At risk of being wrong again, here is another speculative attempt resolving the mystery of Tower 1 floor count and building height:
After examinating and scaling the renderings, photographs and information regarding Tower 1 available on this web site, and
http://en.wikipedia.org/wiki/One_Rincon_Hill, I have made the following new estimate:
(57 levels x 11' ht.) + 1 level 14' high lobby = 641 feet! The 57 levels includes 53 floors of condos, 1 mezzanine, and 3 levels above the condos, all at the estimated floor-to-floor height of 11'. Counting occupied floors only, it may be still okay to call One Rincon Hill Tower 1 a 55 story, 641' tower based on this assumption. If we include all 58 tower levels, plus 5 levels of parking below, we get a total of 63 levels. The 5 lower levels below the main entrance seem to be more than 60 feet deep, bringing the total height from the first floor to the top of the crown at somewhere around, or greater than 700 feet for 63 levels.
Some additional possibilities: The concrete floor slabs may be somewhere around 11" or 12" thick. It is possible that dropped ceilings of some sort may allow for concealing mechanical ducts, plumbing and electrical in the space between the finish ceilings and the concrete floor slabs. This may result in a clear finish floor to finish ceiling height of anywhere between 9 and 10 feet.