Flight, There is actually no structure within the built up area adjacent to Tower II. In order to go ahead with Tower III it will be necessary to remove all the built up soils and excavate. That built up soil is not bearing anyway, it is the dirt from the excavation of Tower II, take a look at this pic of construction of the original Metropolis and Tower I, both the Tower II and Tower III sites are in the previous bus loop.
Not sure if you've had the chance to see the site in the last couple of weeks, but they are relocating the fire lane right now so that they can begin excavation in mid to late August.
The excavation site had the trees removed last month, many of them were actually removed with a tree spade and are being stored off site for re-use once the project is complete.