It hard to get an exact read on the current height. I think parts of the roof may be at different heights now as I cant get a look at the actual concrete roof from the downtown view. However looking at the building from the most recent uptown shot as here:
https://www.instagram.com/p/B1eYHqCAVbe/
...CPT looks like its has reached its final roof height of 1515 ft. Note the very high ceiling top floor in line with the schematics. If that top floor ceiling height is about 15-18ft tall as it looks to be, than that would be the top/last habitable floor before the parapet.
I note from the downtown views of CPT it is much harder to assess the height as the building is covered in netting. j