GE SignThat’s appears to be the cable giant’s plan: The city’s Landmarks Preservation Commission will vote Tuesday on a proposed “certificate of appropriateness” allowing Comcast to install signs with its logo and NBC peacock at the Rockefeller Center art deco landmark, popularly known as the RCA Building. COMCASTThe current one says GE. But it sold the building to Comcast last year as part of a $1.4B agreement that transferred NBCUniversal’s real estate to the cable company when it also bought GE’s 49% stake in the entertainment power. The new signage proposal would replace the 24-foot-high red neon sign on top of the building with 12-foot high LED signs on the north and south exteriors — with the Comcast logo (which includes the NBC peacock) in white capital letters. The western facade would have a 17-foot-high peacock. In addition to the changes at the top of the building, Comcast wants to adapt the marquee on Sixth Avenue to showcase The Tonight Show Starring Jimmy Fallon. The building, completed in 1933, became an official landmark in 1985 and has served as a fixture for shows including Seinfeld and, of course, 30 Rock