UDR, Inc. is a multifamily real estate investment trust which is engaged in managing, buying, selling, developing and redeveloping real estate communities in United States markets. The Company operates through two segments, which include Same-Store Communities and Non-Mature Communities/Other. The Same-Store Communities represent those communities acquired, developed, and stabilized. The Non-Mature Communities/Other segments represent those communities that do not meet the criteria to be included in Same-Store Communities, including, but not limited to acquired, developed and redeveloped communities, and the non-apartment components of mixed-use properties. Its apartment portfolio consists of approximately 161 communities with a total of 54,081 apartment homes located in 21 markets. The Company's subsidiaries include United Dominion Realty, L.P. (the Operating Partnership) and UDR Lighthouse DownREIT L.P. (the DownREIT Partnership).