UDR (UDR) 10-K 25 Feb 14 2013 Q4 Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2013	Feb. 18, 2014
Entity Information [Line Items]	'	'
Entity Registrant Name	'UDR, Inc.	'
Entity Central Index Key	'0000074208	'
Document Type	'10-K	'
Document Period End Date	31-Dec-13	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q4	'
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	$3.30	'
Entity Common Stock, Shares Outstanding	'	251,434,518
United Dominion Reality L.P.	'	'
Entity Information [Line Items]	'	'
Entity Registrant Name	'United Dominion Realty L.P.	'
Entity Central Index Key	'0001018254	'
Document Type	'10-K	'
Document Period End Date	31-Dec-13	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q4	'
Current Fiscal Year End Date	'--12-31	'
Entity Well-known Seasoned Issuer	'No	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Public Float	'	'
Entity Common Stock, Shares Outstanding	'	0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
Real estate owned:	'	'
Real estate held for investment	$7,723,844,000	$7,475,771,000
Less: accumulated depreciation	-2,200,815,000	-1,884,039,000
Real estate held for investment, net	5,523,029,000	5,591,732,000
Real estate under development (net of accumulated depreciation)	466,002,000	489,795,000
Real estate sold or held for sale (net of accumulated depreciation)	10,152,000	49,619,000
Total real estate owned, net of accumulated depreciation	5,999,183,000	6,131,146,000
Cash and cash equivalents	30,249,000	12,115,000
Restricted cash	22,796,000	23,561,000
Deferred financing costs, net	26,924,000	24,990,000
Notes receivable, net	83,033,000	64,006,000
Investment in unconsolidated joint ventures	507,655,000	477,631,000
Other assets	137,882,000	125,654,000
Total assets	6,807,722,000	6,859,103,000
Liabilities:	'	'
Secured debt	1,442,077,000	1,430,135,000
Unsecured debt	2,081,626,000	1,979,198,000
Real estate taxes payable	13,847,000	14,076,000
Accrued interest payable	32,279,000	30,937,000
Security deposits and prepaid rent	27,203,000	25,025,000
Distributions payable	61,907,000	57,915,000
Deferred fees and gains on the sale of depreciable property	25,443,000	29,406,000
Accounts payable, accrued expenses, and other liabilities	118,682,000	104,567,000
Total liabilities	3,777,621,000	3,641,853,000
Redeemable non-controlling interests in operating partnership	217,597,000	223,418,000
Equity	'	'
Common stock, $0.01 par value; 350,000,000 shares authorized 250,136,597 shares issued and outstanding (219,650,225 shares at December 31, 2011)	2,507,000	2,501,000
Additional paid-in capital	4,109,765,000	4,098,882,000
Distributions in excess of net income	1,342,070,000	1,143,781,000
Accumulated other comprehensive income/(loss), net	-5,125,000	-11,257,000
Total stockholders' equity	2,811,648,000	2,992,916,000
Non-controlling interest	856,000	916,000
Total equity	2,812,504,000	2,993,832,000
Total liabilities and equity	6,807,722,000	6,859,103,000
8.00% Series E Cumulative Convertible Preferred Stock	'	'
Equity	'	'
Preferred stock, no par value; 50,000,000 shares authorized	$46,571,000	$46,571,000

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Real estate owned:	'	'
Real estate under development, accumulated depreciation	1,411	1,253
Real estate held for sale, accumulated depreciation	6,568	39,390
Preferred stock, par or state value per share	0	0
Equity	'	'
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 issued	250,749,665	250,139,408
Common stock, shares outstanding	250,749,665	250,139,408
8.00% Series E Cumulative Convertible Preferred Stock	'	'
Equity	'	'
Preferred stock, shares issued	2,803,812	2,803,812
Preferred stock, shares outstanding	2,803,812	2,803,812
6.75% Series G Cumulative Redeemable Preferred Stock	'	'
Equity	'	'
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (Unaudited) (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leases, Income Statement, Lease Revenue	$746,484,000	$704,701,000	$613,689,000
REVENUES	'	'	'
Other Real Estate Revenue	12,442,000	11,911,000	9,668,000
Management Fees Revenue	11,200,000	11,800,000	9,600,000
Non-property income:	'	'	'
Total revenues	758,926,000	716,612,000	623,357,000
Rental expenses:	'	'	'
Direct Costs of Leased and Rented Property or Equipment	144,319,000	139,784,000	127,091,000
Real estate taxes and insurance	93,765,000	86,154,000	75,007,000
Property management	20,528,000	19,378,000	16,875,000
Other operating expenses	7,136,000	5,718,000	6,118,000
Depreciation, Depletion and Amortization	348,231,000	354,505,000	374,274,000
Real estate depreciation and amortization	339,532,000	341,926,000	324,630,000
Hurricane-related charges, net	'	'	0
General and administrative	42,238,000	43,792,000	47,257,000
Insurance Recoveries	-12,253,000	8,495,000	0
Other depreciation and amortization	6,741,000	4,105,000	3,931,000
Total expenses	642,006,000	649,352,000	600,909,000
Loss from operations	116,920,000	67,260,000	22,448,000
Interest and Other Income	4,619,000	3,524,000	7,754,000
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	-4,959,000	-76,587,000	-132,516,000
Loss from unconsolidated entities	-415,000	-8,579,000	-6,352,000
Interest Expense	-126,083,000	-138,792,000	-156,366,000
Tax benefit/(expense) of taxable REIT subsidiary	8,281,000	21,076,000	-7,571,000
(Loss)/income from continuing operations	2,340,000	-46,305,000	-126,869,000
Income/(loss) from discontinued operations, net of tax	43,942,000	266,608,000	147,454,000
Net income/(loss)	46,282,000	220,303,000	20,585,000
Net (income)/loss attributable to redeemable non-controlling interests in OP	-1,530,000	-7,986,000	-395,000
Net income attributable to non-controlling interests	-60,000	140,000	167,000
Net (loss)/income attributable to Entity	44,812,000	212,177,000	20,023,000
Premium on preferred stock redemption or repurchases, net	0	-2,791,000	-175,000
Net (loss)/income attributable to common stockholders	41,088,000	203,376,000	10,537,000
Earnings per weighted average common share - basic and diluted:	'	'	'
Loss from continuing operations attributable to common stockholders	($0.01)	($0.22)	($0.65)
Income from discontinued operations	$0.17	$1.07	$0.71
Net (loss)/income attributable to common stockholders	$0.16	$0.85	$0.05
Weighted average number of common shares outstanding b basic and diluted	249,969	238,851	201,294
8.00% Series E Cumulative Convertible Preferred Stock	'	'	'
Rental expenses:	'	'	'
Distributions to preferred stockholders	-3,724,000	-3,724,000	-3,724,000
6.75% Series G Cumulative Redeemable Preferred Stock	'	'	'
Rental expenses:	'	'	'
Distributions to preferred stockholders	0	-2,286,000	-5,587,000
Continuing Operations [Member]	'	'	'
Rental expenses:	'	'	'
Tax benefit/(expense) of taxable REIT subsidiary	$7,299,000	$30,282,000	$5,647,000

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income / (Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
Net income/(loss)	$46,282	$220,303	$20,585
Other comprehensive income/(loss) - derivative instruments:	'	'	'
Unrealized holding loss	-469	-4,924	-16,477
Loss reclassified into earnings from other comprehensive income	6,851	7,649	9,132
Other comprehensive income - marketable securities:	'	'	'
Gain reclassified into earnings from other comprehensive income	0	0	-3,492
Other comprehensive income/(loss)	6,382	2,725	-10,837
Comprehensive (loss)/income	52,664	223,028	9,748
Comprehensive (loss)/income attributable to non-controlling interests	1,720	8,206	158
Comprehensive (loss)/income attributable to Entity	$50,944	$214,822	$9,590

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Equity (USD $)	Total	Preferred Stock	Common Stock	Paid - in Capital	Distributions in Excess of Net Income	Accumulated Other Comprehensive Income/(Loss)	Noncontrolling Interest
Beginning Balance at Dec. 31, 2010	$1,610,030,000	$131,710,000	$1,825,000	$2,450,141,000	($973,864,000)	($3,469,000)	$3,687,000
Beginning Balance, Shares at Dec. 31, 2010	'	6,029,374	182,496,330	'	'	'	'
Consolidated Statements of Changes in Equity	'	'	'	'	'	'	'
Net income	20,023,000	'	'	'	20,023,000	'	'
Net income attributable to non-controlling interests	167,000	'	'	'	'	'	167,000
Other comprehensive (loss)/income	-10,433,000	'	'	'	'	-10,433,000	'
Issuance/(forfeiture) of common and restricted shares, net, Shares	'	'	615,752	'	'	'	'
Issuance/(forfeiture) of common and restricted shares, net	11,002,000	'	6,000	10,996,000	'	'	'
Issuance of common shares through public offering, Shares	'	'	36,525,632	'	'	'	'
Issuance of common shares through public offering	879,754,000	'	366,000	879,388,000	'	'	'
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares	'	-141,200	'	'	'	'	'
Redemption of 6.75% Series G Cumulative Redeemable Shares	-3,597,000	-3,530,000	'	108,000	-175,000	'	'
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	'	'	12,511	'	'	'	'
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	287,000	'	0	287,000	'	'	'
Acquisition of non-controlling interest	-450,000	'	'	'	0	'	'
Increase in non-controlling interest from business combination, net	880,000	'	'	'	'	'	880,000
Common stock distributions declared	-165,590,000	'	'	'	-165,590,000	'	'
Preferred stock distributions declared-Series E	-3,724,000	'	'	'	-3,724,000	'	'
Preferred stock distributions declared-Series G	-5,587,000	'	'	'	-5,587,000	'	'
Adjustment to reflect redemption value of redeemable non-controlling interests	-13,978,000	'	'	'	-13,978,000	'	'
Ending Balance at Dec. 31, 2011	2,318,784,000	128,180,000	2,197,000	3,340,470,000	-1,142,895,000	-13,902,000	4,734,000
Ending Balance, Shares at Dec. 31, 2011	'	6,068,174	219,650,225	'	'	'	'
Consolidated Statements of Changes in Equity	'	'	'	'	'	'	'
Net income	212,177,000	'	'	'	212,177,000	'	'
Net income attributable to non-controlling interests	140,000	'	'	'	'	'	140,000
Other comprehensive (loss)/income	2,645,000	'	'	'	'	2,645,000	'
Issuance/(forfeiture) of common and restricted shares, net, Shares	'	'	-22,224	'	'	'	'
Issuance/(forfeiture) of common and restricted shares, net	-742,000	'	0	-742,000	'	'	'
Issuance of common shares through public offering, Shares	'	'	30,490,969	'	'	'	'
Issuance of common shares through public offering	756,138,000	'	305,000	755,833,000	'	'	'
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares	'	-3,264,362	'	'	'	'	'
Redemption of 6.75% Series G Cumulative Redeemable Shares	-81,609,000	-81,609,000	'	2,791,000	-2,791,000	'	'
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	'	'	20,438	'	'	'	'
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	529,000	'	-1,000	530,000	'	'	'
Acquisition of non-controlling interest	-4,871,000	'	0	0	0	0	-4,871,000
Increase in non-controlling interest from business combination, net	913,000	'	'	'	'	'	913,000
Common stock distributions declared	-215,654,000	'	'	'	-215,654,000	0	'
Preferred stock distributions declared-Series E	-3,724,000	'	'	'	-3,724,000	0	'
Preferred stock distributions declared-Series G	-2,286,000	'	'	'	-2,286,000	0	'
Adjustment to reflect redemption value of redeemable non-controlling interests	11,392,000	'	'	'	11,392,000	0	'
Ending Balance at Dec. 31, 2012	2,993,832,000	46,571,000	2,501,000	4,098,882,000	-1,143,781,000	-11,257,000	916,000
Ending Balance, Shares at Dec. 31, 2012	'	2,803,812	250,139,408	'	'	'	'
Consolidated Statements of Changes in Equity	'	'	'	'	'	'	'
Net income	44,812,000	'	'	'	44,812,000	'	'
Net income attributable to non-controlling interests	-60,000	'	'	'	'	'	-60,000
Other comprehensive (loss)/income	6,132,000	'	'	'	'	6,132,000	'
Issuance/(forfeiture) of common and restricted shares, net, Shares	'	'	533,966	'	'	'	'
Issuance/(forfeiture) of common and restricted shares, net	9,072,000	'	5,000	9,067,000	'	'	'
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares	'	0	'	'	'	'	'
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares	76,291	'	76,291	'	'	'	'
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	1,817,000	'	1,000	1,816,000	'	'	'
Common stock distributions declared	-235,721,000	'	'	'	-235,721,000	'	'
Preferred stock distributions declared-Series E	-3,724,000	'	'	'	-3,724,000	'	'
Adjustment to reflect redemption value of redeemable non-controlling interests	-3,656,000	'	'	'	-3,656,000	'	'
Ending Balance at Dec. 31, 2013	$2,812,504,000	$46,571,000	$2,507,000	$4,109,765,000	($1,342,070,000)	($5,125,000)	$856,000
Ending Balance, Shares at Dec. 31, 2013	'	2,803,812	250,749,665	'	'	'	'

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common distributions declared per share	$0.94	$0.88	$0.80
Preferred Stock	'	'	'
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares	0	3,264,362	141,200
6.75% Series G Cumulative Redeemable Preferred Stock	'	'	'
Preferred stock distributions declared	$0	$0.57	$1.69
Redemption of 6.75% Series G Cumulative Redeemable Shares, Shares	3,264,362	141,200	'
8.00% Series E Cumulative Convertible Preferred Stock	'	'	'
Preferred stock distributions declared	$1.33	$1.33	$1.33

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Hurricane-related recovery noncash income	($270)	$8,495	'
Real estate disposed in asset exchange	0	0	192,576
Operating Activities	'	'	'
Net income/(loss)	46,282	220,303	20,585
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:	'	'	'
Depreciation and amortization	348,231	354,505	374,274
Net gain on the sale of depreciable property	-41,919	-251,554	-125,928
Loss from unconsolidated entities	415	8,579	6,352
Hurricane-related charges, net	'	'	0
Other Operating Activities, Cash Flow Statement	24,826	26,009	22,457
Income Tax Expense (Benefit)	-8,281	-21,076	7,571
Changes in operating assets and liabilities:	'	'	'
Increase/(decrease) in operating assets	-15,135	12,647	-38,282
Decrease in operating liabilities	-16,699	-21,515	-2,400
Net cash provided by operating activities	339,902	327,187	251,411
Payments to Acquire Real Estate	0	108,215	989,029
Investing Activities	'	'	'
Proceeds from sales of real estate investments, net	250,043	593,167	321,803
Proceeds from sale of marketable securities	0	0	9,799
Cash paid in nonmonetary asset exchange.	0	0	-28,124
Development of real estate assets	-372,744	-246,923	-98,683
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	-61,535	-144,877	-91,476
Capital expenditures - non-real estate assets	-7,639	-7,947	-13,267
Investment in unconsolidated joint ventures	-43,291	-283,369	-104,311
Distributions received from unconsolidated joint venture	130,984	50,580	11,202
Proceeds from Sale and Collection of Notes Receivable	19,027	63,998	7,800
Purchase deposits on pending real estate acquisitions	0	0	-80,397
Net cash provided by/(used in) investing activities	-123,209	-211,582	-1,054,683
Financing Activities	'	'	'
Payments on secured debt	-46,564	-491,885	-332,546
Proceeds from the issuance of secured debt	'	250	30,728
Proceeds from the issuance of unsecured debt	299,943	396,400	296,964
Payments on unsecured debt	-122,500	-100,000	-264,829
Net (repayment)/borrowings of revolving bank debt	-76,000	-345,000	389,250
Proceeds from the issuance of common shares through public offering, net	0	756,138	879,754
Payments from the repurchase of Series G preferred stock, net	0	-81,609	-3,597
Distributions paid to non-controlling interests	-9,348	-9,033	-10,947
Proceeds from (Payments to) Noncontrolling Interests	0	4,871	0
Distributions paid to preferred stockholders	-3,724	-6,954	-9,311
Distributions paid to common stockholders	-231,822	-207,470	-150,446
Proceeds from (Payments for) Other Financing Activities	-8,544	-21,959	-18,731
Net cash (used in)/provided by financing activities	-198,559	-115,993	806,289
Net increase in cash and cash equivalents	18,134	-388	3,017
Cash and cash equivalents, beginning of period	12,115	12,503	'
Cash and cash equivalents, end of period	30,249	12,115	12,503
Supplemental Information:	'	'	'
Interest paid during the period, net of amounts capitalized	127,877	133,133	155,598
Non-cash transactions:	'	'	'
Secured debt assumed in the acquisitions of properties, including asset exchange	63,595	34,412	278,657
Development costs and capital expenditures incurred but not yet paid	37,220	24,551	2,009
Contribution of purchase deposit made in 2011 to unconsolidated joint venture	0	80,397	0
Conversion of operating partnership non-controlling interests to common stock (18,440 shares in 2012 and 4,453 shares in 2011)	1,817	529	287
Real estate acquired in asset exchange	129,437	0	268,853
OP Units issued in partial consideration for property acquisition	0	0	111,034
Secured debt transferred in asset exchange	0	0	55,356
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	0	2,617	26,880
Impairment of Long-Lived Assets to be Disposed of, net of tax	1,470	0	0
Unconsolidated Joint Venture Vitruvian Park [Member]	'	'	'
Real estate disposed in asset exchange	175,951	0	0
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:	'	'	'
Loss from unconsolidated entities	2,851	0	0
Continuing Operations [Member]	'	'	'
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:	'	'	'
Income Tax Expense (Benefit)	($7,299)	($30,282)	($5,647)

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Non-cash transactions:	'	'	'
Number of shares of common stock converted from operating partnership non-controlling interests	76,291	20,438	12,511

Consolidated_Balance_Sheets_UN

Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Real estate owned:	'	'
Real estate held for investment	$7,723,844	$7,475,771
Less: accumulated depreciation	-2,200,815	-1,884,039
Real estate held for investment, net	5,523,029	5,591,732
Real estate under development (net of accumulated depreciation)	466,002	489,795
Real estate sold or held for sale (net of accumulated depreciation)	10,152	49,619
Total real estate owned, net of accumulated depreciation	5,999,183	6,131,146
Cash and cash equivalents	30,249	12,115
Restricted cash	22,796	23,561
Deferred financing costs, net	26,924	24,990
Other assets	137,882	125,654
Total assets	6,807,722	6,859,103
LIABILITIES AND CAPITAL	'	'
Secured debt	1,442,077	1,430,135
Real estate taxes payable	13,847	14,076
Accrued interest payable	32,279	30,937
Security deposits and prepaid rent	27,203	25,025
Distributions payable	61,907	57,915
Deferred fees and gains on the sale of depreciable property	25,443	29,406
Accounts payable, accrued expenses, and other liabilities	118,682	104,567
Total liabilities	3,777,621	3,641,853
Partners' Capital:	'	'
Accumulated other comprehensive loss	-5,125	-11,257
Total liabilities and equity	6,807,722	6,859,103
United Dominion Reality L.P.	'	'
Real estate owned:	'	'
Real estate held for investment	4,108,417	4,025,592
Less: accumulated depreciation	-1,241,574	-1,063,156
Real estate held for investment, net	2,866,843	2,962,436
Real estate under development (net of accumulated depreciation)	80,063	86,260
Real estate sold or held for sale (net of accumulated depreciation)	0	37,091
Total real estate owned, net of accumulated depreciation	2,946,906	3,085,787
Cash and cash equivalents	1,897	2,804
Restricted cash	13,526	12,926
Deferred financing costs, net	5,848	6,072
Other assets	25,064	28,665
Total assets	2,993,241	3,136,254
LIABILITIES AND CAPITAL	'	'
Secured debt	934,865	967,239
Notes payable due to General Partner	88,696	88,696
Real estate taxes payable	6,228	5,783
Accrued interest payable	3,323	3,604
Security deposits and prepaid rent	14,172	13,360
Distributions payable	43,253	40,752
Deferred fees and gains on the sale of depreciable property	63,838	63,838
Accounts payable, accrued expenses, and other liabilities	35,769	34,226
Total liabilities	1,190,144	1,217,498
Partners' Capital:	'	'
General partner: 110,883 OP units outstanding at December 31, 2012 and 2011	1,163	1,223
Limited partners: 184,170,370 OP units outstanding at December 31, 2012 and 2011	1,797,836	1,921,445
Accumulated other comprehensive loss	-3,065	-5,369
Total partners' capital	1,795,934	1,917,299
Receivable due from General Partner	-9,916	-11,056
Non-controlling interest	17,079	12,513
Total capital	1,803,097	1,918,756
Total liabilities and equity	$2,993,241	$3,136,254

Consolidated_Balance_Sheets_UN1

Consolidated Balance Sheets (UNITED DOMINION REALTY, L.P) (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Real estate under development, accumulated depreciation	$1,411	$1,253
Real estate owned:	'	'
Real estate held for sale, accumulated depreciation	6,568	39,390
Partners' Capital:	'	'
OP units outstanding related to general partner	173,959,774	174,886,035
OP units outstanding related to limited partner	183,278,698	184,281,254
United Dominion Reality L.P.	'	'
Real estate under development, accumulated depreciation	0	1,132
Real estate owned:	'	'
Real estate held for sale, accumulated depreciation	$0	$32,845
Partners' Capital:	'	'
OP units outstanding related to operating partnership	183,278,698	184,281,253
OP units outstanding related to general partner	110,883	110,883
OP units outstanding related to limited partner	183,167,815	184,170,370

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations (UNITED DOMINION REALTY, L.P) (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUES	'	'	'
Direct Costs of Leased and Rented Property or Equipment	$144,319,000	$139,784,000	$127,091,000
Rental expenses:	'	'	'
Real estate taxes and insurance	93,765,000	86,154,000	75,007,000
Property management	20,528,000	19,378,000	16,875,000
Other operating expenses	7,136,000	5,718,000	6,118,000
Real estate depreciation and amortization	339,532,000	341,926,000	324,630,000
Interest expense:	'	'	'
Hurricane-related charges, net	'	'	0
General and administrative	42,238,000	43,792,000	47,257,000
Insurance Recoveries	12,253,000	-8,495,000	0
Total expenses	642,006,000	649,352,000	600,909,000
Operating Income (Loss)	116,920,000	67,260,000	22,448,000
(Loss)/income from continuing operations	2,340,000	-46,305,000	-126,869,000
Loss/(income) from discontinued operations	43,942,000	266,608,000	147,454,000
Net income/(loss)	46,282,000	220,303,000	20,585,000
Net income attributable to non-controlling interests	-1,720,000	-8,206,000	-158,000
Net (loss)/income attributable to Entity	44,812,000	212,177,000	20,023,000
United Dominion Reality L.P.	'	'	'
REVENUES	'	'	'
Rental income	401,853,000	384,946,000	344,937,000
Direct Costs of Leased and Rented Property or Equipment	75,019,000	72,843,000	67,895,000
Rental expenses:	'	'	'
Real estate taxes and insurance	45,139,000	40,866,000	39,170,000
Property management	11,051,000	10,587,000	9,484,000
Other operating expenses	5,728,000	5,272,000	5,484,000
Real estate depreciation and amortization	179,367,000	191,731,000	184,461,000
Interest expense:	'	'	'
Interest on secured debt	34,989,000	43,277,000	51,827,000
Interest on note payable due to General Partner	1,069,000	1,957,000	990,000
General and administrative	24,808,000	26,204,000	26,370,000
Insurance Recoveries	-8,083,000	5,518,000	0
Total expenses	333,029,000	353,021,000	332,864,000
Operating Income (Loss)	68,824,000	31,925,000	12,073,000
(Loss)/income from continuing operations	32,766,000	-13,309,000	-40,744,000
Loss/(income) from discontinued operations	45,176,000	57,643,000	70,973,000
Net income/(loss)	77,942,000	44,334,000	30,229,000
Net income attributable to non-controlling interests	-4,566,000	-352,000	-70,000
Net (loss)/income attributable to Entity	$73,376,000	$43,982,000	$30,159,000
Loss per OP unit- basic and diluted:	'	'	'
Loss from continuing operations attributable to OP unitholders (in dollars per share)	$0.16	($0.07)	($0.22)
Income from discontinued operations (in dollars per share)	$0.24	$0.31	$0.39
Net income/(loss) attributable to OP unitholders (in dollars per share)	$0.40	$0.24	$0.17
Weighted average OP units outstanding (in shares)	184,196	184,281	182,448

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income / (Loss) (UNITED DOMINION REALTY, L.P.) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income/(loss)	$46,282	$220,303	$20,585
Other comprehensive income/(loss):	'	'	'
Unrealized holding loss	-469	-4,924	-16,477
Loss reclassified into earnings from other comprehensive income	6,851	7,649	9,132
Other comprehensive income/(loss)	6,382	2,725	-10,837
Comprehensive (loss)/income	52,664	223,028	9,748
Comprehensive (loss)/income attributable to non-controlling interests	1,720	8,206	158
Comprehensive (loss)/income attributable to Entity	50,944	214,822	9,590
United Dominion Reality L.P.	'	'	'
Net income/(loss)	77,942	44,334	30,229
Other comprehensive income/(loss):	'	'	'
Unrealized holding loss	-348	-1,898	-6,119
Loss reclassified into earnings from other comprehensive income	2,652	3,431	4,719
Other comprehensive income/(loss)	2,304	1,533	-1,400
Comprehensive (loss)/income	80,246	45,867	28,829
Comprehensive (loss)/income attributable to non-controlling interests	4,566	352	70
Comprehensive (loss)/income attributable to Entity	$75,680	$45,515	$28,759

Consolidated_Statements_of_Cha2

Consolidated Statements of Changes in Capital (UNITED DOMINION REALTY, L.P) (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
OP Units issued for real estate	$0	$0	$111,034,000	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	4,871,000	450,000	'
Other comprehensive income (loss)	6,382,000	2,725,000	-10,837,000	'
United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	1,918,756,000	1,853,369,000	'	1,561,623,000
Distributions	-173,716,000	-163,008,000	-147,242,000	'
Noncash Or Part Noncash Distribution, Issued Value	-77,041,000	0	0	'
OP Units issued for cash	'	0	'	'
OP Units issued for real estate	-77,041,000	'	111,034,000	'
Adjustment to reflect limited partners' capital at redemption value	0	'	'	'
Net income (loss)	77,942,000	44,334,000	30,229,000	'
Other comprehensive income (loss)	2,304,000	1,533,000	-1,400,000	'
Net change in receivable due from General Partner	54,852,000	182,528,000	299,125,000	'
Balance	1,803,097,000	1,918,756,000	1,853,369,000	1,561,623,000
United Dominion Reality L.P. | Accumulated Other Comprehensive Income/(Loss)	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	-5,369,000	-6,902,000	'	-5,502,000
Other comprehensive income (loss)	2,304,000	1,533,000	-1,400,000	'
Balance	-3,065,000	-5,369,000	-6,902,000	-5,502,000
United Dominion Reality L.P. | Total Partner's Capital	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	1,917,299,000	2,034,792,000	'	2,042,241,000
Distributions	-173,716,000	-163,008,000	-147,242,000	'
Noncash Or Part Noncash Distribution, Issued Value	-23,329,000	'	'	'
OP Units issued for cash	'	0	'	'
OP Units issued for real estate	-23,329,000	'	111,034,000	'
Adjustment to reflect limited partners' capital at redemption value	0	'	'	'
Net income (loss)	73,376,000	43,982,000	30,159,000	'
Other comprehensive income (loss)	2,304,000	1,533,000	-1,400,000	'
Balance	1,795,934,000	1,917,299,000	2,034,792,000	2,042,241,000
United Dominion Reality L.P. | Receivable Due From General Partner	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	-11,056,000	-193,584,000	'	-492,709,000
Net change in receivable due from General Partner	54,852,000	182,528,000	299,125,000	'
Balance	-9,916,000	-11,056,000	-193,584,000	-492,709,000
United Dominion Reality L.P. | Noncontrolling Interest	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	12,513,000	12,161,000	'	12,091,000
Net income (loss)	4,566,000	352,000	70,000	'
Balance	17,079,000	12,513,000	12,161,000	12,091,000
United Dominion Reality L.P. | Class A Limited Partner	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	41,656,000	43,967,000	'	41,199,000
Distributions	-2,324,000	-2,328,000	-2,328,000	'
Adjustment to reflect limited partners' capital at redemption value	702,000	-596,000	4,809,000	'
Net income (loss)	868,000	613,000	287,000	'
Balance	40,902,000	41,656,000	43,967,000	41,199,000
United Dominion Reality L.P. | Limited Partners	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	181,762,000	192,508,000	'	77,858,000
Distributions	-7,118,000	-6,738,000	-4,973,000	'
OP Unit Redemptions for common shares of UDR	-1,817,000	-529,000	-287,000	'
OP Units issued for cash	'	-133,000	'	'
OP Units issued for real estate	'	'	111,034,000	'
Adjustment to reflect limited partners' capital at redemption value	852,000	-5,166,000	7,621,000	'
Net income (loss)	3,016,000	1,820,000	1,255,000	'
Balance	176,695,000	181,762,000	192,508,000	77,858,000
United Dominion Reality L.P. | Limited Partner	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	1,698,027,000	1,803,926,000	'	1,927,323,000
Distributions	-164,170,000	-153,846,000	-139,853,000	'
OP Unit Redemptions for common shares of UDR	1,817,000	529,000	287,000	'
OP Units issued for cash	'	133,000	'	'
OP Units issued for real estate	'	'	0	'
Adjustment to reflect limited partners' capital at redemption value	-1,554,000	5,762,000	-12,430,000	'
Net income (loss)	69,448,000	41,523,000	28,599,000	'
Balance	1,580,239,000	1,698,027,000	1,803,926,000	1,927,323,000
United Dominion Reality L.P. | General Partner	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Balance	1,223,000	1,293,000	'	1,363,000
Distributions	-104,000	-96,000	-88,000	'
Net income (loss)	44,000	26,000	18,000	'
Balance	1,163,000	1,223,000	1,293,000	1,363,000
Noncontrolling Interest	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	4,871,000	'	'
Noncontrolling Interest | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	0	'	'	'
Receivable Due From General Partner [Member] | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	-53,712,000	'	'	'
OP Units issued for real estate	-53,712,000	'	'	'
Accumulated Other Comprehensive Income/(Loss)	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	'	0	'	'
Accumulated Other Comprehensive Income/(Loss) | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	0	'	'	'
General Partner | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	0	'	'	'
Limited Partner | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	-23,329,000	'	'	'
Limited Partners [Member] | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	0	'	'	'
Class A Limited Partner | United Dominion Reality L.P.	'	'	'	'
Increase (Decrease) in Partners' Capital [Roll Forward]	'	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	$0	'	'	'

Consolidated_Statements_of_Cas2

Consolidated Statements of Cash Flows (UNITED DOMINION REALTY, L.P) (Unaudited) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities	'	'	'
Net income/(loss)	$46,282	$220,303	$20,585
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:	'	'	'
Depreciation and amortization	348,231	354,505	374,274
Net gain on the sale of depreciable property	-41,919	-251,554	-125,928
Hurricane-related recovery noncash income	-270	8,495	'
Other Operating Activities, Cash Flow Statement	24,826	26,009	22,457
Changes in operating assets and liabilities:	'	'	'
Increase/(decrease) in operating assets	-15,135	12,647	-38,282
Increase in operating liabilities	-16,699	-21,515	-2,400
Net cash provided by operating activities	339,902	327,187	251,411
Investing Activities	'	'	'
Development of real estate assets	-372,744	-246,923	-98,683
Proceeds from sales of real estate investments, net	250,043	593,167	321,803
Capital expenditures and other major improvements b real estate assets, net of escrow reimbursement	0	0	-80,397
Cash paid in nonmonetary asset exchange	0	0	-28,124
Net cash provided by/(used in) investing activities	-123,209	-211,582	-1,054,683
Financing Activities	'	'	'
Proceeds from the issuance of secured debt	'	250	30,728
Payments on secured debt	-46,564	-491,885	-332,546
Net cash (used in)/provided by financing activities	-198,559	-115,993	806,289
Net increase in cash and cash equivalents	18,134	-388	3,017
Cash and cash equivalents, beginning of period	12,115	12,503	'
Cash and cash equivalents, end of period	30,249	12,115	12,503
Supplemental Information:	'	'	'
Interest paid during the period, net of amounts capitalized	127,877	133,133	155,598
Properties acquired, including intangibles in asset exchange	129,437	0	268,853
Properties disposed in asset exchange, net of accumulated depreciation	0	0	192,576
OP Units issued in partial consideration for property acquisition	0	0	-111,034
Secured debt assumed in the acquisitions of properties, including asset exchange	63,595	34,412	278,657
Secured debt transferred in asset exchange	0	0	55,356
Reallocation of Credit Facilities Debt from General Partner	13,682	0	0
United Dominion Reality L.P.	'	'	'
Operating Activities	'	'	'
Net income/(loss)	77,942	44,334	30,229
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:	'	'	'
Depreciation and amortization	181,302	195,051	197,964
Net gain on the sale of depreciable property	-41,518	-51,094	-60,065
Hurricane-related recovery noncash income	-270	5,518	0
Other Operating Activities, Cash Flow Statement	2,097	3,624	4,465
Changes in operating assets and liabilities:	'	'	'
Increase/(decrease) in operating assets	-11,685	-1,543	-11,516
Increase in operating liabilities	478	5,205	-5,006
Net cash provided by operating activities	208,346	201,095	156,071
Investing Activities	'	'	'
Development of real estate assets	-66,407	-36,804	0
Proceeds from sales of real estate investments, net	79,437	113,175	138,693
Capital expenditures and other major improvements b real estate assets, net of escrow reimbursement	-76,984	-72,098	-63,191
Acquisition of real estate assets (net of liabilities assumed) and initial capital expenditures	0	0	-287,075
Cash paid in nonmonetary asset exchange	0	0	-15,407
Net cash provided by/(used in) investing activities	-63,954	4,273	-226,980
Financing Activities	'	'	'
Advances from General Partner, net	-92,537	29,391	175,964
Proceeds from the issuance of secured debt	0	26,054	2,074
Payments on secured debt	-42,237	-249,680	-96,902
Distributions paid to partnership unitholders	-9,348	-9,033	-7,300
Payment of financing costs	-1,177	0	-3,143
Net cash (used in)/provided by financing activities	-145,299	-203,268	70,693
Net increase in cash and cash equivalents	-907	2,100	-216
Cash and cash equivalents, beginning of period	2,804	704	'
Cash and cash equivalents, end of period	1,897	2,804	704
Supplemental Information:	'	'	'
Interest paid during the period, net of amounts capitalized	42,506	48,545	56,871
Properties acquired, including intangibles in asset exchange	0	0	178,353
Properties disposed in asset exchange, net of accumulated depreciation	0	0	139,725
Noncash Or Part Noncash Distribution, Issued Value	-77,041	0	0
OP Units issued in partial consideration for property acquisition	77,041	'	-111,034
Secured debt assumed in the acquisitions of properties, including asset exchange	0	0	247,805
Capital Expenditures Incurred but Not yet Paid	6,371	7,440	721
Secured debt transferred in asset exchange	0	0	55,356
Fair market value adjustment of secured debt assumed in acquisitions of properties, including asset exchange	0	0	21,915
UDR Pacific Los Alisos, LP [Member] | United Dominion Reality L.P.	'	'	'
Supplemental Information:	'	'	'
Properties disposed in asset exchange, net of accumulated depreciation	74,586	0	0
Partnership Capital [Member] | United Dominion Reality L.P.	'	'	'
Supplemental Information:	'	'	'
Noncash Or Part Noncash Distribution, Issued Value	-23,329	'	'
OP Units issued in partial consideration for property acquisition	$23,329	'	($111,034)

Consolidation_and_Basis_of_Pre

Consolidation and Basis of Presentation	12 Months Ended
	Dec. 31, 2013
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, 2013, our consolidated apartment portfolio consisted of 141 consolidated communities located in 21 markets consisting of 41,250 apartment homes. In addition, the Company has an ownership interest in 9,909 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”). As of December 31, 2013 and 2012, there were 183,278,698 and 184,281,253 units, respectively, in the Operating Partnership outstanding, of which 173,959,774 units or 94.9% and 174,886,035 or 94.9%, respectively, were owned by UDR and 9,318,924 units or 5.1% and 9,395,218 or 5.1%, respectively, were owned by limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating 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 3, Real Estate Owned, and Note 6, Secured and Unsecured Debt.

Significant_Accounting_Policie

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
SIGNIFICANT ACCOUNTING POLICIES	'
	SIGNIFICANT ACCOUNTING POLICIES
	Recent Accounting Pronouncements
	In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-10, Disclosures about Offsetting Assets and Liabilities. The objective of this update is to provide enhanced disclosures that will enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position. This included the effect or potential effect of rights of setoff associated with an entity’s recognized assets and recognized liabilities within the scope of this update. The amendments require enhanced disclosures by requiring improved information about financial instruments and derivative instruments that are either 1) offset on the balance sheet in accordance with the “Offsetting Guidance” in ASC 210-20-45 or ASC 815-10-45 (collectively, the offsetting guidance) or 2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether they are offset in accordance with the “Offsetting Guidance”. The amendments, which were adopted by the Company on January 1, 2013, impacted the Company’s disclosures related to its derivative activities. (See Note 13, Derivatives and Hedging Activity.) The new guidance did not have any impact on the Company’s consolidated financial position, results of operations, or cash flows.
	In February 2012, the FASB issued ASU No. 2013-02, Other Comprehensive Income (Topic 220) to require preparers to report, in one place, information about reclassifications out of accumulated other comprehensive income (“AOCI”). For significant items reclassified out of AOCI to net income in their entirety in the same reporting period, reporting (either on the face of the statement where net income is presented or in the notes thereto) is required about the effect of the reclassifications on the respective line items in the statement where net income is presented. For items that are not reclassified to net income in their entirety in the same reporting period, a cross reference to other existing disclosures is required in the notes. The amendments, which were adopted by the Company on January 1, 2013, did not have any impact on the Company's consolidated financial position, results of operations, or cash flows. The accompanying consolidated financial statements include the required disclosures in the Consolidated Statements of Comprehensive Income/(Loss) or in the notes thereto for each of the three years in the period ended December 31, 2013.
	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. As of December 31, 2013 and 2012, the amount of our net intangible assets, which are reflected in Other Assets in the Consolidated Balance Sheets, was $9.0 million and $11.9 million, respectively. As of December 31, 2013 and 2012, the amount of our net intangible liabilities, which are reflected in Accounts Payable, Accrued Expenses, and Other Liabilities in the Consolidated Balance Sheets, was $4.4 million and $5.2 million. The balances are being amortized over the remaining life of the respective intangible.
	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, 2013, 2012, and 2011 were $11.1 million, $10.0 million and $10.0 million, respectively. During the years ended December 31, 2013, 2012, and 2011, total interest capitalized was $29.4 million, $26.4 million, and $13.0 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, 2013 and 2012 (dollars in thousands):
		Interest rate at December 31, 2013		December 31, 2013		December 31, 2012
	Note due March 2014 (a)	3.67	%	$	40,800	$	—
	Note due October 2014 - related party (b)	—		—		24,481
	Note due February 2017 (c)	10	%	14,580		13,200
	Note due July 2017 (d)	8	%	1,400		100
	Note due June 2022 (net of discount of $247 and $275) (e)	7	%	26,253		26,225
	Total notes receivable, net			$	83,033	$	64,006
	(a) In conjunction with the sale of its 95% interest in the Lodge at Stoughton, one of its unconsolidated joint ventures, the Company provided the buyer with a $40.8 million three-month bridge loan at LIBOR plus a spread of 350 basis points with two three-month extension options at increased rates. For additional information on this transaction see Note 5, Joint Ventures and Partnerships.
	(b) As of December 31, 2012, the Company had a $24.5 million unsecured note receivable with one of its unconsolidated joint ventures. In December 2013, the outstanding balance was paid off in connection with the sale of the Company’s 95% interest in the joint venture. (See footnote (a) above and Note 5, Joint Ventures and Partnerships, for additional information on this transaction.)
	(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $14.6 million, which bears an interest rate of 10.00% per annum. During the year ended December 31, 2013, the Company loaned an additional $1.4 million under this note. 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).
	(d) 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. During the year ended December 31, 2013, the Company loaned an additional $1.3 million under the note. 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).
	(e) In 2012, the Company purchased mezzanine debt securing a mortgage on a class A community in West Los Angeles, California. The $26.5 million loan was purchased at a yield of 7.25% and bears a coupon rate of 7.00%. Interest payments are due monthly and the note is due June 2022. The discount is amortized using the effective interest method.
	During the years ended December 31, 2013, 2012 and 2011, the Company recognized $4.1 million, $2.7 million and $646,000 of interest income, net of accretion, from these notes receivable, of which $765,000, $281,000 and $0, respectively, were related party interest income. Interest income is included in Interest and Other Income/(Expense), Net on the Consolidated Statements of Operations.
	Marketable Securities
	During the year ended December 31, 2011, the Company sold marketable securities for $3.5 million, resulting in a realized gain of $3.1 million, which is included in Interest and Other Income/(Expense), Net on the Consolidated Statements of Operations. The cost of securities sold was based on the specific identification method. Unrealized gains of $3.5 million were reclassified out of accumulated other comprehensive income/(loss) into earnings during the year ended December 31, 2011. The marketable securities, which represented common stock in a publicly held company, were classified as “available-for-sale,” and were carried at fair value with unrealized gains and losses reported as a component of other comprehensive income/(loss).
	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 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, 2013, 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
	Interests in the Operating Partnership held by limited partners are represented by Operating Partnership units (“OP Units”). The income is allocated to holders of OP Units based upon net income available to common stockholders and the weighted average number of OP Units outstanding to total common shares plus OP 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 agreement.
	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 Amended and Restated Agreement of Limited Partnership of the Operating Partnership (the “Operating Partnership Agreement”), provided that such OP Units have been outstanding for at least one year. UDR, as the 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 the Company for each OP Unit), as defined in the Operating Partnership Agreement. 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”), primarily those engaged in development activities.
	Income taxes for our TRS, RE3, 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, 2013, UDR recorded a net income tax receivable of $1.3 million and a net deferred tax asset of $32.3 million (net of a valuation allowance of $1.3 million), which are classified in Other Assets on the Consolidated Balance Sheets.
	Prior to 2012, RE3 had a history of losses and, as a result, historically recognized a valuation allowance for net deferred tax assets.  Each quarter, the Company evaluates the need to retain all or a portion of the valuation allowance on its net deferred tax assets. In 2012, the Company determined that it was more likely than not that the deferred tax assets, including any remaining net operating loss carry forward, would be realized. In making this determination, the Company analyzed, among other things, its recent history of earnings from sales of depreciable property, forecasts of future earnings and its cumulative earnings for the last twelve quarters. The reversal of the valuation allowance resulted in an income tax benefit of $44.4 million during the year ended December 31, 2012, $21.5 million of which is reported in continuing operations and included within Tax Benefit, Net in the Consolidated Statements of Operations, and $22.9 million of which is included within Income/(Loss) from Discontinued Operations, Net of Tax in the Consolidated Statements of Operations.
	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 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 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, 2013. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2010 through 2012 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
	Under GAAP, the results of operations for those properties sold during the year or classified as held for sale at the end of the current year are 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 4, 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, 2013, 2012, and 2011, total advertising expense was $5.7 million, $6.2 million, and $5.4 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.
	Preferred Share Redemption and Repurchases
	During the year ended December 31, 2012, the Company completed the redemption of all outstanding shares of its 6.75% Series G Cumulative Redeemable Preferred Stock. A total of 3,264,362 shares of the Series G Preferred Stock was redeemed at a redemption price of $25 per share in cash, plus accrued and unpaid dividends to the redemption date for a total cost of $82.1 million.
When redeeming or repurchasing preferred stock, the Company recognizes share issuance costs as a charge to the preferred stock on a pro rata basis to the total costs incurred for the preferred stock as well as any premium or discount on the redemption or repurchase. In connection with the redemption of the Series G Preferred Stock, the Company recognized a (decrease)/increase in net income/(loss) attributable to common stockholders of $(2.8) million, and $(175,000) for the years ended December 31, 2012, and 2011, respectively, which is reported in Premium on Preferred Stock Redemption or Repurchases, Net on the Consolidated Statements of Operations.
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, 2013, 2012, and 2011, 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 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, 2013, 2012, and 2011 was $250,000, $80,000, and $(404,000), 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, 2013, 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, 2013
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, 2013, the Company owned and consolidated 141 communities in 10 states plus the District of Columbia totaling 41,250 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Land	$	1,847,127		$	1,884,403
	Depreciable property — held and used:
	Building, improvements, and furniture, fixtures and equipment	5,876,717			5,591,368
	Under development:
	Land	110,769			151,154
	Construction in progress	356,644			339,894
	Real estate sold or held for sale:
	Land	10,751			22,766
	Building, improvements, and furniture, fixtures and equipment	5,969			66,243
	Real estate owned	8,207,977			8,055,828
	Accumulated depreciation	(2,208,794		)	(1,924,682		)
	Real estate owned, net	$	5,999,183		$	6,131,146
	In June 2013, the Company sold a 50% interest in five partnerships (the “UDR/MetLife Vitruvian Park® Partnerships”) to MetLife for approximately $141.3 million, before transaction costs of $936,000. The properties held by the UDR/MetLife Vitruvian Park® Partnerships are located in Addison, Texas and consist of two operating communities with 739 apartment homes, one recently completed development community in lease-up with 391 apartment homes, and 28.4 acres of developable land parcels. The transaction resulted in a gain of approximately $436,000 which the Company has deferred until the terms of the construction completion guarantee have been met. The UDR/MetLife Vitruvian Park® Partnerships 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 operations of the UDR/MetLife Vitruvian Park® Partnerships' assets, prior to the sale of a 50% interest, have been classified as a component of continuing operations on the Consolidated Statements of Operations, as UDR has continuing involvement over the duration of the partnership.
	In December 2013, the Company sold a 49% interest to MetLife in the Company’s fully-entitled 399 Fremont land parcel located in San Francisco, California for approximately $29.9 million. In conjunction with the sale, the Company formed a new unconsolidated joint venture, UDR/MetLife 399 Fremont, to develop a $318 million, 447-home, luxury high-rise tower on the site. As the Company recently acquired the 399 Fremont land parcel, the sale price was equivalent to the cost basis resulting in no gain or loss on the transaction. For more information on this transaction see Note 5, Joint Ventures and Partnerships.
	In December 2013, the Company became the managing partner of two joint ventures resulting in consolidation of both and increasing the real estate owned by $129.4 million. See Note 5, Joint Ventures and Partnerships, for further details.
	In January 2014, the Company acquired a fully-entitled land parcel for future development located in Huntington Beach, California for $78.0 million.
	In 2012, the Company acquired the remaining 80% ownership interests in two apartment communities (633 homes) for $11.7 million from one of our joint ventures. Also the Company acquired our partners’ interests in two development joint ventures and two joint ventures, which owned parcels of land for future development. Total acquisition value of these communities and land parcels at the acquisition date was recorded as $102.1 million to land; $38.8 million to buildings, improvements and furniture, fixtures, and equipment; $1.5 million to intangible assets; and $38.1 million to assumed debt and liabilities.
	The Company incurred $59,000, $2.3 million and $4.8 million of acquisition-related costs during the years ended December 31, 2013, 2012, and 2011, respectively. These expenses are reported within the line item General and Administrative on the Consolidated Statements of Operations.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]	'
DISCONTINUED OPERATIONS	'
	DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE
	The results of operations for properties sold during the year or designated as held for sale at the end of the year are classified as discontinued operations for all periods presented. 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. The presentation of discontinued operations does not have an impact on net income/(loss) attributable to common stockholders, and results in the reclassification of the operating results of all properties sold or classified as held for sale through December 31, 2013, within the Consolidated Statements of Operations for the years ended December 31, 2013, 2012, and 2011, and the reclassification of the assets and liabilities within the Consolidated Balance Sheets as of December 31, 2013 and 2012, if applicable. The gain/(loss) on the sale of depreciable properties, net of tax and the income/(loss) attributable to disposed properties are reported within the line item Income/(Loss) from Discontinued Operations, Net of Tax on the Consolidated Statements of Operations.
	During the year ended December 31, 2013, the Company sold two communities in the Sacramento market with 914 apartment homes for gross proceeds of $81.1 million. During the year ended December 31, 2012, the Company sold 21 communities with 6,507 apartment homes for gross proceeds of $609.4 million. During the year ended December 31, 2011, the Company sold 18 communities with 4,488 apartment homes, which included six communities with 1,418 apartment homes sold in conjunction with an asset exchange, for gross proceeds of $593.4 million.
	The Company had one commercial operating property under contract to sell for approximately $10.8 million that met the criteria to be classified as held for sale and included in Income/(Loss) from Discontinued Operations, Net of Tax on the Consolidated Statements of Operations at December 31, 2013. In December 2013, the Company recognized an impairment loss of $1.5 million, net of tax, on this property under a Level 3 assessment as the purchase price less estimated cost of sale was less than the carrying value.
	During the years ended December 31, 2013, 2012, and 2011, UDR recognized net gain/(loss) on the sale of depreciable properties, before tax of $41.9 million, $260.4 million, and $138.5 million, respectively, which are included in Income/(Loss) from Discontinued Operations, Net of Tax on the Consolidated Statements of Operations.
	The following is a summary of income/(loss) from discontinued operations, net of tax for the years ended December 31, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Rental income	$	9,152		$	39,543		$	117,269
	Rental expenses	3,511			14,106			44,100
	Property management	252			1,087			3,226
	Real estate depreciation	1,958			8,475			45,713
	Interest and other (income)/expense, net	(62		)	821			2,066
	Income/(loss) attributable to disposed properties and assets held for sale	3,493			15,054			22,164
	Net gain/(loss) on the sale of depreciable property	41,919			260,404			138,508
	Impairment charges	(2,355		)	—			—
	Income tax benefit/(expense)	885			(8,850		)	(13,218		)
	Income/(loss) from discontinued operations, net of tax	$	43,942		$	266,608		$	147,454
	Income/(loss) from discontinued operations attributable to UDR, Inc.	$	42,364		$	256,533		$	142,122

Joint_Ventures

Joint Ventures	12 Months Ended
	Dec. 31, 2013
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 an entity in which we own less than 100% but control the joint venture or partnership 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.
	Consolidated Joint Ventures
	In December 2013, the Company consolidated its 95%/5% development joint ventures 13th and Market in San Diego, CA and Domain College Park in Metropolitan, D.C. The consolidation was due to the Company becoming the managing partner of each of the joint ventures pursuant to amendments to the LLC Agreements. In connection with the amendments, our partner received equity distributions reducing its capital account balances to zero, the Company replaced our partner as the managing partner, and our partner no longer has the ability to substantively participate in the decision-making process, with only protective rights remaining. We accounted for the consolidations as asset acquisitions since the joint ventures were under development and not complete at the time of consolidation resulting in no gain or loss upon consolidation and increasing our real estate owned by $129.4 million and our debt owed by $63.6 million. In addition pursuant to the amendments, the Company paid a non-refundable deposit to our partner in January 2014 of $2.0 million for each joint venture, or $4.0 million in total, for the right to exercise options in 2014 to acquire our partner’s upside participation in the joint ventures. The non-refundable deposits will be applied towards the future purchase price, which will be equivalent to our partner’s right to receive certain upside participation from the developments.
	In May 2012, the Company formed a joint venture with an unaffiliated third party to acquire Pier 4 (land for future development) in Boston, Massachusetts. At closing, UDR owned a 98.0% interest in the joint venture. The Company’s total investment of $26.6 million consisted of our initial investment and the acquisition of its partner’s 2.0% ownership interest in the joint venture in 2012.
	In September 2012, the Company formed a joint venture with an unaffiliated third party to acquire 3032 Wilshire (land for future development) in Santa Monica, California. At closing and at December 31, 2013, UDR owned a controlling interest of 95% in the joint venture for an initial investment of $10.3 million.
	In October 2012, the Company formed a joint venture with an unaffiliated third party to acquire 2919 Wilshire (land for future development) in Santa Monica, California. At closing and at December 31, 2013, UDR owned a controlling interest of 95% in the joint venture for an initial investment of $7.0 million.
	In 2011, the Company invested in a joint venture with an unaffiliated third party to acquire and redevelop Beach Walk, an existing commercial property, into a 173 apartment home community in Huntington Beach, California. At closing, the Company contributed $9.0 million and owned a 90% controlling interest in the investment. Under the terms of the operating agreement, our partner was required to achieve certain criteria as it relates to the entitlement process. If the criteria were met on or before 730 days after the site plan application was deemed complete by the City of Huntington Beach, the Company was obligated to contribute an additional $3.0 million to the joint venture for distribution to our partner. At the acquisition date, the Company accrued and capitalized $3.0 million related to the contingent consideration, which represented the difference between fair value of the property of $9.8 million on the formation date and the estimated fair value of the underlying property upon completion of the entitlement process of $12.8 million. The Company estimated the fair value based on Level 3 inputs utilized in a third party valuation. In 2012, the Company paid the joint venture partner a total of $4.1 million for its 10% noncontrolling interest and settlement of the contingent consideration.
	Unconsolidated 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, 2013 and 2012 (dollars in thousands):
	Joint Venture	Location of Properties		Number of Properties		Number of Apartment Homes		Investment at						UDR’s Ownership Interest
				2013		2013		2013			2012			2013				2012
	Operating and development:
	UDR/MetLife I (a)	Various		8 operating communities		1,641		$	47,497		$	74,964		13.2			%	13.3			%
				7 land parcels		N/A								4			%	4.3			%
	UDR/MetLife II (a)	Various		15 operating communities		3,119		327,926			326,600			50			%	50			%
	UDR/MetLife Vitruvian Park® (b)	Addison, TX		2 operating communities		739		79,318			—			50			%	—
				1 non-stabilized community		391
				6 land parcels		N/A
	UDR/MetLife 399 Fremont (c)	San Francisco, CA		1 development community (*)		447		36,313			—			51			%	—
	UDR/KFH (d)	Washington, D.C.		3 operating communities		660		25,919			29,589			30			%	30			%
	Texas (e)	Texas		8 operating communities		3,359		(23,591		)	(25,309		)	20			%	20			%
	Lodge at Stoughton (f)	Stoughton, MA		—		—		—			16,311			—				95			%
	13th & Market (g)	San Diego, CA		—		—		—			29,930			—				95			%
	Domain College Park (g)	College Park, MD		—		—		—			25,546			—				95			%
	Investment in and advances to unconsolidated joint ventures, net, before participating loan investment							493,382			477,631
		Location		Preferred Return		Years To Maturity		Investment at						Income From Participating Loan Investment For The Years Ended
	Participating loan investment:							2013			2012			2013		2012			2011
	Steele Creek (h)	Denver, CO		6.50%		3.8		14,273			—			$156		$—			$—
	Total investment in and advances to unconsolidated joint ventures, net							$	507,655		$	477,631
	(*)    The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes. The number of apartment homes completed as of December 31, 2013 for one development community at UDR/MetLife 399 Fremont was zero.
	(a) In June 2013 and within UDR/MetLife I, the Company exchanged with MetLife its approximately 10% ownership interest in four operating communities and paid MetLife an additional $15.6 million in cash for an increased ownership interest of approximately 35% in two high-rise operating communities, bringing UDR's ownership interest in the two high-rise operating communities to 50% each. The two high-rise operating communities are located in Denver, Colorado and San Diego, California and were subsequently contributed to UDR/MetLife II. The four operating communities in which UDR exchanged its ownership interest are located in Washington D.C.; San Francisco, California; Dallas, Texas; and Charlotte, North Carolina. At 50% ownership, the Company's pro-rata share of the undepreciated book value of the UDR/MetLife II joint venture assets and outstanding debt was $796.4 million and $444.6 million, respectively, at June 30, 2013. UDR continues to fee manage the four operating communities in which UDR exchanged its ownership interests.
	In November 2012, the Company exchanged its 12% ownership interest in four operating communities and 3.1% ownership in two land parcels in UDR/MetLife I, and paid MetLife $10.0 million in cash for an additional 41% ownership interest in The Olivian, a high-rise building located in downtown Seattle, bringing UDR’s ownership interest in The Olivian to 50%. The community was contributed to UDR/MetLife II. The properties and land parcels, in which UDR exchanged its ownership interest, are located in Houston, Texas; Tampa, Florida; Charlotte, North Carolina; and Chicago, Illinois. UDR continued to fee manage the four operating communities.
	In January 2012, the Company formed a new real estate joint venture, UDR/MetLife II, with MetLife, in which each party owned a 50% interest. The 12 communities in the joint venture included seven from UDR/MetLife I, while the remaining five operating communities were newly acquired by UDR/MetLife II. The newly acquired communities, collectively known as Columbus Square, were recently developed, high-rise apartment buildings located on the Upper West Side of Manhattan and were purchased for $637.5 million. The Company serves as the general partner with significant participating rights held by our partner. The Company earns property management, asset management and financing fees. Our initial investment was $327.1 million, which consisted of $293.5 million of cash paid and $33.6 million of our equity in the seven communities transferred from UDR/MetLife I.
	(b) In June 2013, the Company sold a 50% interest in five partnerships (the “UDR/MetLife Vitruvian Park® Partnerships”) to MetLife for approximately $141.3 million. The transaction resulted in a gain of approximately $436,000 which the Company has deferred until the terms of the construction completion guarantee have been met. Under the terms of the UDR/MetLife Vitruvian Park® Partnerships, the Company serves as the general partner with significant participating rights held by our partner, and earns fees for property management, asset management, and financing transactions. The UDR/MetLife Vitruvian Park® Partnerships are accounted for under the equity method of accounting. Our initial investment was approximately $80.2 million, which consisted of approximately $140.0 million (50% of our net book value of the real estate at the time of the transaction) reduced by our share of the net proceeds received upon encumbering the assets of approximately $58.7 million and other operating adjustments.
	At closing, a total of $118.3 million of secured debt was placed on the two operating communities and the community under development. The debt on the two operating communities carries an interest rate of 4.0% with a term of ten years and the non-recourse construction loan on the community under development carries an interest rate of LIBOR plus 175 basis points with a term of two years and two one-year extension options. The Company has guaranteed the completion of the construction of the development. Proceeds from the construction loan will be used for completion of construction of the development. Upon completion, at its 50% ownership, the Company's pro-rata share of the undepreciated book value of the UDR/MetLife Vitruvian Park® Partnerships' real estate assets and outstanding debt will be approximately $145.0 million and $62.8 million, respectively.
	(c) In January 2012, the Company formed a joint venture with an unaffiliated third party to acquire 399 Fremont (land for future development) in San Francisco, California. At closing, UDR owned a noncontrolling interest of 92.5% in the joint venture. The Company’s total investment was $55.5 million, which consists of its initial investment of $37.3 million and an option to exercise its right to acquire its partner’s 7.5% ownership interest in the joint venture. In October 2012, the Company exercised its option and paid $13.5 million. In January 2013, the Company subsequently acquired its partner’s 7.5% ownership interest for $4.7 million. In December 2013, the Company sold a 49% interest to MetLife in the fully-entitled 399 Fremont land parcel for approximately $29.9 million. In conjunction with the sale, the Company formed a new unconsolidated real estate joint venture with MetLife, UDR/MetLife 399 Fremont, to develop a $318 million, 447-home, luxury high-rise tower on the site. Construction commenced in the first quarter 2014. As the Company recently acquired the 399 Fremont land parcel, the sale price was equivalent to the cost basis resulting in no gain or loss on the transaction. Under the terms of the partnership, the Company serves as the general partner with significant participating rights held by our partner, and has the ability to earn fees for development management, property management, asset management, and financing transactions. The UDR/MetLife 399 Fremont Partnership is accounted for under the equity method of accounting. Our initial investment was approximately $31.1 million.
	(d) UDR is a partner with an unaffiliated third party, which formed a joint venture for the investment of up to $450 million in multifamily properties located in key, high barrier to entry markets. The partners will contribute equity of $180 million of which the Company’s maximum equity will be 30% or $54 million when fully invested.
	(e) During the year ended December 31, 2012, the Company acquired the remaining 80% ownership interests in two apartment communities (633 homes) in Austin, Texas for $11.7 million from the joint venture. The Company’s investment in the joint venture at December 31, 2013 and 2012 was net of deferred profits on the sale of depreciable properties to the joint venture of $24.0 million and $28.5 million, respectively.
	(f) In December 2013, the Company sold its 95% interest in the Lodge at Stoughton, a recently developed unconsolidated joint venture community located in the greater Boston area, for approximately $48.5 million based on our 95% ownership, which resulted in a gain (before tax) of approximately $8.3 million. In conjunction with the sale, the Company provided the buyer with a $40.8 million three-month bridge loan at LIBOR plus a spread of 350 basis points with two three-month extension options at increased rates.
	(g) In December 2013, the Company consolidated its 95%/5% development joint ventures 13th and Market in San Diego, CA and Domain College Park in Metropolitan, D.C. The consolidation was due to the Company becoming the managing partner of each of the joint ventures. For additional information, see the “Consolidated Joint Ventures” section above.
	(h) In October 2013, the Company entered into a participating debt financing arrangement with a third party that is developing a $108 million, 218-home, high-rise luxury community located adjacent to the Cherry Creek Mall in Denver, Colorado. Per the terms of the agreement, UDR will finance up to 85%, or approximately $92.0 million, of the development cost at an interest rate of 6.5% per annum on the outstanding debt balance. In addition, the Company has the option to purchase the community upon completion of construction and has a 50% participating interest in the profit upon the acquisition of the community or sale to a third party. The Company will account for the arrangement consistent with an investment in real estate under the equity method of accounting. As of December 31, 2013, our loan receivable balance was $14.3 million which was included in Investment In and Advances To Unconsolidated Joint Ventures on the Consolidated Balance Sheets. Also we recognized $156,000 of interest income included in Income/(Loss) from Unconsolidated Entities on the Consolidated Statements of Operations.
	As of December 31, 2013 and 2012, the Company had deferred fees and deferred profit from the sale of properties to joint ventures or partnerships of $25.4 million and $29.4 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 $11.2 million, $11.8 million, and $9.6 million of management fees during the years ended December 31, 2013, 2012, and 2011, 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 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, 2013, 2012, and 2011.
	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, 2013, 2012, and 2011 (dollars in thousands):
	As of and For the Year Ended December 31, 2013	UDR/MetLife I			UDR/MetLife II			UDR/MetLife Vitruvian Park®			Texas			UDR/KFH				Other joint ventures				Total
	Condensed Statements of Operations:
	Total revenues	$	52,532		$	109,926		$	7,680		$	39,273		$	19,221			$	5,324			$	233,956
	Property operating expenses	24,191			33,809			4,633			18,279			7,035				3,292				91,239
	Real estate depreciation and amortization	14,150			30,122			3,830			17,911			14,199				3,564				83,776
	Operating income/(loss)	14,191			45,995			(783		)	3,083			(2,013		)		(1,532		)		58,941
	Interest expense	(15,162		)	(37,055		)	(1,886		)	(12,667		)	(5,872		)		(913		)		(73,555		)
	Other income/(expense)	3			1			—			—			—				—				4
	Income/(loss) from discontinued operations	(21,465		)	—			—			—			—				—				(21,465		)
	Net income/(loss)	$	(22,433	)	$	8,941		$	(2,669	)	$	(9,584	)	$	(7,885	)		$	(2,445	)		$	(36,075	)
	UDR recorded income (loss) from unconsolidated entities	$	(4,675	)	$	4,471		$	(2,851	)	$	(1,218	)	$	(2,366	)		$	6,224			$	(415	)
	Condensed Balance Sheets:
	Total real estate, net	$	830,813		$	1,476,588		$	283,878		$	218,669		$	249,097			$	65,133			$	3,124,178
	Cash and cash equivalents	7,817			16,454			3,498			11,734			2,289				—				41,792
Other assets	10,855			16,666			1,578			1,578			1,474				83				32,234
Total assets	849,485			1,509,708			288,954			231,981			252,860				65,216				3,198,204
Amount due to UDR	5,941			2,275			1,352			1,063			420				1,136				12,187
Third party debt	339,365			877,799			120,999			219,588			165,209				—				1,722,960
Accounts payable and accrued liabilities	6,113			14,508			7,152			9,742			1,234				2,813				41,562
Total liabilities	351,419			894,582			129,503			230,393			166,863				3,949				1,776,709
Total equity	$	498,066		$	615,126		$	159,451		$	1,588		$	85,997			$	61,267			$	1,421,495
UDR’s investment in unconsolidated joint ventures	$	47,497		$	327,926		$	79,318		$	(23,591	)	$	25,919			$	50,586			$	507,655
As of and For the Year Ended December 31, 2012	UDR/MetLife I			UDR/MetLife II			UDR/MetLife Vitruvian Park® (a)			Texas			UDR/KFH				Other joint ventures (a)				Total
Condensed Statements of Operations:
Total revenues	$	56,099		$	87,386		$	—		$	37,090		$	18,670			$	2,724			$	201,969
Property operating expenses	25,084			25,737			—			17,053			6,831				1,368				76,073
Real estate depreciation and amortization	16,310			32,553			—			18,448			16,546				1,897				85,754
Operating income/(loss)	14,705			29,096			—			1,589			(4,707		)		(541		)		40,142
Interest expense	(16,725		)	(29,170		)	—			(12,704		)	(5,890		)		(561		)		(65,050		)
Other income/(expense)	(5		)	(9		)	—			—			—				—				(14		)
Income/(loss) from discontinued operations	10,890			—			—			10,075			—				—				20,965
Net income/(loss)	$	8,865		$	(83	)	$	—		$	(1,040	)	$	(10,597	)		$	(1,102	)		$	(3,957	)
UDR recorded income/(loss) from unconsolidated entities	$	(1,750	)	$	15		$	—		$	(2,399	)	$	(3,221	)		$	(1,224	)		$	(8,579	)
Condensed Balance Sheets:
Real estate held for sale, net	$	243,755		$	—		$	—		$	—		$	—			$	—			$	243,755
Total real estate, net	945,784			1,346,698			—			232,733			260,911				105,800				2,891,926
Cash and cash equivalents	13,496			13,002			—			11,002			2,697				1,212				41,409
Other assets	9,497			14,216			—			3,487			1,794				1,884				30,878
Total assets	1,212,532			1,373,916			—			247,222			265,402				108,896				3,207,968
Amount due to UDR	1,456			3,979			—			1,150			443				201				7,229
Third party debt	385,391			775,444			—			219,588			165,209				—				1,545,632
Third party debt related to real estate held for sale	89,640			—			—			—			—				30,637				120,277
Accounts payable and accrued liabilities	12,327			15,615			—			11,056			1,492				6,700				47,190
Total liabilities	488,814			795,038			—			231,794			167,144				37,538				1,720,328
Total equity, inclusive of noncontrolling interest	$	723,718		$	578,878		$	—		$	15,428		$	98,258			$	71,358			$	1,487,640
UDR’s investment in unconsolidated joint ventures	$	74,964		$	326,600		$	—		$	(25,309	)	$	29,589			$	71,787			$	477,631
For the Year Ended December 31, 2011	UDR/MetLife I			UDR/MetLife II (a)			UDR/MetLife Vitruvian Park® (a)			Texas			UDR/KFH				Other joint ventures				Total
Condensed Statements of Operations:
Total revenues	$	48,628		$	—		$	—		$	35,130		$	5,741			$	—			$	89,499
Property operating expenses	25,297			—			—			16,202			7,775				—				49,274
Real estate depreciation and amortization	15,699			—			—			18,040			4,310				—				38,049
Operating income/(loss)	7,632			—			—			888			(6,344		)		—				2,176
Interest expense	(15,416		)	—			—			(12,651		)	(1,918		)		—				(29,985		)
Other income/(expense)	(154		)	—			—			—			—				—				(154		)
Income/(loss) from discontinued operations	7,246			—			—			(1,868		)	—				(436		)		4,942
Net income/(loss)	$	(692	)	$	—		$	—		$	(13,631	)	$	(8,262	)		$	(436	)		$	(23,021	)
UDR recorded income/(loss) from unconsolidated entities	$	(904	)	$	—		$	—		$	(2,726	)	$	(2,437	)		$	(285	)		$	(6,352	)
(a) These joint ventures or partnerships were formed in 2012 or 2013 resulting in no activity in prior periods. For further information on these ventures and partnerships see the section “Unconsolidated Joint Ventures and Partnerships” above.

Secured_Debt_and_Unsecured_Deb

Secured Debt and Unsecured Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
SECURED DEBT AND UNSECURED DEBT	'
	SECURED AND UNSECURED DEBT
	The following is a summary of our secured and unsecured debt at December 31, 2013 and 2012 (dollars in thousands):
		Principal Outstanding						For the Year Ended December 31, 2013
								Weighted Average			Weighted Average		Number of Communities
		December 31,						Interest Rate			Years to Maturity		Encumbered
		2013			2012
	Secured Debt:
	Fixed Rate Debt
	Mortgage notes payable (a)	$	445,706		$	455,533		5.44	%		2.5		8
	Fannie Mae credit facilities (b)	626,667			631,078			4.99	%		5		22
	Total fixed rate secured debt	1,072,373			1,086,611			5.18	%		4		30
	Variable Rate Debt
	Mortgage notes payable	63,595			37,415			2.34	%		2.1		2
	Tax-exempt secured notes payable (c)	94,700			94,700			0.84	%		9.2		2
	Fannie Mae credit facilities (b)	211,409			211,409			1.61	%		6.5		7
	Total variable rate secured debt	369,704			343,524			1.54	%		6.5		11
	Total Secured Debt	1,442,077			1,430,135			4.24	%		4.6		41
	Unsecured Debt:
	Commercial Banks
	Borrowings outstanding under an unsecured credit facility due December 2017 (d), (i)	—			76,000			—			3.9
	Senior Unsecured Notes
	3.70% Medium-Term Notes due October 2020 (net of discount of $54) (g), (i)	299,946			—			3.7	%		6.8
	4.63% Medium-Term Notes due January 2022 (net of discount of $2,882 and $3,241) (i)	397,118			396,759			4.63	%		8
	1.42% Term Notes due June 2018 (e), (i)	35,000			35,000			1.42	%		4.4
	2.50% Term Notes due June 2018 (e), (i)	65,000			65,000			2.5	%		4.4
	6.05% Medium-Term Notes due June 2013	—			122,500			—			—
	5.13% Medium-Term Notes due January 2014 (h)	184,000			184,000			5.13	%		0
	5.50% Medium-Term Notes due April 2014 (net of discount of $20 and $89)	128,480			128,411			5.5	%		0.3
	5.25% Medium-Term Notes due January 2015 (net of discount of $134 and $262)	325,041			324,913			5.25	%		1
	5.25% Medium-Term Notes due January 2016	83,260			83,260			5.25	%		2
	2.73% Term Notes due June 2018 (f) (i)	250,000			250,000			2.73	%		4.4
	8.50% Debentures due September 2024	15,644			15,644			8.5	%		10.7
	4.25% Medium-Term Notes due June 2018 (net of discount of $1,893 and $2,322) (i)	298,107			297,678			4.25	%		4.4
	Other	30			33			N/A			N/A
	Total Unsecured Debt	2,081,626			1,979,198			4.35	%		4.2
	Total Debt	$	3,523,703		$	3,409,333		4.31	%		4.4
	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 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. As of December 31, 2013, secured debt encumbered $2.3 billion or 28.2% of UDR’s total real estate owned based upon gross book value ($5.9 billion or 71.8% of UDR’s real estate owned based on gross book value is unencumbered).
	(a) At December 31, 2013, fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from December 2014 through May 2019 and carry interest rates ranging from 3.43% to 5.94%.
	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. During the years ended December 31, 2013, 2012, and 2011, the Company had $5.1 million, $4.9 million, and $3.5 million of amortization expense on the fair market adjustment of debt assumed in acquisition of properties, respectively, which was included in Interest Expense on the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $11.8 million and $16.9 million at December 31, 2013 and 2012, respectively.
	(b) UDR has three secured credit facilities with Fannie Mae with an aggregate commitment of $838.1 million at December 31, 2013. 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, 2013, we have $626.7 million of the outstanding balance fixed at a weighted average interest rate of 4.99% and the remaining balance of $211.4 million on these facilities is currently at a weighted average variable interest rate of 1.61%.
	On June 28, 2013, the Company refinanced $186 million of a Fannie Mae credit facility that carried an interest rate equal to LIBOR plus a spread of 284 basis points and was scheduled to mature in 2019. The new loans include a $90 million, 7-year fixed-rate loan that carries an interest rate of 3.95% and a $96 million, 10-year variable-rate loan that carries an interest rate equal to LIBOR plus a spread of 190 basis points. Three of the Company's communities were released from the facility and added to the Company's unencumbered asset pool in connection with the refinancing.
	Further information related to these credit facilities is as follows (dollars in thousands):
		December 31, 2013			31-Dec-12
	Borrowings outstanding	$	838,076		$	842,487
	Weighted average borrowings during the period ended	839,597			903,817
	Maximum daily borrowings during the period ended	841,494			1,054,735
	Weighted average interest rate during the period ended	4.2		%	4.3		%
	Weighted average interest rate at the end of the period	4.1		%	4.4		%
	(c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature on August 2019 and March 2032, respectively. Interest on these notes is payable in monthly installments. The variable mortgage notes have interest rates of 0.79% and 0.95%, respectively as of December 31, 2013.
	(d) The Company has a $900 million unsecured revolving credit facility. In June 2013, the Company amended its unsecured revolving credit facility. The amendment extended the maturity date to December 2017, includes a six month extension option, and contains an accordion feature that allows the Company to increase the facility to $1.45 billion. Based on the Company's current credit rating, the credit facility carries an interest rate equal to LIBOR plus a spread of 110 basis points and a facility fee of 20 basis points. In the third quarter of 2013, the Company paid off the balance outstanding under the revolving credit facility. As of December 31, 2013, the Company had no balance outstanding under the revolving credit facility.
	The following is a summary of short-term bank borrowings under UDR’s bank credit facility at December 31, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Total revolving credit facility	$	900,000		$	900,000
	Borrowings outstanding at end of period (1)	—			76,000
	Weighted average daily borrowings during the period ended	169,844			167,038
	Maximum daily borrowings during the period ended	372,000			788,000
	Weighted average interest rate during the period ended	1.2		%	1.5		%
	Interest rate at end of the period	1.3		%	1.4		%
	(1) Excludes $2.2 million and $3.9 million of letters of credit at December 31, 2013 and 2012, respectively.
	(e) In June 2013, the Company amended and re-priced its $100 million unsecured term notes due in January 2016. The loan was re-priced from LIBOR plus 142.5 basis points to LIBOR plus 125 basis points, and the maturity date was extended to June 2018.
	(f) In June 2013, the Company amended and re-priced its $250 million unsecured term notes due in January 2016. The loan was re-priced from LIBOR plus 142.5 basis points to LIBOR plus 125 basis points, and the maturity date was extended to June 2018.
	(g) On September 26, 2013, the Company issued $300 million of 3.70% senior unsecured medium-term notes due October 2020. Interest is payable semiannually beginning in April 2014. The notes were priced at 99.981% of the principal amount at issuance and had a discount of $54,000 at December 31, 2013. We used the net proceeds to repay the borrowings outstanding on our $900 million unsecured credit facility and for general corporate purposes. The notes are fully and unconditionally guaranteed by the Operating Partnership.
	(h) In January 2014, we paid off $184 million of 5.13% medium-term notes due January 2014 with the borrowings under the Company’s $900 million unsecured revolving credit facility.
(i) The Operating Partnership is a guarantor at December 31, 2013 and 2012.
The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next five years subsequent to December 31, 2013 are as follows (dollars in thousands):
Year		Total Fixed Secured Debt			Total Variable Secured Debt			Total Secured Debt			Total Unsecured Debt (a)		Total Debt
2014		$	48,035		$	—		$	48,035		$	311,574	$	359,609
2015		197,210			—			197,210			324,382		521,592
2016		136,431			63,595			200,026			82,478		282,504
2017		178,398			65,000			243,398			—		243,398
2018		176,483			50,000			226,483			648,646		875,129
Thereafter		335,816			191,109			526,925			714,546		1,241,471
Total		$	1,072,373		$	369,704		$	1,442,077		$	2,081,626	$	3,523,703
(a) With the exception of the 1.42% Term Notes due June 2018 and revolving credit facility which carry a variable interest rate, all unsecured debt carries fixed interest rates.
We were in compliance with the covenants of our debt instruments at December 31, 2013.

IncomeLoss_Per_Share_Notes

Income/(Loss) Per Share (Notes)	12 Months Ended
	Dec. 31, 2013
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):
		Years Ended December 31,
		2013				2012			2011
	Numerator for income/(loss) per share:
	Income/(loss) from continuing operations	$	2,340			$	(46,305	)	$	(126,869	)
	(Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership	48				2,089			4,937
	(Income)/loss from continuing operations attributable to noncontrolling interests	60				(140		)	(167		)
	Income/(loss) from continuing operations attributable to UDR, Inc.	2,448				(44,356		)	(122,099		)
	Distributions to preferred stockholders - Series E (Convertible)	(3,724		)		(3,724		)	(3,724		)
	Distributions to preferred stockholders - Series G	—				(2,286		)	(5,587		)
	Premium on preferred stock redemption or repurchases, net	—				(2,791		)	(175		)
	Income/(loss) from continuing operations attributable to common stockholders	$	(1,276	)		$	(53,157	)	$	(131,585	)
	Income/(loss) from discontinued operations, net of tax	$	43,942			$	266,608		$	147,454
	(Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership	(1,578		)		(10,075		)	(5,332		)
	Income/(loss) from discontinued operations attributable to common stockholders	$	42,364			$	256,533		$	142,122
	Net income/(loss) attributable to common stockholders	$	41,088			$	203,376		$	10,537
	Denominator for income/(loss) per share - basic and diluted:
	Weighted average common shares outstanding	250,684				239,482			202,573
	Non-vested restricted stock awards	(715		)		(631		)	(1,279		)
	Denominator for income/(loss) per share - basic and diluted	249,969				238,851			201,294
	Income/(loss) per weighted average common share - basic and diluted:
	Income/(loss) from continuing operations attributable to common stockholders	$	(0.01	)		$	(0.22	)	$	(0.65	)
	Income/(loss) from discontinued operations attributable to common stockholders	$	0.17			$	1.07		$	0.71
	Net income/(loss) attributable to common stockholders	$	0.16			$	0.85		$	0.05
	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, 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.
	During the years ended December 31, 2013, 2012 and 2011, the effect of the conversion of the OP Units, convertible preferred stock, stock options and restricted stock is not dilutive, and is therefore 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, 2013, 2012, and 2011 (shares in thousands):
		Years Ended December 31,
		2013			2012			2011
	OP Units	9,337			9,411			7,602
	Preferred Stock	3,036			3,036			3,036
	Stock options and unvested restricted stock	1,584			1,361			2,154

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity Attributable to Parent [Abstract]	'
STOCKHOLDERSb 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, 2013.
	During the year ended December 31, 2013, the Company entered into the following equity transactions for our common stock:
	•	Issued 577,316 shares of common stock through the Company’s 1999 Long-Term Incentive Plan (the “LTIP”), net of forfeitures of 27,161; and
	•	Converted 76,291 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, 2013, 2012, and 2011 totaled $0.94, $0.88, and $0.80 per share, respectively. For taxable years ending on or before December 31, 2013, the Internal Revenues Service (“IRS”) allowed REITs to distribute up to 90% of total distributions in common shares with the residual distributed in cash as a means of enhancing liquidity.
	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, 2013, 2012, and 2011 were $1.33 per share. The Series E is not listed on any exchange. At December 31, 2013 and 2012, a total of 2,803,812 shares 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. At December 31, 2013 and 2012, a total of 2,464,183 and 2,529,194 shares, respectively, of the Series F were outstanding with an aggregate purchase value of $246 and $253, 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 any other rights, privileges or preferences.
	In May 2007, UDR issued 5,400,000 shares of the 6.75% Series G Cumulative Redeemable Preferred Stock (“Series G”). On May 31, 2012, the Company completed the redemption of all outstanding shares of its Series G. A total of 3,264,362 shares of the Series G was redeemed at a redemption price of $25 per share in cash, plus accrued and unpaid dividends to the redemption date for a total cost of $82.1 million. As a result of this redemption, the write off of additional paid in capital of $2.8 million related to the issuance of the Series G is recognized as a decrease to our net income/(loss) attributable to common stockholders. During the year ended December 31, 2011, the Company repurchased 141,200 shares of the Series G for more than the liquidation preference of $25 per share, resulting in a loss of $175,000 to our net income/(loss) attributable to common stockholders.
	Distributions declared on the Series G for the years ended December 31, 2013, 2012, and 2011 were $0.00, $0.57 and $1.69 per share, respectively. At December 31, 2013 and 2012, there were no shares of the Series G outstanding.
	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, 2013. During the year ended December 31, 2013, UDR acquired all shares issued through the open market.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2013
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, 2009, the stockholders of UDR voted to amend and restate the LTIP to increase the number of shares reserved from 4,000,000 shares to 16,000,000 shares on an unadjusted basis for issuance upon the grant or exercise of awards under the LTIP, which all can be for incentive stock option grants. The LTIP generally provides, among other things, that options are granted at exercise prices not lower than the market value of the shares on the date of grant and that options granted must be exercised within 10 years. As of December 31, 2013, there were 7,928,182 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. Unless otherwise specified in the agreement, upon the retirement 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, 2013 is as follows:
		Option Outstanding			Option Exercisable			Restricted Stock
		Number of	Weighted		Number of	Weighted		Number		Weighted
		Options	Average		Options	Average		of shares		Average Fair
			Exercise			Exercise				Value Per
			Price			Price				Restricted Stock
	Balance, December 31, 2012	2,430,127	$	12.63	2,430,127	$	12.63	328,223		$	23.35
	Granted	—	—					604,477		23.71
	Exercised	—	—					—		—
	Vested	—	—					(146,794	)	21.95
	Forfeited	—	—					(27,161	)	23.91
	Balance, December 31, 2013	2,430,127	$	12.63	2,430,127	$	12.63	758,745		$	23.89
	As of December 31, 2013, the Company had issued 3,632,305 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, 2013.
	The weighted average remaining contractual life on all options outstanding as of December 31, 2013 is 4.4 years. 1,994,957 of share options had exercise prices at $10.06; 404,291 of share options had exercise prices at $24.38; and 30,879 of share options had exercise prices at $25.10.
	During the years ended December 31, 2013, 2012, and 2011, respectively, we recognized $0.0, $95,000, and $1.1 million of 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, 2013, 2012, and 2011, we recognized $3.6 million, $3.7 million, and $4.2 million of compensation expense related to the amortization of restricted stock awards, respectively. The total remaining compensation cost on unvested restricted stock awards was $3.4 million and has a weighted average remaining contractual life of 1.5 years as of December 31, 2013.
	Long-Term Incentive Compensation
	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 Total Shareholder Return (“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 year ended December 31, 2013, we recognized $5.9 million of compensation expense related to the amortization of 2013 LTI awards. The total remaining compensation cost on unvested 2013 LTI awards was $5.3 million and has a weighted average remaining contractual life of approximately 2 years as of December 31, 2013.
	During 2010, certain officers of the Company were awarded a restricted stock grant under the 2010-2012 Long-Term Incentive Program (“2010-2012 LTI”). The actual amount of the awards that vested in 2012 was determined based upon the Company’s achievement of the specified performance metrics during the three-year performance period. The grants were valued on the grant date based upon the market price of UDR common stock on the date of grant. Compensation expense was recorded pro rata over the three-year performance period. For the years ended December 31, 2012 and 2011, we recognized $4.9 million and $4.5 million of compensation expense related to the amortization of the awards, respectively.
	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, 2013, 2012, and 2011, was $919,000, $631,000, and $700,000, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	For 2013, 2012, and 2011, 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, 2013, 2012, and 2011:
		Years Ended December 31,
		2013			2012			2011
	Ordinary income	$	0.744		$	0.174		$	0.491
	Long-term capital gain	0.114			0.186			0.074
	Unrecaptured section 1250 gain	0.067			0.515			0.205
		$	0.925		$	0.875		$	0.77
	We have taxable REIT subsidiaries (“TRS”) that are subject to state and federal 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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Income tax (benefit)/expense
	Current
	Federal	$	(1,030	)	$	1,961		$	463
	State	846			1,463			552
	Total current	(184		)	3,424			1,015
	Deferred
	Federal	(6,907		)	(21,479		)	6,646
	State	(1,190		)	(3,021		)	(90		)
	Total deferred	(8,097		)	(24,500		)	6,556
	Total income tax (benefit)/expense	$	(8,281	)	$	(21,076	)	$	7,571
	Classification of income tax (benefit)/expense
	Continuing operations	$	(7,299	)	$	(30,717	)	$	(5,647	)
	Discontinued operations	(982		)	9,641			13,218
	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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Deferred tax assets:
	Federal and state tax attributes	$	13,069		$	1,464		$	24,524
	Book/tax depreciation	19,354			12,345			10,045
	Construction capitalization differences	—			6,635			5,948
	Investment in partnerships	—			3,112			3,618
	Debt and interest deductions	10,311			—			—
	Other	—			2,009			999
	Total deferred tax assets	42,734			25,565			45,134
	Valuation allowance	(1,310		)	(1,390		)	(45,134		)
	Net deferred tax assets	41,424			24,175			—
	Deferred tax liabilities:
	Construction capitalization differences	(3,766		)	—			—
	Investment in partnerships	(5,080		)	—			—
	Other	(305		)	—			—
	Total deferred tax liabilities	(9,151		)	—			—
	Net deferred tax asset	$	32,273		$	24,175		$	—
	Income tax benefit/(expense) differed from the amounts computed by applying the U.S. statutory rate of 35% to pretax income/(loss) for the years ended December 31, 2013, 2012, and 2011 as follows (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Income tax (benefit)/expense
	U.S. federal income tax (benefit)/expense	$	(8,493	)	$	21,853		$	11,715
	State income tax provision	46			2,497			2,099
	Other items	246			(1,682		)	1,227
	Valuation allowance	(80		)	(43,744		)	(7,470		)
	Total income tax (benefit)/expense	$	(8,281	)	$	(21,076	)	$	7,571
	As of December 31, 2013, the Company, through our TRS, had federal net operating loss carryovers (“NOL”) of $25.9 million expiring in 2032 through 2033. As of December 31, 2013, the TRS had state NOLs of approximately $61.2 million expiring in 2020 through 2031. As of December 31, 2013, the Company had a valuation allowance of $1.3 million against its state NOL. During the year ended December 31, 2013, the Company had a net change of $80,000 in the valuation allowance.
	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, 2013 and 2012, UDR has no material unrecognized income tax benefits.
	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 2009. The tax years 2009 through 2012 remain open to examination by the major taxing jurisdictions to which the Company is subject.

Noncontrolling_Interests

Noncontrolling Interests	12 Months Ended
	Dec. 31, 2013
Noncontrolling Interest [Abstract]	'
NONCONTROLLING INTERESTS	'
	NONCONTROLLING INTERESTS
	Redeemable Noncontrolling Interests in the Operating Partnership
	Interests in the Operating Partnership held by limited partners are represented by OP Units. The income is allocated to holders of OP Units based upon net income attributable to common stockholders and the weighted average number of OP Units outstanding to total common shares plus OP Units outstanding during the period. Capital contributions, distributions, and profits and losses are allocated to noncontrolling interests in accordance with the terms of the individual partnership agreements.
	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 Amended and Restated Agreement of Limited Partnership of the Operating Partnership (the “Operating Partnership Agreement”), provided that such OP Units have been outstanding for at least one year. UDR, as the 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 the Company for each OP Unit), as defined in the Operating Partnership Agreement. 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 for the years ended December 31, 2013 and 2012 (dollars in thousands):
		Years Ended December 31,
		2013			2012
	Redeemable noncontrolling interests in the Operating Partnership, December 31, 2012	$	223,418		$	236,475
	Mark to market adjustment to redeemable noncontrolling interests in the Operating Partnership	3,656			(11,392		)
	Conversion of OP Units to Common Stock	(1,817		)	(529		)
	Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership	1,530			7,986
	Distributions to redeemable noncontrolling interests in the Operating Partnership	(9,440		)	(9,202		)
	Allocation of other comprehensive income/(loss)	250			80
	Redeemable noncontrolling interests in the Operating Partnership, December 31, 2013	$	217,597		$	223,418
	The following sets forth net income/(loss) attributable to common stockholders and transfers from redeemable noncontrolling interests in the Operating Partnership for the following periods (dollars in thousands):
			Years Ended December 31,
			2013			2012		2011
	Net income/(loss) attributable to common stockholders		$	41,088		$	203,376	$	10,537
	Conversion of OP units to UDR Common Stock		1,817			529		287
	Change in equity from net income/(loss) attributable to common stockholders and conversion of OP units to UDR Common Stock		$	42,905		$	203,905	$	10,824
	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, 2013, 2012, and 2011, net (income)/loss attributable to noncontrolling interests was $60,000, $(140,000), and $(167,000), respectively.
	During the year ended December 31, 2012, the Company acquired all of the noncontrolling interests in two consolidated affiliates for $4.9 million, one of which owns a 434 apartment home community for $4.0 million and the other is a development project for $900,000. See the “Consolidated Joint Ventures” section of Note 5, Unconsolidated Joint Ventures and Partnerships, for additional information on the consolidated development joint venture.

Fair_Value_of_Derivatives_and_

Fair Value of Derivatives and Financial Instruments	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 are summarized as follows (dollars in thousands):
						Fair Value at December 31, 2013, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2013		Fair Value Estimate at December 31, 2013		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs
						Assets or		Inputs		(Level 3)
						Liabilities		(Level 2)
						(Level 1)
	Description:
	Notes receivable (a)	$	83,033	$	83,833	$	—	$	—	$	83,833
	Total assets	$	83,033	$	83,833	$	—	$	—	$	83,833
	Derivatives - Interest rate contracts (b)	$	4,965	$	4,965	$	—	$	4,965	$	—
	Secured debt instruments - fixed rate: (c)
	Mortgage notes payable	445,706		466,375		—		—		466,375
	Fannie Mae credit facilities	626,667		661,094		—		—		661,094
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	63,595		63,595		—		—		63,595
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments (c):
	Senior unsecured notes	2,081,626		2,149,003		—		—		2,149,003
	Total liabilities	$	3,528,668	$	3,651,141	$	—	$	4,965	$	3,646,176
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	217,597	$	217,597	$	—	$	217,597	$	—
						Fair Value at December 31, 2012, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2012		Fair Value Estimate at December 31, 2012		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs (Level 3)
						Assets or		Inputs (Level 2)
						Liabilities (Level 1)
	Description:
	Notes receivable (a)	$	64,006	$	64,930	$	—	$	—	64,930
	Derivatives- Interest rate contracts (b)	2		2		—		2		—
	Total assets	$	64,008	$	64,932	$	—	$	2	$	64,930
	Derivatives- Interest rate contracts (b)	$	11,022	$	11,022	$	—	$	11,022	$	—
	Secured debt instruments- fixed rate: (c)
	Mortgage notes payable	455,533		494,728		—		—		494,728
	Fannie Mae credit facilities	631,078		689,295		—		—		689,295
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	37,415		37,415		—		—		37,415
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments: (c)
	Commercial bank	76,000		76,000		—		—		76,000
	Senior unsecured notes	1,903,198		2,039,736		—		—		2,039,736
	Total liabilities	$	3,420,355	$	3,654,305	$	—	$	11,022	$	3,643,283
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	223,418	$	223,418	$	—	$	223,418	$	—
	(a)	See Note 2, Significant Accounting Policies.
	(b)	See Note 13, Derivatives and Hedging Activity.
	(c)	See Note 6, Secured Debt and Unsecured Debt.
	(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, 2013 and 2012, 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 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 are classified as Level 2.
	Financial Instruments Not Carried at Fair Value
	At December 31, 2013, 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, 2013 and 2012, respectively.
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_Activi

Derivatives and Hedging Activity	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the years ended December 31, 2013, 2012, and 2011, the Company recorded less than a  $1,000 loss from ineffectiveness in earnings attributable to reset date and index mismatches between the derivative and the hedged item, and the fair value of interest rate swaps that were not zero at inception of the hedging relationship. During the year ended December 31, 2011, the Company reclassified a $58,000 loss from Other Comprehensive Income/(Loss) to earnings due to forecasted transactions that were no longer probable of occurring, which was the result of the sale of an operating apartment community.
	Amounts reported in Accumulated Other Comprehensive Income/(Loss), Net in the Consolidated Balance Sheets related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Through December 31, 2014, the Company estimates that an additional $4.4 million will be reclassified as an increase to interest expense.
	As of December 31, 2013, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):
	Interest Rate Derivative		Number of Instruments		Notional
	Interest rate swaps		11		$	419,787
	Interest rate caps		5		$	274,291
	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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a gain/(loss) of $271,000, $290,000, and $(23,000) for the years ended December 31, 2013, 2012, and 2011, respectively.
	As of December 31, 2013, 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		2		$	155,197
	Tabular Disclosure of Fair Values of Derivative Instruments on the 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, 2013 and 2012 (dollars in thousands):
		Asset Derivatives										Liability Derivatives
				Fair Value at:										Fair Value at:
		Balance		December 31,				December 31,				Balance		December 31,				December 31,
		Sheet Location		2013				2012				Sheet Location		2013				2012
	Derivatives designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	2			Other liabilities		$	4,965			$	11,022
	Total			$	—			$	2					$	4,965			$	11,022
	Derivatives not designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	—			Other liabilities		$	—			$	—
	Total			$	—			$	—					$	—			$	—
	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, 2013, 2012, and 2011 (dollars in thousands):
			Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)												Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)											Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Derivatives in Cash Flow Hedging Relationships		2013				2012				2011						2013				2012				2011				2013		2012		2011
	Interest rate products		$	(469	)		$	(4,924	)		$	(16,477	)		Interest expense		$	(6,851	)		$	(7,649	)		$	(9,132	)	Interest expense	$	—	$	—	$	(58	)
	Total		$	(469	)		$	(4,924	)		$	(16,477	)				$	(6,851	)		$	(7,649	)		$	(9,132	)		$	—	$	—	$	(58	)
	Derivatives Not Designated as Hedging Instruments		Location of Gain or (Loss) Recognized in Income on Derivative		Amount of Gain or (Loss) Recognized in Income on Derivative
					2013				2012				2011
	Interest rate products		Interest and other income/(expense), net		$	271			$	290			$	(23	)
	Total				$	271			$	290			$	(23	)
	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, 2013 and 2012, 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, 2013, 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 $5.5 million. If the Company had breached any of these provisions at December 31, 2013, it would have been required to settle its obligations under the agreements at their termination value of $5.5 million.
	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, 2013 and December 31, 2012:
	Offsetting of Derivative Assets
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Assets				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)				Financial Instruments				Cash Collateral Received				Net Amount
	December 31, 2013		$	—			$	—			$	—			$	—			$	—			$	—
	December 31, 2012		$	2			$	—			$	2			$	—			$	—			$	2
	(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.
	Offsetting of Derivative Liabilities
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)				Financial Instruments				Cash Collateral Posted				Net Amount
	December 31, 2013		$	4,965			$	—			$	4,965			$	—			$	—			$	4,965
	December 31, 2012		$	11,022			$	—			$	11,022			$	—			$	—			$	11,022
	(b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
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, 2013 (dollars in thousands):
		Number of		Costs Incurred			Expected Costs			Average Ownership
		Properties		to Date			to Complete (unaudited)			Stake
	Wholly-owned — under development	6		$	467,413	(a)	$	230,137		100	%
	Wholly-owned — redevelopment	2		134,261		(a)	39,039			100	%
	Joint ventures:
	Unconsolidated joint ventures	2		160,738			130,182		(b)	51	%
	Participating loan investments	1		14,273			77,736		(c)	0	%
				$	776,685		$	477,094
	(a) Costs incurred to date include $41.8 million and $7.7 million of accrued fixed assets for development and
	redevelopment, respectively.
	(b) Represents UDR’s remaining equity commitment of unconsolidated joint ventures.
	(c) Represents UDR’s remaining participating loan commitment for Steele Creek.
	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 2016. Future minimum lease payments as of December 31, 2013 are as follows (dollars in thousands):
			Ground			Office Space
			Leases (a)
	2014		$	5,270		$	691
	2015		5,270			633
	2016		5,270			47
	2017		5,270			—
	2018		5,270			—
	Thereafter		314,501			—
			$	340,851		$	1,371
	(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 $5.2 million, $5.1 million, $4.9 million of ground rent expense for the years ended December 31, 2013, 2012, and 2011, respectively. These costs are reported within the line item Other Operating Expenses on the Consolidated Statements of Operations. The Company incurred $1.3 million, $1.1 million, $1.2 million of rent expense related to office space for the years ended December 31, 2013, 2012, and 2011, respectively. These costs are included in General and Administrative on the Consolidated Statements of Operations.
	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, 2013
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 net operating income (“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, 2012 and held as of December 31, 2013. 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 were acquired or developed in 2011, 2012, or 2013, sold properties, redevelopment properties, consolidated joint venture properties, 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, 2013, 2012, and 2011.
	The following table details rental income and NOI from continuing and discontinued operations for UDR’s reportable segments for the years ended December 31, 2013, 2012, and 2011, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Reportable apartment home segment rental income
	Same-Store Communities
	West Region	$	232,374		$	219,988		$	204,570
	Mid-Atlantic Region	166,518			161,991			152,833
	Northeast Region	58,073			54,460			37,553
	Southeast Region	116,192			110,461			105,004
	Southwest Region	40,576			38,099			35,266
	Non-Mature Communities/Other	141,903			159,245			195,732
	Total segment and consolidated rental income	$	755,636		$	744,244		$	730,958
	Reportable apartment home segment NOI
	Same-Store Communities
	West Region	$	165,657		$	154,496		$	141,797
	Mid-Atlantic Region	115,805			112,699			105,213
	Northeast Region	42,353			39,376			27,181
	Southeast Region	75,825			71,218			66,202
	Southwest Region	24,869			22,817			20,319
	Non-Mature Communities/Other	89,532			103,594			124,048
	Total segment and consolidated NOI	514,041			504,200			484,760
	Reconciling items:
	Joint venture management and other fees	12,442			11,911			9,668
	Property management	(20,780		)	(20,465		)	(20,101		)
	Other operating expenses	(7,136		)	(5,718		)	(6,118		)
	Real estate depreciation and amortization	(341,490		)	(350,401		)	(370,343		)
	General and administrative	(42,238		)	(43,792		)	(47,257		)
	Hurricane-related recoveries/(charges), net	12,253			(8,495		)	—
	Other depreciation and amortization	(6,741		)	(4,105		)	(3,931		)
	Income/(loss) from unconsolidated entities	(415		)	(8,579		)	(6,352		)
	Interest expense	(126,083		)	(138,792		)	(156,366		)
	Interest and other income/(expense), net	4,681			2,703			5,688
	Tax benefit, net	7,299			30,282			5,647
	Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership	(1,530		)	(7,986		)	(395		)
	Net (income)/loss attributable to noncontrolling interests	60			(140		)	(167		)
	Net gain/(loss) on sale of depreciable property, net of impairment and tax	40,449			251,554			125,290
	Net income/(loss) attributable to UDR, Inc.	$	44,812		$	212,177		$	20,023
	The following table details the assets of UDR’s reportable segments as of December 31, 2013 and 2012 (dollars in thousands):
		December 31,			December 31,
		2013			2012
	Reportable apartment home segment assets:
	Same-Store communities:
	West Region	$	2,323,850		$	2,325,934
	Mid-Atlantic Region	1,431,590			1,419,873
	Northeast Region	738,805			723,437
	Southeast Region	889,753			887,483
	Southwest Region	350,158			346,449
	Non-mature Communities/Other	2,473,821			2,352,652
	Total segment assets	8,207,977			8,055,828
	Accumulated depreciation	(2,208,794		)	(1,924,682		)
	Total segment assets — net book value	5,999,183			6,131,146
	Reconciling items:
	Cash and cash equivalents	30,249			12,115
	Restricted cash	22,796			23,561
	Deferred financing costs, net	26,924			24,990
Notes receivable, net	83,033			64,006
Investment in and advances to unconsolidated joint ventures, net	507,655			477,631
Other assets	137,882			125,654
Total consolidated assets	$	6,807,722		$	6,859,103
Capital expenditures related to our Same-Store Communities totaled $50.4 million, $48.4 million, and $43.1 million for the years ended December 31, 2013, 2012, and 2011, respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $5.4 million, $6.7 million, and $14.7 million for the years ended December 31, 2013, 2012, and 2011, respectively.
Markets included in the above geographic segments are as follows:
i.	West Region — Orange County, San Francisco, Seattle, Monterey Peninsula, Los Angeles, San Diego, Inland Empire, and Portland
ii.	Mid-Atlantic Region — Metropolitan D.C., Richmond, Baltimore, Norfolk, and Other Mid-Atlantic
iii.	Northeast Region — New York and Boston
iv.	Southeast Region — Tampa, Orlando, Nashville, and Other Florida
v.	Southwest Region — Dallas and Austin

Hurricane_Related_Charges

Hurricane Related Charges	12 Months Ended
	Dec. 31, 2013
Hurricane Related Charges [Abstract]	'
Hurricane Related Charges	'
	HURRICANE-RELATED (RECOVERIES)/CHARGES
	In October 2012, Hurricane Sandy hit the East Coast, affecting three of the Company’s operating communities (1,706 apartment homes) located in New York City. The properties suffered some physical damage, and were closed to residents for a period following the hurricane. The Company has insurance policies that provide coverage for property damage and business interruption, subject to applicable retention.
	Based on the claims filed and management’s estimates, the Company recognized a $9.0 million impairment charge for the damaged assets’ net book value and incurred $10.4 million of repair and cleanup costs during the year ended December 31, 2012. The impairment charge and the repair and cleanup costs incurred were reduced as of December 31, 2012 by $14.5 million of estimated insurance recovery, and were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations. During the year ended December 31, 2013, no material adjustments to the impairment charge and the repair and cleanup costs incurred were recognized. With the exception of one of the properties that is under redevelopment at December 31, 2013, the rehabilitation of the remaining two properties was substantially completed as of December 31, 2013.
	As of December 31, 2013, the Company had settled the Hurricane Sandy claims and received insurance proceeds in excess of the $14.5 million estimated insurance recovery receivable related to the impairment charge and the repair and cleanup costs incurred. As a result, the Company recognized a Hurricane-related recovery of approximately $4.8 million and a casualty gain of approximately $654,000 for the year ended December 31, 2013. Both the recovery and casualty gain were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations.
	Based on the claims filed and management’s estimates, the Company recognized $4.4 million of business interruption losses for the year ended December 31, 2012, of which $3.6 million were related to rent concession rebates provided to residents during the period the properties were uninhabitable and were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations, and $767,000 were related to rent that was not contractually receivable and were classified as a reduction to Rental Income on the Consolidated Statements of Operations. As noted below, the Company recovered from the insurance carrier approximately $4.2 million of the $4.4 million of 2012 business interruption losses. The Company estimates that it incurred an additional $3.4 million of business interruption losses for the year ended December 31, 2013. As noted below, the Company recovered from the insurance carrier approximately $2.6 million of the $3.4 million of 2013 business interruption losses.
	During the year ended December 31, 2013, the Company received approximately $6.8 million of insurance proceeds for recovery of business interruption losses. Of the $6.8 million of insurance proceeds received in 2013, $4.2 million related to recovery of business interruption losses incurred in 2012 and the remaining $2.6 million related to recovery of business interruption losses incurred in 2013. The $6.8 million of recovery was classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations as of December 31, 2013.

Unaudited_Summarized_Consolida

Unaudited Summarized Consolidated Quarterly Financial Data	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 is summarized in the table below (dollars in thousands, except per share amounts):
			Three Months Ended
			March 31,			June 30,			September 30,			December 31,
	2013
	Rental income (a)		$	181,961		$	186,285		$	187,917		$	190,321
	Income/(loss) from continuing operations		(1,162		)	4,525			2,351			(3,374		)
	Income/(loss) from discontinued operations, net of tax		853			829			884			41,376
	Net income/(loss) attributable to common stockholders		(1,199		)	4,261			2,257			35,769
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	(0.00	)	$	0.02		$	0.01		$	0.14
	2012
	Rental income (a)		$	169,950		$	175,153		$	179,448		$	180,150
	Income/(loss) from continuing operations		915			(23,961		)	(9,287		)	(13,972		)
	Income/(loss) from discontinued operations, net of tax		85,713			180,268			(389		)	1,016
	Net income/(loss) attributable to common stockholders		80,848			145,721			(9,962		)	(13,231		)
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	0.37		$	0.62		$	(0.04	)	$	(0.05	)
	(a)	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
	(b)	Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.

Consolidation_and_Basis_of_Pre1

Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013, our consolidated apartment portfolio consisted of 141 consolidated communities located in 21 markets consisting of 41,250 apartment homes. In addition, the Company has an ownership interest in 9,909 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”). As of December 31, 2013 and 2012, there were 183,278,698 and 184,281,253 units, respectively, in the Operating Partnership outstanding, of which 173,959,774 units or 94.9% and 174,886,035 or 94.9%, respectively, were owned by UDR and 9,318,924 units or 5.1% and 9,395,218 or 5.1%, respectively, were owned by limited partners. The consolidated financial statements of UDR include the noncontrolling interests of the unitholders in the Operating 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 3, Real Estate Owned, and Note 6, Secured and Unsecured Debt.
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, 2013, 2012, and 2011, rental revenues of the Operating Partnership represented 54%, 54%, 53%, respectively, of the General Partner’s consolidated rental revenues (including those classified within discontinued operations). At December 31, 2013, the Operating Partnership’s apartment portfolio consisted of 68 communities located in 17 markets consisting of 20,746 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, 2013, there were 183,278,698 OP Units outstanding, of which 173,959,774 or 94.9% were owned by UDR and affiliated entities and 9,318,924 or 5.1% were owned by non-affiliated limited partners. There were 184,281,253 OP Units in the Operating Partnership outstanding as of December 31, 2012, of which 174,886,035 or 94.9% were owned by UDR and affiliated entities and 9,395,218 or 5.1% were owned by non-affiliated limited partners.
	As sole general partner of the Operating Partnership, UDR owned 110,883 general partnership interest units or 0.06% of the total OP Units outstanding as of December 31, 2013 and 2012. At December 31, 2013 and 2012, there were 183,167,815 and 184,170,370 OP Units outstanding of limited partnership interest, respectively, of which 1,751,671 were Class A Limited Partnership OP Units. UDR owned 173,848,891 or 94.9% and 174,775,152 or 94.9% at December 31, 2013 and 2012, respectively. The remaining 9,318,924 or 5.1% and 9,395,218 or 5.1% OP Units outstanding of limited partnership interest were held by non- affiliated partners at December 31, 2013 and 2012, respectively, of which 1,751,671 were Class A Limited Partnership units. See Note 9, 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_Policie1

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
SIGNIFICANT ACCOUNTING POLICIES	'
	SIGNIFICANT ACCOUNTING POLICIES
	Recent Accounting Pronouncements
	In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-10, Disclosures about Offsetting Assets and Liabilities. The objective of this update is to provide enhanced disclosures that will enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position. This included the effect or potential effect of rights of setoff associated with an entity’s recognized assets and recognized liabilities within the scope of this update. The amendments require enhanced disclosures by requiring improved information about financial instruments and derivative instruments that are either 1) offset on the balance sheet in accordance with the “Offsetting Guidance” in ASC 210-20-45 or ASC 815-10-45 (collectively, the offsetting guidance) or 2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether they are offset in accordance with the “Offsetting Guidance”. The amendments, which were adopted by the Company on January 1, 2013, impacted the Company’s disclosures related to its derivative activities. (See Note 13, Derivatives and Hedging Activity.) The new guidance did not have any impact on the Company’s consolidated financial position, results of operations, or cash flows.
	In February 2012, the FASB issued ASU No. 2013-02, Other Comprehensive Income (Topic 220) to require preparers to report, in one place, information about reclassifications out of accumulated other comprehensive income (“AOCI”). For significant items reclassified out of AOCI to net income in their entirety in the same reporting period, reporting (either on the face of the statement where net income is presented or in the notes thereto) is required about the effect of the reclassifications on the respective line items in the statement where net income is presented. For items that are not reclassified to net income in their entirety in the same reporting period, a cross reference to other existing disclosures is required in the notes. The amendments, which were adopted by the Company on January 1, 2013, did not have any impact on the Company's consolidated financial position, results of operations, or cash flows. The accompanying consolidated financial statements include the required disclosures in the Consolidated Statements of Comprehensive Income/(Loss) or in the notes thereto for each of the three years in the period ended December 31, 2013.
	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. As of December 31, 2013 and 2012, the amount of our net intangible assets, which are reflected in Other Assets in the Consolidated Balance Sheets, was $9.0 million and $11.9 million, respectively. As of December 31, 2013 and 2012, the amount of our net intangible liabilities, which are reflected in Accounts Payable, Accrued Expenses, and Other Liabilities in the Consolidated Balance Sheets, was $4.4 million and $5.2 million. The balances are being amortized over the remaining life of the respective intangible.
	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, 2013, 2012, and 2011 were $11.1 million, $10.0 million and $10.0 million, respectively. During the years ended December 31, 2013, 2012, and 2011, total interest capitalized was $29.4 million, $26.4 million, and $13.0 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, 2013 and 2012 (dollars in thousands):
		Interest rate at December 31, 2013		December 31, 2013		December 31, 2012
	Note due March 2014 (a)	3.67	%	$	40,800	$	—
	Note due October 2014 - related party (b)	—		—		24,481
	Note due February 2017 (c)	10	%	14,580		13,200
	Note due July 2017 (d)	8	%	1,400		100
	Note due June 2022 (net of discount of $247 and $275) (e)	7	%	26,253		26,225
	Total notes receivable, net			$	83,033	$	64,006
	(a) In conjunction with the sale of its 95% interest in the Lodge at Stoughton, one of its unconsolidated joint ventures, the Company provided the buyer with a $40.8 million three-month bridge loan at LIBOR plus a spread of 350 basis points with two three-month extension options at increased rates. For additional information on this transaction see Note 5, Joint Ventures and Partnerships.
	(b) As of December 31, 2012, the Company had a $24.5 million unsecured note receivable with one of its unconsolidated joint ventures. In December 2013, the outstanding balance was paid off in connection with the sale of the Company’s 95% interest in the joint venture. (See footnote (a) above and Note 5, Joint Ventures and Partnerships, for additional information on this transaction.)
	(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $14.6 million, which bears an interest rate of 10.00% per annum. During the year ended December 31, 2013, the Company loaned an additional $1.4 million under this note. 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).
	(d) 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. During the year ended December 31, 2013, the Company loaned an additional $1.3 million under the note. 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).
	(e) In 2012, the Company purchased mezzanine debt securing a mortgage on a class A community in West Los Angeles, California. The $26.5 million loan was purchased at a yield of 7.25% and bears a coupon rate of 7.00%. Interest payments are due monthly and the note is due June 2022. The discount is amortized using the effective interest method.
	During the years ended December 31, 2013, 2012 and 2011, the Company recognized $4.1 million, $2.7 million and $646,000 of interest income, net of accretion, from these notes receivable, of which $765,000, $281,000 and $0, respectively, were related party interest income. Interest income is included in Interest and Other Income/(Expense), Net on the Consolidated Statements of Operations.
	Marketable Securities
	During the year ended December 31, 2011, the Company sold marketable securities for $3.5 million, resulting in a realized gain of $3.1 million, which is included in Interest and Other Income/(Expense), Net on the Consolidated Statements of Operations. The cost of securities sold was based on the specific identification method. Unrealized gains of $3.5 million were reclassified out of accumulated other comprehensive income/(loss) into earnings during the year ended December 31, 2011. The marketable securities, which represented common stock in a publicly held company, were classified as “available-for-sale,” and were carried at fair value with unrealized gains and losses reported as a component of other comprehensive income/(loss).
	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 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, 2013, 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
	Interests in the Operating Partnership held by limited partners are represented by Operating Partnership units (“OP Units”). The income is allocated to holders of OP Units based upon net income available to common stockholders and the weighted average number of OP Units outstanding to total common shares plus OP 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 agreement.
	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 Amended and Restated Agreement of Limited Partnership of the Operating Partnership (the “Operating Partnership Agreement”), provided that such OP Units have been outstanding for at least one year. UDR, as the 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 the Company for each OP Unit), as defined in the Operating Partnership Agreement. 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”), primarily those engaged in development activities.
	Income taxes for our TRS, RE3, 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, 2013, UDR recorded a net income tax receivable of $1.3 million and a net deferred tax asset of $32.3 million (net of a valuation allowance of $1.3 million), which are classified in Other Assets on the Consolidated Balance Sheets.
	Prior to 2012, RE3 had a history of losses and, as a result, historically recognized a valuation allowance for net deferred tax assets.  Each quarter, the Company evaluates the need to retain all or a portion of the valuation allowance on its net deferred tax assets. In 2012, the Company determined that it was more likely than not that the deferred tax assets, including any remaining net operating loss carry forward, would be realized. In making this determination, the Company analyzed, among other things, its recent history of earnings from sales of depreciable property, forecasts of future earnings and its cumulative earnings for the last twelve quarters. The reversal of the valuation allowance resulted in an income tax benefit of $44.4 million during the year ended December 31, 2012, $21.5 million of which is reported in continuing operations and included within Tax Benefit, Net in the Consolidated Statements of Operations, and $22.9 million of which is included within Income/(Loss) from Discontinued Operations, Net of Tax in the Consolidated Statements of Operations.
	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 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 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, 2013. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2010 through 2012 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
	Under GAAP, the results of operations for those properties sold during the year or classified as held for sale at the end of the current year are 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 4, 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, 2013, 2012, and 2011, total advertising expense was $5.7 million, $6.2 million, and $5.4 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.
	Preferred Share Redemption and Repurchases
	During the year ended December 31, 2012, the Company completed the redemption of all outstanding shares of its 6.75% Series G Cumulative Redeemable Preferred Stock. A total of 3,264,362 shares of the Series G Preferred Stock was redeemed at a redemption price of $25 per share in cash, plus accrued and unpaid dividends to the redemption date for a total cost of $82.1 million.
When redeeming or repurchasing preferred stock, the Company recognizes share issuance costs as a charge to the preferred stock on a pro rata basis to the total costs incurred for the preferred stock as well as any premium or discount on the redemption or repurchase. In connection with the redemption of the Series G Preferred Stock, the Company recognized a (decrease)/increase in net income/(loss) attributable to common stockholders of $(2.8) million, and $(175,000) for the years ended December 31, 2012, and 2011, respectively, which is reported in Premium on Preferred Stock Redemption or Repurchases, Net on the Consolidated Statements of Operations.
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, 2013, 2012, and 2011, 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 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, 2013, 2012, and 2011 was $250,000, $80,000, and $(404,000), 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, 2013, 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 December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-10, Disclosures about Offsetting Assets and Liabilities. The objective of this update is to provide enhanced disclosures that will enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position. This included the effect or potential effect of rights of setoff associated with an entity’s recognized assets and recognized liabilities within the scope of this update. The amendments require enhanced disclosures by requiring improved information about financial instruments and derivative instruments that are either 1) offset on the balance sheet in accordance with the “Offsetting Guidance” in ASC 210-20-45 or ASC 815-10-45 (collectively, the offsetting guidance) or 2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether they are offset in accordance with the “Offsetting Guidance”. The amendments, which were adopted by the Operating Partnership on January 1, 2013, impacted the Operating Partnership’s disclosures related to its derivative activities. (See Note 8, Derivatives and Hedging Activity.) The new guidance did not have any impact on the Operating Partnership’s consolidated financial position, results of operations, or cash flows.
	In February 2012, the FASB issued ASU No. 2013-02, Other Comprehensive Income (Topic 220) to require preparers to report, in one place, information about reclassifications out of accumulated other comprehensive income (“AOCI”). For significant items reclassified out of AOCI to net income in their entirety in the same reporting period, reporting (either on the face of the statement where net income is presented or in the notes thereto) is required about the effect of the reclassifications on the respective line items in the statement where net income is presented. For items that are not reclassified to net income in their entirety in the same reporting period, a cross reference to other existing disclosures is required in the notes. The amendments, which were adopted by the Operating Partnership on January 1, 2013, did not have any impact on the Operating Partnership's consolidated financial position, results of operations, or cash flows. The accompanying consolidated financial statements include the required disclosures in the Consolidated Statements of Comprehensive Income/(Loss) or in the notes thereto for each of the three years in the period ended December 31, 2013.
	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. As of December 31, 2013 and 2012, the amount of our net intangible assets which are reflected in Other Assets was $7.6 million and $9.3 million, respectively. As of December 31, 2013 and 2012, the amount of our net intangible liabilities which are reflected in Accounts Payable, Accrued Expenses, and Other Liabilities was $3.5 million and $3.9 million in our Consolidated Balance Sheets. The balances are being amortized over the remaining life of the respective intangible.
	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, 2013, 2012, and 2011 were $2.5 million, $2.1 million, and $2.2 million, respectively. During the years ended December 31, 2013, 2012, and 2011, total interest capitalized was $5.9 million, $3.7 million, $1.8 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 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 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 (2010 through 2012) 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
	Under GAAP, the results of operations for those properties sold during the year or classified as held for sale at the end of the current year are 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 4, 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 6, 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, 2013, 2012, and 2011, total advertising expense from continuing and discontinued operations was $2.5 million, $2.4 million, and $2.5 million, respectively.
	Comprehensive Income/(Loss)
	Comprehensive income, 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, 2013, 2012, and 2011, 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 8, 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, 2013, the Operating Partnership held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; San Francisco, California; Metropolitan D.C.; and New York, New York markets.

Real_Estate_Owned_UNITED_DOMIN

Real Estate Owned (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013, the Company owned and consolidated 141 communities in 10 states plus the District of Columbia totaling 41,250 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Land	$	1,847,127		$	1,884,403
	Depreciable property — held and used:
	Building, improvements, and furniture, fixtures and equipment	5,876,717			5,591,368
	Under development:
	Land	110,769			151,154
	Construction in progress	356,644			339,894
	Real estate sold or held for sale:
	Land	10,751			22,766
	Building, improvements, and furniture, fixtures and equipment	5,969			66,243
	Real estate owned	8,207,977			8,055,828
	Accumulated depreciation	(2,208,794		)	(1,924,682		)
	Real estate owned, net	$	5,999,183		$	6,131,146
	In June 2013, the Company sold a 50% interest in five partnerships (the “UDR/MetLife Vitruvian Park® Partnerships”) to MetLife for approximately $141.3 million, before transaction costs of $936,000. The properties held by the UDR/MetLife Vitruvian Park® Partnerships are located in Addison, Texas and consist of two operating communities with 739 apartment homes, one recently completed development community in lease-up with 391 apartment homes, and 28.4 acres of developable land parcels. The transaction resulted in a gain of approximately $436,000 which the Company has deferred until the terms of the construction completion guarantee have been met. The UDR/MetLife Vitruvian Park® Partnerships 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 operations of the UDR/MetLife Vitruvian Park® Partnerships' assets, prior to the sale of a 50% interest, have been classified as a component of continuing operations on the Consolidated Statements of Operations, as UDR has continuing involvement over the duration of the partnership.
	In December 2013, the Company sold a 49% interest to MetLife in the Company’s fully-entitled 399 Fremont land parcel located in San Francisco, California for approximately $29.9 million. In conjunction with the sale, the Company formed a new unconsolidated joint venture, UDR/MetLife 399 Fremont, to develop a $318 million, 447-home, luxury high-rise tower on the site. As the Company recently acquired the 399 Fremont land parcel, the sale price was equivalent to the cost basis resulting in no gain or loss on the transaction. For more information on this transaction see Note 5, Joint Ventures and Partnerships.
	In December 2013, the Company became the managing partner of two joint ventures resulting in consolidation of both and increasing the real estate owned by $129.4 million. See Note 5, Joint Ventures and Partnerships, for further details.
	In January 2014, the Company acquired a fully-entitled land parcel for future development located in Huntington Beach, California for $78.0 million.
	In 2012, the Company acquired the remaining 80% ownership interests in two apartment communities (633 homes) for $11.7 million from one of our joint ventures. Also the Company acquired our partners’ interests in two development joint ventures and two joint ventures, which owned parcels of land for future development. Total acquisition value of these communities and land parcels at the acquisition date was recorded as $102.1 million to land; $38.8 million to buildings, improvements and furniture, fixtures, and equipment; $1.5 million to intangible assets; and $38.1 million to assumed debt and liabilities.
	The Company incurred $59,000, $2.3 million and $4.8 million of acquisition-related costs during the years ended December 31, 2013, 2012, and 2011, respectively. These expenses are reported within the line item General and Administrative on the Consolidated Statements of Operations.
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, 2013, the Operating Partnership owned and consolidated 68 communities in nine states plus the District of Columbia totaling 20,746 apartment homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Land	$	1,004,447		$	994,709
	Depreciable property — held and used:
	Buildings, improvements, and furniture, fixtures and equipment	3,103,970			3,030,883
	Real estate sold:
	Land	—			12,015
	Buildings, improvements, and furniture, fixtures and equipment	—			57,921
	Under development:
	Land	9,447			25,833
	Construction in progress	70,616			61,559
	Real estate owned	4,188,480			4,182,920
	Accumulated depreciation	(1,241,574		)	(1,097,133		)
	Real estate owned, net	$	2,946,906		$	3,085,787
	The Operating Partnership had no acquisitions during the years ended December 31, 2013, 2012 and 2011.
	In November 2013, the Operating Partnership distributed the development property Los Alisos to the General Partner. See Note 6, Related Party Transactions, for more details.

Discontinued_Operations_UNITED

Discontinued Operations (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
DISCONTINUED OPERATIONS	'
	DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE
	The results of operations for properties sold during the year or designated as held for sale at the end of the year are classified as discontinued operations for all periods presented. 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. The presentation of discontinued operations does not have an impact on net income/(loss) attributable to common stockholders, and results in the reclassification of the operating results of all properties sold or classified as held for sale through December 31, 2013, within the Consolidated Statements of Operations for the years ended December 31, 2013, 2012, and 2011, and the reclassification of the assets and liabilities within the Consolidated Balance Sheets as of December 31, 2013 and 2012, if applicable. The gain/(loss) on the sale of depreciable properties, net of tax and the income/(loss) attributable to disposed properties are reported within the line item Income/(Loss) from Discontinued Operations, Net of Tax on the Consolidated Statements of Operations.
	During the year ended December 31, 2013, the Company sold two communities in the Sacramento market with 914 apartment homes for gross proceeds of $81.1 million. During the year ended December 31, 2012, the Company sold 21 communities with 6,507 apartment homes for gross proceeds of $609.4 million. During the year ended December 31, 2011, the Company sold 18 communities with 4,488 apartment homes, which included six communities with 1,418 apartment homes sold in conjunction with an asset exchange, for gross proceeds of $593.4 million.
	The Company had one commercial operating property under contract to sell for approximately $10.8 million that met the criteria to be classified as held for sale and included in Income/(Loss) from Discontinued Operations, Net of Tax on the Consolidated Statements of Operations at December 31, 2013. In December 2013, the Company recognized an impairment loss of $1.5 million, net of tax, on this property under a Level 3 assessment as the purchase price less estimated cost of sale was less than the carrying value.
	During the years ended December 31, 2013, 2012, and 2011, UDR recognized net gain/(loss) on the sale of depreciable properties, before tax of $41.9 million, $260.4 million, and $138.5 million, respectively, which are included in Income/(Loss) from Discontinued Operations, Net of Tax on the Consolidated Statements of Operations.
	The following is a summary of income/(loss) from discontinued operations, net of tax for the years ended December 31, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Rental income	$	9,152		$	39,543		$	117,269
	Rental expenses	3,511			14,106			44,100
	Property management	252			1,087			3,226
	Real estate depreciation	1,958			8,475			45,713
	Interest and other (income)/expense, net	(62		)	821			2,066
	Income/(loss) attributable to disposed properties and assets held for sale	3,493			15,054			22,164
	Net gain/(loss) on the sale of depreciable property	41,919			260,404			138,508
	Impairment charges	(2,355		)	—			—
	Income tax benefit/(expense)	885			(8,850		)	(13,218		)
	Income/(loss) from discontinued operations, net of tax	$	43,942		$	266,608		$	147,454
	Income/(loss) from discontinued operations attributable to UDR, Inc.	$	42,364		$	256,533		$	142,122
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
DISCONTINUED OPERATIONS	'
	DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE
	The results of operations for properties sold during the year or designated as held for sale at the end of the year are classified as discontinued operations for all periods presented. 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. The presentation of discontinued operations does not have an impact on net income/(loss) attributable to OP unitholders, and results in the reclassification of the operating results of all properties sold or classified as held for sale through December 31, 2013 within the Consolidated Statements of Operations for the years ended December 31, 2013, 2012, and 2011, and the reclassification of the assets and liabilities within the Consolidated Balance Sheets as of December 31, 2013 and 2012, if applicable. The gain/(loss) on the sale of the depreciable properties and the income/(loss) attributable to disposed properties are reported within the line item Income/(Loss) from Discontinued Operations on the Consolidated Statements of Operations.
	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. During the year ended December 31, 2012, the Operating Partnership sold four communities with 1,314 apartment homes. During the year ended December 31, 2011, the Operating Partnership sold eight communities with 2,024 apartment homes, which included four communities with 984 apartment homes sold in conjunction with an asset exchange. At December 31, 2013 and 2012, 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, 2013, 2012, and 2011, the Operating Partnership recognized net gain/(loss) on the sale of depreciable properties of $41.5 million, $51.1 million, and $60.1 million, respectively, which is included 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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Rental income	$	8,989		$	15,745		$	42,120
	Rental expenses	3,149			5,444			15,734
	Property management	247			432			1,160
	Real estate depreciation	1,935			3,320			13,503
	Interest	—			—			815
	Income/(loss) attributable to disposed properties	3,658			6,549			10,908
	Net gain/(loss) on the sale of depreciable properties	41,518			51,094			60,065
	Income/(loss) from discontinued operations	$	45,176		$	57,643		$	70,973

Debt_UNITED_DOMINION_REALTY_LP

Debt (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
DEBT	'
	SECURED AND UNSECURED DEBT
	The following is a summary of our secured and unsecured debt at December 31, 2013 and 2012 (dollars in thousands):
		Principal Outstanding						For the Year Ended December 31, 2013
								Weighted Average			Weighted Average			Number of Communities
		December 31,						Interest Rate			Years to Maturity			Encumbered
		2013			2012
	Secured Debt:
	Fixed Rate Debt
	Mortgage notes payable (a)	$	445,706		$	455,533		5.44	%		2.5			8
	Fannie Mae credit facilities (b)	626,667			631,078			4.99	%		5			22
	Total fixed rate secured debt	1,072,373			1,086,611			5.18	%		4			30
	Variable Rate Debt
	Mortgage notes payable	63,595			37,415			2.34	%		2.1			2
	Tax-exempt secured notes payable (c)	94,700			94,700			0.84	%		9.2			2
	Fannie Mae credit facilities (b)	211,409			211,409			1.61	%		6.5			7
	Total variable rate secured debt	369,704			343,524			1.54	%		6.5			11
	Total Secured Debt	1,442,077			1,430,135			4.24	%		4.6			41
	Unsecured Debt:
	Commercial Banks
	Borrowings outstanding under an unsecured credit facility due December 2017 (d), (i)	—			76,000			—			3.9
	Senior Unsecured Notes
	3.70% Medium-Term Notes due October 2020 (net of discount of $54) (g), (i)	299,946			—			3.7	%		6.8
	4.63% Medium-Term Notes due January 2022 (net of discount of $2,882 and $3,241) (i)	397,118			396,759			4.63	%		8
	1.42% Term Notes due June 2018 (e), (i)	35,000			35,000			1.42	%		4.4
	2.50% Term Notes due June 2018 (e), (i)	65,000			65,000			2.5	%		4.4
	6.05% Medium-Term Notes due June 2013	—			122,500			—			—
	5.13% Medium-Term Notes due January 2014 (h)	184,000			184,000			5.13	%		0
	5.50% Medium-Term Notes due April 2014 (net of discount of $20 and $89)	128,480			128,411			5.5	%		0.3
	5.25% Medium-Term Notes due January 2015 (net of discount of $134 and $262)	325,041			324,913			5.25	%		1
	5.25% Medium-Term Notes due January 2016	83,260			83,260			5.25	%		2
	2.73% Term Notes due June 2018 (f) (i)	250,000			250,000			2.73	%		4.4
	8.50% Debentures due September 2024	15,644			15,644			8.5	%		10.7
	4.25% Medium-Term Notes due June 2018 (net of discount of $1,893 and $2,322) (i)	298,107			297,678			4.25	%		4.4
	Other	30			33			N/A			N/A
	Total Unsecured Debt	2,081,626			1,979,198			4.35	%		4.2
	Total Debt	$	3,523,703		$	3,409,333		4.31	%		4.4
	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 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. As of December 31, 2013, secured debt encumbered $2.3 billion or 28.2% of UDR’s total real estate owned based upon gross book value ($5.9 billion or 71.8% of UDR’s real estate owned based on gross book value is unencumbered).
	(a) At December 31, 2013, fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from December 2014 through May 2019 and carry interest rates ranging from 3.43% to 5.94%.
	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. During the years ended December 31, 2013, 2012, and 2011, the Company had $5.1 million, $4.9 million, and $3.5 million of amortization expense on the fair market adjustment of debt assumed in acquisition of properties, respectively, which was included in Interest Expense on the Consolidated Statements of Operations. The unamortized fair market adjustment was a net premium of $11.8 million and $16.9 million at December 31, 2013 and 2012, respectively.
	(b) UDR has three secured credit facilities with Fannie Mae with an aggregate commitment of $838.1 million at December 31, 2013. 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, 2013, we have $626.7 million of the outstanding balance fixed at a weighted average interest rate of 4.99% and the remaining balance of $211.4 million on these facilities is currently at a weighted average variable interest rate of 1.61%.
	On June 28, 2013, the Company refinanced $186 million of a Fannie Mae credit facility that carried an interest rate equal to LIBOR plus a spread of 284 basis points and was scheduled to mature in 2019. The new loans include a $90 million, 7-year fixed-rate loan that carries an interest rate of 3.95% and a $96 million, 10-year variable-rate loan that carries an interest rate equal to LIBOR plus a spread of 190 basis points. Three of the Company's communities were released from the facility and added to the Company's unencumbered asset pool in connection with the refinancing.
	Further information related to these credit facilities is as follows (dollars in thousands):
		December 31, 2013			31-Dec-12
	Borrowings outstanding	$	838,076		$	842,487
	Weighted average borrowings during the period ended	839,597			903,817
	Maximum daily borrowings during the period ended	841,494			1,054,735
	Weighted average interest rate during the period ended	4.2		%	4.3		%
	Weighted average interest rate at the end of the period	4.1		%	4.4		%
	(c) The variable rate mortgage notes payable that secure tax-exempt housing bond issues mature on August 2019 and March 2032, respectively. Interest on these notes is payable in monthly installments. The variable mortgage notes have interest rates of 0.79% and 0.95%, respectively as of December 31, 2013.
	(d) The Company has a $900 million unsecured revolving credit facility. In June 2013, the Company amended its unsecured revolving credit facility. The amendment extended the maturity date to December 2017, includes a six month extension option, and contains an accordion feature that allows the Company to increase the facility to $1.45 billion. Based on the Company's current credit rating, the credit facility carries an interest rate equal to LIBOR plus a spread of 110 basis points and a facility fee of 20 basis points. In the third quarter of 2013, the Company paid off the balance outstanding under the revolving credit facility. As of December 31, 2013, the Company had no balance outstanding under the revolving credit facility.
	The following is a summary of short-term bank borrowings under UDR’s bank credit facility at December 31, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Total revolving credit facility	$	900,000		$	900,000
	Borrowings outstanding at end of period (1)	—			76,000
	Weighted average daily borrowings during the period ended	169,844			167,038
	Maximum daily borrowings during the period ended	372,000			788,000
	Weighted average interest rate during the period ended	1.2		%	1.5		%
	Interest rate at end of the period	1.3		%	1.4		%
	(1) Excludes $2.2 million and $3.9 million of letters of credit at December 31, 2013 and 2012, respectively.
	(e) In June 2013, the Company amended and re-priced its $100 million unsecured term notes due in January 2016. The loan was re-priced from LIBOR plus 142.5 basis points to LIBOR plus 125 basis points, and the maturity date was extended to June 2018.
	(f) In June 2013, the Company amended and re-priced its $250 million unsecured term notes due in January 2016. The loan was re-priced from LIBOR plus 142.5 basis points to LIBOR plus 125 basis points, and the maturity date was extended to June 2018.
	(g) On September 26, 2013, the Company issued $300 million of 3.70% senior unsecured medium-term notes due October 2020. Interest is payable semiannually beginning in April 2014. The notes were priced at 99.981% of the principal amount at issuance and had a discount of $54,000 at December 31, 2013. We used the net proceeds to repay the borrowings outstanding on our $900 million unsecured credit facility and for general corporate purposes. The notes are fully and unconditionally guaranteed by the Operating Partnership.
	(h) In January 2014, we paid off $184 million of 5.13% medium-term notes due January 2014 with the borrowings under the Company’s $900 million unsecured revolving credit facility.
(i) The Operating Partnership is a guarantor at December 31, 2013 and 2012.
The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next five years subsequent to December 31, 2013 are as follows (dollars in thousands):
Year		Total Fixed Secured Debt			Total Variable Secured Debt			Total Secured Debt				Total Unsecured Debt (a)			Total Debt
2014		$	48,035		$	—		$	48,035			$	311,574		$	359,609
2015		197,210			—			197,210				324,382			521,592
2016		136,431			63,595			200,026				82,478			282,504
2017		178,398			65,000			243,398				—			243,398
2018		176,483			50,000			226,483				648,646			875,129
Thereafter		335,816			191,109			526,925				714,546			1,241,471
Total		$	1,072,373		$	369,704		$	1,442,077			$	2,081,626		$	3,523,703
(a) With the exception of the 1.42% Term Notes due June 2018 and revolving credit facility which carry a variable interest rate, all unsecured debt carries fixed interest rates.
We were in compliance with the covenants of our debt instruments at December 31, 2013.
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
DEBT	'
	DEBT
	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, 2013 and 2012 (dollars in thousands):
		Principal Outstanding						For the Year Ended December 31, 2013
		December 31,						Weighted Average			Weighted Average			Number of Communities
		2013			2012			Interest Rate			Years to Maturity			Encumbered
	Fixed Rate Debt
	Mortgage notes payable	$	386,803		$	394,999		5.44	%		2.6			5
	Fannie Mae credit facilities	379,003			370,638			4.71	%		5.5			10
	Total fixed rate secured debt	765,806			765,637			5.08	%		4			15
	Variable Rate Debt
	Mortgage notes payable	—			37,415			—			—			—
	Tax-exempt secured note payable	27,000			27,000			0.95	%		18.2			1
	Fannie Mae credit facilities	142,059			137,187			1.9	%		7.7			5
	Total variable rate secured debt	169,059			201,602			1.75	%		9.4			6
	Total secured debt	$	934,865		$	967,239		4.47	%		5			21
	As of December 31, 2013, the General Partner had secured credit facilities with Fannie Mae with an aggregate commitment of $838.1 million with $838.1 million outstanding. 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, 2013, $626.7 million of the outstanding balance was fixed at a weighted average interest rate of 4.99% and the remaining balance of $211.4 million on these facilities had a weighted average variable interest rate of 1.61%. During 2013, the General Partner reallocated an additional $13.7 million of the Fannie Mae credit facilities to the Operating Partnership. At December 31, 2013, there was a total of $521.1 million of these credit facilities allocated to the Operating Partnership based on the ownership of the assets securing the debt. The following is information related to the credit facilities allocated to the Operating Partnership:
		December 31, 2013			December 31, 2012
		(dollars in thousands)
	Borrowings outstanding	$	521,062		$	507,825
	Weighted average borrowings during the period ended	522,007			544,793
	Maximum daily borrowings during the period ended	523,187			635,762
	Weighted average interest rate during the period ended	4.2		%	4.3		%
	Interest rate at the end of the period	4.1		%	4.4		%
	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 $10.0 million and $13.8 million at December 31, 2013 and 2012, respectively.
	Fixed Rate Debt
	Mortgage notes payable. Fixed rate mortgage notes payable are generally due in monthly installments of principal and interest and mature at various dates from December 2015 through May 2019 and carry interest rates ranging from 3.43% to 5.94%.
	Secured credit facilities. At December 31, 2013, the General Partner had borrowings against its fixed rate facilities of $626.7 million, of which $379.0 million was allocated to the Operating Partnership based on the ownership of the assets securing the debt. As of December 31, 2013, the fixed rate Fannie Mae credit facilities allocated to the Operating Partnership had a weighted average fixed interest rate of 4.71%.
	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 0.95% as of December 31, 2013.
	Secured credit facilities. At December 31, 2013, the General Partner had borrowings against its variable rate facilities of $211.4 million, of which $142.1 million was allocated to the Operating Partnership based on the ownership of the assets securing the debt. As of December 31, 2013, 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 five calendar years subsequent to December 31, 2013 are as follows (dollars in thousands):
		Fixed						Variable
		Mortgage			Credit			Tax Exempt				Credit			Total
		Notes			Facilities			Notes Payable				Facilities
	2014	$	8,590		$	344		$	—			$	—		$	8,934
	2015	192,939			364			—				—			193,303
	2016	131,957			382			—				—			132,339
	2017	1,641			15,684			—				6,566			23,891
	2018	1,696			161,754			—				46,272			209,722
	Thereafter	49,980			200,475			27,000				89,221			366,676
	Total	$	386,803		$	379,003		$	27,000			$	142,059		$	934,865
	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 $900 million, $250 million of term notes due June 2018, $100 million of term notes due June 2018, $300 million of medium-term notes due June 2018, $300 million of medium-term notes due October 2020, and $400 million of medium-term notes due January 2022. As of December 31, 2013, there were no outstanding borrowings under the unsecured credit facility. As of December 31, 2012, the outstanding balance under the unsecured credit facility was $76.0 million.

Related_Party_Transactions_UNI

Related Party Transactions (UNITED DOMINION REALTY, L.P.) (United Dominion Reality L.P.)	12 Months Ended
	Dec. 31, 2013
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
RELATED PARTY TRANSACTIONS	'
	RELATED PARTY TRANSACTIONS
	Payable/(Receivable) Due 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 receivable balances of $9.9 million and $11.1 million at December 31, 2013 and 2012, respectively, which is reflected as a 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, 2013, 2012, and 2011, the general and administrative expenses allocated to the Operating Partnership by UDR were $23.5 million, $25.2 million, and $32.6 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, 2013, 2012, and 2011, the Operating Partnership incurred $12.3 million, $11.9 million, and $3.7 million, respectively, of related party management fees related to a management agreement entered into in 2011 with wholly-owned subsidiaries of RE3. (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 Taxable REIT subsidiary (“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 RE3. 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 0.932% for the years ended December 31, 2013 and 2012, 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, 2013 and 2012, the note payable due to the General Partner was $83.2 million, respectively.
	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 5.337%. Interest payments are due monthly and the note matures on August 31, 2021. At December 31, 2013 and 2012, the note payable due to the General Partner was $5.5 million.
	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 and reduced its receivable from the General Partner by $53.7 million, resulting in a net capital reduction of $77.0 million.

Fair_Value_of_Derivatives_and_1

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 are summarized as follows (dollars in thousands):
						Fair Value at December 31, 2013, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2013		Fair Value Estimate at December 31, 2013		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs
						Assets or		Inputs		(Level 3)
						Liabilities		(Level 2)
						(Level 1)
	Description:
	Notes receivable (a)	$	83,033	$	83,833	$	—	$	—	$	83,833
	Total assets	$	83,033	$	83,833	$	—	$	—	$	83,833
	Derivatives - Interest rate contracts (b)	$	4,965	$	4,965	$	—	$	4,965	$	—
	Secured debt instruments - fixed rate: (c)
	Mortgage notes payable	445,706		466,375		—		—		466,375
	Fannie Mae credit facilities	626,667		661,094		—		—		661,094
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	63,595		63,595		—		—		63,595
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments (c):
	Senior unsecured notes	2,081,626		2,149,003		—		—		2,149,003
	Total liabilities	$	3,528,668	$	3,651,141	$	—	$	4,965	$	3,646,176
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	217,597	$	217,597	$	—	$	217,597	$	—
						Fair Value at December 31, 2012, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2012		Fair Value Estimate at December 31, 2012		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs (Level 3)
						Assets or		Inputs (Level 2)
						Liabilities (Level 1)
	Description:
	Notes receivable (a)	$	64,006	$	64,930	$	—	$	—	64,930
	Derivatives- Interest rate contracts (b)	2		2		—		2		—
	Total assets	$	64,008	$	64,932	$	—	$	2	$	64,930
	Derivatives- Interest rate contracts (b)	$	11,022	$	11,022	$	—	$	11,022	$	—
	Secured debt instruments- fixed rate: (c)
	Mortgage notes payable	455,533		494,728		—		—		494,728
	Fannie Mae credit facilities	631,078		689,295		—		—		689,295
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	37,415		37,415		—		—		37,415
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments: (c)
	Commercial bank	76,000		76,000		—		—		76,000
	Senior unsecured notes	1,903,198		2,039,736		—		—		2,039,736
	Total liabilities	$	3,420,355	$	3,654,305	$	—	$	11,022	$	3,643,283
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	223,418	$	223,418	$	—	$	223,418	$	—
	(a)	See Note 2, Significant Accounting Policies.
	(b)	See Note 13, Derivatives and Hedging Activity.
	(c)	See Note 6, Secured Debt and Unsecured Debt.
	(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, 2013 and 2012, 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 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 are classified as Level 2.
	Financial Instruments Not Carried at Fair Value
	At December 31, 2013, 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, 2013 and 2012, respectively.
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, 2013 and 2012 are summarized as follows (dollars in thousands):
						Fair Value at December 31, 2013, Using
		Total Carrying Amount in Statement of Financial Position at		Fair Value Estimate at		Quoted Prices in		Significant Other		Significant
						Active Markets		Observable		Unobservable
						for Identical		Inputs		Inputs
						Assets or		(Level 2)		(Level 3)
						Liabilities
		December 31, 2013		December 31, 2013		(Level 1)
	Description:
	Derivatives - Interest rate contracts (a)	$	2,731	$	2,731	$	—	$	2,731	$	—
	Secured debt instruments - fixed rate: (b)
	Mortgage notes payable	386,803		403,695		—		—		403,695
	Fannie Mae credit facilities	379,003		394,239		—		—		394,239
	Secured debt instruments - variable rate: (b)
	Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
	Fannie Mae credit facilities	142,059		142,059		—		—		142,059
	Total liabilities	$	937,596	$	969,724	$	—	$	2,731	$	966,993
						Fair Value at December 31, 2012, Using
		Total Carrying Amount in Statement of Financial Position at		Fair Value Estimate at		Quoted Prices in		Significant Other		Significant
						Active Markets		Observable		Unobservable
						for Identical		Inputs		Inputs
						Assets or		(Level 2)		(Level 3)
						Liabilities
		December 31, 2012		December 31, 2012		(Level 1)
	Description:
	Derivatives- Interest rate contracts (a)	$	2	$	2	$	—	$	2	$	—
	Total assets	$	2	$	2	$	—	$	2	$	—
	Derivatives- Interest rate contracts (a)	$	4,750	$	4,750	$	—	$	4,750	$	—
	Secured debt instruments- fixed rate: (b)
	Mortgage notes payable	394,999		429,973		—		—		429,973
	Fannie Mae credit facilities	370,638		399,389		—		—		399,389
	Secured debt instruments- variable rate: (b)
	Mortgage notes payable	37,415		37,415		—		—		37,415
	Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
	Fannie Mae credit facilities	137,187		137,187		—		—		137,187
	Total liabilities	$	971,989	$	1,035,714	$	—	$	4,750	$	1,030,964
	(a)	See Note 8, Derivatives and Hedging Activity.
	(b)	See Note 5, Debt.
	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, 2013 and December 31, 2012, 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, 2013, 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_Activi1

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the years ended December 31, 2013, 2012, and 2011, the Company recorded less than a  $1,000 loss from ineffectiveness in earnings attributable to reset date and index mismatches between the derivative and the hedged item, and the fair value of interest rate swaps that were not zero at inception of the hedging relationship. During the year ended December 31, 2011, the Company reclassified a $58,000 loss from Other Comprehensive Income/(Loss) to earnings due to forecasted transactions that were no longer probable of occurring, which was the result of the sale of an operating apartment community.
	Amounts reported in Accumulated Other Comprehensive Income/(Loss), Net in the Consolidated Balance Sheets related to derivatives will be reclassified to interest expense as interest payments are made on the Company’s variable-rate debt. Through December 31, 2014, the Company estimates that an additional $4.4 million will be reclassified as an increase to interest expense.
	As of December 31, 2013, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):
	Interest Rate Derivative		Number of Instruments		Notional
	Interest rate swaps		11		$	419,787
	Interest rate caps		5		$	274,291
	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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a gain/(loss) of $271,000, $290,000, and $(23,000) for the years ended December 31, 2013, 2012, and 2011, respectively.
	As of December 31, 2013, 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		2		$	155,197
	Tabular Disclosure of Fair Values of Derivative Instruments on the 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, 2013 and 2012 (dollars in thousands):
		Asset Derivatives										Liability Derivatives
				Fair Value at:										Fair Value at:
		Balance		December 31,				December 31,				Balance		December 31,				December 31,
		Sheet Location		2013				2012				Sheet Location		2013				2012
	Derivatives designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	2			Other liabilities		$	4,965			$	11,022
	Total			$	—			$	2					$	4,965			$	11,022
	Derivatives not designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	—			Other liabilities		$	—			$	—
	Total			$	—			$	—					$	—			$	—
	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, 2013, 2012, and 2011 (dollars in thousands):
			Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)												Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)											Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Derivatives in Cash Flow Hedging Relationships		2013				2012				2011						2013				2012				2011				2013		2012		2011
	Interest rate products		$	(469	)		$	(4,924	)		$	(16,477	)		Interest expense		$	(6,851	)		$	(7,649	)		$	(9,132	)	Interest expense	$	—	$	—	$	(58	)
	Total		$	(469	)		$	(4,924	)		$	(16,477	)				$	(6,851	)		$	(7,649	)		$	(9,132	)		$	—	$	—	$	(58	)
	Derivatives Not Designated as Hedging Instruments		Location of Gain or (Loss) Recognized in Income on Derivative		Amount of Gain or (Loss) Recognized in Income on Derivative
					2013				2012				2011
	Interest rate products		Interest and other income/(expense), net		$	271			$	290			$	(23	)
	Total				$	271			$	290			$	(23	)
	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, 2013 and 2012, 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, 2013, 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 $5.5 million. If the Company had breached any of these provisions at December 31, 2013, it would have been required to settle its obligations under the agreements at their termination value of $5.5 million.
	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, 2013 and December 31, 2012:
	Offsetting of Derivative Assets
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Assets				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)				Financial Instruments				Cash Collateral Received				Net Amount
	December 31, 2013		$	—			$	—			$	—			$	—			$	—			$	—
	December 31, 2012		$	2			$	—			$	2			$	—			$	—			$	2
	(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.
	Offsetting of Derivative Liabilities
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)				Financial Instruments				Cash Collateral Posted				Net Amount
	December 31, 2013		$	4,965			$	—			$	4,965			$	—			$	—			$	4,965
	December 31, 2012		$	11,022			$	—			$	11,022			$	—			$	—			$	11,022
	(b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” 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 5, Debt.)
	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, 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, 2013, 2012, and 2011, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in fair value of the derivatives is recognized directly in earnings. During the years ended December 31, 2013, 2012, and 2011, the Operating Partnership recorded less than $1,000 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, Net related to derivatives will be reclassified to interest expense as interest payments are made on the General Partner’s variable-rate debt that is allocated to the Operating Partnership. During the next twelve months through December 31, 2014, we estimate that an additional $2.2 million will be reclassified as an increase to interest expense.
	As of December 31, 2013, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):
	Interest Rate Derivative		Number of Instruments		Notional
	Interest rate swaps		2		$	96,974
	Interest rate caps		5		$	255,561
	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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in losses of $9,000, $9,000, and $204,000 for the years ended December 31, 2013, 2012, and 2011, respectively.
	As of December 31, 2013, 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		1		$	83,289
	Tabular Disclosure of Fair Values of Derivative Instruments on the 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, 2013 and 2012 (dollars in thousands):
		Asset Derivatives										Liability Derivatives
				Fair Value at:										Fair Value at:
		Balance		December 31,				December 31,				Balance		December 31,				December 31,
		Sheet Location		2013				2012				Sheet Location		2013				2012
	Derivatives designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	2			Other liabilities		$	2,731			$	4,750
	Total			$	—			$	2					$	2,731			$	4,750
	Derivatives not designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	—			Other liabilities		$	—			$	—
	Total			$	—			$	—					$	—			$	—
	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, 2013, 2012, and 2011 (dollars in thousands):
			Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)									Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	Derivatives in Cash Flow Hedging Relationships													Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
			2013				2012				2011			2013				2012				2011
	Interest rate products		$	(348	)		$	(1,898	)		($6,119)	Interest expense		$	(2,652	)		$	(3,431	)		$	(4,719	)
	Total		$	(348	)		$	(1,898	)		($6,119)			$	(2,652	)		$	(3,431	)		$	(4,719	)
		Derivatives Not Designated as Hedging Instruments		Location of Gain or (Loss) Recognized in Income on Derivative		Amount of Gain or (Loss) Recognized in Income on Derivative
						2013				2012				2011
		Interest rate products		Other operating expenses		$	(9	)		$	(9	)		$	(204	)
		Total				$	(9	)		$	(9	)		$	(204	)
	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, 2013 and 2012, 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, 2013, 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 $2.9 million. If the General Partner had breached any of these provisions at December 31, 2013, it would have been required to settle its obligations under the agreements at their termination value of $2.9 million.
	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, 2013 and December 31, 2012:
	Offsetting of Derivative Assets
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Assets				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)				Financial Instruments				Cash Collateral Received				Net Amount
	December 31, 2013		$	—			$	—			$	—			$	—			$	—			$	—
	December 31, 2012		$	2			$	—			$	2			$	—			$	—			$	2
	(a) Amounts reconcile to the aggregate fair value of derivative assets in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.
	Offsetting of Derivative Liabilities
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)				Financial Instruments				Cash Collateral Posted				Net Amount
	December 31, 2013		$	2,731			$	—			$	2,731			$	—			$	—			$	2,731
	December 31, 2012		$	4,750			$	—			$	4,750			$	—			$	—			$	4,750
	(b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.

Capital_Structure_UNITED_DOMIN

Capital Structure (UNITED DOMINION REALTY, L.P.) (United Dominion Reality L.P.)	12 Months Ended
	Dec. 31, 2013
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 Partnership Units. There were 110,883 General Partnership units outstanding at December 31, 2013 and 2012, all of which were held by UDR.
	Limited Partnership Units
	At December 31, 2013 and 2012, there were 183,167,815 and 184,170,370 limited partnership units outstanding, respectively, of which 1,751,671 were Class A Limited Partnership Units. UDR owned 173,848,891 or 94.9% and 174,775,152 or 94.9% at December 31, 2013 and 2012, respectively. The remaining 9,318,924 or 5.1% and 9,395,218 or 5.1% OP Units outstanding were held by non-affiliated partners at December 31, 2013 and 2012, respectively, of which 1,751,671 were Class A Limited Partnership Units.
	Subject to 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 $217.6 million and $223.4 million as of December 31, 2013 and December 31, 2012, 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 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 Partnership Unit.
	Holders of the Class A Partnership Units exclusively possess certain voting rights. The Operating Partnership may not do the following without approval of the holders of the Class A Partnership Units: (i) increase the authorized or issued amount of Class A Partnership Units, (ii) reclassify any other partnership interest into Class A Partnership Units, (iii) create, authorize or issue any obligations or security convertible into or the right to purchase any Class Partnership units, without the approval of the holders of the Class A Partnership Units, (iv) enter into a merger or acquisition, or (v) amend or modify the Agreement of Limited Partnership of the Operating Partnership in a manner that adversely affects the relative rights, preferences or privileges of the Class A Partnership Units.
	The following table shows OP Units outstanding and OP Unit activity as of and for the years ended December 31, 2013, 2012, and 2011:
					UDR, Inc.
		Class A Limited	Limited		Limited		General	Total
		Partner	Partners		Partner		Partner
	Ending balance at December 31, 2010	1,751,671	3,310,298		174,736,557		110,883	179,909,409
	OP Units issued for acquisitions of real estate	—	4,371,845		—		—	4,371,845
	OP redemptions for UDR stock (1)	—	(12,511	)	12,511		—	—
	Ending balance at December 31, 2011	1,751,671	7,669,632		174,749,068		110,883	184,281,254
	OP redemptions for cash	—	(5,646	)	5,646		—	—
	OP redemptions for UDR stock	—	(20,438	)	20,438		—	—
	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	—	—		(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
	(1) 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.

Commitments_and_Contingencies_

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013 (dollars in thousands):
		Number of		Costs Incurred			Expected Costs			Average Ownership
		Properties		to Date			to Complete (unaudited)			Stake
	Wholly-owned — under development	6		$	467,413	(a)	$	230,137		100	%
	Wholly-owned — redevelopment	2		134,261		(a)	39,039			100	%
	Joint ventures:
	Unconsolidated joint ventures	2		160,738			130,182		(b)	51	%
	Participating loan investments	1		14,273			77,736		(c)	0	%
				$	776,685		$	477,094
	(a) Costs incurred to date include $41.8 million and $7.7 million of accrued fixed assets for development and
	redevelopment, respectively.
	(b) Represents UDR’s remaining equity commitment of unconsolidated joint ventures.
	(c) Represents UDR’s remaining participating loan commitment for Steele Creek.
	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 2016. Future minimum lease payments as of December 31, 2013 are as follows (dollars in thousands):
			Ground			Office Space
			Leases (a)
	2014		$	5,270		$	691
	2015		5,270			633
	2016		5,270			47
	2017		5,270			—
	2018		5,270			—
	Thereafter		314,501			—
			$	340,851		$	1,371
	(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 $5.2 million, $5.1 million, $4.9 million of ground rent expense for the years ended December 31, 2013, 2012, and 2011, respectively. These costs are reported within the line item Other Operating Expenses on the Consolidated Statements of Operations. The Company incurred $1.3 million, $1.1 million, $1.2 million of rent expense related to office space for the years ended December 31, 2013, 2012, and 2011, respectively. These costs are included in General and Administrative on the Consolidated Statements of Operations.
	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, 2013 (dollars in thousands):
		Number of		Costs Incurred			Expected Costs
		Properties		to Date (a)			to Complete (unaudited)
	Real estate communities — under development	1		$	80,063		$	51,937
	Real estate communities — redevelopment	1		72,581			2,719
				$	152,644		$	54,656
	(a) Includes $7.9 million and $2.4 million of accrued fixed assets for development and redevelopment, respectively.
	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, 2013 are $5.2 million for each of the years ending December 31, 2014 to 2018, and a total of $314.3 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 $5.1 million, $5.0 million, and $4.9 million of ground rent expense for the years ended December 31, 2013, 2012, and 2011, 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, 2013
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 net operating income (“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, 2012 and held as of December 31, 2013. 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 were acquired or developed in 2011, 2012, or 2013, sold properties, redevelopment properties, consolidated joint venture properties, 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, 2013, 2012, and 2011.
	The following table details rental income and NOI from continuing and discontinued operations for UDR’s reportable segments for the years ended December 31, 2013, 2012, and 2011, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Reportable apartment home segment rental income
	Same-Store Communities
	West Region	$	232,374		$	219,988		$	204,570
	Mid-Atlantic Region	166,518			161,991			152,833
	Northeast Region	58,073			54,460			37,553
	Southeast Region	116,192			110,461			105,004
	Southwest Region	40,576			38,099			35,266
	Non-Mature Communities/Other	141,903			159,245			195,732
	Total segment and consolidated rental income	$	755,636		$	744,244		$	730,958
	Reportable apartment home segment NOI
	Same-Store Communities
	West Region	$	165,657		$	154,496		$	141,797
	Mid-Atlantic Region	115,805			112,699			105,213
	Northeast Region	42,353			39,376			27,181
	Southeast Region	75,825			71,218			66,202
	Southwest Region	24,869			22,817			20,319
	Non-Mature Communities/Other	89,532			103,594			124,048
	Total segment and consolidated NOI	514,041			504,200			484,760
	Reconciling items:
	Joint venture management and other fees	12,442			11,911			9,668
	Property management	(20,780		)	(20,465		)	(20,101		)
	Other operating expenses	(7,136		)	(5,718		)	(6,118		)
	Real estate depreciation and amortization	(341,490		)	(350,401		)	(370,343		)
	General and administrative	(42,238		)	(43,792		)	(47,257		)
	Hurricane-related recoveries/(charges), net	12,253			(8,495		)	—
	Other depreciation and amortization	(6,741		)	(4,105		)	(3,931		)
	Income/(loss) from unconsolidated entities	(415		)	(8,579		)	(6,352		)
	Interest expense	(126,083		)	(138,792		)	(156,366		)
	Interest and other income/(expense), net	4,681			2,703			5,688
	Tax benefit, net	7,299			30,282			5,647
	Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership	(1,530		)	(7,986		)	(395		)
	Net (income)/loss attributable to noncontrolling interests	60			(140		)	(167		)
	Net gain/(loss) on sale of depreciable property, net of impairment and tax	40,449			251,554			125,290
	Net income/(loss) attributable to UDR, Inc.	$	44,812		$	212,177		$	20,023
	The following table details the assets of UDR’s reportable segments as of December 31, 2013 and 2012 (dollars in thousands):
		December 31,			December 31,
		2013			2012
	Reportable apartment home segment assets:
	Same-Store communities:
	West Region	$	2,323,850		$	2,325,934
	Mid-Atlantic Region	1,431,590			1,419,873
	Northeast Region	738,805			723,437
	Southeast Region	889,753			887,483
	Southwest Region	350,158			346,449
	Non-mature Communities/Other	2,473,821			2,352,652
	Total segment assets	8,207,977			8,055,828
	Accumulated depreciation	(2,208,794		)	(1,924,682		)
	Total segment assets — net book value	5,999,183			6,131,146
	Reconciling items:
	Cash and cash equivalents	30,249			12,115
	Restricted cash	22,796			23,561
	Deferred financing costs, net	26,924			24,990
Notes receivable, net	83,033			64,006
Investment in and advances to unconsolidated joint ventures, net	507,655			477,631
Other assets	137,882			125,654
Total consolidated assets	$	6,807,722		$	6,859,103
Capital expenditures related to our Same-Store Communities totaled $50.4 million, $48.4 million, and $43.1 million for the years ended December 31, 2013, 2012, and 2011, respectively. Capital expenditures related to our Non-Mature Communities/Other totaled $5.4 million, $6.7 million, and $14.7 million for the years ended December 31, 2013, 2012, and 2011, respectively.
Markets included in the above geographic segments are as follows:
i.	West Region — Orange County, San Francisco, Seattle, Monterey Peninsula, Los Angeles, San Diego, Inland Empire, and Portland
ii.	Mid-Atlantic Region — Metropolitan D.C., Richmond, Baltimore, Norfolk, and Other Mid-Atlantic
iii.	Northeast Region — New York and Boston
iv.	Southeast Region — Tampa, Orlando, Nashville, and Other Florida
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 net operating income (“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, 2012 and held as of December 31, 2013. 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 were acquired or developed in 2011, 2012, or 2013, sold properties, redevelopment properties, 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 of Topic 280 as each of the 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, 2013, 2012, and 2011.
	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, 2013, 2012, and 2011, and reconciles NOI to Net Income/(Loss) Attributable to OP Unitholders in the Consolidated Statements of Operations (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Reportable apartment home segment rental income
	Same-Store Communities
	West Region	$	175,384		$	166,181		$	156,587
	Mid-Atlantic Region	68,205			66,487			64,020
	Northeast Region	36,623			34,579			24,408
	Southeast Region	43,208			40,771			38,606
	Southwest Region	21,105			19,859			18,286
	Non-Mature Communities/Other	66,317			72,814			85,150
	Total segment and consolidated rental income	$	410,842		$	400,691		$	387,057
	Reportable apartment home segment NOI
	Same-Store Communities
	West Region	$	125,956		$	117,744		$	109,672
	Mid-Atlantic Region	46,770			45,801			44,400
	Northeast Region	27,149			25,653			17,829
	Southeast Region	28,105			26,510			24,212
	Southwest Region	13,293			12,225			10,994
	Non-Mature Communities/Other	46,262			53,605			57,151
	Total segment and consolidated NOI	287,535			281,538			264,258
	Reconciling items:
	Property management	(11,298		)	(11,019		)	(10,644		)
	Other operating expenses	(5,728		)	(5,272		)	(5,484		)
	Real estate depreciation and amortization	(181,302		)	(195,051		)	(197,964		)
	General and administrative	(24,808		)	(26,204		)	(26,370		)
	Hurricane-related recoveries/(charges), net	8,083			(5,518		)	—
	Interest expense	(36,058		)	(45,234		)	(53,632		)
	Net gain/(loss) on the sale of depreciable properties	41,518			51,094			60,065
	Net income/(loss) attributable to noncontrolling interests	(4,566		)	(352		)	(70		)
	Net income/(loss) attributable to OP unitholders	$	73,376		$	43,982		$	30,159
	The following table details the assets of the Operating Partnership’s reportable segments as of December 31, 2013 and 2012 (dollars in thousands):
		December 31,			December 31, 2012
		2013
	Reportable apartment home segment assets
	Same-Store Communities
	West Region	$	1,664,314		$	1,651,316
	Mid-Atlantic Region	706,447			701,741
	Northeast Region	443,483			434,138
	Southeast Region	328,150			322,882
	Southwest Region	186,934			185,501
	Non-Mature Communities/Other	859,152			887,342
	Total segment assets	4,188,480			4,182,920
	Accumulated depreciation	(1,241,574		)	(1,097,133		)
	Total segment assets - net book value	2,946,906			3,085,787
	Reconciling items:
	Cash and cash equivalents	1,897			2,804
	Restricted cash	13,526			12,926
	Deferred financing costs, net	5,848			6,072
	Other assets	25,064			28,665
	Total consolidated assets	$	2,993,241		$	3,136,254
	Capital expenditures related to the Operating Partnership’s Same-Store Communities totaled $25.9 million and $27.2 million for the years ended December 31, 2013 and 2012, respectively. Capital expenditures related to the Operating Partnership’s Non-Mature Communities/Other totaled $1.9 million and $2.7 million for the years ended December 31, 2013 and 2012, respectively.
	Markets included in the above geographic segments are as follows:
	i.	West Region — Orange County, San Francisco, Monterey Peninsula, Los Angeles, Seattle, Inland Empire, Portland, and San Diego
	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 Region — Dallas

Hurricane_Related_Charges_UNIT

Hurricane Related Charges (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
Hurricane Related Charges	'
	HURRICANE-RELATED (RECOVERIES)/CHARGES
	In October 2012, Hurricane Sandy hit the East Coast, affecting three of the Company’s operating communities (1,706 apartment homes) located in New York City. The properties suffered some physical damage, and were closed to residents for a period following the hurricane. The Company has insurance policies that provide coverage for property damage and business interruption, subject to applicable retention.
	Based on the claims filed and management’s estimates, the Company recognized a $9.0 million impairment charge for the damaged assets’ net book value and incurred $10.4 million of repair and cleanup costs during the year ended December 31, 2012. The impairment charge and the repair and cleanup costs incurred were reduced as of December 31, 2012 by $14.5 million of estimated insurance recovery, and were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations. During the year ended December 31, 2013, no material adjustments to the impairment charge and the repair and cleanup costs incurred were recognized. With the exception of one of the properties that is under redevelopment at December 31, 2013, the rehabilitation of the remaining two properties was substantially completed as of December 31, 2013.
	As of December 31, 2013, the Company had settled the Hurricane Sandy claims and received insurance proceeds in excess of the $14.5 million estimated insurance recovery receivable related to the impairment charge and the repair and cleanup costs incurred. As a result, the Company recognized a Hurricane-related recovery of approximately $4.8 million and a casualty gain of approximately $654,000 for the year ended December 31, 2013. Both the recovery and casualty gain were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations.
	Based on the claims filed and management’s estimates, the Company recognized $4.4 million of business interruption losses for the year ended December 31, 2012, of which $3.6 million were related to rent concession rebates provided to residents during the period the properties were uninhabitable and were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations, and $767,000 were related to rent that was not contractually receivable and were classified as a reduction to Rental Income on the Consolidated Statements of Operations. As noted below, the Company recovered from the insurance carrier approximately $4.2 million of the $4.4 million of 2012 business interruption losses. The Company estimates that it incurred an additional $3.4 million of business interruption losses for the year ended December 31, 2013. As noted below, the Company recovered from the insurance carrier approximately $2.6 million of the $3.4 million of 2013 business interruption losses.
	During the year ended December 31, 2013, the Company received approximately $6.8 million of insurance proceeds for recovery of business interruption losses. Of the $6.8 million of insurance proceeds received in 2013, $4.2 million related to recovery of business interruption losses incurred in 2012 and the remaining $2.6 million related to recovery of business interruption losses incurred in 2013. The $6.8 million of recovery was classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations as of December 31, 2013.
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
Hurricane Related Charges	'
	HURRICANE-RELATED RECOVERIES/(CHARGES)
	In October 2012, Hurricane Sandy hit the East Coast, affecting two of the Operating Partnership’s operating communities (1,001 apartment homes) located in New York City. The properties suffered some physical damage, and were closed to residents for a period following the hurricane. The Operating Partnership has insurance policies that provide coverage for property damage and business interruption, subject to applicable retention.
	Based on the claims filed and management’s estimates, the Operating Partnership recognized a $7.1 million impairment charge for the damaged assets’ net book value and incurred $7.0 million of repair and cleanup costs during the year ended December 31, 2012. The impairment charge and the repair and cleanup costs incurred were reduced as of December 31, 2012 by $10.8 million of estimated insurance recovery, and were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations. During the year ended December 31, 2013, no material adjustments to the impairment charge and the repair and cleanup costs incurred were recognized. The rehabilitation of these two properties was substantially completed as of December 31, 2013.
	As of December 31, 2013, the Operating Partnership had settled the Hurricane Sandy claims and received insurance proceeds in excess of the $10.8 million estimated insurance recovery receivable related to the impairment charge and the repair and cleanup costs incurred. As a result, the Company recognized a Hurricane-related recovery of approximately $3.3 million and a casualty gain of approximately $582,000 for the year ended December 31, 2013. Both the recovery and casualty gain were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations.
	Based on the claims filed and management’s estimates, the Operating Partnership recognized $2.2 million of business interruption losses for the year ended December 31, 2012, of which $1.8 million were related to rent concession rebates provided to residents during the period the properties were uninhabitable and were classified in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations, and $400,000 were related to rent that was not contractually receivable and were classified as a reduction to Rental Income on the Consolidated Statements of Operations. The Company estimates that it incurred an additional $2.1 million of business interruption losses for the year ended December 31, 2013. As noted, the Company settled the Hurricane Sandy claims as of December 31, 2013.
	During the year ended December 31, 2013, the Operating Partnership received approximately $4.2 million of insurance proceeds for recovery of business interruption losses. Of the $4.2 million of insurance proceeds received during the year ended December 31, 2013, $2.1 million related to recovery of business interruption losses incurred in 2012 and the remaining $2.1 million related to recovery of business interruption losses incurred in 2013. The $4.2 million of recovery was included in Hurricane-Related (Recoveries)/Charges, Net on the Consolidated Statements of Operations.

Unaudited_Summarized_Consolida1

Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 is summarized in the table below (dollars in thousands, except per share amounts):
			Three Months Ended
			March 31,			June 30,			September 30,			December 31,
	2013
	Rental income (a)		$	181,961		$	186,285		$	187,917		$	190,321
	Income/(loss) from continuing operations		(1,162		)	4,525			2,351			(3,374		)
	Income/(loss) from discontinued operations, net of tax		853			829			884			41,376
	Net income/(loss) attributable to common stockholders		(1,199		)	4,261			2,257			35,769
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	(0.00	)	$	0.02		$	0.01		$	0.14
	2012
	Rental income (a)		$	169,950		$	175,153		$	179,448		$	180,150
	Income/(loss) from continuing operations		915			(23,961		)	(9,287		)	(13,972		)
	Income/(loss) from discontinued operations, net of tax		85,713			180,268			(389		)	1,016
	Net income/(loss) attributable to common stockholders		80,848			145,721			(9,962		)	(13,231		)
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	0.37		$	0.62		$	(0.04	)	$	(0.05	)
	(a)	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
	(b)	Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.
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, 2013 and 2012 is summarized in the table blow (dollars in thousands, except per share amounts):
			Three Months Ended
			March 31,			June 30,			September 30,			December 31,
	2013
	Rental income (a)		$	97,770		$	100,421		$	101,558		$	102,104
	Income/(loss) from continuing operations		6,870			9,339			10,069			6,488
	Income/(loss) from discontinued operations		905			882			982			42,407
	Income/(loss) attributable to OP unitholders		7,729			10,154			11,011			44,482
	Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (b)		$	0.04		$	0.06		$	0.06		$	0.24
	2012
	Rental income (a)		$	93,659		$	95,766		$	97,974		$	97,547
	Income/(loss) from continuing operations		(8,690		)	(2,841		)	(532		)	(1,246		)
	Income/(loss) from discontinued operations		1,799			54,243			656			945
	Income/(loss) attributable to OP unitholders		(6,926		)	51,172			85			(349		)
	Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (b)		$	(0.04	)	$	0.28		$	0		$	(0.00	)
	(a)	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
	(b)	Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts due to rounding.

Schedule_III_Real_Estate_Owned

Schedule - III Real Estate Owned	12 Months Ended
	Dec. 31, 2013
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			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
						Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
						Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
	WEST REGION
	Harbor at Mesa Verde		$	50,358		$	20,476		$	28,538		$	49,014	$	12,291		$	20,963	$	40,342	$	61,305	$	24,805	2003	3-Jun
	27 Seventy Five Mesa Verde		30,660			99,329			110,644			209,973		83,889			107,578		186,284		293,862		57,965		2013	4-Oct
	Pacific Shores		34,112			7,345			22,624			29,969		8,808			7,721		31,056		38,777		18,492		2003	3-Jun
	Huntington Vista		27,972			8,055			22,486			30,541		6,972			8,312		29,201		37,513		17,615		1970	3-Jun
	Missions at Back Bay		—			229			14,129			14,358		2,045			10,778		5,625		16,403		3,772		1969	3-Dec
	Coronado at Newport — North		—			62,516			46,082			108,598		23,596			66,683		65,511		132,194		38,108		2000	4-Oct
	Huntington Villas		50,771			61,535			18,017			79,552		6,378			62,096		23,834		85,930		14,471		1972	4-Sep
	Vista Del Rey		—			10,670			7,080			17,750		1,908			10,819		8,839		19,658		5,270		1969	4-Sep
	Foxborough		—			12,071			6,187			18,258		2,669			12,328		8,599		20,927		4,660		1969	4-Sep
	Coronado South		—			58,785			50,067			108,852		16,881			59,183		66,550		125,733		36,990		2000	5-Mar
	1818 Platinum Triangle		—			16,663			51,905			68,568		125			16,693		52,000		68,693		10,493		2009	10-Aug
	The Residences at Bella Terra		—			25,000			—			25,000		122,185			25,037		122,148		147,185		3,072		2013	11-Oct
	ORANGE COUNTY, CA		193,873			382,674			377,759			760,433		287,747			408,191		639,989		1,048,180		235,713
	2000 Post Street		—			9,861			44,578			54,439		7,254			10,221		51,472		61,693		22,853		1987	Dec-98
	Birch Creek		—			4,365			16,696			21,061		6,150			5,026		22,185		27,211		12,068		1968	Dec-98
	Highlands Of Marin		—			5,996			24,868			30,864		25,534			7,095		49,303		56,398		23,816		2010	Dec-98
	Marina Playa		—			6,224			23,916			30,140		8,811			6,886		32,065		38,951		17,166		1971	Dec-98
	River Terrace		33,130			22,161			40,137			62,298		2,851			22,308		42,841		65,149		21,251		2005	5-Aug
	CitySouth		—			14,031			30,537			44,568		35,031			16,220		63,379		79,599		25,108		2012	5-Nov
	Bay Terrace		—			8,545			14,458			23,003		4,357			11,413		15,947		27,360		7,730		1962	5-Oct
	Highlands of Marin Phase II		—			5,353			18,559			23,912		11,038			5,753		29,197		34,950		11,297		2010	7-Oct
	Edgewater		—			30,657			83,872			114,529		2,861			30,675		86,715		117,390		29,050		2007	8-Mar
	Almaden Lake Village		27,000			594			42,515			43,109		4,367			729		46,747		47,476		15,391		1999	8-Jul
	388 Beale		—			14,253			74,104			88,357		3,836			14,274		77,919		92,193		11,688		1999	11-Apr
	2000 Post III		—			1,756			7,753			9,509		3,001			3,291		9,219		12,510		4,965		2006	Dec-98
	SAN FRANCISCO, CA		60,130			123,796			421,993			545,789		115,091			133,891		526,989		660,880		202,383
	Rosebeach		—			8,414			17,449			25,863		2,664			8,558		19,969		28,527		10,949		1970	4-Sep
	Ocean Villas		—			5,135			12,789			17,924		1,671			5,245		14,350		19,595		7,652		1965	4-Oct
	Tierra Del Rey		32,635			39,586			36,679			76,265		2,584			39,646		39,203		78,849		14,238		1999	7-Dec
	The Westerly		67,700			48,182			102,364			150,546		35,475			50,594		135,427		186,021		24,613		2013	10-Sep
	Pine@Sixth		—			5,805			6,305			12,110		12,723			6,251		18,582		24,833		14,797		2008	Dec-98
	Jefferson at Marina del Rey		—			55,651			—			55,651		88,695			61,189		83,157		144,346		23,239		2008	7-Sep
	LOS ANGELES, CA		100,335			162,773			175,586			338,359		143,812			171,483		310,688		482,171		95,488
	Arbor Terrace		—			1,453			11,995			13,448		3,541			1,813		15,176		16,989		8,479		1996	Mar-98
	Aspen Creek		10,819			1,178			9,116			10,294		2,602			1,451		11,445		12,896		5,876		1996	Dec-98
	Crowne Pointe		—			2,486			6,437			8,923		4,827			2,808		10,942		13,750		6,580		1987	Dec-98
	Hilltop		—			2,174			7,408			9,582		3,432			2,658		10,356		13,014		6,008		1985	Dec-98
	The Hawthorne		36,093			6,474			30,226			36,700		2,594			6,569		32,725		39,294		16,473		2003	5-Jul
	The Kennedy		—			6,179			22,307			28,486		1,593			6,232		23,847		30,079		11,244		2005	5-Nov
	Hearthstone at Merrill Creek		23,341			6,848			30,922			37,770		2,407			6,957		33,220		40,177		11,289		2000	8-May
	Island Square		—			21,284			89,389			110,673		3,318			21,401		92,590		113,991		29,209		2007	8-Jul
	Borgata		—			6,379			24,569			30,948		586			6,399		25,135		31,534		9,552		2001	7-May
	elements too		—			27,468			72,036			99,504		13,284			30,060		82,728		112,788		27,096		2010	10-Feb
	989elements		—			8,541			45,990			54,531		1,054			8,538		47,047		55,585		10,860		2006	9-Dec
	SEATTLE, WA		70,253			90,464			350,395			440,859		39,238			94,886		385,211		480,097		142,666
	Presidio at Rancho Del Oro		—			9,164			22,694			31,858		6,270			9,722		28,406		38,128		16,802		1987	4-Jun
	Villas at Carlsbad		—			6,517			10,718			17,235		2,059			6,722		12,572		19,294		6,607		1966	4-Oct
	13th & Market		34,780			10,300			—			10,300		60,847			10,305		60,842		71,147		628		2013	11-May
	SAN DIEGO, CA		34,780			25,981			33,412			59,393		69,176			26,749		101,820		128,569		24,037
						Initial Costs											Gross Amount at Which Carried at Close of Period
			Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
						Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
						Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
	Boronda Manor		—			1,946			8,982			10,928		9,126			3,145		16,909		20,054		7,952		1979	Dec-98
	Garden Court		—			888			4,188			5,076		5,123			1,491		8,708		10,199		4,203		1973	Dec-98
	Cambridge Court		—			3,039			12,883			15,922		13,910			5,197		24,635		29,832		12,143		1974	Dec-98
	Laurel Tree		—			1,304			5,115			6,419		5,577			2,131		9,865		11,996		4,904		1977	Dec-98
	The Pointe At Harden Ranch		—			6,388			23,854			30,242		24,885			9,816		45,311		55,127		21,627		1986	Dec-98
The Pointe At Northridge		—			2,044			8,028			10,072		9,451			3,242		16,281		19,523		8,239		1979	Dec-98
The Pointe At Westlake		—			1,329			5,334			6,663		5,883			2,129		10,417		12,546		4,854		1975	Dec-98
MONTEREY PENINSULA, CA		—			16,938			68,384			85,322		73,955			27,151		132,126		159,277		63,922
Verano at Rancho Cucamonga Town Square		46,471			13,557			3,645			17,202		52,994			22,995		47,201		70,196		28,367		2006	2-Oct
Windemere at Sycamore Highland		—			5,810			23,450			29,260		2,437			6,041		25,656		31,697		15,998		2001	2-Nov
INLAND EMPIRE, CA		46,471			19,367			27,095			46,462		55,431			29,036		72,857		101,893		44,365
Tualatin Heights		—			3,273			9,134			12,407		6,204			3,813		14,798		18,611		9,082		1989	Dec-98
Andover Park		16,818			2,916			16,995			19,911		7,783			3,150		24,544		27,694		14,770		1989	4-Sep
Hunt Club		18,323			6,014			14,870			20,884		5,620			6,351		20,153		26,504		12,502		1985	4-Sep
PORTLAND, OR		35,141			12,203			40,999			53,202		19,607			13,314		59,495		72,809		36,354
TOTAL WEST REGION		540,983			834,196			1,495,623			2,329,819		804,057			904,701		2,229,175		3,133,876		844,928
MID-ATLANTIC REGION
Dominion Middle Ridge		30,317			3,311			13,283			16,594		6,302			3,730		19,166		22,896		12,969		1990	Jun-96
Dominion Lake Ridge		20,712			2,366			8,387			10,753		5,649			2,842		13,560		16,402		9,348		1987	Feb-96
Presidential Greens		—			11,238			18,790			30,028		8,330			11,579		26,779		38,358		17,910		1938	2-May
The Whitmore		—			6,418			13,411			19,829		19,931			7,460		32,300		39,760		20,140		2008	2-Apr
Ridgewood		—			5,612			20,086			25,698		7,864			5,986		27,576		33,562		18,660		1988	2-Aug
Commons at Town Square		—			136			7,724			7,860		1,399			6,874		2,385		9,259		1,393		1971	3-Dec
Waterside Towers		—			874			38,209			39,083		11,828			26,396		24,515		50,911		15,623		1971	3-Dec
Waterside Townhomes		—			129			3,724			3,853		691			2,725		1,819		4,544		1,067		1971	3-Dec
Wellington Place at Olde Town		28,681			13,753			36,059			49,812		16,856			14,629		52,039		66,668		29,361		2008	5-Sep
Andover House		—			14,357			51,577			65,934		2,755			14,373		54,316		68,689		21,542		2004	7-Mar
Sullivan Place		—			1,137			103,676			104,813		4,352			1,235		107,930		109,165		38,559		2007	7-Dec
Circle Towers		70,328			32,815			107,051			139,866		9,199			32,994		116,071		149,065		37,847		1972	8-Mar
Delancey at Shirlington		—			21,606			66,765			88,371		1,441			21,621		68,191		89,812		22,662		2006/07	8-Mar
View 14		—			5,710			97,941			103,651		2,348			5,721		100,278		105,999		14,274		2009	11-Jun
Signal Hill		—			13,290			—			13,290		69,317			25,375		57,232		82,607		15,912		2010	7-Mar
Capitol View on 14th		—			31,393			—			31,393		91,966			31,393		91,966		123,359		5,217		2013	7-Sep
METROPOLITAN, D.C.		150,038			164,145			586,683			750,828		260,228			214,933		796,123		1,011,056		282,484
Dominion Kings Place		14,768			1,565			7,007			8,572		4,132			1,808		10,896		12,704		7,693		1983	Dec-92
Dominion At Eden Brook		—			2,361			9,384			11,745		6,308			2,944		15,109		18,053		11,307		1984	Dec-92
Ellicott Grove		—			2,920			9,099			12,019		22,626			5,278		29,367		34,645		21,159		2008	Jul-94
Dominion Constant Freindship		10,683			903			4,669			5,572		3,704			1,221		8,055		9,276		5,629		1990	May-95
Lakeside Mill		15,242			2,666			10,109			12,775		4,189			2,919		14,045		16,964		10,290		1989	Dec-99
Tamar Meadow		—			4,145			17,150			21,295		4,707			4,559		21,443		26,002		14,199		1990	2-Nov
Calvert’s Walk		—			4,408			24,692			29,100		6,436			4,660		30,876		35,536		18,463		1988	4-Mar
Arborview Apartments		—			4,653			23,952			28,605		7,191			5,146		30,650		35,796		18,972		1992	4-Mar
Liriope Apartments		—			1,620			6,791			8,411		1,149			1,646		7,914		9,560		4,770		1997	4-Mar
20 Lambourne		31,511			11,750			45,590			57,340		4,481			11,990		49,831		61,821		18,123		2003	8-Mar
Domain Brewers Hill		—			4,669			40,630			45,299		502			4,675		41,126		45,801		7,953		2009	10-Aug
BALTIMORE, MD		72,204			41,660			199,073			240,733		65,425			46,846		259,312		306,158		138,558
Dominion English Hills		—			1,979			11,524			13,503		8,224			2,873		18,854		21,727		11,134		1969/76	Dec-91
Gayton Pointe Townhomes		—			826			5,148			5,974		29,095			3,386		31,683		35,069		24,775		2007	Sep-95
					Initial Costs											Gross Amount at Which Carried at Close of Period
		Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
					Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
					Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
Waterside At Ironbridge		—			1,844			13,239			15,083		6,980			2,293		19,770		22,063		12,304		1987	Sep-97
Carriage Homes at Wyndham		—			474			30,997			31,471		7,389			3,780		35,080		38,860		22,093		1998	3-Nov
Legacy at Mayland		41,507			—			—			—		20,453			1,966		18,487		20,453		16,639		2007	Dec-91
RICHMOND, VA		41,507			5,123			60,908			66,031		72,141			14,298		123,874		138,172		86,945
Forest Lake At Oyster Point		—			780			8,862			9,642		8,723			1,388		16,977		18,365		12,294		1986	Aug-95
Woodscape		—			798			7,209			8,007		9,447			2,053		15,401		17,454		13,149		1974/76	Dec-87
Eastwind		—			155			5,317			5,472		6,186			656		11,002		11,658		8,749		1970	Apr-88
Dominion Waterside At Lynnhaven		—			1,824			4,107			5,931		6,072			2,262		9,741		12,003		7,240		1966	Aug-96
Heather Lake		—			617			3,400			4,017		9,926			1,205		12,738		13,943		11,714		1972/74	Mar-80
Dominion Yorkshire Downs		—			1,089			8,582			9,671		5,839			1,575		13,935		15,510		8,793		1987	Dec-97
NORFOLK, VA		—			5,263			37,477			42,740		46,193			9,139		79,794		88,933		61,939
Greens At Schumaker Pond		—			710			6,118			6,828		5,667			1,011		11,484		12,495		8,072		1988	May-95
OTHER MID-ATLANTIC		—			710			6,118			6,828		5,667			1,011		11,484		12,495		8,072
TOTAL MID-ATLANTIC REGION		263,749			216,901			890,259			1,107,160		449,654			286,227		1,270,587		1,556,814		577,998
SOUTHEAST REGION
Summit West		—			2,176			4,710			6,886		8,166			3,200		11,853		15,053		9,878		1972	Dec-92
The Breyley		—			1,780			2,458			4,238		16,895			3,292		17,841		21,133		15,476		2007	Sep-93
Lakewood Place		18,835			1,395			10,647			12,042		8,597			2,260		18,379		20,639		13,036		1986	Mar-94
Bay Meadow		—			2,893			9,254			12,147		9,924			4,220		17,851		22,071		12,779		2004	Dec-96
Cambridge Woods		—			1,791			7,166			8,957		8,082			2,574		14,465		17,039		10,086		1985	Jun-97
Sugar Mill Creek		—			2,242			7,553			9,795		6,567			2,720		13,642		16,362		8,401		1988	Dec-98
Inlet Bay		—			7,702			23,150			30,852		13,740			9,005		35,587		44,592		24,223		1988/89	3-Jun
MacAlpine Place		—			10,869			36,858			47,727		6,862			11,264		43,325		54,589		24,392		2001	4-Dec
The Vintage Lofts at West End		—			6,611			37,663			44,274		15,317			15,111		44,480		59,591		15,843		2009	9-Jul
Gallery at Bayport II		—			5,775			17,236			23,011		3,124			8,601		17,534		26,135		7,206		2008	6-Oct
Island Walk		—			7,231			19,897			27,128		11,342			5,032		33,438		38,470		20,797		1985/87	6-Jul
TAMPA, FL		18,835			50,465			176,592			227,057		108,616			67,279		268,395		335,674		162,117
Seabrook		—			1,846			4,155			6,001		7,724			2,680		11,045		13,725		8,598		2004	Feb-96
The Canopy Apartment Villas		—			2,895			6,456			9,351		22,188			5,415		26,124		31,539		21,758		2008	Mar-93
Altamira Place		15,640			1,533			11,076			12,609		19,642			3,318		28,933		32,251		23,111		2007	Apr-94
Regatta Shore		—			757			6,608			7,365		14,720			1,963		20,122		22,085		15,550		2007	Jun-94
Alafaya Woods		18,366			1,653			9,042			10,695		8,554			2,491		16,758		19,249		11,938		2006	Oct-94
Los Altos		22,308			2,804			12,349			15,153		9,689			3,904		20,938		24,842		13,324		2004	Oct-96
Lotus Landing		—			2,185			8,639			10,824		9,111			2,794		17,141		19,935		10,407		2006	Jul-97
Seville On The Green		—			1,282			6,498			7,780		6,484			1,686		12,578		14,264		8,054		2004	Oct-97
Ashton @ Waterford		23,778			3,872			17,538			21,410		3,364			4,162		20,612		24,774		12,156		2000	May-98
Arbors at Lee Vista		—			6,692			12,860			19,552		12,284			7,126		24,710		31,836		17,054		2007	6-Aug
The Place on Millenia Blvd		—			12,172			37,143			49,315		2,204			12,223		39,296		51,519		16,269		2007	8-Jan
ORLANDO, FL		80,092			37,691			132,364			170,055		115,964			47,762		238,257		286,019		158,219
Legacy Hill		—			1,148			5,867			7,015		8,460			1,721		13,754		15,475		10,377		1977	Nov-95
Hickory Run		—			1,469			11,584			13,053		9,295			2,086		20,262		22,348		12,690		1989	Dec-95
Carrington Hills		—			2,117			—			2,117		33,002			4,413		30,706		35,119		18,870		1999	Dec-95
Brookridge		—			708			5,461			6,169		4,311			1,118		9,362		10,480		6,288		1986	Mar-96
Breckenridge		—			766			7,714			8,480		4,093			1,222		11,351		12,573		7,249		1986	Mar-97
Colonnade		—			1,460			16,015			17,475		4,432			1,868		20,039		21,907		10,699		1998	Jan-99
The Preserve at Brentwood		22,527			3,182			24,674			27,856		5,693			3,483		30,066		33,549		18,574		1998	4-Jun
Polo Park		—			4,583			16,293			20,876		15,729			5,624		30,981		36,605		18,530		2008	6-May
NASHVILLE, TN		22,527			15,433			87,608			103,041		85,015			21,535		166,521		188,056		103,277
The Reserve and Park at Riverbridge		40,133			15,968			56,401			72,369		7,637			16,351		63,654		80,005		34,308		1999/2001	4-Dec
					Initial Costs											Gross Amount at Which Carried at Close of Period
		Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
					Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
					Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
OTHER FLORIDA		40,133			15,968			56,401			72,369		7,637			16,351		63,654		80,005		34,308
TOTAL SOUTHEAST REGION		161,587			119,557			452,965			572,522		317,232			152,927		736,827		889,754		457,921
NORTHEAST REGION
Garrison Square		—			5,591			91,027			96,618		5,176			5,603		96,191		101,794		18,059		1887/1990	10-Sep
Ridge at Blue Hills		23,509			6,039			34,869			40,908		752			6,078		35,582		41,660		6,867		2007	10-Sep
Inwood West		57,928			20,778			88,096			108,874		2,559			20,849		90,584		111,433		14,498		2006	11-Apr
14 North		—			10,961			51,175			62,136		2,827			10,994		53,969		64,963		9,118		2005	11-Apr
BOSTON, MA		81,437			43,369			265,167			308,536		11,314			43,524		276,326		319,850		48,542
10 Hanover Square		196,376			41,432			218,983			260,415		6,821			41,463		225,773		267,236		31,043		2005	11-Apr
21 Chelsea		—			36,399			107,154			143,553		8,316			36,399		115,470		151,869		14,118		2001	11-Aug
Rivergate		—			114,410			324,920			439,330		63,298			114,731		387,897		502,628		47,279		1985/2013	11-Jul
95 Wall Street		—			57,637			266,255			323,892		3,656			57,736		269,812		327,548		38,298		2008	11-Aug
NEW YORK, NY		196,376			249,878			917,312			1,167,190		82,091			250,329		998,952		1,249,281		130,738
TOTAL NORTHEAST REGION		277,813			293,247			1,182,479			1,475,726		93,405			293,853		1,275,278		1,569,131		179,280
SOUTHWEST REGION
THIRTY377		30,660			24,036			32,951			56,987		7,276			24,309		39,954		64,263		19,168		2007	6-Aug
Legacy Village		72,415			16,882			100,102			116,984		5,685			17,101		105,568		122,669		37,798		6/7/05	8-Mar
Garden Oaks		—			2,132			5,367			7,499		1,396			6,928		1,967		8,895		1,638		1979	7-Mar
Glenwood		—			7,903			554			8,457		1,643			8,150		1,950		10,100		1,146		1970	7-May
Talisker of Addison		—			10,440			634			11,074		1,784			10,841		2,017		12,858		1,593		1975	7-May
Springhaven		—			6,688			3,354			10,042		1,130			8,350		2,822		11,172		2,004		1977	7-Apr
Clipper Pointe		—			13,221			2,507			15,728		2,051			14,906		2,873		17,779		2,345		1978	7-May
Highlands of Preston		—			2,151			8,168			10,319		30,614			5,975		34,958		40,933		22,141		2008	Mar-98
DALLAS, TX		103,075			83,453			153,637			237,090		51,579			96,560		192,109		288,669		87,833
Barton Creek Landing		—			3,151			14,269			17,420		21,900			4,706		34,614		39,320		17,554		2010	2-Mar
Residences at the Domain		30,661			4,034			55,256			59,290		2,199			4,197		57,292		61,489		18,502		2007	8-Aug
Red Stone Ranch		19,961			5,084			17,646			22,730		1,140			5,114		18,756		23,870		2,180		2000	12-Apr
Lakeline Villas		15,432			4,148			16,869			21,017		645			4,157		17,505		21,662		2,030		2004	12-Apr
AUSTIN, TX		66,054			16,417			104,040			120,457		25,884			18,174		128,167		146,341		40,266
TOTAL SOUTHWEST REGION		169,129			99,870			257,677			357,547		77,463			114,734		320,276		435,010		128,099
TOTAL OPERATING COMMUNITIES		1,413,261			1,563,771			4,279,003			5,842,774		1,741,811			1,752,442		5,832,143		7,584,585		2,188,226
REAL ESTATE UNDER DEVELOPMENT
Los Alisos		—			17,298			—			17,298		63,325			16,386		64,237		80,623		300
Mission Bay		—			23,625			—			23,625		117,643			23,653		117,615		141,268		116
DelRay Tower		—			297			12,786			13,083		66,980			9,447		70,616		80,063		—
Pier 4		—			24,584			—			24,584		54,418			24,584		54,418		79,002		—
Beach Walk		—			12,878			—			12,878		15,179			13,007		15,050		28,057		—
Domain College Park		28,816			7,300			—			7,300		51,100			7,306		51,094		58,400		995
TOTAL REAL ESTATE UNDER DEVELOPMENT		28,816			85,982			12,786			98,768		368,645			94,383		373,030		467,413		1,411
LAND
2919 Wilshire		—			6,773			527			7,300		503			6,773		1,030		7,803		317
3032 Wilshire		—			9,963			788			10,751		990			9,963		1,778		11,741		495
3033 Wilshire		—			11,055			—			11,055		7,249			11,049		7,255		18,304		—
7 Harcourt		—			884			—			884		4,176			884		4,176		5,060		420
Parkers Landing II		—			1,710			—			1,710		762			1,511		961		2,472		—
Presidio		—			1,524			—			1,524		921			1,300		1,145		2,445		—
Waterside		—			11,862			93			11,955		129			11,862		222		12,084		249
Vitruvian		—			4,325			1,360			5,685		7,683			11,150		2,218		13,368		1,964
TOTAL LAND		—			48,096			2,768			50,864		22,413			54,492		18,785		73,277		3,445
REAL ESTATE HELD FOR DISPOSITION
Grandview DCO		—			7,266			9,702			16,968		(249		)	10,751		5,969		16,720		6,568
TOTAL HELD FOR DISPOSITION		—			7,266			9,702			16,968		(249		)	10,751		5,969		16,720		6,568
					Initial Costs											Gross Amount at Which Carried at Close of Period
		Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
					Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
					Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
COMMERCIAL
Hanover Village		—			1,624			—			1,624		—			1,104		520		1,624		553
Circle Towers Office Bldg		—			1,407			4,498			5,905		1,518			1,380		6,043		7,423		1,789
Brookhaven Shopping Center		—			4,943			7,093			12,036		9,487			7,793		13,730		21,523		6,278
Bellevue Plaza retail		—			24,377			7,517			31,894		276			29,920		2,250		32,170		499
TOTAL COMMERCIAL		—			32,351			19,108			51,459		11,281			40,197		22,543		62,740		9,119
Other (b)		—			—			—			—		3,242			—		3,242		3,242		25
TOTAL CORPORATE		—			—			—			—		3,242			—		3,242		3,242		25
TOTAL COMMERCIAL & CORPORATE		—			32,351			19,108			51,459		14,523			40,197		25,785		65,982		9,144
TOTAL REAL ESTATE OWNED		$	1,442,077		$	1,737,466		$	4,323,367		$	6,060,833	$	2,147,143		$	1,952,265	$	6,255,712	$	8,207,977	$	2,208,794
(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 $7.5 billion at December 31, 2013.
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):
		2013			2012			2011
Balance at beginning of the year		$	8,055,828		$	8,074,471		$	6,881,347
Real estate acquired		—			141,648			1,590,514
Capital expenditures and development		452,057			422,480			189,711
Real estate sold		(70,687		)	(559,154		)	(587,101		)
Real estate contributed to joint ventures		(356,303		)	—			—
Consolidation of joint venture assets		129,437			—			—
Retirement of fully depreciated assets		—			(13,945		)	—
Impairment of assets, including hurricane-related impairments		(2,355		)	(9,672		)	—
Balance at end of the year		$	8,207,977		$	8,055,828		$	8,074,471
The following is a reconciliation of total accumulated depreciation for real estate owned at December 31:
		2013			2012			2011
Balance at beginning of the year		$	1,924,682		$	1,831,727		$	1,638,326
Depreciation expense for the year		339,326			340,800			341,925
Accumulated depreciation on sales		(34,794		)	(233,207		)	(148,524		)
Accumulated depreciation on real estate contributed to joint ventures		(20,662		)	—			—
Accumulated depreciation on assets of consolidated joint ventures		1,374			—			—
Accumulated depreciation on retirements of fully depreciated assets		(1,132		)	(13,945		)	—
Write off of accumulated depreciation on hurricane-related impaired assets		—			(693		)	—
Balance at end of year		$	2,208,794		$	1,924,682		$	1,831,727

Schedule_III_Real_Estate_Owned1

Schedule III - Real Estate Owned (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2013
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			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
						Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
						Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
	WEST REGION
	Harbor at Mesa Verde		$	50,358		$	20,476		$	28,538		$	49,014	$	12,291		$	20,963	$	40,342	$	61,305	$	24,805	2003	3-Jun
	27 Seventy Five Mesa Verde		30,660			99,329			110,644			209,973		83,889			107,578		186,284		293,862		57,965		2013	4-Oct
	Pacific Shores		34,112			7,345			22,624			29,969		8,808			7,721		31,056		38,777		18,492		2003	3-Jun
	Huntington Vista		27,972			8,055			22,486			30,541		6,972			8,312		29,201		37,513		17,615		1970	3-Jun
	Missions at Back Bay		—			229			14,129			14,358		2,045			10,778		5,625		16,403		3,772		1969	3-Dec
	Coronado at Newport — North		—			62,516			46,082			108,598		23,596			66,683		65,511		132,194		38,108		2000	4-Oct
	Huntington Villas		50,771			61,535			18,017			79,552		6,378			62,096		23,834		85,930		14,471		1972	4-Sep
	Vista Del Rey		—			10,670			7,080			17,750		1,908			10,819		8,839		19,658		5,270		1969	4-Sep
	Foxborough		—			12,071			6,187			18,258		2,669			12,328		8,599		20,927		4,660		1969	4-Sep
	Coronado South		—			58,785			50,067			108,852		16,881			59,183		66,550		125,733		36,990		2000	5-Mar
	1818 Platinum Triangle		—			16,663			51,905			68,568		125			16,693		52,000		68,693		10,493		2009	10-Aug
	The Residences at Bella Terra		—			25,000			—			25,000		122,185			25,037		122,148		147,185		3,072		2013	11-Oct
	ORANGE COUNTY, CA		193,873			382,674			377,759			760,433		287,747			408,191		639,989		1,048,180		235,713
	2000 Post Street		—			9,861			44,578			54,439		7,254			10,221		51,472		61,693		22,853		1987	Dec-98
	Birch Creek		—			4,365			16,696			21,061		6,150			5,026		22,185		27,211		12,068		1968	Dec-98
	Highlands Of Marin		—			5,996			24,868			30,864		25,534			7,095		49,303		56,398		23,816		2010	Dec-98
	Marina Playa		—			6,224			23,916			30,140		8,811			6,886		32,065		38,951		17,166		1971	Dec-98
	River Terrace		33,130			22,161			40,137			62,298		2,851			22,308		42,841		65,149		21,251		2005	5-Aug
	CitySouth		—			14,031			30,537			44,568		35,031			16,220		63,379		79,599		25,108		2012	5-Nov
	Bay Terrace		—			8,545			14,458			23,003		4,357			11,413		15,947		27,360		7,730		1962	5-Oct
	Highlands of Marin Phase II		—			5,353			18,559			23,912		11,038			5,753		29,197		34,950		11,297		2010	7-Oct
	Edgewater		—			30,657			83,872			114,529		2,861			30,675		86,715		117,390		29,050		2007	8-Mar
	Almaden Lake Village		27,000			594			42,515			43,109		4,367			729		46,747		47,476		15,391		1999	8-Jul
	388 Beale		—			14,253			74,104			88,357		3,836			14,274		77,919		92,193		11,688		1999	11-Apr
	2000 Post III		—			1,756			7,753			9,509		3,001			3,291		9,219		12,510		4,965		2006	Dec-98
	SAN FRANCISCO, CA		60,130			123,796			421,993			545,789		115,091			133,891		526,989		660,880		202,383
	Rosebeach		—			8,414			17,449			25,863		2,664			8,558		19,969		28,527		10,949		1970	4-Sep
	Ocean Villas		—			5,135			12,789			17,924		1,671			5,245		14,350		19,595		7,652		1965	4-Oct
	Tierra Del Rey		32,635			39,586			36,679			76,265		2,584			39,646		39,203		78,849		14,238		1999	7-Dec
	The Westerly		67,700			48,182			102,364			150,546		35,475			50,594		135,427		186,021		24,613		2013	10-Sep
	Pine@Sixth		—			5,805			6,305			12,110		12,723			6,251		18,582		24,833		14,797		2008	Dec-98
	Jefferson at Marina del Rey		—			55,651			—			55,651		88,695			61,189		83,157		144,346		23,239		2008	7-Sep
	LOS ANGELES, CA		100,335			162,773			175,586			338,359		143,812			171,483		310,688		482,171		95,488
	Arbor Terrace		—			1,453			11,995			13,448		3,541			1,813		15,176		16,989		8,479		1996	Mar-98
	Aspen Creek		10,819			1,178			9,116			10,294		2,602			1,451		11,445		12,896		5,876		1996	Dec-98
	Crowne Pointe		—			2,486			6,437			8,923		4,827			2,808		10,942		13,750		6,580		1987	Dec-98
	Hilltop		—			2,174			7,408			9,582		3,432			2,658		10,356		13,014		6,008		1985	Dec-98
	The Hawthorne		36,093			6,474			30,226			36,700		2,594			6,569		32,725		39,294		16,473		2003	5-Jul
	The Kennedy		—			6,179			22,307			28,486		1,593			6,232		23,847		30,079		11,244		2005	5-Nov
	Hearthstone at Merrill Creek		23,341			6,848			30,922			37,770		2,407			6,957		33,220		40,177		11,289		2000	8-May
	Island Square		—			21,284			89,389			110,673		3,318			21,401		92,590		113,991		29,209		2007	8-Jul
	Borgata		—			6,379			24,569			30,948		586			6,399		25,135		31,534		9,552		2001	7-May
	elements too		—			27,468			72,036			99,504		13,284			30,060		82,728		112,788		27,096		2010	10-Feb
	989elements		—			8,541			45,990			54,531		1,054			8,538		47,047		55,585		10,860		2006	9-Dec
	SEATTLE, WA		70,253			90,464			350,395			440,859		39,238			94,886		385,211		480,097		142,666
	Presidio at Rancho Del Oro		—			9,164			22,694			31,858		6,270			9,722		28,406		38,128		16,802		1987	4-Jun
	Villas at Carlsbad		—			6,517			10,718			17,235		2,059			6,722		12,572		19,294		6,607		1966	4-Oct
	13th & Market		34,780			10,300			—			10,300		60,847			10,305		60,842		71,147		628		2013	11-May
	SAN DIEGO, CA		34,780			25,981			33,412			59,393		69,176			26,749		101,820		128,569		24,037
						Initial Costs											Gross Amount at Which Carried at Close of Period
			Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
						Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
						Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
	Boronda Manor		—			1,946			8,982			10,928		9,126			3,145		16,909		20,054		7,952		1979	Dec-98
	Garden Court		—			888			4,188			5,076		5,123			1,491		8,708		10,199		4,203		1973	Dec-98
	Cambridge Court		—			3,039			12,883			15,922		13,910			5,197		24,635		29,832		12,143		1974	Dec-98
	Laurel Tree		—			1,304			5,115			6,419		5,577			2,131		9,865		11,996		4,904		1977	Dec-98
	The Pointe At Harden Ranch		—			6,388			23,854			30,242		24,885			9,816		45,311		55,127		21,627		1986	Dec-98
The Pointe At Northridge		—			2,044			8,028			10,072		9,451			3,242		16,281		19,523		8,239		1979	Dec-98
The Pointe At Westlake		—			1,329			5,334			6,663		5,883			2,129		10,417		12,546		4,854		1975	Dec-98
MONTEREY PENINSULA, CA		—			16,938			68,384			85,322		73,955			27,151		132,126		159,277		63,922
Verano at Rancho Cucamonga Town Square		46,471			13,557			3,645			17,202		52,994			22,995		47,201		70,196		28,367		2006	2-Oct
Windemere at Sycamore Highland		—			5,810			23,450			29,260		2,437			6,041		25,656		31,697		15,998		2001	2-Nov
INLAND EMPIRE, CA		46,471			19,367			27,095			46,462		55,431			29,036		72,857		101,893		44,365
Tualatin Heights		—			3,273			9,134			12,407		6,204			3,813		14,798		18,611		9,082		1989	Dec-98
Andover Park		16,818			2,916			16,995			19,911		7,783			3,150		24,544		27,694		14,770		1989	4-Sep
Hunt Club		18,323			6,014			14,870			20,884		5,620			6,351		20,153		26,504		12,502		1985	4-Sep
PORTLAND, OR		35,141			12,203			40,999			53,202		19,607			13,314		59,495		72,809		36,354
TOTAL WEST REGION		540,983			834,196			1,495,623			2,329,819		804,057			904,701		2,229,175		3,133,876		844,928
MID-ATLANTIC REGION
Dominion Middle Ridge		30,317			3,311			13,283			16,594		6,302			3,730		19,166		22,896		12,969		1990	Jun-96
Dominion Lake Ridge		20,712			2,366			8,387			10,753		5,649			2,842		13,560		16,402		9,348		1987	Feb-96
Presidential Greens		—			11,238			18,790			30,028		8,330			11,579		26,779		38,358		17,910		1938	2-May
The Whitmore		—			6,418			13,411			19,829		19,931			7,460		32,300		39,760		20,140		2008	2-Apr
Ridgewood		—			5,612			20,086			25,698		7,864			5,986		27,576		33,562		18,660		1988	2-Aug
Commons at Town Square		—			136			7,724			7,860		1,399			6,874		2,385		9,259		1,393		1971	3-Dec
Waterside Towers		—			874			38,209			39,083		11,828			26,396		24,515		50,911		15,623		1971	3-Dec
Waterside Townhomes		—			129			3,724			3,853		691			2,725		1,819		4,544		1,067		1971	3-Dec
Wellington Place at Olde Town		28,681			13,753			36,059			49,812		16,856			14,629		52,039		66,668		29,361		2008	5-Sep
Andover House		—			14,357			51,577			65,934		2,755			14,373		54,316		68,689		21,542		2004	7-Mar
Sullivan Place		—			1,137			103,676			104,813		4,352			1,235		107,930		109,165		38,559		2007	7-Dec
Circle Towers		70,328			32,815			107,051			139,866		9,199			32,994		116,071		149,065		37,847		1972	8-Mar
Delancey at Shirlington		—			21,606			66,765			88,371		1,441			21,621		68,191		89,812		22,662		2006/07	8-Mar
View 14		—			5,710			97,941			103,651		2,348			5,721		100,278		105,999		14,274		2009	11-Jun
Signal Hill		—			13,290			—			13,290		69,317			25,375		57,232		82,607		15,912		2010	7-Mar
Capitol View on 14th		—			31,393			—			31,393		91,966			31,393		91,966		123,359		5,217		2013	7-Sep
METROPOLITAN, D.C.		150,038			164,145			586,683			750,828		260,228			214,933		796,123		1,011,056		282,484
Dominion Kings Place		14,768			1,565			7,007			8,572		4,132			1,808		10,896		12,704		7,693		1983	Dec-92
Dominion At Eden Brook		—			2,361			9,384			11,745		6,308			2,944		15,109		18,053		11,307		1984	Dec-92
Ellicott Grove		—			2,920			9,099			12,019		22,626			5,278		29,367		34,645		21,159		2008	Jul-94
Dominion Constant Freindship		10,683			903			4,669			5,572		3,704			1,221		8,055		9,276		5,629		1990	May-95
Lakeside Mill		15,242			2,666			10,109			12,775		4,189			2,919		14,045		16,964		10,290		1989	Dec-99
Tamar Meadow		—			4,145			17,150			21,295		4,707			4,559		21,443		26,002		14,199		1990	2-Nov
Calvert’s Walk		—			4,408			24,692			29,100		6,436			4,660		30,876		35,536		18,463		1988	4-Mar
Arborview Apartments		—			4,653			23,952			28,605		7,191			5,146		30,650		35,796		18,972		1992	4-Mar
Liriope Apartments		—			1,620			6,791			8,411		1,149			1,646		7,914		9,560		4,770		1997	4-Mar
20 Lambourne		31,511			11,750			45,590			57,340		4,481			11,990		49,831		61,821		18,123		2003	8-Mar
Domain Brewers Hill		—			4,669			40,630			45,299		502			4,675		41,126		45,801		7,953		2009	10-Aug
BALTIMORE, MD		72,204			41,660			199,073			240,733		65,425			46,846		259,312		306,158		138,558
Dominion English Hills		—			1,979			11,524			13,503		8,224			2,873		18,854		21,727		11,134		1969/76	Dec-91
Gayton Pointe Townhomes		—			826			5,148			5,974		29,095			3,386		31,683		35,069		24,775		2007	Sep-95
					Initial Costs											Gross Amount at Which Carried at Close of Period
		Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
					Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
					Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
Waterside At Ironbridge		—			1,844			13,239			15,083		6,980			2,293		19,770		22,063		12,304		1987	Sep-97
Carriage Homes at Wyndham		—			474			30,997			31,471		7,389			3,780		35,080		38,860		22,093		1998	3-Nov
Legacy at Mayland		41,507			—			—			—		20,453			1,966		18,487		20,453		16,639		2007	Dec-91
RICHMOND, VA		41,507			5,123			60,908			66,031		72,141			14,298		123,874		138,172		86,945
Forest Lake At Oyster Point		—			780			8,862			9,642		8,723			1,388		16,977		18,365		12,294		1986	Aug-95
Woodscape		—			798			7,209			8,007		9,447			2,053		15,401		17,454		13,149		1974/76	Dec-87
Eastwind		—			155			5,317			5,472		6,186			656		11,002		11,658		8,749		1970	Apr-88
Dominion Waterside At Lynnhaven		—			1,824			4,107			5,931		6,072			2,262		9,741		12,003		7,240		1966	Aug-96
Heather Lake		—			617			3,400			4,017		9,926			1,205		12,738		13,943		11,714		1972/74	Mar-80
Dominion Yorkshire Downs		—			1,089			8,582			9,671		5,839			1,575		13,935		15,510		8,793		1987	Dec-97
NORFOLK, VA		—			5,263			37,477			42,740		46,193			9,139		79,794		88,933		61,939
Greens At Schumaker Pond		—			710			6,118			6,828		5,667			1,011		11,484		12,495		8,072		1988	May-95
OTHER MID-ATLANTIC		—			710			6,118			6,828		5,667			1,011		11,484		12,495		8,072
TOTAL MID-ATLANTIC REGION		263,749			216,901			890,259			1,107,160		449,654			286,227		1,270,587		1,556,814		577,998
SOUTHEAST REGION
Summit West		—			2,176			4,710			6,886		8,166			3,200		11,853		15,053		9,878		1972	Dec-92
The Breyley		—			1,780			2,458			4,238		16,895			3,292		17,841		21,133		15,476		2007	Sep-93
Lakewood Place		18,835			1,395			10,647			12,042		8,597			2,260		18,379		20,639		13,036		1986	Mar-94
Bay Meadow		—			2,893			9,254			12,147		9,924			4,220		17,851		22,071		12,779		2004	Dec-96
Cambridge Woods		—			1,791			7,166			8,957		8,082			2,574		14,465		17,039		10,086		1985	Jun-97
Sugar Mill Creek		—			2,242			7,553			9,795		6,567			2,720		13,642		16,362		8,401		1988	Dec-98
Inlet Bay		—			7,702			23,150			30,852		13,740			9,005		35,587		44,592		24,223		1988/89	3-Jun
MacAlpine Place		—			10,869			36,858			47,727		6,862			11,264		43,325		54,589		24,392		2001	4-Dec
The Vintage Lofts at West End		—			6,611			37,663			44,274		15,317			15,111		44,480		59,591		15,843		2009	9-Jul
Gallery at Bayport II		—			5,775			17,236			23,011		3,124			8,601		17,534		26,135		7,206		2008	6-Oct
Island Walk		—			7,231			19,897			27,128		11,342			5,032		33,438		38,470		20,797		1985/87	6-Jul
TAMPA, FL		18,835			50,465			176,592			227,057		108,616			67,279		268,395		335,674		162,117
Seabrook		—			1,846			4,155			6,001		7,724			2,680		11,045		13,725		8,598		2004	Feb-96
The Canopy Apartment Villas		—			2,895			6,456			9,351		22,188			5,415		26,124		31,539		21,758		2008	Mar-93
Altamira Place		15,640			1,533			11,076			12,609		19,642			3,318		28,933		32,251		23,111		2007	Apr-94
Regatta Shore		—			757			6,608			7,365		14,720			1,963		20,122		22,085		15,550		2007	Jun-94
Alafaya Woods		18,366			1,653			9,042			10,695		8,554			2,491		16,758		19,249		11,938		2006	Oct-94
Los Altos		22,308			2,804			12,349			15,153		9,689			3,904		20,938		24,842		13,324		2004	Oct-96
Lotus Landing		—			2,185			8,639			10,824		9,111			2,794		17,141		19,935		10,407		2006	Jul-97
Seville On The Green		—			1,282			6,498			7,780		6,484			1,686		12,578		14,264		8,054		2004	Oct-97
Ashton @ Waterford		23,778			3,872			17,538			21,410		3,364			4,162		20,612		24,774		12,156		2000	May-98
Arbors at Lee Vista		—			6,692			12,860			19,552		12,284			7,126		24,710		31,836		17,054		2007	6-Aug
The Place on Millenia Blvd		—			12,172			37,143			49,315		2,204			12,223		39,296		51,519		16,269		2007	8-Jan
ORLANDO, FL		80,092			37,691			132,364			170,055		115,964			47,762		238,257		286,019		158,219
Legacy Hill		—			1,148			5,867			7,015		8,460			1,721		13,754		15,475		10,377		1977	Nov-95
Hickory Run		—			1,469			11,584			13,053		9,295			2,086		20,262		22,348		12,690		1989	Dec-95
Carrington Hills		—			2,117			—			2,117		33,002			4,413		30,706		35,119		18,870		1999	Dec-95
Brookridge		—			708			5,461			6,169		4,311			1,118		9,362		10,480		6,288		1986	Mar-96
Breckenridge		—			766			7,714			8,480		4,093			1,222		11,351		12,573		7,249		1986	Mar-97
Colonnade		—			1,460			16,015			17,475		4,432			1,868		20,039		21,907		10,699		1998	Jan-99
The Preserve at Brentwood		22,527			3,182			24,674			27,856		5,693			3,483		30,066		33,549		18,574		1998	4-Jun
Polo Park		—			4,583			16,293			20,876		15,729			5,624		30,981		36,605		18,530		2008	6-May
NASHVILLE, TN		22,527			15,433			87,608			103,041		85,015			21,535		166,521		188,056		103,277
The Reserve and Park at Riverbridge		40,133			15,968			56,401			72,369		7,637			16,351		63,654		80,005		34,308		1999/2001	4-Dec
					Initial Costs											Gross Amount at Which Carried at Close of Period
		Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
					Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
					Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
OTHER FLORIDA		40,133			15,968			56,401			72,369		7,637			16,351		63,654		80,005		34,308
TOTAL SOUTHEAST REGION		161,587			119,557			452,965			572,522		317,232			152,927		736,827		889,754		457,921
NORTHEAST REGION
Garrison Square		—			5,591			91,027			96,618		5,176			5,603		96,191		101,794		18,059		1887/1990	10-Sep
Ridge at Blue Hills		23,509			6,039			34,869			40,908		752			6,078		35,582		41,660		6,867		2007	10-Sep
Inwood West		57,928			20,778			88,096			108,874		2,559			20,849		90,584		111,433		14,498		2006	11-Apr
14 North		—			10,961			51,175			62,136		2,827			10,994		53,969		64,963		9,118		2005	11-Apr
BOSTON, MA		81,437			43,369			265,167			308,536		11,314			43,524		276,326		319,850		48,542
10 Hanover Square		196,376			41,432			218,983			260,415		6,821			41,463		225,773		267,236		31,043		2005	11-Apr
21 Chelsea		—			36,399			107,154			143,553		8,316			36,399		115,470		151,869		14,118		2001	11-Aug
Rivergate		—			114,410			324,920			439,330		63,298			114,731		387,897		502,628		47,279		1985/2013	11-Jul
95 Wall Street		—			57,637			266,255			323,892		3,656			57,736		269,812		327,548		38,298		2008	11-Aug
NEW YORK, NY		196,376			249,878			917,312			1,167,190		82,091			250,329		998,952		1,249,281		130,738
TOTAL NORTHEAST REGION		277,813			293,247			1,182,479			1,475,726		93,405			293,853		1,275,278		1,569,131		179,280
SOUTHWEST REGION
THIRTY377		30,660			24,036			32,951			56,987		7,276			24,309		39,954		64,263		19,168		2007	6-Aug
Legacy Village		72,415			16,882			100,102			116,984		5,685			17,101		105,568		122,669		37,798		6/7/05	8-Mar
Garden Oaks		—			2,132			5,367			7,499		1,396			6,928		1,967		8,895		1,638		1979	7-Mar
Glenwood		—			7,903			554			8,457		1,643			8,150		1,950		10,100		1,146		1970	7-May
Talisker of Addison		—			10,440			634			11,074		1,784			10,841		2,017		12,858		1,593		1975	7-May
Springhaven		—			6,688			3,354			10,042		1,130			8,350		2,822		11,172		2,004		1977	7-Apr
Clipper Pointe		—			13,221			2,507			15,728		2,051			14,906		2,873		17,779		2,345		1978	7-May
Highlands of Preston		—			2,151			8,168			10,319		30,614			5,975		34,958		40,933		22,141		2008	Mar-98
DALLAS, TX		103,075			83,453			153,637			237,090		51,579			96,560		192,109		288,669		87,833
Barton Creek Landing		—			3,151			14,269			17,420		21,900			4,706		34,614		39,320		17,554		2010	2-Mar
Residences at the Domain		30,661			4,034			55,256			59,290		2,199			4,197		57,292		61,489		18,502		2007	8-Aug
Red Stone Ranch		19,961			5,084			17,646			22,730		1,140			5,114		18,756		23,870		2,180		2000	12-Apr
Lakeline Villas		15,432			4,148			16,869			21,017		645			4,157		17,505		21,662		2,030		2004	12-Apr
AUSTIN, TX		66,054			16,417			104,040			120,457		25,884			18,174		128,167		146,341		40,266
TOTAL SOUTHWEST REGION		169,129			99,870			257,677			357,547		77,463			114,734		320,276		435,010		128,099
TOTAL OPERATING COMMUNITIES		1,413,261			1,563,771			4,279,003			5,842,774		1,741,811			1,752,442		5,832,143		7,584,585		2,188,226
REAL ESTATE UNDER DEVELOPMENT
Los Alisos		—			17,298			—			17,298		63,325			16,386		64,237		80,623		300
Mission Bay		—			23,625			—			23,625		117,643			23,653		117,615		141,268		116
DelRay Tower		—			297			12,786			13,083		66,980			9,447		70,616		80,063		—
Pier 4		—			24,584			—			24,584		54,418			24,584		54,418		79,002		—
Beach Walk		—			12,878			—			12,878		15,179			13,007		15,050		28,057		—
Domain College Park		28,816			7,300			—			7,300		51,100			7,306		51,094		58,400		995
TOTAL REAL ESTATE UNDER DEVELOPMENT		28,816			85,982			12,786			98,768		368,645			94,383		373,030		467,413		1,411
LAND
2919 Wilshire		—			6,773			527			7,300		503			6,773		1,030		7,803		317
3032 Wilshire		—			9,963			788			10,751		990			9,963		1,778		11,741		495
3033 Wilshire		—			11,055			—			11,055		7,249			11,049		7,255		18,304		—
7 Harcourt		—			884			—			884		4,176			884		4,176		5,060		420
Parkers Landing II		—			1,710			—			1,710		762			1,511		961		2,472		—
Presidio		—			1,524			—			1,524		921			1,300		1,145		2,445		—
Waterside		—			11,862			93			11,955		129			11,862		222		12,084		249
Vitruvian		—			4,325			1,360			5,685		7,683			11,150		2,218		13,368		1,964
TOTAL LAND		—			48,096			2,768			50,864		22,413			54,492		18,785		73,277		3,445
REAL ESTATE HELD FOR DISPOSITION
Grandview DCO		—			7,266			9,702			16,968		(249		)	10,751		5,969		16,720		6,568
TOTAL HELD FOR DISPOSITION		—			7,266			9,702			16,968		(249		)	10,751		5,969		16,720		6,568
					Initial Costs											Gross Amount at Which Carried at Close of Period
		Encumbrances			Land and			Buildings			Total Initial		Costs of Improvements Capitalized			Land and		Buildings &		Total		Accumulated		Date of	Date
					Land			and			Acquisition		Subsequent			Land		Buildings		Carrying		Depreciation		Construction(a)	Acquired
					Improvements			Improvements			Costs		to Acquisition Costs			Improvements		Improvements		Value
COMMERCIAL
Hanover Village		—			1,624			—			1,624		—			1,104		520		1,624		553
Circle Towers Office Bldg		—			1,407			4,498			5,905		1,518			1,380		6,043		7,423		1,789
Brookhaven Shopping Center		—			4,943			7,093			12,036		9,487			7,793		13,730		21,523		6,278
Bellevue Plaza retail		—			24,377			7,517			31,894		276			29,920		2,250		32,170		499
TOTAL COMMERCIAL		—			32,351			19,108			51,459		11,281			40,197		22,543		62,740		9,119
Other (b)		—			—			—			—		3,242			—		3,242		3,242		25
TOTAL CORPORATE		—			—			—			—		3,242			—		3,242		3,242		25
TOTAL COMMERCIAL & CORPORATE		—			32,351			19,108			51,459		14,523			40,197		25,785		65,982		9,144
TOTAL REAL ESTATE OWNED		$	1,442,077		$	1,737,466		$	4,323,367		$	6,060,833	$	2,147,143		$	1,952,265	$	6,255,712	$	8,207,977	$	2,208,794
(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 $7.5 billion at December 31, 2013.
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):
		2013			2012			2011
Balance at beginning of the year		$	8,055,828		$	8,074,471		$	6,881,347
Real estate acquired		—			141,648			1,590,514
Capital expenditures and development		452,057			422,480			189,711
Real estate sold		(70,687		)	(559,154		)	(587,101		)
Real estate contributed to joint ventures		(356,303		)	—			—
Consolidation of joint venture assets		129,437			—			—
Retirement of fully depreciated assets		—			(13,945		)	—
Impairment of assets, including hurricane-related impairments		(2,355		)	(9,672		)	—
Balance at end of the year		$	8,207,977		$	8,055,828		$	8,074,471
The following is a reconciliation of total accumulated depreciation for real estate owned at December 31:
		2013			2012			2011
Balance at beginning of the year		$	1,924,682		$	1,831,727		$	1,638,326
Depreciation expense for the year		339,326			340,800			341,925
Accumulated depreciation on sales		(34,794		)	(233,207		)	(148,524		)
Accumulated depreciation on real estate contributed to joint ventures		(20,662		)	—			—
Accumulated depreciation on assets of consolidated joint ventures		1,374			—			—
Accumulated depreciation on retirements of fully depreciated assets		(1,132		)	(13,945		)	—
Write off of accumulated depreciation on hurricane-related impaired assets		—			(693		)	—
Balance at end of year		$	2,208,794		$	1,924,682		$	1,831,727
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		$	50,358		$	20,476		$	28,538		$	49,014	$	12,291		$	20,963	$	40,342	$	61,305	$	24,805	2003	3-Jun
	27 Seventy Five Mesa Verde		30,660			99,329			110,644			209,973		83,889			107,578		186,284		293,862		57,965		2013	4-Oct
	Pacific Shores		34,112			7,345			22,624			29,969		8,808			7,721		31,056		38,777		18,492		2003	3-Jun
	Huntington Vista		27,972			8,055			22,486			30,541		6,972			8,312		29,201		37,513		17,615		1970	3-Jun
	Missions at Back Bay		—			229			14,129			14,358		2,045			10,778		5,625		16,403		3,772		1969	3-Dec
	Coronado at Newport — North		—			62,516			46,082			108,598		23,596			66,683		65,511		132,194		38,108		2000	4-Oct
	Huntington Villas		50,771			61,535			18,017			79,552		6,378			62,096		23,834		85,930		14,471		1972	4-Sep
	Vista Del Rey		—			10,670			7,080			17,750		1,908			10,819		8,839		19,658		5,270		1969	4-Sep
	Coronado South		—			58,785			50,067			108,852		16,881			59,183		66,550		125,733		36,990		2000	5-Mar
	ORANGE COUNTY, CA		193,873			328,940			319,667			648,607		162,768			354,133		457,242		811,375		217,488
	2000 Post Street		—			9,861			44,578			54,439		7,254			10,221		51,472		61,693		22,853		1987	Dec-98
	Birch Creek		—			4,365			16,696			21,061		6,150			5,026		22,185		27,211		12,068		1968	Dec-98
	Highlands Of Marin		—			5,996			24,868			30,864		25,534			7,095		49,303		56,398		23,816		2010	Dec-98
	Marina Playa		—			6,224			23,916			30,140		8,811			6,886		32,065		38,951		17,166		1971	Dec-98
	River Terrace		33,130			22,161			40,137			62,298		2,851			22,308		42,841		65,149		21,251		2005	5-Aug
	CitySouth		—			14,031			30,537			44,568		35,031			16,220		63,379		79,599		25,108		2012	5-Nov
	Bay Terrace		—			8,545			14,458			23,003		4,357			11,413		15,947		27,360		7,730		1962	5-Oct
	Highlands of Marin Phase II		—			5,353			18,559			23,912		11,038			5,753		29,197		34,950		11,297		2010	7-Oct
	Edgewater		—			30,657			83,872			114,529		2,861			30,675		86,715		117,390		29,050		2007	8-Mar
	Almaden Lake Village		27,000			594			42,515			43,109		4,367			729		46,747		47,476		15,391		1999	8-Jul
	SAN FRANCISCO, CA		60,130			107,787			340,136			447,923		108,254			116,326		439,851		556,177		185,730
	Rosebeach		—			8,414			17,449			25,863		2,664			8,558		19,969		28,527		10,949		1970	4-Sep
	Ocean Villas		—			5,135			12,789			17,924		1,671			5,245		14,350		19,595		7,652		1965	4-Oct
	Tierra Del Rey		32,635			39,586			36,679			76,265		2,584			39,646		39,203		78,849		14,238		1999	7-Dec
	LOS ANGELES, CA		32,635			53,135			66,917			120,052		6,919			53,449		73,522		126,971		32,839
	Crowne Pointe		—			2,486			6,437			8,923		4,827			2,808		10,942		13,750		6,580		1987	Dec-98
	Hilltop		—			2,174			7,408			9,582		3,432			2,658		10,356		13,014		6,008		1985	Dec-98
	The Kennedy		—			6,179			22,307			28,486		1,593			6,232		23,847		30,079		11,244		2005	5-Nov
	Hearthstone at Merrill Creek		23,341			6,848			30,922			37,770		2,407			6,957		33,220		40,177		11,289		2000	8-May
	Island Square		—			21,284			89,389			110,673		3,318			21,401		92,590		113,991		29,209		2007	8-Jul
	SEATTLE, WA		23,341			38,971			156,463			195,434		15,577			40,056		170,955		211,011		64,330
	Presidio at Rancho Del Oro		—			9,164			22,694			31,858		6,270			9,722		28,406		38,128		16,802		1987	4-Jun
	Villas at Carlsbad		—			6,517			10,718			17,235		2,059			6,722		12,572		19,294		6,607		1966	4-Oct
	SAN DIEGO, CA		—			15,681			33,412			49,093		8,329			16,444		40,978		57,422		23,409
	Boronda Manor		—			1,946			8,982			10,928		9,126			3,145		16,909		20,054		7,952		1979	Dec-98
	Garden Court		—			888			4,188			5,076		5,123			1,491		8,708		10,199		4,203		1973	Dec-98
	Cambridge Court		—			3,039			12,883			15,922		13,910			5,197		24,635		29,832		12,143		1974	Dec-98
	Laurel Tree		—			1,304			5,115			6,419		5,577			2,131		9,865		11,996		4,904		1977	Dec-98
	The Pointe At Harden Ranch		—			6,388			23,854			30,242		24,885			9,816		45,311		55,127		21,627		1986	Dec-98
	The Pointe At Northridge		—			2,044			8,028			10,072		9,451			3,242		16,281		19,523		8,239		1979	Dec-98
	The Pointe At Westlake		—			1,329			5,334			6,663		5,883			2,129		10,417		12,546		4,854		1975	Dec-98
	MONTEREY PENINSULA, CA		—			16,938			68,384			85,322		73,955			27,151		132,126		159,277		63,922
	Verano at Rancho Cucamonga Town Square		46,471			13,557			3,645			17,202		52,994			22,995		47,201		70,196		28,367		2006	2-Oct
	INLAND EMPIRE, CA		46,471			13,557			3,645			17,202		52,994			22,995		47,201		70,196		28,367
	Tualatin Heights		—			3,273			9,134			12,407		6,204			3,813		14,798		18,611		9,082		1989	Dec-98
	Andover Park		16,818			2,916			16,995			19,911		7,783			3,150		24,544		27,694		14,770		1989	4-Sep
	Hunt Club		18,323			6,014			14,870			20,884		5,620			6,351		20,153		26,504		12,502		1985	4-Sep
	PORTLAND, OR		35,141			12,203			40,999			53,202		19,607			13,314		59,495		72,809		36,354
	TOTAL WEST REGION		391,591			587,212			1,029,623			1,616,835		448,403			643,868		1,421,370		2,065,238		652,439
						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
	MID-ATLANTIC REGION
	The Whitmore		—			6,418			13,411			19,829		19,931			7,460		32,300		39,760		20,140		2008	2-Apr
	Ridgewood		—			5,612			20,086			25,698		7,864			5,986		27,576		33,562		18,660		1988	2-Aug
	Wellington Place at Olde Town		28,681			13,753			36,059			49,812		16,856			14,629		52,039		66,668		29,361		2008	5-Sep
	Andover House		—			14,357			51,577			65,934		2,755			14,373		54,316		68,689		21,542		2004	7-Mar
	Sullivan Place		—			1,137			103,676			104,813		4,352			1,235		107,930		109,165		38,559		2007	7-Dec
	Circle Towers		70,328			32,815			107,051			139,866		9,199			32,994		116,071		149,065		37,847		1972	8-Mar
	Delancey at Shirlington		—			21,606			66,765			88,371		1,441			21,621		68,191		89,812		22,662		2006/07	8-Mar
	METROPOLITAN D.C.		99,009			95,698			398,625			494,323		62,398			98,298		458,423		556,721		188,771
Lakeside Mill		15,242			2,666			10,109			12,775		4,189			2,919		14,045		16,964		10,290		1989	Dec-99
Tamar Meadow		—			4,145			17,150			21,295		4,707			4,559		21,443		26,002		14,199		1990	2-Nov
Calvert’s Walk		—			4,408			24,692			29,100		6,436			4,660		30,876		35,536		18,463		1988	4-Mar
Liriope Apartments		—			1,620			6,791			8,411		1,149			1,646		7,914		9,560		4,770		1997	4-Mar
20 Lambourne		31,511			11,750			45,590			57,340		4,481			11,990		49,831		61,821		18,123		2003	8-Mar
BALTIMORE, MD		46,753			24,589			104,332			128,921		20,962			25,774		124,109		149,883		65,845
TOTAL MID-ATLANTIC REGION		145,762			120,287			502,957			623,244		83,360			124,072		582,532		706,604		254,616
SOUTHEAST REGION
Sugar Mill Creek		—			2,242			7,553			9,795		6,567			2,720		13,642		16,362		8,401		1988	Dec-98
Inlet Bay		—			7,702			23,150			30,852		13,740			9,005		35,587		44,592		24,223		1988/89	3-Jun
MacAlpine Place		—			10,869			36,858			47,727		6,862			11,264		43,325		54,589		24,392		2001	4-Dec
TAMPA, FL		—			20,813			67,561			88,374		27,169			22,989		92,554		115,543		57,016
Legacy Hill		—			1,148			5,867			7,015		8,460			1,721		13,756		15,477		10,377		1977	Nov-95
Hickory Run		—			1,469			11,584			13,053		9,295			2,086		20,262		22,348		12,690		1989	Dec-95
Carrington Hills		—			2,117			—			2,117		33,002			4,413		30,706		35,119		18,870		1999	Dec-95
Brookridge		—			708			5,461			6,169		4,311			1,118		9,362		10,480		6,288		1986	Mar-96
Breckenridge		—			766			7,714			8,480		4,093			1,222		11,351		12,573		7,249		1986	Mar-97
Polo Park		—			4,583			16,293			20,876		15,729			5,624		30,981		36,605		18,530		2008	6-May
NASHVILLE, TN		—			10,791			46,919			57,710		74,890			16,184		116,418		132,602		74,004
The Reserve and Park at Riverbridge		40,133			15,968			56,401			72,369		7,637			16,351		63,654		80,005		34,308		1999/2001	4-Dec
OTHER FLORIDA		40,133			15,968			56,401			72,369		7,637			16,351		63,654		80,005		34,308
TOTAL SOUTHEAST REGION		40,133			47,572			170,881			218,453		109,696			55,524		272,626		328,150		165,328
NORTHEAST REGION
Inwood West		57,928			20,778			88,096			108,874		2,559			20,849		90,584		111,433		14,498		2006	11-Apr
14 North		—			10,961			51,175			62,136		2,827			10,994		53,969		64,963		9,118		2005	11-Apr
BOSTON, MA		57,928			31,739			139,271			171,010		5,386			31,843		144,553		176,396		23,616
10 Hanover Square		196,376			41,432			218,983			260,415		6,821			41,463		225,773		267,236		31,043		2005	11-Apr
95 Wall Street		—			57,637			266,255			323,892		3,656			57,736		269,812		327,548		38,298		2008	11-Aug
NEW YORK, NY		196,376			99,069			485,238			584,307		10,477			99,199		495,585		594,784		69,341
TOTAL NORTHEAST REGION		254,304			130,808			624,509			755,317		15,863			131,042		640,138		771,180		92,957
SOUTHWEST REGION
THIRTY377		30,660			24,036			32,951			56,987		7,276			24,309		39,956		64,265		19,168		2007	6-Aug
Legacy Village		72,415			16,882			100,102			116,984		5,685			17,101		105,568		122,669		37,798		6/7/05	8-Mar
DALLAS, TX		103,075			40,918			133,053			173,971		12,961			41,410		145,524		186,934		56,966
Barton Creek Landing		—			3,151			14,269			17,420		21,900			4,706		34,611		39,317		17,554		2010	2-Mar
AUSTIN, TX		—			3,151			14,269			17,420		21,900			4,706		34,611		39,317		17,554
TOTAL SOUTHWEST REGION		103,075			44,069			147,322			191,391		34,861			46,116		180,135		226,251		74,520
TOTAL OPERATING COMMUNITIES		934,865			929,948			2,475,292			3,405,240		692,183			1,000,622		3,096,801		4,097,423		1,239,860
REAL ESTATE UNDER DEVELOPMENT
DelRey Tower		—			297			12,786			13,083		66,980			9,447		70,616		80,063		—
TOTAL REAL ESTATE UNDER DEVELOPMENT		—			297			12,786			13,083		66,980			9,447		70,616		80,063		—
LAND
Presidio		—			1,524			—			1,524		921			2,445		—		2,445		—
TOTAL LAND		—			1,524			—			1,524		921			2,445		—		2,445		—
					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
TOTAL COMMERCIAL		—			1,407			4,498			5,905		1,518			1,380		6,043		7,423		1,714
Other (b)		—			—			—			—		1,126			—		1,126		1,126		—
TOTAL CORPORATE		—			—			—			—		1,126			—		1,126		1,126		—
TOTAL COMMERCIAL & CORPORATE		—			1,407			4,498			5,905		2,644			1,380		7,169		8,549		1,714
TOTAL REAL ESTATE OWNED		$	934,865		$	933,176		$	2,492,576		$	3,425,752	$	762,728		$	1,013,894	$	3,174,586	$	4,188,480	$	1,241,574
(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 $3.5 billion at December 31, 2011.
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):
		2013			2012			2011
Balance at beginning of the year		$	4,182,920		$	4,205,298		$	3,706,184
Real estate acquired		—			—			758,707
Capital expenditures and development		151,002			115,355			63,191
Real estate sold		(70,687		)	(116,166		)	(322,784		)
Real estate transferred to the General Partner		(74,755		)	—			—
Retirement of fully depreciated asset		—			(13,945		)	—
Hurricane-related impairment of assets		—			(7,622		)	—
Balance at end of year		$	4,188,480		$	4,182,920		$	4,205,298
The following is a reconciliation of total accumulated depreciation for real estate owned at December 31:
		2013			2012			2011
Balance at beginning of the year		$	1,097,133		$	976,358		$	884,083
Depreciation expense for the year		179,404			189,362			181,085
Accumulated depreciation on sales		(34,794		)	(54,085		)	(88,810		)
Accumulated depreciation on retirements of fully depreciated asset		—			(13,945		)	—
Accumulated depreciation on property transferred to the General Partner		(169		)	—			—
Write off of accumulated depreciation on hurricane-related impaired assets		—			(557		)	—
Balance at end of year		$	1,241,574		$	1,097,133		$	976,358

IncomeLoss_Per_Share_UNITED_DO

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Notes)	12 Months Ended
	Dec. 31, 2013
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):
		Years Ended December 31,
		2013				2012			2011
	Numerator for income/(loss) per share:
	Income/(loss) from continuing operations	$	2,340			$	(46,305	)	$	(126,869	)
	(Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership	48				2,089			4,937
	(Income)/loss from continuing operations attributable to noncontrolling interests	60				(140		)	(167		)
	Income/(loss) from continuing operations attributable to UDR, Inc.	2,448				(44,356		)	(122,099		)
	Distributions to preferred stockholders - Series E (Convertible)	(3,724		)		(3,724		)	(3,724		)
	Distributions to preferred stockholders - Series G	—				(2,286		)	(5,587		)
	Premium on preferred stock redemption or repurchases, net	—				(2,791		)	(175		)
	Income/(loss) from continuing operations attributable to common stockholders	$	(1,276	)		$	(53,157	)	$	(131,585	)
	Income/(loss) from discontinued operations, net of tax	$	43,942			$	266,608		$	147,454
	(Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership	(1,578		)		(10,075		)	(5,332		)
	Income/(loss) from discontinued operations attributable to common stockholders	$	42,364			$	256,533		$	142,122
	Net income/(loss) attributable to common stockholders	$	41,088			$	203,376		$	10,537
	Denominator for income/(loss) per share - basic and diluted:
	Weighted average common shares outstanding	250,684				239,482			202,573
	Non-vested restricted stock awards	(715		)		(631		)	(1,279		)
	Denominator for income/(loss) per share - basic and diluted	249,969				238,851			201,294
	Income/(loss) per weighted average common share - basic and diluted:
	Income/(loss) from continuing operations attributable to common stockholders	$	(0.01	)		$	(0.22	)	$	(0.65	)
	Income/(loss) from discontinued operations attributable to common stockholders	$	0.17			$	1.07		$	0.71
	Net income/(loss) attributable to common stockholders	$	0.16			$	0.85		$	0.05
	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, 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.
	During the years ended December 31, 2013, 2012 and 2011, the effect of the conversion of the OP Units, convertible preferred stock, stock options and restricted stock is not dilutive, and is therefore 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, 2013, 2012, and 2011 (shares in thousands):
		Years Ended December 31,
		2013			2012			2011
	OP Units	9,337			9,411			7,602
	Preferred Stock	3,036			3,036			3,036
	Stock options and unvested restricted stock	1,584			1,361			2,154
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, 2013, 2012, and 2011, 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 9, 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):
		Years Ended December 31,
		2013				2012			2011
	Numerator for income/(loss) per OP Unit — basic and diluted:
	Income/(loss) from continuing operations	$	32,766			$	(13,309	)	$	(40,744	)
	(Income)/loss from continuing operations attributable to noncontrolling interests	(4,114		)		(100		)	84
	Income/(loss) from continuing operations attributable to OP unitholders	$	28,652			$	(13,409	)	$	(40,660	)
	Income/(loss) from discontinued operations	$	45,176			$	57,643		$	70,973
	(Income)/loss from discontinued operations attributable to noncontrolling interests	(452		)		(252		)	(154		)
	Income/(loss) from discontinued operations attributable to OP unitholders	$	44,724			$	57,391		$	70,819
	Net income/(loss)	$	77,942			$	44,334		$	30,229
	Net (income)/loss attributable to noncontrolling interests	(4,566		)		(352		)	(70		)
	Net income/(loss) attributable to OP unitholders	$	73,376			$	43,982		$	30,159
	Denominator for income/(loss) per OP Unit — basic and diluted:
	Weighted average OP Units outstanding — basic and diluted	184,196				184,281			182,448
	Income/(loss) per weighted average OP Unit — basic and diluted:
	Income/(loss) from continuing operations attributable to OP unitholders	$	0.16			$	(0.07	)	$	(0.22	)
	Income/(loss) from discontinued operations attributable to OP unitholders	$	0.24			$	0.31		$	0.39
	Net income/(loss) attributable to OP unitholders	$	0.4			$	0.24		$	0.17

Significant_Accounting_Policie2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-10, Disclosures about Offsetting Assets and Liabilities. The objective of this update is to provide enhanced disclosures that will enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position. This included the effect or potential effect of rights of setoff associated with an entity’s recognized assets and recognized liabilities within the scope of this update. The amendments require enhanced disclosures by requiring improved information about financial instruments and derivative instruments that are either 1) offset on the balance sheet in accordance with the “Offsetting Guidance” in ASC 210-20-45 or ASC 815-10-45 (collectively, the offsetting guidance) or 2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether they are offset in accordance with the “Offsetting Guidance”. The amendments, which were adopted by the Company on January 1, 2013, impacted the Company’s disclosures related to its derivative activities. (See Note 13, Derivatives and Hedging Activity.) The new guidance did not have any impact on the Company’s consolidated financial position, results of operations, or cash flows.
	In February 2012, the FASB issued ASU No. 2013-02, Other Comprehensive Income (Topic 220) to require preparers to report, in one place, information about reclassifications out of accumulated other comprehensive income (“AOCI”). For significant items reclassified out of AOCI to net income in their entirety in the same reporting period, reporting (either on the face of the statement where net income is presented or in the notes thereto) is required about the effect of the reclassifications on the respective line items in the statement where net income is presented. For items that are not reclassified to net income in their entirety in the same reporting period, a cross reference to other existing disclosures is required in the notes. The amendments, which were adopted by the Company on January 1, 2013, did not have any impact on the Company's consolidated financial position, results of operations, or cash flows. The accompanying consolidated financial statements include the required disclosures in the Consolidated Statements of Comprehensive Income/(Loss) or in the notes thereto for each of the three years in the period ended December 31, 2013.
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. As of December 31, 2013 and 2012, the amount of our net intangible assets, which are reflected in Other Assets in the Consolidated Balance Sheets, was $9.0 million and $11.9 million, respectively. As of December 31, 2013 and 2012, the amount of our net intangible liabilities, which are reflected in Accounts Payable, Accrued Expenses, and Other Liabilities in the Consolidated Balance Sheets, was $4.4 million and $5.2 million. The balances are being amortized over the remaining life of the respective intangible.
	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, 2013, 2012, and 2011 were $11.1 million, $10.0 million and $10.0 million, respectively. During the years ended December 31, 2013, 2012, and 2011, total interest capitalized was $29.4 million, $26.4 million, and $13.0 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, 2013 and 2012 (dollars in thousands):
		Interest rate at December 31, 2013		December 31, 2013		December 31, 2012
	Note due March 2014 (a)	3.67	%	$	40,800	$	—
	Note due October 2014 - related party (b)	—		—		24,481
	Note due February 2017 (c)	10	%	14,580		13,200
	Note due July 2017 (d)	8	%	1,400		100
	Note due June 2022 (net of discount of $247 and $275) (e)	7	%	26,253		26,225
	Total notes receivable, net			$	83,033	$	64,006
	(a) In conjunction with the sale of its 95% interest in the Lodge at Stoughton, one of its unconsolidated joint ventures, the Company provided the buyer with a $40.8 million three-month bridge loan at LIBOR plus a spread of 350 basis points with two three-month extension options at increased rates. For additional information on this transaction see Note 5, Joint Ventures and Partnerships.
	(b) As of December 31, 2012, the Company had a $24.5 million unsecured note receivable with one of its unconsolidated joint ventures. In December 2013, the outstanding balance was paid off in connection with the sale of the Company’s 95% interest in the joint venture. (See footnote (a) above and Note 5, Joint Ventures and Partnerships, for additional information on this transaction.)
	(c) The Company has a secured note receivable with an unaffiliated third party with an aggregate commitment of $14.6 million, which bears an interest rate of 10.00% per annum. During the year ended December 31, 2013, the Company loaned an additional $1.4 million under this note. 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).
	(d) 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. During the year ended December 31, 2013, the Company loaned an additional $1.3 million under the note. 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).
	(e) In 2012, the Company purchased mezzanine debt securing a mortgage on a class A community in West Los Angeles, California. The $26.5 million loan was purchased at a yield of 7.25% and bears a coupon rate of 7.00%. Interest payments are due monthly and the note is due June 2022. The discount is amortized using the effective interest method.
	During the years ended December 31, 2013, 2012 and 2011, the Company recognized $4.1 million, $2.7 million and $646,000 of interest income, net of accretion, from these notes receivable, of which $765,000, $281,000 and $0, respectively, were related party interest income. Interest income is included in Interest and Other Income/(Expense), Net on the Consolidated Statements of Operations.
Marketable Securities	'
	Marketable Securities
	During the year ended December 31, 2011, the Company sold marketable securities for $3.5 million, resulting in a realized gain of $3.1 million, which is included in Interest and Other Income/(Expense), Net on the Consolidated Statements of Operations. The cost of securities sold was based on the specific identification method. Unrealized gains of $3.5 million were reclassified out of accumulated other comprehensive income/(loss) into earnings during the year ended December 31, 2011. The marketable securities, which represented common stock in a publicly held company, were classified as “available-for-sale,” and were carried at fair value with unrealized gains and losses reported as a component of other comprehensive income/(loss).
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 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, 2013, 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
	Interests in the Operating Partnership held by limited partners are represented by Operating Partnership units (“OP Units”). The income is allocated to holders of OP Units based upon net income available to common stockholders and the weighted average number of OP Units outstanding to total common shares plus OP 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 agreement.
	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 Amended and Restated Agreement of Limited Partnership of the Operating Partnership (the “Operating Partnership Agreement”), provided that such OP Units have been outstanding for at least one year. UDR, as the 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 the Company for each OP Unit), as defined in the Operating Partnership Agreement. 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”), primarily those engaged in development activities.
	Income taxes for our TRS, RE3, 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, 2013, UDR recorded a net income tax receivable of $1.3 million and a net deferred tax asset of $32.3 million (net of a valuation allowance of $1.3 million), which are classified in Other Assets on the Consolidated Balance Sheets.
	Prior to 2012, RE3 had a history of losses and, as a result, historically recognized a valuation allowance for net deferred tax assets.  Each quarter, the Company evaluates the need to retain all or a portion of the valuation allowance on its net deferred tax assets. In 2012, the Company determined that it was more likely than not that the deferred tax assets, including any remaining net operating loss carry forward, would be realized. In making this determination, the Company analyzed, among other things, its recent history of earnings from sales of depreciable property, forecasts of future earnings and its cumulative earnings for the last twelve quarters. The reversal of the valuation allowance resulted in an income tax benefit of $44.4 million during the year ended December 31, 2012, $21.5 million of which is reported in continuing operations and included within Tax Benefit, Net in the Consolidated Statements of Operations, and $22.9 million of which is included within Income/(Loss) from Discontinued Operations, Net of Tax in the Consolidated Statements of Operations.
	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 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 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, 2013. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2010 through 2012 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
	Under GAAP, the results of operations for those properties sold during the year or classified as held for sale at the end of the current year are 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 4, Discontinued Operations and Assets Held for Sale, for further discussion).
Earnings Per Share, Policy [Policy Text Block]	'
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 General and Administrative
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.
Preferred Share Redemption and Repurchases	'
	Preferred Share Redemption and Repurchases
	During the year ended December 31, 2012, the Company completed the redemption of all outstanding shares of its 6.75% Series G Cumulative Redeemable Preferred Stock. A total of 3,264,362 shares of the Series G Preferred Stock was redeemed at a redemption price of $25 per share in cash, plus accrued and unpaid dividends to the redemption date for a total cost of $82.1 million.
	When redeeming or repurchasing preferred stock, the Company recognizes share issuance costs as a charge to the preferred stock on a pro rata basis to the total costs incurred for the preferred stock as well as any premium or discount on the redemption or repurchase. In connection with the redemption of the Series G Preferred Stock, the Company recognized a (decrease)/increase in net income/(loss) attributable to common stockholders of $(2.8) million, and $(175,000) for the years ended December 31, 2012, and 2011, respectively, which is reported in Premium on Preferred Stock Redemption or Repurchases, Net on the Consolidated Statements of Operations.
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, 2013, 2012, and 2011, 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 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, 2013, 2012, and 2011 was $250,000, $80,000, and $(404,000), 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, 2013, 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_Policie3

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Policies)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-10, Disclosures about Offsetting Assets and Liabilities. The objective of this update is to provide enhanced disclosures that will enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position. This included the effect or potential effect of rights of setoff associated with an entity’s recognized assets and recognized liabilities within the scope of this update. The amendments require enhanced disclosures by requiring improved information about financial instruments and derivative instruments that are either 1) offset on the balance sheet in accordance with the “Offsetting Guidance” in ASC 210-20-45 or ASC 815-10-45 (collectively, the offsetting guidance) or 2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether they are offset in accordance with the “Offsetting Guidance”. The amendments, which were adopted by the Company on January 1, 2013, impacted the Company’s disclosures related to its derivative activities. (See Note 13, Derivatives and Hedging Activity.) The new guidance did not have any impact on the Company’s consolidated financial position, results of operations, or cash flows.
	In February 2012, the FASB issued ASU No. 2013-02, Other Comprehensive Income (Topic 220) to require preparers to report, in one place, information about reclassifications out of accumulated other comprehensive income (“AOCI”). For significant items reclassified out of AOCI to net income in their entirety in the same reporting period, reporting (either on the face of the statement where net income is presented or in the notes thereto) is required about the effect of the reclassifications on the respective line items in the statement where net income is presented. For items that are not reclassified to net income in their entirety in the same reporting period, a cross reference to other existing disclosures is required in the notes. The amendments, which were adopted by the Company on January 1, 2013, did not have any impact on the Company's consolidated financial position, results of operations, or cash flows. The accompanying consolidated financial statements include the required disclosures in the Consolidated Statements of Comprehensive Income/(Loss) or in the notes thereto for each of the three years in the period ended December 31, 2013.
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. As of December 31, 2013 and 2012, the amount of our net intangible assets, which are reflected in Other Assets in the Consolidated Balance Sheets, was $9.0 million and $11.9 million, respectively. As of December 31, 2013 and 2012, the amount of our net intangible liabilities, which are reflected in Accounts Payable, Accrued Expenses, and Other Liabilities in the Consolidated Balance Sheets, was $4.4 million and $5.2 million. The balances are being amortized over the remaining life of the respective intangible.
	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, 2013, 2012, and 2011 were $11.1 million, $10.0 million and $10.0 million, respectively. During the years ended December 31, 2013, 2012, and 2011, total interest capitalized was $29.4 million, $26.4 million, and $13.0 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.
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
	Under GAAP, the results of operations for those properties sold during the year or classified as held for sale at the end of the current year are 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 4, Discontinued Operations and Assets Held for Sale, for further discussion).
Earnings per Operating Partnership Unit	'
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”), primarily those engaged in development activities.
	Income taxes for our TRS, RE3, 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, 2013, UDR recorded a net income tax receivable of $1.3 million and a net deferred tax asset of $32.3 million (net of a valuation allowance of $1.3 million), which are classified in Other Assets on the Consolidated Balance Sheets.
	Prior to 2012, RE3 had a history of losses and, as a result, historically recognized a valuation allowance for net deferred tax assets.  Each quarter, the Company evaluates the need to retain all or a portion of the valuation allowance on its net deferred tax assets. In 2012, the Company determined that it was more likely than not that the deferred tax assets, including any remaining net operating loss carry forward, would be realized. In making this determination, the Company analyzed, among other things, its recent history of earnings from sales of depreciable property, forecasts of future earnings and its cumulative earnings for the last twelve quarters. The reversal of the valuation allowance resulted in an income tax benefit of $44.4 million during the year ended December 31, 2012, $21.5 million of which is reported in continuing operations and included within Tax Benefit, Net in the Consolidated Statements of Operations, and $22.9 million of which is included within Income/(Loss) from Discontinued Operations, Net of Tax in the Consolidated Statements of Operations.
	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 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 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, 2013. UDR and its subsidiaries are subject to federal income tax as well as income tax of various state and local jurisdictions. The tax years 2010 through 2012 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 General and Administrative
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, 2013, 2012, and 2011, 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 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, 2013, 2012, and 2011 was $250,000, $80,000, and $(404,000), 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, 2013, 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 December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-10, Disclosures about Offsetting Assets and Liabilities. The objective of this update is to provide enhanced disclosures that will enable users of its financial statements to evaluate the effect or potential effect of netting arrangements on an entity’s financial position. This included the effect or potential effect of rights of setoff associated with an entity’s recognized assets and recognized liabilities within the scope of this update. The amendments require enhanced disclosures by requiring improved information about financial instruments and derivative instruments that are either 1) offset on the balance sheet in accordance with the “Offsetting Guidance” in ASC 210-20-45 or ASC 815-10-45 (collectively, the offsetting guidance) or 2) subject to an enforceable master netting arrangement or similar agreement, regardless of whether they are offset in accordance with the “Offsetting Guidance”. The amendments, which were adopted by the Operating Partnership on January 1, 2013, impacted the Operating Partnership’s disclosures related to its derivative activities. (See Note 8, Derivatives and Hedging Activity.) The new guidance did not have any impact on the Operating Partnership’s consolidated financial position, results of operations, or cash flows.
	In February 2012, the FASB issued ASU No. 2013-02, Other Comprehensive Income (Topic 220) to require preparers to report, in one place, information about reclassifications out of accumulated other comprehensive income (“AOCI”). For significant items reclassified out of AOCI to net income in their entirety in the same reporting period, reporting (either on the face of the statement where net income is presented or in the notes thereto) is required about the effect of the reclassifications on the respective line items in the statement where net income is presented. For items that are not reclassified to net income in their entirety in the same reporting period, a cross reference to other existing disclosures is required in the notes. The amendments, which were adopted by the Operating Partnership on January 1, 2013, did not have any impact on the Operating Partnership's consolidated financial position, results of operations, or cash flows. The accompanying consolidated financial statements include the required disclosures in the Consolidated Statements of Comprehensive Income/(Loss) or in the notes thereto for each of the three years in the period ended December 31, 2013.
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. As of December 31, 2013 and 2012, the amount of our net intangible assets which are reflected in Other Assets was $7.6 million and $9.3 million, respectively. As of December 31, 2013 and 2012, the amount of our net intangible liabilities which are reflected in Accounts Payable, Accrued Expenses, and Other Liabilities was $3.5 million and $3.9 million in our Consolidated Balance Sheets. The balances are being amortized over the remaining life of the respective intangible.
	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, 2013, 2012, and 2011 were $2.5 million, $2.1 million, and $2.2 million, respectively. During the years ended December 31, 2013, 2012, and 2011, total interest capitalized was $5.9 million, $3.7 million, $1.8 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 Operating Partnership’s cash and cash equivalents are held at major commercial banks.
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 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 Tax
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
	Under GAAP, the results of operations for those properties sold during the year or classified as held for sale at the end of the current year are 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 4, 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, 2013, 2012, and 2011, 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 9, 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 6, 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 (2010 through 2012) 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, 2013, 2012, and 2011, total advertising expense from continuing and discontinued operations was $2.5 million, $2.4 million, and $2.5 million, respectively.
Comprehensive income	'
	Comprehensive Income/(Loss)
	Comprehensive income, 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, 2013, 2012, and 2011, 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 8, 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, 2013, the Operating Partnership held greater than 10% of the carrying value of its real estate portfolio in the Orange County, California; San Francisco, California; Metropolitan D.C.; and New York, New York markets.

IncomeLoss_Per_Share_UNITED_DO1

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) Income/(Loss) Per Share (UNITED DOMNION REALTY, L.P.) (Policies)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share, Policy [Policy Text Block]	'
United Dominion Reality L P [Member]	'
Earnings Per Share [Abstract]	'
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, 2013, 2012, and 2011, 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 9, Capital Structure, for further discussion on redemption rights of OP Units.

Significant_Accounting_Policie4

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Notes receivable	'
	Notes Receivable
	The following table summarizes our notes receivable, net as of December 31, 2013 and 2012 (dollars in thousands):
		Interest rate at December 31, 2013			December 31, 2013				December 31, 2012
	Note due March 2014 (a)	3.67	%		$	40,800			$	—
	Note due October 2014 - related party (b)	—			—				24,481
	Note due February 2017 (c)	10	%		14,580				13,200
	Note due July 2017 (d)	8	%		1,400				100
	Note due June 2022 (net of discount of $247 and $275) (e)	7	%		26,253				26,225
	Total notes receivable, net				$	83,033			$	64,006
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):
			Years Ended December 31,
			2013				2012				2011
	Numerator for income/(loss) per share:
	Income/(loss) from continuing operations		$	2,340			$	(46,305	)		$	(126,869	)
	(Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership		48				2,089				4,937
	(Income)/loss from continuing operations attributable to noncontrolling interests		60				(140		)		(167		)
	Income/(loss) from continuing operations attributable to UDR, Inc.		2,448				(44,356		)		(122,099		)
	Distributions to preferred stockholders - Series E (Convertible)		(3,724		)		(3,724		)		(3,724		)
	Distributions to preferred stockholders - Series G		—				(2,286		)		(5,587		)
	Premium on preferred stock redemption or repurchases, net		—				(2,791		)		(175		)
	Income/(loss) from continuing operations attributable to common stockholders		$	(1,276	)		$	(53,157	)		$	(131,585	)
	Income/(loss) from discontinued operations, net of tax		$	43,942			$	266,608			$	147,454
	(Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership		(1,578		)		(10,075		)		(5,332		)
	Income/(loss) from discontinued operations attributable to common stockholders		$	42,364			$	256,533			$	142,122
	Net income/(loss) attributable to common stockholders		$	41,088			$	203,376			$	10,537
	Denominator for income/(loss) per share - basic and diluted:
	Weighted average common shares outstanding		250,684				239,482				202,573
	Non-vested restricted stock awards		(715		)		(631		)		(1,279		)
	Denominator for income/(loss) per share - basic and diluted		249,969				238,851				201,294
	Income/(loss) per weighted average common share - basic and diluted:
	Income/(loss) from continuing operations attributable to common stockholders		$	(0.01	)		$	(0.22	)		$	(0.65	)
	Income/(loss) from discontinued operations attributable to common stockholders		$	0.17			$	1.07			$	0.71
	Net income/(loss) attributable to common stockholders		$	0.16			$	0.85			$	0.05
Schedule of equity instruments convertible to common stock [Table Text Block]	'

Real_Estate_Owned_Tables

Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2013
Real Estate [Abstract]	'
Summary of carrying amounts for real estate owned (at cost)	'
	homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2013 and 2012 (dollars in thous

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Rental income	$	9,152		$	39,543		$	117,269
	Rental expenses	3,511			14,106			44,100
	Property management	252			1,087			3,226
	Real estate depreciation	1,958			8,475			45,713
	Interest and other (income)/expense, net	(62		)	821			2,066
	Income/(loss) attributable to disposed properties and assets held for sale	3,493			15,054			22,164
	Net gain/(loss) on the sale of depreciable property	41,919			260,404			138,508
	Impairment charges	(2,355		)	—			—
	Income tax benefit/(expense)	885			(8,850		)	(13,218		)
	Income/(loss) from discontinued operations, net of tax	$	43,942		$	266,608		$	147,454
	Income/(loss) from discontinued operations attributable to UDR, Inc.	$	42,364		$	256,533		$	142,122

Joint_Ventures_Tables

Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 (dollars in thousands):
	Joint Venture	Location of Properties		Number of Properties		Number of Apartment Homes		Investment at						UDR’s Ownership Interest
				2013		2013		2013			2012			2013				2012
	Operating and development:
	UDR/MetLife I (a)	Various		8 operating communities		1,641		$	47,497		$	74,964		13.2			%	13.3			%
				7 land parcels		N/A								4			%	4.3			%
	UDR/MetLife II (a)	Various		15 operating communities		3,119		327,926			326,600			50			%	50			%
	UDR/MetLife Vitruvian Park® (b)	Addison, TX		2 operating communities		739		79,318			—			50			%	—
				1 non-stabilized community		391
				6 land parcels		N/A
	UDR/MetLife 399 Fremont (c)	San Francisco, CA		1 development community (*)		447		36,313			—			51			%	—
	UDR/KFH (d)	Washington, D.C.		3 operating communities		660		25,919			29,589			30			%	30			%
	Texas (e)	Texas		8 operating communities		3,359		(23,591		)	(25,309		)	20			%	20			%
	Lodge at Stoughton (f)	Stoughton, MA		—		—		—			16,311			—				95			%
	13th & Market (g)	San Diego, CA		—		—		—			29,930			—				95			%
	Domain College Park (g)	College Park, MD		—		—		—			25,546			—				95			%
	Investment in and advances to unconsolidated joint ventures, net, before participating loan investment							493,382			477,631
		Location		Preferred Return		Years To Maturity		Investment at						Income From Participating Loan Investment For The Years Ended
	Participating loan investment:							2013			2012			2013		2012			2011
	Steele Creek (h)	Denver, CO		6.50%		3.8		14,273			—			$156		$—			$—
	Total investment in and advances to unconsolidated joint ventures, net							$	507,655		$	477,631
	(*)    The number of apartment homes for the communities under development presented in the table above is based on the projected number of total homes. The number of apartment homes completed as of December 31, 2013 for one development community at UDR/MetLife 399 Fremont was zero.
	(a) In June 2013 and within UDR/MetLife I, the Company exchanged with MetLife its approximately 10% ownership interest in four operating communities and paid MetLife an additional $15.6 million in cash for an increased ownership interest of approximately 35% in two high-rise operating communities, bringing UDR's ownership interest in the two high-rise operating communities to 50% each. The two high-rise operating communities are located in Denver, Colorado and San Diego, California and were subsequently contributed to UDR/MetLife II. The four operating communities in which UDR exchanged its ownership interest are located in Washington D.C.; San Francisco, California; Dallas, Texas; and Charlotte, North Carolina. At 50% ownership, the Company's pro-rata share of the undepreciated book value of the UDR/MetLife II joint venture assets and outstanding debt was $796.4 million and $444.6 million, respectively, at June 30, 2013. UDR continues to fee manage the four operating communities in which UDR exchanged its ownership interests.
	In November 2012, the Company exchanged its 12% ownership interest in four operating communities and 3.1% ownership in two land parcels in UDR/MetLife I, and paid MetLife $10.0 million in cash for an additional 41% ownership interest in The Olivian, a high-rise building located in downtown Seattle, bringing UDR’s ownership interest in The Olivian to 50%. The community was contributed to UDR/MetLife II. The properties and land parcels, in which UDR exchanged its ownership interest, are located in Houston, Texas; Tampa, Florida; Charlotte, North Carolina; and Chicago, Illinois. UDR continued to fee manage the four operating communities.
	In January 2012, the Company formed a new real estate joint venture, UDR/MetLife II, with MetLife, in which each party owned a 50% interest. The 12 communities in the joint venture included seven from UDR/MetLife I, while the remaining five operating communities were newly acquired by UDR/MetLife II. The newly acquired communities, collectively known as Columbus Square, were recently developed, high-rise apartment buildings located on the Upper West Side of Manhattan and were purchased for $637.5 million. The Company serves as the general partner with significant participating rights held by our partner. The Company earns property management, asset management and financing fees. Our initial investment was $327.1 million, which consisted of $293.5 million of cash paid and $33.6 million of our equity in the seven communities transferred from UDR/MetLife I.
	(b) In June 2013, the Company sold a 50% interest in five partnerships (the “UDR/MetLife Vitruvian Park® Partnerships”) to MetLife for approximately $141.3 million. The transaction resulted in a gain of approximately $436,000 which the Company has deferred until the terms of the construction completion guarantee have been met. Under the terms of the UDR/MetLife Vitruvian Park® Partnerships, the Company serves as the general partner with significant participating rights held by our partner, and earns fees for property management, asset management, and financing transactions. The UDR/MetLife Vitruvian Park® Partnerships are accounted for under the equity method of accounting. Our initial investment was approximately $80.2 million, which consisted of approximately $140.0 million (50% of our net book value of the real estate at the time of the transaction) reduced by our share of the net proceeds received upon encumbering the assets of approximately $58.7 million and other operating adjustments.
	At closing, a total of $118.3 million of secured debt was placed on the two operating communities and the community under development. The debt on the two operating communities carries an interest rate of 4.0% with a term of ten years and the non-recourse construction loan on the community under development carries an interest rate of LIBOR plus 175 basis points with a term of two years and two one-year extension options. The Company has guaranteed the completion of the construction of the development. Proceeds from the construction loan will be used for completion of construction of the development. Upon completion, at its 50% ownership, the Company's pro-rata share of the undepreciated book value of the UDR/MetLife Vitruvian Park® Partnerships' real estate assets and outstanding debt will be approximately $145.0 million and $62.8 million, respectively.
	(c) In January 2012, the Company formed a joint venture with an unaffiliated third party to acquire 399 Fremont (land for future development) in San Francisco, California. At closing, UDR owned a noncontrolling interest of 92.5% in the joint venture. The Company’s total investment was $55.5 million, which consists of its initial investment of $37.3 million and an option to exercise its right to acquire its partner’s 7.5% ownership interest in the joint venture. In October 2012, the Company exercised its option and paid $13.5 million. In January 2013, the Company subsequently acquired its partner’s 7.5% ownership interest for $4.7 million. In December 2013, the Company sold a 49% interest to MetLife in the fully-entitled 399 Fremont land parcel for approximately $29.9 million. In conjunction with the sale, the Company formed a new unconsolidated real estate joint venture with MetLife, UDR/MetLife 399 Fremont, to develop a $318 million, 447-home, luxury high-rise tower on the site. Construction commenced in the first quarter 2014. As the Company recently acquired the 399 Fremont land parcel, the sale price was equivalent to the cost basis resulting in no gain or loss on the transaction. Under the terms of the partnership, the Company serves as the general partner with significant participating rights held by our partner, and has the ability to earn fees for development management, property management, asset management, and financing transactions. The UDR/MetLife 399 Fremont Partnership is accounted for under the equity method of accounting. Our initial investment was approximately $31.1 million.
	(d) UDR is a partner with an unaffiliated third party, which formed a joint venture for the investment of up to $450 million in multifamily properties located in key, high barrier to entry markets. The partners will contribute equity of $180 million of which the Company’s maximum equity will be 30% or $54 million when fully invested.
	(e) During the year ended December 31, 2012, the Company acquired the remaining 80% ownership interests in two apartment communities (633 homes) in Austin, Texas for $11.7 million from the joint venture. The Company’s investment in the joint venture at December 31, 2013 and 2012 was net of deferred profits on the sale of depreciable properties to the joint venture of $24.0 million and $28.5 million, respectively.
	(f) In December 2013, the Company sold its 95% interest in the Lodge at Stoughton, a recently developed unconsolidated joint venture community located in the greater Boston area, for approximately $48.5 million based on our 95% ownership, which resulted in a gain (before tax) of approximately $8.3 million. In conjunction with the sale, the Company provided the buyer with a $40.8 million three-month bridge loan at LIBOR plus a spread of 350 basis points with two three-month extension options at increased rates.
	(g) In December 2013, the Company consolidated its 95%/5% development joint ventures 13th and Market in San Diego, CA and Domain College Park in Metropolitan, D.C. The consolidation was due to the Company becoming the managing partner of each of the joint ventures. For additional information, see the “Consolidated Joint Ventures” section above.
	(h) In October 2013, the Company entered into a participating debt financing arrangement with a third party that is developing a $108 million, 218-home, high-rise luxury community located adjacent to the Cherry Creek Mall in Denver, Colorado. Per the terms of the agreement, UDR will finance up to 85%, or approximately $92.0 million, of the development cost at an interest rate of 6.5% per annum on the outstanding debt balance. In addition, the Company has the option to purchase the community upon completion of construction and has a 50% participating interest in the profit upon the acquisition of the community or sale to a third party. The Company will account for the arrangement consistent with an investment in real estate under the equity method of accounting. As of December 31, 2013, our loan receivable balance was $14.3 million which was included in Investment In and Advances To Unconsolidated Joint Ventures on the Consolidated Balance Sheets. Also we recognized $156,000 of interest income included in Income/(Loss) from Unconsolidated Entities on the Consolidated Statements of Operations.
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, 2013, 2012, and 2011 (dollars in thousands):
	As of and For the Year Ended December 31, 2013	UDR/MetLife I			UDR/MetLife II			UDR/MetLife Vitruvian Park®			Texas			UDR/KFH				Other joint ventures				Total
	Condensed Statements of Operations:
	Total revenues	$	52,532		$	109,926		$	7,680		$	39,273		$	19,221			$	5,324			$	233,956
	Property operating expenses	24,191			33,809			4,633			18,279			7,035				3,292				91,239
	Real estate depreciation and amortization	14,150			30,122			3,830			17,911			14,199				3,564				83,776
	Operating income/(loss)	14,191			45,995			(783		)	3,083			(2,013		)		(1,532		)		58,941
	Interest expense	(15,162		)	(37,055		)	(1,886		)	(12,667		)	(5,872		)		(913		)		(73,555		)
	Other income/(expense)	3			1			—			—			—				—				4
	Income/(loss) from discontinued operations	(21,465		)	—			—			—			—				—				(21,465		)
	Net income/(loss)	$	(22,433	)	$	8,941		$	(2,669	)	$	(9,584	)	$	(7,885	)		$	(2,445	)		$	(36,075	)
	UDR recorded income (loss) from unconsolidated entities	$	(4,675	)	$	4,471		$	(2,851	)	$	(1,218	)	$	(2,366	)		$	6,224			$	(415	)
	Condensed Balance Sheets:
	Total real estate, net	$	830,813		$	1,476,588		$	283,878		$	218,669		$	249,097			$	65,133			$	3,124,178
	Cash and cash equivalents	7,817			16,454			3,498			11,734			2,289				—				41,792
	Other assets	10,855			16,666			1,578			1,578			1,474				83				32,234
	Total assets	849,485			1,509,708			288,954			231,981			252,860				65,216				3,198,204
	Amount due to UDR	5,941			2,275			1,352			1,063			420				1,136				12,187
	Third party debt	339,365			877,799			120,999			219,588			165,209				—				1,722,960
	Accounts payable and accrued liabilities	6,113			14,508			7,152			9,742			1,234				2,813				41,562
	Total liabilities	351,419			894,582			129,503			230,393			166,863				3,949				1,776,709
	Total equity	$	498,066		$	615,126		$	159,451		$	1,588		$	85,997			$	61,267			$	1,421,495
	UDR’s investment in unconsolidated joint ventures	$	47,497		$	327,926		$	79,318		$	(23,591	)	$	25,919			$	50,586			$	507,655
	As of and For the Year Ended December 31, 2012	UDR/MetLife I			UDR/MetLife II			UDR/MetLife Vitruvian Park® (a)			Texas			UDR/KFH				Other joint ventures (a)				Total
	Condensed Statements of Operations:
	Total revenues	$	56,099		$	87,386		$	—		$	37,090		$	18,670			$	2,724			$	201,969
	Property operating expenses	25,084			25,737			—			17,053			6,831				1,368				76,073
	Real estate depreciation and amortization	16,310			32,553			—			18,448			16,546				1,897				85,754
	Operating income/(loss)	14,705			29,096			—			1,589			(4,707		)		(541		)		40,142
	Interest expense	(16,725		)	(29,170		)	—			(12,704		)	(5,890		)		(561		)		(65,050		)
	Other income/(expense)	(5		)	(9		)	—			—			—				—				(14		)
	Income/(loss) from discontinued operations	10,890			—			—			10,075			—				—				20,965
	Net income/(loss)	$	8,865		$	(83	)	$	—		$	(1,040	)	$	(10,597	)		$	(1,102	)		$	(3,957	)
	UDR recorded income/(loss) from unconsolidated entities	$	(1,750	)	$	15		$	—		$	(2,399	)	$	(3,221	)		$	(1,224	)		$	(8,579	)
	Condensed Balance Sheets:
	Real estate held for sale, net	$	243,755		$	—		$	—		$	—		$	—			$	—			$	243,755
	Total real estate, net	945,784			1,346,698			—			232,733			260,911				105,800				2,891,926
	Cash and cash equivalents	13,496			13,002			—			11,002			2,697				1,212				41,409
	Other assets	9,497			14,216			—			3,487			1,794				1,884				30,878
	Total assets	1,212,532			1,373,916			—			247,222			265,402				108,896				3,207,968
	Amount due to UDR	1,456			3,979			—			1,150			443				201				7,229
	Third party debt	385,391			775,444			—			219,588			165,209				—				1,545,632
	Third party debt related to real estate held for sale	89,640			—			—			—			—				30,637				120,277
	Accounts payable and accrued liabilities	12,327			15,615			—			11,056			1,492				6,700				47,190
	Total liabilities	488,814			795,038			—			231,794			167,144				37,538				1,720,328
	Total equity, inclusive of noncontrolling interest	$	723,718		$	578,878		$	—		$	15,428		$	98,258			$	71,358			$	1,487,640
	UDR’s investment in unconsolidated joint ventures	$	74,964		$	326,600		$	—		$	(25,309	)	$	29,589			$	71,787			$	477,631
	For the Year Ended December 31, 2011	UDR/MetLife I			UDR/MetLife II (a)			UDR/MetLife Vitruvian Park® (a)			Texas			UDR/KFH				Other joint ventures				Total
	Condensed Statements of Operations:
	Total revenues	$	48,628		$	—		$	—		$	35,130		$	5,741			$	—			$	89,499
	Property operating expenses	25,297			—			—			16,202			7,775				—				49,274
	Real estate depreciation and amortization	15,699			—			—			18,040			4,310				—				38,049
	Operating income/(loss)	7,632			—			—			888			(6,344		)		—				2,176
	Interest expense	(15,416		)	—			—			(12,651		)	(1,918		)		—				(29,985		)
	Other income/(expense)	(154		)	—			—			—			—				—				(154		)
	Income/(loss) from discontinued operations	7,246			—			—			(1,868		)	—				(436		)		4,942
	Net income/(loss)	$	(692	)	$	—		$	—		$	(13,631	)	$	(8,262	)		$	(436	)		$	(23,021	)
	UDR recorded income/(loss) from unconsolidated entities	$	(904	)	$	—		$	—		$	(2,726	)	$	(2,437	)		$	(285	)		$	(6,352	)

Secured_Debt_and_Unsecured_Deb1

Secured Debt and Unsecured Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Secured debt instruments	'
	The following is a summary of our secured and unsecured debt at December 31, 2013 and 2012 (dollars in thousands):
		Principal Outstanding						For the Year Ended December 31, 2013
								Weighted Average			Weighted Average		Number of Communities
		December 31,						Interest Rate			Years to Maturity		Encumbered
		2013			2012
	Secured Debt:
	Fixed Rate Debt
	Mortgage notes payable (a)	$	445,706		$	455,533		5.44	%		2.5		8
	Fannie Mae credit facilities (b)	626,667			631,078			4.99	%		5		22
	Total fixed rate secured debt	1,072,373			1,086,611			5.18	%		4		30
	Variable Rate Debt
	Mortgage notes payable	63,595			37,415			2.34	%		2.1		2
	Tax-exempt secured notes payable (c)	94,700			94,700			0.84	%		9.2		2
	Fannie Mae credit facilities (b)	211,409			211,409			1.61	%		6.5		7
	Total variable rate secured debt	369,704			343,524			1.54	%		6.5		11
	Total Secured Debt	1,442,077			1,430,135			4.24	%		4.6		41
	Unsecured Debt:
	Commercial Banks
	Borrowings outstanding under an unsecured credit facility due December 2017 (d), (i)	—			76,000			—			3.9
	Senior Unsecured Notes
	3.70% Medium-Term Notes due October 2020 (net of discount of $54) (g), (i)	299,946			—			3.7	%		6.8
	4.63% Medium-Term Notes due January 2022 (net of discount of $2,882 and $3,241) (i)	397,118			396,759			4.63	%		8
	1.42% Term Notes due June 2018 (e), (i)	35,000			35,000			1.42	%		4.4
	2.50% Term Notes due June 2018 (e), (i)	65,000			65,000			2.5	%		4.4
	6.05% Medium-Term Notes due June 2013	—			122,500			—			—
	5.13% Medium-Term Notes due January 2014 (h)	184,000			184,000			5.13	%		0
	5.50% Medium-Term Notes due April 2014 (net of discount of $20 and $89)	128,480			128,411			5.5	%		0.3
	5.25% Medium-Term Notes due January 2015 (net of discount of $134 and $262)	325,041			324,913			5.25	%		1
	5.25% Medium-Term Notes due January 2016	83,260			83,260			5.25	%		2
	2.73% Term Notes due June 2018 (f) (i)	250,000			250,000			2.73	%		4.4
	8.50% Debentures due September 2024	15,644			15,644			8.5	%		10.7
	4.25% Medium-Term Notes due June 2018 (net of discount of $1,893 and $2,322) (i)	298,107			297,678			4.25	%		4.4
	Other	30			33			N/A			N/A
	Total Unsecured Debt	2,081,626			1,979,198			4.35	%		4.2
	Total Debt	$	3,523,703		$	3,409,333		4.31	%		4.4
Secured credit facilities	'
	Further information related to these credit facilities is as follows (dollars in thousands):
		December 31, 2013			31-Dec-12
	Borrowings outstanding	$	838,076		$	842,487
	Weighted average borrowings during the period ended	839,597			903,817
	Maximum daily borrowings during the period ended	841,494			1,054,735
	Weighted average interest rate during the period ended	4.2		%	4.3		%
	Weighted average interest rate at the end of the period	4.1		%	4.4		%
Aggregate maturities of secured debt	'
	The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next five years subsequent to December 31, 2013 are as follows (dollars in thousands):
	Year		Total Fixed Secured Debt			Total Variable Secured Debt			Total Secured Debt			Total Unsecured Debt (a)		Total Debt
	2014		$	48,035		$	—		$	48,035		$	311,574	$	359,609
	2015		197,210			—			197,210			324,382		521,592
	2016		136,431			63,595			200,026			82,478		282,504
	2017		178,398			65,000			243,398			—		243,398
	2018		176,483			50,000			226,483			648,646		875,129
	Thereafter		335,816			191,109			526,925			714,546		1,241,471
	Total		$	1,072,373		$	369,704		$	1,442,077		$	2,081,626	$	3,523,703
	(a) With the exception of the 1.42% Term Notes due June 2018 and revolving credit facility which carry a variable interest rate, all unsecured debt carries fixed interest rates.
Summary of short-term bank borrowings under bank credit facility	'
	The following is a summary of short-term bank borrowings under UDR’s bank credit facility at December 31, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Total revolving credit facility	$	900,000		$	900,000
	Borrowings outstanding at end of period (1)	—			76,000
	Weighted average daily borrowings during the period ended	169,844			167,038
	Maximum daily borrowings during the period ended	372,000			788,000
	Weighted average interest rate during the period ended	1.2		%	1.5		%
	Interest rate at end of the period	1.3		%	1.4		%
	(1) Excludes $2.2 million and $3.9 million of letters of credit at December 31, 2013 and 2012, respectively.

IncomeLoss_Per_Share_IncomeLos

Income/(Loss) Per Share Income/(Loss) Per Share (Details 1) (Tables)	12 Months Ended
	Dec. 31, 2013
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):
		Years Ended December 31,
		2013			2012			2011
	Numerator for income/(loss) per share:
	Income/(loss) from continuing operations	$	2,340		$	(46,305	)	$	(126,869	)
	(Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership	48			2,089			4,937
	(Income)/loss from continuing operations attributable to noncontrolling interests	60			(140		)	(167		)
	Income/(loss) from continuing operations attributable to UDR, Inc.	2,448			(44,356		)	(122,099		)
	Distributions to preferred stockholders - Series E (Convertible)	(3,724		)	(3,724		)	(3,724		)
	Distributions to preferred stockholders - Series G	—			(2,286		)	(5,587		)
	Premium on preferred stock redemption or repurchases, net	—			(2,791		)	(175		)
	Income/(loss) from continuing operations attributable to common stockholders	$	(1,276	)	$	(53,157	)	$	(131,585	)
	Income/(loss) from discontinued operations, net of tax	$	43,942		$	266,608		$	147,454
	(Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership	(1,578		)	(10,075		)	(5,332		)
	Income/(loss) from discontinued operations attributable to common stockholders	$	42,364		$	256,533		$	142,122
	Net income/(loss) attributable to common stockholders	$	41,088		$	203,376		$	10,537
	Denominator for income/(loss) per share - basic and diluted:
	Weighted average common shares outstanding	250,684			239,482			202,573
	Non-vested restricted stock awards	(715		)	(631		)	(1,279		)
	Denominator for income/(loss) per share - basic and diluted	249,969			238,851			201,294
	Income/(loss) per weighted average common share - basic and diluted:
	Income/(loss) from continuing operations attributable to common stockholders	$	(0.01	)	$	(0.22	)	$	(0.65	)
	Income/(loss) from discontinued operations attributable to common stockholders	$	0.17		$	1.07		$	0.71
	Net income/(loss) attributable to common stockholders	$	0.16		$	0.85		$	0.05

IncomeLoss_Per_Share_IncomeLos1

Income/(Loss) Per Share Income/(Loss) Per Share (Details 2) (Tables)	12 Months Ended
	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'
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, 2013, 2012, and 2011 (shares in thousands):
		Years Ended December 31,
		2013	2012	2011
	OP Units	9,337	9,411	7,602
	Preferred Stock	3,036	3,036	3,036
	Stock options and unvested restricted stock	1,584	1,361	2,154

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013 is as follows:
		Option Outstanding			Option Exercisable			Restricted Stock
		Number of	Weighted		Number of	Weighted		Number		Weighted
		Options	Average		Options	Average		of shares		Average Fair
			Exercise			Exercise				Value Per
			Price			Price				Restricted Stock
	Balance, December 31, 2012	2,430,127	$	12.63	2,430,127	$	12.63	328,223		$	23.35
	Granted	—	—					604,477		23.71
	Exercised	—	—					—		—
	Vested	—	—					(146,794	)	21.95
	Forfeited	—	—					(27,161	)	23.91
	Balance, December 31, 2013	2,430,127	$	12.63	2,430,127	$	12.63	758,745		$	23.89

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011:
		Years Ended December 31,
		2013			2012			2011
	Ordinary income	$	0.744		$	0.174		$	0.491
	Long-term capital gain	0.114			0.186			0.074
	Unrecaptured section 1250 gain	0.067			0.515			0.205
		$	0.925		$	0.875		$	0.77
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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Income tax (benefit)/expense
	Current
	Federal	$	(1,030	)	$	1,961		$	463
	State	846			1,463			552
	Total current	(184		)	3,424			1,015
	Deferred
	Federal	(6,907		)	(21,479		)	6,646
	State	(1,190		)	(3,021		)	(90		)
	Total deferred	(8,097		)	(24,500		)	6,556
	Total income tax (benefit)/expense	$	(8,281	)	$	(21,076	)	$	7,571
	Classification of income tax (benefit)/expense
	Continuing operations	$	(7,299	)	$	(30,717	)	$	(5,647	)
	Discontinued operations	(982		)	9,641			13,218
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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Deferred tax assets:
	Federal and state tax attributes	$	13,069		$	1,464		$	24,524
	Book/tax depreciation	19,354			12,345			10,045
	Construction capitalization differences	—			6,635			5,948
	Investment in partnerships	—			3,112			3,618
	Debt and interest deductions	10,311			—			—
	Other	—			2,009			999
	Total deferred tax assets	42,734			25,565			45,134
	Valuation allowance	(1,310		)	(1,390		)	(45,134		)
	Net deferred tax assets	41,424			24,175			—
	Deferred tax liabilities:
	Construction capitalization differences	(3,766		)	—			—
	Investment in partnerships	(5,080		)	—			—
	Other	(305		)	—			—
	Total deferred tax liabilities	(9,151		)	—			—
	Net deferred tax asset	$	32,273		$	24,175		$	—
Schedule of effective income tax rate reconciliation	'
	Income tax benefit/(expense) differed from the amounts computed by applying the U.S. statutory rate of 35% to pretax income/(loss) for the years ended December 31, 2013, 2012, and 2011 as follows (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Income tax (benefit)/expense
	U.S. federal income tax (benefit)/expense	$	(8,493	)	$	21,853		$	11,715
	State income tax provision	46			2,497			2,099
	Other items	246			(1,682		)	1,227
	Valuation allowance	(80		)	(43,744		)	(7,470		)
	Total income tax (benefit)/expense	$	(8,281	)	$	(21,076	)	$	7,571

Noncontrolling_Interests_Table

Noncontrolling Interests (Tables)	12 Months Ended
	Dec. 31, 2013
Noncontrolling Interest [Abstract]	'
Redeemable noncontrolling interests in the Operating Partnership	'
	The following table sets forth redeemable noncontrolling interests in the Operating Partnership for the years ended December 31, 2013 and 2012 (dollars in thousands):
		Years Ended December 31,
		2013			2012
	Redeemable noncontrolling interests in the Operating Partnership, December 31, 2012	$	223,418		$	236,475
	Mark to market adjustment to redeemable noncontrolling interests in the Operating Partnership	3,656			(11,392		)
	Conversion of OP Units to Common Stock	(1,817		)	(529		)
	Net income/(loss) attributable to redeemable noncontrolling interests in the Operating Partnership	1,530			7,986
	Distributions to redeemable noncontrolling interests in the Operating Partnership	(9,440		)	(9,202		)
	Allocation of other comprehensive income/(loss)	250			80
	Redeemable noncontrolling interests in the Operating Partnership, December 31, 2013	$	217,597		$	223,418
	The following sets forth net income/(loss) attributable to common stockholders and transfers from redeemable noncontrolling interests in the Operating Partnership for the following periods (dollars in thousands):
			Years Ended December 31,
			2013			2012		2011
	Net income/(loss) attributable to common stockholders		$	41,088		$	203,376	$	10,537
	Conversion of OP units to UDR Common Stock		1,817			529		287
	Change in equity from net income/(loss) attributable to common stockholders and conversion of OP units to UDR Common Stock		$	42,905		$	203,905	$	10,824

Fair_Value_of_Derivatives_and_2

Fair Value of Derivatives and Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 are summarized as follows (dollars in thousands):
						Fair Value at December 31, 2013, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2013		Fair Value Estimate at December 31, 2013		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs
						Assets or		Inputs		(Level 3)
						Liabilities		(Level 2)
						(Level 1)
	Description:
	Notes receivable (a)	$	83,033	$	83,833	$	—	$	—	$	83,833
	Total assets	$	83,033	$	83,833	$	—	$	—	$	83,833
	Derivatives - Interest rate contracts (b)	$	4,965	$	4,965	$	—	$	4,965	$	—
	Secured debt instruments - fixed rate: (c)
	Mortgage notes payable	445,706		466,375		—		—		466,375
	Fannie Mae credit facilities	626,667		661,094		—		—		661,094
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	63,595		63,595		—		—		63,595
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments (c):
	Senior unsecured notes	2,081,626		2,149,003		—		—		2,149,003
	Total liabilities	$	3,528,668	$	3,651,141	$	—	$	4,965	$	3,646,176
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	217,597	$	217,597	$	—	$	217,597	$	—
						Fair Value at December 31, 2012, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2012		Fair Value Estimate at December 31, 2012		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs (Level 3)
						Assets or		Inputs (Level 2)
						Liabilities (Level 1)
	Description:
	Notes receivable (a)	$	64,006	$	64,930	$	—	$	—	64,930
	Derivatives- Interest rate contracts (b)	2		2		—		2		—
	Total assets	$	64,008	$	64,932	$	—	$	2	$	64,930
	Derivatives- Interest rate contracts (b)	$	11,022	$	11,022	$	—	$	11,022	$	—
	Secured debt instruments- fixed rate: (c)
	Mortgage notes payable	455,533		494,728		—		—		494,728
	Fannie Mae credit facilities	631,078		689,295		—		—		689,295
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	37,415		37,415		—		—		37,415
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments: (c)
	Commercial bank	76,000		76,000		—		—		76,000
	Senior unsecured notes	1,903,198		2,039,736		—		—		2,039,736
	Total liabilities	$	3,420,355	$	3,654,305	$	—	$	11,022	$	3,643,283
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	223,418	$	223,418	$	—	$	223,418	$	—
	(a)	See Note 2, Significant Accounting Policies.
	(b)	See Note 13, Derivatives and Hedging Activity.
	(c)

Derivatives_and_Hedging_Activi2

Derivatives and Hedging Activity (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013 and December 31, 2012:
	Offsetting of Derivative Assets
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Assets				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)				Financial Instruments				Cash Collateral Received				Net Amount
	December 31, 2013		$	—			$	—			$	—			$	—			$	—			$	—
	December 31, 2012		$	2			$	—			$	2			$	—			$	—			$	2
Offsetting Liabilities [Table Text Block]	'
	Offsetting of Derivative Liabilities
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)				Financial Instruments				Cash Collateral Posted				Net Amount
	December 31, 2013		$	4,965			$	—			$	4,965			$	—			$	—			$	4,965
	December 31, 2012		$	11,022			$	—			$	11,022			$	—			$	—			$	11,022
Outstanding interest rate derivatives	'
	As of December 31, 2013, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):
	Interest Rate Derivative		Number of Instruments		Notional
	Interest rate swaps		11		$	419,787
	Interest rate caps		5		$	274,291
	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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a gain/(loss) of $271,000, $290,000, and $(23,000) for the years ended December 31, 2013, 2012, and 2011, respectively.
	As of December 31, 2013, 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		2		$	155,197
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, 2013 and 2012 (dollars in thousands):
		Asset Derivatives										Liability Derivatives
				Fair Value at:										Fair Value at:
		Balance		December 31,				December 31,				Balance		December 31,				December 31,
		Sheet Location		2013				2012				Sheet Location		2013				2012
	Derivatives designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	2			Other liabilities		$	4,965			$	11,022
	Total			$	—			$	2					$	4,965			$	11,022
	Derivatives not designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	—			Other liabilities		$	—			$	—
	Total			$	—			$	—					$	—			$	—
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, 2013, 2012, and 2011 (dollars in thousands):
			Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)												Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)											Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Derivatives in Cash Flow Hedging Relationships		2013				2012				2011						2013				2012				2011				2013		2012		2011
	Interest rate products		$	(469	)		$	(4,924	)		$	(16,477	)		Interest expense		$	(6,851	)		$	(7,649	)		$	(9,132	)	Interest expense	$	—	$	—	$	(58	)
	Total		$	(469	)		$	(4,924	)		$	(16,477	)				$	(6,851	)		$	(7,649	)		$	(9,132	)		$	—	$	—	$	(58	)
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations	'
	Derivatives Not Designated as Hedging Instruments		Location of Gain or (Loss) Recognized in Income on Derivative		Amount of Gain or (Loss) Recognized in Income on Derivative
					2013				2012				2011
	Interest rate products		Interest and other income/(expense), net		$	271			$	290			$	(23	)
	Total				$	271			$	290			$	(23	)

Commitments_and_Contingencies_1

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Summary of real estate commitments	'
	The following summarizes the Company’s real estate commitments at December 31, 2013 (dollars in thousands):
		Number of		Costs Incurred			Expected Costs			Average Ownership
		Properties		to Date			to Complete (unaudited)			Stake
	Wholly-owned — under development	6		$	467,413	(a)	$	230,137		100	%
	Wholly-owned — redevelopment	2		134,261		(a)	39,039			100	%
	Joint ventures:
	Unconsolidated joint ventures	2		160,738			130,182		(b)	51	%
	Participating loan investments	1		14,273			77,736		(c)	0	%
				$	776,685		$	477,094
Schedule of future minimum lease payments	'
	Future minimum lease payments as of December 31, 2013 are as follows (dollars in thousands):
			Ground			Office Space
			Leases (a)
	2014		$	5,270		$	691
	2015		5,270			633
	2016		5,270			47
	2017		5,270			—
	2018		5,270			—
	Thereafter		314,501			—
			$	340,851		$	1,371
	(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, 2013
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, 2013, 2012, and 2011, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Reportable apartment home segment rental income
	Same-Store Communities
	West Region	$	232,374		$	219,988		$	204,570
	Mid-Atlantic Region	166,518			161,991			152,833
	Northeast Region	58,073			54,460			37,553
	Southeast Region	116,192			110,461			105,004
	Southwest Region	40,576			38,099			35,266
	Non-Mature Communities/Other	141,903			159,245			195,732
	Total segment and consolidated rental income	$	755,636		$	744,244		$	730,958
	Reportable apartment home segment NOI
	Same-Store Communities
	West Region	$	165,657		$	154,496		$	141,797
	Mid-Atlantic Region	115,805			112,699			105,213
	Northeast Region	42,353			39,376			27,181
	Southeast Region	75,825			71,218			66,202
	Southwest Region	24,869			22,817			20,319
	Non-Mature Communities/Other	89,532			103,594			124,048
	Total segment and consolidated NOI	514,041			504,200			484,760
	Reconciling items:
	Joint venture management and other fees	12,442			11,911			9,668
	Property management	(20,780		)	(20,465		)	(20,101		)
	Other operating expenses	(7,136		)	(5,718		)	(6,118		)
	Real estate depreciation and amortization	(341,490		)	(350,401		)	(370,343		)
	General and administrative	(42,238		)	(43,792		)	(47,257		)
	Hurricane-related recoveries/(charges), net	12,253			(8,495		)	—
	Other depreciation and amortization	(6,741		)	(4,105		)	(3,931		)
	Income/(loss) from unconsolidated entities	(415		)	(8,579		)	(6,352		)
	Interest expense	(126,083		)	(138,792		)	(156,366		)
	Interest and other income/(expense), net	4,681			2,703			5,688
	Tax benefit, net	7,299			30,282			5,647
	Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership	(1,530		)	(7,986		)	(395		)
	Net (income)/loss attributable to noncontrolling interests	60			(140		)	(167		)
	Net gain/(loss) on sale of depreciable property, net of impairment and tax	40,449			251,554			125,290
	Net income/(loss) attributable to UDR, Inc.	$	44,812		$	212,177		$	20,023
Details of assets of UDR's reportable segments	'
	The following table details the assets of UDR’s reportable segments as of December 31, 2013 and 2012 (dollars in thousands):
		December 31,			December 31,
		2013			2012
	Reportable apartment home segment assets:
	Same-Store communities:
	West Region	$	2,323,850		$	2,325,934
	Mid-Atlantic Region	1,431,590			1,419,873
	Northeast Region	738,805			723,437
	Southeast Region	889,753			887,483
	Southwest Region	350,158			346,449
	Non-mature Communities/Other	2,473,821			2,352,652
	Total segment assets	8,207,977			8,055,828
	Accumulated depreciation	(2,208,794		)	(1,924,682		)
	Total segment assets — net book value	5,999,183			6,131,146
	Reconciling items:
	Cash and cash equivalents	30,249			12,115
	Restricted cash	22,796			23,561
	Deferred financing costs, net	26,924			24,990
	Notes receivable, net	83,033			64,006
	Investment in and advances to unconsolidated joint ventures, net	507,655			477,631
	Other assets	137,882			125,654
	Total consolidated assets	$	6,807,722		$	6,859,103

Unaudited_Summarized_Consolida2

Unaudited Summarized Consolidated Quarterly Financial Data Unaudited Summarized Consolidated Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of quarterly financial information	'
	Selected consolidated quarterly financial data for the years ended December 31, 2013 and 2012 is summarized in the table below (dollars in thousands, except per share amounts):
			Three Months Ended
			March 31,			June 30,			September 30,			December 31,
	2013
	Rental income (a)		$	181,961		$	186,285		$	187,917		$	190,321
	Income/(loss) from continuing operations		(1,162		)	4,525			2,351			(3,374		)
	Income/(loss) from discontinued operations, net of tax		853			829			884			41,376
	Net income/(loss) attributable to common stockholders		(1,199		)	4,261			2,257			35,769
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	(0.00	)	$	0.02		$	0.01		$	0.14
	2012
	Rental income (a)		$	169,950		$	175,153		$	179,448		$	180,150
	Income/(loss) from continuing operations		915			(23,961		)	(9,287		)	(13,972		)
	Income/(loss) from discontinued operations, net of tax		85,713			180,268			(389		)	1,016
	Net income/(loss) attributable to common stockholders		80,848			145,721			(9,962		)	(13,231		)
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	0.37		$	0.62		$	(0.04	)	$	(0.05	)
	(a)	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
	(b)	Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.

Real_Estate_Owned_UNITED_DOMIN1

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
Summary of carrying amounts for real estate owned (at cost)	'
	homes. The following table summarizes the carrying amounts for our real estate owned (at cost) as of December 31, 2013 and 2012 (dollars in thous
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
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, 2013 and 2012 (dollars in thousands):
		December 31, 2013			December 31, 2012
	Land	$	1,004,447		$	994,709
	Depreciable property — held and used:
	Buildings, improvements, and furniture, fixtures and equipment	3,103,970			3,030,883
	Real estate sold:
	Land	—			12,015
	Buildings, improvements, and furniture, fixtures and equipment	—			57,921
	Under development:
	Land	9,447			25,833
	Construction in progress	70,616			61,559
	Real estate owned	4,188,480			4,182,920
	Accumulated depreciation	(1,241,574		)	(1,097,133		)
	Real estate owned, net	$	2,946,906		$	3,085,787

Discontinued_Operations_UNITED1

Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Rental income	$	9,152		$	39,543		$	117,269
	Rental expenses	3,511			14,106			44,100
	Property management	252			1,087			3,226
	Real estate depreciation	1,958			8,475			45,713
	Interest and other (income)/expense, net	(62		)	821			2,066
	Income/(loss) attributable to disposed properties and assets held for sale	3,493			15,054			22,164
	Net gain/(loss) on the sale of depreciable property	41,919			260,404			138,508
	Impairment charges	(2,355		)	—			—
	Income tax benefit/(expense)	885			(8,850		)	(13,218		)
	Income/(loss) from discontinued operations, net of tax	$	43,942		$	266,608		$	147,454
	Income/(loss) from discontinued operations attributable to UDR, Inc.	$	42,364		$	256,533		$	142,122
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, 2013, 2012, and 2011 (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Rental income	$	8,989		$	15,745		$	42,120
	Rental expenses	3,149			5,444			15,734
	Property management	247			432			1,160
	Real estate depreciation	1,935			3,320			13,503
	Interest	—			—			815
	Income/(loss) attributable to disposed properties	3,658			6,549			10,908
	Net gain/(loss) on the sale of depreciable properties	41,518			51,094			60,065
	Income/(loss) from discontinued operations	$	45,176		$	57,643		$	70,973

Debt_UNITED_DOMINION_REALTY_LP1

Debt (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
Secured debt instruments	'
	The following is a summary of our secured and unsecured debt at December 31, 2013 and 2012 (dollars in thousands):
		Principal Outstanding						For the Year Ended December 31, 2013
								Weighted Average			Weighted Average			Number of Communities
		December 31,						Interest Rate			Years to Maturity			Encumbered
		2013			2012
	Secured Debt:
	Fixed Rate Debt
	Mortgage notes payable (a)	$	445,706		$	455,533		5.44	%		2.5			8
	Fannie Mae credit facilities (b)	626,667			631,078			4.99	%		5			22
	Total fixed rate secured debt	1,072,373			1,086,611			5.18	%		4			30
	Variable Rate Debt
	Mortgage notes payable	63,595			37,415			2.34	%		2.1			2
	Tax-exempt secured notes payable (c)	94,700			94,700			0.84	%		9.2			2
	Fannie Mae credit facilities (b)	211,409			211,409			1.61	%		6.5			7
	Total variable rate secured debt	369,704			343,524			1.54	%		6.5			11
	Total Secured Debt	1,442,077			1,430,135			4.24	%		4.6			41
	Unsecured Debt:
	Commercial Banks
	Borrowings outstanding under an unsecured credit facility due December 2017 (d), (i)	—			76,000			—			3.9
	Senior Unsecured Notes
	3.70% Medium-Term Notes due October 2020 (net of discount of $54) (g), (i)	299,946			—			3.7	%		6.8
	4.63% Medium-Term Notes due January 2022 (net of discount of $2,882 and $3,241) (i)	397,118			396,759			4.63	%		8
	1.42% Term Notes due June 2018 (e), (i)	35,000			35,000			1.42	%		4.4
	2.50% Term Notes due June 2018 (e), (i)	65,000			65,000			2.5	%		4.4
	6.05% Medium-Term Notes due June 2013	—			122,500			—			—
	5.13% Medium-Term Notes due January 2014 (h)	184,000			184,000			5.13	%		0
	5.50% Medium-Term Notes due April 2014 (net of discount of $20 and $89)	128,480			128,411			5.5	%		0.3
	5.25% Medium-Term Notes due January 2015 (net of discount of $134 and $262)	325,041			324,913			5.25	%		1
	5.25% Medium-Term Notes due January 2016	83,260			83,260			5.25	%		2
	2.73% Term Notes due June 2018 (f) (i)	250,000			250,000			2.73	%		4.4
	8.50% Debentures due September 2024	15,644			15,644			8.5	%		10.7
	4.25% Medium-Term Notes due June 2018 (net of discount of $1,893 and $2,322) (i)	298,107			297,678			4.25	%		4.4
	Other	30			33			N/A			N/A
	Total Unsecured Debt	2,081,626			1,979,198			4.35	%		4.2
	Total Debt	$	3,523,703		$	3,409,333		4.31	%		4.4
Secured credit facilities	'
	Further information related to these credit facilities is as follows (dollars in thousands):
		December 31, 2013			31-Dec-12
	Borrowings outstanding	$	838,076		$	842,487
	Weighted average borrowings during the period ended	839,597			903,817
	Maximum daily borrowings during the period ended	841,494			1,054,735
	Weighted average interest rate during the period ended	4.2		%	4.3		%
	Weighted average interest rate at the end of the period	4.1		%	4.4		%
Aggregate maturities of secured debt	'
	The aggregate maturities, including amortizing principal payments of secured debt, of total debt for the next five years subsequent to December 31, 2013 are as follows (dollars in thousands):
	Year		Total Fixed Secured Debt			Total Variable Secured Debt			Total Secured Debt				Total Unsecured Debt (a)			Total Debt
	2014		$	48,035		$	—		$	48,035			$	311,574		$	359,609
	2015		197,210			—			197,210				324,382			521,592
	2016		136,431			63,595			200,026				82,478			282,504
	2017		178,398			65,000			243,398				—			243,398
	2018		176,483			50,000			226,483				648,646			875,129
	Thereafter		335,816			191,109			526,925				714,546			1,241,471
	Total		$	1,072,373		$	369,704		$	1,442,077			$	2,081,626		$	3,523,703
	(a) With the exception of the 1.42% Term Notes due June 2018 and revolving credit facility which carry a variable interest rate, all unsecured debt carries fixed interest rates.
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
Secured debt instruments	'
	Secured debt consists of the following as of December 31, 2013 and 2012 (dollars in thousands):
		Principal Outstanding						For the Year Ended December 31, 2013
		December 31,						Weighted Average			Weighted Average			Number of Communities
		2013			2012			Interest Rate			Years to Maturity			Encumbered
	Fixed Rate Debt
	Mortgage notes payable	$	386,803		$	394,999		5.44	%		2.6			5
	Fannie Mae credit facilities	379,003			370,638			4.71	%		5.5			10
	Total fixed rate secured debt	765,806			765,637			5.08	%		4			15
	Variable Rate Debt
	Mortgage notes payable	—			37,415			—			—			—
	Tax-exempt secured note payable	27,000			27,000			0.95	%		18.2			1
	Fannie Mae credit facilities	142,059			137,187			1.9	%		7.7			5
	Total variable rate secured debt	169,059			201,602			1.75	%		9.4			6
	Total secured debt	$	934,865		$	967,239		4.47	%		5			21
Secured credit facilities	'
	The following is information related to the credit facilities allocated to the Operating Partnership:
		December 31, 2013			December 31, 2012
		(dollars in thousands)
	Borrowings outstanding	$	521,062		$	507,825
	Weighted average borrowings during the period ended	522,007			544,793
	Maximum daily borrowings during the period ended	523,187			635,762
	Weighted average interest rate during the period ended	4.2		%	4.3		%
	Interest rate at the end of the period	4.1		%	4.4		%
Aggregate maturities of secured debt	'
	The aggregate maturities of the Operating Partnership’s secured debt due during each of the next five calendar years subsequent to December 31, 2013 are as follows (dollars in thousands):
		Fixed						Variable
		Mortgage			Credit			Tax Exempt				Credit			Total
		Notes			Facilities			Notes Payable				Facilities
	2014	$	8,590		$	344		$	—			$	—		$	8,934
	2015	192,939			364			—				—			193,303
	2016	131,957			382			—				—			132,339
	2017	1,641			15,684			—				6,566			23,891
	2018	1,696			161,754			—				46,272			209,722
	Thereafter	49,980			200,475			27,000				89,221			366,676
	Total	$	386,803		$	379,003		$	27,000			$	142,059		$	934,865

Fair_Value_of_Derivatives_and_3

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012 are summarized as follows (dollars in thousands):
						Fair Value at December 31, 2013, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2013		Fair Value Estimate at December 31, 2013		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs
						Assets or		Inputs		(Level 3)
						Liabilities		(Level 2)
						(Level 1)
	Description:
	Notes receivable (a)	$	83,033	$	83,833	$	—	$	—	$	83,833
	Total assets	$	83,033	$	83,833	$	—	$	—	$	83,833
	Derivatives - Interest rate contracts (b)	$	4,965	$	4,965	$	—	$	4,965	$	—
	Secured debt instruments - fixed rate: (c)
	Mortgage notes payable	445,706		466,375		—		—		466,375
	Fannie Mae credit facilities	626,667		661,094		—		—		661,094
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	63,595		63,595		—		—		63,595
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments (c):
	Senior unsecured notes	2,081,626		2,149,003		—		—		2,149,003
	Total liabilities	$	3,528,668	$	3,651,141	$	—	$	4,965	$	3,646,176
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	217,597	$	217,597	$	—	$	217,597	$	—
						Fair Value at December 31, 2012, Using
		Total Carrying Amount in Statement of Financial Position at December 31, 2012		Fair Value Estimate at December 31, 2012		Quoted Prices in		Significant		Significant
						Active Markets		Other		Unobservable
						for Identical		Observable		Inputs (Level 3)
						Assets or		Inputs (Level 2)
						Liabilities (Level 1)
	Description:
	Notes receivable (a)	$	64,006	$	64,930	$	—	$	—	64,930
	Derivatives- Interest rate contracts (b)	2		2		—		2		—
	Total assets	$	64,008	$	64,932	$	—	$	2	$	64,930
	Derivatives- Interest rate contracts (b)	$	11,022	$	11,022	$	—	$	11,022	$	—
	Secured debt instruments- fixed rate: (c)
	Mortgage notes payable	455,533		494,728		—		—		494,728
	Fannie Mae credit facilities	631,078		689,295		—		—		689,295
	Secured debt instruments- variable rate: (c)
	Mortgage notes payable	37,415		37,415		—		—		37,415
	Tax-exempt secured notes payable	94,700		94,700		—		—		94,700
	Fannie Mae credit facilities	211,409		211,409		—		—		211,409
	Unsecured debt instruments: (c)
	Commercial bank	76,000		76,000		—		—		76,000
	Senior unsecured notes	1,903,198		2,039,736		—		—		2,039,736
	Total liabilities	$	3,420,355	$	3,654,305	$	—	$	11,022	$	3,643,283
	Redeemable noncontrolling interests in the Operating Partnership (d)	$	223,418	$	223,418	$	—	$	223,418	$	—
	(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, 2013 and 2012 are summarized as follows (dollars in thousands):
						Fair Value at December 31, 2013, Using
		Total Carrying Amount in Statement of Financial Position at		Fair Value Estimate at		Quoted Prices in		Significant Other		Significant
						Active Markets		Observable		Unobservable
						for Identical		Inputs		Inputs
						Assets or		(Level 2)		(Level 3)
						Liabilities
		December 31, 2013		December 31, 2013		(Level 1)
	Description:
	Derivatives - Interest rate contracts (a)	$	2,731	$	2,731	$	—	$	2,731	$	—
	Secured debt instruments - fixed rate: (b)
	Mortgage notes payable	386,803		403,695		—		—		403,695
	Fannie Mae credit facilities	379,003		394,239		—		—		394,239
	Secured debt instruments - variable rate: (b)
	Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
	Fannie Mae credit facilities	142,059		142,059		—		—		142,059
	Total liabilities	$	937,596	$	969,724	$	—	$	2,731	$	966,993
						Fair Value at December 31, 2012, Using
		Total Carrying Amount in Statement of Financial Position at		Fair Value Estimate at		Quoted Prices in		Significant Other		Significant
						Active Markets		Observable		Unobservable
						for Identical		Inputs		Inputs
						Assets or		(Level 2)		(Level 3)
						Liabilities
		December 31, 2012		December 31, 2012		(Level 1)
	Description:
	Derivatives- Interest rate contracts (a)	$	2	$	2	$	—	$	2	$	—
	Total assets	$	2	$	2	$	—	$	2	$	—
	Derivatives- Interest rate contracts (a)	$	4,750	$	4,750	$	—	$	4,750	$	—
	Secured debt instruments- fixed rate: (b)
	Mortgage notes payable	394,999		429,973		—		—		429,973
	Fannie Mae credit facilities	370,638		399,389		—		—		399,389
	Secured debt instruments- variable rate: (b)
	Mortgage notes payable	37,415		37,415		—		—		37,415
	Tax-exempt secured notes payable	27,000		27,000		—		—		27,000
	Fannie Mae credit facilities	137,187		137,187		—		—		137,187
	Total liabilities	$	971,989	$	1,035,714	$	—	$	4,750	$	1,030,964
	(a)	See Note 8, Derivatives and Hedging Activity.
	(b)	See Note 5, Debt.

Derivatives_and_Hedging_Activi3

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013 and December 31, 2012:
	Offsetting of Derivative Assets
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Assets				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)				Financial Instruments				Cash Collateral Received				Net Amount
	December 31, 2013		$	—			$	—			$	—			$	—			$	—			$	—
	December 31, 2012		$	2			$	—			$	2			$	—			$	—			$	2
Outstanding interest rate derivatives	'
	As of December 31, 2013, the Company had the following outstanding interest rate derivatives that were designated as cash flow hedges of interest rate risk (dollars in thousands):
	Interest Rate Derivative		Number of Instruments		Notional
	Interest rate swaps		11		$	419,787
	Interest rate caps		5		$	274,291
	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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in a gain/(loss) of $271,000, $290,000, and $(23,000) for the years ended December 31, 2013, 2012, and 2011, respectively.
	As of December 31, 2013, 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		2		$	155,197
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, 2013 and 2012 (dollars in thousands):
		Asset Derivatives										Liability Derivatives
				Fair Value at:										Fair Value at:
		Balance		December 31,				December 31,				Balance		December 31,				December 31,
		Sheet Location		2013				2012				Sheet Location		2013				2012
	Derivatives designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	2			Other liabilities		$	4,965			$	11,022
	Total			$	—			$	2					$	4,965			$	11,022
	Derivatives not designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	—			Other liabilities		$	—			$	—
	Total			$	—			$	—					$	—			$	—
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, 2013, 2012, and 2011 (dollars in thousands):
			Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)												Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)		Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)											Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	Derivatives in Cash Flow Hedging Relationships		2013				2012				2011						2013				2012				2011				2013		2012		2011
	Interest rate products		$	(469	)		$	(4,924	)		$	(16,477	)		Interest expense		$	(6,851	)		$	(7,649	)		$	(9,132	)	Interest expense	$	—	$	—	$	(58	)
	Total		$	(469	)		$	(4,924	)		$	(16,477	)				$	(6,851	)		$	(7,649	)		$	(9,132	)		$	—	$	—	$	(58	)
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations	'
	Derivatives Not Designated as Hedging Instruments		Location of Gain or (Loss) Recognized in Income on Derivative		Amount of Gain or (Loss) Recognized in Income on Derivative
					2013				2012				2011
	Interest rate products		Interest and other income/(expense), net		$	271			$	290			$	(23	)
	Total				$	271			$	290			$	(23	)
Offsetting Liabilities [Table Text Block]	'
	Offsetting of Derivative Liabilities
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)				Financial Instruments				Cash Collateral Posted				Net Amount
	December 31, 2013		$	4,965			$	—			$	4,965			$	—			$	—			$	4,965
	December 31, 2012		$	11,022			$	—			$	11,022			$	—			$	—			$	11,022
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, 2013 and December 31, 2012:
	Offsetting of Derivative Assets
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Assets				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Assets Presented in the Consolidated Balance Sheets (a)				Financial Instruments				Cash Collateral Received				Net Amount
	December 31, 2013		$	—			$	—			$	—			$	—			$	—			$	—
	December 31, 2012		$	2			$	—			$	2			$	—			$	—			$	2
Outstanding interest rate derivatives	'
	As of December 31, 2013, the Operating Partnership had the following outstanding interest rate derivatives designated as cash flow hedges of interest rate risk (dollars in thousands):
	Interest Rate Derivative		Number of Instruments		Notional
	Interest rate swaps		2		$	96,974
	Interest rate caps		5		$	255,561
	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. Changes in the fair value of derivatives not designated in hedging relationships are recorded directly in earnings and resulted in losses of $9,000, $9,000, and $204,000 for the years ended December 31, 2013, 2012, and 2011, respectively.
	As of December 31, 2013, 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		1		$	83,289
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, 2013 and 2012 (dollars in thousands):
		Asset Derivatives										Liability Derivatives
				Fair Value at:										Fair Value at:
		Balance		December 31,				December 31,				Balance		December 31,				December 31,
		Sheet Location		2013				2012				Sheet Location		2013				2012
	Derivatives designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	2			Other liabilities		$	2,731			$	4,750
	Total			$	—			$	2					$	2,731			$	4,750
	Derivatives not designated as hedging instruments:
	Interest rate products	Other assets		$	—			$	—			Other liabilities		$	—			$	—
	Total			$	—			$	—					$	—			$	—
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, 2013, 2012, and 2011 (dollars in thousands):
			Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)									Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
	Derivatives in Cash Flow Hedging Relationships													Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
			2013				2012				2011			2013				2012				2011
	Interest rate products		$	(348	)		$	(1,898	)		($6,119)	Interest expense		$	(2,652	)		$	(3,431	)		$	(4,719	)
	Total		$	(348	)		$	(1,898	)		($6,119)			$	(2,652	)		$	(3,431	)		$	(4,719	)
Effect of Company's derivatives not designated as hedging instruments on the Consolidated Statements of Operations	'
		Derivatives Not Designated as Hedging Instruments		Location of Gain or (Loss) Recognized in Income on Derivative		Amount of Gain or (Loss) Recognized in Income on Derivative
						2013				2012				2011
		Interest rate products		Other operating expenses		$	(9	)		$	(9	)		$	(204	)
		Total				$	(9	)		$	(9	)		$	(204	)
Offsetting Liabilities [Table Text Block]	'
	Offsetting of Derivative Liabilities
															Gross Amounts Not Offset in the Consolidated Balance Sheets
			Gross Amounts of Recognized Liabilities				Gross Amounts Offset in the Consolidated Balance Sheets				Net Amounts of Liabilities Presented in the Consolidated Balance Sheets (b)				Financial Instruments				Cash Collateral Posted				Net Amount
	December 31, 2013		$	2,731			$	—			$	2,731			$	—			$	—			$	2,731
	December 31, 2012		$	4,750			$	—			$	4,750			$	—			$	—			$	4,750
	(b) Amounts reconcile to the aggregate fair value of derivative liabilities in the “Tabular Disclosure of Fair Values of Derivative Instruments on the Balance Sheet” located in this footnote.

Capital_Structure_UNITED_DOMIN1

Capital Structure (UNITED DOMINION REALTY, L.P.) Capital Structure (UNITED DOMINION REALTY, L.P.) (Tables) (United Dominion Reality L.P.)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011:
					UDR, Inc.
		Class A Limited	Limited		Limited		General	Total
		Partner	Partners		Partner		Partner
	Ending balance at December 31, 2010	1,751,671	3,310,298		174,736,557		110,883	179,909,409
	OP Units issued for acquisitions of real estate	—	4,371,845		—		—	4,371,845
	OP redemptions for UDR stock (1)	—	(12,511	)	12,511		—	—
	Ending balance at December 31, 2011	1,751,671	7,669,632		174,749,068		110,883	184,281,254
	OP redemptions for cash	—	(5,646	)	5,646		—	—
	OP redemptions for UDR stock	—	(20,438	)	20,438		—	—
	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	—	—		(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

Commitments_and_Contingencies_2

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
Summary of real estate commitments	'
	The following summarizes the Company’s real estate commitments at December 31, 2013 (dollars in thousands):
		Number of	Costs Incurred			Expected Costs			Average Ownership
		Properties	to Date			to Complete (unaudited)			Stake
	Wholly-owned — under development	6	$	467,413	(a)	$	230,137		100	%
	Wholly-owned — redevelopment	2	134,261		(a)	39,039			100	%
	Joint ventures:
	Unconsolidated joint ventures	2	160,738			130,182		(b)	51	%
	Participating loan investments	1	14,273			77,736		(c)	0	%
			$	776,685		$	477,094
United Dominion Reality L.P.	'
Entity Information [Line Items]	'
Summary of real estate commitments	'
	Real Estate Under Development
	The following summarizes the Operating Partnership’s real estate commitments at December 31, 2013 (dollars in thousands):
		Number of	Costs Incurred			Expected Costs
		Properties	to Date (a)			to Complete (unaudited)
	Real estate communities — under development	1	$	80,063		$	51,937
	Real estate communities — redevelopment	1	72,581			2,719
			$	152,644		$	54,656

Reportable_Segments_UNITED_DOM1

Reportable Segments (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
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, 2013, 2012, and 2011, and reconciles NOI to Net Income/(Loss) Attributable to UDR, Inc. in the Consolidated Statements of Operations (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Reportable apartment home segment rental income
	Same-Store Communities
	West Region	$	232,374		$	219,988		$	204,570
	Mid-Atlantic Region	166,518			161,991			152,833
	Northeast Region	58,073			54,460			37,553
	Southeast Region	116,192			110,461			105,004
	Southwest Region	40,576			38,099			35,266
	Non-Mature Communities/Other	141,903			159,245			195,732
	Total segment and consolidated rental income	$	755,636		$	744,244		$	730,958
	Reportable apartment home segment NOI
	Same-Store Communities
	West Region	$	165,657		$	154,496		$	141,797
	Mid-Atlantic Region	115,805			112,699			105,213
	Northeast Region	42,353			39,376			27,181
	Southeast Region	75,825			71,218			66,202
	Southwest Region	24,869			22,817			20,319
	Non-Mature Communities/Other	89,532			103,594			124,048
	Total segment and consolidated NOI	514,041			504,200			484,760
	Reconciling items:
	Joint venture management and other fees	12,442			11,911			9,668
	Property management	(20,780		)	(20,465		)	(20,101		)
	Other operating expenses	(7,136		)	(5,718		)	(6,118		)
	Real estate depreciation and amortization	(341,490		)	(350,401		)	(370,343		)
	General and administrative	(42,238		)	(43,792		)	(47,257		)
	Hurricane-related recoveries/(charges), net	12,253			(8,495		)	—
	Other depreciation and amortization	(6,741		)	(4,105		)	(3,931		)
	Income/(loss) from unconsolidated entities	(415		)	(8,579		)	(6,352		)
	Interest expense	(126,083		)	(138,792		)	(156,366		)
	Interest and other income/(expense), net	4,681			2,703			5,688
	Tax benefit, net	7,299			30,282			5,647
	Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership	(1,530		)	(7,986		)	(395		)
	Net (income)/loss attributable to noncontrolling interests	60			(140		)	(167		)
	Net gain/(loss) on sale of depreciable property, net of impairment and tax	40,449			251,554			125,290
	Net income/(loss) attributable to UDR, Inc.	$	44,812		$	212,177		$	20,023
Details of assets of UDR's reportable segments	'
	The following table details the assets of UDR’s reportable segments as of December 31, 2013 and 2012 (dollars in thousands):
		December 31,			December 31,
		2013			2012
	Reportable apartment home segment assets:
	Same-Store communities:
	West Region	$	2,323,850		$	2,325,934
	Mid-Atlantic Region	1,431,590			1,419,873
	Northeast Region	738,805			723,437
	Southeast Region	889,753			887,483
	Southwest Region	350,158			346,449
	Non-mature Communities/Other	2,473,821			2,352,652
	Total segment assets	8,207,977			8,055,828
	Accumulated depreciation	(2,208,794		)	(1,924,682		)
	Total segment assets — net book value	5,999,183			6,131,146
	Reconciling items:
	Cash and cash equivalents	30,249			12,115
	Restricted cash	22,796			23,561
	Deferred financing costs, net	26,924			24,990
	Notes receivable, net	83,033			64,006
	Investment in and advances to unconsolidated joint ventures, net	507,655			477,631
	Other assets	137,882			125,654
	Total consolidated assets	$	6,807,722		$	6,859,103
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, 2013, 2012, and 2011, and reconciles NOI to Net Income/(Loss) Attributable to OP Unitholders in the Consolidated Statements of Operations (dollars in thousands):
		Years Ended December 31,
		2013			2012			2011
	Reportable apartment home segment rental income
	Same-Store Communities
	West Region	$	175,384		$	166,181		$	156,587
	Mid-Atlantic Region	68,205			66,487			64,020
	Northeast Region	36,623			34,579			24,408
	Southeast Region	43,208			40,771			38,606
	Southwest Region	21,105			19,859			18,286
	Non-Mature Communities/Other	66,317			72,814			85,150
	Total segment and consolidated rental income	$	410,842		$	400,691		$	387,057
	Reportable apartment home segment NOI
	Same-Store Communities
	West Region	$	125,956		$	117,744		$	109,672
	Mid-Atlantic Region	46,770			45,801			44,400
	Northeast Region	27,149			25,653			17,829
	Southeast Region	28,105			26,510			24,212
	Southwest Region	13,293			12,225			10,994
	Non-Mature Communities/Other	46,262			53,605			57,151
	Total segment and consolidated NOI	287,535			281,538			264,258
	Reconciling items:
	Property management	(11,298		)	(11,019		)	(10,644		)
	Other operating expenses	(5,728		)	(5,272		)	(5,484		)
	Real estate depreciation and amortization	(181,302		)	(195,051		)	(197,964		)
	General and administrative	(24,808		)	(26,204		)	(26,370		)
	Hurricane-related recoveries/(charges), net	8,083			(5,518		)	—
	Interest expense	(36,058		)	(45,234		)	(53,632		)
	Net gain/(loss) on the sale of depreciable properties	41,518			51,094			60,065
	Net income/(loss) attributable to noncontrolling interests	(4,566		)	(352		)	(70		)
	Net income/(loss) attributable to OP unitholders	$	73,376		$	43,982		$	30,159
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, 2013 and 2012 (dollars in thousands):
		December 31,			December 31, 2012
		2013
	Reportable apartment home segment assets
	Same-Store Communities
	West Region	$	1,664,314		$	1,651,316
	Mid-Atlantic Region	706,447			701,741
	Northeast Region	443,483			434,138
	Southeast Region	328,150			322,882
	Southwest Region	186,934			185,501
	Non-Mature Communities/Other	859,152			887,342
	Total segment assets	4,188,480			4,182,920
	Accumulated depreciation	(1,241,574		)	(1,097,133		)
	Total segment assets - net book value	2,946,906			3,085,787
	Reconciling items:
	Cash and cash equivalents	1,897			2,804
	Restricted cash	13,526			12,926
	Deferred financing costs, net	5,848			6,072
	Other assets	25,064			28,665
	Total consolidated assets	$	2,993,241		$	3,136,254

Unaudited_Summarized_Consolida3

Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
Entity Information [Line Items]	'
Schedule of quarterly financial information	'
	Selected consolidated quarterly financial data for the years ended December 31, 2013 and 2012 is summarized in the table below (dollars in thousands, except per share amounts):
			Three Months Ended
			March 31,			June 30,			September 30,			December 31,
	2013
	Rental income (a)		$	181,961		$	186,285		$	187,917		$	190,321
	Income/(loss) from continuing operations		(1,162		)	4,525			2,351			(3,374		)
	Income/(loss) from discontinued operations, net of tax		853			829			884			41,376
	Net income/(loss) attributable to common stockholders		(1,199		)	4,261			2,257			35,769
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	(0.00	)	$	0.02		$	0.01		$	0.14
	2012
	Rental income (a)		$	169,950		$	175,153		$	179,448		$	180,150
	Income/(loss) from continuing operations		915			(23,961		)	(9,287		)	(13,972		)
	Income/(loss) from discontinued operations, net of tax		85,713			180,268			(389		)	1,016
	Net income/(loss) attributable to common stockholders		80,848			145,721			(9,962		)	(13,231		)
	Income/(loss) attributable to common stockholders per weighted average common share (b):
	Basic and diluted		$	0.37		$	0.62		$	(0.04	)	$	(0.05	)
	(a)	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
	(b)	Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.
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, 2013 and 2012 is summarized in the table blow (dollars in thousands, except per share amounts):
			Three Months Ended
			March 31,			June 30,			September 30,			December 31,
	2013
	Rental income (a)		$	97,770		$	100,421		$	101,558		$	102,104
	Income/(loss) from continuing operations		6,870			9,339			10,069			6,488
	Income/(loss) from discontinued operations		905			882			982			42,407
	Income/(loss) attributable to OP unitholders		7,729			10,154			11,011			44,482
	Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (b)		$	0.04		$	0.06		$	0.06		$	0.24
	2012
	Rental income (a)		$	93,659		$	95,766		$	97,974		$	97,547
	Income/(loss) from continuing operations		(8,690		)	(2,841		)	(532		)	(1,246		)
	Income/(loss) from discontinued operations		1,799			54,243			656			945
	Income/(loss) attributable to OP unitholders		(6,926		)	51,172			85			(349		)
	Income/(loss) attributable to OP unitholders per weighted average OP Unit — basic and diluted (b)		$	(0.04	)	$	0.28		$	0		$	(0.00	)
	(a)	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
	(b)	Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts due to rounding

IncomeLoss_Per_Share_UNITED_DO2

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Tables)	12 Months Ended
	Dec. 31, 2013
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):
		Years Ended December 31,
		2013			2012			2011
	Numerator for income/(loss) per share:
	Income/(loss) from continuing operations	$	2,340		$	(46,305	)	$	(126,869	)
	(Income)/loss from continuing operations attributable to redeemable noncontrolling interests in the Operating Partnership	48			2,089			4,937
	(Income)/loss from continuing operations attributable to noncontrolling interests	60			(140		)	(167		)
	Income/(loss) from continuing operations attributable to UDR, Inc.	2,448			(44,356		)	(122,099		)
	Distributions to preferred stockholders - Series E (Convertible)	(3,724		)	(3,724		)	(3,724		)
	Distributions to preferred stockholders - Series G	—			(2,286		)	(5,587		)
	Premium on preferred stock redemption or repurchases, net	—			(2,791		)	(175		)
	Income/(loss) from continuing operations attributable to common stockholders	$	(1,276	)	$	(53,157	)	$	(131,585	)
	Income/(loss) from discontinued operations, net of tax	$	43,942		$	266,608		$	147,454
	(Income)/loss from discontinued operations attributable to redeemable noncontrolling interests in the Operating Partnership	(1,578		)	(10,075		)	(5,332		)
	Income/(loss) from discontinued operations attributable to common stockholders	$	42,364		$	256,533		$	142,122
	Net income/(loss) attributable to common stockholders	$	41,088		$	203,376		$	10,537
	Denominator for income/(loss) per share - basic and diluted:
	Weighted average common shares outstanding	250,684			239,482			202,573
	Non-vested restricted stock awards	(715		)	(631		)	(1,279		)
	Denominator for income/(loss) per share - basic and diluted	249,969			238,851			201,294
	Income/(loss) per weighted average common share - basic and diluted:
	Income/(loss) from continuing operations attributable to common stockholders	$	(0.01	)	$	(0.22	)	$	(0.65	)
	Income/(loss) from discontinued operations attributable to common stockholders	$	0.17		$	1.07		$	0.71
	Net income/(loss) attributable to common stockholders	$	0.16		$	0.85		$	0.05
United Dominion Reality L P [Member]	'
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):
		Years Ended December 31,
		2013			2012			2011
	Numerator for income/(loss) per OP Unit — basic and diluted:
	Income/(loss) from continuing operations	$	32,766		$	(13,309	)	$	(40,744	)
	(Income)/loss from continuing operations attributable to noncontrolling interests	(4,114		)	(100		)	84
	Income/(loss) from continuing operations attributable to OP unitholders	$	28,652		$	(13,409	)	$	(40,660	)
	Income/(loss) from discontinued operations	$	45,176		$	57,643		$	70,973
	(Income)/loss from discontinued operations attributable to noncontrolling interests	(452		)	(252		)	(154		)
	Income/(loss) from discontinued operations attributable to OP unitholders	$	44,724		$	57,391		$	70,819
	Net income/(loss)	$	77,942		$	44,334		$	30,229
	Net (income)/loss attributable to noncontrolling interests	(4,566		)	(352		)	(70		)
	Net income/(loss) attributable to OP unitholders	$	73,376		$	43,982		$	30,159
	Denominator for income/(loss) per OP Unit — basic and diluted:
	Weighted average OP Units outstanding — basic and diluted	184,196			184,281			182,448
	Income/(loss) per weighted average OP Unit — basic and diluted:
	Income/(loss) from continuing operations attributable to OP unitholders	$	0.16		$	(0.07	)	$	(0.22	)
	Income/(loss) from discontinued operations attributable to OP unitholders	$	0.24		$	0.31		$	0.39
	Net income/(loss) attributable to OP unitholders	$	0.4		$	0.24		$	0.17

Consolidation_and_Basis_of_Pre2

Consolidation and Basis of Presentation (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
	Apartment_Homes
	Markets
	Communities
Consolidation And Basis Of Presentation (Textual) [Abstract]	'	'	'	'
Number of communities owned	141	'	'	'
Number of markets operating within	21	'	'	'
Number of apartments owned	41,250	'	'	'
Joint venture, number of homes in communities	9,909	'	'	'
Operating Partnership outstanding units	183,278,698	184,281,253	'	'
OP units outstanding related to general partner	173,959,774	174,886,035	'	'
Percentage of units owned by UDR	94.90%	94.90%	'	'
OP units outstanding related to limited partner	183,278,698	184,281,254	184,281,254	179,909,409
Non-affiliated Partners	'	'	'	'
Consolidation And Basis Of Presentation (Textual) [Abstract]	'	'	'	'
OP units outstanding related to limited partner	9,318,924	9,395,218	'	'
Percentage of units outstanding owned by limited partners	5.10%	5.10%	'	'

Significant_Accounting_Policie5

Significant Accounting Policies (Details) (USD $)

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

31-May-12

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

Note Due March 2014 Related Party [Domain]

Note Due March 2014 Related Party [Domain]

Note due October 2014 - related party

Note due October 2014 - related party

Note due February 2017

Note due February 2017

Note due June 2022 (net of discount of $283)

Note due June 2022 (net of discount of $283)

Other

Other

OP Units

OP Units

OP Units

Preferred Stock

Preferred Stock

Preferred Stock

Stock options and unvested restricted stock

Stock options and unvested restricted stock

Stock options and unvested restricted stock

Minimum

Minimum

Minimum

Maximum

Maximum

Maximum

RedeemableNoncontrollingInterest [Member]

RedeemableNoncontrollingInterest [Member]

RedeemableNoncontrollingInterest [Member]

Continuing Operations [Member]

Continuing Operations [Member]

Continuing Operations [Member]

Discontinued Operations [Member]

Discontinued Operations [Member]

Discontinued Operations [Member]

Lodge at Stoughton

Lodge at Stoughton

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

United Dominion Reality L P [Member]

Buildings

Building improvements

Furniture, fixtures, equipment, and other assets

Buildings

Building improvements

Furniture, fixtures, equipment, and other assets

Minimum

Minimum

Minimum

Maximum

Maximum

Maximum

Buildings

Building improvements

Furniture, fixtures, equipment, and other assets

Buildings

Building improvements

Furniture, fixtures, equipment, and other assets

Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Tax Liabilities, Net

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

'

'

Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

250,000

80,000

-404,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Significant Accounting Policies (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated useful lives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'35 years

'10 years

'3 years

'55 years

'35 years

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'35 years

'10 years

'3 years

'55 years

'35 years

'10 years

Net intangible assets

9,000,000

'

'

'

11,900,000

'

'

'

9,000,000

11,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,600,000

9,300,000

'

'

'

'

'

'

'

Net intangible liabilities

4,400,000

'

'

'

5,200,000

'

'

'

4,400,000

5,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,500,000

3,900,000

'

'

'

'

'

'

'

Development costs excluding direct costs and capitalized interest

'

'

'

'

'

'

'

'

11,100,000

10,000,000

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,500,000

2,100,000

2,200,000

'

'

'

'

'

'

Interest capitalized during period

'

'

'

'

'

'

'

'

29,400,000

26,400,000

13,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,900,000

3,700,000

1,800,000

'

'

'

'

'

'

Notes receivable interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.67%

'

0.00%

'

10.00%

'

7.00%

'

8.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes receivable

83,033,000

'

'

'

64,006,000

'

'

'

83,033,000

64,006,000

'

'

'

'

'

'

'

0

24,500,000

'

13,200,000

26,253,000

26,225,000

1,400,000

100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity Method Investment, Ownership Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

95.00%

'

'

'

'

'

'

'

'

'

Joint Venture Number of Operating Communities Owned

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

Bridge Loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,800,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,800,000

'

'

'

'

'

'

'

'

'

'

Initial Term of Bridge Loan

'3 months

'

'

'

'

'

'

'

'3 months

'

'

'

'

'

'

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'

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'

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'

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'

'

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'

'

'

'

'

'

'

Number of extension options on loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

Extension period of option on loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'3 months

'

'

'

'

'

'

'

'

'

'

Note receivable, unamortized discount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

247,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35000.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate Commitment on Note Receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

14,580,000

'

'

'

2,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note maturity public capital threshold

'

'

'

'

'

'

'

'

5,000,000

'

'

'

'

'

'

'

'

'

'

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Notes Receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,400,000

'

'

'

1,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

26,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount rate on note receivable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note receivable interest income

'

'

'

'

'

'

'

'

4,100,000

2,700,000

646,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of marketable securities

'

'

'

'

'

'

'

'

'

3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross realized gains

'

'

'

'

'

'

'

'

'

3,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain reclassified into earnings from other comprehensive income

'

'

'

'

'

'

'

'

0

0

3,492,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net tax liability

1,300,000

'

'

'

'

'

'

'

1,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred tax asset

32,273,000

'

'

'

24,175,000

'

'

'

32,273,000

24,175,000

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net of a valuation allowance

1,310,000

'

'

'

1,390,000

'

'

'

1,310,000

1,390,000

45,134,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Valuation Allowance, Deferred Tax Asset, Change in Amount

'

'

'

'

'

'

'

'

-100,000

-44,394,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income tax benefit resulting in change in valuation allowance

'

'

'

'

'

'

'

'

'

21,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Numerator for earnings per share b basic and diluted:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net (loss)/income attributable to common stockholders

35,769,000

2,257,000

4,261,000

-1,199,000

-13,231,000

-9,962,000

145,721,000

80,848,000

41,088,000

203,376,000

10,537,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average common shares outstanding

'

'

'

'

'

'

'

'

250,684,000

239,482,000

202,573,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Denominator for basic and diluted earnings per share

'

'

'

'

'

'

'

'

249,969,000

238,851,000

201,294,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income/(loss) attributable to common stockholders b basic and diluted (in dollars per share)

$0.14

[1]

$0.01

[1]

$0.02

[1]

($0.00)

[1]

($0.05)

[1]

($0.04)

[1]

$0.62

[1]

$0.37

[1]

$0.16

$0.85

$0.05

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Antidilutive securities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,337,464

9,411,415

7,602,000

3,035,548

3,035,548

3,036,000

1,583,537

1,361,398

2,153,739

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Advertising expense

'

'

'

'

'

'

'

'

5,700,000

6,200,000

5,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,500,000

2,400,000

2,500,000

'

'

'

'

'

'

Preferred stock, dividend rate

'

'

'

'

'

'

'

'

'

'

'

'

6.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares redeemed

'

'

'

'

'

'

'

'

'

'

'

3,264,362

3,264,362

141,200

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, redemption price per share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$25

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, redemption amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

82,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

(Decrease)/increase in net income (loss)

'

'

'

'

'

'

'

'

0

-2,791,000

-175,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Tax Expense (benefits), Discontinued Operations, Change in Valuation Allowance

'

'

'

'

'

'

'

'

'

-22,864,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Tax Expense (Benefit)

'

'

'

'

'

'

'

'

-8,281,000

-21,076,000

7,571,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-7,299,000

-30,282,000

-5,647,000

-982,000

9,641,000

13,218,000

'

'

'

'

'

'

'

'

'

'

'

Income Tax Examination, Likelihood of Unfavorable Settlement

'not (greater than 50 percent probability)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income Tax Examination, Penalties and Interest Accrued

0

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Available-for-sale Securities

'

'

'

'

'

'

'

'

0

0

9,799,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company

'

'

'

'

'

'

'

'

'

'

0.1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.1

'

'

'

'

'

'

Interest Income, Related Party

'

'

'

'

'

'

'

'

$765,000

$281,000

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.

Real_Estate_Owned_Details

Real Estate Owned (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
In Thousands, unless otherwise specified
Summary of carrying amounts for real estate owned (at cost)	'	'	'	'
Land and Land Improvements	$1,847,127	$1,884,403	'	'
Investment Building and Building Improvements, and Furniture, Fixtures and Equipment	5,876,717	5,591,368	'	'
Under development:	'	'	'	'
Under development	466,002	489,795	'	'
Sold or held for sale:	'	'	'	'
Sold or held for sale	10,800	'	'	'
Real estate owned	8,207,977	8,055,828	'	'
Accumulated depreciation	-2,208,794	-1,924,682	-1,831,727	-1,638,326
Total real estate owned, net of accumulated depreciation	5,999,183	6,131,146	'	'
Land	'	'	'	'
Under development:	'	'	'	'
Under development	110,769	151,154	'	'
Sold or held for sale:	'	'	'	'
Sold or held for sale	10,751	22,766	'	'
Construction in progress	'	'	'	'
Under development:	'	'	'	'
Under development	356,644	339,894	'	'
Building and improvements	'	'	'	'
Sold or held for sale:	'	'	'	'
Sold or held for sale	$5,969	$66,243	'	'

Real_Estate_Owned_Details_Text

Real Estate Owned (Details Textual) (USD $)

1 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Apr. 27, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Apartment_Homes

Apartment_Homes

Development Joint Venture [Member]

Development Joint Venture [Member]

Land Parcel [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Texas JV

Texas JV

Unconsolidated Joint Venture 399 Fremont [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Land

New York Properties [Member]

New York Properties [Member]

Hurricane Sandy [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Building and Building Improvements and Furniture Fixtures and Equipment [Domain]

Land

Land

Intangible Assets [Member]

Debt Assumed As Part of Acquisition [Member]

Communities

Communities

Corporate Joint Venture [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Texas JV

Texas JV

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Apartment_Homes

States

States

Communities

Apartment_Homes

Apartment_Homes

Communities

Apartment_Homes

Communities

acre

Communities

Apartment_Homes

Communities

Real Estate Properties [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impairment of Long-Lived Assets Held-for-use

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

$9,000,000

'

'

'

'

'

'

'

Real Estate Owned (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of owned and consolidated community by the Company

'

141

141

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of states in which there are owned and consolidated communities

'

10

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of apartment homes owned and consolidated by the Company

'

41,250

41,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity method investment, ownership percent

'

'

'

'

'

'

'

'

50.00%

'

80.00%

'

50.00%

50.00%

0.00%

20.00%

20.00%

'

'

51.00%

0.00%

'

'

'

'

'

'

'

'

'

'

Joint Venture Number of Operating Communities Owned

'

'

'

'

'

'

'

'

'

2

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint venture, number of homes in communities

'

9,909

9,909

'

'

'

'

'

'

633

633

'

739

739

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to acquire businesses and interest in affiliates

'

'

'

'

'

'

'

'

'

11,700,000

11,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of properties purchased

'

'

'

'

'

2

2

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Additions

'

'

129,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

38,800,000

78,000,000

102,100,000

1,500,000

38,100,000

Number of apartment homes acquired

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition-related costs

'

'

100,000

2,300,000

4,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Communities Owned

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

'

'

'

'

'

'

'

Number of Apartments Owned

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,706

'

'

'

'

'

'

'

Percentage of interest sold

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners

'

'

'

'

'

'

'

'

'

'

'

49.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance or Sale of Equity

'

'

'

'

'

'

'

'

'

'

'

29,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase Obligation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

318,000,000

'

'

'

'

'

Number of Units in Real Estate Property

'

'

'

'

'

'

'

'

'

'

'

'

739

739

'

3,359

'

391

391

447

'

'

'

'

'

'

'

'

'

'

'

Number of partnerships of sold interests

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Real Estate and Real Estate Joint Ventures

141,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transaction costs of selling interest in partnerships

936,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Real Estate Properties

'

'

'

'

'

'

'

'

'

'

'

'

2

2

'

8

'

1

1

1

'

6

'

'

'

'

'

'

'

'

'

Number of apartments of development community

'

391

391

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of developable acres

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

28.4

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Other Real Estate

436,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other Cost and Expense, Operating

'

'

7,136,000

5,718,000

6,118,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,400,000

'

'

'

'

'

'

'

Total Estimated Insurance Recovery

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$14,500,000

'

'

'

'

'

'

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Communities								Communities	Apartment_Homes	Apartment_Homes
									Apartment_Homes	Communities	Communities
Discontinued Operations (Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Discontinued operations, number of communities sold	'	'	'	'	'	'	'	'	2	21	18
Discontinued operations, number of apartment homes sold	'	'	'	'	'	'	'	'	914	6,507	4,488
Proceeds from Sale of Property, Plant, and Equipment	'	'	'	'	'	'	'	'	$81,100,000	$609,400,000	$593,400,000
Number of communities sold	'	'	'	'	'	'	'	'	'	6	'
Number of apartment homes sold	'	'	'	'	'	'	'	'	'	1,418	'
Number of communities held for sale	1	'	'	'	'	'	'	'	1	'	'
Real Estate Held-for-sale	10,800,000	'	'	'	'	'	'	'	10,800,000	'	'
Impairment of Long-Lived Assets to be Disposed of, net of tax	'	'	'	'	'	'	'	'	1,470,000	0	0
Summary of income from discontinued operations	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	9,152,000	39,543,000	117,269,000
Rental expenses	'	'	'	'	'	'	'	'	3,511,000	14,106,000	44,100,000
Property management fee	'	'	'	'	'	'	'	'	252,000	1,087,000	3,226,000
Real estate depreciation	'	'	'	'	'	'	'	'	1,958,000	8,475,000	45,713,000
Interest	'	'	'	'	'	'	'	'	-62,000	821,000	2,066,000
Income before net gain on the sale of property	'	'	'	'	'	'	'	'	3,493,000	15,054,000	22,164,000
Net (loss)/gain on the sale of depreciable property	'	'	'	'	'	'	'	'	41,919,000	260,404,000	138,508,000
Impairment of Long-Lived Assets to be Disposed of	'	'	'	'	'	'	'	'	-2,355,000	0	0
Income tax expense	'	'	'	'	'	'	'	'	885,000	-8,850,000	-13,218,000
(Loss)/income from discontinued operations	41,376,000	884,000	829,000	853,000	1,016,000	-389,000	180,268,000	85,713,000	43,942,000	266,608,000	147,454,000
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent	'	'	'	'	'	'	'	'	$42,364,000	$256,533,000	$142,122,000

Joint_Ventures_Details

Joint Ventures (Details) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jan. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

MetLife I

MetLife I

MetLife I

MetLife I

MetLife I

MetLife I

MetLife II

MetLife II

MetLife II

MetLife II

MetLife II

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Lodge at Stoughton

Lodge at Stoughton

Lodge at Stoughton

KFH

KFH

KFH

KFH

Texas JV

Texas JV

Texas JV

Texas JV

13th & Market

13th & Market

Domain College Park

Domain College Park

399 Fremont

Unconsolidated Joint Ventures [Member]

Unconsolidated Joint Ventures [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Operating Community [Member]

Operating Community [Member]

Land Parcel

Land Parcel

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Development Community [Member]

Development Community [Member]

Land Parcel

Development Community [Member]

Development Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Communities

Land_Parcels

Communities

Apartment_Homes

Communities

Apartment_Homes

Communities

Communities

Communities

Communities

Apartment_Homes

Apartment_Homes

Apartment_Homes

Communities

Apartment_Homes

Apartment_Homes

Apartment_Homes

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Real Estate Properties

'

'

'

'

8

'

7

'

'

'

'

15

'

'

'

2

2

'

1

1

6

'

1

'

'

'

'

'

'

3

'

'

'

8

'

'

'

'

'

'

'

'

'

'

'

'

Number of Units in Real Estate Property

'

'

'

'

1,641

'

'

'

'

'

'

3,119

'

'

'

739

739

'

391

391

'

'

447

'

'

'

'

'

'

660

'

'

'

3,359

'

'

'

'

'

'

'

'

'

218

'

'

Investment in unconsolidated joint ventures

$507,655,000

$477,631,000

$47,497,000

$74,964,000

$47,497,000

$74,964,000

'

'

$327,926,000

$326,600,000

'

$327,926,000

$326,600,000

$79,318,000

$0

'

$79,318,000

$0

'

'

'

$31,100,000

$36,313,000

$0

'

$0

$16,311,000

$25,919,000

$29,589,000

$25,919,000

$29,589,000

($23,591,000)

($25,309,000)

($23,591,000)

($25,309,000)

$0

$29,930,000

$0

$25,546,000

$55,500,000

$493,382,000

$477,631,000

'

$14,273,000

$0

'

Participating Loan, Interest Rate, Stated Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.50%

'

'

Participating Loan Years to Maturity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years 9 months 18 days

'

'

Income from Participating Loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

156,000

156,000

0

0

Equity method investment, ownership percent

'

'

'

'

13.20%

13.30%

4.00%

4.30%

'

'

50.00%

50.00%

50.00%

50.00%

'

50.00%

50.00%

0.00%

'

'

'

'

51.00%

0.00%

95.00%

0.00%

95.00%

30.00%

'

30.00%

30.00%

'

'

20.00%

20.00%

0.00%

95.00%

0.00%

95.00%

'

'

'

'

'

'

'

Deferred Gain on Sale of Property

$25,443,000

$29,406,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$24,000,000

$28,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint_Ventures_Details_1

Joint Ventures (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	$233,956,000	$201,969,000	$89,499,000
Real estate depreciation and amortization	83,776,000	85,754,000	38,049,000
Net loss	-36,075,000	-3,957,000	-23,021,000
UDR recorded loss from unconsolidated entities	-415,000	-8,579,000	-6,352,000
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	243,755,000	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	3,124,178,000	2,891,926,000	'
Total assets	3,198,204,000	3,207,968,000	'
Amount due to UDR	12,187,000	7,229,000	'
Third party debt	1,722,960,000	1,545,632,000	'
Total liabilities	1,776,709,000	1,720,328,000	'
Total equity	1,421,495,000	1,487,640,000	'
Investment in unconsolidated joint ventures	507,655,000	477,631,000	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	120,277,000	'
Property operating expenses	91,239,000	76,073,000	49,274,000
Operating income/(loss)	58,941,000	40,142,000	2,176,000
Interest expense	-73,555,000	-65,050,000	-29,985,000
Other income/(expense)	4,000	-14,000	-154,000
Income/(loss) from discontinued operations	-21,465,000	20,965,000	4,942,000
Cash and cash equivalents	41,792,000	41,409,000	'
Other assets	32,234,000	30,878,000	'
Accounts payable and accrued liabilities	41,562,000	47,190,000	'
MetLife I	'	'	'
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	52,532,000	56,099,000	48,628,000
Real estate depreciation and amortization	14,150,000	16,310,000	15,699,000
Net loss	-22,433,000	8,865,000	-692,000
UDR recorded loss from unconsolidated entities	-4,675,000	-1,750,000	-904,000
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	243,755,000	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	830,813,000	945,784,000	'
Total assets	849,485,000	1,212,532,000	'
Amount due to UDR	5,941,000	1,456,000	'
Third party debt	339,365,000	385,391,000	'
Total liabilities	351,419,000	488,814,000	'
Total equity	498,066,000	723,718,000	'
Investment in unconsolidated joint ventures	47,497,000	74,964,000	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	89,640,000	'
Property operating expenses	24,191,000	25,084,000	25,297,000
Operating income/(loss)	14,191,000	14,705,000	7,632,000
Interest expense	-15,162,000	-16,725,000	-15,416,000
Other income/(expense)	3,000	-5,000	-154,000
Income/(loss) from discontinued operations	-21,465,000	10,890,000	7,246,000
Cash and cash equivalents	7,817,000	13,496,000	'
Other assets	10,855,000	9,497,000	'
Accounts payable and accrued liabilities	6,113,000	12,327,000	'
MetLife II	'	'	'
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	109,926,000	87,386,000	0
Real estate depreciation and amortization	30,122,000	32,553,000	0
Net loss	8,941,000	-83,000	0
UDR recorded loss from unconsolidated entities	4,471,000	15,000	0
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	0	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	1,476,588,000	1,346,698,000	'
Total assets	1,509,708,000	1,373,916,000	'
Amount due to UDR	2,275,000	3,979,000	'
Third party debt	877,799,000	775,444,000	'
Total liabilities	894,582,000	795,038,000	'
Total equity	615,126,000	578,878,000	'
Investment in unconsolidated joint ventures	327,926,000	326,600,000	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	0	'
Property operating expenses	33,809,000	25,737,000	0
Operating income/(loss)	45,995,000	29,096,000	0
Interest expense	-37,055,000	-29,170,000	0
Other income/(expense)	1,000	-9,000	0
Income/(loss) from discontinued operations	0	0	0
Cash and cash equivalents	16,454,000	13,002,000	'
Other assets	16,666,000	14,216,000	'
Accounts payable and accrued liabilities	14,508,000	15,615,000	'
Unconsolidated Joint Venture Vitruvian Park [Member]	'	'	'
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	7,680,000	0	0
Real estate depreciation and amortization	3,830,000	0	0
Net loss	-2,669,000	0	0
UDR recorded loss from unconsolidated entities	-2,851,000	0	0
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	0	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	283,878,000	0	'
Total assets	288,954,000	0	'
Amount due to UDR	1,352,000	0	'
Third party debt	120,999,000	0	'
Total liabilities	129,503,000	0	'
Total equity	159,451,000	0	'
Investment in unconsolidated joint ventures	79,318,000	0	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	0	'
Property operating expenses	4,633,000	0	0
Operating income/(loss)	-783,000	0	0
Interest expense	-1,886,000	0	0
Other income/(expense)	0	0	0
Income/(loss) from discontinued operations	0	0	0
Cash and cash equivalents	3,498,000	0	'
Other assets	1,578,000	0	'
Accounts payable and accrued liabilities	7,152,000	0	'
Texas JV	'	'	'
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	39,273,000	37,090,000	35,130,000
Real estate depreciation and amortization	17,911,000	18,448,000	18,040,000
Net loss	-9,584,000	-1,040,000	-13,631,000
UDR recorded loss from unconsolidated entities	-1,218,000	-2,399,000	-2,726,000
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	0	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	218,669,000	232,733,000	'
Total assets	231,981,000	247,222,000	'
Amount due to UDR	1,063,000	1,150,000	'
Third party debt	219,588,000	219,588,000	'
Total liabilities	230,393,000	231,794,000	'
Total equity	1,588,000	15,428,000	'
Investment in unconsolidated joint ventures	-23,591,000	-25,309,000	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	0	'
Property operating expenses	18,279,000	17,053,000	16,202,000
Operating income/(loss)	3,083,000	1,589,000	888,000
Interest expense	-12,667,000	-12,704,000	-12,651,000
Other income/(expense)	0	0	0
Income/(loss) from discontinued operations	0	10,075,000	-1,868,000
Cash and cash equivalents	11,734,000	11,002,000	'
Other assets	1,578,000	3,487,000	'
Accounts payable and accrued liabilities	9,742,000	11,056,000	'
KFH	'	'	'
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	19,221,000	18,670,000	5,741,000
Real estate depreciation and amortization	14,199,000	16,546,000	4,310,000
Net loss	-7,885,000	-10,597,000	-8,262,000
UDR recorded loss from unconsolidated entities	-2,366,000	-3,221,000	-2,437,000
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	0	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	249,097,000	260,911,000	'
Total assets	252,860,000	265,402,000	'
Amount due to UDR	420,000	443,000	'
Third party debt	165,209,000	165,209,000	'
Total liabilities	166,863,000	167,144,000	'
Total equity	85,997,000	98,258,000	'
Investment in unconsolidated joint ventures	25,919,000	29,589,000	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	0	'
Property operating expenses	7,035,000	6,831,000	7,775,000
Operating income/(loss)	-2,013,000	-4,707,000	-6,344,000
Interest expense	-5,872,000	-5,890,000	-1,918,000
Other income/(expense)	0	0	0
Income/(loss) from discontinued operations	0	0	0
Cash and cash equivalents	2,289,000	2,697,000	'
Other assets	1,474,000	1,794,000	'
Accounts payable and accrued liabilities	1,234,000	1,492,000	'
Unconsolidated Other Joint Ventures [Domain]	'	'	'
Financial information relating to unconsolidated joint ventures operations	'	'	'
Revenues	5,324,000	2,724,000	0
Real estate depreciation and amortization	3,564,000	1,897,000	0
Net loss	-2,445,000	-1,102,000	-436,000
UDR recorded loss from unconsolidated entities	6,224,000	-1,224,000	-285,000
Equity Method Investment Summarized Financial Information Real Estate Held for Sale	'	0	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Real estate, net	65,133,000	105,800,000	'
Total assets	65,216,000	108,896,000	'
Amount due to UDR	1,136,000	201,000	'
Third party debt	0	0	'
Total liabilities	3,949,000	37,538,000	'
Total equity	61,267,000	71,358,000	'
Investment in unconsolidated joint ventures	50,586,000	71,787,000	'
Equity Method Investment Summarized Financial Information Third Party Debt Related to Real Estate Held for Sale	'	30,637,000	'
Property operating expenses	3,292,000	1,368,000	0
Operating income/(loss)	-1,532,000	-541,000	0
Interest expense	-913,000	-561,000	0
Other income/(expense)	0	0	0
Income/(loss) from discontinued operations	0	0	-436,000
Cash and cash equivalents	0	1,212,000	'
Other assets	83,000	1,884,000	'
Accounts payable and accrued liabilities	2,813,000	6,700,000	'
Unconsolidated Joint Ventures [Member]	'	'	'
Combined summary of balance sheets relating to unconsolidated joint ventures	'	'	'
Investment in unconsolidated joint ventures	$493,382,000	$477,631,000	'

Joint_Ventures_Details_Textual

Joint Ventures (Details Textual) (USD $)

1 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

1 Months Ended

1 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 31, 2014

Dec. 31, 2013

31-May-12

Mar. 31, 2014

Dec. 31, 2012

Dec. 31, 2012

Jun. 30, 2013

Dec. 31, 2013

Nov. 30, 2012

Nov. 30, 2012

Nov. 30, 2012

Jan. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jan. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Jan. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Jan. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Apr. 27, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Apartment_Homes

Apartment_Homes

Pier 4

Pier 4

Land

Land

Intangible Assets

Denver and San Diego Operating Communities [Member]

Denver and San Diego Operating Communities [Member]

Number of operating communities exchanged

Operating property the Olivian

Number of parcels exchanged

13th & Market [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

MetLife I

MetLife I

MetLife I

MetLife I

MetLife I

MetLife II

MetLife II

MetLife II

399 Fremont

399 Fremont

399 Fremont

399 Fremont

Pier 4

3032 Wilshire

3032 Wilshire

3032 Wilshire

Lodge at Stoughton

Lodge at Stoughton

KFH

KFH

Texas JV

Texas JV

Texas JV

13th & Market

13th & Market

Domain College Park

Domain College Park

Orange County, CA

Domain College Park [Member]

Domain College Park [Member]

Domain College Park [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Operating Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Development Community [Member]

Ownership interest of Company in Partnership [Member]

Ownership interest of Company in Partnership [Member]

Ownership interest of Company in Partnership [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Lodge at Stoughton

Communities

Buildings

Intangible Assets

Communities

1st payment

2nd payment

Consolidated Joint Venture 3032 Wilshire

Consolidated Joint Venture 2919 Wilshire

Corporate Joint Venture [Member]

Communities

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

MetLife I

MetLife I

MetLife II

MetLife II

Lodge at Stoughton

Lodge at Stoughton

KFH

KFH

Texas JV

Texas JV

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

13th & Market

13th & Market

Domain College Park

Domain College Park

Unconsolidated Joint Venture 399 Fremont [Member]

Unconsolidated Joint Venture 399 Fremont [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Participating Loan Investment Steele Creek Denver Colorado [Member]

Unconsolidated Joint Venture Vitruvian Park [Member]

Operating Community [Member]

Development Community [Member]

property

Communities

Apartment_Homes

Apartment_Homes

Apartment_Homes

Apartment_Homes

Communities

Apartment_Homes

Apartment_Homes

Apartment_Homes

Communities

Communities

Communities

Communities

Apartment_Homes

Communities

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of apartments of development community

'

391

391

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint Ventures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership of Consolidated Joint Ventures

'

'

'less than 100%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Real Estate Investment Property, Net

'

$5,523,029,000

$5,523,029,000

$5,591,732,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt associated with Real estate acquired

'

63,600,000

63,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint venture, number of homes in communities

'

9,909

9,909

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

633

'

633

'

'

'

'

173

'

'

'

'

'

'

739

739

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contribution made by company

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Controlling interest in consolidated joint venture

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

90.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum number of days within which criteria is to met

'

'

'

'730 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional contribution made by company

'

'

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of underlying property

'

'

'

'

9,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of underlying property upon completion of the entitlement process

'

'

'

'

12,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for interest in joint venture

'

'

'

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,500,000

4,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest in joint venture purchased

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Initial investment in equity method investment

'

80,200,000

80,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

327,100,000

'

'

'

37,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership percentage

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

5.00%

'

'

'

'

0.00%

5.00%

49.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property, Plant and Equipment, Additions

'

'

129,400,000

'

'

'

'

'

78,000,000

102,100,000

1,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase Obligation

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

108,000,000

318,000,000

'

Proceeds from Issuance or Sale of Equity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Units in Real Estate Property

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

739

739

'

1,641

'

3,119

'

'

'

660

'

3,359

'

'

391

391

'

'

'

'

447

'

218

'

'

'

'

'

'

'

'

'

'

Maximum Percentage to Finance

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

92,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average interest rate at the end of the period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Participating Interest in Investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating communities in joint venture

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7

'

'

12

'

'

'

'

'

'

'

'

'

'

1

'

'

'

2

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating communities transferred from existing ventures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity method investment, ownership percent

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

50.00%

'

'

50.00%

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

95.00%

30.00%

'

'

'

80.00%

'

'

'

'

'

'

'

'

'

'

'

50.00%

50.00%

0.00%

13.20%

13.30%

50.00%

50.00%

0.00%

95.00%

30.00%

30.00%

20.00%

20.00%

'

'

'

0.00%

95.00%

0.00%

95.00%

51.00%

0.00%

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Equity Method Investments

'

'

48,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Bargain Purchase, Gain Recognized, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bridge Loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loans Receivable, Description of Variable Rate Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'350

Unamortized discount

'

11,800,000

11,800,000

16,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

First installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture

'

359,609,000

359,609,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Second installment of payable incurred in partial consideration for acquisition of ownership interest in joint venture

'

521,592,000

521,592,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense incurred during period

'

'

126,083,000

138,792,000

156,366,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Company's equity investment in joint venture

'

507,655,000

507,655,000

477,631,000

'

'

26,600,000

'

'

'

'

'

'

'

'

'

'

79,318,000

0

47,497,000

74,964,000

'

'

'

'

327,926,000

326,600,000

55,500,000

'

'

'

'

'

'

'

'

'

25,919,000

29,589,000

-25,309,000

-23,591,000

'

'

'

'

'

'

'

'

'

31,100,000

'

'

'

79,318,000

0

47,497,000

74,964,000

327,926,000

326,600,000

0

16,311,000

25,919,000

29,589,000

-23,591,000

-25,309,000

'

'

'

0

29,930,000

0

25,546,000

36,313,000

0

14,273,000

0

'

'

'

'

'

'

'

'

'

Income from Participating Loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

156,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

156,000

0

0

'

'

'

'

'

'

'

'

Amortization period attributable to adjustment to UDR's proportionate share in partnership's assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'45 years

'11 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest in underlying assets exchanged

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

12.00%

'

3.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating communities in equity method investment exchange

'

'

'

'

'

'

'

'

'

'

'

2

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of land parcels in equity method investment exchange

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash paid in equity method investment exchange

15,600,000

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership interest acquired in exchange

'

'

'

'

'

'

'

'

'

'

'

35.00%

'

'

41.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average interest rate

'

4.31%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating communities, new properties

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Real estate investments, joint ventures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

637,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to acquire equity method investments

'

'

43,291,000

283,369,000

104,311,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

293,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Equity transferred value, equity method investment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

33,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for (proceeds from) deposits on real estate acquisitions

'

'

0

0

80,397,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-controlling interest held in joint venture

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

92.50%

'

'

98.00%

95.00%

'

'

95.00%

95.00%

30.00%

30.00%

'

'

'

95.00%

95.00%

95.00%

95.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Initial investment in consolidated joint venture

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,300,000

7,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Joint venture investment in multifamily properties

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

450,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of apartment homes in operating communities acquired

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total equity contribution by partners when fully invested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

180,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

UDR's equity investment in joint venture when fully invested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

54,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business combination, step acquisition, equity interest in acquiree, percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

80.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to acquire businesses and interest in affiliates

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11,700,000

'

11,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net gain on the sale of depreciable property

'

'

41,919,000

260,404,000

138,508,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred fees and gains on the sale of depreciable property

'

25,443,000

25,443,000

29,406,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

28,500,000

24,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Management fees for our involvement in the joint ventures

'

'

11,200,000

11,800,000

9,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Real Estate Owned Gross

'

8,207,977,000

8,207,977,000

8,055,828,000

'

'

'

'

'

'

'

'

796,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

145,000,000

'

'

'

'

'

Secured debt

'

1,442,077,000

1,442,077,000

1,430,135,000

'

'

'

'

'

'

'

'

444,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

118,300,000

62,800,000

'

'

'

'

'

Percentage of interest sold

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of partnerships of sold interests

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Real Estate and Real Estate Joint Ventures

141,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Sale of Other Real Estate

436,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

SEC Schedule III, Real Estate, Cost of Real Estate Sold

140,000,000

'

70,687,000

559,154,000

587,101,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of real estate retained in sale of real estate owned

'

5000.00%

5000.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

58,700,000

'

'

'

'

'

'

'

Number of Real Estate Properties

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

2

'

8

'

15

'

'

'

3

'

8

'

'

1

1

'

'

'

'

1

'

'

'

'

'

'

'

'

'

1

'

'

Stated interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.00%

'

'

'

'

'

'

Debt Instrument, Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'2 years

'

'

'

Debt Instrument, Description of Variable Rate Basis

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'175

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of extension options on loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Extension period of option on loan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High

'

'

'

'

$3,000,000

$4,000,000

'

'

'

'

'

'

'

'

'

'

$2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured_Debt_and_Unsecured_Deb2

Secured Debt and Unsecured Debt (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013		Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]	'		'		'
Unamortized discount	$11,800,000		$11,800,000		$16,900,000
Weighted Average Interest Rate	4.31%		'		'
Weighted Average Years to Maturity	'		'4 years 4 months 26 days		'
Borrowings outstanding	838,100,000		838,100,000		'
Senior Unsecured Notes	250,000,000		250,000,000		'
Total Unsecured Debt	2,081,626,000		2,081,626,000		1,979,198,000
Total Debt	3,523,703,000		3,523,703,000		3,409,333,000
Fixed Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	1,072,373,000		1,072,373,000		1,086,611,000
Weighted Average Interest Rate	5.18%		'		'
Weighted Average Years to Maturity	'		'3 years 11 months 12 days		'
Number of Communities Encumbered	'		30		'
Variable Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	369,704,000		369,704,000		343,524,000
Weighted Average Interest Rate	1.54%		'		'
Weighted Average Years to Maturity	'		'6 years 6 months 12 days		'
Number of Communities Encumbered	'		11		'
Secured Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	1,442,077,000		1,442,077,000		1,430,135,000
Weighted Average Interest Rate	4.24%		'		'
Weighted Average Years to Maturity	'		'4 years 7 months 6 days		'
Number of Communities Encumbered	'		41		'
Total Debt	1,442,077,000		1,442,077,000		'
Secured Debt | Fixed Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Total Debt	1,072,373,000		1,072,373,000		'
Secured Debt | Variable Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Total Debt	369,704,000		369,704,000		'
Mortgage notes payable | Fixed Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	445,706,000		445,706,000		455,533,000
Weighted Average Interest Rate	5.44%		'		'
Weighted Average Years to Maturity	'		'2 years 6 months		'
Number of Communities Encumbered	8		'		'
Mortgage notes payable | Variable Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	63,595,000		63,595,000		37,415,000
Weighted Average Interest Rate	2.34%		'		'
Weighted Average Years to Maturity	'		'2 years 1 month 6 days		'
Number of Communities Encumbered	2		'		'
Tax-exempt secured notes payable | Variable Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	94,700,000		94,700,000		94,700,000
Weighted Average Interest Rate	0.84%		'		'
Weighted Average Years to Maturity	'		'9 years 2 months 12 days		'
Number of Communities Encumbered	2		'		'
Fannie Mae credit facilities | Fixed Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	'		'		631,078,000
Debt, Weighted Average Interest Rate	4.99%		4.99%		'
Weighted Average Years to Maturity	'		'5 years		'
Number of Communities Encumbered	22		'		'
Fannie Mae credit facilities | Variable Rate Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Principal outstanding	211,409,000		211,409,000		211,409,000
Debt Instrument, Interest Rate at Period End	1.61%		1.61%		'
Weighted Average Years to Maturity	'		'6 years 6 months		'
Number of Communities Encumbered	7		'		'
Unsecured Debt	'		'		'
Debt Instrument [Line Items]	'		'		'
Weighted Average Interest Rate	4.35%		'		'
Weighted Average Years to Maturity	'		'4 years 2 months 26 days		'
Total Unsecured Debt	2,081,626,000		2,081,626,000		1,979,198,000
Total Debt	2,081,626,000	[1]	2,081,626,000	[1]	'
Borrowings outstanding under an unsecured credit facility due October 2015	'		'		'
Debt Instrument [Line Items]	'		'		'
Weighted Average Interest Rate	0.00%		'		'
Weighted Average Years to Maturity	'		'3 years 11 months 4 days		'
Borrowings outstanding	0		0		76,000,000
ThreePointSevenTermNotesDueOctober2020 [Member]	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	3.70%		3.70%		'
Unamortized discount	54,000		54,000		'
Weighted Average Interest Rate	'		3.70%		'
Weighted Average Years to Maturity	'		'6 years 9 months		'
Senior Unsecured Notes	299,946,000		299,946,000		0
4.63% Medium-Term Notes due January 2022	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	4.63%		4.63%		'
Unamortized discount	2,972,000		2,972,000		'
Weighted Average Interest Rate	4.63%		'		'
Weighted Average Years to Maturity	'		'8 years		'
Senior Unsecured Notes	397,118,000		397,118,000		396,759,000
1.67% Term Notes due December 2016	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	1.42%		1.42%		'
Weighted Average Interest Rate	1.42%		'		'
Weighted Average Years to Maturity	'		'4 years 5 months 4 days		'
Senior Unsecured Notes	35,000,000		35,000,000		35,000,000
2.68% Term Notes due December 2016	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	2.50%		2.50%		'
Weighted Average Interest Rate	2.50%		'		'
Weighted Average Years to Maturity	'		'4 years 5 months 4 days		'
Senior Unsecured Notes	65,000,000		65,000,000		65,000,000
6.05% Medium-Term Notes due June 2013	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	6.05%		6.05%		'
Weighted Average Years to Maturity	'		'0 years		'
Senior Unsecured Notes	0		0		122,500,000
5.13% Medium-Term Notes due January 2014	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	5.13%		5.13%		'
Weighted Average Interest Rate	5.13%		'		'
Weighted Average Years to Maturity	'		'1 day		'
Senior Unsecured Notes	184,000,000		184,000,000		184,000,000
5.50% Medium-Term Notes due April 2014	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	5.50%		5.50%		'
Unamortized discount	37,000		37,000		89,000
Weighted Average Interest Rate	5.50%		'		'
Weighted Average Years to Maturity	'		'3 months		'
Senior Unsecured Notes	128,480,000		128,480,000		128,411,000
5.25% Medium-Term Notes due January 2015	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	5.25%		5.25%		'
Unamortized discount	166,000		166,000		262,000
Weighted Average Interest Rate	5.25%		'		'
Weighted Average Years to Maturity	'		'1 year 0 months 14 days		'
Senior Unsecured Notes	325,041,000		325,041,000		324,913,000
5.25% Medium-Term Notes due January 2016	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	5.25%		5.25%		'
Weighted Average Interest Rate	5.25%		'		'
Weighted Average Years to Maturity	'		'2 years 0 months 14 days		'
Senior Unsecured Notes	83,260,000		83,260,000		83,260,000
2.90% Term Notes due January 2016	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	2.73%		2.73%		'
Weighted Average Interest Rate	2.73%		'		'
Weighted Average Years to Maturity	'		'4 years 5 months 4 days		'
Senior Unsecured Notes	250,000,000		250,000,000		250,000,000
8.50% Debentures due September 2024	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	8.50%		8.50%		'
Weighted Average Interest Rate	8.50%		'		'
Weighted Average Years to Maturity	'		'10 years 8 months 15 days		'
Senior Unsecured Notes	15,644,000		15,644,000		15,644,000
4.25% Medium-Term Notes due June 2018	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	4.25%		4.25%		'
Unamortized discount	2,001,000		2,001,000		2,322,000
Weighted Average Interest Rate	4.25%		'		'
Weighted Average Years to Maturity	'		'4 years 4 months 24 days		'
Senior Unsecured Notes	298,107,000		298,107,000		297,678,000
5.00% Medium-Term Notes due January 2012	'		'		'
Debt Instrument [Line Items]	'		'		'
Stated interest rate	'		'		5.00%
Other	'		'		'
Debt Instrument [Line Items]	'		'		'
Senior Unsecured Notes	$30,000		$30,000		$33,000
[1]	With the exception of the 1.42% Term Notes due June 2018 and revolving credit facility which carry a variable interest rate, all unsecured debt carries fixed interest rates.

Secured_Debt_and_Unsecured_Deb3

Secured Debt and Unsecured Debt (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Secured credit facilities	'	'
Borrowings outstanding	$838,100	'
Fannie Mae	'	'
Secured credit facilities	'	'
Borrowings outstanding	838,076	842,487
Weighted average daily borrowings during the period ended	839,597	903,817
Maximum daily borrowings during the period ended	$841,494	$1,054,735
Weighted average interest rate during the period ended	4.20%	4.30%
Weighted average interest rate at the end of the period	4.10%	4.40%

Secured_Debt_and_Unsecured_Deb4

Secured Debt and Unsecured Debt (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of short-term bank borrowings under unsecured commercial bank credit facility	'	'
Borrowings outstanding at end of period	$838,100	'
Unsecured Commercial Bank Credit Facility	'	'
Summary of short-term bank borrowings under unsecured commercial bank credit facility	'	'
Total revolving credit facility	900,000	900,000
Borrowings outstanding at end of period	0	76,000
Weighted average daily borrowings during the period ended	169,844	167,038
Maximum daily borrowings during the period ended	$372,000	$788,000
Weighted average interest rate during the period ended	1.20%	1.50%
Interest rate at the end of the period	1.30%	1.40%

Secured_Debt_and_Unsecured_Deb5

Secured Debt and Unsecured Debt (Details 3) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Aggregate maturities of debt	'		'
2013	$359,609		'
2014	521,592		'
2015	282,504		'
2016	243,398		'
2017	875,129		'
Thereafter	1,241,471		'
Total Debt	3,523,703		3,409,333
Secured Debt	'		'
Aggregate maturities of debt	'		'
2013	48,035		'
2014	197,210		'
2015	200,026		'
2016	243,398		'
2017	226,483		'
Thereafter	526,925		'
Total Debt	1,442,077		'
Secured Debt | Fixed Rate Debt	'		'
Aggregate maturities of debt	'		'
2013	48,035		'
2014	197,210		'
2015	136,431		'
2016	178,398		'
2017	176,483		'
Thereafter	335,816		'
Total Debt	1,072,373		'
Secured Debt | Variable Rate Debt	'		'
Aggregate maturities of debt	'		'
2013	0		'
2014	0		'
2015	63,595		'
2016	65,000		'
2017	50,000		'
Thereafter	191,109		'
Total Debt	369,704		'
Unsecured Debt	'		'
Aggregate maturities of debt	'		'
2013	311,574		'
2014	324,382		'
2015	82,478		'
2016	0		'
2017	648,646		'
Thereafter	714,546		'
Total Debt	$2,081,626	[1]	'
[1]	With the exception of the 1.42% Term Notes due June 2018 and revolving credit facility which carry a variable interest rate, all unsecured debt carries fixed interest rates.

Secured_Debt_and_Unsecured_Deb6

Secured Debt and Unsecured Debt (Details Textual) (USD $)

1 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

0 Months Ended

12 Months Ended

3 Months Ended

1 Months Ended

12 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

12 Months Ended

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2013

Dec. 31, 2013

Sep. 26, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2012

Mar. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Jun. 30, 2013

Dec. 31, 2013

Jun. 06, 2013

Dec. 31, 2012

Dec. 31, 2013

Jun. 06, 2013

Dec. 31, 2013

Jun. 06, 2013

Dec. 31, 2013

Dec. 31, 2013

Jun. 06, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

OneHundredMillionUnsecuredTermLoanDueJune2018 [Member]

OneHundredMillionUnsecuredTermLoanDueJune2018 [Member]

1.67% Term Notes due December 2016

1.67% Term Notes due December 2016

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Debt Assumed As Part of Acquisition [Member]

Debt Assumed As Part of Acquisition [Member]

Debt Assumed As Part of Acquisition [Member]

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Tax-exempt secured notes payable

Tax-exempt secured notes payable

4.63% Medium-Term Notes due January 2022

4.63% Medium-Term Notes due January 2022

2.68% Term Notes due December 2016

2.68% Term Notes due December 2016

TwoHundredFiftyMillionUnsecuredTermLoanDueJune2018 [Member]

TwoHundredFiftyMillionUnsecuredTermLoanDueJune2018 [Member]

ThreePointSevenTermNotesDueOctober2020 [Member]

ThreePointSevenTermNotesDueOctober2020 [Member]

ThreePointSevenTermNotesDueOctober2020 [Member]

ThreePointSevenTermNotesDueOctober2020 [Member]

Five Point One Three Percent, Medium Term Notes, Due January 2014 [Member]

Five Point One Three Percent, Medium Term Notes, Due January 2014 [Member]

Five Point One Three Percent, Medium Term Notes, Due January 2014 [Member]

UDR Bank Credit Facility

UDR Bank Credit Facility

UDR Bank Credit Facility

UDR Bank Credit Facility

Fannie Mae credit facility subject to refinancing [Member]

Fannie Mae credit facility subject to refinancing [Member]

Fannie Mae credit facility, Seven Year Fixed [Member]

Fannie Mae credit facility, Seven Year Fixed [Member]

Fannie Mae credit facility, Seven Year Fixed [Member]

Fannie Mae credit facility, Ten Year Variable [Member]

Fannie Mae credit facility, Ten Year Variable [Member]

Fannie Mae credit facility, Ten Year Variable [Member]

Beginning of range of initial term of debt [Member]

End of range of inital term of debt [Member]

End of range of inital term of debt [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fixed Rate Debt

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Variable Rate Debt

Variable Rate Debt

Fannie Mae [Member]

Fannie Mae [Member]

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Line of Credit [Member]

Mortgages [Member]

credit_facility

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Fannie Mae credit facilities

Fannie Mae credit facilities

Variable Rate Debt

Fixed Rate Debt

Secured Debt (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured debt amount which encumbers real estate owned based upon book value

'

$2,300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of secured debt which encumbers real estate owned based upon book value

'

28.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured debt amount of real estate owned which is unencumbered

'

5,900,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of secured debt of real estate owned which is unencumbered

'

71.80%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, maturity date range, start

'

'

'

'

'

'

'

'

'

'

'

'

1-Dec-14

'

'

'

'

'

'

1-May-17

'

'

'

1-Aug-19

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, maturity date range, end

'

'

'

'

'

'

'

'

'

'

'

'

1-May-19

'

'

'

'

'

'

1-Jul-23

'

'

'

20-Mar-32

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable minimum interest rates range

'

'

'

'

'

'

'

'

'

'

'

'

3.43%

'

'

'

'

'

'

'

'

'

'

'

0.79%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable maximum interest rates range

'

'

'

'

'

'

'

'

'

'

'

'

5.94%

'

'

'

'

'

'

'

'

'

'

'

0.95%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amortization of Debt Discount (Premium)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,100,000

4,900,000

3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unamortized fair market adjustment

'

11,800,000

16,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,972,000

'

'

'

'

'

'

54,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of secured credit facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facilities with aggregate commitment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

838,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

900,000,000

'

900,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

184,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured Debt Including Debt on Real Estate Held for Sale

'

'

'

1,072,373,000

1,086,611,000

369,704,000

343,524,000

'

'

'

'

445,706,000

445,706,000

455,533,000

63,595,000

37,415,000

'

'

'

'

631,078,000

211,409,000

211,409,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

211,409,000

626,667,000

Debt, Weighted Average Interest Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.99%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average interest rate

'

4.31%

'

5.18%

'

1.54%

'

'

'

1.42%

'

5.44%

'

'

2.34%

'

'

'

'

'

'

'

'

'

'

4.63%

'

2.50%

'

'

'

'

3.70%

'

'

'

5.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional time period for extending facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in maximum borrowing capacity of unsecured revolving credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,450,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.23%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Line of Credit

'

2,200,000

3,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed interest rate

'

'

'

'

'

'

'

'

'

1.42%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.63%

'

2.50%

'

'

'

'

3.70%

'

'

'

5.13%

'

'

'

'

'

'

'

3.95%

'

'

'

'

'

'

'

'

'

'

Interest rate at the end of the period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.30%

'

1.40%

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate at the end of the period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.61%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument Facility Fee, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.23%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date

'

'

'

'

'

'

'

30-Jun-18

'

'

1-Jun-18

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30-Jun-18

'

31-Oct-20

'

'

'

'

'

'

31-Dec-17

'

'

'

31-Dec-19

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of Debt Instrument Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

99.98%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Interest Rate Description

'110

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Commitment Fee Description

'20

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior Notes

'

250,000,000

'

'

'

'

'

'

100,000,000

35,000,000

35,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

397,118,000

396,759,000

65,000,000

65,000,000

'

'

'

299,946,000

'

0

'

184,000,000

184,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of refinanced credit facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$186,000,000

'

$90,000,000

'

'

$96,000,000

'

'

'

'

'

'

Debt Instrument, Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'7 years

'

'

'10 years

'7 years

'10 years

'10 years

'

'

Debt Instrument, Description of Variable Rate Basis

'

'

'

'

'

'

'

'125

'142.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'125

'142.5

'

'

'

'

'

'

'

'

'

'

'

'284

'

'

'

'

'190

'

'

'

'

'

'

'

IncomeLoss_Per_Share_Details

Income/(Loss) Per Share (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Per Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest

($3,374)

$2,351

$4,525

($1,162)

($13,972)

($9,287)

($23,961)

$915

$2,340

($46,305)

($126,869)

Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

48

2,089

4,937

Income (Loss) from Continuing Operations Attributable to Parent

'

'

'

'

'

'

'

'

2,448

-44,356

-122,099

Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest

'

'

'

'

'

'

'

'

60

-140

-167

Net Income (Loss) Attributable to Redeemable Noncontrolling Interest

'

'

'

'

'

'

'

'

1,530

7,986

395

Net (loss)/income attributable to common stockholders

35,769

2,257

4,261

-1,199

-13,231

-9,962

145,721

80,848

41,088

203,376

10,537

Net income/(loss)

'

'

'

'

'

'

'

'

46,282

220,303

20,585

Premium on preferred stock redemption or repurchases, net

'

'

'

'

'

'

'

'

0

-2,791

-175

udr_IncomeLossContinuingOperationsAvailableToCommonShareholders

'

'

'

'

'

'

'

'

-1,276

-53,157

-131,585

Income/(loss) from discontinued operations, net of tax

41,376

884

829

853

1,016

-389

180,268

85,713

43,942

266,608

147,454

Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

-1,578

-10,075

-5,332

Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent

'

'

'

'

'

'

'

'

42,364

256,533

142,122

Weighted Average Number of Shares Issued, Basic

'

'

'

'

'

'

'

'

250,684

239,482

202,573

Dilutive Securities, Effect on Basic Earnings Per Share, Options and Restrictive Stock Units

'

'

'

'

'

'

'

'

-715

-631

-1,279

Weighted Average Number of Shares Outstanding, Basic and Diluted

'

'

'

'

'

'

'

'

249,969

238,851

201,294

Income (Loss) from Continuing Operations, Per Basic and Diluted Share

'

'

'

'

'

'

'

'

($0.01)

($0.22)

($0.65)

Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share

'

'

'

'

'

'

'

'

$0.17

$1.07

$0.71

Net income/(loss) attributable to common stockholders b basic and diluted (in dollars per share)

$0.14

[1]

$0.01

[1]

$0.02

[1]

($0.00)

[1]

($0.05)

[1]

($0.04)

[1]

$0.62

[1]

$0.37

[1]

$0.16

$0.85

$0.05

Noncontrolling Interest

'

'

'

'

'

'

'

'

'

'

'

Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest

'

'

'

'

'

'

'

'

60

-140

-167

Series G Preferred Stock [Member]

'

'

'

'

'

'

'

'

'

'

'

Dividends, Preferred Stock

'

'

'

'

'

'

'

'

0

-2,286

-5,587

Series E Preferred Stock [Member]

'

'

'

'

'

'

'

'

'

'

'

Dividends, Preferred Stock

'

'

'

'

'

'

'

'

($3,724)

($3,724)

($3,724)

[1]

Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.

IncomeLoss_Per_Share_IncomeLos2

Income/(Loss) Per Share Income/(Loss) Per Share (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'
Weighted Average Number Diluted Shares Outstanding Adjustment	0	'	'
OP Units	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	9,337,464	9,411,415	7,602,000
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	3,035,548	3,035,548	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	1,583,537	1,361,398	2,153,739

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2008

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

31-May-12

31-May-07

Dec. 31, 2013

Series E Preferred Stock [Member]

Series E Preferred Stock [Member]

Series E Preferred Stock [Member]

Series F Preferred Stock

Series F Preferred Stock

Series F Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

6.75% Series G Cumulative Redeemable Preferred Stock

Restricted Stock [Member]

Class of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized

350,000,000

350,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares authorized

50,000,000

50,000,000

'

'

'

'

'

20,000,000

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period Net of Forfeitures

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

577,316

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

604,477

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

27,161

Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership, Shares

76,291

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common distributions declared per share

$0.94

$0.88

$0.80

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage distribution for not subject to domestic Federal income tax

0.9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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

'

'

'

'

$0

$0.57

$1.69

'

'

'

Preferred stock, shares outstanding

'

'

'

'

2,803,812

2,803,812

'

2,464,183

'

2,529,194

0

0

0

'

'

'

'

Preferred stock, par or state value per share

$0

$0

'

'

'

'

'

$0.00

'

'

'

'

'

'

'

'

'

Preferred stock, value, issued

'

'

'

'

'

'

'

$246

$253

'

'

'

'

'

'

'

'

Preferred stock, shares issued

'

'

'

'

2,803,812

2,803,812

'

'

'

'

0

0

0

'

'

5,400,000

'

Preferred stock, dividend rate

'

'

'

'

'

'

'

'

'

'

'

6.75%

'

'

'

'

'

Preferred stock, redemption price per share

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$25

'

'

Stock stock, redemption amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

82,100,000

'

'

Preferred stock, shares redeemed

'

'

'

'

'

'

'

'

'

'

3,264,362

3,264,362

141,200

'

'

'

'

Preferred stock, redemption discount

'

'

'

'

'

'

'

'

'

'

'

$2,791,000

($175,000)

'

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Options Outstanding, Number of Options	'	'
Balance, December 31, 2011	2,430,127,000	'
Granted	0	'
Exercised	0	'
Balance, December 31, 2012	2,430,127,000	'
Options Outstanding, Weighted Average Exercise Price	'	'
Balance, December 31, 2011 (in dollars per share)	$12.63	'
Granted (in dollars per share)	$0	'
Exercised (in dollars per share)	$0	'
Forfeited (in dollars per share)	$0	'
Balance, December 31, 2012 (in dollars per share)	$12.63	'
Options Exercisable, Number of Options	'	'
Number of Options	2,430,127,000	2,430,127,000
Options Exercisable, Weighted Average Exercise Price	'	'
Weighted Average Exercise Price (in dollars per share)	$12.63	$12.63
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	$3,400,000	'
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	328,223	'
Granted	604,477	'
Vested	-146,794	'
Forfeited	-27,161	'
Balance, December 31, 2012	758,745	'
Restricted Stock, Weighted Average Fair Value Per Restricted Stock	'	'
Balance, December 31, 2011 (in dollars per share)	$23.35	'
Granted (in dollars per share)	$23.71	'
Vested (in dollars per share)	$21.95	'
Forfeited (in dollars per share)	$23.91	'
Balance, December 31, 2012 (in dollars per share)	$23.89	'

Employee_Benefit_Plans_Details1

Employee Benefit Plans (Details Textual) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2009

Dec. 30, 2008

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Range One

Range Two

Range Three

Stock Options

Stock Options

Stock Options

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Restricted Stock

Long Term Incentive Plan

Long Term Incentive Plan

Long Term Incentive Plan

Long Term Incentive Plan

Long Term Incentive Plan

Long Term Incentive Plan

Profit Sharing Plan

Profit Sharing Plan

Profit Sharing Plan

Minimum

Maximum

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Issued

3,632,305

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number

2,430,127,000

2,430,127,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares reserved for issuance under plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16,000,000

4,000,000

'

'

'

Expiration period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

Shares available for issuance under plan

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,928,182

'

'

'

'

'

Total remaining compensation cost related to unvested share options

'

'

'

'

'

$0

'

'

$3,400,000

'

'

'

'

$5,300,000

'

'

'

'

'

'

'

'

Weighted average remaining contractual life

'

'

'

'

'

'

'

'

'1 year 6 months

'

'

'

'

'2 years

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value

'

'

'

'

'

'

'

'

$23.71

'

'

'

'

$21.97

'

'

'

'

'

'

'

'

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

15.80%

'

'

'

'

'

'

'

'

Weighted average remaining contractual life on all options outstanding

'4 years 4 months 24 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of share options exercisable

2,430,127,000

2,430,127,000

1,994,957

404,291

30,879

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share options exercise price, lower range limit

'

'

$10.06

$24.38

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share options exercise price, upper range limit

'

'

'

'

$25.10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock based compensation expense

'

'

'

'

'

0

100,000

1,100,000

3,600,000

3,700,000

4,200,000

'

'

5,900,000

4,900,000

4,500,000

'

'

'

'

'

'

Vesting period

'

'

'

'

'

'

'

'

'

'

'

'3 years

'4 years

'

'

'

'

'

'

'

'

'

Aggregate provisions for contributions

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$900,000

$600,000

$700,000

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Taxable Distributions Paid Per Common Share [Abstract]	'	'	'
Ordinary income	$0.74	$0.17	$0.49
Long-term capital gain	$0.11	$0.19	$0.07
Unrecapture section 1250 gain	$0.07	$0.52	$0.21
Taxable distributions per common share	$0.93	$0.88	$0.77

Income_Taxes_Details_1

Income Taxes (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current	'	'	'
Federal	($1,030)	$1,961	$463
State	846	1,463	552
Total current	-184	3,424	1,015
Deferred	'	'	'
Federal	-6,907	-21,479	6,646
State	-1,190	-3,021	-90
Total deferred	-8,097	-24,500	6,556
Total income tax expense/(benefit)	-8,281	-21,076	7,571
Continuing Operations [Member]	'	'	'
Deferred	'	'	'
Total income tax expense/(benefit)	-7,299	-30,282	-5,647
Tax Benefit of Taxable Subsidiary	'	-30,717	'
Discontinued Operations [Member]	'	'	'
Deferred	'	'	'
Total income tax expense/(benefit)	($982)	$9,641	$13,218

Income_Taxes_Details_2

Income Taxes (Details 2) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Deferred tax assets:	'	'	'
Federal and state tax attributes	$13,069	$1,464	$24,524
Book/tax depreciation	19,354	12,345	10,045
Construction capitalization differences	0	6,635	5,948
Investment in partnerships	0	3,112	3,618
Debt and interest deductions	10,311	0	0
Other	0	2,009	999
Total deferred tax assets	42,734	25,565	45,134
Valuation allowance	-1,310	-1,390	-45,134
Net deferred tax assets	41,424	24,175	0
Deferred tax liabilities:	'	'	'
Other	-305	0	0
Total deferred tax liabilities	-9,151	0	0
Net deferred tax asset	$32,273	$24,175	$0

Income_Taxes_Details_3

Income Taxes (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income tax expense/(benefit)	'	'	'
U.S. federal income tax expense/(benefit)	($8,493)	$21,853	$11,715
State income tax provision	46	2,497	2,099
Other items	246	-1,682	1,227
Valuation allowance	-80	-43,744	-7,470
Total income tax expense/(benefit)	($8,281)	($21,076)	$7,571

Income_Taxes_Details_Textual

Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]	'	'	'
U.S. statutory rate	35.00%	35.00%	35.00%
Valuation allowance	$1,310,000	$1,390,000	$45,134,000
Change in valuation allowance of deferred tax assets	-100,000	-44,394,000	'
Unrecognized Tax Benefits	0	'	'
Internal Revenue Service (IRS)	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Net loss carryforwards	25,900,000	'	'
2020 through 2030 | State	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Net loss carryforwards	$61,200,000	'	'

Noncontrolling_Interests_Detai

Noncontrolling Interests (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Apartment_Homes								Apartment_Homes
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Net (loss)/income attributable to common stockholders	$35,769,000	$2,257,000	$4,261,000	($1,199,000)	($13,231,000)	($9,962,000)	$145,721,000	$80,848,000	$41,088,000	$203,376,000	$10,537,000
Acquisition of non-controlling interest	'	'	'	'	'	'	'	'	'	-4,871,000	-450,000
Number of Apartment Homes Acquired	0	'	'	'	'	'	'	'	0	'	'
Change in equity from net loss income attributable to common stockholders and conversion of operating partnership units to companys common stock	'	'	'	'	'	'	'	'	42,905,000	203,905,000	10,824,000
Redeemable noncontrolling interests in the Operating Partnership	'	'	'	'	'	'	'	'	'	'	'
Beginning redeemable non-controlling interests in the Operating Partnership	'	'	'	223,418,000	'	'	'	236,475,000	223,418,000	236,475,000	'
Mark to market adjustment to redeemable non-controlling interests in the Operating Partnership	'	'	'	'	'	'	'	'	3,656,000	-11,392,000	13,978,000
Adjustment for conversion of non-controlling interest of unitholders in Operating Partnership	'	'	'	'	'	'	'	'	-1,817,000	-529,000	-287,000
Net income attributable to redeemable non-controlling interests in the Operating Partnership	'	'	'	'	'	'	'	'	1,530,000	7,986,000	395,000
Distributions to redeemable non-controlling interests in the Operating Partnership	'	'	'	'	'	'	'	'	-9,440,000	-9,202,000	'
Ending redeemable non-controlling interests in the Operating Partnership	217,597,000	'	'	'	223,418,000	'	'	'	217,597,000	223,418,000	236,475,000
Net income attributable to non-controlling interests	'	'	'	'	'	'	'	'	-60,000	140,000	167,000
Noncontrolling Interest	'	'	'	'	'	'	'	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Acquisition of non-controlling interest	'	'	'	'	'	'	'	'	'	-4,871,000	'
Redeemable noncontrolling interests in the Operating Partnership	'	'	'	'	'	'	'	'	'	'	'
Net income attributable to non-controlling interests	'	'	'	'	'	'	'	'	-60,000	140,000	167,000
Operating Community [Member] | Noncontrolling Interest	'	'	'	'	'	'	'	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Acquisition of non-controlling interest	'	'	'	'	'	'	'	'	'	-4,000,000	'
Number of Apartment Homes Acquired	'	'	'	'	'	'	'	'	'	434	'
Development Community [Member] | Noncontrolling Interest	'	'	'	'	'	'	'	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Acquisition of non-controlling interest	'	'	'	'	'	'	'	'	'	-900,000	'
RedeemableNoncontrollingInterest [Member]	'	'	'	'	'	'	'	'	'	'	'
Redeemable noncontrolling interests in the Operating Partnership	'	'	'	'	'	'	'	'	'	'	'
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	$250,000	$80,000	($404,000)
Corporate Joint Venture [Member]	'	'	'	'	'	'	'	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Number of Communities Acquired	'	'	'	'	'	'	'	'	'	2	'
Operating Community [Member]	'	'	'	'	'	'	'	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Number of Communities Acquired	'	'	'	'	'	'	'	'	'	1	'

Fair_Value_of_Derivatives_and_4

Fair Value of Derivatives and Financial Instruments (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Derivative Asset Designated as Hedging Instrument, Fair Value	$0		$2
Derivatives - Interest rate contracts	4,965		11,022
Unsecured debt instruments	'		'
Redeemable non-controlling interests in operating partnership	217,597		223,418
Carrying Amount | Fair Value, Measurements, Recurring	'		'
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Notes receivable	83,033		'
Total assets	83,033		64,008
Unsecured debt instruments	'		'
Total liabilities	3,528,668		3,420,355
Redeemable non-controlling interests in operating partnership	217,597	[1]	223,418	[1]
Carrying Amount | Interest rate contracts | Fair Value, Measurements, Recurring	'		'
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Derivatives - Interest rate contracts	4,965		11,022	[2]
Carrying Amount | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	445,706	[2]	455,533	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	63,595	[2]	37,415	[3]
Carrying Amount | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	94,700	[2]	94,700	[3]
Carrying Amount | Fannie Mae credit facilities | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	626,667	[2]	631,078	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	211,409	[2]	211,409	[3]
Carrying Amount | Commercial bank | Fair Value, Measurements, Recurring	'		'
Unsecured debt instruments	'		'
Unsecured debt instruments	'		76,000	[3]
Carrying Amount | Senior unsecured notes | Fair Value, Measurements, Recurring	'		'
Unsecured debt instruments	'		'
Unsecured debt instruments	2,081,626	[3]	1,903,198	[3]
Carrying Amount | 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	'		2	[1]
Fair Value | Fair Value, Measurements, Recurring	'		'
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Notes receivable	83,833		'
Total assets	83,833		64,932
Unsecured debt instruments	'		'
Total liabilities	3,651,141		3,654,305
Redeemable non-controlling interests in operating partnership	217,597	[1]	223,418	[1]
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	'		2	[1]
Derivatives - Interest rate contracts	4,965	[1]	11,022	[2]
Fair Value | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	466,375	[2]	494,728	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	63,595	[2]	37,415	[3]
Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	94,700	[2]	94,700	[3]
Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	661,094	[2]	689,295	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	211,409	[2]	211,409	[3]
Fair Value | Commercial bank | Fair Value, Measurements, Recurring	'		'
Unsecured debt instruments	'		'
Unsecured debt instruments	'		76,000	[3]
Fair Value | Senior unsecured notes | Fair Value, Measurements, Recurring	'		'
Unsecured debt instruments	'		'
Unsecured debt instruments	2,149,003	[3]	2,039,736	[3]
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		'
Total assets	0		0
Unsecured debt instruments	'		'
Total liabilities	0		0
Redeemable non-controlling interests in operating 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
Derivatives - Interest rate contracts	0		0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage notes payable | 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
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		'
Total assets	0		2
Unsecured debt instruments	'		'
Total liabilities	4,965		11,022
Redeemable non-controlling interests in operating partnership	217,597	[1]	223,418	[1]
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	'		2
Derivatives - Interest rate contracts	4,965		'
Fair Value | Significant Other Observable Inputs (Level 2) | Mortgage notes payable | 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
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	83,833		'
Total assets	83,833		64,930
Unsecured debt instruments	'		'
Total liabilities	3,646,176		3,643,283
Redeemable non-controlling interests in operating 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
Derivatives - Interest rate contracts	0		0
Fair Value | Significant Unobservable Inputs (Level 3) | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	466,375		494,728
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	63,595		37,415
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	661,094		689,295
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	211,409		211,409
Fair Value | Significant Unobservable Inputs (Level 3) | Commercial bank | Fair Value, Measurements, Recurring	'		'
Unsecured debt instruments	'		'
Unsecured debt instruments	'		76,000
Fair Value | Significant Unobservable Inputs (Level 3) | Senior unsecured notes | Fair Value, Measurements, Recurring	'		'
Unsecured debt instruments	'		'
Unsecured debt instruments	$2,149,003		$2,039,736
[1]	See Note 6, Secured Debt and Unsecured Debt.
[2]	See Note 2, Significant Accounting Policies.
[3]	See Note 13, Derivatives and Hedging Activity.

Derivatives_and_Hedging_Activi4

Derivatives and Hedging Activity (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	instruments
Designated as Hedging Instrument | Interest rate swaps	'
Derivative [Line Items]	'
Number of Instruments	11
Derivative, Notional Amount	$419,787
Designated as Hedging Instrument | Interest rate caps	'
Derivative [Line Items]	'
Number of Instruments	5
Derivative, Notional Amount	274,291
Not Designated as Hedging Instrument | Interest rate caps	'
Derivative [Line Items]	'
Number of Instruments	2
Derivative, Notional Amount	$155,197

Derivatives_and_Hedging_Activi5

Derivatives and Hedging Activity (Details 1) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair value of Company's derivative financial instruments and their classification on Consolidated Balance Sheet	'	'
Derivative Asset Designated as Hedging Instrument, Fair Value	$0	$2
Derivative Liability Designated as Hedging Instrument, Fair Value	4,965	11,022
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	0	2
Derivative Liability Designated as Hedging Instrument, Fair Value	4,965	11,022
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	0	0
Derivative Liability Not Designated as Hedging Instrument, Fair Value	0	0
Interest rate products | 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	0	2
Interest rate products | 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	0	0
Interest rate products | 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	4,965	11,022
Interest rate products | 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_Activi6

Derivatives and Hedging Activity (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effect of derivative instruments on the Consolidated Statements of Operations	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	($6,851,000)	($7,649,000)	($9,132,000)
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	-469,000	-4,924,000	-16,477,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	-6,851,000	-7,649,000	-9,132,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	0	0	-58,000
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	-469,000	-4,924,000	-16,477,000
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	-6,851,000	-7,649,000	-9,132,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net, Total	0	0	-58,000
Interest rate products | Other income/(expense)	'	'	'
Effect of derivative instruments on the Consolidated Statements of Operations	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	$271,000	$290,000	($23,000)

Derivatives_and_Hedging_Activi7

Derivatives and Hedging Activity Derivatives and Hedging Activity (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Derivative Liability Designated as Hedging Instrument, Fair Value	$4,965	$11,022
Derivative Liability, Not Subject to Master Netting Arrangement	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,965	11,022
Derivative Liability	4,965	11,022
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	2
Derivative Asset, Not Subject to Master Netting Arrangement	0	0
Derivative Asset	0	2
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	$0	$2

Derivatives_and_Hedging_Activi8

Derivatives and Hedging Activity (Details Textual) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
			Cash Flow Hedging	Cash Flow Hedging	Cash Flow Hedging
Derivative [Line Items]	'	'	'	'	'
Derivative, Collateral, Obligation to Return Cash	$0	$0	'	'	'
Derivatives And Hedging Activity (Textual) [Abstract]	'	'	'	'	'
Cash flow hedge ineffectiveness in earnings materiality	'less than a B $1,000	'	'	'	'
Reclassified loss from Other Comprehensive Income/(Loss) to earnings	'	'	0	0	58,000
Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense	4,400,000	'	'	'	'
Fair value of derivatives in a net liability position	5,500,000	'	'	'	'
Payment required to pay for contract termination	$5,500,000	'	'	'	'

Commitments_and_Contingencies_3

Commitments and Contingencies (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Long-term Purchase Commitment [Line Items]	'
Costs Incurred to Date	$776,685
Expected Costs to Complete	477,094	[1]
Wholly-owned b under development	'
Long-term Purchase Commitment [Line Items]	'
Number of Properties	6
Costs Incurred to Date	467,413
Purchase Commitment, Remaining Minimum Amount Committed	230,137
Average Ownership Stake	100.00%
Wholly-owned b redevelopment	'
Long-term Purchase Commitment [Line Items]	'
Number of Properties	2
Costs Incurred to Date	134,261
Purchase Commitment, Remaining Minimum Amount Committed	39,039
Average Ownership Stake	100.00%
Unconsolidated joint ventures	'
Long-term Purchase Commitment [Line Items]	'
Number of Properties	2
Costs Incurred to Date	160,738
Purchase Commitment, Remaining Minimum Amount Committed	130,182
Average Ownership Stake	51.00%
Participating Loan Investment Steele Creek Denver Colorado [Member]	'
Long-term Purchase Commitment [Line Items]	'
Number of Properties	1
Costs Incurred to Date	14,273
Purchase Commitment, Remaining Minimum Amount Committed	$77,736
Average Ownership Stake	0.00%
[1]	Costs incurred to date include $41.8 million and $7.7 million of accrued fixed assets for development and redevelopment, respectively.

Commitments_and_Contingencies_4

Commitments and Contingencies (Details 1) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Ground Leases	'
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'
2013	$5,270	[1]
2014	5,270	[1]
2015	5,270	[1]
2016	5,270	[1]
2017	5,270	[1]
Thereafter	314,501	[1]
Total	340,851	[1]
Office Space	'
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]	'
2013	691
2014	633
2015	47
2016	0
2017	0
Thereafter	0
Total	$1,371
[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_Contingencies_5

Commitments and Contingencies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Communities
Ground Leases	'	'	'
Real Estate Properties [Line Items]	'	'	'
Number of Real Estate Properties	6	'	'
Rent expense	$5,200,000	$5,100,000	$4,900,000
Office Space	'	'	'
Real Estate Properties [Line Items]	'	'	'
Rent expense	1,300,000	1,100,000	1,200,000
Wholly-owned b under development	'	'	'
Real Estate Properties [Line Items]	'	'	'
Capital Expenditures Incurred but Not yet Paid	$41,800,000	'	'
Number of Real Estate Properties	6	'	'

Reportable_Segments_Details

Reportable Segments (Details) (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2009

Segments

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Number of reportable segments

'

'

'

'

'

'

'

'

2

'

'

'

Condition for Community considered to have stabilized occupancy

'

'

'

'

'

'

'

'

'90% occupancy for at least three consecutive months

'

'

'

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

'

'

'

'

'

'

'

'

$758,926,000

$716,612,000

$623,357,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

514,041,000

504,200,000

484,760,000

'

Joint Venture Managment and Other Fees

'

'

'

'

'

'

'

'

12,442,000

11,911,000

9,668,000

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Property management

'

'

'

'

'

'

'

'

-20,780,000

-20,465,000

-20,101,000

'

Other operating expenses

'

'

'

'

'

'

'

'

-7,136,000

-5,718,000

-6,118,000

'

Depreciation and amortization

'

'

'

'

'

'

'

'

-341,490,000

-350,401,000

-370,343,000

'

Hurricane-related charges, net

'

'

'

'

'

'

'

'

'

'

0

'

General and administrative

'

'

'

'

'

'

'

'

-42,238,000

-43,792,000

-47,257,000

'

Insurance Recoveries

'

'

'

'

'

'

'

'

12,253,000

-8,495,000

0

'

Other depreciation and amortization

'

'

'

'

'

'

'

'

-6,741,000

-4,105,000

-3,931,000

'

Loss from unconsolidated entities

'

'

'

'

'

'

'

'

-415,000

-8,579,000

-6,352,000

'

Interest Expense

'

'

'

'

'

'

'

'

-126,083,000

-138,792,000

-156,366,000

'

Interest and Other Income Including Discontinued Operations

'

'

'

'

'

'

'

'

4,681,000

2,703,000

5,688,000

'

Tax benefit/(expense) of taxable REIT subsidiary, net

'

'

'

'

'

'

'

'

7,299,000

30,282,000

5,647,000

'

Redeemable non-controlling interests in OP

'

'

'

'

'

'

'

'

-1,530,000

-7,986,000

-395,000

'

Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable

'

'

'

'

'

'

'

'

-60,000

140,000

167,000

'

Net (loss)/gain on sale of depreciable property

'

'

'

'

'

'

'

'

40,449,000

251,554,000

125,290,000

'

Net (loss)/income attributable to Entity

'

'

'

'

'

'

'

'

44,812,000

212,177,000

20,023,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

8,207,977,000

'

'

'

8,055,828,000

'

'

'

8,207,977,000

8,055,828,000

'

'

Accumulated depreciation

-2,208,794,000

'

'

'

-1,924,682,000

'

'

'

-2,208,794,000

-1,924,682,000

'

'

Total real estate owned, net of accumulated depreciation

5,999,183,000

'

'

'

6,131,146,000

'

'

'

5,999,183,000

6,131,146,000

'

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

30,249,000

'

'

'

12,115,000

'

'

'

30,249,000

12,115,000

12,503,000

9,486,000

Restricted cash

22,796,000

'

'

'

23,561,000

'

'

'

22,796,000

23,561,000

'

'

Deferred financing costs, net

26,924,000

'

'

'

24,990,000

'

'

'

26,924,000

24,990,000

'

'

Notes receivable

83,033,000

'

'

'

64,006,000

'

'

'

83,033,000

64,006,000

'

'

Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount

507,655,000

'

'

'

477,631,000

'

'

'

507,655,000

477,631,000

'

'

Other assets

137,882,000

'

'

'

125,654,000

'

'

'

137,882,000

125,654,000

'

'

Total assets

6,807,722,000

'

'

'

6,859,103,000

'

'

'

6,807,722,000

6,859,103,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

452,057,000

422,480,000

189,711,000

'

Same Communities

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

50,400,000

48,400,000

43,100,000

'

Same Communities Western Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

232,374,000

219,988,000

204,570,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

165,657,000

154,496,000

141,797,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

2,323,850,000

'

'

'

2,325,934,000

'

'

'

2,323,850,000

2,325,934,000

'

'

Same Communities Mid-Atlantic Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

166,518,000

161,991,000

152,833,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

115,805,000

112,699,000

105,213,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

1,431,590,000

'

'

'

1,419,873,000

'

'

'

1,431,590,000

1,419,873,000

'

'

Same Communities Southeastern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

116,192,000

110,461,000

105,004,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

75,825,000

71,218,000

66,202,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

889,753,000

'

'

'

887,483,000

'

'

'

889,753,000

887,483,000

'

'

Same Communities Southwestern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

40,576,000

38,099,000

35,266,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

24,869,000

22,817,000

20,319,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

350,158,000

'

'

'

346,449,000

'

'

'

350,158,000

346,449,000

'

'

Same Communities Northeast Region [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

58,073,000

54,460,000

37,553,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

42,353,000

39,376,000

27,181,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

738,805,000

'

'

'

723,437,000

'

'

'

738,805,000

723,437,000

'

'

Non-Mature communities/Other

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

141,903,000

159,245,000

195,732,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

89,532,000

103,594,000

124,048,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

2,473,821,000

'

'

'

2,352,652,000

'

'

'

2,473,821,000

2,352,652,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

5,400,000

6,700,000

14,700,000

'

Total Communities [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

755,636,000

744,244,000

730,958,000

'

Minimum

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Percent occupancy to be considered a community

'

'

'

'

'

'

'

'

90.00%

'

'

'

Time to maintain percent occupancy to be considered a community

'

'

'

'

'

'

'

'

'3 months

'

'

'

United Dominion Reality L.P.

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Related party management fee percentage

'

'

'

'

'

'

'

'

2.75%

'

'

'

Number of reportable segments

'

'

'

'

'

'

'

'

2

'

'

'

Condition for Community considered to have stabilized occupancy

'

'

'

'

'

'

'

'

'once it achieves 90% occupancy for at least three consecutive months

'

'

'

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

'

'

'

'

'

'

'

'

410,842,000

400,691,000

387,057,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

287,535,000

281,538,000

264,258,000

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Property management

'

'

'

'

'

'

'

'

-11,298,000

-11,019,000

-10,644,000

'

Other operating expenses

'

'

'

'

'

'

'

'

-5,728,000

-5,272,000

-5,484,000

'

Depreciation and amortization

'

'

'

'

'

'

'

'

-181,302,000

-195,051,000

-197,964,000

'

Interest

'

'

'

'

'

'

'

'

-36,058,000

-45,234,000

-53,632,000

'

General and administrative

'

'

'

'

'

'

'

'

-24,808,000

-26,204,000

-26,370,000

'

Insurance Recoveries

'

'

'

'

'

'

'

'

-8,083,000

5,518,000

0

'

Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Nonredeemable

'

'

'

'

'

'

'

'

4,566,000

352,000

70,000

'

Net (loss)/gain on sale of depreciable property

'

'

'

'

'

'

'

'

41,518,000

51,094,000

60,065,000

'

Net (loss)/income attributable to Entity

44,482,000

11,011,000

10,154,000

7,729,000

-349,000

85,000

51,172,000

-6,926,000

73,376,000

43,982,000

30,159,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

4,188,480,000

'

'

'

4,182,920,000

'

'

'

4,188,480,000

4,182,920,000

'

'

Accumulated depreciation

-1,241,574,000

'

'

'

-1,097,133,000

'

'

'

-1,241,574,000

-1,097,133,000

'

'

Total real estate owned, net of accumulated depreciation

2,946,906,000

'

'

'

3,085,787,000

'

'

'

2,946,906,000

3,085,787,000

'

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

1,897,000

'

'

'

2,804,000

'

'

'

1,897,000

2,804,000

704,000

920,000

Restricted cash

13,526,000

'

'

'

12,926,000

'

'

'

13,526,000

12,926,000

'

'

Deferred financing costs, net

5,848,000

'

'

'

6,072,000

'

'

'

5,848,000

6,072,000

'

'

Other assets

25,064,000

'

'

'

28,665,000

'

'

'

25,064,000

28,665,000

'

'

Total assets

2,993,241,000

'

'

'

3,136,254,000

'

'

'

2,993,241,000

3,136,254,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

151,002,000

115,355,000

63,191,000

'

United Dominion Reality L.P. | Same Communities

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

25,900,000

27,200,000

'

'

United Dominion Reality L.P. | Same Communities Western Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

175,384,000

166,181,000

156,587,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

125,956,000

117,744,000

109,672,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

1,664,314,000

'

'

'

1,651,316,000

'

'

'

1,664,314,000

1,651,316,000

'

'

United Dominion Reality L.P. | Same Communities Mid-Atlantic Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

68,205,000

66,487,000

64,020,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

46,770,000

45,801,000

44,400,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

706,447,000

'

'

'

701,741,000

'

'

'

706,447,000

701,741,000

'

'

United Dominion Reality L.P. | Same Communities Southeastern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

43,208,000

40,771,000

38,606,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

28,105,000

26,510,000

24,212,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

328,150,000

'

'

'

322,882,000

'

'

'

328,150,000

322,882,000

'

'

United Dominion Reality L.P. | Same Communities Southwestern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

21,105,000

19,859,000

18,286,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

13,293,000

12,225,000

10,994,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

186,934,000

'

'

'

185,501,000

'

'

'

186,934,000

185,501,000

'

'

United Dominion Reality L.P. | Same Communities Northeast Region [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

443,483,000

'

'

'

434,138,000

'

'

'

443,483,000

434,138,000

'

'

United Dominion Reality L.P. | Non-Mature communities/Other

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

66,317,000

72,814,000

85,150,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

46,262,000

53,605,000

57,151,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

859,152,000

'

'

'

887,342,000

'

'

'

859,152,000

887,342,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

$1,900,000

$2,700,000

'

'

United Dominion Reality L.P. | Minimum

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Percent occupancy to be considered a community

'

'

'

'

'

'

'

'

90.00%

'

'

'

Time to maintain percent occupancy to be considered a community

'

'

'

'

'

'

'

'

'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 $)

12 Months Ended

3 Months Ended

12 Months Ended

4 Months Ended

12 Months Ended

4 Months Ended

12 Months Ended

4 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Apr. 30, 2013

Dec. 31, 2013

Apr. 30, 2013

Dec. 31, 2013

Apr. 30, 2013

New York Properties [Member]

New York Properties [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

Business Interruption [Member]

Business Interruption [Member]

FY 2012 [Member]

FY 2012 [Member]

FY 2013 [Member]

FY 2013 [Member]

Apartment_Homes

Casualty Gain [Member]

Rent concessions

Rent not contractually receivable

New York Properties [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

United Dominion Reality L.P.

Business Interruption [Member]

Business Interruption [Member]

Business Interruption [Member]

Business Interruption [Member]

Communities

Casualty Gain [Member]

Rent concessions

Rent not contractually receivable

Hurricane Sandy [Member]

Hurricane Sandy [Member]

United Dominion Reality L.P.

Hurricane Sandy [Member]

United Dominion Reality L.P.

Apartment_Homes

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Related Charges [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Communities Owned

'

'

'

'

3

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

Number of Apartments Owned

'

'

'

'

1,706

'

'

'

'

'

'

'

'

1,001

'

'

'

'

'

'

'

'

'

'

'

'

Impairment of Long-Lived Assets Held-for-use

'

'

'

$0

$9,000,000

'

'

'

'

'

'

'

'

'

$7,100,000

$0

'

'

'

'

'

'

'

'

'

'

Other Cost and Expense, Operating

7,136,000

5,718,000

6,118,000

'

10,400,000

'

'

'

'

'

5,728,000

5,272,000

5,484,000

'

7,000,000

'

'

'

'

'

'

'

'

'

'

'

Total Estimated Insurance Recovery

'

'

'

'

'

14,500,000

'

'

'

'

'

'

'

'

'

'

10,800,000

'

'

'

'

'

'

'

'

'

Proceeds from Insurance Settlement, Investing Activities

2,600,000

4,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,800,000

4,200,000

4,200,000

2,100,000

2,600,000

2,100,000

Insurance Recoveries

12,253,000

-8,495,000

0

'

'

4,800,000

'

654,000

'

'

-8,083,000

5,518,000

0

'

'

3,300,000

'

582,000

'

'

'

'

'

'

'

'

Other Nonrecurring Expense

'

'

'

'

'

$3,400,000

$4,400,000

'

$3,600,000

$767,000

'

'

'

'

'

$2,100,000

$2,200,000

'

$1,800,000

$400,000

'

'

'

'

'

'

Unaudited_Summarized_Consolida4

Unaudited Summarized Consolidated Quarterly Financial Data Unaudited Summarized Consolidated Quarterly Financial Data (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]	'		'		'		'		'		'		'		'		'	'	'
Rental income	$190,321	[1]	$187,917	[1]	$186,285	[1]	$181,961	[1]	$180,150	[1]	$179,448	[1]	$175,153	[1]	$169,950	[1]	'	'	'
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	-3,374		2,351		4,525		-1,162		-13,972		-9,287		-23,961		915		2,340	-46,305	-126,869
Income/(loss) from discontinued operations, net of tax	41,376		884		829		853		1,016		-389		180,268		85,713		43,942	266,608	147,454
Net (loss)/income attributable to stakeholders	$35,769		$2,257		$4,261		($1,199)		($13,231)		($9,962)		$145,721		$80,848		$41,088	$203,376	$10,537
Earnings per weighted average common share - basic and diluted:	'		'		'		'		'		'		'		'		'	'	'
Net (loss)/income attributable to common stockholders b basic and diluted (in dollars per share)	$0.14	[2]	$0.01	[2]	$0.02	[2]	($0.00)	[2]	($0.05)	[2]	($0.04)	[2]	$0.62	[2]	$0.37	[2]	$0.16	$0.85	$0.05
[1]	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
[2]	Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.

Consolidation_and_Basis_of_Pre3

Consolidation and Basis of Presentation (UNITED DOMINION REALTY, L.P.) (Details)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2009

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Apartment_Homes

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

UDR, Inc.

UDR, Inc.

Non-affiliated Partners

Non-affiliated Partners

Class A Limited Partner

Class A Limited Partner

Class A Limited Partner

Class A Limited Partner

Communities

Markets

United Dominion Reality L.P.

United Dominion Reality L.P.

Markets

Communities

Apartment_Homes

Consolidation and Basis of Presentation [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rental revenues percent of General Partner's consolidated rental revenues

'

'

'

'

54.00%

54.00%

53.00%

'

'

'

'

'

'

'

'

Number of communities owned

141

'

'

'

68

'

'

'

'

'

'

'

'

'

'

Number of markets operating within

21

'

'

'

17

'

'

'

'

'

'

'

'

'

'

Number of apartments owned

41,250

'

'

'

20,746

'

'

'

'

'

'

'

'

'

'

Operating Partnership outstanding units

183,278,698

184,281,253

'

'

'

'

'

'

'

'

'

'

'

'

'

OP units outstanding related to general partner

173,959,774

174,886,035

'

'

110,883

110,883

'

'

'

'

'

'

'

'

'

Percentage of total outstanding Operating Partnership units represented by General Partnership units outstanding

'

'

'

'

0.06%

'

'

'

'

'

'

'

'

'

'

Percentage of units owned by UDR

94.90%

94.90%

'

'

'

'

'

'

'

'

'

'

'

'

'

OP units outstanding related to limited partner

183,278,698

184,281,254

184,281,254

179,909,409

183,167,815

184,170,370

'

173,848,891

174,775,152

9,318,924

9,395,218

1,751,671

1,751,671

1,751,671

1,751,671

Percentage of units outstanding owned by limited partners

'

'

'

'

'

'

'

94.90%

94.90%

5.10%

5.10%

'

'

'

'

Significant_Accounting_Policie6

Significant Accounting Policies (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Line Items]	'	'	'
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company	'	'	0.1
Net intangible assets	$9,000,000	$11,900,000	'
Net intangible liabilities	4,400,000	5,200,000	'
Development costs excluding direct costs and capitalized interest	11,100,000	10,000,000	10,000,000
Interest capitalized during period	29,400,000	26,400,000	13,000,000
Advertising expense	5,700,000	6,200,000	5,400,000
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]	'	'	'
Cumulative Adjustment to Net Income Attributable to Noncontrolling Interest	3,300,000	'	'
Minimum Percentage of Carrying Value Of Real Estate Portfolio Held By Company	'	'	0.1
Net intangible assets	7,600,000	9,300,000	'
Net intangible liabilities	3,500,000	3,900,000	'
Development costs excluding direct costs and capitalized interest	2,500,000	2,100,000	2,200,000
Interest capitalized during period	5,900,000	3,700,000	1,800,000
Advertising expense	$2,500,000	$2,400,000	$2,500,000
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	'	'

Real_Estate_Owned_UNITED_DOMIN2

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
In Thousands, unless otherwise specified
Summary of carrying amounts for real estate owned (at cost)	'	'	'	'
Land	$1,847,127	$1,884,403	'	'
Held for sale:	'	'	'	'
Sold or held for sale	10,800	'	'	'
Under development:	'	'	'	'
Under development	466,002	489,795	'	'
Real estate owned	8,207,977	8,055,828	'	'
Accumulated depreciation	-2,208,794	-1,924,682	-1,831,727	-1,638,326
Total real estate owned, net of accumulated depreciation	5,999,183	6,131,146	'	'
Land	'	'	'	'
Held for sale:	'	'	'	'
Sold or held for sale	10,751	22,766	'	'
Under development:	'	'	'	'
Under development	110,769	151,154	'	'
Building and improvements	'	'	'	'
Held for sale:	'	'	'	'
Sold or held for sale	5,969	66,243	'	'
Construction in progress	'	'	'	'
Under development:	'	'	'	'
Under development	356,644	339,894	'	'
United Dominion Reality L.P.	'	'	'	'
Summary of carrying amounts for real estate owned (at cost)	'	'	'	'
Land	1,004,447	994,709	'	'
Depreciable property - held and used:	'	'	'	'
Building and improvements	3,103,970	3,030,883	'	'
Under development:	'	'	'	'
Under development	80,063	86,260	'	'
Real estate owned	4,188,480	4,182,920	'	'
Accumulated depreciation	-1,241,574	-1,097,133	-976,358	-884,083
Total real estate owned, net of accumulated depreciation	2,946,906	3,085,787	'	'
United Dominion Reality L.P. | Land	'	'	'	'
Held for sale:	'	'	'	'
Sold or held for sale	0	12,015	'	'
Under development:	'	'	'	'
Under development	9,447	25,833	'	'
United Dominion Reality L.P. | Building and improvements	'	'	'	'
Held for sale:	'	'	'	'
Sold or held for sale	0	57,921	'	'
United Dominion Reality L.P. | Construction in progress	'	'	'	'
Under development:	'	'	'	'
Under development	$70,616	$61,559	'	'

Real_Estate_Owned_UNITED_DOMIN3

Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)

3 Months Ended

12 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Apartment_Homes

Apartment_Homes

Communities

Communities

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

New York Properties [Member]

New York Properties [Member]

New York Properties [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Communities

Communities

Apartment_Homes

Apartment_Homes

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

States

States

Communities

Apartment_Homes

States

Communities

Real Estate Owned (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of communities owned

141

141

'

'

68

'

'

'

'

'

'

'

'

'

Number of states operating within

10

10

'

'

9

'

'

'

'

'

'

'

'

'

Number of apartments owned

41,250

41,250

'

'

20,746

'

'

'

'

'

'

'

'

'

Number of communities acquired apartment homes are within

'

0

0

0

'

'

'

'

'

'

'

'

'

'

Number of apartment homes acquired

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Number of Communities Owned

'

'

'

'

'

'

'

'

3

2

'

'

'

'

Number of Apartments Owned

'

'

'

'

'

'

'

'

1,706

1,001

'

'

'

'

Development costs excluding direct costs and capitalized interest

'

$11,100,000

$10,000,000

$10,000,000

$2,500,000

$2,100,000

$2,200,000

'

'

'

'

'

'

'

Capitalized Interest Costs, Including Allowance for Funds Used During Construction

'

29,400,000

26,400,000

13,000,000

5,900,000

3,700,000

1,800,000

'

'

'

'

'

'

'

Impairment of Long-Lived Assets Held-for-use

'

'

'

'

'

'

'

0

9,000,000

'

'

7,100,000

0

'

Other Cost and Expense, Operating

'

7,136,000

5,718,000

6,118,000

5,728,000

5,272,000

5,484,000

'

10,400,000

'

'

7,000,000

'

'

Total Estimated Insurance Recovery

'

'

'

'

'

'

'

'

'

'

$14,500,000

'

'

$10,800,000

Discontinued_Operations_UNITED2

Discontinued Operations (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Communities								Communities	Apartment_Homes
										Communities
Discontinued Operations (Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Number of communities sold	'	'	'	'	'	'	'	'	'	6	'
Number of apartment homes sold	'	'	'	'	'	'	'	'	'	1,418	'
Proceeds from Sale of Property, Plant, and Equipment	'	'	'	'	'	'	'	'	$81,100,000	$609,400,000	$593,400,000
Number of communities held for sale	1	'	'	'	'	'	'	'	1	'	'
Summary of income from discontinued operations	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	9,152,000	39,543,000	117,269,000
Rental expenses	'	'	'	'	'	'	'	'	3,511,000	14,106,000	44,100,000
Property management fee	'	'	'	'	'	'	'	'	252,000	1,087,000	3,226,000
Real estate depreciation	'	'	'	'	'	'	'	'	1,958,000	8,475,000	45,713,000
Interest	'	'	'	'	'	'	'	'	-62,000	821,000	2,066,000
Income before net gain on the sale of property	'	'	'	'	'	'	'	'	3,493,000	15,054,000	22,164,000
Net (loss)/gain on the sale of depreciable property	'	'	'	'	'	'	'	'	41,919,000	260,404,000	138,508,000
(Loss)/income from discontinued operations	41,376,000	884,000	829,000	853,000	1,016,000	-389,000	180,268,000	85,713,000	43,942,000	266,608,000	147,454,000
United Dominion Reality L.P.	'	'	'	'	'	'	'	'	'	'	'
Discontinued Operations (Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Number of communities sold	'	'	'	'	'	'	4	'	2	'	8
Number of apartment homes sold	'	'	'	'	'	'	'	'	914	1,314	2,024
Proceeds from Sale of Property, Plant, and Equipment	'	'	'	'	'	'	'	'	81,100,000	'	'
Number of communities held for sale	0	'	'	'	'	'	'	'	0	'	'
Summary of income from discontinued operations	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	8,989,000	15,745,000	42,120,000
Rental expenses	'	'	'	'	'	'	'	'	3,149,000	5,444,000	15,734,000
Property management fee	'	'	'	'	'	'	'	'	247,000	432,000	1,160,000
Real estate depreciation	'	'	'	'	'	'	'	'	1,935,000	3,320,000	13,503,000
Interest	'	'	'	'	'	'	'	'	0	0	815,000
Income before net gain on the sale of property	'	'	'	'	'	'	'	'	3,658,000	6,549,000	10,908,000
Net (loss)/gain on the sale of depreciable property	'	'	'	'	'	'	'	'	41,518,000	51,094,000	60,065,000
(Loss)/income from discontinued operations	$42,407,000	$982,000	$882,000	$905,000	$945,000	$656,000	$54,243,000	$1,799,000	$45,176,000	$57,643,000	$70,973,000
United Dominion Reality L.P. | United Dominion Reality L.P.	'	'	'	'	'	'	'	'	'	'	'
Discontinued Operations (Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Number of communities sold	'	'	'	'	'	'	4	'	'	'	'
United Dominion Reality L.P. | United Dominion Reality L.P.	'	'	'	'	'	'	'	'	'	'	'
Discontinued Operations (Textual) [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Number of apartment homes sold	'	'	'	'	'	'	'	'	'	984	'

Debt_UNITED_DOMINION_REALTY_LP2

Debt (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
		Communities
Debt Instrument [Line Items]	'	'	'
Weighted Average Interest Rate	4.31%	'	'
Weighted Average Years to Maturity	'	'4 years 4 months 26 days	'
Fixed Rate Debt	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	$1,072,373	$1,072,373	$1,086,611
Weighted Average Interest Rate	5.18%	'	'
Weighted Average Years to Maturity	'	'3 years 11 months 12 days	'
Number of Communities Encumbered	'	30	'
Fixed Rate Debt | Mortgage notes payable	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	445,706	445,706	455,533
Weighted Average Interest Rate	5.44%	'	'
Weighted Average Years to Maturity	'	'2 years 6 months	'
Number of Communities Encumbered	8	'	'
Fixed Rate Debt | Fannie Mae credit facilities	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	'	'	631,078
Debt, Weighted Average Interest Rate	4.99%	4.99%	'
Weighted Average Years to Maturity	'	'5 years	'
Number of Communities Encumbered	22	'	'
Variable Rate Debt	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	369,704	369,704	343,524
Weighted Average Interest Rate	1.54%	'	'
Weighted Average Years to Maturity	'	'6 years 6 months 12 days	'
Number of Communities Encumbered	'	11	'
Variable Rate Debt | Mortgage notes payable	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	63,595	63,595	37,415
Weighted Average Interest Rate	2.34%	'	'
Weighted Average Years to Maturity	'	'2 years 1 month 6 days	'
Number of Communities Encumbered	2	'	'
Variable Rate Debt | Tax-exempt secured notes payable	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	94,700	94,700	94,700
Weighted Average Interest Rate	0.84%	'	'
Weighted Average Years to Maturity	'	'9 years 2 months 12 days	'
Number of Communities Encumbered	2	'	'
Variable Rate Debt | Fannie Mae credit facilities	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	211,409	211,409	211,409
Debt Instrument, Interest Rate at Period End	1.61%	1.61%	'
Weighted Average Years to Maturity	'	'6 years 6 months	'
Number of Communities Encumbered	7	'	'
United Dominion Reality L.P.	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	934,865	934,865	967,239
Weighted Average Interest Rate	'	4.47%	'
Weighted Average Years to Maturity	'	'4 years 11 months 21 days	'
Number of Communities Encumbered	'	21	'
United Dominion Reality L.P. | Fannie Mae credit facilities	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	521,100	521,100	'
United Dominion Reality L.P. | Fixed Rate Debt	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	765,806	765,806	765,637
Weighted Average Interest Rate	'	5.08%	'
Weighted Average Years to Maturity	'	'4 years 0 months 12 days	'
Number of Communities Encumbered	'	15	'
United Dominion Reality L.P. | Fixed Rate Debt | Mortgage notes payable	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	386,803	386,803	394,999
Weighted Average Interest Rate	'	5.44%	'
Weighted Average Years to Maturity	'	'2 years 6 months 18 days	'
Number of Communities Encumbered	'	5	'
United Dominion Reality L.P. | Fixed Rate Debt | Fannie Mae credit facilities	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt, Weighted Average Interest Rate	4.71%	4.71%	'
Weighted Average Years to Maturity	'	'5 years 5 months 26 days	'
Number of Communities Encumbered	'	10	'
United Dominion Reality L.P. | Variable Rate Debt	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	169,059	169,059	201,602
Weighted Average Interest Rate	'	1.75%	'
Weighted Average Years to Maturity	'	'9 years 4 months 26 days	'
Number of Communities Encumbered	'	6	'
United Dominion Reality L.P. | Variable Rate Debt | Mortgage notes payable	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	0	0	37,415
Debt Instrument, Interest Rate at Period End	0.00%	0.00%	'
Weighted Average Years to Maturity	'	'0 years	'
Number of Communities Encumbered	'	0	'
United Dominion Reality L.P. | Variable Rate Debt | Tax-exempt secured notes payable	'	'	'
Debt Instrument [Line Items]	'	'	'
Principal outstanding	$27,000	$27,000	$27,000
Debt Instrument, Interest Rate at Period End	0.95%	0.95%	'
Weighted Average Years to Maturity	'	'18 years 2 months 19 days	'
Number of Communities Encumbered	'	1	'
United Dominion Reality L.P. | Variable Rate Debt | Fannie Mae credit facilities	'	'	'
Debt Instrument [Line Items]	'	'	'
Debt, Weighted Average Interest Rate	1.90%	1.90%	'
Weighted Average Years to Maturity	'	'7 years 8 months 19 days	'
Number of Communities Encumbered	'	5	'

Debt_UNITED_DOMINION_REALTY_LP3

Debt (UNITED DOMINION REALTY, L.P.) (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]	'	'
Borrowings outstanding	$838,100	'
Fannie Mae	'	'
Debt Instrument [Line Items]	'	'
Borrowings outstanding	838,076	842,487
Weighted average daily borrowings during the period ended	839,597	903,817
Maximum daily borrowings during the period ended	841,494	1,054,735
Weighted average interest rate during the period ended	4.20%	4.30%
Interest rate at the end of the period	4.10%	4.40%
United Dominion Reality L.P. | Fannie Mae	'	'
Debt Instrument [Line Items]	'	'
Borrowings outstanding	521,062	507,825
Weighted average daily borrowings during the period ended	522,007	544,793
Maximum daily borrowings during the period ended	$523,187	$635,762
Weighted average interest rate during the period ended	'	4.30%
Interest rate at the end of the period	'	4.40%

Debt_UNITED_DOMINION_REALTY_LP4

Debt (UNITED DOMINION REALTY, L.P.) (Details 2) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
2013	$359,609	'
2014	521,592	'
2015	282,504	'
2016	243,398	'
2017	875,129	'
Thereafter	1,241,471	'
Total	1,442,077	1,430,135
United Dominion Reality L.P.	'	'
Debt Instrument [Line Items]	'	'
2013	8,934	'
2014	193,303	'
2015	132,339	'
2016	23,891	'
2017	209,722	'
Thereafter	366,676	'
Total	934,865	967,239
United Dominion Reality L.P. | Mortgage notes payable | Fixed Rate Debt	'	'
Debt Instrument [Line Items]	'	'
2013	8,590	'
2014	192,939	'
2015	131,957	'
2016	1,641	'
2017	1,696	'
Thereafter	49,980	'
Total	386,803	'
United Dominion Reality L.P. | Fannie Mae credit facilities | Fixed Rate Debt	'	'
Debt Instrument [Line Items]	'	'
2013	344	'
2014	364	'
2015	382	'
2016	15,684	'
2017	161,754	'
Thereafter	200,475	'
Total	379,003	'
United Dominion Reality L.P. | Fannie Mae credit facilities | Variable Rate Debt	'	'
Debt Instrument [Line Items]	'	'
2013	0	'
2014	0	'
2015	0	'
2016	6,566	'
2017	46,272	'
Thereafter	89,221	'
Total	142,059	'
United Dominion Reality L.P. | Tax-exempt secured notes payable | Variable Rate Debt	'	'
Debt Instrument [Line Items]	'	'
2013	0	'
2014	0	'
2015	0	'
2016	0	'
2017	0	'
Thereafter	27,000	'
Total	$27,000	'

Debt_UNITED_DOMINION_REALTY_LP5

Debt (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)

12 Months Ended

1 Months Ended

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jun. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Sep. 26, 2013

Dec. 31, 2013

Sep. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

UDR Bank Credit Facility

UDR Bank Credit Facility

UDR Bank Credit Facility

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Tax-exempt secured notes payable

Tax-exempt secured notes payable

Unsecured Revolving Credit Facility due October 2015

Unsecured Revolving Credit Facility due October 2015

ThreePointSevenTermNotesDueOctober2020 [Member]

ThreePointSevenTermNotesDueOctober2020 [Member]

ThreePointSevenTermNotesDueOctober2020 [Member]

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

Beginning of range of initial term of debt [Member]

End of range of inital term of debt [Member]

End of range of inital term of debt [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Line of Credit [Member]

Mortgages [Member]

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Variable Rate Debt

Variable Rate Debt

UDR Bank Credit Facility

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Mortgages [Member]

Tax-exempt secured notes payable

Tax-exempt secured notes payable

2.90% Term Notes due January 2016

2.90% Term Notes due January 2016

1.68% Term Notes due December 2016

Five Point Two Five Percent, Medium Term Notes, Due January 2016 [Member]

4.25% Medium-Term Notes due June 2018

4.25% Medium-Term Notes due June 2018

4.63% Medium-Term Notes due January 2022

4.63% Medium-Term Notes due January 2022

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Reported Value Measurement [Member]

Financial Guarantee

Fixed Rate Debt

Variable Rate Debt

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Variable Rate Debt

Variable Rate Debt

Financial Guarantee

Financial Guarantee

Financial Guarantee

Financial Guarantee

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fannie Mae credit facilities

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

Fannie Mae credit facilities

Variable Rate Debt

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Fannie Mae credit facilities

Fixed Rate Debt

Fixed Rate Debt

Fixed Rate Debt

Variable Rate Debt

Variable Rate Debt

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total revolving credit facility

'

'

'

'

$900,000,000

$900,000,000

'

'

'

'

$838,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Borrowings outstanding

838,100,000

'

'

'

0

76,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

76,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Term

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'7 years

'10 years

'10 years

'

'

'

'

'

'

Secured Debt Including Debt on Real Estate Held for Sale

'

'

'

'

'

'

1,072,373,000

1,086,611,000

369,704,000

343,524,000

'

631,078,000

211,409,000

211,409,000

445,706,000

455,533,000

63,595,000

37,415,000

94,700,000

94,700,000

'

'

'

'

'

934,865,000

967,239,000

'

765,806,000

765,637,000

169,059,000

201,602,000

521,100,000

'

'

386,803,000

394,999,000

0

37,415,000

27,000,000

27,000,000

'

'

'

'

'

'

'

'

'

'

'

211,409,000

379,003,000

370,638,000

142,059,000

137,187,000

626,667,000

Debt, Weighted Average Interest Rate

'

'

'

'

'

'

'

'

'

'

4.99%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.71%

1.90%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate at Period End

'

'

'

'

'

'

'

'

'

'

'

'

1.61%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.00%

'

0.95%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reallocation of Credit Facilities Debt from General Partner

13,682,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unamortized fair market adjustment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10,000,000

13,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date Range, Start

'

'

'

'

'

'

'

'

'

'

1-May-17

'

'

'

1-Dec-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1-May-17

'

31-Dec-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date Range, End

'

'

'

'

'

'

'

'

'

'

1-Jul-23

'

'

'

1-May-19

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Jul-23

'

1-May-19

'

'

'

20-Mar-32

'

6-Jun-18

'

'

6-Jun-18

1-Jun-18

'

1-Jan-22

'

'

'

'

'

'

'

'

'

'

Notes payable minimum interest rates range

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.43%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.43%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notes payable maximum interest rates range

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.94%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.94%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Guarantor borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

900,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

250,000,000

100,000,000

'

'

300,000,000

'

400,000,000

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$300,000,000

$300,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Maturity Date

'

'

'

31-Dec-17

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Oct-20

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related_Party_Transactions_UNI1

Related Party Transactions (UNITED DOMINION REALTY, L.P.) (Details) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jan. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

Receivable Due From General Partner [Member]

Taxable REIT Subsidiaries

Taxable REIT Subsidiaries

UDR, Inc.

UDR, Inc.

UDR, Inc.

UDR, Inc.

UDR, Inc.

UDR, Inc.

UDR, Inc.

UDR, Inc.

United Dominion Reality L.P.

Bottom Dollar guaranty

Bottom Dollar guaranty

Bottom Dollar guaranty

Guaranty related to community acquisition

Guaranty related to community acquisition

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net receivable balances from General Partner

'

'

'

$9,916,000

'

$11,056,000

($9,916,000)

($11,056,000)

'

'

'

'

'

'

'

'

'

General and administrative expenses allocated to the Operating Partnership by UDR

'

'

'

'

'

'

'

'

23,500,000

25,200,000

32,600,000

'

'

'

'

'

'

Related party management fee percentage

'

'

'

2.75%

'

'

2.75%

'

'

'

'

'

'

'

'

'

'

Related party management fees

12,300,000

11,900,000

3,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Related party guaranty note payable interest rate

'

'

'

'

'

'

'

'

'

'

'

5.18%

0.93%

'

'

5.34%

'

Notes payable due to General Partner

'

'

'

88,696,000

'

88,696,000

'

'

'

'

'

'

83,200,000

83,300,000

5,500,000

5,500,000

'

Number of OP Units issued as consideration for acquisition guaranteed by related party note payable (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,802,239

'

'

Limited Partners' Capital Account, Units Redeemed

1,002,556

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

OP Units issued for real estate

$0

$0

($111,034,000)

$77,041,000

($111,034,000)

'

'

'

'

'

'

'

'

'

'

'

$53,712,000

Fair_Value_of_Derivatives_and_5

Fair Value of Derivatives and Financial Instruments (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
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		$2
Derivatives - Interest rate contracts	4,965		11,022
Fair Value | Fair Value, Measurements, Recurring	'		'
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Total assets	83,833		64,932
Secured debt instruments - variable rate	'		'
Total liabilities	3,651,141		3,654,305
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	'		2	[1]
Derivatives - Interest rate contracts	4,965	[1]	11,022	[2]
Fair Value | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	466,375	[2]	494,728	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	63,595	[2]	37,415	[3]
Fair Value | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	94,700	[2]	94,700	[3]
Fair Value | Fannie Mae credit facilities | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	661,094	[2]	689,295	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	211,409	[2]	211,409	[3]
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
Derivatives - Interest rate contracts	0		0
Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage notes payable | 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	0		2
Secured debt instruments - variable rate	'		'
Total liabilities	4,965		11,022
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	'		2
Derivatives - Interest rate contracts	4,965		'
Fair Value | Significant Other Observable Inputs (Level 2) | Mortgage notes payable | 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	83,833		64,930
Secured debt instruments - variable rate	'		'
Total liabilities	3,646,176		3,643,283
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
Derivatives - Interest rate contracts	0		0
Fair Value | Significant Unobservable Inputs (Level 3) | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	466,375		494,728
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	63,595		37,415
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	661,094		689,295
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	211,409		211,409
Carrying Amount | Fair Value, Measurements, Recurring	'		'
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Total assets	83,033		64,008
Secured debt instruments - variable rate	'		'
Total liabilities	3,528,668		3,420,355
Carrying Amount | Interest rate contracts | Fair Value, Measurements, Recurring	'		'
Estimated fair values of the financial instruments either recorded or disclosed on a recurring basis	'		'
Derivatives - Interest rate contracts	4,965		11,022	[2]
Carrying Amount | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	445,706	[2]	455,533	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	63,595	[2]	37,415	[3]
Carrying Amount | Tax-exempt secured notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	94,700	[2]	94,700	[3]
Carrying Amount | Fannie Mae credit facilities | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	626,667	[2]	631,078	[3]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	211,409	[2]	211,409	[3]
Carrying Amount | 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	'		2	[1]
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	0		2
Derivatives - Interest rate contracts	2,731		4,750
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	'		2
Secured debt instruments - variable rate	'		'
Total liabilities	969,724		1,035,714
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	'		2	[4]
Derivatives - Interest rate contracts	2,731	[4]	4,750	[4]
United Dominion Reality L.P. | Fair Value | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	403,695	[5]	429,973	[5]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	'		37,415	[5]
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	[5]	27,000	[5]
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	394,239	[5]	399,389	[5]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	142,059	[5]	137,187	[5]
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
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
Derivatives - Interest rate contracts	0		0
United Dominion Reality L.P. | Fair Value | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Mortgage notes payable | 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
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	'		2
Secured debt instruments - variable rate	'		'
Total liabilities	2,731		4,750
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	'		2
Derivatives - Interest rate contracts	2,731		4,750
United Dominion Reality L.P. | Fair Value | Significant Other Observable Inputs (Level 2) | Mortgage notes payable | 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
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
Secured debt instruments - variable rate	'		'
Total liabilities	966,993		1,030,964
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
Derivatives - Interest rate contracts	0		0
United Dominion Reality L.P. | Fair Value | Significant Unobservable Inputs (Level 3) | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	403,695		429,973
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	'		37,415
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	394,239		399,389
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	142,059		137,187
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	'		2
Secured debt instruments - variable rate	'		'
Total liabilities	937,596		971,989
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	'		2	[4]
Derivatives - Interest rate contracts	2,731	[4]	4,750	[4]
United Dominion Reality L.P. | Carrying Amount | Mortgage notes payable | Fair Value, Measurements, Recurring	'		'
Secured debt instruments - fixed rate	'		'
Secured debt instruments - fixed rate	386,803	[5]	394,999	[5]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	'		37,415	[5]
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	[5]	27,000	[5]
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	379,003	[5]	370,638	[5]
Secured debt instruments - variable rate	'		'
Secured debt instruments - variable rate	$142,059	[5]	$137,187	[5]
[1]	See Note 6, Secured Debt and Unsecured Debt.
[2]	See Note 2, Significant Accounting Policies.
[3]	See Note 13, Derivatives and Hedging Activity.
[4]	See Note 8, Derivatives and Hedging Activity
[5]	See Note 5, Debt

Derivatives_and_Hedging_Activi9

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	instruments
Designated as Hedging Instrument | Interest rate swaps	'
Derivative [Line Items]	'
Number of Instruments	11
Derivative, Notional Amount	$419,787
Designated as Hedging Instrument | Interest rate caps	'
Derivative [Line Items]	'
Number of Instruments	5
Derivative, Notional Amount	274,291
Not Designated as Hedging Instrument | Interest rate caps	'
Derivative [Line Items]	'
Number of Instruments	2
Derivative, Notional Amount	155,197
United Dominion Reality L.P. | Designated as Hedging Instrument | Interest rate swaps	'
Derivative [Line Items]	'
Number of Instruments	2
Derivative, Notional Amount	96,974
United Dominion Reality L.P. | Designated as Hedging Instrument | Interest rate caps	'
Derivative [Line Items]	'
Number of Instruments	5
Derivative, Notional Amount	255,561
United Dominion Reality L.P. | Not Designated as Hedging Instrument | Interest rate caps	'
Derivative [Line Items]	'
Number of Instruments	1
Derivative, Notional Amount	$83,289

Recovered_Sheet1

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 1) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]	'	'
Derivative Asset Designated as Hedging Instrument, Fair Value	$0	$2
Derivative Liability Designated as Hedging Instrument, Fair Value	4,965	11,022
Designated as Hedging Instrument	'	'
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]	'	'
Derivative Asset Designated as Hedging Instrument, Fair Value	0	2
Derivative Liability Designated as Hedging Instrument, Fair Value	4,965	11,022
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	0	0
Derivative Liability Not Designated as Hedging Instrument, Fair Value	0	0
Interest rate products | Other assets | Designated as Hedging Instrument	'	'
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]	'	'
Derivative Asset Designated as Hedging Instrument, Fair Value	0	2
Interest rate products | Other assets | 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	0	0
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	4,965	11,022
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	0	2
Derivative Liability Designated as Hedging Instrument, Fair Value	2,731	4,750
United Dominion Reality L.P. | Designated as Hedging Instrument	'	'
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]	'	'
Derivative Asset Designated as Hedging Instrument, Fair Value	0	2
Derivative Liability Designated as Hedging Instrument, Fair Value	2,731	4,750
United Dominion Reality L.P. | 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	0	0
Derivative Liability Not Designated as Hedging Instrument, Fair Value	0	0
United Dominion Reality L.P. | Interest rate products | Other assets | Designated as Hedging Instrument	'	'
Derivative Assets (Liabilities), at Fair Value, Net, by Balance Sheet Classification [Abstract]	'	'
Derivative Asset Designated as Hedging Instrument, Fair Value	0	2
United Dominion Reality L.P. | Interest rate products | Other assets | 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	0	0
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	2,731	4,750
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

Recovered_Sheet2

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	$6,851,000	$7,649,000	$9,132,000
Cash Flow Hedging	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total	-469,000	-4,924,000	-16,477,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	6,851,000	7,649,000	9,132,000
Interest rate products | Cash Flow Hedging	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total	-469,000	-4,924,000	-16,477,000
Interest rate products | Other Income Expense [Member]	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	271,000	290,000	-23,000
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	6,851,000	7,649,000	9,132,000
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	2,652,000	3,431,000	4,719,000
United Dominion Reality L.P. | Cash Flow Hedging	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net, Total	-348,000	-1,898,000	-6,119,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	-2,652,000	-3,431,000	-4,719,000
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	-9,000	-9,000	-204,000
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	-9,000	-9,000	-204,000
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	-348,000	-1,898,000	-6,119,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	($2,652,000)	($3,431,000)	($4,719,000)

Recovered_Sheet3

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 3) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Derivative, Collateral, Obligation to Return Securities	$0	$0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	2
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	2
Derivative Asset, Not Subject to Master Netting Arrangement	0	0
Derivative Asset	0	2
United Dominion Reality L P [Member]	'	'
Derivative [Line Items]	'	'
Derivative, Collateral, Obligation to Return Securities	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	2
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	2
Derivative Asset, Not Subject to Master Netting Arrangement	0	0
Derivative Asset	$0	$2

Recovered_Sheet4

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details 4) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Derivative Liability	$4,965	$11,022
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	4,965	11,022
Derivative Liability Designated as Hedging Instrument, Fair Value	4,965	11,022
Derivative Liability, Not Subject to Master Netting Arrangement	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
United Dominion Reality L P [Member]	'	'
Derivative [Line Items]	'	'
Derivative Liability	2,731	4,750
Derivative, Collateral, Right to Reclaim Securities	0	0
Derivative Liability, Fair Value, Amount Offset Against Collateral	2,731	4,750
Derivative Liability Designated as Hedging Instrument, Fair Value	2,731	4,750
Derivative Liability, Not Subject to Master Netting Arrangement	0	0
Derivative, Collateral, Right to Reclaim Cash	$0	$0

Recovered_Sheet5

Derivatives and Hedging Activity (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)

3 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Maximum

Maximum

United Dominion Reality L.P.

United Dominion Reality L.P.

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Other Income Expense [Member]

Other Income Expense [Member]

Other Income Expense [Member]

Other Income Expense [Member]

Other Income Expense [Member]

Other Income Expense [Member]

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

Entity Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Derivative, Collateral, Obligation to Return Cash

$0

$0

'

'

$0

$0

'

'

'

'

'

'

Cash flow hedge ineffectiveness in earnings

'

'

1,000

1,000

'

'

'

'

'

'

'

'

Cash flow hedge ineffectiveness in earnings materiality

'less than a B $1,000

'

'

'

'less than $1,000

'

'

'

'

'

'

'

Estimated additional accumulated other comprehensive Income/(Loss) transferred to interest expense

4,400,000

'

'

'

2,200,000

'

'

'

'

'

'

'

Losses in the fair value of derivatives not designated in hedging relationships

'

'

'

'

'

'

-271,000

-290,000

23,000

9,000

9,000

204,000

Fair value of derivatives in a net liability position

5,500,000

'

'

'

2,900,000

'

'

'

'

'

'

'

Payment required to pay for contract termination

$5,500,000

'

'

'

$2,900,000

'

'

'

'

'

'

'

Capital_Structure_UNITED_DOMIN2

Capital Structure (UNITED DOMINION REALTY, L.P.) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	-1,002,556	'	'	'
Partners' Capital Account, Units, Acquisitions	'	0	'	'
Balance	184,281,254	184,281,254	'	179,909,409
Partners' Capital Account, Units, Redeemed	0	0	0	'
OP Units issued for acquisitions of real estate	'	'	4,371,845	'
Balance	183,278,698	184,281,254	184,281,254	179,909,409
UDR, Inc.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Balance	173,848,891	174,775,152	'	'
Class A Limited Partner	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Balance	1,751,671	1,751,671	'	'
Limited Partner	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	0	'	'	'
Partners' Capital Account, Units, Acquisitions	'	-5,646	'	'
Balance	7,643,548	7,669,632	'	3,310,298
Partners' Capital Account, Units, Redeemed	-76,295	-20,438	-12,511	'
OP Units issued for acquisitions of real estate	'	'	4,371,845	'
Balance	7,567,253	7,643,548	7,669,632	3,310,298
Limited Partner | UDR, Inc.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	1,002,556	'	'	'
Partners' Capital Account, Units, Acquisitions	'	5,646	'	'
Balance	174,775,152	174,749,068	'	174,736,557
Partners' Capital Account, Units, Redeemed	76,295	20,438	12,511	'
OP Units issued for acquisitions of real estate	'	'	0	'
Balance	173,848,891	174,775,152	174,749,068	174,736,557
Limited Partner | Class A Limited Partner	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	0	'	'	'
Partners' Capital Account, Units, Acquisitions	'	0	'	'
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	1,751,671
General Partner | UDR, Inc.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	0	'	'	'
Partners' Capital Account, Units, Acquisitions	'	0	'	'
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	110,883

Capital_Structure_UNITED_DOMIN3

Capital Structure (UNITED DOMINION REALTY, L.P.) (Details Textual) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	-1,002,556	'	'	'
General Partnership units outstanding	173,959,774	174,886,035	'	'
Limited partnership units owned	183,278,698	184,281,254	184,281,254	179,909,409
Redeemable non-controlling interests in operating partnership	$217,597	$223,418	'	'
OP Units issued for real estate	0	0	-111,034	'
United Dominion Reality L.P.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
General Partnership units outstanding	110,883	110,883	'	'
Limited partnership units owned	183,167,815	184,170,370	'	'
Required period to be outstanding before unit is redeemable	'1 year	'	'	'
Redeemable non-controlling interests in operating partnership	217,597	223,418	'	'
OP Units issued for real estate	77,041	'	-111,034	'
UDR, Inc.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
General Partnership units outstanding	'	'	'	'
Limited partnership units owned	173,848,891	174,775,152	'	'
Percentage of units	94.90%	94.90%	'	'
Non-affiliated Partners	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited partnership units owned	9,318,924	9,395,218	'	'
Percentage of units	5.10%	5.10%	'	'
Class A Limited Partner	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited partnership units owned	1,751,671	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	1,751,671	1,751,671	'	'
Limited Partner	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	0	'	'	'
Limited partnership units owned	7,567,253	7,643,548	7,669,632	3,310,298
Limited Partner | United Dominion Reality L.P.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
OP Units issued for real estate	'	'	0	'
Limited Partner | UDR, Inc.	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	1,002,556	'	'	'
Limited partnership units owned	173,848,891	174,775,152	174,749,068	174,736,557
Limited Partner | Class A Limited Partner	'	'	'	'
Limited Partners' Capital Account [Line Items]	'	'	'	'
Limited Partners' Capital Account, Units Redeemed	0	'	'	'
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	$23,329	'	($111,034)	'

Commitments_and_Contingencies_6

Commitments and Contingencies (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
	Communities
Real Estate Properties [Line Items]	'		'	'
Costs Incurred to Date	$776,685,000		'	'
Expected Costs to Complete	477,094,000	[1]	'	'
Ground Leases	'		'	'
Real Estate Properties [Line Items]	'		'	'
Number of Real Estate Properties	6		'	'
2013	5,270,000	[2]	'	'
2014	5,270,000	[2]	'	'
2015	5,270,000	[2]	'	'
2016	5,270,000	[2]	'	'
2017	5,270,000	[2]	'	'
Thereafter	314,501,000	[2]	'	'
Rent expense	5,200,000		5,100,000	4,900,000
United Dominion Reality L.P.	'		'	'
Real Estate Properties [Line Items]	'		'	'
Capital Expenditures Incurred but Not yet Paid	6,371,000		7,440,000	721,000
Costs Incurred to Date	152,644,000		'	'
Expected Costs to Complete	54,656,000	[1]	'	'
United Dominion Reality L.P. | Ground Leases	'		'	'
Real Estate Properties [Line Items]	'		'	'
Number of Real Estate Properties	5		'	'
2013	5,200,000		'	'
2014	5,200,000		'	'
2015	5,200,000		'	'
2016	5,200,000		'	'
2017	5,200,000		'	'
Thereafter	314,300,000	[2]	'	'
Rent expense	5,100,000		5,000,000	4,900,000
Wholly-owned b redevelopment	'		'	'
Real Estate Properties [Line Items]	'		'	'
Capital Expenditures Incurred but Not yet Paid	7,700,000		'	'
Number of Real Estate Properties	2		'	'
Costs Incurred to Date	134,261,000		'	'
Wholly-owned b redevelopment | United Dominion Reality L.P.	'		'	'
Real Estate Properties [Line Items]	'		'	'
Capital Expenditures Incurred but Not yet Paid	2,400,000		'	'
Number of Real Estate Properties	1		'	'
Costs Incurred to Date	72,581,000		'	'
Expected Costs to Complete	2,719,000	[1]	'	'
Wholly-owned b under development	'		'	'
Real Estate Properties [Line Items]	'		'	'
Capital Expenditures Incurred but Not yet Paid	41,800,000		'	'
Number of Real Estate Properties	6		'	'
Costs Incurred to Date	467,413,000		'	'
Wholly-owned b under development | United Dominion Reality L.P.	'		'	'
Real Estate Properties [Line Items]	'		'	'
Capital Expenditures Incurred but Not yet Paid	7,900,000		'	'
Number of Real Estate Properties	1		'	'
Costs Incurred to Date	80,063,000		'	'
Expected Costs to Complete	$51,937,000	[1]	'	'
[1]	Costs incurred to date include $41.8 million and $7.7 million of accrued fixed assets for development and redevelopment, respectively.
[2]	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_Segments_UNITED_DOM2

Reportable Segments (UNITED DOMINION REALTY, L.P.) (Details) (USD $)

3 Months Ended

12 Months Ended

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2009

Segments

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Number of reportable segments

'

'

'

'

'

'

'

'

2

'

'

'

Condition for Community considered to have stabilized occupancy

'

'

'

'

'

'

'

'

'90% occupancy for at least three consecutive months

'

'

'

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

'

'

'

'

'

'

'

'

$758,926,000

$716,612,000

$623,357,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

514,041,000

504,200,000

484,760,000

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Property management

'

'

'

'

'

'

'

'

-20,780,000

-20,465,000

-20,101,000

'

Other operating expenses

'

'

'

'

'

'

'

'

-7,136,000

-5,718,000

-6,118,000

'

Depreciation and amortization

'

'

'

'

'

'

'

'

-341,490,000

-350,401,000

-370,343,000

'

Hurricane-related charges, net

'

'

'

'

'

'

'

'

'

'

0

'

General and administrative

'

'

'

'

'

'

'

'

-42,238,000

-43,792,000

-47,257,000

'

Insurance Recoveries

'

'

'

'

'

'

'

'

12,253,000

-8,495,000

0

'

Net gain on sale of depreciable property

'

'

'

'

'

'

'

'

40,449,000

251,554,000

125,290,000

'

Non-controlling interests

'

'

'

'

'

'

'

'

60,000

-140,000

-167,000

'

Net (loss)/income attributable to Entity

'

'

'

'

'

'

'

'

44,812,000

212,177,000

20,023,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

8,207,977,000

'

'

'

8,055,828,000

'

'

'

8,207,977,000

8,055,828,000

'

'

Accumulated depreciation

-2,208,794,000

'

'

'

-1,924,682,000

'

'

'

-2,208,794,000

-1,924,682,000

'

'

Total real estate owned, net of accumulated depreciation

5,999,183,000

'

'

'

6,131,146,000

'

'

'

5,999,183,000

6,131,146,000

'

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

30,249,000

'

'

'

12,115,000

'

'

'

30,249,000

12,115,000

12,503,000

9,486,000

Restricted cash

22,796,000

'

'

'

23,561,000

'

'

'

22,796,000

23,561,000

'

'

Deferred financing costs, net

26,924,000

'

'

'

24,990,000

'

'

'

26,924,000

24,990,000

'

'

Other assets

137,882,000

'

'

'

125,654,000

'

'

'

137,882,000

125,654,000

'

'

Total assets

6,807,722,000

'

'

'

6,859,103,000

'

'

'

6,807,722,000

6,859,103,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

452,057,000

422,480,000

189,711,000

'

Same Communities

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

50,400,000

48,400,000

43,100,000

'

Same Communities Western Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

232,374,000

219,988,000

204,570,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

165,657,000

154,496,000

141,797,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

2,323,850,000

'

'

'

2,325,934,000

'

'

'

2,323,850,000

2,325,934,000

'

'

Same Communities Mid-Atlantic Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

166,518,000

161,991,000

152,833,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

115,805,000

112,699,000

105,213,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

1,431,590,000

'

'

'

1,419,873,000

'

'

'

1,431,590,000

1,419,873,000

'

'

Same Communities Northeast Region [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

58,073,000

54,460,000

37,553,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

42,353,000

39,376,000

27,181,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

738,805,000

'

'

'

723,437,000

'

'

'

738,805,000

723,437,000

'

'

Same Communities Southeastern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

116,192,000

110,461,000

105,004,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

75,825,000

71,218,000

66,202,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

889,753,000

'

'

'

887,483,000

'

'

'

889,753,000

887,483,000

'

'

Same Communities Southwestern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

40,576,000

38,099,000

35,266,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

24,869,000

22,817,000

20,319,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

350,158,000

'

'

'

346,449,000

'

'

'

350,158,000

346,449,000

'

'

Non-Mature communities/Other

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

141,903,000

159,245,000

195,732,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

89,532,000

103,594,000

124,048,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

2,473,821,000

'

'

'

2,352,652,000

'

'

'

2,473,821,000

2,352,652,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

5,400,000

6,700,000

14,700,000

'

Minimum

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Percent occupancy to be considered a community

'

'

'

'

'

'

'

'

90.00%

'

'

'

Time to maintain percent occupancy to be considered a community

'

'

'

'

'

'

'

'

'3 months

'

'

'

United Dominion Reality L.P.

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Related party management fee percentage

'

'

'

'

'

'

'

'

2.75%

'

'

'

Number of reportable segments

'

'

'

'

'

'

'

'

2

'

'

'

Condition for Community considered to have stabilized occupancy

'

'

'

'

'

'

'

'

'once it achieves 90% occupancy for at least three consecutive months

'

'

'

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

'

'

'

'

'

'

'

'

410,842,000

400,691,000

387,057,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

287,535,000

281,538,000

264,258,000

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Property management

'

'

'

'

'

'

'

'

-11,298,000

-11,019,000

-10,644,000

'

Other operating expenses

'

'

'

'

'

'

'

'

-5,728,000

-5,272,000

-5,484,000

'

Depreciation and amortization

'

'

'

'

'

'

'

'

-181,302,000

-195,051,000

-197,964,000

'

Interest

'

'

'

'

'

'

'

'

-36,058,000

-45,234,000

-53,632,000

'

General and administrative

'

'

'

'

'

'

'

'

-24,808,000

-26,204,000

-26,370,000

'

Insurance Recoveries

'

'

'

'

'

'

'

'

-8,083,000

5,518,000

0

'

Net gain on sale of depreciable property

'

'

'

'

'

'

'

'

41,518,000

51,094,000

60,065,000

'

Non-controlling interests

'

'

'

'

'

'

'

'

-4,566,000

-352,000

-70,000

'

Net (loss)/income attributable to Entity

44,482,000

11,011,000

10,154,000

7,729,000

-349,000

85,000

51,172,000

-6,926,000

73,376,000

43,982,000

30,159,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

4,188,480,000

'

'

'

4,182,920,000

'

'

'

4,188,480,000

4,182,920,000

'

'

Accumulated depreciation

-1,241,574,000

'

'

'

-1,097,133,000

'

'

'

-1,241,574,000

-1,097,133,000

'

'

Total real estate owned, net of accumulated depreciation

2,946,906,000

'

'

'

3,085,787,000

'

'

'

2,946,906,000

3,085,787,000

'

'

Reconciling items:

'

'

'

'

'

'

'

'

'

'

'

'

Cash and cash equivalents

1,897,000

'

'

'

2,804,000

'

'

'

1,897,000

2,804,000

704,000

920,000

Restricted cash

13,526,000

'

'

'

12,926,000

'

'

'

13,526,000

12,926,000

'

'

Deferred financing costs, net

5,848,000

'

'

'

6,072,000

'

'

'

5,848,000

6,072,000

'

'

Other assets

25,064,000

'

'

'

28,665,000

'

'

'

25,064,000

28,665,000

'

'

Total assets

2,993,241,000

'

'

'

3,136,254,000

'

'

'

2,993,241,000

3,136,254,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

151,002,000

115,355,000

63,191,000

'

United Dominion Reality L.P. | Same Communities

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

25,900,000

27,200,000

'

'

United Dominion Reality L.P. | Same Communities Western Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

175,384,000

166,181,000

156,587,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

125,956,000

117,744,000

109,672,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

1,664,314,000

'

'

'

1,651,316,000

'

'

'

1,664,314,000

1,651,316,000

'

'

United Dominion Reality L.P. | Same Communities Mid-Atlantic Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

68,205,000

66,487,000

64,020,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

46,770,000

45,801,000

44,400,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

706,447,000

'

'

'

701,741,000

'

'

'

706,447,000

701,741,000

'

'

United Dominion Reality L.P. | Same Communities Northeast Region [Member]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

443,483,000

'

'

'

434,138,000

'

'

'

443,483,000

434,138,000

'

'

United Dominion Reality L.P. | Same Communities Southeastern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

43,208,000

40,771,000

38,606,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

28,105,000

26,510,000

24,212,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

328,150,000

'

'

'

322,882,000

'

'

'

328,150,000

322,882,000

'

'

United Dominion Reality L.P. | Same Communities Southwestern Region

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

21,105,000

19,859,000

18,286,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

13,293,000

12,225,000

10,994,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

186,934,000

'

'

'

185,501,000

'

'

'

186,934,000

185,501,000

'

'

United Dominion Reality L.P. | Non-Mature communities/Other

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Reportable apartment home segment rental income

'

'

'

'

'

'

'

'

66,317,000

72,814,000

85,150,000

'

Reportable apartment home segment NOI

'

'

'

'

'

'

'

'

46,262,000

53,605,000

57,151,000

'

Reportable apartment home segment assets:

'

'

'

'

'

'

'

'

'

'

'

'

Total segment assets

859,152,000

'

'

'

887,342,000

'

'

'

859,152,000

887,342,000

'

'

Reportable Segments Additional (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Capital expenditures related to segments

'

'

'

'

'

'

'

'

$1,900,000

$2,700,000

'

'

United Dominion Reality L.P. | Minimum

'

'

'

'

'

'

'

'

'

'

'

'

Reportable Segment (Textual) [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

Percent occupancy to be considered a community

'

'

'

'

'

'

'

'

90.00%

'

'

'

Time to maintain percent occupancy to be considered a community

'

'

'

'

'

'

'

'

'3 months

'

'

'

Hurricane_Related_Charges_UNIT1

Hurricane Related Charges (UNITED DOMINION REALTY, L.P.) (Details) (USD $)

12 Months Ended

3 Months Ended

12 Months Ended

12 Months Ended

4 Months Ended

12 Months Ended

4 Months Ended

12 Months Ended

4 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Apr. 30, 2013

Dec. 31, 2013

Apr. 30, 2013

Dec. 31, 2013

Apr. 30, 2013

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Casualty Gain [Member]

Rent concessions

Rent not contractually receivable

New York Properties [Member]

New York Properties [Member]

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

United Dominion Reality L.P.

Business Interruption [Member]

Business Interruption [Member]

FY 2013 [Member]

FY 2013 [Member]

FY 2012 [Member]

FY 2012 [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Apartment_Homes

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Casualty Gain [Member]

Rent concessions

Rent not contractually receivable

New York Properties [Member]

Hurricane Sandy [Member]

United Dominion Reality L.P.

Business Interruption [Member]

Business Interruption [Member]

Business Interruption [Member]

Business Interruption [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Communities

Hurricane Sandy [Member]

Hurricane Sandy [Member]

United Dominion Reality L.P.

Hurricane Sandy [Member]

United Dominion Reality L.P.

Apartment_Homes

Hurricane Sandy [Member]

Hurricane Sandy [Member]

Hurricane Related Charges [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Communities Owned

'

'

'

'

'

'

'

'

'

3

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

Number of Apartments Owned

'

'

'

'

'

'

'

'

'

1,706

'

'

'

'

'

'

'

'

'

1,001

'

'

'

'

'

'

Impairment of Long-Lived Assets Held-for-use

'

'

'

'

'

'

'

'

$0

$9,000,000

'

'

'

$7,100,000

$0

'

'

'

'

'

'

'

'

'

'

'

Other Cost and Expense, Operating

7,136,000

5,718,000

6,118,000

'

'

'

'

'

'

10,400,000

5,728,000

5,272,000

5,484,000

7,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Total Estimated Insurance Recovery

'

'

'

14,500,000

'

'

'

'

'

'

'

'

'

'

'

10,800,000

'

'

'

'

'

'

'

'

'

'

Proceeds from Insurance Settlement, Investing Activities

2,600,000

4,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,800,000

4,200,000

2,600,000

2,100,000

4,200,000

2,100,000

Insurance Recoveries

12,253,000

-8,495,000

0

4,800,000

'

654,000

'

'

'

'

-8,083,000

5,518,000

0

'

3,300,000

'

582,000

'

'

'

'

'

'

'

'

'

Other Nonrecurring Expense

'

'

'

$3,400,000

$4,400,000

'

$3,600,000

$767,000

'

'

'

'

'

'

$2,100,000

$2,200,000

'

$1,800,000

$400,000

'

'

'

'

'

'

'

Unaudited_Summarized_Consolida5

Unaudited Summarized Consolidated Quarterly Financial Data (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended																12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]	'		'		'		'		'		'		'		'		'	'	'
Rental income	$190,321	[1]	$187,917	[1]	$186,285	[1]	$181,961	[1]	$180,150	[1]	$179,448	[1]	$175,153	[1]	$169,950	[1]	'	'	'
Income/(loss) from continuing operations	-3,374		2,351		4,525		-1,162		-13,972		-9,287		-23,961		915		2,340	-46,305	-126,869
Income/(loss) from discontinued operations, net of tax	41,376		884		829		853		1,016		-389		180,268		85,713		43,942	266,608	147,454
Net income	'		'		'		'		'		'		'		'		44,812	212,177	20,023
Net (loss)/income attributable to stakeholders	35,769		2,257		4,261		-1,199		-13,231		-9,962		145,721		80,848		41,088	203,376	10,537
Earnings per weighted average common share - basic and diluted:	'		'		'		'		'		'		'		'		'	'	'
Net (loss)/income attributable to common stockholders b basic and diluted (in dollars per share)	$0.14	[2]	$0.01	[2]	$0.02	[2]	($0.00)	[2]	($0.05)	[2]	($0.04)	[2]	$0.62	[2]	$0.37	[2]	$0.16	$0.85	$0.05
United Dominion Reality L.P.	'		'		'		'		'		'		'		'		'	'	'
Quarterly Financial Data [Abstract]	'		'		'		'		'		'		'		'		'	'	'
Rental income	102,104	[1]	101,558	[1]	100,421	[1]	97,770	[1]	97,547	[1]	97,974	[1]	95,766	[1]	93,659	[1]	401,853	384,946	344,937
Income/(loss) from continuing operations	6,488		10,069		9,339		6,870		-1,246		-532		-2,841		-8,690		32,766	-13,309	-40,744
Income/(loss) from discontinued operations, net of tax	42,407		982		882		905		945		656		54,243		1,799		45,176	57,643	70,973
Net income	$44,482		$11,011		$10,154		$7,729		($349)		$85		$51,172		($6,926)		$73,376	$43,982	$30,159
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted	$0.24	[3]	$0.06	[3]	$0.06	[3]	$0.04	[3]	$0		$0		$0.28		($0.04)		$0.40	$0.24	$0.17
[1]	Represents rental income from continuing operations, excluding amounts classified as discontinued operations.
[2]	Quarterly income/(loss) per share amounts may not total to the annual amounts due to rounding.
[3]	Quarterly income/(loss) per OP Unit amounts may not total to the annual amounts due to rounding

Schedule_III_Real_Estate_Owned2

Schedule - III Real Estate Owned (Details) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Total Carrying Value	'	$8,207,977,000		$8,055,828,000	$8,074,471,000	$6,881,347,000
Accumulated Depreciation	'	2,208,794,000		1,924,682,000	1,831,727,000	1,638,326,000
Aggregate cost for federal income tax purposes	'	7,500,000,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at beginning of the year	'	8,055,828,000		8,074,471,000	'	6,881,347,000
Real estate acquired	'	0		141,648,000	1,590,514,000	'
Capital expenditures and development	'	452,057,000		422,480,000	189,711,000	'
Real estate sold	-140,000,000	-70,687,000		-559,154,000	-587,101,000	'
Retirement of fully depreciated assets	'	0		-13,945,000	0	'
Hurricane related impairment of assets	'	-2,355,000		-9,672,000	0	'
Balance at end of the year	'	8,207,977,000		8,055,828,000	8,074,471,000	6,881,347,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at beginning of the year	'	1,924,682,000		1,831,727,000	'	1,638,326,000
Depreciation expense for the year	'	339,326,000		340,800,000	341,925,000	'
Accumulated depreciation on sales	'	-34,794,000		-233,207,000	-148,524,000	'
Accumulated depreciation on retirements of fully depreciated assets	'	-1,132,000		-13,945,000	0	'
SEC Schedule III, Real Estate Accumulated Depreciation, Other Additions	'	1,374,000		0	0	'
Write off of accumulated depreciation on hurricane related impaired assets	'	0		-693,000	0	'
Balance at end of year	'	2,208,794,000		1,924,682,000	1,831,727,000	1,638,326,000
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	'	0	[1]	'	'	'
Initial Costs, Land and Land Improvements	'	0	[1]	'	'	'
Initial Costs, Buildings and Improvements	'	0	[1]	'	'	'
Total Initial Acquisition Costs	'	0	[1]	'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,242,000	[1]	'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	0	[1]	'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	3,242,000	[1]	'	'	'
Total Carrying Value	'	3,242,000	[1]	'	'	'
Accumulated Depreciation	'	25,000	[1]	'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	3,242,000	[1]	'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,000	[1]	'	'	'
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	'	3,242,000		'	'	'
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	'	3,242,000		'	'	'
Total Carrying Value	'	3,242,000		'	'	'
Accumulated Depreciation	'	25,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	3,242,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,000		'	'	'
Real Estate Under Development	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	28,816,000		'	'	'
Initial Costs, Land and Land Improvements	'	85,982,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,786,000		'	'	'
Total Initial Acquisition Costs	'	98,768,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	368,645,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	94,383,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	373,030,000		'	'	'
Total Carrying Value	'	467,413,000		'	'	'
Accumulated Depreciation	'	1,411,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	467,413,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,411,000		'	'	'
Real Estate Under Development | UDR Pacific Los Alisos, LP [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	17,298,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	17,298,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	63,325,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,386,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	64,237,000		'	'	'
Total Carrying Value	'	80,623,000		'	'	'
Accumulated Depreciation	'	300,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,623,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	300,000		'	'	'
Real Estate Under Development | Mission Bay	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	23,625,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	23,625,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	117,643,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	23,653,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	117,615,000		'	'	'
Total Carrying Value	'	141,268,000		'	'	'
Accumulated Depreciation	'	116,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	141,268,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	116,000		'	'	'
Real Estate Under Development | DelRey Tower [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	297,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,786,000		'	'	'
Total Initial Acquisition Costs	'	13,083,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	66,980,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,447,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	70,616,000		'	'	'
Total Carrying Value	'	80,063,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,063,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Real Estate Under Development | Pier 4	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	24,584,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	24,584,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	54,418,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	24,584,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	54,418,000		'	'	'
Total Carrying Value	'	79,002,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	79,002,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Real Estate Under Development | DCO Beach Walk LLC	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	12,878,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	12,878,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,179,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	13,007,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,050,000		'	'	'
Total Carrying Value	'	28,057,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	28,057,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Real Estate Under Development | Domain College Park [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	28,816,000		'	'	'
Initial Costs, Land and Land Improvements	'	7,300,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	7,300,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	51,100,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,306,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	51,094,000		'	'	'
Total Carrying Value	'	58,400,000		'	'	'
Accumulated Depreciation	'	995,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	58,400,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	995,000		'	'	'
Land	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	48,096,000		'	'	'
Initial Costs, Buildings and Improvements	'	2,768,000		'	'	'
Total Initial Acquisition Costs	'	50,864,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	22,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	54,492,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,785,000		'	'	'
Total Carrying Value	'	73,277,000		'	'	'
Accumulated Depreciation	'	3,445,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	73,277,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	3,445,000		'	'	'
Land | 2919 Wilshire	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,773,000		'	'	'
Initial Costs, Buildings and Improvements	'	527,000		'	'	'
Total Initial Acquisition Costs	'	7,300,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	503,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,773,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,030,000		'	'	'
Total Carrying Value	'	7,803,000		'	'	'
Accumulated Depreciation	'	317,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	7,803,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	317,000		'	'	'
Land | 3032 Wilshire	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	9,963,000		'	'	'
Initial Costs, Buildings and Improvements	'	788,000		'	'	'
Total Initial Acquisition Costs	'	10,751,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	990,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,963,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,778,000		'	'	'
Total Carrying Value	'	11,741,000		'	'	'
Accumulated Depreciation	'	495,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	11,741,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	495,000		'	'	'
Land | 3033 Wilshire	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	11,055,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	11,055,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,249,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,049,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	7,255,000		'	'	'
Total Carrying Value	'	18,304,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	18,304,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Land | 7 Hardcourt	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	884,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	884,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,176,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	884,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	4,176,000		'	'	'
Total Carrying Value	'	5,060,000		'	'	'
Accumulated Depreciation	'	420,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	5,060,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	420,000		'	'	'
Land | Parkers Landing II TRS	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,710,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	1,710,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	762,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,511,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	961,000		'	'	'
Total Carrying Value	'	2,472,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	2,472,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Land | Presidio	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,524,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	1,524,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	921,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,300,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,145,000		'	'	'
Total Carrying Value	'	2,445,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	2,445,000		'	'	'
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	'	11,862,000		'	'	'
Initial Costs, Buildings and Improvements	'	93,000		'	'	'
Total Initial Acquisition Costs	'	11,955,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	129,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,862,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	222,000		'	'	'
Total Carrying Value	'	12,084,000		'	'	'
Accumulated Depreciation	'	249,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,084,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	249,000		'	'	'
Land | Vitruvian	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,325,000		'	'	'
Initial Costs, Buildings and Improvements	'	1,360,000		'	'	'
Total Initial Acquisition Costs	'	5,685,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,683,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,218,000		'	'	'
Total Carrying Value	'	13,368,000		'	'	'
Accumulated Depreciation	'	1,964,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,368,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,964,000		'	'	'
Land | Grandview DCO	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,266,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,702,000		'	'	'
Total Initial Acquisition Costs	'	16,968,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	-249,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,751,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	5,969,000		'	'	'
Total Carrying Value	'	16,720,000		'	'	'
Accumulated Depreciation	'	6,568,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,720,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,568,000		'	'	'
Real Estate Held for Disposition [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,266,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,702,000		'	'	'
Total Initial Acquisition Costs	'	16,968,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	-249,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,751,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	5,969,000		'	'	'
Total Carrying Value	'	16,720,000		'	'	'
Accumulated Depreciation	'	6,568,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,720,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,568,000		'	'	'
Commercial Held for Development	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	32,351,000		'	'	'
Initial Costs, Buildings and Improvements	'	19,108,000		'	'	'
Total Initial Acquisition Costs	'	51,459,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,281,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	40,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	22,543,000		'	'	'
Total Carrying Value	'	62,740,000		'	'	'
Accumulated Depreciation	'	9,119,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	62,740,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,119,000		'	'	'
Commercial Held for Development | Hanover Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,624,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	1,624,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	0		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,104,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	520,000		'	'	'
Total Carrying Value	'	1,624,000		'	'	'
Accumulated Depreciation	'	553,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,624,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	553,000		'	'	'
Commercial Held for Development | Circle Towers Office Bldg	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,407,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,498,000		'	'	'
Total Initial Acquisition Costs	'	5,905,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,518,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,380,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	6,043,000		'	'	'
Total Carrying Value	'	7,423,000		'	'	'
Accumulated Depreciation	'	1,789,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	7,423,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,789,000		'	'	'
Commercial Held for Development | Brookhaven Shopping Center	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,943,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,093,000		'	'	'
Total Initial Acquisition Costs	'	12,036,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,487,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,793,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,730,000		'	'	'
Total Carrying Value	'	21,523,000		'	'	'
Accumulated Depreciation	'	6,278,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	21,523,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,278,000		'	'	'
Commercial Held for Development | Bellevue Plaza retail	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	24,377,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,517,000		'	'	'
Total Initial Acquisition Costs	'	31,894,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	276,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	29,920,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,250,000		'	'	'
Total Carrying Value	'	32,170,000		'	'	'
Accumulated Depreciation	'	499,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	32,170,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	499,000		'	'	'
Commercial Held for Development | TOTAL COMMERCIAL & CORPORATE	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	32,351,000		'	'	'
Initial Costs, Buildings and Improvements	'	19,108,000		'	'	'
Total Initial Acquisition Costs	'	51,459,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	14,523,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	40,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	25,785,000		'	'	'
Total Carrying Value	'	65,982,000		'	'	'
Accumulated Depreciation	'	9,144,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	65,982,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,144,000		'	'	'
Commercial Held for Development | Total Real Estate Owned	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	1,442,077,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,737,466,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,323,367,000		'	'	'
Total Initial Acquisition Costs	'	6,060,833,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,147,143,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,952,265,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	6,255,712,000		'	'	'
Total Carrying Value	'	8,207,977,000		'	'	'
Accumulated Depreciation	'	2,208,794,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	8,207,977,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	2,208,794,000		'	'	'
Western Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	540,983,000		'	'	'
Initial Costs, Land and Land Improvements	'	834,196,000		'	'	'
Initial Costs, Buildings and Improvements	'	1,495,623,000		'	'	'
Total Initial Acquisition Costs	'	2,329,819,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	804,057,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	904,701,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,229,175,000		'	'	'
Total Carrying Value	'	3,133,876,000		'	'	'
Accumulated Depreciation	'	844,928,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	3,133,876,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	844,928,000		'	'	'
Western Region | Harbor at Mesa Verde	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	50,358,000		'	'	'
Initial Costs, Land and Land Improvements	'	20,476,000		'	'	'
Initial Costs, Buildings and Improvements	'	28,538,000		'	'	'
Total Initial Acquisition Costs	'	49,014,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	12,291,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	20,963,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	40,342,000		'	'	'
Total Carrying Value	'	61,305,000		'	'	'
Accumulated Depreciation	'	24,805,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,305,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,805,000		'	'	'
Western Region | 27 Seventy FIve Mesa Verde [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,660,000		'	'	'
Initial Costs, Land and Land Improvements	'	99,329,000		'	'	'
Initial Costs, Buildings and Improvements	'	110,644,000		'	'	'
Total Initial Acquisition Costs	'	209,973,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	83,889,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	107,578,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	186,284,000		'	'	'
Total Carrying Value	'	293,862,000		'	'	'
Accumulated Depreciation	'	57,965,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	293,862,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	57,965,000		'	'	'
Western Region | Pacific Shores	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	34,112,000		'	'	'
Initial Costs, Land and Land Improvements	'	7,345,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,624,000		'	'	'
Total Initial Acquisition Costs	'	29,969,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	31,056,000		'	'	'
Total Carrying Value	'	38,777,000		'	'	'
Accumulated Depreciation	'	18,492,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,777,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,492,000		'	'	'
Western Region | Huntington Vista	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	27,972,000		'	'	'
Initial Costs, Land and Land Improvements	'	8,055,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,486,000		'	'	'
Total Initial Acquisition Costs	'	30,541,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,972,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,312,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,201,000		'	'	'
Total Carrying Value	'	37,513,000		'	'	'
Accumulated Depreciation	'	17,615,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	37,513,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,615,000		'	'	'
Western Region | Missions at Back Bay	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	229,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,129,000		'	'	'
Total Initial Acquisition Costs	'	14,358,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,045,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,778,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	5,625,000		'	'	'
Total Carrying Value	'	16,403,000		'	'	'
Accumulated Depreciation	'	3,772,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,403,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	3,772,000		'	'	'
Western Region | Coronado at Newport b North	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	62,516,000		'	'	'
Initial Costs, Buildings and Improvements	'	46,082,000		'	'	'
Total Initial Acquisition Costs	'	108,598,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	23,596,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	66,683,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	65,511,000		'	'	'
Total Carrying Value	'	132,194,000		'	'	'
Accumulated Depreciation	'	38,108,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	132,194,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,108,000		'	'	'
Western Region | Huntington Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	50,771,000		'	'	'
Initial Costs, Land and Land Improvements	'	61,535,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,017,000		'	'	'
Total Initial Acquisition Costs	'	79,552,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,378,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	62,096,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	23,834,000		'	'	'
Total Carrying Value	'	85,930,000		'	'	'
Accumulated Depreciation	'	14,471,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	85,930,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,471,000		'	'	'
Western Region | Vista Del Rey	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,670,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,080,000		'	'	'
Total Initial Acquisition Costs	'	17,750,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,908,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,819,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,839,000		'	'	'
Total Carrying Value	'	19,658,000		'	'	'
Accumulated Depreciation	'	5,270,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,658,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	5,270,000		'	'	'
Western Region | Foxborough	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	12,071,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,187,000		'	'	'
Total Initial Acquisition Costs	'	18,258,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,669,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	12,328,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,599,000		'	'	'
Total Carrying Value	'	20,927,000		'	'	'
Accumulated Depreciation	'	4,660,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	20,927,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,660,000		'	'	'
Western Region | Coronado South	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	58,785,000		'	'	'
Initial Costs, Buildings and Improvements	'	50,067,000		'	'	'
Total Initial Acquisition Costs	'	108,852,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,881,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	59,183,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	66,550,000		'	'	'
Total Carrying Value	'	125,733,000		'	'	'
Accumulated Depreciation	'	36,990,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	125,733,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	36,990,000		'	'	'
Western Region | 1818 Platinum Triangle	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	16,663,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,905,000		'	'	'
Total Initial Acquisition Costs	'	68,568,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	125,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,693,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	52,000,000		'	'	'
Total Carrying Value	'	68,693,000		'	'	'
Accumulated Depreciation	'	10,493,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	68,693,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,493,000		'	'	'
Western Region | ORANGE COUNTY, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	193,873,000		'	'	'
Initial Costs, Land and Land Improvements	'	382,674,000		'	'	'
Initial Costs, Buildings and Improvements	'	377,759,000		'	'	'
Total Initial Acquisition Costs	'	760,433,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	287,747,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	408,191,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	639,989,000		'	'	'
Total Carrying Value	'	1,048,180,000		'	'	'
Accumulated Depreciation	'	235,713,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,048,180,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	235,713,000		'	'	'
Western Region | 2000 Post Street	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	9,861,000		'	'	'
Initial Costs, Buildings and Improvements	'	44,578,000		'	'	'
Total Initial Acquisition Costs	'	54,439,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,254,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,221,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	51,472,000		'	'	'
Total Carrying Value	'	61,693,000		'	'	'
Accumulated Depreciation	'	22,853,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,693,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,853,000		'	'	'
Western Region | Birch Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,365,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,696,000		'	'	'
Total Initial Acquisition Costs	'	21,061,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,026,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	22,185,000		'	'	'
Total Carrying Value	'	27,211,000		'	'	'
Accumulated Depreciation	'	12,068,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,211,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,068,000		'	'	'
Western Region | Highlands Of Marin	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,996,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,868,000		'	'	'
Total Initial Acquisition Costs	'	30,864,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	25,534,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,095,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	49,303,000		'	'	'
Total Carrying Value	'	56,398,000		'	'	'
Accumulated Depreciation	'	23,816,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	56,398,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,816,000		'	'	'
Western Region | Marina Playa	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,224,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,916,000		'	'	'
Total Initial Acquisition Costs	'	30,140,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,811,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,886,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,065,000		'	'	'
Total Carrying Value	'	38,951,000		'	'	'
Accumulated Depreciation	'	17,166,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,951,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,166,000		'	'	'
Western Region | River Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	33,130,000		'	'	'
Initial Costs, Land and Land Improvements	'	22,161,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,137,000		'	'	'
Total Initial Acquisition Costs	'	62,298,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,851,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,308,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	42,841,000		'	'	'
Total Carrying Value	'	65,149,000		'	'	'
Accumulated Depreciation	'	21,251,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	65,149,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,251,000		'	'	'
Western Region | CitySouth	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	14,031,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,537,000		'	'	'
Total Initial Acquisition Costs	'	44,568,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	35,031,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,220,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,379,000		'	'	'
Total Carrying Value	'	79,599,000		'	'	'
Accumulated Depreciation	'	25,108,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	79,599,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,108,000		'	'	'
Western Region | Bay Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,545,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,458,000		'	'	'
Total Initial Acquisition Costs	'	23,003,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,357,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,947,000		'	'	'
Total Carrying Value	'	27,360,000		'	'	'
Accumulated Depreciation	'	7,730,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,360,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,730,000		'	'	'
Western Region | Highlands of Marin Phase II	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,353,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,559,000		'	'	'
Total Initial Acquisition Costs	'	23,912,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,038,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,753,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,197,000		'	'	'
Total Carrying Value	'	34,950,000		'	'	'
Accumulated Depreciation	'	11,297,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	34,950,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,297,000		'	'	'
Western Region | Edgewater	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	30,657,000		'	'	'
Initial Costs, Buildings and Improvements	'	83,872,000		'	'	'
Total Initial Acquisition Costs	'	114,529,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,861,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	30,675,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	86,715,000		'	'	'
Total Carrying Value	'	117,390,000		'	'	'
Accumulated Depreciation	'	29,050,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	117,390,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,050,000		'	'	'
Western Region | Almaden Lake Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	27,000,000		'	'	'
Initial Costs, Land and Land Improvements	'	594,000		'	'	'
Initial Costs, Buildings and Improvements	'	42,515,000		'	'	'
Total Initial Acquisition Costs	'	43,109,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,367,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	729,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	46,747,000		'	'	'
Total Carrying Value	'	47,476,000		'	'	'
Accumulated Depreciation	'	15,391,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	47,476,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,391,000		'	'	'
Western Region | 388 Beale	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	14,253,000		'	'	'
Initial Costs, Buildings and Improvements	'	74,104,000		'	'	'
Total Initial Acquisition Costs	'	88,357,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,836,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,274,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	77,919,000		'	'	'
Total Carrying Value	'	92,193,000		'	'	'
Accumulated Depreciation	'	11,688,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	92,193,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,688,000		'	'	'
Western Region | 2000 Post III	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,756,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,753,000		'	'	'
Total Initial Acquisition Costs	'	9,509,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,001,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,291,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,219,000		'	'	'
Total Carrying Value	'	12,510,000		'	'	'
Accumulated Depreciation	'	4,965,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,510,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,965,000		'	'	'
Western Region | SAN FRANCISCO, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	60,130,000		'	'	'
Initial Costs, Land and Land Improvements	'	123,796,000		'	'	'
Initial Costs, Buildings and Improvements	'	421,993,000		'	'	'
Total Initial Acquisition Costs	'	545,789,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	115,091,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	133,891,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	526,989,000		'	'	'
Total Carrying Value	'	660,880,000		'	'	'
Accumulated Depreciation	'	202,383,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	660,880,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	202,383,000		'	'	'
Western Region | Rosebeach	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,414,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,449,000		'	'	'
Total Initial Acquisition Costs	'	25,863,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,664,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,558,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	19,969,000		'	'	'
Total Carrying Value	'	28,527,000		'	'	'
Accumulated Depreciation	'	10,949,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	28,527,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,949,000		'	'	'
Western Region | Ocean Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,135,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,789,000		'	'	'
Total Initial Acquisition Costs	'	17,924,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,671,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,245,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,350,000		'	'	'
Total Carrying Value	'	19,595,000		'	'	'
Accumulated Depreciation	'	7,652,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,595,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,652,000		'	'	'
Western Region | Tierra Del Rey	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	32,635,000		'	'	'
Initial Costs, Land and Land Improvements	'	39,586,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,679,000		'	'	'
Total Initial Acquisition Costs	'	76,265,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,584,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	39,646,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,203,000		'	'	'
Total Carrying Value	'	78,849,000		'	'	'
Accumulated Depreciation	'	14,238,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	78,849,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,238,000		'	'	'
Western Region | The Westerly	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	67,700,000		'	'	'
Initial Costs, Land and Land Improvements	'	48,182,000		'	'	'
Initial Costs, Buildings and Improvements	'	102,364,000		'	'	'
Total Initial Acquisition Costs	'	150,546,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	35,475,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	50,594,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	135,427,000		'	'	'
Total Carrying Value	'	186,021,000		'	'	'
Accumulated Depreciation	'	24,613,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	186,021,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,613,000		'	'	'
Western Region | Pine@Sixth	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,805,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,305,000		'	'	'
Total Initial Acquisition Costs	'	12,110,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	12,723,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,251,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,582,000		'	'	'
Total Carrying Value	'	24,833,000		'	'	'
Accumulated Depreciation	'	14,797,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	24,833,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,797,000		'	'	'
Western Region | Jefferson at Marina del Rey	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	55,651,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	55,651,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	88,695,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	61,189,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	83,157,000		'	'	'
Total Carrying Value	'	144,346,000		'	'	'
Accumulated Depreciation	'	23,239,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	144,346,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,239,000		'	'	'
Western Region | LOS ANGELES, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	100,335,000		'	'	'
Initial Costs, Land and Land Improvements	'	162,773,000		'	'	'
Initial Costs, Buildings and Improvements	'	175,586,000		'	'	'
Total Initial Acquisition Costs	'	338,359,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	143,812,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	171,483,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	310,688,000		'	'	'
Total Carrying Value	'	482,171,000		'	'	'
Accumulated Depreciation	'	95,488,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	482,171,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	95,488,000		'	'	'
Western Region | Arbor Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,453,000		'	'	'
Initial Costs, Buildings and Improvements	'	11,995,000		'	'	'
Total Initial Acquisition Costs	'	13,448,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,541,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,813,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,176,000		'	'	'
Total Carrying Value	'	16,989,000		'	'	'
Accumulated Depreciation	'	8,479,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,989,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,479,000		'	'	'
Western Region | Aspen Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	10,819,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,178,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,116,000		'	'	'
Total Initial Acquisition Costs	'	10,294,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,602,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,451,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,445,000		'	'	'
Total Carrying Value	'	12,896,000		'	'	'
Accumulated Depreciation	'	5,876,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,896,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	5,876,000		'	'	'
Western Region | Crowne Pointe	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,486,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,437,000		'	'	'
Total Initial Acquisition Costs	'	8,923,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,827,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,942,000		'	'	'
Total Carrying Value	'	13,750,000		'	'	'
Accumulated Depreciation	'	6,580,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,750,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,580,000		'	'	'
Western Region | Hilltop	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,174,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,408,000		'	'	'
Total Initial Acquisition Costs	'	9,582,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,432,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,658,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,356,000		'	'	'
Total Carrying Value	'	13,014,000		'	'	'
Accumulated Depreciation	'	6,008,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,014,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,008,000		'	'	'
Western Region | The Hawthorne	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	36,093,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,474,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,226,000		'	'	'
Total Initial Acquisition Costs	'	36,700,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,594,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,569,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,725,000		'	'	'
Total Carrying Value	'	39,294,000		'	'	'
Accumulated Depreciation	'	16,473,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,294,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	16,473,000		'	'	'
Western Region | The Kennedy	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,179,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,307,000		'	'	'
Total Initial Acquisition Costs	'	28,486,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,593,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,232,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	23,847,000		'	'	'
Total Carrying Value	'	30,079,000		'	'	'
Accumulated Depreciation	'	11,244,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	30,079,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,244,000		'	'	'
Western Region | Hearthstone at Merrill Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	23,341,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,848,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,922,000		'	'	'
Total Initial Acquisition Costs	'	37,770,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,407,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,957,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	33,220,000		'	'	'
Total Carrying Value	'	40,177,000		'	'	'
Accumulated Depreciation	'	11,289,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	40,177,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,289,000		'	'	'
Western Region | Island Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	21,284,000		'	'	'
Initial Costs, Buildings and Improvements	'	89,389,000		'	'	'
Total Initial Acquisition Costs	'	110,673,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,318,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,401,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	92,590,000		'	'	'
Total Carrying Value	'	113,991,000		'	'	'
Accumulated Depreciation	'	29,209,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	113,991,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,209,000		'	'	'
Western Region | Borgata	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,379,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,569,000		'	'	'
Total Initial Acquisition Costs	'	30,948,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	586,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,399,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	25,135,000		'	'	'
Total Carrying Value	'	31,534,000		'	'	'
Accumulated Depreciation	'	9,552,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	31,534,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,552,000		'	'	'
Western Region | elements too	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	27,468,000		'	'	'
Initial Costs, Buildings and Improvements	'	72,036,000		'	'	'
Total Initial Acquisition Costs	'	99,504,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,284,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	30,060,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	82,728,000		'	'	'
Total Carrying Value	'	112,788,000		'	'	'
Accumulated Depreciation	'	27,096,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	112,788,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	27,096,000		'	'	'
Western Region | 989elements	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,541,000		'	'	'
Initial Costs, Buildings and Improvements	'	45,990,000		'	'	'
Total Initial Acquisition Costs	'	54,531,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,054,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,538,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	47,047,000		'	'	'
Total Carrying Value	'	55,585,000		'	'	'
Accumulated Depreciation	'	10,860,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	55,585,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,860,000		'	'	'
Western Region | SEATTLE, WA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	70,253,000		'	'	'
Initial Costs, Land and Land Improvements	'	90,464,000		'	'	'
Initial Costs, Buildings and Improvements	'	350,395,000		'	'	'
Total Initial Acquisition Costs	'	440,859,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	39,238,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	94,886,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	385,211,000		'	'	'
Total Carrying Value	'	480,097,000		'	'	'
Accumulated Depreciation	'	142,666,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	480,097,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	142,666,000		'	'	'
Western Region | Presidio at Rancho Del Oro	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	9,164,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,694,000		'	'	'
Total Initial Acquisition Costs	'	31,858,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,270,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,722,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	28,406,000		'	'	'
Total Carrying Value	'	38,128,000		'	'	'
Accumulated Depreciation	'	16,802,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,128,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	16,802,000		'	'	'
Western Region | Villas at Carlsbad	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,517,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,718,000		'	'	'
Total Initial Acquisition Costs	'	17,235,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,059,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,722,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	12,572,000		'	'	'
Total Carrying Value	'	19,294,000		'	'	'
Accumulated Depreciation	'	6,607,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,294,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,607,000		'	'	'
Western Region | 13th & Market [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	34,780,000		'	'	'
Initial Costs, Land and Land Improvements	'	10,300,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	10,300,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	60,847,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,305,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	60,842,000		'	'	'
Total Carrying Value	'	71,147,000		'	'	'
Accumulated Depreciation	'	628,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	71,147,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	628,000		'	'	'
Western Region | SAN DIEGO, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	34,780,000		'	'	'
Initial Costs, Land and Land Improvements	'	25,981,000		'	'	'
Initial Costs, Buildings and Improvements	'	33,412,000		'	'	'
Total Initial Acquisition Costs	'	59,393,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	69,176,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	26,749,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	101,820,000		'	'	'
Total Carrying Value	'	128,569,000		'	'	'
Accumulated Depreciation	'	24,037,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	128,569,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,037,000		'	'	'
Western Region | Boronda Manor	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,946,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,982,000		'	'	'
Total Initial Acquisition Costs	'	10,928,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,126,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,145,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,909,000		'	'	'
Total Carrying Value	'	20,054,000		'	'	'
Accumulated Depreciation	'	7,952,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	20,054,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,952,000		'	'	'
Western Region | Garden Court	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	888,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,188,000		'	'	'
Total Initial Acquisition Costs	'	5,076,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,123,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,491,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,708,000		'	'	'
Total Carrying Value	'	10,199,000		'	'	'
Accumulated Depreciation	'	4,203,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,199,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,203,000		'	'	'
Western Region | Cambridge Court	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,039,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,883,000		'	'	'
Total Initial Acquisition Costs	'	15,922,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,910,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,635,000		'	'	'
Total Carrying Value	'	29,832,000		'	'	'
Accumulated Depreciation	'	12,143,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	29,832,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,143,000		'	'	'
Western Region | Laurel Tree	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,304,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,115,000		'	'	'
Total Initial Acquisition Costs	'	6,419,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,577,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,131,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,865,000		'	'	'
Total Carrying Value	'	11,996,000		'	'	'
Accumulated Depreciation	'	4,904,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	11,996,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,904,000		'	'	'
Western Region | The Pointe At Harden Ranch	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,388,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,854,000		'	'	'
Total Initial Acquisition Costs	'	30,242,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	24,885,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,816,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	45,311,000		'	'	'
Total Carrying Value	'	55,127,000		'	'	'
Accumulated Depreciation	'	21,627,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	55,127,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,627,000		'	'	'
Western Region | The Pointe At Northridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,044,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,028,000		'	'	'
Total Initial Acquisition Costs	'	10,072,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,451,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,242,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,281,000		'	'	'
Total Carrying Value	'	19,523,000		'	'	'
Accumulated Depreciation	'	8,239,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,523,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,239,000		'	'	'
Western Region | The Pointe At Westlake	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,329,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,334,000		'	'	'
Total Initial Acquisition Costs	'	6,663,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,883,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,129,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,417,000		'	'	'
Total Carrying Value	'	12,546,000		'	'	'
Accumulated Depreciation	'	4,854,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,546,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,854,000		'	'	'
Western Region | MONTEREY PENINSULA, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	16,938,000		'	'	'
Initial Costs, Buildings and Improvements	'	68,384,000		'	'	'
Total Initial Acquisition Costs	'	85,322,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	73,955,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	27,151,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	132,126,000		'	'	'
Total Carrying Value	'	159,277,000		'	'	'
Accumulated Depreciation	'	63,922,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	159,277,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	63,922,000		'	'	'
Western Region | Verano at Rancho Cucamonga Town Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,471,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,557,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,645,000		'	'	'
Total Initial Acquisition Costs	'	17,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	52,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,995,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	47,201,000		'	'	'
Total Carrying Value	'	70,196,000		'	'	'
Accumulated Depreciation	'	28,367,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	70,196,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	28,367,000		'	'	'
Western Region | Windemere at Sycamore Highland	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,810,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,450,000		'	'	'
Total Initial Acquisition Costs	'	29,260,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,437,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,041,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	25,656,000		'	'	'
Total Carrying Value	'	31,697,000		'	'	'
Accumulated Depreciation	'	15,998,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	31,697,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,998,000		'	'	'
Western Region | INLAND EMPIRE, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,471,000		'	'	'
Initial Costs, Land and Land Improvements	'	19,367,000		'	'	'
Initial Costs, Buildings and Improvements	'	27,095,000		'	'	'
Total Initial Acquisition Costs	'	46,462,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	55,431,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	29,036,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	72,857,000		'	'	'
Total Carrying Value	'	101,893,000		'	'	'
Accumulated Depreciation	'	44,365,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	101,893,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	44,365,000		'	'	'
Western Region | Tualatin Heights	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,273,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,134,000		'	'	'
Total Initial Acquisition Costs	'	12,407,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,204,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,813,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,798,000		'	'	'
Total Carrying Value	'	18,611,000		'	'	'
Accumulated Depreciation	'	9,082,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	18,611,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,082,000		'	'	'
Western Region | Andover Park	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	16,818,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,916,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,995,000		'	'	'
Total Initial Acquisition Costs	'	19,911,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,783,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,544,000		'	'	'
Total Carrying Value	'	27,694,000		'	'	'
Accumulated Depreciation	'	14,770,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,694,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,770,000		'	'	'
Western Region | Hunt Club	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,323,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,014,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,870,000		'	'	'
Total Initial Acquisition Costs	'	20,884,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,620,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,153,000		'	'	'
Total Carrying Value	'	26,504,000		'	'	'
Accumulated Depreciation	'	12,502,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,504,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,502,000		'	'	'
Western Region | PORTLAND, OR	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	35,141,000		'	'	'
Initial Costs, Land and Land Improvements	'	12,203,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,999,000		'	'	'
Total Initial Acquisition Costs	'	53,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,607,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	13,314,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	59,495,000		'	'	'
Total Carrying Value	'	72,809,000		'	'	'
Accumulated Depreciation	'	36,354,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	72,809,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	36,354,000		'	'	'
Western Region | The Residences at Bella Terra	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	25,000,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	25,000,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	122,185,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	25,037,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	122,148,000		'	'	'
Total Carrying Value	'	147,185,000		'	'	'
Accumulated Depreciation	'	3,072,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	147,185,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	3,072,000		'	'	'
Mid Atlantic Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	263,749,000		'	'	'
Initial Costs, Land and Land Improvements	'	216,901,000		'	'	'
Initial Costs, Buildings and Improvements	'	890,259,000		'	'	'
Total Initial Acquisition Costs	'	1,107,160,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	449,654,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	286,227,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,270,587,000		'	'	'
Total Carrying Value	'	1,556,814,000		'	'	'
Accumulated Depreciation	'	577,998,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,556,814,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	577,998,000		'	'	'
Mid Atlantic Region | Dominion Middle Ridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,317,000		'	'	'
Initial Costs, Land and Land Improvements	'	3,311,000		'	'	'
Initial Costs, Buildings and Improvements	'	13,283,000		'	'	'
Total Initial Acquisition Costs	'	16,594,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,302,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,730,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	19,166,000		'	'	'
Total Carrying Value	'	22,896,000		'	'	'
Accumulated Depreciation	'	12,969,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,896,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,969,000		'	'	'
Mid Atlantic Region | Dominion Lake Ridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	20,712,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,366,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,387,000		'	'	'
Total Initial Acquisition Costs	'	10,753,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,649,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,842,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,560,000		'	'	'
Total Carrying Value	'	16,402,000		'	'	'
Accumulated Depreciation	'	9,348,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,402,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,348,000		'	'	'
Mid Atlantic Region | Presidential Greens	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	11,238,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,790,000		'	'	'
Total Initial Acquisition Costs	'	30,028,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,330,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,579,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	26,779,000		'	'	'
Total Carrying Value	'	38,358,000		'	'	'
Accumulated Depreciation	'	17,910,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,358,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,910,000		'	'	'
Mid Atlantic Region | The Whitmore	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,418,000		'	'	'
Initial Costs, Buildings and Improvements	'	13,411,000		'	'	'
Total Initial Acquisition Costs	'	19,829,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,931,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,460,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,300,000		'	'	'
Total Carrying Value	'	39,760,000		'	'	'
Accumulated Depreciation	'	20,140,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,760,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	20,140,000		'	'	'
Mid Atlantic Region | Ridgewood	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,612,000		'	'	'
Initial Costs, Buildings and Improvements	'	20,086,000		'	'	'
Total Initial Acquisition Costs	'	25,698,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,864,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,986,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	27,576,000		'	'	'
Total Carrying Value	'	33,562,000		'	'	'
Accumulated Depreciation	'	18,660,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	33,562,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,660,000		'	'	'
Mid Atlantic Region | Commons at Town Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	136,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,724,000		'	'	'
Total Initial Acquisition Costs	'	7,860,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,399,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,874,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,385,000		'	'	'
Total Carrying Value	'	9,259,000		'	'	'
Accumulated Depreciation	'	1,393,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	9,259,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,393,000		'	'	'
Mid Atlantic Region | Waterside Towers	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	874,000		'	'	'
Initial Costs, Buildings and Improvements	'	38,209,000		'	'	'
Total Initial Acquisition Costs	'	39,083,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,828,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	26,396,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,515,000		'	'	'
Total Carrying Value	'	50,911,000		'	'	'
Accumulated Depreciation	'	15,623,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	50,911,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,623,000		'	'	'
Mid Atlantic Region | Waterside Townhomes	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	129,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,724,000		'	'	'
Total Initial Acquisition Costs	'	3,853,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	691,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,725,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,819,000		'	'	'
Total Carrying Value	'	4,544,000		'	'	'
Accumulated Depreciation	'	1,067,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	4,544,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,067,000		'	'	'
Mid Atlantic Region | Wellington Place at Olde Town	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	28,681,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,753,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,059,000		'	'	'
Total Initial Acquisition Costs	'	49,812,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,856,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,629,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	52,039,000		'	'	'
Total Carrying Value	'	66,668,000		'	'	'
Accumulated Depreciation	'	29,361,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	66,668,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,361,000		'	'	'
Mid Atlantic Region | Andover House	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	14,357,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,577,000		'	'	'
Total Initial Acquisition Costs	'	65,934,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,755,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,373,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	54,316,000		'	'	'
Total Carrying Value	'	68,689,000		'	'	'
Accumulated Depreciation	'	21,542,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	68,689,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,542,000		'	'	'
Mid Atlantic Region | Sullivan Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,137,000		'	'	'
Initial Costs, Buildings and Improvements	'	103,676,000		'	'	'
Total Initial Acquisition Costs	'	104,813,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,352,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,235,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	107,930,000		'	'	'
Total Carrying Value	'	109,165,000		'	'	'
Accumulated Depreciation	'	38,559,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	109,165,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,559,000		'	'	'
Mid Atlantic Region | Circle Towers	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	70,328,000		'	'	'
Initial Costs, Land and Land Improvements	'	32,815,000		'	'	'
Initial Costs, Buildings and Improvements	'	107,051,000		'	'	'
Total Initial Acquisition Costs	'	139,866,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,199,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	32,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	116,071,000		'	'	'
Total Carrying Value	'	149,065,000		'	'	'
Accumulated Depreciation	'	37,847,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	149,065,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	37,847,000		'	'	'
Mid Atlantic Region | Delancey at Shirlington	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	21,606,000		'	'	'
Initial Costs, Buildings and Improvements	'	66,765,000		'	'	'
Total Initial Acquisition Costs	'	88,371,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,441,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,621,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	68,191,000		'	'	'
Total Carrying Value	'	89,812,000		'	'	'
Accumulated Depreciation	'	22,662,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	89,812,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,662,000		'	'	'
Mid Atlantic Region | View 14	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,710,000		'	'	'
Initial Costs, Buildings and Improvements	'	97,941,000		'	'	'
Total Initial Acquisition Costs	'	103,651,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,348,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	100,278,000		'	'	'
Total Carrying Value	'	105,999,000		'	'	'
Accumulated Depreciation	'	14,274,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	105,999,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,274,000		'	'	'
Mid Atlantic Region | Signal Hill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	13,290,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	13,290,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	69,317,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	25,375,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	57,232,000		'	'	'
Total Carrying Value	'	82,607,000		'	'	'
Accumulated Depreciation	'	15,912,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	82,607,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,912,000		'	'	'
Mid Atlantic Region | METROPOLITAN DC	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	150,038,000		'	'	'
Initial Costs, Land and Land Improvements	'	164,145,000		'	'	'
Initial Costs, Buildings and Improvements	'	586,683,000		'	'	'
Total Initial Acquisition Costs	'	750,828,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	260,228,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	214,933,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	796,123,000		'	'	'
Total Carrying Value	'	1,011,056,000		'	'	'
Accumulated Depreciation	'	282,484,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,011,056,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	282,484,000		'	'	'
Mid Atlantic Region | Dominion Kings Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	14,768,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,565,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,007,000		'	'	'
Total Initial Acquisition Costs	'	8,572,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,132,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,896,000		'	'	'
Total Carrying Value	'	12,704,000		'	'	'
Accumulated Depreciation	'	7,693,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,704,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,693,000		'	'	'
Mid Atlantic Region | Dominion At Eden Brook	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,361,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,384,000		'	'	'
Total Initial Acquisition Costs	'	11,745,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,308,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,944,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,109,000		'	'	'
Total Carrying Value	'	18,053,000		'	'	'
Accumulated Depreciation	'	11,307,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	18,053,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,307,000		'	'	'
Mid Atlantic Region | Ellicott Grove	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,920,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,099,000		'	'	'
Total Initial Acquisition Costs	'	12,019,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	22,626,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,278,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,367,000		'	'	'
Total Carrying Value	'	34,645,000		'	'	'
Accumulated Depreciation	'	21,159,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	34,645,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,159,000		'	'	'
Mid Atlantic Region | Dominion Constant Friendship	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	10,683,000		'	'	'
Initial Costs, Land and Land Improvements	'	903,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,669,000		'	'	'
Total Initial Acquisition Costs	'	5,572,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,704,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,221,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,055,000		'	'	'
Total Carrying Value	'	9,276,000		'	'	'
Accumulated Depreciation	'	5,629,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	9,276,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	5,629,000		'	'	'
Mid Atlantic Region | Lakeside Mill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	15,242,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,666,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,109,000		'	'	'
Total Initial Acquisition Costs	'	12,775,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,189,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,919,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,045,000		'	'	'
Total Carrying Value	'	16,964,000		'	'	'
Accumulated Depreciation	'	10,290,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,964,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,290,000		'	'	'
Mid Atlantic Region | Tamar Meadow	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,145,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,150,000		'	'	'
Total Initial Acquisition Costs	'	21,295,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,707,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,559,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	21,443,000		'	'	'
Total Carrying Value	'	26,002,000		'	'	'
Accumulated Depreciation	'	14,199,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,002,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,199,000		'	'	'
Mid Atlantic Region | Calvertbs Walk	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,408,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,692,000		'	'	'
Total Initial Acquisition Costs	'	29,100,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,436,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,660,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,876,000		'	'	'
Total Carrying Value	'	35,536,000		'	'	'
Accumulated Depreciation	'	18,463,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,536,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,463,000		'	'	'
Mid Atlantic Region | Arborview Apartments	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,653,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,952,000		'	'	'
Total Initial Acquisition Costs	'	28,605,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,191,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,146,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,650,000		'	'	'
Total Carrying Value	'	35,796,000		'	'	'
Accumulated Depreciation	'	18,972,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,796,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,972,000		'	'	'
Mid Atlantic Region | Liriope Apartments	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,620,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,791,000		'	'	'
Total Initial Acquisition Costs	'	8,411,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,149,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,646,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	7,914,000		'	'	'
Total Carrying Value	'	9,560,000		'	'	'
Accumulated Depreciation	'	4,770,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	9,560,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,770,000		'	'	'
Mid Atlantic Region | 20 Lambourne	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	31,511,000		'	'	'
Initial Costs, Land and Land Improvements	'	11,750,000		'	'	'
Initial Costs, Buildings and Improvements	'	45,590,000		'	'	'
Total Initial Acquisition Costs	'	57,340,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,481,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,990,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	49,831,000		'	'	'
Total Carrying Value	'	61,821,000		'	'	'
Accumulated Depreciation	'	18,123,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,821,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,123,000		'	'	'
Mid Atlantic Region | Domain Brewers Hill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,669,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,630,000		'	'	'
Total Initial Acquisition Costs	'	45,299,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	502,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,675,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	41,126,000		'	'	'
Total Carrying Value	'	45,801,000		'	'	'
Accumulated Depreciation	'	7,953,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	45,801,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,953,000		'	'	'
Mid Atlantic Region | BALTIMORE, MD	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	72,204,000		'	'	'
Initial Costs, Land and Land Improvements	'	41,660,000		'	'	'
Initial Costs, Buildings and Improvements	'	199,073,000		'	'	'
Total Initial Acquisition Costs	'	240,733,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	65,425,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	46,846,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	259,312,000		'	'	'
Total Carrying Value	'	306,158,000		'	'	'
Accumulated Depreciation	'	138,558,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	306,158,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	138,558,000		'	'	'
Mid Atlantic Region | Dominion English Hills	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,979,000		'	'	'
Initial Costs, Buildings and Improvements	'	11,524,000		'	'	'
Total Initial Acquisition Costs	'	13,503,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,224,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,873,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,854,000		'	'	'
Total Carrying Value	'	21,727,000		'	'	'
Accumulated Depreciation	'	11,134,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	21,727,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,134,000		'	'	'
Mid Atlantic Region | Gayton Pointe Townhomes	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	826,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,148,000		'	'	'
Total Initial Acquisition Costs	'	5,974,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	29,095,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,386,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	31,683,000		'	'	'
Total Carrying Value	'	35,069,000		'	'	'
Accumulated Depreciation	'	24,775,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,069,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,775,000		'	'	'
Mid Atlantic Region | Waterside At Ironbridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,844,000		'	'	'
Initial Costs, Buildings and Improvements	'	13,239,000		'	'	'
Total Initial Acquisition Costs	'	15,083,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,980,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,293,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	19,770,000		'	'	'
Total Carrying Value	'	22,063,000		'	'	'
Accumulated Depreciation	'	12,304,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,063,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,304,000		'	'	'
Mid Atlantic Region | Carriage Homes at Wyndham	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	474,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,997,000		'	'	'
Total Initial Acquisition Costs	'	31,471,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,389,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,780,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	35,080,000		'	'	'
Total Carrying Value	'	38,860,000		'	'	'
Accumulated Depreciation	'	22,093,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,860,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,093,000		'	'	'
Mid Atlantic Region | Legacy at Mayland	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	41,507,000		'	'	'
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	'	20,453,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,966,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,487,000		'	'	'
Total Carrying Value	'	20,453,000		'	'	'
Accumulated Depreciation	'	16,639,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	20,453,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	16,639,000		'	'	'
Mid Atlantic Region | RICHMOND, VA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	41,507,000		'	'	'
Initial Costs, Land and Land Improvements	'	5,123,000		'	'	'
Initial Costs, Buildings and Improvements	'	60,908,000		'	'	'
Total Initial Acquisition Costs	'	66,031,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	72,141,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,298,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	123,874,000		'	'	'
Total Carrying Value	'	138,172,000		'	'	'
Accumulated Depreciation	'	86,945,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	138,172,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	86,945,000		'	'	'
Mid Atlantic Region | Forest Lake At Oyster Point	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	780,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,862,000		'	'	'
Total Initial Acquisition Costs	'	9,642,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,723,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,388,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,977,000		'	'	'
Total Carrying Value	'	18,365,000		'	'	'
Accumulated Depreciation	'	12,294,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	18,365,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,294,000		'	'	'
Mid Atlantic Region | Woodscape	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	798,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,209,000		'	'	'
Total Initial Acquisition Costs	'	8,007,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,447,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,053,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,401,000		'	'	'
Total Carrying Value	'	17,454,000		'	'	'
Accumulated Depreciation	'	13,149,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	17,454,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	13,149,000		'	'	'
Mid Atlantic Region | Eastwind	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	155,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,317,000		'	'	'
Total Initial Acquisition Costs	'	5,472,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,186,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	656,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,002,000		'	'	'
Total Carrying Value	'	11,658,000		'	'	'
Accumulated Depreciation	'	8,749,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	11,658,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,749,000		'	'	'
Mid Atlantic Region | Dominion Waterside At Lynnhaven	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,824,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,107,000		'	'	'
Total Initial Acquisition Costs	'	5,931,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,072,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,262,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,741,000		'	'	'
Total Carrying Value	'	12,003,000		'	'	'
Accumulated Depreciation	'	7,240,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,003,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,240,000		'	'	'
Mid Atlantic Region | Heather Lake	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	617,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,400,000		'	'	'
Total Initial Acquisition Costs	'	4,017,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,926,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,205,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	12,738,000		'	'	'
Total Carrying Value	'	13,943,000		'	'	'
Accumulated Depreciation	'	11,714,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,943,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,714,000		'	'	'
Mid Atlantic Region | Dominion Yorkshire Downs	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,089,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,582,000		'	'	'
Total Initial Acquisition Costs	'	9,671,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,839,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,575,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,935,000		'	'	'
Total Carrying Value	'	15,510,000		'	'	'
Accumulated Depreciation	'	8,793,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	15,510,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,793,000		'	'	'
Mid Atlantic Region | NORFOLK, VA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,263,000		'	'	'
Initial Costs, Buildings and Improvements	'	37,477,000		'	'	'
Total Initial Acquisition Costs	'	42,740,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	46,193,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,139,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	79,794,000		'	'	'
Total Carrying Value	'	88,933,000		'	'	'
Accumulated Depreciation	'	61,939,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	88,933,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	61,939,000		'	'	'
Mid Atlantic Region | Greens At Schumaker Pond	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	710,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,118,000		'	'	'
Total Initial Acquisition Costs	'	6,828,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,667,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,011,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,484,000		'	'	'
Total Carrying Value	'	12,495,000		'	'	'
Accumulated Depreciation	'	8,072,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,495,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,072,000		'	'	'
Mid Atlantic Region | OTHER MID-ATLANTIC	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	710,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,118,000		'	'	'
Total Initial Acquisition Costs	'	6,828,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,667,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,011,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,484,000		'	'	'
Total Carrying Value	'	12,495,000		'	'	'
Accumulated Depreciation	'	8,072,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,495,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,072,000		'	'	'
Mid Atlantic Region | Capitol View on 14th	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	31,393,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	31,393,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	91,966,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	31,393,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	91,966,000		'	'	'
Total Carrying Value	'	123,359,000		'	'	'
Accumulated Depreciation	'	5,217,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	123,359,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	5,217,000		'	'	'
Southeastern Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	161,587,000		'	'	'
Initial Costs, Land and Land Improvements	'	119,557,000		'	'	'
Initial Costs, Buildings and Improvements	'	452,965,000		'	'	'
Total Initial Acquisition Costs	'	572,522,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	317,232,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	152,927,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	736,827,000		'	'	'
Total Carrying Value	'	889,754,000		'	'	'
Accumulated Depreciation	'	457,921,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	889,754,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	457,921,000		'	'	'
Southeastern Region | Summit West	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,176,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,710,000		'	'	'
Total Initial Acquisition Costs	'	6,886,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,166,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,200,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,853,000		'	'	'
Total Carrying Value	'	15,053,000		'	'	'
Accumulated Depreciation	'	9,878,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	15,053,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,878,000		'	'	'
Southeastern Region | The Breyley	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,780,000		'	'	'
Initial Costs, Buildings and Improvements	'	2,458,000		'	'	'
Total Initial Acquisition Costs	'	4,238,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,895,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,292,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	17,841,000		'	'	'
Total Carrying Value	'	21,133,000		'	'	'
Accumulated Depreciation	'	15,476,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	21,133,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,476,000		'	'	'
Southeastern Region | Lakewood Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,835,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,395,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,647,000		'	'	'
Total Initial Acquisition Costs	'	12,042,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,597,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,260,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,379,000		'	'	'
Total Carrying Value	'	20,639,000		'	'	'
Accumulated Depreciation	'	13,036,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	20,639,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	13,036,000		'	'	'
Southeastern Region | Bay Meadow	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,893,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,254,000		'	'	'
Total Initial Acquisition Costs	'	12,147,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,924,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,220,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	17,851,000		'	'	'
Total Carrying Value	'	22,071,000		'	'	'
Accumulated Depreciation	'	12,779,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,071,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,779,000		'	'	'
Southeastern Region | Cambridge Woods	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,791,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,166,000		'	'	'
Total Initial Acquisition Costs	'	8,957,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,082,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,574,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,465,000		'	'	'
Total Carrying Value	'	17,039,000		'	'	'
Accumulated Depreciation	'	10,086,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	17,039,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,086,000		'	'	'
Southeastern Region | Sugar Mill Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,242,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,553,000		'	'	'
Total Initial Acquisition Costs	'	9,795,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,567,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,720,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,642,000		'	'	'
Total Carrying Value	'	16,362,000		'	'	'
Accumulated Depreciation	'	8,401,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,362,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,401,000		'	'	'
Southeastern Region | Inlet Bay	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,702,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,150,000		'	'	'
Total Initial Acquisition Costs	'	30,852,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,740,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,005,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	35,587,000		'	'	'
Total Carrying Value	'	44,592,000		'	'	'
Accumulated Depreciation	'	24,223,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	44,592,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,223,000		'	'	'
Southeastern Region | MacAlpine Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,869,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,858,000		'	'	'
Total Initial Acquisition Costs	'	47,727,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,862,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,264,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	43,325,000		'	'	'
Total Carrying Value	'	54,589,000		'	'	'
Accumulated Depreciation	'	24,392,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	54,589,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,392,000		'	'	'
Southeastern Region | The Vintage Lofts at West End	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,611,000		'	'	'
Initial Costs, Buildings and Improvements	'	37,663,000		'	'	'
Total Initial Acquisition Costs	'	44,274,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,317,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	15,111,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	44,480,000		'	'	'
Total Carrying Value	'	59,591,000		'	'	'
Accumulated Depreciation	'	15,843,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	59,591,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,843,000		'	'	'
Southeastern Region | Gallery at Bayport II	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,775,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,236,000		'	'	'
Total Initial Acquisition Costs	'	23,011,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,124,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,601,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	17,534,000		'	'	'
Total Carrying Value	'	26,135,000		'	'	'
Accumulated Depreciation	'	7,206,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,135,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,206,000		'	'	'
Southeastern Region | Island Walk	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,231,000		'	'	'
Initial Costs, Buildings and Improvements	'	19,897,000		'	'	'
Total Initial Acquisition Costs	'	27,128,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,342,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,032,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	33,438,000		'	'	'
Total Carrying Value	'	38,470,000		'	'	'
Accumulated Depreciation	'	20,797,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,470,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	20,797,000		'	'	'
Southeastern Region | TAMPA, FL	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,835,000		'	'	'
Initial Costs, Land and Land Improvements	'	50,465,000		'	'	'
Initial Costs, Buildings and Improvements	'	176,592,000		'	'	'
Total Initial Acquisition Costs	'	227,057,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	108,616,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	67,279,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	268,395,000		'	'	'
Total Carrying Value	'	335,674,000		'	'	'
Accumulated Depreciation	'	162,117,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	335,674,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	162,117,000		'	'	'
Southeastern Region | Seabrook	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,846,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,155,000		'	'	'
Total Initial Acquisition Costs	'	6,001,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,724,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,680,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,045,000		'	'	'
Total Carrying Value	'	13,725,000		'	'	'
Accumulated Depreciation	'	8,598,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,725,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,598,000		'	'	'
Southeastern Region | The Canopy Apartment Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,895,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,456,000		'	'	'
Total Initial Acquisition Costs	'	9,351,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	22,188,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,415,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	26,124,000		'	'	'
Total Carrying Value	'	31,539,000		'	'	'
Accumulated Depreciation	'	21,758,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	31,539,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,758,000		'	'	'
Southeastern Region | Altamira Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	15,640,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,533,000		'	'	'
Initial Costs, Buildings and Improvements	'	11,076,000		'	'	'
Total Initial Acquisition Costs	'	12,609,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,642,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,318,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	28,933,000		'	'	'
Total Carrying Value	'	32,251,000		'	'	'
Accumulated Depreciation	'	23,111,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	32,251,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,111,000		'	'	'
Southeastern Region | Regatta Shore	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	757,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,608,000		'	'	'
Total Initial Acquisition Costs	'	7,365,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	14,720,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,963,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,122,000		'	'	'
Total Carrying Value	'	22,085,000		'	'	'
Accumulated Depreciation	'	15,550,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,085,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,550,000		'	'	'
Southeastern Region | Alafaya Woods	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,366,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,653,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,042,000		'	'	'
Total Initial Acquisition Costs	'	10,695,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,554,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,491,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,758,000		'	'	'
Total Carrying Value	'	19,249,000		'	'	'
Accumulated Depreciation	'	11,938,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,249,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,938,000		'	'	'
Southeastern Region | Los Altos	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	22,308,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,804,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,349,000		'	'	'
Total Initial Acquisition Costs	'	15,153,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,689,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,904,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,938,000		'	'	'
Total Carrying Value	'	24,842,000		'	'	'
Accumulated Depreciation	'	13,324,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	24,842,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	13,324,000		'	'	'
Southeastern Region | Lotus Landing	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,185,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,639,000		'	'	'
Total Initial Acquisition Costs	'	10,824,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,111,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,794,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	17,141,000		'	'	'
Total Carrying Value	'	19,935,000		'	'	'
Accumulated Depreciation	'	10,407,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,935,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,407,000		'	'	'
Southeastern Region | Seville On The Green	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,282,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,498,000		'	'	'
Total Initial Acquisition Costs	'	7,780,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,484,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,686,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	12,578,000		'	'	'
Total Carrying Value	'	14,264,000		'	'	'
Accumulated Depreciation	'	8,054,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	14,264,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,054,000		'	'	'
Southeastern Region | Ashton @ Waterford	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	23,778,000		'	'	'
Initial Costs, Land and Land Improvements	'	3,872,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,538,000		'	'	'
Total Initial Acquisition Costs	'	21,410,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,364,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,162,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,612,000		'	'	'
Total Carrying Value	'	24,774,000		'	'	'
Accumulated Depreciation	'	12,156,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	24,774,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,156,000		'	'	'
Southeastern Region | Arbors at Lee Vista DCO	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,692,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,860,000		'	'	'
Total Initial Acquisition Costs	'	19,552,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	12,284,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,126,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,710,000		'	'	'
Total Carrying Value	'	31,836,000		'	'	'
Accumulated Depreciation	'	17,054,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	31,836,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,054,000		'	'	'
Southeastern Region | The Place on Millenia Blvd	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	12,172,000		'	'	'
Initial Costs, Buildings and Improvements	'	37,143,000		'	'	'
Total Initial Acquisition Costs	'	49,315,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,204,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	12,223,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,296,000		'	'	'
Total Carrying Value	'	51,519,000		'	'	'
Accumulated Depreciation	'	16,269,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	51,519,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	16,269,000		'	'	'
Southeastern Region | ORLANDO, FL	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	80,092,000		'	'	'
Initial Costs, Land and Land Improvements	'	37,691,000		'	'	'
Initial Costs, Buildings and Improvements	'	132,364,000		'	'	'
Total Initial Acquisition Costs	'	170,055,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	115,964,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	47,762,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	238,257,000		'	'	'
Total Carrying Value	'	286,019,000		'	'	'
Accumulated Depreciation	'	158,219,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	286,019,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	158,219,000		'	'	'
Southeastern Region | Legacy Hill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,148,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,867,000		'	'	'
Total Initial Acquisition Costs	'	7,015,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,460,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,754,000		'	'	'
Total Carrying Value	'	15,475,000		'	'	'
Accumulated Depreciation	'	10,377,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	15,475,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,377,000		'	'	'
Southeastern Region | Hickory Run	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,469,000		'	'	'
Initial Costs, Buildings and Improvements	'	11,584,000		'	'	'
Total Initial Acquisition Costs	'	13,053,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,295,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,086,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,262,000		'	'	'
Total Carrying Value	'	22,348,000		'	'	'
Accumulated Depreciation	'	12,690,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,348,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,690,000		'	'	'
Southeastern Region | Carrington Hills	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,117,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	2,117,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	33,002,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,706,000		'	'	'
Total Carrying Value	'	35,119,000		'	'	'
Accumulated Depreciation	'	18,870,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,119,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,870,000		'	'	'
Southeastern Region | Brookridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	708,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,461,000		'	'	'
Total Initial Acquisition Costs	'	6,169,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,311,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,118,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,362,000		'	'	'
Total Carrying Value	'	10,480,000		'	'	'
Accumulated Depreciation	'	6,288,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,480,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,288,000		'	'	'
Southeastern Region | Breckenridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	766,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,714,000		'	'	'
Total Initial Acquisition Costs	'	8,480,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,093,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,222,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,351,000		'	'	'
Total Carrying Value	'	12,573,000		'	'	'
Accumulated Depreciation	'	7,249,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,573,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,249,000		'	'	'
Southeastern Region | Colonnade	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,460,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,015,000		'	'	'
Total Initial Acquisition Costs	'	17,475,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,432,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,868,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,039,000		'	'	'
Total Carrying Value	'	21,907,000		'	'	'
Accumulated Depreciation	'	10,699,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	21,907,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,699,000		'	'	'
Southeastern Region | The Preserve at Brentwood	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	22,527,000		'	'	'
Initial Costs, Land and Land Improvements	'	3,182,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,674,000		'	'	'
Total Initial Acquisition Costs	'	27,856,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,693,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,483,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,066,000		'	'	'
Total Carrying Value	'	33,549,000		'	'	'
Accumulated Depreciation	'	18,574,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	33,549,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,574,000		'	'	'
Southeastern Region | Polo Park	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,583,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,293,000		'	'	'
Total Initial Acquisition Costs	'	20,876,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,729,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,624,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,981,000		'	'	'
Total Carrying Value	'	36,605,000		'	'	'
Accumulated Depreciation	'	18,530,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	36,605,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,530,000		'	'	'
Southeastern Region | NASHVILLE, TN	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	22,527,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,433,000		'	'	'
Initial Costs, Buildings and Improvements	'	87,608,000		'	'	'
Total Initial Acquisition Costs	'	103,041,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	85,015,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,535,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	166,521,000		'	'	'
Total Carrying Value	'	188,056,000		'	'	'
Accumulated Depreciation	'	103,277,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	188,056,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	103,277,000		'	'	'
Southeastern Region | The Reserve and Park at Riverbridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,968,000		'	'	'
Initial Costs, Buildings and Improvements	'	56,401,000		'	'	'
Total Initial Acquisition Costs	'	72,369,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,637,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,654,000		'	'	'
Total Carrying Value	'	80,005,000		'	'	'
Accumulated Depreciation	'	34,308,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,005,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	34,308,000		'	'	'
Southeastern Region | OTHER FLORIDA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,968,000		'	'	'
Initial Costs, Buildings and Improvements	'	56,401,000		'	'	'
Total Initial Acquisition Costs	'	72,369,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,637,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,654,000		'	'	'
Total Carrying Value	'	80,005,000		'	'	'
Accumulated Depreciation	'	34,308,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,005,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	34,308,000		'	'	'
Northeast Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	277,813,000		'	'	'
Initial Costs, Land and Land Improvements	'	293,247,000		'	'	'
Initial Costs, Buildings and Improvements	'	1,182,479,000		'	'	'
Total Initial Acquisition Costs	'	1,475,726,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	93,405,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	293,853,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,275,278,000		'	'	'
Total Carrying Value	'	1,569,131,000		'	'	'
Accumulated Depreciation	'	179,280,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,569,131,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	179,280,000		'	'	'
Northeast Region | Garrison Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,591,000		'	'	'
Initial Costs, Buildings and Improvements	'	91,027,000		'	'	'
Total Initial Acquisition Costs	'	96,618,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,176,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,603,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	96,191,000		'	'	'
Total Carrying Value	'	101,794,000		'	'	'
Accumulated Depreciation	'	18,059,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	101,794,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,059,000		'	'	'
Northeast Region | Ridge at Blue Hills	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	23,509,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,039,000		'	'	'
Initial Costs, Buildings and Improvements	'	34,869,000		'	'	'
Total Initial Acquisition Costs	'	40,908,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	752,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,078,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	35,582,000		'	'	'
Total Carrying Value	'	41,660,000		'	'	'
Accumulated Depreciation	'	6,867,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	41,660,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,867,000		'	'	'
Northeast Region | Inwood West	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	57,928,000		'	'	'
Initial Costs, Land and Land Improvements	'	20,778,000		'	'	'
Initial Costs, Buildings and Improvements	'	88,096,000		'	'	'
Total Initial Acquisition Costs	'	108,874,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,559,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	20,849,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	90,584,000		'	'	'
Total Carrying Value	'	111,433,000		'	'	'
Accumulated Depreciation	'	14,498,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	111,433,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,498,000		'	'	'
Northeast Region | 14 North	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,961,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,175,000		'	'	'
Total Initial Acquisition Costs	'	62,136,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,827,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	53,969,000		'	'	'
Total Carrying Value	'	64,963,000		'	'	'
Accumulated Depreciation	'	9,118,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	64,963,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,118,000		'	'	'
Northeast Region | BOSTON, MA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	81,437,000		'	'	'
Initial Costs, Land and Land Improvements	'	43,369,000		'	'	'
Initial Costs, Buildings and Improvements	'	265,167,000		'	'	'
Total Initial Acquisition Costs	'	308,536,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,314,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	43,524,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	276,326,000		'	'	'
Total Carrying Value	'	319,850,000		'	'	'
Accumulated Depreciation	'	48,542,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	319,850,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	48,542,000		'	'	'
Northeast Region | 10 Hanover Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	196,376,000		'	'	'
Initial Costs, Land and Land Improvements	'	41,432,000		'	'	'
Initial Costs, Buildings and Improvements	'	218,983,000		'	'	'
Total Initial Acquisition Costs	'	260,415,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,821,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	41,463,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	225,773,000		'	'	'
Total Carrying Value	'	267,236,000		'	'	'
Accumulated Depreciation	'	31,043,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	267,236,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	31,043,000		'	'	'
Northeast Region | 21 Chelsea	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	36,399,000		'	'	'
Initial Costs, Buildings and Improvements	'	107,154,000		'	'	'
Total Initial Acquisition Costs	'	143,553,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,316,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	36,399,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	115,470,000		'	'	'
Total Carrying Value	'	151,869,000		'	'	'
Accumulated Depreciation	'	14,118,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	151,869,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,118,000		'	'	'
Northeast Region | Rivergate	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	114,410,000		'	'	'
Initial Costs, Buildings and Improvements	'	324,920,000		'	'	'
Total Initial Acquisition Costs	'	439,330,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	63,298,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	114,731,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	387,897,000		'	'	'
Total Carrying Value	'	502,628,000		'	'	'
Accumulated Depreciation	'	47,279,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	502,628,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	47,279,000		'	'	'
Northeast Region | 95 Wall Street	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	57,637,000		'	'	'
Initial Costs, Buildings and Improvements	'	266,255,000		'	'	'
Total Initial Acquisition Costs	'	323,892,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,656,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	57,736,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	269,812,000		'	'	'
Total Carrying Value	'	327,548,000		'	'	'
Accumulated Depreciation	'	38,298,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	327,548,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,298,000		'	'	'
Northeast Region | NEW YORK, NY	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	196,376,000		'	'	'
Initial Costs, Land and Land Improvements	'	249,878,000		'	'	'
Initial Costs, Buildings and Improvements	'	917,312,000		'	'	'
Total Initial Acquisition Costs	'	1,167,190,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	82,091,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	250,329,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	998,952,000		'	'	'
Total Carrying Value	'	1,249,281,000		'	'	'
Accumulated Depreciation	'	130,738,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,249,281,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	130,738,000		'	'	'
Southwestern Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	169,129,000		'	'	'
Initial Costs, Land and Land Improvements	'	99,870,000		'	'	'
Initial Costs, Buildings and Improvements	'	257,677,000		'	'	'
Total Initial Acquisition Costs	'	357,547,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	77,463,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	114,734,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	320,276,000		'	'	'
Total Carrying Value	'	435,010,000		'	'	'
Accumulated Depreciation	'	128,099,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	435,010,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	128,099,000		'	'	'
Southwestern Region | THIRTY377	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,660,000		'	'	'
Initial Costs, Land and Land Improvements	'	24,036,000		'	'	'
Initial Costs, Buildings and Improvements	'	32,951,000		'	'	'
Total Initial Acquisition Costs	'	56,987,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,276,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	24,309,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,954,000		'	'	'
Total Carrying Value	'	64,263,000		'	'	'
Accumulated Depreciation	'	19,168,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	64,263,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	19,168,000		'	'	'
Southwestern Region | Legacy Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	72,415,000		'	'	'
Initial Costs, Land and Land Improvements	'	16,882,000		'	'	'
Initial Costs, Buildings and Improvements	'	100,102,000		'	'	'
Total Initial Acquisition Costs	'	116,984,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,685,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	17,101,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	105,568,000		'	'	'
Total Carrying Value	'	122,669,000		'	'	'
Accumulated Depreciation	'	37,798,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	122,669,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	37,798,000		'	'	'
Southwestern Region | Garden Oaks	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,132,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,367,000		'	'	'
Total Initial Acquisition Costs	'	7,499,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,396,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,928,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,967,000		'	'	'
Total Carrying Value	'	8,895,000		'	'	'
Accumulated Depreciation	'	1,638,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	8,895,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,638,000		'	'	'
Southwestern Region | Glenwood	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,903,000		'	'	'
Initial Costs, Buildings and Improvements	'	554,000		'	'	'
Total Initial Acquisition Costs	'	8,457,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,643,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,950,000		'	'	'
Total Carrying Value	'	10,100,000		'	'	'
Accumulated Depreciation	'	1,146,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,100,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,146,000		'	'	'
Southwestern Region | Talisker of Addison	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,440,000		'	'	'
Initial Costs, Buildings and Improvements	'	634,000		'	'	'
Total Initial Acquisition Costs	'	11,074,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,784,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,841,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,017,000		'	'	'
Total Carrying Value	'	12,858,000		'	'	'
Accumulated Depreciation	'	1,593,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,858,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,593,000		'	'	'
Southwestern Region | Springhaven	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,688,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,354,000		'	'	'
Total Initial Acquisition Costs	'	10,042,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,130,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,350,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,822,000		'	'	'
Total Carrying Value	'	11,172,000		'	'	'
Accumulated Depreciation	'	2,004,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	11,172,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	2,004,000		'	'	'
Southwestern Region | Clipper Pointe	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	13,221,000		'	'	'
Initial Costs, Buildings and Improvements	'	2,507,000		'	'	'
Total Initial Acquisition Costs	'	15,728,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,051,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,906,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,873,000		'	'	'
Total Carrying Value	'	17,779,000		'	'	'
Accumulated Depreciation	'	2,345,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	17,779,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	2,345,000		'	'	'
Southwestern Region | Highlands of Preston	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,151,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,168,000		'	'	'
Total Initial Acquisition Costs	'	10,319,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	30,614,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,975,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	34,958,000		'	'	'
Total Carrying Value	'	40,933,000		'	'	'
Accumulated Depreciation	'	22,141,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	40,933,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,141,000		'	'	'
Southwestern Region | DALLAS, TX	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	103,075,000		'	'	'
Initial Costs, Land and Land Improvements	'	83,453,000		'	'	'
Initial Costs, Buildings and Improvements	'	153,637,000		'	'	'
Total Initial Acquisition Costs	'	237,090,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	51,579,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	96,560,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	192,109,000		'	'	'
Total Carrying Value	'	288,669,000		'	'	'
Accumulated Depreciation	'	87,833,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	288,669,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	87,833,000		'	'	'
Southwestern Region | Barton Creek Landing	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,151,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,269,000		'	'	'
Total Initial Acquisition Costs	'	17,420,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	21,900,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,706,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	34,614,000		'	'	'
Total Carrying Value	'	39,320,000		'	'	'
Accumulated Depreciation	'	17,554,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,320,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,554,000		'	'	'
Southwestern Region | Residences at the Domain	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,661,000		'	'	'
Initial Costs, Land and Land Improvements	'	4,034,000		'	'	'
Initial Costs, Buildings and Improvements	'	55,256,000		'	'	'
Total Initial Acquisition Costs	'	59,290,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,199,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	57,292,000		'	'	'
Total Carrying Value	'	61,489,000		'	'	'
Accumulated Depreciation	'	18,502,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,489,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,502,000		'	'	'
Southwestern Region | Red Stone Ranch	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	19,961,000		'	'	'
Initial Costs, Land and Land Improvements	'	5,084,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,646,000		'	'	'
Total Initial Acquisition Costs	'	22,730,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,140,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,114,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,756,000		'	'	'
Total Carrying Value	'	23,870,000		'	'	'
Accumulated Depreciation	'	2,180,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	23,870,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	2,180,000		'	'	'
Southwestern Region | Lakeline Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	15,432,000		'	'	'
Initial Costs, Land and Land Improvements	'	4,148,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,869,000		'	'	'
Total Initial Acquisition Costs	'	21,017,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	645,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,157,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	17,505,000		'	'	'
Total Carrying Value	'	21,662,000		'	'	'
Accumulated Depreciation	'	2,030,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	21,662,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	2,030,000		'	'	'
Southwestern Region | AUSTIN, TX	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	66,054,000		'	'	'
Initial Costs, Land and Land Improvements	'	16,417,000		'	'	'
Initial Costs, Buildings and Improvements	'	104,040,000		'	'	'
Total Initial Acquisition Costs	'	120,457,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	25,884,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	18,174,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	128,167,000		'	'	'
Total Carrying Value	'	146,341,000		'	'	'
Accumulated Depreciation	'	40,266,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	146,341,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	40,266,000		'	'	'
Corporate Joint Venture [Member]	'	'		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Real estate acquired	'	129,437,000		0	0	'
Retirement of fully depreciated assets	'	-356,303,000		0	0	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Accumulated depreciation on retirements of fully depreciated assets	'	($20,662,000)		$0	$0	'
[1]	Includes unallocated accruals and capital expenditures.The aggregate cost for federal income tax purposes was approximately $7.5 billion at December 31, 2013. The estimated depreciable lives for all buildings in the latest Consolidated Statements of Operations are 35 to 55 years.

Schedule_III_Real_Estate_Owned3

Schedule III - Real Estate Owned (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Total Carrying Value	'	$8,207,977,000		$8,055,828,000	$8,074,471,000	$6,881,347,000
Accumulated Depreciation	'	2,208,794,000		1,924,682,000	1,831,727,000	1,638,326,000
Aggregate cost for federal income tax purposes	'	7,500,000,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at beginning of the year	'	8,055,828,000		8,074,471,000	'	6,881,347,000
Real estate acquired	'	0		141,648,000	1,590,514,000	'
Capital expenditures and development	'	452,057,000		422,480,000	189,711,000	'
Real estate sold	-140,000,000	-70,687,000		-559,154,000	-587,101,000	'
Retirement of fully depreciated assets	'	0		-13,945,000	0	'
Hurricane related impairment of assets	'	-2,355,000		-9,672,000	0	'
Balance at end of the year	'	8,207,977,000		8,055,828,000	8,074,471,000	6,881,347,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at beginning of the year	'	1,924,682,000		1,831,727,000	'	1,638,326,000
Depreciation expense for the year	'	339,326,000		340,800,000	341,925,000	'
Accumulated depreciation on sales	'	-34,794,000		-233,207,000	-148,524,000	'
Accumulated depreciation on retirements of fully depreciated asset	'	-1,132,000		-13,945,000	0	'
Write off of accumulated depreciation on hurricane related impaired assets	'	0		-693,000	0	'
Balance at end of year	'	2,208,794,000		1,924,682,000	1,831,727,000	1,638,326,000
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	'	0	[1]	'	'	'
Initial Costs, Land and Land Improvements	'	0	[1]	'	'	'
Initial Costs, Buildings and Improvements	'	0	[1]	'	'	'
Total Initial Acquisition Costs	'	0	[1]	'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,242,000	[1]	'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	0	[1]	'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	3,242,000	[1]	'	'	'
Total Carrying Value	'	3,242,000	[1]	'	'	'
Accumulated Depreciation	'	25,000	[1]	'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	3,242,000	[1]	'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,000	[1]	'	'	'
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	'	3,242,000		'	'	'
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	'	3,242,000		'	'	'
Total Carrying Value	'	3,242,000		'	'	'
Accumulated Depreciation	'	25,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	3,242,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,000		'	'	'
Real Estate Under Development	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	28,816,000		'	'	'
Initial Costs, Land and Land Improvements	'	85,982,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,786,000		'	'	'
Total Initial Acquisition Costs	'	98,768,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	368,645,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	94,383,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	373,030,000		'	'	'
Total Carrying Value	'	467,413,000		'	'	'
Accumulated Depreciation	'	1,411,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	467,413,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,411,000		'	'	'
Real Estate Under Development | DelRey Tower [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	297,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,786,000		'	'	'
Total Initial Acquisition Costs	'	13,083,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	66,980,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,447,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	70,616,000		'	'	'
Total Carrying Value	'	80,063,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,063,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Real Estate Under Development | Los Alisos	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	17,298,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	17,298,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	63,325,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,386,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	64,237,000		'	'	'
Total Carrying Value	'	80,623,000		'	'	'
Accumulated Depreciation	'	300,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,623,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	300,000		'	'	'
Land	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	48,096,000		'	'	'
Initial Costs, Buildings and Improvements	'	2,768,000		'	'	'
Total Initial Acquisition Costs	'	50,864,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	22,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	54,492,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	18,785,000		'	'	'
Total Carrying Value	'	73,277,000		'	'	'
Accumulated Depreciation	'	3,445,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	73,277,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	3,445,000		'	'	'
Land | Presidio	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,524,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	1,524,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	921,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,300,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,145,000		'	'	'
Total Carrying Value	'	2,445,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	2,445,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
Commercial Held for Development	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	32,351,000		'	'	'
Initial Costs, Buildings and Improvements	'	19,108,000		'	'	'
Total Initial Acquisition Costs	'	51,459,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,281,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	40,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	22,543,000		'	'	'
Total Carrying Value	'	62,740,000		'	'	'
Accumulated Depreciation	'	9,119,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	62,740,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,119,000		'	'	'
Commercial Held for Development | TOTAL COMMERCIAL & CORPORATE	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	32,351,000		'	'	'
Initial Costs, Buildings and Improvements	'	19,108,000		'	'	'
Total Initial Acquisition Costs	'	51,459,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	14,523,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	40,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	25,785,000		'	'	'
Total Carrying Value	'	65,982,000		'	'	'
Accumulated Depreciation	'	9,144,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	65,982,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,144,000		'	'	'
Commercial Held for Development | Total Real Estate Owned	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	1,442,077,000		'	'	'
Initial Costs, Land and Land Improvements	'	1,737,466,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,323,367,000		'	'	'
Total Initial Acquisition Costs	'	6,060,833,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,147,143,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,952,265,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	6,255,712,000		'	'	'
Total Carrying Value	'	8,207,977,000		'	'	'
Accumulated Depreciation	'	2,208,794,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	8,207,977,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	2,208,794,000		'	'	'
Western Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	540,983,000		'	'	'
Initial Costs, Land and Land Improvements	'	834,196,000		'	'	'
Initial Costs, Buildings and Improvements	'	1,495,623,000		'	'	'
Total Initial Acquisition Costs	'	2,329,819,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	804,057,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	904,701,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	2,229,175,000		'	'	'
Total Carrying Value	'	3,133,876,000		'	'	'
Accumulated Depreciation	'	844,928,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	3,133,876,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	844,928,000		'	'	'
Western Region | Harbor at Mesa Verde	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	50,358,000		'	'	'
Initial Costs, Land and Land Improvements	'	20,476,000		'	'	'
Initial Costs, Buildings and Improvements	'	28,538,000		'	'	'
Total Initial Acquisition Costs	'	49,014,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	12,291,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	20,963,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	40,342,000		'	'	'
Total Carrying Value	'	61,305,000		'	'	'
Accumulated Depreciation	'	24,805,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,305,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,805,000		'	'	'
Western Region | 27 Seventy FIve Mesa Verde [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,660,000		'	'	'
Initial Costs, Land and Land Improvements	'	99,329,000		'	'	'
Initial Costs, Buildings and Improvements	'	110,644,000		'	'	'
Total Initial Acquisition Costs	'	209,973,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	83,889,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	107,578,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	186,284,000		'	'	'
Total Carrying Value	'	293,862,000		'	'	'
Accumulated Depreciation	'	57,965,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	293,862,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	57,965,000		'	'	'
Western Region | Pacific Shores	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	34,112,000		'	'	'
Initial Costs, Land and Land Improvements	'	7,345,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,624,000		'	'	'
Total Initial Acquisition Costs	'	29,969,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	31,056,000		'	'	'
Total Carrying Value	'	38,777,000		'	'	'
Accumulated Depreciation	'	18,492,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,777,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,492,000		'	'	'
Western Region | Huntington Vista	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	27,972,000		'	'	'
Initial Costs, Land and Land Improvements	'	8,055,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,486,000		'	'	'
Total Initial Acquisition Costs	'	30,541,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,972,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,312,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,201,000		'	'	'
Total Carrying Value	'	37,513,000		'	'	'
Accumulated Depreciation	'	17,615,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	37,513,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,615,000		'	'	'
Western Region | Missions at Back Bay	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	229,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,129,000		'	'	'
Total Initial Acquisition Costs	'	14,358,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,045,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,778,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	5,625,000		'	'	'
Total Carrying Value	'	16,403,000		'	'	'
Accumulated Depreciation	'	3,772,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,403,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	3,772,000		'	'	'
Western Region | Coronado at Newport b North	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	62,516,000		'	'	'
Initial Costs, Buildings and Improvements	'	46,082,000		'	'	'
Total Initial Acquisition Costs	'	108,598,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	23,596,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	66,683,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	65,511,000		'	'	'
Total Carrying Value	'	132,194,000		'	'	'
Accumulated Depreciation	'	38,108,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	132,194,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,108,000		'	'	'
Western Region | Huntington Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	50,771,000		'	'	'
Initial Costs, Land and Land Improvements	'	61,535,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,017,000		'	'	'
Total Initial Acquisition Costs	'	79,552,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,378,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	62,096,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	23,834,000		'	'	'
Total Carrying Value	'	85,930,000		'	'	'
Accumulated Depreciation	'	14,471,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	85,930,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,471,000		'	'	'
Western Region | Vista Del Rey	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,670,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,080,000		'	'	'
Total Initial Acquisition Costs	'	17,750,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,908,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,819,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,839,000		'	'	'
Total Carrying Value	'	19,658,000		'	'	'
Accumulated Depreciation	'	5,270,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,658,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	5,270,000		'	'	'
Western Region | Coronado South	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	58,785,000		'	'	'
Initial Costs, Buildings and Improvements	'	50,067,000		'	'	'
Total Initial Acquisition Costs	'	108,852,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,881,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	59,183,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	66,550,000		'	'	'
Total Carrying Value	'	125,733,000		'	'	'
Accumulated Depreciation	'	36,990,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	125,733,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	36,990,000		'	'	'
Western Region | ORANGE COUNTY, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	193,873,000		'	'	'
Initial Costs, Land and Land Improvements	'	382,674,000		'	'	'
Initial Costs, Buildings and Improvements	'	377,759,000		'	'	'
Total Initial Acquisition Costs	'	760,433,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	287,747,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	408,191,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	639,989,000		'	'	'
Total Carrying Value	'	1,048,180,000		'	'	'
Accumulated Depreciation	'	235,713,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,048,180,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	235,713,000		'	'	'
Western Region | 2000 Post Street	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	9,861,000		'	'	'
Initial Costs, Buildings and Improvements	'	44,578,000		'	'	'
Total Initial Acquisition Costs	'	54,439,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,254,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,221,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	51,472,000		'	'	'
Total Carrying Value	'	61,693,000		'	'	'
Accumulated Depreciation	'	22,853,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,693,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,853,000		'	'	'
Western Region | Birch Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,365,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,696,000		'	'	'
Total Initial Acquisition Costs	'	21,061,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,026,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	22,185,000		'	'	'
Total Carrying Value	'	27,211,000		'	'	'
Accumulated Depreciation	'	12,068,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,211,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,068,000		'	'	'
Western Region | Highlands Of Marin	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,996,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,868,000		'	'	'
Total Initial Acquisition Costs	'	30,864,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	25,534,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,095,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	49,303,000		'	'	'
Total Carrying Value	'	56,398,000		'	'	'
Accumulated Depreciation	'	23,816,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	56,398,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,816,000		'	'	'
Western Region | Marina Playa	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,224,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,916,000		'	'	'
Total Initial Acquisition Costs	'	30,140,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,811,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,886,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,065,000		'	'	'
Total Carrying Value	'	38,951,000		'	'	'
Accumulated Depreciation	'	17,166,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,951,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,166,000		'	'	'
Western Region | The Westerly	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	67,700,000		'	'	'
Initial Costs, Land and Land Improvements	'	48,182,000		'	'	'
Initial Costs, Buildings and Improvements	'	102,364,000		'	'	'
Total Initial Acquisition Costs	'	150,546,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	35,475,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	50,594,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	135,427,000		'	'	'
Total Carrying Value	'	186,021,000		'	'	'
Accumulated Depreciation	'	24,613,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	186,021,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,613,000		'	'	'
Western Region | River Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	33,130,000		'	'	'
Initial Costs, Land and Land Improvements	'	22,161,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,137,000		'	'	'
Total Initial Acquisition Costs	'	62,298,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,851,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,308,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	42,841,000		'	'	'
Total Carrying Value	'	65,149,000		'	'	'
Accumulated Depreciation	'	21,251,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	65,149,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,251,000		'	'	'
Western Region | CitySouth	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	14,031,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,537,000		'	'	'
Total Initial Acquisition Costs	'	44,568,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	35,031,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,220,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,379,000		'	'	'
Total Carrying Value	'	79,599,000		'	'	'
Accumulated Depreciation	'	25,108,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	79,599,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,108,000		'	'	'
Western Region | Bay Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,545,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,458,000		'	'	'
Total Initial Acquisition Costs	'	23,003,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,357,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,947,000		'	'	'
Total Carrying Value	'	27,360,000		'	'	'
Accumulated Depreciation	'	7,730,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,360,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,730,000		'	'	'
Western Region | Highlands of Marin Phase II	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,353,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,559,000		'	'	'
Total Initial Acquisition Costs	'	23,912,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,038,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,753,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,197,000		'	'	'
Total Carrying Value	'	34,950,000		'	'	'
Accumulated Depreciation	'	11,297,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	34,950,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,297,000		'	'	'
Western Region | Edgewater	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	30,657,000		'	'	'
Initial Costs, Buildings and Improvements	'	83,872,000		'	'	'
Total Initial Acquisition Costs	'	114,529,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,861,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	30,675,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	86,715,000		'	'	'
Total Carrying Value	'	117,390,000		'	'	'
Accumulated Depreciation	'	29,050,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	117,390,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,050,000		'	'	'
Western Region | Almaden Lake Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	27,000,000		'	'	'
Initial Costs, Land and Land Improvements	'	594,000		'	'	'
Initial Costs, Buildings and Improvements	'	42,515,000		'	'	'
Total Initial Acquisition Costs	'	43,109,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,367,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	729,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	46,747,000		'	'	'
Total Carrying Value	'	47,476,000		'	'	'
Accumulated Depreciation	'	15,391,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	47,476,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,391,000		'	'	'
Western Region | SAN FRANCISCO, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	60,130,000		'	'	'
Initial Costs, Land and Land Improvements	'	123,796,000		'	'	'
Initial Costs, Buildings and Improvements	'	421,993,000		'	'	'
Total Initial Acquisition Costs	'	545,789,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	115,091,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	133,891,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	526,989,000		'	'	'
Total Carrying Value	'	660,880,000		'	'	'
Accumulated Depreciation	'	202,383,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	660,880,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	202,383,000		'	'	'
Western Region | Rosebeach	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,414,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,449,000		'	'	'
Total Initial Acquisition Costs	'	25,863,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,664,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,558,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	19,969,000		'	'	'
Total Carrying Value	'	28,527,000		'	'	'
Accumulated Depreciation	'	10,949,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	28,527,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,949,000		'	'	'
Western Region | Ocean Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,135,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,789,000		'	'	'
Total Initial Acquisition Costs	'	17,924,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,671,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,245,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,350,000		'	'	'
Total Carrying Value	'	19,595,000		'	'	'
Accumulated Depreciation	'	7,652,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,595,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,652,000		'	'	'
Western Region | Tierra Del Rey	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	32,635,000		'	'	'
Initial Costs, Land and Land Improvements	'	39,586,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,679,000		'	'	'
Total Initial Acquisition Costs	'	76,265,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,584,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	39,646,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,203,000		'	'	'
Total Carrying Value	'	78,849,000		'	'	'
Accumulated Depreciation	'	14,238,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	78,849,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,238,000		'	'	'
Western Region | LOS ANGELES, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	100,335,000		'	'	'
Initial Costs, Land and Land Improvements	'	162,773,000		'	'	'
Initial Costs, Buildings and Improvements	'	175,586,000		'	'	'
Total Initial Acquisition Costs	'	338,359,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	143,812,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	171,483,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	310,688,000		'	'	'
Total Carrying Value	'	482,171,000		'	'	'
Accumulated Depreciation	'	95,488,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	482,171,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	95,488,000		'	'	'
Western Region | Crowne Pointe	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,486,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,437,000		'	'	'
Total Initial Acquisition Costs	'	8,923,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,827,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,942,000		'	'	'
Total Carrying Value	'	13,750,000		'	'	'
Accumulated Depreciation	'	6,580,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,750,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,580,000		'	'	'
Western Region | Hilltop	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,174,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,408,000		'	'	'
Total Initial Acquisition Costs	'	9,582,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,432,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,658,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,356,000		'	'	'
Total Carrying Value	'	13,014,000		'	'	'
Accumulated Depreciation	'	6,008,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,014,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,008,000		'	'	'
Western Region | The Kennedy	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,179,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,307,000		'	'	'
Total Initial Acquisition Costs	'	28,486,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,593,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,232,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	23,847,000		'	'	'
Total Carrying Value	'	30,079,000		'	'	'
Accumulated Depreciation	'	11,244,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	30,079,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,244,000		'	'	'
Western Region | Hearthstone at Merrill Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	23,341,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,848,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,922,000		'	'	'
Total Initial Acquisition Costs	'	37,770,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,407,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,957,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	33,220,000		'	'	'
Total Carrying Value	'	40,177,000		'	'	'
Accumulated Depreciation	'	11,289,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	40,177,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,289,000		'	'	'
Western Region | Island Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	21,284,000		'	'	'
Initial Costs, Buildings and Improvements	'	89,389,000		'	'	'
Total Initial Acquisition Costs	'	110,673,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,318,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,401,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	92,590,000		'	'	'
Total Carrying Value	'	113,991,000		'	'	'
Accumulated Depreciation	'	29,209,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	113,991,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,209,000		'	'	'
Western Region | SEATTLE, WA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	70,253,000		'	'	'
Initial Costs, Land and Land Improvements	'	90,464,000		'	'	'
Initial Costs, Buildings and Improvements	'	350,395,000		'	'	'
Total Initial Acquisition Costs	'	440,859,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	39,238,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	94,886,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	385,211,000		'	'	'
Total Carrying Value	'	480,097,000		'	'	'
Accumulated Depreciation	'	142,666,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	480,097,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	142,666,000		'	'	'
Western Region | Presidio at Rancho Del Oro	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	9,164,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,694,000		'	'	'
Total Initial Acquisition Costs	'	31,858,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,270,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,722,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	28,406,000		'	'	'
Total Carrying Value	'	38,128,000		'	'	'
Accumulated Depreciation	'	16,802,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,128,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	16,802,000		'	'	'
Western Region | Villas at Carlsbad	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,517,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,718,000		'	'	'
Total Initial Acquisition Costs	'	17,235,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,059,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,722,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	12,572,000		'	'	'
Total Carrying Value	'	19,294,000		'	'	'
Accumulated Depreciation	'	6,607,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,294,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,607,000		'	'	'
Western Region | SAN DIEGO, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	34,780,000		'	'	'
Initial Costs, Land and Land Improvements	'	25,981,000		'	'	'
Initial Costs, Buildings and Improvements	'	33,412,000		'	'	'
Total Initial Acquisition Costs	'	59,393,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	69,176,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	26,749,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	101,820,000		'	'	'
Total Carrying Value	'	128,569,000		'	'	'
Accumulated Depreciation	'	24,037,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	128,569,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,037,000		'	'	'
Western Region | Boronda Manor	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,946,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,982,000		'	'	'
Total Initial Acquisition Costs	'	10,928,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,126,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,145,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,909,000		'	'	'
Total Carrying Value	'	20,054,000		'	'	'
Accumulated Depreciation	'	7,952,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	20,054,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,952,000		'	'	'
Western Region | Garden Court	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	888,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,188,000		'	'	'
Total Initial Acquisition Costs	'	5,076,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,123,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,491,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,708,000		'	'	'
Total Carrying Value	'	10,199,000		'	'	'
Accumulated Depreciation	'	4,203,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,199,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,203,000		'	'	'
Western Region | Cambridge Court	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,039,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,883,000		'	'	'
Total Initial Acquisition Costs	'	15,922,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,910,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,635,000		'	'	'
Total Carrying Value	'	29,832,000		'	'	'
Accumulated Depreciation	'	12,143,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	29,832,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,143,000		'	'	'
Western Region | Laurel Tree	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,304,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,115,000		'	'	'
Total Initial Acquisition Costs	'	6,419,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,577,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,131,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,865,000		'	'	'
Total Carrying Value	'	11,996,000		'	'	'
Accumulated Depreciation	'	4,904,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	11,996,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,904,000		'	'	'
Western Region | The Pointe At Harden Ranch	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,388,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,854,000		'	'	'
Total Initial Acquisition Costs	'	30,242,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	24,885,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,816,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	45,311,000		'	'	'
Total Carrying Value	'	55,127,000		'	'	'
Accumulated Depreciation	'	21,627,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	55,127,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,627,000		'	'	'
Western Region | The Pointe At Northridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,044,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,028,000		'	'	'
Total Initial Acquisition Costs	'	10,072,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,451,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,242,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,281,000		'	'	'
Total Carrying Value	'	19,523,000		'	'	'
Accumulated Depreciation	'	8,239,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,523,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,239,000		'	'	'
Western Region | The Pointe At Westlake	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,329,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,334,000		'	'	'
Total Initial Acquisition Costs	'	6,663,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,883,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,129,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,417,000		'	'	'
Total Carrying Value	'	12,546,000		'	'	'
Accumulated Depreciation	'	4,854,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,546,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,854,000		'	'	'
Western Region | MONTEREY PENINSULA, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	16,938,000		'	'	'
Initial Costs, Buildings and Improvements	'	68,384,000		'	'	'
Total Initial Acquisition Costs	'	85,322,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	73,955,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	27,151,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	132,126,000		'	'	'
Total Carrying Value	'	159,277,000		'	'	'
Accumulated Depreciation	'	63,922,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	159,277,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	63,922,000		'	'	'
Western Region | Verano at Rancho Cucamonga Town Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,471,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,557,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,645,000		'	'	'
Total Initial Acquisition Costs	'	17,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	52,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,995,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	47,201,000		'	'	'
Total Carrying Value	'	70,196,000		'	'	'
Accumulated Depreciation	'	28,367,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	70,196,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	28,367,000		'	'	'
Western Region | INLAND EMPIRE, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,471,000		'	'	'
Initial Costs, Land and Land Improvements	'	19,367,000		'	'	'
Initial Costs, Buildings and Improvements	'	27,095,000		'	'	'
Total Initial Acquisition Costs	'	46,462,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	55,431,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	29,036,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	72,857,000		'	'	'
Total Carrying Value	'	101,893,000		'	'	'
Accumulated Depreciation	'	44,365,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	101,893,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	44,365,000		'	'	'
Western Region | Tualatin Heights	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,273,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,134,000		'	'	'
Total Initial Acquisition Costs	'	12,407,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,204,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,813,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,798,000		'	'	'
Total Carrying Value	'	18,611,000		'	'	'
Accumulated Depreciation	'	9,082,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	18,611,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,082,000		'	'	'
Western Region | Andover Park	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	16,818,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,916,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,995,000		'	'	'
Total Initial Acquisition Costs	'	19,911,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,783,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,544,000		'	'	'
Total Carrying Value	'	27,694,000		'	'	'
Accumulated Depreciation	'	14,770,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,694,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,770,000		'	'	'
Western Region | Hunt Club	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,323,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,014,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,870,000		'	'	'
Total Initial Acquisition Costs	'	20,884,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,620,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,153,000		'	'	'
Total Carrying Value	'	26,504,000		'	'	'
Accumulated Depreciation	'	12,502,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,504,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,502,000		'	'	'
Western Region | PORTLAND, OR	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	35,141,000		'	'	'
Initial Costs, Land and Land Improvements	'	12,203,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,999,000		'	'	'
Total Initial Acquisition Costs	'	53,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,607,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	13,314,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	59,495,000		'	'	'
Total Carrying Value	'	72,809,000		'	'	'
Accumulated Depreciation	'	36,354,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	72,809,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	36,354,000		'	'	'
Mid Atlantic Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	263,749,000		'	'	'
Initial Costs, Land and Land Improvements	'	216,901,000		'	'	'
Initial Costs, Buildings and Improvements	'	890,259,000		'	'	'
Total Initial Acquisition Costs	'	1,107,160,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	449,654,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	286,227,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,270,587,000		'	'	'
Total Carrying Value	'	1,556,814,000		'	'	'
Accumulated Depreciation	'	577,998,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,556,814,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	577,998,000		'	'	'
Mid Atlantic Region | The Whitmore	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,418,000		'	'	'
Initial Costs, Buildings and Improvements	'	13,411,000		'	'	'
Total Initial Acquisition Costs	'	19,829,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,931,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,460,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,300,000		'	'	'
Total Carrying Value	'	39,760,000		'	'	'
Accumulated Depreciation	'	20,140,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,760,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	20,140,000		'	'	'
Mid Atlantic Region | Ridgewood	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,612,000		'	'	'
Initial Costs, Buildings and Improvements	'	20,086,000		'	'	'
Total Initial Acquisition Costs	'	25,698,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,864,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,986,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	27,576,000		'	'	'
Total Carrying Value	'	33,562,000		'	'	'
Accumulated Depreciation	'	18,660,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	33,562,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,660,000		'	'	'
Mid Atlantic Region | Wellington Place at Olde Town	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	28,681,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,753,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,059,000		'	'	'
Total Initial Acquisition Costs	'	49,812,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,856,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,629,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	52,039,000		'	'	'
Total Carrying Value	'	66,668,000		'	'	'
Accumulated Depreciation	'	29,361,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	66,668,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,361,000		'	'	'
Mid Atlantic Region | Andover House	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	14,357,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,577,000		'	'	'
Total Initial Acquisition Costs	'	65,934,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,755,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,373,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	54,316,000		'	'	'
Total Carrying Value	'	68,689,000		'	'	'
Accumulated Depreciation	'	21,542,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	68,689,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,542,000		'	'	'
Mid Atlantic Region | Sullivan Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,137,000		'	'	'
Initial Costs, Buildings and Improvements	'	103,676,000		'	'	'
Total Initial Acquisition Costs	'	104,813,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,352,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,235,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	107,930,000		'	'	'
Total Carrying Value	'	109,165,000		'	'	'
Accumulated Depreciation	'	38,559,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	109,165,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,559,000		'	'	'
Mid Atlantic Region | Circle Towers	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	70,328,000		'	'	'
Initial Costs, Land and Land Improvements	'	32,815,000		'	'	'
Initial Costs, Buildings and Improvements	'	107,051,000		'	'	'
Total Initial Acquisition Costs	'	139,866,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,199,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	32,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	116,071,000		'	'	'
Total Carrying Value	'	149,065,000		'	'	'
Accumulated Depreciation	'	37,847,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	149,065,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	37,847,000		'	'	'
Mid Atlantic Region | Delancey at Shirlington	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	21,606,000		'	'	'
Initial Costs, Buildings and Improvements	'	66,765,000		'	'	'
Total Initial Acquisition Costs	'	88,371,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,441,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,621,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	68,191,000		'	'	'
Total Carrying Value	'	89,812,000		'	'	'
Accumulated Depreciation	'	22,662,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	89,812,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,662,000		'	'	'
Mid Atlantic Region | METROPOLITAN DC	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	150,038,000		'	'	'
Initial Costs, Land and Land Improvements	'	164,145,000		'	'	'
Initial Costs, Buildings and Improvements	'	586,683,000		'	'	'
Total Initial Acquisition Costs	'	750,828,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	260,228,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	214,933,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	796,123,000		'	'	'
Total Carrying Value	'	1,011,056,000		'	'	'
Accumulated Depreciation	'	282,484,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,011,056,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	282,484,000		'	'	'
Mid Atlantic Region | Lakeside Mill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	15,242,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,666,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,109,000		'	'	'
Total Initial Acquisition Costs	'	12,775,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,189,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,919,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,045,000		'	'	'
Total Carrying Value	'	16,964,000		'	'	'
Accumulated Depreciation	'	10,290,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,964,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,290,000		'	'	'
Mid Atlantic Region | Tamar Meadow	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,145,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,150,000		'	'	'
Total Initial Acquisition Costs	'	21,295,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,707,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,559,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	21,443,000		'	'	'
Total Carrying Value	'	26,002,000		'	'	'
Accumulated Depreciation	'	14,199,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,002,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,199,000		'	'	'
Mid Atlantic Region | Calvertbs Walk	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,408,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,692,000		'	'	'
Total Initial Acquisition Costs	'	29,100,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,436,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,660,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,876,000		'	'	'
Total Carrying Value	'	35,536,000		'	'	'
Accumulated Depreciation	'	18,463,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,536,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,463,000		'	'	'
Mid Atlantic Region | Liriope Apartments	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,620,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,791,000		'	'	'
Total Initial Acquisition Costs	'	8,411,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,149,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,646,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	7,914,000		'	'	'
Total Carrying Value	'	9,560,000		'	'	'
Accumulated Depreciation	'	4,770,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	9,560,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,770,000		'	'	'
Mid Atlantic Region | 20 Lambourne	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	31,511,000		'	'	'
Initial Costs, Land and Land Improvements	'	11,750,000		'	'	'
Initial Costs, Buildings and Improvements	'	45,590,000		'	'	'
Total Initial Acquisition Costs	'	57,340,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,481,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,990,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	49,831,000		'	'	'
Total Carrying Value	'	61,821,000		'	'	'
Accumulated Depreciation	'	18,123,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,821,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,123,000		'	'	'
Mid Atlantic Region | BALTIMORE, MD	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	72,204,000		'	'	'
Initial Costs, Land and Land Improvements	'	41,660,000		'	'	'
Initial Costs, Buildings and Improvements	'	199,073,000		'	'	'
Total Initial Acquisition Costs	'	240,733,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	65,425,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	46,846,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	259,312,000		'	'	'
Total Carrying Value	'	306,158,000		'	'	'
Accumulated Depreciation	'	138,558,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	306,158,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	138,558,000		'	'	'
Southeastern Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	161,587,000		'	'	'
Initial Costs, Land and Land Improvements	'	119,557,000		'	'	'
Initial Costs, Buildings and Improvements	'	452,965,000		'	'	'
Total Initial Acquisition Costs	'	572,522,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	317,232,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	152,927,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	736,827,000		'	'	'
Total Carrying Value	'	889,754,000		'	'	'
Accumulated Depreciation	'	457,921,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	889,754,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	457,921,000		'	'	'
Southeastern Region | Sugar Mill Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,242,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,553,000		'	'	'
Total Initial Acquisition Costs	'	9,795,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,567,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,720,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,642,000		'	'	'
Total Carrying Value	'	16,362,000		'	'	'
Accumulated Depreciation	'	8,401,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,362,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,401,000		'	'	'
Southeastern Region | Inlet Bay	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,702,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,150,000		'	'	'
Total Initial Acquisition Costs	'	30,852,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,740,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,005,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	35,587,000		'	'	'
Total Carrying Value	'	44,592,000		'	'	'
Accumulated Depreciation	'	24,223,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	44,592,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,223,000		'	'	'
Southeastern Region | MacAlpine Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,869,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,858,000		'	'	'
Total Initial Acquisition Costs	'	47,727,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,862,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,264,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	43,325,000		'	'	'
Total Carrying Value	'	54,589,000		'	'	'
Accumulated Depreciation	'	24,392,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	54,589,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,392,000		'	'	'
Southeastern Region | TAMPA, FL	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,835,000		'	'	'
Initial Costs, Land and Land Improvements	'	50,465,000		'	'	'
Initial Costs, Buildings and Improvements	'	176,592,000		'	'	'
Total Initial Acquisition Costs	'	227,057,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	108,616,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	67,279,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	268,395,000		'	'	'
Total Carrying Value	'	335,674,000		'	'	'
Accumulated Depreciation	'	162,117,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	335,674,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	162,117,000		'	'	'
Southeastern Region | Legacy Hill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,148,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,867,000		'	'	'
Total Initial Acquisition Costs	'	7,015,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,460,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,754,000		'	'	'
Total Carrying Value	'	15,475,000		'	'	'
Accumulated Depreciation	'	10,377,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	15,475,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,377,000		'	'	'
Southeastern Region | Hickory Run	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,469,000		'	'	'
Initial Costs, Buildings and Improvements	'	11,584,000		'	'	'
Total Initial Acquisition Costs	'	13,053,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,295,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,086,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,262,000		'	'	'
Total Carrying Value	'	22,348,000		'	'	'
Accumulated Depreciation	'	12,690,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,348,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,690,000		'	'	'
Southeastern Region | Carrington Hills	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,117,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	2,117,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	33,002,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,706,000		'	'	'
Total Carrying Value	'	35,119,000		'	'	'
Accumulated Depreciation	'	18,870,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,119,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,870,000		'	'	'
Southeastern Region | Brookridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	708,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,461,000		'	'	'
Total Initial Acquisition Costs	'	6,169,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,311,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,118,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,362,000		'	'	'
Total Carrying Value	'	10,480,000		'	'	'
Accumulated Depreciation	'	6,288,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,480,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,288,000		'	'	'
Southeastern Region | Breckenridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	766,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,714,000		'	'	'
Total Initial Acquisition Costs	'	8,480,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,093,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,222,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,351,000		'	'	'
Total Carrying Value	'	12,573,000		'	'	'
Accumulated Depreciation	'	7,249,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,573,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,249,000		'	'	'
Southeastern Region | Polo Park	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,583,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,293,000		'	'	'
Total Initial Acquisition Costs	'	20,876,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,729,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,624,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,981,000		'	'	'
Total Carrying Value	'	36,605,000		'	'	'
Accumulated Depreciation	'	18,530,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	36,605,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,530,000		'	'	'
Southeastern Region | NASHVILLE, TN	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	22,527,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,433,000		'	'	'
Initial Costs, Buildings and Improvements	'	87,608,000		'	'	'
Total Initial Acquisition Costs	'	103,041,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	85,015,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,535,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	166,521,000		'	'	'
Total Carrying Value	'	188,056,000		'	'	'
Accumulated Depreciation	'	103,277,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	188,056,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	103,277,000		'	'	'
Southeastern Region | The Reserve and Park at Riverbridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,968,000		'	'	'
Initial Costs, Buildings and Improvements	'	56,401,000		'	'	'
Total Initial Acquisition Costs	'	72,369,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,637,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,654,000		'	'	'
Total Carrying Value	'	80,005,000		'	'	'
Accumulated Depreciation	'	34,308,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,005,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	34,308,000		'	'	'
Southeastern Region | OTHER FLORIDA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,968,000		'	'	'
Initial Costs, Buildings and Improvements	'	56,401,000		'	'	'
Total Initial Acquisition Costs	'	72,369,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,637,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,654,000		'	'	'
Total Carrying Value	'	80,005,000		'	'	'
Accumulated Depreciation	'	34,308,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,005,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	34,308,000		'	'	'
Northeast Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	277,813,000		'	'	'
Initial Costs, Land and Land Improvements	'	293,247,000		'	'	'
Initial Costs, Buildings and Improvements	'	1,182,479,000		'	'	'
Total Initial Acquisition Costs	'	1,475,726,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	93,405,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	293,853,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,275,278,000		'	'	'
Total Carrying Value	'	1,569,131,000		'	'	'
Accumulated Depreciation	'	179,280,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,569,131,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	179,280,000		'	'	'
Northeast Region | Inwood West	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	57,928,000		'	'	'
Initial Costs, Land and Land Improvements	'	20,778,000		'	'	'
Initial Costs, Buildings and Improvements	'	88,096,000		'	'	'
Total Initial Acquisition Costs	'	108,874,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,559,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	20,849,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	90,584,000		'	'	'
Total Carrying Value	'	111,433,000		'	'	'
Accumulated Depreciation	'	14,498,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	111,433,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,498,000		'	'	'
Northeast Region | 14 North	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,961,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,175,000		'	'	'
Total Initial Acquisition Costs	'	62,136,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,827,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	53,969,000		'	'	'
Total Carrying Value	'	64,963,000		'	'	'
Accumulated Depreciation	'	9,118,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	64,963,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,118,000		'	'	'
Northeast Region | BOSTON, MA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	81,437,000		'	'	'
Initial Costs, Land and Land Improvements	'	43,369,000		'	'	'
Initial Costs, Buildings and Improvements	'	265,167,000		'	'	'
Total Initial Acquisition Costs	'	308,536,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,314,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	43,524,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	276,326,000		'	'	'
Total Carrying Value	'	319,850,000		'	'	'
Accumulated Depreciation	'	48,542,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	319,850,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	48,542,000		'	'	'
Northeast Region | 10 Hanover Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	196,376,000		'	'	'
Initial Costs, Land and Land Improvements	'	41,432,000		'	'	'
Initial Costs, Buildings and Improvements	'	218,983,000		'	'	'
Total Initial Acquisition Costs	'	260,415,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,821,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	41,463,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	225,773,000		'	'	'
Total Carrying Value	'	267,236,000		'	'	'
Accumulated Depreciation	'	31,043,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	267,236,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	31,043,000		'	'	'
Northeast Region | 95 Wall Street	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	57,637,000		'	'	'
Initial Costs, Buildings and Improvements	'	266,255,000		'	'	'
Total Initial Acquisition Costs	'	323,892,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,656,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	57,736,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	269,812,000		'	'	'
Total Carrying Value	'	327,548,000		'	'	'
Accumulated Depreciation	'	38,298,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	327,548,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,298,000		'	'	'
Northeast Region | NEW YORK, NY	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	196,376,000		'	'	'
Initial Costs, Land and Land Improvements	'	249,878,000		'	'	'
Initial Costs, Buildings and Improvements	'	917,312,000		'	'	'
Total Initial Acquisition Costs	'	1,167,190,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	82,091,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	250,329,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	998,952,000		'	'	'
Total Carrying Value	'	1,249,281,000		'	'	'
Accumulated Depreciation	'	130,738,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,249,281,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	130,738,000		'	'	'
Southwestern Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	169,129,000		'	'	'
Initial Costs, Land and Land Improvements	'	99,870,000		'	'	'
Initial Costs, Buildings and Improvements	'	257,677,000		'	'	'
Total Initial Acquisition Costs	'	357,547,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	77,463,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	114,734,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	320,276,000		'	'	'
Total Carrying Value	'	435,010,000		'	'	'
Accumulated Depreciation	'	128,099,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	435,010,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	128,099,000		'	'	'
Southwestern Region | THIRTY377	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,660,000		'	'	'
Initial Costs, Land and Land Improvements	'	24,036,000		'	'	'
Initial Costs, Buildings and Improvements	'	32,951,000		'	'	'
Total Initial Acquisition Costs	'	56,987,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,276,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	24,309,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,954,000		'	'	'
Total Carrying Value	'	64,263,000		'	'	'
Accumulated Depreciation	'	19,168,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	64,263,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	19,168,000		'	'	'
Southwestern Region | Legacy Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	72,415,000		'	'	'
Initial Costs, Land and Land Improvements	'	16,882,000		'	'	'
Initial Costs, Buildings and Improvements	'	100,102,000		'	'	'
Total Initial Acquisition Costs	'	116,984,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,685,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	17,101,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	105,568,000		'	'	'
Total Carrying Value	'	122,669,000		'	'	'
Accumulated Depreciation	'	37,798,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	122,669,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	37,798,000		'	'	'
Southwestern Region | DALLAS, TX	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	103,075,000		'	'	'
Initial Costs, Land and Land Improvements	'	83,453,000		'	'	'
Initial Costs, Buildings and Improvements	'	153,637,000		'	'	'
Total Initial Acquisition Costs	'	237,090,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	51,579,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	96,560,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	192,109,000		'	'	'
Total Carrying Value	'	288,669,000		'	'	'
Accumulated Depreciation	'	87,833,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	288,669,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	87,833,000		'	'	'
Southwestern Region | Barton Creek Landing	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,151,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,269,000		'	'	'
Total Initial Acquisition Costs	'	17,420,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	21,900,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,706,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	34,614,000		'	'	'
Total Carrying Value	'	39,320,000		'	'	'
Accumulated Depreciation	'	17,554,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,320,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,554,000		'	'	'
Southwestern Region | AUSTIN, TX	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	66,054,000		'	'	'
Initial Costs, Land and Land Improvements	'	16,417,000		'	'	'
Initial Costs, Buildings and Improvements	'	104,040,000		'	'	'
Total Initial Acquisition Costs	'	120,457,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	25,884,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	18,174,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	128,167,000		'	'	'
Total Carrying Value	'	146,341,000		'	'	'
Accumulated Depreciation	'	40,266,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	146,341,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	40,266,000		'	'	'
United Dominion Reality L.P.	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Total Carrying Value	'	4,188,480,000		4,182,920,000	4,205,298,000	3,706,184,000
Accumulated Depreciation	'	1,241,574,000		1,097,133,000	976,358,000	884,083,000
Aggregate cost for federal income tax purposes	'	3,500,000,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at beginning of the year	'	4,182,920,000		4,205,298,000	'	3,706,184,000
Real estate acquired	'	0		0	758,707,000	'
Capital expenditures and development	'	151,002,000		115,355,000	63,191,000	'
Real estate sold	'	-70,687,000		-116,166,000	-322,784,000	'
Retirement of fully depreciated assets	'	0		-13,945,000	0	'
Hurricane related impairment of assets	'	0		-7,622,000	0	'
Balance at end of the year	'	4,188,480,000		4,182,920,000	4,205,298,000	3,706,184,000
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at beginning of the year	'	1,097,133,000		976,358,000	'	884,083,000
Depreciation expense for the year	'	179,404,000		189,362,000	181,085,000	'
Accumulated depreciation on sales	'	-34,794,000		-54,085,000	-88,810,000	'
Accumulated depreciation on retirements of fully depreciated asset	'	0		-13,945,000	0	'
Write off of accumulated depreciation on hurricane related impaired assets	'	0		-557,000	0	'
Balance at end of year	'	1,241,574,000		1,097,133,000	976,358,000	884,083,000
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	'	-74,755,000		0	0	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Accumulated depreciation on retirements of fully depreciated asset	'	-169,000		0	0	'
United Dominion Reality L.P. | Other	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0	[2]	'	'	'
Initial Costs, Land and Land Improvements	'	0	[2]	'	'	'
Initial Costs, Buildings and Improvements	'	0	[2]	'	'	'
Total Initial Acquisition Costs	'	0	[2]	'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,126,000	[2]	'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	0	[2]	'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,126,000	[2]	'	'	'
Total Carrying Value	'	1,126,000	[2]	'	'	'
Accumulated Depreciation	'	0	[2]	'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,126,000	[2]	'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0	[2]	'	'	'
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	'	1,126,000		'	'	'
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	'	1,126,000		'	'	'
Total Carrying Value	'	1,126,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	1,126,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
United Dominion Reality L.P. | Real Estate Under Development	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	297,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,786,000		'	'	'
Total Initial Acquisition Costs	'	13,083,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	66,980,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,447,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	70,616,000		'	'	'
Total Carrying Value	'	80,063,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,063,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
United Dominion Reality L.P. | Real Estate Under Development | DelRey Tower [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	297,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,786,000		'	'	'
Total Initial Acquisition Costs	'	13,083,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	66,980,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,447,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	70,616,000		'	'	'
Total Carrying Value	'	80,063,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,063,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
United Dominion Reality L.P. | Land	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,524,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	1,524,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	921,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,445,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	0		'	'	'
Total Carrying Value	'	2,445,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	2,445,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	0		'	'	'
United Dominion Reality L.P. | Land | Presidio	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,524,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	1,524,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	921,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,445,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	0		'	'	'
Total Carrying Value	'	2,445,000		'	'	'
Accumulated Depreciation	'	0		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	2,445,000		'	'	'
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	'	1,407,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,498,000		'	'	'
Total Initial Acquisition Costs	'	5,905,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,518,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,380,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	6,043,000		'	'	'
Total Carrying Value	'	7,423,000		'	'	'
Accumulated Depreciation	'	1,714,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	7,423,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,714,000		'	'	'
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	'	1,407,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,498,000		'	'	'
Total Initial Acquisition Costs	'	5,905,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,644,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,380,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	7,169,000		'	'	'
Total Carrying Value	'	8,549,000		'	'	'
Accumulated Depreciation	'	1,714,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	8,549,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,714,000		'	'	'
United Dominion Reality L.P. | Commercial Held for Development | Total Real Estate Owned	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	934,865,000		'	'	'
Initial Costs, Land and Land Improvements	'	933,176,000		'	'	'
Initial Costs, Buildings and Improvements	'	2,492,576,000		'	'	'
Total Initial Acquisition Costs	'	3,425,752,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	762,728,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,013,894,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	3,174,586,000		'	'	'
Total Carrying Value	'	4,188,480,000		'	'	'
Accumulated Depreciation	'	1,241,574,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	4,188,480,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	1,241,574,000		'	'	'
United Dominion Reality L.P. | Western Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	391,591,000		'	'	'
Initial Costs, Land and Land Improvements	'	587,212,000		'	'	'
Initial Costs, Buildings and Improvements	'	1,029,623,000		'	'	'
Total Initial Acquisition Costs	'	1,616,835,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	448,403,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	643,868,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	1,421,370,000		'	'	'
Total Carrying Value	'	2,065,238,000		'	'	'
Accumulated Depreciation	'	652,439,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	2,065,238,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	652,439,000		'	'	'
United Dominion Reality L.P. | Western Region | Harbor at Mesa Verde	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	50,358,000		'	'	'
Initial Costs, Land and Land Improvements	'	20,476,000		'	'	'
Initial Costs, Buildings and Improvements	'	28,538,000		'	'	'
Total Initial Acquisition Costs	'	49,014,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	12,291,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	20,963,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	40,342,000		'	'	'
Total Carrying Value	'	61,305,000		'	'	'
Accumulated Depreciation	'	24,805,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,305,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,805,000		'	'	'
United Dominion Reality L.P. | Western Region | 27 Seventy FIve Mesa Verde [Member]	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,660,000		'	'	'
Initial Costs, Land and Land Improvements	'	99,329,000		'	'	'
Initial Costs, Buildings and Improvements	'	110,644,000		'	'	'
Total Initial Acquisition Costs	'	209,973,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	83,889,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	107,578,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	186,284,000		'	'	'
Total Carrying Value	'	293,862,000		'	'	'
Accumulated Depreciation	'	57,965,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	293,862,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	57,965,000		'	'	'
United Dominion Reality L.P. | Western Region | Pacific Shores	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	34,112,000		'	'	'
Initial Costs, Land and Land Improvements	'	7,345,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,624,000		'	'	'
Total Initial Acquisition Costs	'	29,969,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	31,056,000		'	'	'
Total Carrying Value	'	38,777,000		'	'	'
Accumulated Depreciation	'	18,492,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,777,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,492,000		'	'	'
United Dominion Reality L.P. | Western Region | Huntington Vista	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	27,972,000		'	'	'
Initial Costs, Land and Land Improvements	'	8,055,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,486,000		'	'	'
Total Initial Acquisition Costs	'	30,541,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,972,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,312,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,201,000		'	'	'
Total Carrying Value	'	37,513,000		'	'	'
Accumulated Depreciation	'	17,615,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	37,513,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,615,000		'	'	'
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	'	229,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,129,000		'	'	'
Total Initial Acquisition Costs	'	14,358,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,045,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,778,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	5,625,000		'	'	'
Total Carrying Value	'	16,403,000		'	'	'
Accumulated Depreciation	'	3,772,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,403,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	3,772,000		'	'	'
United Dominion Reality L.P. | Western Region | Coronado at Newport b North	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	62,516,000		'	'	'
Initial Costs, Buildings and Improvements	'	46,082,000		'	'	'
Total Initial Acquisition Costs	'	108,598,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	23,596,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	66,683,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	65,511,000		'	'	'
Total Carrying Value	'	132,194,000		'	'	'
Accumulated Depreciation	'	38,108,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	132,194,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,108,000		'	'	'
United Dominion Reality L.P. | Western Region | Huntington Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	50,771,000		'	'	'
Initial Costs, Land and Land Improvements	'	61,535,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,017,000		'	'	'
Total Initial Acquisition Costs	'	79,552,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,378,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	62,096,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	23,834,000		'	'	'
Total Carrying Value	'	85,930,000		'	'	'
Accumulated Depreciation	'	14,471,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	85,930,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,471,000		'	'	'
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	'	10,670,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,080,000		'	'	'
Total Initial Acquisition Costs	'	17,750,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,908,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,819,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,839,000		'	'	'
Total Carrying Value	'	19,658,000		'	'	'
Accumulated Depreciation	'	5,270,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,658,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	5,270,000		'	'	'
United Dominion Reality L.P. | Western Region | Coronado South	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	58,785,000		'	'	'
Initial Costs, Buildings and Improvements	'	50,067,000		'	'	'
Total Initial Acquisition Costs	'	108,852,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,881,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	59,183,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	66,550,000		'	'	'
Total Carrying Value	'	125,733,000		'	'	'
Accumulated Depreciation	'	36,990,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	125,733,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	36,990,000		'	'	'
United Dominion Reality L.P. | Western Region | ORANGE COUNTY, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	193,873,000		'	'	'
Initial Costs, Land and Land Improvements	'	328,940,000		'	'	'
Initial Costs, Buildings and Improvements	'	319,667,000		'	'	'
Total Initial Acquisition Costs	'	648,607,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	162,768,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	354,133,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	457,242,000		'	'	'
Total Carrying Value	'	811,375,000		'	'	'
Accumulated Depreciation	'	217,488,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	811,375,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	217,488,000		'	'	'
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	'	9,861,000		'	'	'
Initial Costs, Buildings and Improvements	'	44,578,000		'	'	'
Total Initial Acquisition Costs	'	54,439,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,254,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,221,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	51,472,000		'	'	'
Total Carrying Value	'	61,693,000		'	'	'
Accumulated Depreciation	'	22,853,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,693,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,853,000		'	'	'
United Dominion Reality L.P. | Western Region | Birch Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,365,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,696,000		'	'	'
Total Initial Acquisition Costs	'	21,061,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,026,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	22,185,000		'	'	'
Total Carrying Value	'	27,211,000		'	'	'
Accumulated Depreciation	'	12,068,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,211,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,068,000		'	'	'
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	'	5,996,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,868,000		'	'	'
Total Initial Acquisition Costs	'	30,864,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	25,534,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,095,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	49,303,000		'	'	'
Total Carrying Value	'	56,398,000		'	'	'
Accumulated Depreciation	'	23,816,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	56,398,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,816,000		'	'	'
United Dominion Reality L.P. | Western Region | Marina Playa	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,224,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,916,000		'	'	'
Total Initial Acquisition Costs	'	30,140,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,811,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,886,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,065,000		'	'	'
Total Carrying Value	'	38,951,000		'	'	'
Accumulated Depreciation	'	17,166,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,951,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,166,000		'	'	'
United Dominion Reality L.P. | Western Region | River Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	33,130,000		'	'	'
Initial Costs, Land and Land Improvements	'	22,161,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,137,000		'	'	'
Total Initial Acquisition Costs	'	62,298,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,851,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,308,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	42,841,000		'	'	'
Total Carrying Value	'	65,149,000		'	'	'
Accumulated Depreciation	'	21,251,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	65,149,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,251,000		'	'	'
United Dominion Reality L.P. | Western Region | CitySouth	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	14,031,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,537,000		'	'	'
Total Initial Acquisition Costs	'	44,568,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	35,031,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,220,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,379,000		'	'	'
Total Carrying Value	'	79,599,000		'	'	'
Accumulated Depreciation	'	25,108,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	79,599,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	25,108,000		'	'	'
United Dominion Reality L.P. | Western Region | Bay Terrace	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,545,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,458,000		'	'	'
Total Initial Acquisition Costs	'	23,003,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,357,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	15,947,000		'	'	'
Total Carrying Value	'	27,360,000		'	'	'
Accumulated Depreciation	'	7,730,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,360,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,730,000		'	'	'
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	'	5,353,000		'	'	'
Initial Costs, Buildings and Improvements	'	18,559,000		'	'	'
Total Initial Acquisition Costs	'	23,912,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	11,038,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,753,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	29,197,000		'	'	'
Total Carrying Value	'	34,950,000		'	'	'
Accumulated Depreciation	'	11,297,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	34,950,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,297,000		'	'	'
United Dominion Reality L.P. | Western Region | Edgewater	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	30,657,000		'	'	'
Initial Costs, Buildings and Improvements	'	83,872,000		'	'	'
Total Initial Acquisition Costs	'	114,529,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,861,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	30,675,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	86,715,000		'	'	'
Total Carrying Value	'	117,390,000		'	'	'
Accumulated Depreciation	'	29,050,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	117,390,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,050,000		'	'	'
United Dominion Reality L.P. | Western Region | Almaden Lake Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	27,000,000		'	'	'
Initial Costs, Land and Land Improvements	'	594,000		'	'	'
Initial Costs, Buildings and Improvements	'	42,515,000		'	'	'
Total Initial Acquisition Costs	'	43,109,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,367,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	729,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	46,747,000		'	'	'
Total Carrying Value	'	47,476,000		'	'	'
Accumulated Depreciation	'	15,391,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	47,476,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	15,391,000		'	'	'
United Dominion Reality L.P. | Western Region | SAN FRANCISCO, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	60,130,000		'	'	'
Initial Costs, Land and Land Improvements	'	107,787,000		'	'	'
Initial Costs, Buildings and Improvements	'	340,136,000		'	'	'
Total Initial Acquisition Costs	'	447,923,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	108,254,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	116,326,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	439,851,000		'	'	'
Total Carrying Value	'	556,177,000		'	'	'
Accumulated Depreciation	'	185,730,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	556,177,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	185,730,000		'	'	'
United Dominion Reality L.P. | Western Region | Rosebeach	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	8,414,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,449,000		'	'	'
Total Initial Acquisition Costs	'	25,863,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,664,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	8,558,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	19,969,000		'	'	'
Total Carrying Value	'	28,527,000		'	'	'
Accumulated Depreciation	'	10,949,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	28,527,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,949,000		'	'	'
United Dominion Reality L.P. | Western Region | Ocean Villas	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,135,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,789,000		'	'	'
Total Initial Acquisition Costs	'	17,924,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,671,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,245,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,350,000		'	'	'
Total Carrying Value	'	19,595,000		'	'	'
Accumulated Depreciation	'	7,652,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,595,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,652,000		'	'	'
United Dominion Reality L.P. | Western Region | Tierra Del Rey	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	32,635,000		'	'	'
Initial Costs, Land and Land Improvements	'	39,586,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,679,000		'	'	'
Total Initial Acquisition Costs	'	76,265,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,584,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	39,646,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,203,000		'	'	'
Total Carrying Value	'	78,849,000		'	'	'
Accumulated Depreciation	'	14,238,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	78,849,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,238,000		'	'	'
United Dominion Reality L.P. | Western Region | LOS ANGELES, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	32,635,000		'	'	'
Initial Costs, Land and Land Improvements	'	53,135,000		'	'	'
Initial Costs, Buildings and Improvements	'	66,917,000		'	'	'
Total Initial Acquisition Costs	'	120,052,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,919,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	53,449,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	73,522,000		'	'	'
Total Carrying Value	'	126,971,000		'	'	'
Accumulated Depreciation	'	32,839,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	126,971,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	32,839,000		'	'	'
United Dominion Reality L.P. | Western Region | Crowne Pointe	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,486,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,437,000		'	'	'
Total Initial Acquisition Costs	'	8,923,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,827,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,808,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,942,000		'	'	'
Total Carrying Value	'	13,750,000		'	'	'
Accumulated Depreciation	'	6,580,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,750,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,580,000		'	'	'
United Dominion Reality L.P. | Western Region | Hilltop	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,174,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,408,000		'	'	'
Total Initial Acquisition Costs	'	9,582,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,432,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,658,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,356,000		'	'	'
Total Carrying Value	'	13,014,000		'	'	'
Accumulated Depreciation	'	6,008,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	13,014,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,008,000		'	'	'
United Dominion Reality L.P. | Western Region | The Kennedy	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,179,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,307,000		'	'	'
Total Initial Acquisition Costs	'	28,486,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,593,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,232,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	23,847,000		'	'	'
Total Carrying Value	'	30,079,000		'	'	'
Accumulated Depreciation	'	11,244,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	30,079,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,244,000		'	'	'
United Dominion Reality L.P. | Western Region | Hearthstone at Merrill Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	23,341,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,848,000		'	'	'
Initial Costs, Buildings and Improvements	'	30,922,000		'	'	'
Total Initial Acquisition Costs	'	37,770,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,407,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,957,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	33,220,000		'	'	'
Total Carrying Value	'	40,177,000		'	'	'
Accumulated Depreciation	'	11,289,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	40,177,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	11,289,000		'	'	'
United Dominion Reality L.P. | Western Region | Island Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	21,284,000		'	'	'
Initial Costs, Buildings and Improvements	'	89,389,000		'	'	'
Total Initial Acquisition Costs	'	110,673,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,318,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,401,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	92,590,000		'	'	'
Total Carrying Value	'	113,991,000		'	'	'
Accumulated Depreciation	'	29,209,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	113,991,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,209,000		'	'	'
United Dominion Reality L.P. | Western Region | SEATTLE, WA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	23,341,000		'	'	'
Initial Costs, Land and Land Improvements	'	38,971,000		'	'	'
Initial Costs, Buildings and Improvements	'	156,463,000		'	'	'
Total Initial Acquisition Costs	'	195,434,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,577,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	40,056,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	170,955,000		'	'	'
Total Carrying Value	'	211,011,000		'	'	'
Accumulated Depreciation	'	64,330,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	211,011,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	64,330,000		'	'	'
United Dominion Reality L.P. | Western Region | Presidio at Rancho Del Oro	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	9,164,000		'	'	'
Initial Costs, Buildings and Improvements	'	22,694,000		'	'	'
Total Initial Acquisition Costs	'	31,858,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,270,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,722,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	28,406,000		'	'	'
Total Carrying Value	'	38,128,000		'	'	'
Accumulated Depreciation	'	16,802,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	38,128,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	16,802,000		'	'	'
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	'	6,517,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,718,000		'	'	'
Total Initial Acquisition Costs	'	17,235,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,059,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,722,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	12,572,000		'	'	'
Total Carrying Value	'	19,294,000		'	'	'
Accumulated Depreciation	'	6,607,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,294,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,607,000		'	'	'
United Dominion Reality L.P. | Western Region | SAN DIEGO, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	15,681,000		'	'	'
Initial Costs, Buildings and Improvements	'	33,412,000		'	'	'
Total Initial Acquisition Costs	'	49,093,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,329,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,444,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	40,978,000		'	'	'
Total Carrying Value	'	57,422,000		'	'	'
Accumulated Depreciation	'	23,409,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	57,422,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,409,000		'	'	'
United Dominion Reality L.P. | Western Region | Boronda Manor	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,946,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,982,000		'	'	'
Total Initial Acquisition Costs	'	10,928,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,126,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,145,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,909,000		'	'	'
Total Carrying Value	'	20,054,000		'	'	'
Accumulated Depreciation	'	7,952,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	20,054,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,952,000		'	'	'
United Dominion Reality L.P. | Western Region | Garden Court	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	888,000		'	'	'
Initial Costs, Buildings and Improvements	'	4,188,000		'	'	'
Total Initial Acquisition Costs	'	5,076,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,123,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,491,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	8,708,000		'	'	'
Total Carrying Value	'	10,199,000		'	'	'
Accumulated Depreciation	'	4,203,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,199,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,203,000		'	'	'
United Dominion Reality L.P. | Western Region | Cambridge Court	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,039,000		'	'	'
Initial Costs, Buildings and Improvements	'	12,883,000		'	'	'
Total Initial Acquisition Costs	'	15,922,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,910,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,197,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,635,000		'	'	'
Total Carrying Value	'	29,832,000		'	'	'
Accumulated Depreciation	'	12,143,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	29,832,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,143,000		'	'	'
United Dominion Reality L.P. | Western Region | Laurel Tree	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,304,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,115,000		'	'	'
Total Initial Acquisition Costs	'	6,419,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,577,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,131,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,865,000		'	'	'
Total Carrying Value	'	11,996,000		'	'	'
Accumulated Depreciation	'	4,904,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	11,996,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,904,000		'	'	'
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	'	6,388,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,854,000		'	'	'
Total Initial Acquisition Costs	'	30,242,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	24,885,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,816,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	45,311,000		'	'	'
Total Carrying Value	'	55,127,000		'	'	'
Accumulated Depreciation	'	21,627,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	55,127,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,627,000		'	'	'
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	'	2,044,000		'	'	'
Initial Costs, Buildings and Improvements	'	8,028,000		'	'	'
Total Initial Acquisition Costs	'	10,072,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,451,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,242,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	16,281,000		'	'	'
Total Carrying Value	'	19,523,000		'	'	'
Accumulated Depreciation	'	8,239,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	19,523,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,239,000		'	'	'
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	'	1,329,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,334,000		'	'	'
Total Initial Acquisition Costs	'	6,663,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,883,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,129,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	10,417,000		'	'	'
Total Carrying Value	'	12,546,000		'	'	'
Accumulated Depreciation	'	4,854,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,546,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,854,000		'	'	'
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	'	16,938,000		'	'	'
Initial Costs, Buildings and Improvements	'	68,384,000		'	'	'
Total Initial Acquisition Costs	'	85,322,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	73,955,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	27,151,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	132,126,000		'	'	'
Total Carrying Value	'	159,277,000		'	'	'
Accumulated Depreciation	'	63,922,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	159,277,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	63,922,000		'	'	'
United Dominion Reality L.P. | Western Region | Verano at Rancho Cucamonga Town Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,471,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,557,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,645,000		'	'	'
Total Initial Acquisition Costs	'	17,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	52,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,995,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	47,201,000		'	'	'
Total Carrying Value	'	70,196,000		'	'	'
Accumulated Depreciation	'	28,367,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	70,196,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	28,367,000		'	'	'
United Dominion Reality L.P. | Western Region | INLAND EMPIRE, CA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,471,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,557,000		'	'	'
Initial Costs, Buildings and Improvements	'	3,645,000		'	'	'
Total Initial Acquisition Costs	'	17,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	52,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,995,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	47,201,000		'	'	'
Total Carrying Value	'	70,196,000		'	'	'
Accumulated Depreciation	'	28,367,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	70,196,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	28,367,000		'	'	'
United Dominion Reality L.P. | Western Region | Tualatin Heights	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,273,000		'	'	'
Initial Costs, Buildings and Improvements	'	9,134,000		'	'	'
Total Initial Acquisition Costs	'	12,407,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,204,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,813,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,798,000		'	'	'
Total Carrying Value	'	18,611,000		'	'	'
Accumulated Depreciation	'	9,082,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	18,611,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,082,000		'	'	'
United Dominion Reality L.P. | Western Region | Andover Park	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	16,818,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,916,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,995,000		'	'	'
Total Initial Acquisition Costs	'	19,911,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,783,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	3,150,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	24,544,000		'	'	'
Total Carrying Value	'	27,694,000		'	'	'
Accumulated Depreciation	'	14,770,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	27,694,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,770,000		'	'	'
United Dominion Reality L.P. | Western Region | Hunt Club	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	18,323,000		'	'	'
Initial Costs, Land and Land Improvements	'	6,014,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,870,000		'	'	'
Total Initial Acquisition Costs	'	20,884,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,620,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	6,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,153,000		'	'	'
Total Carrying Value	'	26,504,000		'	'	'
Accumulated Depreciation	'	12,502,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,504,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,502,000		'	'	'
United Dominion Reality L.P. | Western Region | PORTLAND, OR	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	35,141,000		'	'	'
Initial Costs, Land and Land Improvements	'	12,203,000		'	'	'
Initial Costs, Buildings and Improvements	'	40,999,000		'	'	'
Total Initial Acquisition Costs	'	53,202,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,607,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	13,314,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	59,495,000		'	'	'
Total Carrying Value	'	72,809,000		'	'	'
Accumulated Depreciation	'	36,354,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	72,809,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	36,354,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	145,762,000		'	'	'
Initial Costs, Land and Land Improvements	'	120,287,000		'	'	'
Initial Costs, Buildings and Improvements	'	502,957,000		'	'	'
Total Initial Acquisition Costs	'	623,244,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	83,360,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	124,072,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	582,532,000		'	'	'
Total Carrying Value	'	706,604,000		'	'	'
Accumulated Depreciation	'	254,616,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	706,604,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	254,616,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | The Whitmore	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	6,418,000		'	'	'
Initial Costs, Buildings and Improvements	'	13,411,000		'	'	'
Total Initial Acquisition Costs	'	19,829,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	19,931,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	7,460,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	32,300,000		'	'	'
Total Carrying Value	'	39,760,000		'	'	'
Accumulated Depreciation	'	20,140,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,760,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	20,140,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Ridgewood	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	5,612,000		'	'	'
Initial Costs, Buildings and Improvements	'	20,086,000		'	'	'
Total Initial Acquisition Costs	'	25,698,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,864,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,986,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	27,576,000		'	'	'
Total Carrying Value	'	33,562,000		'	'	'
Accumulated Depreciation	'	18,660,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	33,562,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,660,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Wellington Place at Olde Town	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	28,681,000		'	'	'
Initial Costs, Land and Land Improvements	'	13,753,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,059,000		'	'	'
Total Initial Acquisition Costs	'	49,812,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	16,856,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,629,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	52,039,000		'	'	'
Total Carrying Value	'	66,668,000		'	'	'
Accumulated Depreciation	'	29,361,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	66,668,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	29,361,000		'	'	'
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	'	14,357,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,577,000		'	'	'
Total Initial Acquisition Costs	'	65,934,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,755,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	14,373,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	54,316,000		'	'	'
Total Carrying Value	'	68,689,000		'	'	'
Accumulated Depreciation	'	21,542,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	68,689,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	21,542,000		'	'	'
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	'	1,137,000		'	'	'
Initial Costs, Buildings and Improvements	'	103,676,000		'	'	'
Total Initial Acquisition Costs	'	104,813,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,352,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,235,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	107,930,000		'	'	'
Total Carrying Value	'	109,165,000		'	'	'
Accumulated Depreciation	'	38,559,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	109,165,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,559,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Circle Towers	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	70,328,000		'	'	'
Initial Costs, Land and Land Improvements	'	32,815,000		'	'	'
Initial Costs, Buildings and Improvements	'	107,051,000		'	'	'
Total Initial Acquisition Costs	'	139,866,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,199,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	32,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	116,071,000		'	'	'
Total Carrying Value	'	149,065,000		'	'	'
Accumulated Depreciation	'	37,847,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	149,065,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	37,847,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Delancey at Shirlington	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	21,606,000		'	'	'
Initial Costs, Buildings and Improvements	'	66,765,000		'	'	'
Total Initial Acquisition Costs	'	88,371,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,441,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	21,621,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	68,191,000		'	'	'
Total Carrying Value	'	89,812,000		'	'	'
Accumulated Depreciation	'	22,662,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	89,812,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	22,662,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | METROPOLITAN DC	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	99,009,000		'	'	'
Initial Costs, Land and Land Improvements	'	95,698,000		'	'	'
Initial Costs, Buildings and Improvements	'	398,625,000		'	'	'
Total Initial Acquisition Costs	'	494,323,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	62,398,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	98,298,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	458,423,000		'	'	'
Total Carrying Value	'	556,721,000		'	'	'
Accumulated Depreciation	'	188,771,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	556,721,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	188,771,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Lakeside Mill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	15,242,000		'	'	'
Initial Costs, Land and Land Improvements	'	2,666,000		'	'	'
Initial Costs, Buildings and Improvements	'	10,109,000		'	'	'
Total Initial Acquisition Costs	'	12,775,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,189,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,919,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	14,045,000		'	'	'
Total Carrying Value	'	16,964,000		'	'	'
Accumulated Depreciation	'	10,290,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,964,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,290,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Tamar Meadow	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,145,000		'	'	'
Initial Costs, Buildings and Improvements	'	17,150,000		'	'	'
Total Initial Acquisition Costs	'	21,295,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,707,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,559,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	21,443,000		'	'	'
Total Carrying Value	'	26,002,000		'	'	'
Accumulated Depreciation	'	14,199,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	26,002,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,199,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | Calvertbs Walk	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,408,000		'	'	'
Initial Costs, Buildings and Improvements	'	24,692,000		'	'	'
Total Initial Acquisition Costs	'	29,100,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,436,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,660,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,876,000		'	'	'
Total Carrying Value	'	35,536,000		'	'	'
Accumulated Depreciation	'	18,463,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,536,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,463,000		'	'	'
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	'	1,620,000		'	'	'
Initial Costs, Buildings and Improvements	'	6,791,000		'	'	'
Total Initial Acquisition Costs	'	8,411,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	1,149,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,646,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	7,914,000		'	'	'
Total Carrying Value	'	9,560,000		'	'	'
Accumulated Depreciation	'	4,770,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	9,560,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	4,770,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | 20 Lambourne	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	31,511,000		'	'	'
Initial Costs, Land and Land Improvements	'	11,750,000		'	'	'
Initial Costs, Buildings and Improvements	'	45,590,000		'	'	'
Total Initial Acquisition Costs	'	57,340,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,481,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,990,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	49,831,000		'	'	'
Total Carrying Value	'	61,821,000		'	'	'
Accumulated Depreciation	'	18,123,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	61,821,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,123,000		'	'	'
United Dominion Reality L.P. | Mid Atlantic Region | BALTIMORE, MD	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	46,753,000		'	'	'
Initial Costs, Land and Land Improvements	'	24,589,000		'	'	'
Initial Costs, Buildings and Improvements	'	104,332,000		'	'	'
Total Initial Acquisition Costs	'	128,921,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	20,962,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	25,774,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	124,109,000		'	'	'
Total Carrying Value	'	149,883,000		'	'	'
Accumulated Depreciation	'	65,845,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	149,883,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	65,845,000		'	'	'
United Dominion Reality L.P. | Southeastern Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	47,572,000		'	'	'
Initial Costs, Buildings and Improvements	'	170,881,000		'	'	'
Total Initial Acquisition Costs	'	218,453,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	109,696,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	55,524,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	272,626,000		'	'	'
Total Carrying Value	'	328,150,000		'	'	'
Accumulated Depreciation	'	165,328,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	328,150,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	165,328,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Sugar Mill Creek	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,242,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,553,000		'	'	'
Total Initial Acquisition Costs	'	9,795,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,567,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,720,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,642,000		'	'	'
Total Carrying Value	'	16,362,000		'	'	'
Accumulated Depreciation	'	8,401,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	16,362,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	8,401,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Inlet Bay	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	7,702,000		'	'	'
Initial Costs, Buildings and Improvements	'	23,150,000		'	'	'
Total Initial Acquisition Costs	'	30,852,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	13,740,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	9,005,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	35,587,000		'	'	'
Total Carrying Value	'	44,592,000		'	'	'
Accumulated Depreciation	'	24,223,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	44,592,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,223,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | MacAlpine Place	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,869,000		'	'	'
Initial Costs, Buildings and Improvements	'	36,858,000		'	'	'
Total Initial Acquisition Costs	'	47,727,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,862,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	11,264,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	43,325,000		'	'	'
Total Carrying Value	'	54,589,000		'	'	'
Accumulated Depreciation	'	24,392,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	54,589,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	24,392,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | TAMPA, FL	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	20,813,000		'	'	'
Initial Costs, Buildings and Improvements	'	67,561,000		'	'	'
Total Initial Acquisition Costs	'	88,374,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	27,169,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	22,989,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	92,554,000		'	'	'
Total Carrying Value	'	115,543,000		'	'	'
Accumulated Depreciation	'	57,016,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	115,543,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	57,016,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Legacy Hill	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,148,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,867,000		'	'	'
Total Initial Acquisition Costs	'	7,015,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	8,460,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,721,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	13,756,000		'	'	'
Total Carrying Value	'	15,477,000		'	'	'
Accumulated Depreciation	'	10,377,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	15,477,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	10,377,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Hickory Run	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	1,469,000		'	'	'
Initial Costs, Buildings and Improvements	'	11,584,000		'	'	'
Total Initial Acquisition Costs	'	13,053,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	9,295,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	2,086,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	20,262,000		'	'	'
Total Carrying Value	'	22,348,000		'	'	'
Accumulated Depreciation	'	12,690,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	22,348,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	12,690,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Carrington Hills	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	2,117,000		'	'	'
Initial Costs, Buildings and Improvements	'	0		'	'	'
Total Initial Acquisition Costs	'	2,117,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	33,002,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,413,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,706,000		'	'	'
Total Carrying Value	'	35,119,000		'	'	'
Accumulated Depreciation	'	18,870,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	35,119,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,870,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Brookridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	708,000		'	'	'
Initial Costs, Buildings and Improvements	'	5,461,000		'	'	'
Total Initial Acquisition Costs	'	6,169,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,311,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,118,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	9,362,000		'	'	'
Total Carrying Value	'	10,480,000		'	'	'
Accumulated Depreciation	'	6,288,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	10,480,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	6,288,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Breckenridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	766,000		'	'	'
Initial Costs, Buildings and Improvements	'	7,714,000		'	'	'
Total Initial Acquisition Costs	'	8,480,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	4,093,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	1,222,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	11,351,000		'	'	'
Total Carrying Value	'	12,573,000		'	'	'
Accumulated Depreciation	'	7,249,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	12,573,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	7,249,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | Polo Park	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	4,583,000		'	'	'
Initial Costs, Buildings and Improvements	'	16,293,000		'	'	'
Total Initial Acquisition Costs	'	20,876,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,729,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	5,624,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	30,981,000		'	'	'
Total Carrying Value	'	36,605,000		'	'	'
Accumulated Depreciation	'	18,530,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	36,605,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	18,530,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | NASHVILLE, TN	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,791,000		'	'	'
Initial Costs, Buildings and Improvements	'	46,919,000		'	'	'
Total Initial Acquisition Costs	'	57,710,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	74,890,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,184,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	116,418,000		'	'	'
Total Carrying Value	'	132,602,000		'	'	'
Accumulated Depreciation	'	74,004,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	132,602,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	74,004,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | The Reserve and Park at Riverbridge	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,968,000		'	'	'
Initial Costs, Buildings and Improvements	'	56,401,000		'	'	'
Total Initial Acquisition Costs	'	72,369,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,637,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,654,000		'	'	'
Total Carrying Value	'	80,005,000		'	'	'
Accumulated Depreciation	'	34,308,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,005,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	34,308,000		'	'	'
United Dominion Reality L.P. | Southeastern Region | OTHER FLORIDA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	40,133,000		'	'	'
Initial Costs, Land and Land Improvements	'	15,968,000		'	'	'
Initial Costs, Buildings and Improvements	'	56,401,000		'	'	'
Total Initial Acquisition Costs	'	72,369,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,637,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	16,351,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	63,654,000		'	'	'
Total Carrying Value	'	80,005,000		'	'	'
Accumulated Depreciation	'	34,308,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	80,005,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	34,308,000		'	'	'
United Dominion Reality L.P. | Northeast Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	254,304,000		'	'	'
Initial Costs, Land and Land Improvements	'	130,808,000		'	'	'
Initial Costs, Buildings and Improvements	'	624,509,000		'	'	'
Total Initial Acquisition Costs	'	755,317,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	15,863,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	131,042,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	640,138,000		'	'	'
Total Carrying Value	'	771,180,000		'	'	'
Accumulated Depreciation	'	92,957,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	771,180,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	92,957,000		'	'	'
United Dominion Reality L.P. | Northeast Region | Inwood West	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	57,928,000		'	'	'
Initial Costs, Land and Land Improvements	'	20,778,000		'	'	'
Initial Costs, Buildings and Improvements	'	88,096,000		'	'	'
Total Initial Acquisition Costs	'	108,874,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,559,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	20,849,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	90,584,000		'	'	'
Total Carrying Value	'	111,433,000		'	'	'
Accumulated Depreciation	'	14,498,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	111,433,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	14,498,000		'	'	'
United Dominion Reality L.P. | Northeast Region | 14 North	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	10,961,000		'	'	'
Initial Costs, Buildings and Improvements	'	51,175,000		'	'	'
Total Initial Acquisition Costs	'	62,136,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	2,827,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	10,994,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	53,969,000		'	'	'
Total Carrying Value	'	64,963,000		'	'	'
Accumulated Depreciation	'	9,118,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	64,963,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	9,118,000		'	'	'
United Dominion Reality L.P. | Northeast Region | BOSTON, MA	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	57,928,000		'	'	'
Initial Costs, Land and Land Improvements	'	31,739,000		'	'	'
Initial Costs, Buildings and Improvements	'	139,271,000		'	'	'
Total Initial Acquisition Costs	'	171,010,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,386,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	31,843,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	144,553,000		'	'	'
Total Carrying Value	'	176,396,000		'	'	'
Accumulated Depreciation	'	23,616,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	176,396,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	23,616,000		'	'	'
United Dominion Reality L.P. | Northeast Region | 10 Hanover Square	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	196,376,000		'	'	'
Initial Costs, Land and Land Improvements	'	41,432,000		'	'	'
Initial Costs, Buildings and Improvements	'	218,983,000		'	'	'
Total Initial Acquisition Costs	'	260,415,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	6,821,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	41,463,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	225,773,000		'	'	'
Total Carrying Value	'	267,236,000		'	'	'
Accumulated Depreciation	'	31,043,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	267,236,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	31,043,000		'	'	'
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	'	57,637,000		'	'	'
Initial Costs, Buildings and Improvements	'	266,255,000		'	'	'
Total Initial Acquisition Costs	'	323,892,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	3,656,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	57,736,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	269,812,000		'	'	'
Total Carrying Value	'	327,548,000		'	'	'
Accumulated Depreciation	'	38,298,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	327,548,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	38,298,000		'	'	'
United Dominion Reality L.P. | Northeast Region | NEW YORK, NY	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	196,376,000		'	'	'
Initial Costs, Land and Land Improvements	'	99,069,000		'	'	'
Initial Costs, Buildings and Improvements	'	485,238,000		'	'	'
Total Initial Acquisition Costs	'	584,307,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	10,477,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	99,199,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	495,585,000		'	'	'
Total Carrying Value	'	594,784,000		'	'	'
Accumulated Depreciation	'	69,341,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	594,784,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	69,341,000		'	'	'
United Dominion Reality L.P. | Southwestern Region	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	103,075,000		'	'	'
Initial Costs, Land and Land Improvements	'	44,069,000		'	'	'
Initial Costs, Buildings and Improvements	'	147,322,000		'	'	'
Total Initial Acquisition Costs	'	191,391,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	34,861,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	46,116,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	180,135,000		'	'	'
Total Carrying Value	'	226,251,000		'	'	'
Accumulated Depreciation	'	74,520,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	226,251,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	74,520,000		'	'	'
United Dominion Reality L.P. | Southwestern Region | THIRTY377	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	30,660,000		'	'	'
Initial Costs, Land and Land Improvements	'	24,036,000		'	'	'
Initial Costs, Buildings and Improvements	'	32,951,000		'	'	'
Total Initial Acquisition Costs	'	56,987,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	7,276,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	24,309,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	39,956,000		'	'	'
Total Carrying Value	'	64,265,000		'	'	'
Accumulated Depreciation	'	19,168,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	64,265,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	19,168,000		'	'	'
United Dominion Reality L.P. | Southwestern Region | Legacy Village	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	72,415,000		'	'	'
Initial Costs, Land and Land Improvements	'	16,882,000		'	'	'
Initial Costs, Buildings and Improvements	'	100,102,000		'	'	'
Total Initial Acquisition Costs	'	116,984,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	5,685,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	17,101,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	105,568,000		'	'	'
Total Carrying Value	'	122,669,000		'	'	'
Accumulated Depreciation	'	37,798,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	122,669,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	37,798,000		'	'	'
United Dominion Reality L.P. | Southwestern Region | DALLAS, TX	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	103,075,000		'	'	'
Initial Costs, Land and Land Improvements	'	40,918,000		'	'	'
Initial Costs, Buildings and Improvements	'	133,053,000		'	'	'
Total Initial Acquisition Costs	'	173,971,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	12,961,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	41,410,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	145,524,000		'	'	'
Total Carrying Value	'	186,934,000		'	'	'
Accumulated Depreciation	'	56,966,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	186,934,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	56,966,000		'	'	'
United Dominion Reality L.P. | Southwestern Region | Barton Creek Landing	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,151,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,269,000		'	'	'
Total Initial Acquisition Costs	'	17,420,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	21,900,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,706,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	34,611,000		'	'	'
Total Carrying Value	'	39,317,000		'	'	'
Accumulated Depreciation	'	17,554,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,317,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,554,000		'	'	'
United Dominion Reality L.P. | Southwestern Region | AUSTIN, TX	'	'		'	'	'
Real Estate and Accumulated Depreciation [Line Items]	'	'		'	'	'
Encumbrances	'	0		'	'	'
Initial Costs, Land and Land Improvements	'	3,151,000		'	'	'
Initial Costs, Buildings and Improvements	'	14,269,000		'	'	'
Total Initial Acquisition Costs	'	17,420,000		'	'	'
Costs of Improvements Capitalized Subsequent to Acquisition Costs	'	21,900,000		'	'	'
Gross Amount at Which Carried at Close of Period, Land and Land Improvements	'	4,706,000		'	'	'
Gross Amount at Which Carried at Close of Period, Buildings & Buildings Improvements	'	34,611,000		'	'	'
Total Carrying Value	'	39,317,000		'	'	'
Accumulated Depreciation	'	17,554,000		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Balance at end of the year	'	39,317,000		'	'	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Balance at end of year	'	17,554,000		'	'	'
Corporate Joint Venture [Member]	'	'		'	'	'
Real Estate Owned, Gross [Roll Forward]	'	'		'	'	'
Real estate acquired	'	129,437,000		0	0	'
Retirement of fully depreciated assets	'	-356,303,000		0	0	'
Real Estate Owned, Accumulated Depreciation [Roll Forward]	'	'		'	'	'
Accumulated depreciation on retirements of fully depreciated asset	'	($20,662,000)		$0	$0	'
[1]	Includes unallocated accruals and capital expenditures.The aggregate cost for federal income tax purposes was approximately $7.5 billion at December 31, 2013. 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 $3.5 billion at December 31, 2011.

IncomeLoss_Per_Share_UNITED_DO3

Income/(Loss) Per Share (UNITED DOMINION REALTY, L.P.) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Income/(loss) from discontinued operations, net of tax	$41,376	$884	$829	$853	$1,016	($389)	$180,268	$85,713	$43,942	$266,608	$147,454
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	46,282	220,303	20,585
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	'	'	'	'	'	'	'	'	$1,720	$8,206	$158