The eastern tower contains the Rainbow Room restaurant on the 65th floor, while the Rockefeller family office occupied the tower's 54th through 56th floors until 2014. The tower also serves as the headquarters of NBC, and houses NBC Studios, NBC News, MSNBC, and network flagship station WNBC; and until 1988, the NBC Radio Network. Although NBC has continuously occupied the building since 1933, it did not own the space it occupied until 1996, when it gained ownership within a condominium arrangement. From 1937 onward, the top of the tower also contained neon letters spelling "RCA", though these were later replaced by "GE" letters, and in 2014, replaced again with the new united Comcast/NBC logo, now rendered with longer-lasting LED lighting.