 In 1985, the Rockefeller Group, a subsidiary of Japanese developer Mitsubishi Estate Co., bought Rockefeller Center.A year later, Mitsui Fudosan purchased 1251 Avenue of the Americas for $610 million.Japanese realty and development company Sumitomo Realty & Development followed by purchasing 666 Fifth Avenue for $500 million in 1987, just one year after Integrated Resources had purchased it.