Quote:
Originally Posted by chief56
Not to mention you have a street running through the middle of the building, so you need to span that distance and be able to support a tower sitting above it. I bet the east mat is another core to help stabilize/carry the load.
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From some drawings I came across online it appears the "baby mat" mentioned by BVic might be for the parking garage that appears to be planned for what you might call the fourth tower (the 11 story tower that's farthest east)
Another factor that might be a concern from a structural engineering viewpoint is the affect of wind.
The two tall towers with the extensive foundations are of substantially different heights, one about 550 ft tall and the other about 1200 ft tall, and I would think strong wind from the north or south could create torsional stress on the building.