CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
REVENUES:
Rental income	$ 367,748	$ 309,116	$ 723,929	$ 608,942
Joint venture management and other fees	$ 1,419	$ 2,232	$ 2,504	$ 3,847
Type of revenue	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember	udr:ManagementAndOtherFeesMember
Total revenues	$ 369,167	$ 311,348	$ 726,433	$ 612,789
OPERATING EXPENSES:
Property operating and maintenance	60,405	51,335	118,889	102,716
Real estate taxes and insurance	52,788	49,145	106,552	96,532
Property management	11,952	9,273	23,528	18,268
Other operating expenses	5,027	4,373	9,739	8,808
Real estate depreciation and amortization	167,584	146,169	331,206	290,257
General and administrative	16,585	15,127	31,493	27,863
Casualty-related charges/(recoveries), net	1,074	(2,463)	309	3,114
Other depreciation and amortization	3,016	2,602	6,091	5,203
Total operating expenses	318,431	275,561	627,807	552,761
Gain/(loss) on sale of real estate owned	0	0	0	50,829
Operating income	50,736	35,787	98,626	110,857
Income/(loss) from unconsolidated entities	(11,229)	9,751	(5,817)	14,673
Interest expense	(36,832)	(35,404)	(72,748)	(113,560)
Interest income and other income/(expense), net	3,001	2,536	561	4,593
Income/(loss) before income taxes	5,676	12,670	20,622	16,563
Tax (provision)/benefit, net	(312)	(135)	(655)	(754)
Net income/(loss)	5,364	12,535	19,967	15,809
Net (income)/loss attributable to redeemable noncontrolling interests in the Operating Partnership and DownREIT Partnership	(272)	(807)	(1,151)	(961)
Net (income)/loss attributable to noncontrolling interests	(8)	(8)	(27)	(24)
Net income/(loss) attributable to UDR, Inc.	5,084	11,720	18,789	14,824
Distributions to preferred stockholders - Series E (Convertible)	(1,109)	(1,057)	(2,201)	(2,113)
Net income/(loss) attributable to common stockholders	$ 3,975	$ 10,663	$ 16,588	$ 12,711
Income/(loss) per weighted average common share - basic	$ 0.01	$ 0.04	$ 0.05	$ 0.04
Income/(loss) per weighted average common share - diluted	$ 0.01	$ 0.04	$ 0.05	$ 0.04
Weighted average number of common shares outstanding - basic	318,351	296,589	318,181	296,564
Weighted average number of common shares outstanding - diluted	319,572	297,542	319,592	297,221