Consolidated Statements of Cash Flows (UNITED DOMINION REALTY, L.P) (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities
Consolidated net income/(loss)	$ (13,747)	$ (52,666)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	177,305	148,464
Net gain on the sale of depreciable property	(44,699)	(156)
Write off of bad debt	1,241	1,208
Amortization of deferred financing costs and other	4,238	3,939
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	(10,642)	2,973
Increase/(decrease) in operating liabilities	(9,049)	(12,546)
Net cash provided by operating activities	115,075	101,779
Investing Activities
Acquisition of real estate assets (net of liabilities assumed) and initial capital expenditures	(109,148)
Cash paid in nonmonetary asset exchange	(28,124)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	(37,691)	(36,432)
Net cash used in investing activities	(266,060)	(122,191)
Financing Activities
Proceeds from the issuance of secured debt	19,204	51,880
Payments on secured debt	(204,896)	(83,845)
Payment of financing costs	(3,380)	(2,491)
Net cash provided by financing activities	163,133	22,501
Net increase in cash and cash equivalents	12,148	2,089
Cash and cash equivalents, beginning of period	9,486	5,985
Cash and cash equivalents, end of period	21,634	8,074
Supplemental Information:
Interest paid during the period, net of amounts capitalized	83,233	78,991
Non-cash transactions:
Properties acquired, including intengibles in asset exchange	268,853
Properties disposed in asset exchange, net of accumulated depreciation	192,576
OP Units issued in partial consideration for property acquisition	62,878
Secured debt assumed in the acquisitions of properties, including asset exchange	247,805
Secured debt transferred in asset exchange	55,356
Fair market value adjustment of secured debt assumed in acquisitions of properties, including asset exchange	21,915
United Dominion Reality.L.P [Member]
Operating Activities
Consolidated net income/(loss)	5,504	(5,485)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	91,383	83,123
Net gain on the sale of depreciable property	(16,038)	(97)
Write off of bad debt	799	718
Amortization of deferred financing costs and other	1,045	748
Changes in operating assets and liabilities:
(Increase)/decrease in operating assets	(7,244)	2,253
Increase/(decrease) in operating liabilities	4,228	(859)
Net cash provided by operating activities	79,677	80,401
Investing Activities
Acquisition of real estate assets (net of liabilities assumed) and initial capital expenditures	(3,285)
Cash paid in nonmonetary asset exchange	(15,407)
Capital expenditures and other major improvements - real estate assets, net of escrow reimbursement	(29,767)	(28,248)
Net cash used in investing activities	(48,459)	(28,248)
Financing Activities
Payments to General Partner	(6,022)	(59,087)
Proceeds from the issuance of secured debt	925	11,326
Payments on secured debt	(15,542)	(1,281)
Payment of financing costs	(855)	(104)
OP unit redemption		(327)
Distributions paid to partnership unitholder	(2,952)	(2,764)
Net cash provided by financing activities	(24,446)	(52,237)
Net increase in cash and cash equivalents	6,772	(84)
Cash and cash equivalents, beginning of period	920	442
Cash and cash equivalents, end of period	7,692	358
Supplemental Information:
Interest paid during the period, net of amounts capitalized	27,102	26,155
Non-cash transactions:
Properties acquired, including intengibles in asset exchange	178,353
Properties disposed in asset exchange, net of accumulated depreciation	139,725
OP Units issued in partial consideration for property acquisition	62,878
Secured debt assumed in the acquisitions of properties, including asset exchange	247,805
Secured debt transferred in asset exchange	55,356
Fair market value adjustment of secured debt assumed in acquisitions of properties, including asset exchange	$ 21,915