Rockefeller Group

Rockefeller Group International, Inc. is an American private company based in New York City, primarily involved in real estate operations in the United States and it is a subsidiary of Mitsubishi Group. The company began with the development of Rockefeller Center. Mitsubishi Estate, a real estate company of the Mitsubishi Group, purchased the Rockefeller Group in 1989.
After completing the original, Art Deco complex from 1931 to 1939, the company developed several towers in the immediate vicinity from the late 1940s into the 1950s and 1960s. It entered into a partnership with Time Inc. and constructed a 48-story building for the company, 1271 Avenue of the Americas, that opened in 1959. By the early 1970s, it had added three more International Style towers to Rockefeller Center, more than doubling the size of the original complex.
Today, Rockefeller Group maintains an ownership/management position in the of office space that makes up Rockefeller Center's western corridor. The eastern and original part of the Center is now owned by Tishman Speyer and the Lester Crown family of Chicago, Illinois.