David Wilstein (March 8, 1928 – July 9, 2017) was an American real estate developer and philanthropist.He developed over 100 buildings in Los Angeles as well as in Japan, Thailand, Turkey and China.[3][4] In 1976, Wilstein founded Realtech Construction Co., a real estate development company,[3] with his brother Leonard.[3][4] Additionally, he designed the Century City Medical Plaza,[4] whose penthouse his office was based in.[2] Wilstein made charitable contributions to causes in Los Angeles and Israel.