CONSOLIDATION AND BASIS OF PRESENTATION (UNITED DOMINION REALTY, L.P.)	12 Months Ended
	Dec. 31, 2018
Entity information
CONSOLIDATION AND BASIS OF PRESENTATION	1. 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, 2018, our consolidated apartment portfolio consisted of 127 consolidated communities located in 19 markets consisting of 39,931 apartment homes. In addition, the Company has an ownership interest in 8,112 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, 2018 and 2017, there were 183,636,543 and 183,350,924 units, respectively, in the Operating Partnership (“OP Units”) outstanding, of which 174,248,699, or 94.9% and 174,237,688, or 95.0%, respectively, were owned by UDR and 9,387,844, or 5.1% and 9,113,236, or 5.0%, respectively, were owned by outside limited partners. As of December 31, 2018 and 2017, there were 32,367,380 units in the DownREIT Partnership (“DownREIT Units”) outstanding, of which 17,203,489, or 53.2% and 16,866,443, or 52.1%, respectively, were owned by UDR (of which, 13,470,651, or 41.6%, were held by the Operating Partnership for both periods) and 15,163,891, or 46.8% and 15,500,937, or 47.9%, respectively, 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 in Note 2, Significant Accounting Policies, Note 3, Real Estate Owned, Note 5, Joint Ventures and Partnerships and Note 14, Commitments and Contingencies.
United Dominion Reality L.P.
Entity information
CONSOLIDATION AND BASIS OF PRESENTATION	1. 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, 2018, 2017, and 2016, rental revenues of the Operating Partnership represented 42%, 43%, and 43%, respectively, of the General Partner’s consolidated rental revenues. As of December 31, 2018, the Operating Partnership’s apartment portfolio consisted of 52 communities located in 15 markets consisting of 16,434 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, 2018, there were 183,636,543 OP Units outstanding, of which 174,248,699, or 94.9%, were owned by UDR and affiliated entities and 9,387,844, or 5.1%, were owned by non-affiliated limited partners. There were 183,350,924 OP Units outstanding as of December 31, 2017, of which 174,237,688, or 95.0%, were owned by UDR and affiliated entities and 9,113,236, or 5.0%, were owned by non-affiliated limited partners. See Note 9, Capital Structure. 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, 2018 and 2017. At December 31, 2018 and 2017, there were 183,525,660 and 183,240,041, respectively, of limited partner OP Units outstanding, of which 1,873,332 were Class A Limited Partnership Units as of both periods. Of the limited partner OP Units outstanding, UDR owned 174,137,816, or 94.8%, and 174,126,805, or 95.0%, at December 31, 2018 and 2017, respectively. The remaining 9,387,844, or 5.1%, and 9,113,236, or 5.0%, of the limited partner OP Units outstanding were held by non-affiliated partners at December 31, 2018 and 2017, respectively, of which 1,751,671 were Class A Limited Partnership units as of both periods. See Note 9, Capital Structure. The Operating Partnership evaluated subsequent events through the date its financial statements were issued. No significant recognized or non-recognized subsequent events were noted.