Total Carrying Value		55,589			55,589
Accumulated Depreciation		28,780			28,780
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		55,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		28,780
Southeastern Region | TAMPA, FL
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					30,943
Initial Costs, Land and Land Improvements					32,324
Initial Costs, Buildings and Improvements					122,652
Total Initial Acquisition Costs					154,976
Costs of Improvements Capitalized Subsequent to Acquisition Costs					85,244
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					48,373
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					191,847
Total Carrying Value		240,220			240,220
Accumulated Depreciation		131,728			131,728
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		240,220
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		131,728
Southeastern Region | Legacy Hill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,148
Initial Costs, Buildings and Improvements					5,867
Total Initial Acquisition Costs					7,015
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,807
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,764
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					14,058
Total Carrying Value		15,822			15,822
Accumulated Depreciation		11,246			11,246
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		15,822
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,246
Southeastern Region | Hickory Run
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,469
Initial Costs, Buildings and Improvements					11,584
Total Initial Acquisition Costs					13,053
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,459
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,155
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,357
Total Carrying Value		23,512			23,512
Accumulated Depreciation		14,244			14,244
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		23,512
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,244
Southeastern Region | Carrington Hills
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,117
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					2,117
Costs of Improvements Capitalized Subsequent to Acquisition Costs					34,535
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,506
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					32,146
Total Carrying Value		36,652			36,652
Accumulated Depreciation		21,305			21,305
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,652
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,305
Southeastern Region | Brookridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					708
Initial Costs, Buildings and Improvements					5,461
Total Initial Acquisition Costs					6,169
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,830
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,162
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					9,837
Total Carrying Value		10,999			10,999
Accumulated Depreciation		7,007			7,007
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,999
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,007
Southeastern Region | Breckenridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					766
Initial Costs, Buildings and Improvements					7,714
Total Initial Acquisition Costs					8,480
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,646
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,285
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,841
Total Carrying Value		13,126			13,126
Accumulated Depreciation		8,155			8,155
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,126
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		8,155
Southeastern Region | Polo Park
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,583
Initial Costs, Buildings and Improvements					16,293
Total Initial Acquisition Costs					20,876
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,508
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,741
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,643
Total Carrying Value		37,384			37,384
Accumulated Depreciation		22,411			22,411
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		37,384
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,411
Southeastern Region | NASHVILLE, TN
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					38,481
Initial Costs, Land and Land Improvements					15,433
Initial Costs, Buildings and Improvements					87,608
Total Initial Acquisition Costs					103,041
Costs of Improvements Capitalized Subsequent to Acquisition Costs					92,982
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					22,206
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					173,817
Total Carrying Value		196,023			196,023
Accumulated Depreciation		117,692			117,692
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		196,023
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		117,692
Southeastern Region | The Reserve and Park at Riverbridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					15,968
Initial Costs, Buildings and Improvements					56,401
Total Initial Acquisition Costs					72,369
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,823
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,602
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,590
Total Carrying Value		82,192			82,192
Accumulated Depreciation		40,676			40,676
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		82,192
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,676
Southeastern Region | OTHER FLORIDA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					15,968
Initial Costs, Buildings and Improvements					56,401
Total Initial Acquisition Costs					72,369
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,823
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,602
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,590
Total Carrying Value		82,192			82,192
Accumulated Depreciation		40,676			40,676
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		82,192
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,676
Northeast Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					77,066
Initial Costs, Land and Land Improvements					317,831
Initial Costs, Buildings and Improvements					1,182,479
Total Initial Acquisition Costs					1,500,310
Costs of Improvements Capitalized Subsequent to Acquisition Costs					337,084
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					317,479
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,519,915
Total Carrying Value		1,837,394			1,837,394
Accumulated Depreciation		344,653			344,653
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,837,394
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		344,653
Northeast Region | Inwood West
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					54,919
Initial Costs, Land and Land Improvements					20,778
Initial Costs, Buildings and Improvements					88,096
Total Initial Acquisition Costs					108,874
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,121
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					19,324
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					94,671
Total Carrying Value		113,995			113,995
Accumulated Depreciation		26,028			26,028
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		113,995
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		26,028
Northeast Region | 14 North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,961
Initial Costs, Buildings and Improvements					51,175
Total Initial Acquisition Costs					62,136
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,359
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,077
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					57,418
Total Carrying Value		68,495			68,495
Accumulated Depreciation		16,632			16,632
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		68,495
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,632
Northeast Region | BOSTON, MA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					77,066
Initial Costs, Land and Land Improvements					67,953
Initial Costs, Buildings and Improvements					265,167
Total Initial Acquisition Costs					333,120
Costs of Improvements Capitalized Subsequent to Acquisition Costs					210,880
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					66,733
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					477,267
Total Carrying Value		544,000			544,000
Accumulated Depreciation		90,744			90,744
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		544,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		90,744
Northeast Region | 10 Hanover Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					41,432
Initial Costs, Buildings and Improvements					218,983
Total Initial Acquisition Costs					260,415
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,730
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					41,496
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					228,649
Total Carrying Value		270,145			270,145
Accumulated Depreciation		54,457			54,457
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		270,145
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		54,457
Northeast Region | 95 Wall Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					57,637
Initial Costs, Buildings and Improvements					266,255
Total Initial Acquisition Costs					323,892
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,110
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					57,810
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					273,192
Total Carrying Value		331,002			331,002
Accumulated Depreciation		71,769			71,769
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		331,002
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		71,769
Northeast Region | NEW YORK, NY
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					249,878
Initial Costs, Buildings and Improvements					917,312
Total Initial Acquisition Costs					1,167,190
Costs of Improvements Capitalized Subsequent to Acquisition Costs					126,204
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					250,746
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,042,648
Total Carrying Value		1,293,394			1,293,394
Accumulated Depreciation		253,909			253,909
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,293,394
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		253,909
Southwestern Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					148,394
Initial Costs, Land and Land Improvements					99,870
Initial Costs, Buildings and Improvements					257,677
Total Initial Acquisition Costs					357,547
Costs of Improvements Capitalized Subsequent to Acquisition Costs					89,898
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					115,906
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					331,539
Total Carrying Value		447,445			447,445
Accumulated Depreciation		170,852			170,852
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		447,445
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		170,852
Southwestern Region | THIRTY377
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					29,361
Initial Costs, Land and Land Improvements					24,036
Initial Costs, Buildings and Improvements					32,951
Total Initial Acquisition Costs					56,987
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,332
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					24,382
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					41,937
Total Carrying Value		66,319			66,319
Accumulated Depreciation		24,256			24,256
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		66,319
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,256
Southwestern Region | Legacy Village
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					82,734
Initial Costs, Land and Land Improvements					16,882
Initial Costs, Buildings and Improvements					100,102
Total Initial Acquisition Costs					116,984
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,827
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					17,407
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					108,404
Total Carrying Value		125,811			125,811
Accumulated Depreciation		50,919			50,919
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		125,811
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		50,919
Southwestern Region | DALLAS, TX
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					112,095
Initial Costs, Land and Land Improvements					83,453
Initial Costs, Buildings and Improvements					153,637
Total Initial Acquisition Costs					237,090
Costs of Improvements Capitalized Subsequent to Acquisition Costs					60,036
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					97,144
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					199,982
Total Carrying Value		297,126			297,126
Accumulated Depreciation		112,394			112,394
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		297,126
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		112,394
Southwestern Region | Barton Creek Landing
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,151
Initial Costs, Buildings and Improvements					14,269
Total Initial Acquisition Costs					17,420
Costs of Improvements Capitalized Subsequent to Acquisition Costs					22,588
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,913
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					35,095
Total Carrying Value		40,008			40,008
Accumulated Depreciation		22,924			22,924
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,008
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,924
Southwestern Region | AUSTIN, TX
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,299
Initial Costs, Land and Land Improvements					16,417
Initial Costs, Buildings and Improvements					104,040
Total Initial Acquisition Costs					120,457
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,862
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					18,762
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					131,557
Total Carrying Value		150,319			150,319
Accumulated Depreciation		58,458			58,458
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		150,319
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		58,458
United Dominion Reality L.P.
Real Estate and Accumulated Depreciation [Line Items]
Deferred Finance Costs, Net					(2,199)	(4,500)
Total Carrying Value		4,238,770	4,188,480	4,182,920	3,630,905	4,238,770	4,188,480
Accumulated Depreciation		1,403,303	1,241,574	1,097,133	1,281,258	1,403,303	1,241,574
Aggregate cost for federal income tax purposes					3,000,000
Real Estate Owned, Gross [Roll Forward]
Balance at beginning of the year		4,238,770	4,188,480	4,182,920
Real estate acquired		139,627		0
Capital expenditures and development		61,196	91,682	151,002
Real estate sold		(180,069)	(41,013)	(70,687)
Real Estate Investment Property, at Cost					3,630,905	4,238,770
Hurricane related impairment of assets		(140)	(379)	0
Balance at end of the year		3,630,905	4,238,770	4,188,480
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at beginning of the year		1,403,303	1,241,574	1,097,133
Depreciation expense for the year		168,495	178,719	179,404
Accumulated depreciation on sales		(67,177)	(16,674)	(34,794)
Write off of accumulated depreciation on hurricane related impaired assets		0	(316)	0
Balance at end of year		$ 1,281,258	1,403,303	1,241,574
United Dominion Reality L.P. | Estimated depreciable lives of buildings range beginning
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life for all buildings		35 years
United Dominion Reality L.P. | Estimated depreciable lives of buildings range end
Real Estate and Accumulated Depreciation [Line Items]
Depreciable life for all buildings		55 years
United Dominion Reality L.P. | Los Alisos
Real Estate Owned, Gross [Roll Forward]
Retirement of fully depreciated assets		$ 0	0	(74,755)
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Accumulated depreciation on retirements of fully depreciated asset		0	0	(169)
United Dominion Reality L.P. | Other
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	[2]				0
Initial Costs, Land and Land Improvements	[2]				0
Initial Costs, Buildings and Improvements	[2]				0
Total Initial Acquisition Costs	[2]				0
Costs of Improvements Capitalized Subsequent to Acquisition Costs	[2]				1,093
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	[2]				0
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	[2]				1,093
Total Carrying Value	[2]	1,093			1,093
Accumulated Depreciation	[2]	0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year	[2]	1,093
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year	[2]	0
United Dominion Reality L.P. | TOTAL CORPORATE
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					0
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					0
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,093
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					0
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,093
Total Carrying Value		1,093			1,093
Accumulated Depreciation		0			0
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,093
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		0
United Dominion Reality L.P. | Commercial Held for Development
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,407
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					1,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,021
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,380
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,048
Total Carrying Value		7,428			7,428
Accumulated Depreciation		2,683			2,683
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		7,428
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,683
United Dominion Reality L.P. | Commercial Held for Development | Office Building [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,407
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					1,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,021
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,380
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,048
Total Carrying Value		7,428			7,428
Accumulated Depreciation		2,683			2,683
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		7,428
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,683
United Dominion Reality L.P. | Commercial Held for Development | TOTAL COMMERCIAL & CORPORATE
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,407
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					1,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,114
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,380
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					7,141
Total Carrying Value		8,521			8,521
Accumulated Depreciation		2,683			2,683
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		8,521
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		2,683
United Dominion Reality L.P. | Commercial Held for Development | Total Real Estate Owned
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					475,964
Initial Costs, Land and Land Improvements					748,578
Initial Costs, Buildings and Improvements					2,082,113
Total Initial Acquisition Costs					2,830,691
Costs of Improvements Capitalized Subsequent to Acquisition Costs					812,808
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					833,300
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,797,605
Total Carrying Value		3,630,905			3,630,905
Accumulated Depreciation		1,281,258			1,281,258
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		3,630,905
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,281,258
United Dominion Reality L.P. | Western Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					364,246
Initial Costs, Land and Land Improvements					508,462
Initial Costs, Buildings and Improvements					959,128
Total Initial Acquisition Costs					1,467,590
Costs of Improvements Capitalized Subsequent to Acquisition Costs					498,944
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					572,193
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					1,381,812
Total Carrying Value		1,954,005			1,954,005
Accumulated Depreciation		746,659			746,659
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		1,954,005
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		746,659
United Dominion Reality L.P. | Western Region | Harbor at Mesa Verde
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					61,050
Initial Costs, Land and Land Improvements					20,476
Initial Costs, Buildings and Improvements					28,538
Total Initial Acquisition Costs					49,014
Costs of Improvements Capitalized Subsequent to Acquisition Costs					14,641
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,314
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					42,341
Total Carrying Value		63,655			63,655
Accumulated Depreciation		27,697			27,697
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,655
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,697
United Dominion Reality L.P. | Western Region | 27 Seventy FIve Mesa Verde [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,423
Initial Costs, Land and Land Improvements					99,329
Initial Costs, Buildings and Improvements					110,644
Total Initial Acquisition Costs					209,973
Costs of Improvements Capitalized Subsequent to Acquisition Costs					92,673
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					112,650
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					189,996
Total Carrying Value		302,646			302,646
Accumulated Depreciation		87,007			87,007
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		302,646
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		87,007
United Dominion Reality L.P. | Western Region | Pacific Shores
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					42,552
Initial Costs, Land and Land Improvements					7,345
Initial Costs, Buildings and Improvements					22,624
Total Initial Acquisition Costs					29,969
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,913
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,913
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,969
Total Carrying Value		39,882			39,882
Accumulated Depreciation		20,771			20,771
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		39,882
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,771
United Dominion Reality L.P. | Western Region | Huntington Vista
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					36,980
Initial Costs, Land and Land Improvements					8,055
Initial Costs, Buildings and Improvements					22,486
Total Initial Acquisition Costs					30,541
Costs of Improvements Capitalized Subsequent to Acquisition Costs					11,612
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,713
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,440
Total Carrying Value		42,153			42,153
Accumulated Depreciation		19,810			19,810
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		42,153
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,810
United Dominion Reality L.P. | Western Region | Missions at Back Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					229
Initial Costs, Buildings and Improvements					14,129
Total Initial Acquisition Costs					14,358
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,526
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,874
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					6,010
Total Carrying Value		16,884			16,884
Accumulated Depreciation		4,229			4,229
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		16,884
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,229
United Dominion Reality L.P. | Western Region | Coronado at Newport — North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					62,516
Initial Costs, Buildings and Improvements					46,082
Total Initial Acquisition Costs					108,598
Costs of Improvements Capitalized Subsequent to Acquisition Costs					29,014
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					66,770
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					70,842
Total Carrying Value		137,612			137,612
Accumulated Depreciation		44,814			44,814
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		137,612
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		44,814
United Dominion Reality L.P. | Western Region | Vista Del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,670
Initial Costs, Buildings and Improvements					7,080
Total Initial Acquisition Costs					17,750
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,502
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,988
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					9,264
Total Carrying Value		20,252			20,252
Accumulated Depreciation		6,117			6,117
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,252
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,117
United Dominion Reality L.P. | Western Region | Coronado South
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					58,785
Initial Costs, Buildings and Improvements					50,067
Total Initial Acquisition Costs					108,852
Costs of Improvements Capitalized Subsequent to Acquisition Costs					19,393
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					59,278
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					68,967
Total Carrying Value		128,245			128,245
Accumulated Depreciation		43,476			43,476
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		128,245
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		43,476
United Dominion Reality L.P. | Western Region | ORANGE COUNTY, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					177,005
Initial Costs, Land and Land Improvements					267,405
Initial Costs, Buildings and Improvements					301,650
Total Initial Acquisition Costs					569,055
Costs of Improvements Capitalized Subsequent to Acquisition Costs					182,274
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					298,500
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					452,829
Total Carrying Value		751,329			751,329
Accumulated Depreciation		253,921			253,921
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		751,329
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		253,921
United Dominion Reality L.P. | Western Region | 2000 Post Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,861
Initial Costs, Buildings and Improvements					44,578
Total Initial Acquisition Costs					54,439
Costs of Improvements Capitalized Subsequent to Acquisition Costs					30,040
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,249
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					61,701
Total Carrying Value		71,950			71,950
Accumulated Depreciation		25,684			25,684
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		71,950
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,684
United Dominion Reality L.P. | Western Region | Birch Creek
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,365
Initial Costs, Buildings and Improvements					16,696
Total Initial Acquisition Costs					21,061
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,536
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,139
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					23,458
Total Carrying Value		28,597			28,597
Accumulated Depreciation		13,756			13,756
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		28,597
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,756
United Dominion Reality L.P. | Western Region | Highlands Of Marin
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,996
Initial Costs, Buildings and Improvements					24,868
Total Initial Acquisition Costs					30,864
Costs of Improvements Capitalized Subsequent to Acquisition Costs					26,063
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					7,257
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					49,670
Total Carrying Value		56,927			56,927
Accumulated Depreciation		29,237			29,237
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		56,927
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		29,237
United Dominion Reality L.P. | Western Region | Marina Playa
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,224
Initial Costs, Buildings and Improvements					23,916
Total Initial Acquisition Costs					30,140
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,032
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,938
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					33,234
Total Carrying Value		40,172			40,172
Accumulated Depreciation		19,547			19,547
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		40,172
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		19,547
United Dominion Reality L.P. | Western Region | River Terrace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,310
Initial Costs, Land and Land Improvements					22,161
Initial Costs, Buildings and Improvements					40,137
Total Initial Acquisition Costs					62,298
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,307
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					22,428
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					44,177
Total Carrying Value		66,605			66,605
Accumulated Depreciation		25,943			25,943
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		66,605
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		25,943
United Dominion Reality L.P. | Western Region | CitySouth
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,031
Initial Costs, Buildings and Improvements					30,537
Total Initial Acquisition Costs					44,568
Costs of Improvements Capitalized Subsequent to Acquisition Costs					35,627
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,290
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					63,905
Total Carrying Value		80,195			80,195
Accumulated Depreciation		36,437			36,437
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		80,195
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		36,437
United Dominion Reality L.P. | Western Region | Bay Terrace
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,545
Initial Costs, Buildings and Improvements					14,458
Total Initial Acquisition Costs					23,003
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,046
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,458
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,591
Total Carrying Value		28,049			28,049
Accumulated Depreciation		9,622			9,622
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		28,049
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,622
United Dominion Reality L.P. | Western Region | Highlands of Marin Phase II
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,353
Initial Costs, Buildings and Improvements					18,559
Total Initial Acquisition Costs					23,912
Costs of Improvements Capitalized Subsequent to Acquisition Costs					11,088
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,758
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					29,242
Total Carrying Value		35,000			35,000
Accumulated Depreciation		15,221			15,221
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		35,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,221
United Dominion Reality L.P. | Western Region | Edgewater
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					30,657
Initial Costs, Buildings and Improvements					83,872
Total Initial Acquisition Costs					114,529
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,689
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					30,690
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					87,528
Total Carrying Value		118,218			118,218
Accumulated Depreciation		39,217			39,217
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		118,218
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		39,217
United Dominion Reality L.P. | Western Region | Almaden Lake Village
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					27,000
Initial Costs, Land and Land Improvements					594
Initial Costs, Buildings and Improvements					42,515
Total Initial Acquisition Costs					43,109
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,031
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					773
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					48,367
Total Carrying Value		49,140			49,140
Accumulated Depreciation		21,469			21,469
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		49,140
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,469
United Dominion Reality L.P. | Western Region | SAN FRANCISCO, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					66,310
Initial Costs, Land and Land Improvements					107,787
Initial Costs, Buildings and Improvements					340,136
Total Initial Acquisition Costs					447,923
Costs of Improvements Capitalized Subsequent to Acquisition Costs					139,459
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					116,980
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					457,873
Total Carrying Value		574,853			574,853
Accumulated Depreciation		236,133			236,133
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		574,853
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		236,133
United Dominion Reality L.P. | Western Region | Rosebeach
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					8,414
Initial Costs, Buildings and Improvements					17,449
Total Initial Acquisition Costs					25,863
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,450
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					8,760
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					20,553
Total Carrying Value		29,313			29,313
Accumulated Depreciation		12,675			12,675
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		29,313
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		12,675
United Dominion Reality L.P. | Western Region | Other Southern CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					55,262
Initial Costs, Land and Land Improvements					20,074
Initial Costs, Buildings and Improvements					14,363
Total Initial Acquisition Costs					34,437
Costs of Improvements Capitalized Subsequent to Acquisition Costs					56,825
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					30,035
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					61,227
Total Carrying Value		91,262			91,262
Accumulated Depreciation		42,701			42,701
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		91,262
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		42,701
United Dominion Reality L.P. | Western Region | Tierra Del Rey
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					43,078
Initial Costs, Land and Land Improvements					39,586
Initial Costs, Buildings and Improvements					36,679
Total Initial Acquisition Costs					76,265
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,250
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					39,674
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					39,841
Total Carrying Value		79,515			79,515
Accumulated Depreciation		18,883			18,883
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		79,515
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		18,883
United Dominion Reality L.P. | Western Region | LOS ANGELES, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					43,078
Initial Costs, Land and Land Improvements					48,000
Initial Costs, Buildings and Improvements					54,128
Total Initial Acquisition Costs					102,128
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,700
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					48,434
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					60,394
Total Carrying Value		108,828			108,828
Accumulated Depreciation		31,558			31,558
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		108,828
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		31,558
United Dominion Reality L.P. | Western Region | Crowne Pointe
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,486
Initial Costs, Buildings and Improvements					6,437
Total Initial Acquisition Costs					8,923
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,666
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,868
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,721
Total Carrying Value		14,589			14,589
Accumulated Depreciation		7,585			7,585
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		14,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,585
United Dominion Reality L.P. | Western Region | Hilltop
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,174
Initial Costs, Buildings and Improvements					7,408
Total Initial Acquisition Costs					9,582
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,328
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,724
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,186
Total Carrying Value		13,910			13,910
Accumulated Depreciation		6,895			6,895
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,910
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		6,895
United Dominion Reality L.P. | Western Region | The Kennedy
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,179
Initial Costs, Buildings and Improvements					22,307
Total Initial Acquisition Costs					28,486
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,931
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,272
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					24,145
Total Carrying Value		30,417			30,417
Accumulated Depreciation		13,947			13,947
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		30,417
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,947
United Dominion Reality L.P. | Western Region | Hearthstone at Merrill Creek
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					22,591
Initial Costs, Land and Land Improvements					6,848
Initial Costs, Buildings and Improvements					30,922
Total Initial Acquisition Costs					37,770
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,829
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,975
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					34,624
Total Carrying Value		41,599			41,599
Accumulated Depreciation		15,574			15,574
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		41,599
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		15,574
United Dominion Reality L.P. | Western Region | Island Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					21,284
Initial Costs, Buildings and Improvements					89,389
Total Initial Acquisition Costs					110,673
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,695
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,428
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					93,940
Total Carrying Value		115,368			115,368
Accumulated Depreciation		40,021			40,021
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		115,368
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,021
United Dominion Reality L.P. | Western Region | SEATTLE, WA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					22,591
Initial Costs, Land and Land Improvements					38,971
Initial Costs, Buildings and Improvements					156,463
Total Initial Acquisition Costs					195,434
Costs of Improvements Capitalized Subsequent to Acquisition Costs					20,449
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					40,267
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					175,616
Total Carrying Value		215,883			215,883
Accumulated Depreciation		84,022			84,022
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		215,883
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		84,022
United Dominion Reality L.P. | Western Region | Villas at Carlsbad
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,517
Initial Costs, Buildings and Improvements					10,718
Total Initial Acquisition Costs					17,235
Costs of Improvements Capitalized Subsequent to Acquisition Costs					2,876
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,780
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					13,331
Total Carrying Value		20,111			20,111
Accumulated Depreciation		7,826			7,826
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,111
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,826
United Dominion Reality L.P. | Western Region | Boronda Manor
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,946
Initial Costs, Buildings and Improvements					8,982
Total Initial Acquisition Costs					10,928
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,534
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,195
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					17,267
Total Carrying Value		20,462			20,462
Accumulated Depreciation		9,244			9,244
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,462
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,244
United Dominion Reality L.P. | Western Region | Garden Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					888
Initial Costs, Buildings and Improvements					4,188
Total Initial Acquisition Costs					5,076
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,435
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,559
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,952
Total Carrying Value		10,511			10,511
Accumulated Depreciation		4,981			4,981
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,511
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		4,981
United Dominion Reality L.P. | Western Region | Cambridge Court
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,039
Initial Costs, Buildings and Improvements					12,883
Total Initial Acquisition Costs					15,922
Costs of Improvements Capitalized Subsequent to Acquisition Costs					14,767
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,302
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					25,387
Total Carrying Value		30,689			30,689
Accumulated Depreciation		13,958			13,958
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		30,689
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		13,958
United Dominion Reality L.P. | Western Region | Laurel Tree
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,304
Initial Costs, Buildings and Improvements					5,115
Total Initial Acquisition Costs					6,419
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,080
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,188
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					10,311
Total Carrying Value		12,499			12,499
Accumulated Depreciation		5,627			5,627
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		12,499
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,627
United Dominion Reality L.P. | Western Region | The Pointe At Harden Ranch
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,388
Initial Costs, Buildings and Improvements					23,854
Total Initial Acquisition Costs					30,242
Costs of Improvements Capitalized Subsequent to Acquisition Costs					27,357
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,021
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,578
Total Carrying Value		57,599			57,599
Accumulated Depreciation		24,926			24,926
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		57,599
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,926
United Dominion Reality L.P. | Western Region | The Pointe At Northridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,044
Initial Costs, Buildings and Improvements					8,028
Total Initial Acquisition Costs					10,072
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,089
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,295
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					16,866
Total Carrying Value		20,161			20,161
Accumulated Depreciation		9,293			9,293
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		20,161
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,293
United Dominion Reality L.P. | Western Region | The Pointe At Westlake
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,329
Initial Costs, Buildings and Improvements					5,334
Total Initial Acquisition Costs					6,663
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,364
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,181
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					10,846
Total Carrying Value		13,027			13,027
Accumulated Depreciation		5,700			5,700
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,027
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,700
United Dominion Reality L.P. | Western Region | MONTEREY PENINSULA, CA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					16,938
Initial Costs, Buildings and Improvements					68,384
Total Initial Acquisition Costs					85,322
Costs of Improvements Capitalized Subsequent to Acquisition Costs					79,626
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					27,741
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					137,207
Total Carrying Value		164,948			164,948
Accumulated Depreciation		73,729			73,729
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		164,948
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		73,729
United Dominion Reality L.P. | Western Region | Verano at Rancho Cucamonga Town Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					55,262
Initial Costs, Land and Land Improvements					13,557
Initial Costs, Buildings and Improvements					3,645
Total Initial Acquisition Costs					17,202
Costs of Improvements Capitalized Subsequent to Acquisition Costs					53,949
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					23,255
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					47,896
Total Carrying Value		71,151			71,151
Accumulated Depreciation		34,875			34,875
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		71,151
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		34,875
United Dominion Reality L.P. | Western Region | Tualatin Heights
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					3,273
Initial Costs, Buildings and Improvements					9,134
Total Initial Acquisition Costs					12,407
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,745
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					3,841
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					15,311
Total Carrying Value		19,152			19,152
Accumulated Depreciation		10,231			10,231
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		19,152
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		10,231
United Dominion Reality L.P. | Western Region | Hunt Club
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					6,014
Initial Costs, Buildings and Improvements					14,870
Total Initial Acquisition Costs					20,884
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,866
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,395
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,355
Total Carrying Value		27,750			27,750
Accumulated Depreciation		14,364			14,364
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		27,750
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,364
United Dominion Reality L.P. | Western Region | PORTLAND, OR
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					9,287
Initial Costs, Buildings and Improvements					24,004
Total Initial Acquisition Costs					33,291
Costs of Improvements Capitalized Subsequent to Acquisition Costs					13,611
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					10,236
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					36,666
Total Carrying Value		46,902			46,902
Accumulated Depreciation		24,595			24,595
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,902
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,595
United Dominion Reality L.P. | Mid Atlantic Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					74,738
Initial Costs, Land and Land Improvements					83,349
Initial Costs, Buildings and Improvements					423,244
Total Initial Acquisition Costs					506,593
Costs of Improvements Capitalized Subsequent to Acquisition Costs					170,422
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					95,280
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					581,670
Total Carrying Value		676,950			676,950
Accumulated Depreciation		208,179			208,179
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		676,950
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		208,179
United Dominion Reality L.P. | Mid Atlantic Region | Ridgewood
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					5,612
Initial Costs, Buildings and Improvements					20,086
Total Initial Acquisition Costs					25,698
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,522
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					6,014
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					28,206
Total Carrying Value		34,220			34,220
Accumulated Depreciation		20,340			20,340
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		34,220
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,340
United Dominion Reality L.P. | Mid Atlantic Region | Wellington Place at Olde Town
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					32,037
Initial Costs, Land and Land Improvements					13,753
Initial Costs, Buildings and Improvements					36,059
Total Initial Acquisition Costs					49,812
Costs of Improvements Capitalized Subsequent to Acquisition Costs					17,416
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,740
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					52,488
Total Carrying Value		67,228			67,228
Accumulated Depreciation		35,000			35,000
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		67,228
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		35,000
United Dominion Reality L.P. | Mid Atlantic Region | Andover House
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					14,357
Initial Costs, Buildings and Improvements					51,577
Total Initial Acquisition Costs					65,934
Costs of Improvements Capitalized Subsequent to Acquisition Costs					3,769
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					14,379
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					55,324
Total Carrying Value		69,703			69,703
Accumulated Depreciation		27,837			27,837
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		69,703
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,837
United Dominion Reality L.P. | Mid Atlantic Region | Sullivan Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,137
Initial Costs, Buildings and Improvements					103,676
Total Initial Acquisition Costs					104,813
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,066
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,364
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					110,450
Total Carrying Value		111,814			111,814
Accumulated Depreciation		51,578			51,578
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		111,814
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		51,578
United Dominion Reality L.P. | Mid Atlantic Region | Courts at Huntington Station [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					27,749
Initial Costs, Buildings and Improvements					111,878
Total Initial Acquisition Costs					139,627
Costs of Improvements Capitalized Subsequent to Acquisition Costs					78
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					27,749
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					111,956
Total Carrying Value		139,705			139,705
Accumulated Depreciation		1,682			1,682
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		139,705
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,682
United Dominion Reality L.P. | Mid Atlantic Region | METROPOLITAN DC
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					32,037
Initial Costs, Land and Land Improvements					62,905
Initial Costs, Buildings and Improvements					336,062
Total Initial Acquisition Costs					398,967
Costs of Improvements Capitalized Subsequent to Acquisition Costs					150,208
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					73,707
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					475,403
Total Carrying Value		549,110			549,110
Accumulated Depreciation		146,351			146,351
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		549,110
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		146,351
United Dominion Reality L.P. | Mid Atlantic Region | Lakeside Mill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					12,569
Initial Costs, Land and Land Improvements					2,666
Initial Costs, Buildings and Improvements					10,109
Total Initial Acquisition Costs					12,775
Costs of Improvements Capitalized Subsequent to Acquisition Costs					5,038
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,997
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					14,816
Total Carrying Value		17,813			17,813
Accumulated Depreciation		11,336			11,336
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		17,813
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,336
United Dominion Reality L.P. | Mid Atlantic Region | Calvert’s Walk
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,408
Initial Costs, Buildings and Improvements					24,692
Total Initial Acquisition Costs					29,100
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,396
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,817
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,679
Total Carrying Value		36,496			36,496
Accumulated Depreciation		20,827			20,827
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,496
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		20,827
United Dominion Reality L.P. | Mid Atlantic Region | Liriope Apartments
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,620
Initial Costs, Buildings and Improvements					6,791
Total Initial Acquisition Costs					8,411
Costs of Improvements Capitalized Subsequent to Acquisition Costs					1,374
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,653
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					8,132
Total Carrying Value		9,785			9,785
Accumulated Depreciation		5,352			5,352
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		9,785
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		5,352
United Dominion Reality L.P. | Mid Atlantic Region | 20 Lambourne
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					30,132
Initial Costs, Land and Land Improvements					11,750
Initial Costs, Buildings and Improvements					45,590
Total Initial Acquisition Costs					57,340
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,406
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					12,106
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					51,640
Total Carrying Value		63,746			63,746
Accumulated Depreciation		24,313			24,313
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		63,746
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		24,313
United Dominion Reality L.P. | Mid Atlantic Region | BALTIMORE, MD
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					42,701
Initial Costs, Land and Land Improvements					20,444
Initial Costs, Buildings and Improvements					87,182
Total Initial Acquisition Costs					107,626
Costs of Improvements Capitalized Subsequent to Acquisition Costs					20,214
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					21,573
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					106,267
Total Carrying Value		127,840			127,840
Accumulated Depreciation		61,828			61,828
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		127,840
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		61,828
United Dominion Reality L.P. | Mid Atlantic Region | DelRey Tower [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					297
Initial Costs, Buildings and Improvements					12,786
Total Initial Acquisition Costs					13,083
Costs of Improvements Capitalized Subsequent to Acquisition Costs					113,357
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,461
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					116,979
Total Carrying Value		126,440			126,440
Accumulated Depreciation		9,914			9,914
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		126,440
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		9,914
United Dominion Reality L.P. | Southeastern Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					45,330
Initial Costs, Buildings and Improvements					163,328
Total Initial Acquisition Costs					208,658
Costs of Improvements Capitalized Subsequent to Acquisition Costs					113,129
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					54,064
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					267,723
Total Carrying Value		321,787			321,787
Accumulated Depreciation		180,879			180,879
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		321,787
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		180,879
United Dominion Reality L.P. | Southeastern Region | Inlet Bay
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					7,702
Initial Costs, Buildings and Improvements					23,150
Total Initial Acquisition Costs					30,852
Costs of Improvements Capitalized Subsequent to Acquisition Costs					15,659
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					9,304
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					37,207
Total Carrying Value		46,511			46,511
Accumulated Depreciation		27,055			27,055
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		46,511
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		27,055
United Dominion Reality L.P. | Southeastern Region | MacAlpine Place
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,869
Initial Costs, Buildings and Improvements					36,858
Total Initial Acquisition Costs					47,727
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,862
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,545
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					44,044
Total Carrying Value		55,589			55,589
Accumulated Depreciation		28,780			28,780
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		55,589
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		28,780
United Dominion Reality L.P. | Southeastern Region | TAMPA, FL
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					18,571
Initial Costs, Buildings and Improvements					60,008
Total Initial Acquisition Costs					78,579
Costs of Improvements Capitalized Subsequent to Acquisition Costs					23,521
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					20,849
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					81,251
Total Carrying Value		102,100			102,100
Accumulated Depreciation		55,835			55,835
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		102,100
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		55,835
United Dominion Reality L.P. | Southeastern Region | Legacy Hill
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,148
Initial Costs, Buildings and Improvements					5,867
Total Initial Acquisition Costs					7,015
Costs of Improvements Capitalized Subsequent to Acquisition Costs					8,807
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,764
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					14,058
Total Carrying Value		15,822			15,822
Accumulated Depreciation		11,246			11,246
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		15,822
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		11,246
United Dominion Reality L.P. | Southeastern Region | Hickory Run
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					1,469
Initial Costs, Buildings and Improvements					11,584
Total Initial Acquisition Costs					13,053
Costs of Improvements Capitalized Subsequent to Acquisition Costs					10,459
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					2,155
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					21,357
Total Carrying Value		23,512			23,512
Accumulated Depreciation		14,244			14,244
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		23,512
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		14,244
United Dominion Reality L.P. | Southeastern Region | Carrington Hills
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					2,117
Initial Costs, Buildings and Improvements					0
Total Initial Acquisition Costs					2,117
Costs of Improvements Capitalized Subsequent to Acquisition Costs					34,535
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					4,506
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					32,146
Total Carrying Value		36,652			36,652
Accumulated Depreciation		21,305			21,305
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		36,652
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		21,305
United Dominion Reality L.P. | Southeastern Region | Brookridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					708
Initial Costs, Buildings and Improvements					5,461
Total Initial Acquisition Costs					6,169
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,830
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,162
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					9,837
Total Carrying Value		10,999			10,999
Accumulated Depreciation		7,007			7,007
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		10,999
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		7,007
United Dominion Reality L.P. | Southeastern Region | Breckenridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					766
Initial Costs, Buildings and Improvements					7,714
Total Initial Acquisition Costs					8,480
Costs of Improvements Capitalized Subsequent to Acquisition Costs					4,646
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					1,285
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					11,841
Total Carrying Value		13,126			13,126
Accumulated Depreciation		8,155			8,155
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		13,126
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		8,155
United Dominion Reality L.P. | Southeastern Region | Polo Park
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					4,583
Initial Costs, Buildings and Improvements					16,293
Total Initial Acquisition Costs					20,876
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,508
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					5,741
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					31,643
Total Carrying Value		37,384			37,384
Accumulated Depreciation		22,411			22,411
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		37,384
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		22,411
United Dominion Reality L.P. | Southeastern Region | NASHVILLE, TN
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,791
Initial Costs, Buildings and Improvements					46,919
Total Initial Acquisition Costs					57,710
Costs of Improvements Capitalized Subsequent to Acquisition Costs					79,785
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,613
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					120,882
Total Carrying Value		137,495			137,495
Accumulated Depreciation		84,368			84,368
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		137,495
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		84,368
United Dominion Reality L.P. | Southeastern Region | The Reserve and Park at Riverbridge
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					15,968
Initial Costs, Buildings and Improvements					56,401
Total Initial Acquisition Costs					72,369
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,823
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,602
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,590
Total Carrying Value		82,192			82,192
Accumulated Depreciation		40,676			40,676
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		82,192
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,676
United Dominion Reality L.P. | Southeastern Region | OTHER FLORIDA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					39,179
Initial Costs, Land and Land Improvements					15,968
Initial Costs, Buildings and Improvements					56,401
Total Initial Acquisition Costs					72,369
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,823
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					16,602
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					65,590
Total Carrying Value		82,192			82,192
Accumulated Depreciation		40,676			40,676
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		82,192
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		40,676
United Dominion Reality L.P. | Northeast Region
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					110,030
Initial Costs, Buildings and Improvements					536,413
Total Initial Acquisition Costs					646,443
Costs of Improvements Capitalized Subsequent to Acquisition Costs					23,199
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					110,383
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					559,259
Total Carrying Value		669,642			669,642
Accumulated Depreciation		142,858			142,858
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		669,642
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		142,858
United Dominion Reality L.P. | Northeast Region | 14 North
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,961
Initial Costs, Buildings and Improvements					51,175
Total Initial Acquisition Costs					62,136
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,359
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,077
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					57,418
Total Carrying Value		68,495			68,495
Accumulated Depreciation		16,632			16,632
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		68,495
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,632
United Dominion Reality L.P. | Northeast Region | BOSTON, MA
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					10,961
Initial Costs, Buildings and Improvements					51,175
Total Initial Acquisition Costs					62,136
Costs of Improvements Capitalized Subsequent to Acquisition Costs					6,359
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					11,077
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					57,418
Total Carrying Value		68,495			68,495
Accumulated Depreciation		16,632			16,632
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		68,495
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		16,632
United Dominion Reality L.P. | Northeast Region | 10 Hanover Square
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					41,432
Initial Costs, Buildings and Improvements					218,983
Total Initial Acquisition Costs					260,415
Costs of Improvements Capitalized Subsequent to Acquisition Costs					9,730
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					41,496
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					228,649
Total Carrying Value		270,145			270,145
Accumulated Depreciation		54,457			54,457
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		270,145
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		54,457
United Dominion Reality L.P. | Northeast Region | 95 Wall Street
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					57,637
Initial Costs, Buildings and Improvements					266,255
Total Initial Acquisition Costs					323,892
Costs of Improvements Capitalized Subsequent to Acquisition Costs					7,110
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					57,810
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					273,192
Total Carrying Value		331,002			331,002
Accumulated Depreciation		71,769			71,769
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		331,002
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		71,769
United Dominion Reality L.P. | Northeast Region | NEW YORK, NY
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					0
Initial Costs, Land and Land Improvements					99,069
Initial Costs, Buildings and Improvements					485,238
Total Initial Acquisition Costs					584,307
Costs of Improvements Capitalized Subsequent to Acquisition Costs					16,840
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					99,306
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					501,841
Total Carrying Value		601,147			601,147
Accumulated Depreciation		126,226			126,226
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		601,147
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		126,226
United Dominion Reality L.P. | Total Operating Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Encumbrances					478,163
Initial Costs, Land and Land Improvements					747,171
Initial Costs, Buildings and Improvements					2,082,113
Total Initial Acquisition Costs					2,829,284
Costs of Improvements Capitalized Subsequent to Acquisition Costs					805,694
Gross Amount at Which Carried at Close of Period, Land and Land Improvements					831,920
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements					2,790,464
Total Carrying Value		3,622,384			3,622,384
Accumulated Depreciation		1,278,575			1,278,575
Real Estate Owned, Gross [Roll Forward]
Balance at end of the year		3,622,384
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Balance at end of year		1,278,575
Corporate Joint Venture [Member]
Real Estate Owned, Gross [Roll Forward]
Real estate acquired		0	0	129,437
Retirement of fully depreciated assets		0	(112,344)	(356,303)
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Accumulated depreciation on retirements of fully depreciated asset		$ 0	$ (4,228)	$ (20,662)
UDR Lighthouse DownREIT L.P. [Member] | United Dominion Reality L.P.
Real Estate Owned, Gross [Roll Forward]
Real Estate Investment Property, at Cost					(628,479)	0	0
Real Estate Owned, Accumulated Depreciation [Roll Forward]
Real Estate Owned, Accumulated Depreciation					$ (223,363)	$ 0	$ 0
[1]	Includes unallocated accruals and capital expenditures.The aggregate cost for federal income tax purposes was approximately $8.3 billion at December 31, 2015. The estimated depreciable lives for all buildings in the latest Consolidated Statements of Operations are 35 to 55 years.
[2]	Includes unallocated accruals and capital expenditures.The aggregate cost for federal income tax purpose was approximately $3.0 billion at December 31, 2015.