NBC 4 New York: One of New York City’s most popular skyscrapers, 30 Rockefeller Plaza, lit up Wednesday evening with a new corporate name: the Comcast Building. The rooftop signs on the 70-story building replace the General Electric initials and add the company’s logo and the NBC Peacock logo to the Manhattan skyline. It’s the first time that the iconic peacock has appeared on top of the television network’s historic headquarters. The day is historically significant for NBCUniversal. On July 1, 1941, 30 Rockefeller Plaza was home to the first commercial television broadcast.