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