DDR (formerly Developers Diversified Realty) is a self-administered real estate investment trust (REIT) that acquires, develops, renovates, leases, and manages retail and office properties. Its portfolio includes some 500 community shopping centers, malls, and other retail properties in the US, Brazil, and Puerto Rico. All together DDR owns more than 120 million sq. ft of space and more than 1,800 acres of undeveloped land. Almost half of its shopping centers are owned through joint ventures. DDR's largest tenants include Wal-Mart, PetSmart, TJX, and Kohl's. No longer primarily a development firm, the REIT changed its name to DDR in 2011.