a group of 19 buildings in Manhattan, New York, used for offices and various kinds of entertainment. They were mostly built between 1931 and 1939, in the art deco style, by John D Rockefeller Junior, on land owned by Columbia University. The buildings are connected by underground passages containing shops. They include Radio City Music Hall and the central General Electric Building (former RCA Building). The center is also famous for its Christmas tree and lights that are put up each year, as well as its outdoor winter ice-skating rink.