Not that great of a build- just 9 boxy towers of varying height with the default windows, probably duped. It doesn't even look like you took the care to make stairs or an elevator; or make the whole build flow, for that matter. You didn't even take time to make the top cool.
And furthermore "It is the tallest known tower in the United States of America"? Are there ones that are hiding from us?
Edit: Also, the tower doesn't even follow it's original. I just noticed that it seems to be a central tower of four with others scattered about. If you look at the Sears Tower, you'll notice that there are 9 smaller towers meshed together, with two ending at one step, two more ending another step up, three more ending on the final step and two remaining at the tower's final height without the antennas.