Dude, are you familiar with the likely site for this building? It's potentially a block long east/west, but quite narrow--maybe 1/3 of a block at most. So your design should have those dimensions (east/west dimesnion should be about 3 times the north/south dimension). Also, what the city planners are almost certainly going to want is something fairly thin and elegant--and NOT bulky. In other words, anything like the Sears Tower is exactly what would bring the NIMBYs out in droves and give the Planning Dept. a collective heart attack.