[AK47KC]

If the towers are too tall, they will look alienated from the rest of the skyline level which is around 500' (152m) to 600' (183m) at the Transbay Terminal. The Planning Commission probably won't like three towers sticking way up from the skyline because from afar. That's why there are two other towers to gradually smooth out the otherwise precipitous drop from over 1000' (305m) to the skyline level; around a 400' (122m) drop. If all the towers are over 1100' (351m), then there will be a large drop of 500' (152m) to the skyline level around the Transbay Terminal. It will take more towers to smooth out the drop and the Planning Commission doesn't want the Transbay area to be completely crowded with towers.