6. There’s a Secret Floor at 20 Exchange

Mechanical floor of 20 Exchange

The building has 57 floor occupied floors. But despite having 27 separate elevators, they only serve up to the 56th floor. In order to get to the top floor, residents have to head into the stairwell and walk up the last flight. But that’s only the highest occupied floor. On top of that are the mechanical floors, (which hold 21 separate boilers), and the roof.