30 Rockefeller Plaza is an American Art Deco skyscraper that forms the centerpiece of Rockefeller Center in midtown Manhattan, New York City, NY. The exterior signage was changed to reflect the building's new name, Comcast Building, on July 1, 2015, following the transfer of ownership to a corporate owner, Comcast. It was formerly called the RCA Building from 1933 to 1988, and later the GE Building from 1988 to 2015. Nicknames include The Slab and 30 Rock. The building is most famous for housing the NBC television network headquarters. At high, the 70-story building is the 14th tallest in New York City and the 39th tallest in the United States.

Comcast Center is a skyscraper in Center City, Philadelphia, Pennsylvania, United States. The 58-story, tower is the tallest building in Philadelphia and the nineteenth tallest building in the United States. Originally called One Pennsylvania Plaza when the building was first announced in 2001, the Comcast Center went through two redesigns before construction began in 2005. Comcast Center was designed by architect Robert A. M. Stern for Liberty Property Trust.