The Willis Tower, formerly called Sears Tower, is located at 233 S. Wacker Drive, Chicago, Illinois 60606
1,there is only 1. 2,it's 442 m
the sears tower was built in 1973
108-stories, 1,451 feet (442 m) or 1,730 feet (527 m) if you include the antennas
To consolidate the office functions for Sears.