The Willis Tower (formerly named, and still commonly referred to as the Sears Tower) is a 108-story, 1451-foot (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1973, it was the tallest building in the world, surpassing the World Trade Center towers in New York, and it held this rank for nearly 25 years. The Willis Tower is the tallest building in the United States and the fifth-tallest freestanding structure in the world, as well as the fifth tallest building in the world to the roof.
Named the Sears Tower throughout its history, in 2009 the Willis Group obtained the right to rename the building, as part of their lease on a portion of its offices. On July 16, 2009, the building was officially renamed the Willis Tower. On August 13, 2012, United Airlines announced it will be moving its corporate headquarters from 77 West Wacker Drive to the Willis Tower.
Ferris Bueller's Day Off filming location.