Sumitomo Realty & Development Co., Ltd. is a Japanese real estate development company headquartered in Shinjuku, Tokyo. It is a member of the Sumitomo Group. It is one of the three largest real estate developers in Japan, alongside Mitsubishi Estate and Mitsui Fudosan. As of 2018, it has the second-largest real estate portfolio in Japan, with a total value of 5.7 trillion yen. Wikipedia