 The Empire State Plaza consists of various steel and reinforced concrete buildings, all clad in imported stone (except The Egg, which fully exposes its concrete structure).The buildings are placed on a 6-story stone-clad Main Platform, supported by more than 25,000 steel pilings driven an average of into soft glacial clay deposits underlying the site.The placement of starkly abstract geometric building forms on a monolithic plaza is said to represent Rockefeller's concept of architecture as similar to sculpture.