[LouisVanDerWright]

If its not a giant precast garage then its probably a staging thing. Build the tower totally separately from a structural standpoint so you can launch the tower and then come back and build the complicated garage ramps and floors while work continues on the large tower above. We all know how long podia can take to construct, just look at River South tower 1. Now imagine being able to do that while the rest of the tower is rising at full speed.