Rockefeller Center is a complex of 19 commercial buildings covering 22 acres between 48th and 51st Streets in New York City. Built by the Rockefeller family, it is located in the center of Midtown Manhattan, spanning between Fifth Avenue and Seventh Avenue. It was declared a National Historic Landmark in 1987. It is the largest privately held complex of its kind in the world, and an international symbol of modernist architectural style blended with capitalism.