It doesn&#x27;t help that most cities outside Manhattan have parking requirements and often quite high ones, to the point where the parking for an office building takes up as much floor space as the offices themselves. And since elevators can&#x27;t really transport cars very efficiently, your 100 story building will need to be surrounded by 10 10-story parking garages (or, more typically, you&#x27;ll have a 30 story building with lots of surface parking around). If you factor in all the surface parking, you don&#x27;t end up with very much density in the end.