CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL (UNITED DOMINION REALTY, L.P.) (Unaudited). - United Dominion Realty L.P. - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Beginning Balance	$ 1,284,457	$ 1,429,738	$ 1,365,886	$ 1,485,889
Net income/(loss)	19,057	27,283	63,558	79,427
Distributions	(66,635)	(63,367)	(199,928)	(189,896)
Long Term Incentive Plan Unit grants	3,444	6,563	12,108	21,980
Unrealized gain/(loss) on derivative financial investments	(6)		(49)
Net contributions/(distributions) to/(from) noncontrolling interests			(1,258)	2,817
Ending Balance	1,240,317	1,400,217	1,240,317	1,400,217
Accumulated Other Comprehensive Income/(Loss), net
Beginning Balance	(43)
Unrealized gain/(loss) on derivative financial investments	(6)		(49)
Ending Balance	(49)		(49)
Total Partner's Capital
Beginning Balance	1,267,300	1,412,298	1,348,481	1,472,070
Net income/(loss)	18,622	26,835	62,113	78,175
Distributions	(66,635)	(63,367)	(199,928)	(189,896)
Long Term Incentive Plan Unit grants	3,444	6,563	12,108	21,980
Unrealized gain/(loss) on derivative financial investments	(6)		(49)
Ending Balance	1,222,725	1,382,329	1,222,725	1,382,329
Noncontrolling Interests
Beginning Balance	17,157	17,440	17,405	13,819
Net income/(loss)	435	448	1,445	1,252
Net contributions/(distributions) to/(from) noncontrolling interests			(1,258)	2,817
Ending Balance	17,592	17,888	17,592	17,888
Class A Limited Partner
Beginning Balance	65,477	78,633	81,803	69,401
Net income/(loss)	176	255	589	743
Distributions	(631)	(599)	(1,893)	(1,797)
Adjustment to reflect limited partners' capital at redemption value	(7,900)	6,632	(23,377)	16,574
Ending Balance	57,122	84,921	57,122	84,921
Limited Partners and LTIP Units
Beginning Balance	256,536	273,910	284,580	302,545
Net income/(loss)	691	890	2,306	2,610
Distributions	(2,564)	(2,416)	(7,717)	(7,095)
OP Unit redemptions for common shares of UDR			(110)	(78,622)
Adjustment to reflect limited partners' capital at redemption value	(34,308)	16,868	(67,368)	54,397
Long Term Incentive Plan Unit grants	3,444	6,563	12,108	21,980
Ending Balance	223,799	295,815	223,799	295,815
Limited Partner
Beginning Balance	944,525	1,058,850	981,239	1,099,174
Net income/(loss)	17,744	25,674	59,181	74,775
Distributions	(63,400)	(60,314)	(190,198)	(180,890)
OP Unit redemptions for common shares of UDR			110	78,622
Adjustment to reflect limited partners' capital at redemption value	42,208	(23,500)	90,745	(70,971)
Ending Balance	941,077	1,000,710	941,077	1,000,710
General Partner
Beginning Balance	805	905	859	950
Net income/(loss)	11	16	37	47
Distributions	(40)	(38)	(120)	(114)
Ending Balance	$ 776	$ 883	$ 776	$ 883