Isn't it true that in Chicago the parking garages of buildings are built above ground? If so, just increase the height of Toronto buildings by the depth of the underground parking and voila your super-talls? Personally I'd rather keep the parking underground and maintain the street-level vitality.
^^^ looks like the MODS will have to move all their own "parking" posts... at least I mentioned the "Trump" word in this thread. ;-)