Just for fun while rebuilding the top...
The triple-height top floor, mechanics and engineers only, I'm afraid. Some renders don't show an actual roof over this level, so the roof height might actually be 1,224" instead of 1,264'6" (1,270' is to the top of a 4 1/2 foot glass parapet, the 1,358/1,278 figures are wrong. Sorry, can't give you a source on that one).