A later proposal had the roadway situated ten stories above valuable commercial real estate. Air rights above the expressway would be sold and new high-rise buildings would be constructed above the expressway; buildings would be constructed below the viaduct as well. One unusual variation involved running the roadway through the sixth and seventh floors of the Empire State Building. In 1963, plans for the expressway were finalized, and it received the I-495 designation. Beginning from its elevated connections to 12th Avenue (NY 9A) or the West Side Elevated Highway, the Mid-Manhattan Expressway would mostly follow 30th Street east of Ninth Avenue. The expressway would travel east as a six-lane elevated route, ten stories above the city streets to allow for commercial development both above and below the skyway deck. At Second Avenue, it would swing north for connections with the FDR Drive. Between First and Second Avenues, ramps would be constructed to provide access to the Queens–Midtown Tunnel.