Apparently the new World Trace Center skips a lot of floors 1 through 20 and 94-99 to appear taller than it is.
http://en.wikipedia.org/wiki/One_World_Trade_Center#Layout
Layout
One World Trade Center's top floor is officially designated as floor 104.[5] The building has 86 usable above-ground floors, of which 78 will be used for office purposes (approximately 2,600,000 square feet, or 240,000 square meters).[136][137][138] The base consists of floors 1–19, including a 65-foot-high (20 m) public lobby. The office floors begin at floor 20, and go up to floor 63. There is a sky lobby on floor 64; office floors resume on floor 65, and stop at floor 90. Floors 91–99 and 103–104 are mechanical floors.[10]
The tower has a three-story observation deck located on floors 100–102, and broadcast and antenna facilities.[10] Similar to the Empire State Building, visitors are separated from the tenants, having their own separate entrance next to the museum, descending down to a below-ground security screening area.[139] The observation deck is expected to open in spring 2015, with an admission fee of $32 per person,[140][141] and is expected to have about 3.5 million visitors per year.[142]
The tenants have access to below-ground parking, storage, and shopping; access to PATH, New York City Subway trains, and the World Financial Center is also provided at the World Trade Center Transportation Hub, Fulton Street/Fulton Center, Chambers Street, and Cortlandt Street stations.[143] The building allows direct access to West Street, Vesey Street, and Fulton Street at ground level.[143] The building has an approximate underground footprint of 42,000 square feet (3,900 m2),[143] of which 55,000 square feet (5,100 m2) is retail space. A plan to build a restaurant near the top of the tower, similar to the original One World Trade Center's Windows on the World, was abandoned as logistically impractical. The tower's window-washing tracks are located on a 16-square-foot area, which will be designated as floor 110 as a symbolic reference to the 110 floors of the original tower.[144]
