Initially constructed in 1973 as the Sears Tower, the now Willis Tower is the tallest building in Chicago at 110-stories, 1451´. In 1985, Enclos was involved in renovations at the Tower, including providing a large glazed entrance that complemented the grandeur of the Tower.
After holding the title of the tallest building in the world from 1974 until 1998, the Willis Tower is currently the 3rd-tallest building in the United States.