The plan included several towers , the tallest one being a proposed 120-story mixed use twin tower skyscraper to stand about high to the roof , which would have made it the tallest building in the United States , over taller than the Willis Tower , containing office , residential , and hotel space .
The plan includes several towers , the tallest one being a proposed 120-story mixed use twin tower skyscraper that will stand about 2000 ft high to the roof , which would make it the tallest building in the United States , over 500 ft taller than the Willis Tower , and will contain office , residential , and hotel space .