This doesn't work for a number of reasons. The floor to ceilings are higher on the upper units, but more significantly, it does not account for the portion of the height attributable to the mechanical penthouse which sits above the last occupiable floor (i.e., the 56th floor). If the reports that the height is 625 feet to the top of the last occupiable floor are accurate, then the simple math is 48/56 x 625, which comes to 535 feet. This doesn't even account for the higher floor to ceilings on the upper floors, meaning that this is somewhere shy of 535, perhaps around 525. If this is all true, we have a lot more height to go, about 160 feet worth.