In 1985, the New York City Landmarks Preservation Commission declared that the entire original Rockefeller Center would officially become a city landmark. A year afterward, the observatory was closed to make way for an expansion of the Rainbow Room, which in turn isolated the observation deck from its elevators. The elevators from the ground level only reached the 65th floor, and observatory visitors were required to transfer to another "shuttle" elevator that went between the 65th and 69th floors. The RCA Building was renamed the GE Building in 1988, two years after General Electric re-acquired the RCA Corporation.