[wwmiv]

A few responses, but they're all good for height:

A) they're almost certainly going to have 12 foot ceilings for floors 10 through 51, given the way that this building has been marketed thus far.

B) I'd bet that there's a good chance for 14 foot ceilings (i.e. ceiling height which is in today's market considered the top) for floors 52+, for the same reason.

C) I agree re: penthouse. Those floor plans are rarely if ever marketed in the same way, and there's almost certainly 2-4 penthouse units at two stories each bringing the floor count to 60.

D) re: mechanical level. This is probably synonymous with the cube on top.

E) the first two floors are likely to have 14-16 foot plate to plate heights, with floors 3 thru 9 likely having 10 foot ceiling heights since they aren't residential units, but rather are likely parking levels.

F) you're forgetting that ceiling heights are always necessarily shorter than plate to plate heights because of the stuff between each floor. So all of those heights above for ceilings actually translate into greater height than you're thinking by anywhere between .5 and 1.5 feet depending on the design.

G) amenities are probably located on the first two floors, and since they're marketing a sky fitness center I think there's likely a level between the top marketed units and the penthouse suites or above the penthouse suites (less likely) that is amenity as well. That's another 12 feet.

In other words, this building will be anywhere between ~765 (assuming the lowest values possible for ceiling heights and taking into account point F above) and ~825 feet without including the mechanical level's potential cubic architectural flourishes. With the fact that the official hints have been that the top is an architectural flourish, I'd say this building is between ~790 and ~850. It is impossible that this building will not be taller than the Austonian.