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The base of the building contains a retail complex known as the Catalog. The facade is made of anodized aluminum and black glass. The tower has 108 stories as counted by standard methods, though the building's owners count the main roof as 109 and the mechanical penthouse roof as 110. Graham and Khan designed the building as nine square " tubes", clustered in a 3×3 matrix seven of the tubes set back at upper floors. The building occupies a site bounded by Franklin Street, Jackson Boulevard, Wacker Drive, and Adams Street. Each year, more than 1.7 million people visit the Skydeck observation deck, the highest in the United States, making it one of Chicago's most popular tourist destinations. It is the third-tallest building in the Western Hemisphere, as well as the 23rd-tallest in the world. Designed by architect Bruce Graham and engineer Fazlur Rahman Khan of Skidmore, Owings & Merrill (SOM), it opened in 1973 as the world's tallest building, a title that it held for nearly 25 years. The Willis Tower (originally the Sears Tower) is a 110- story, 1,451-foot (442.3 m) skyscraper in the Loop community area of Chicago in Illinois, United States.

Archived from the original on September 23, 2015. September 1973 50 years ago ( September 1973)ġ04, with 16 double-decker elevators, made by Westinghouse, modernized by Schindler Group and recently remodernized by Otis Elevator CompanyĪon Fire Protection Engineering, formerly Schirmer Engineering Corporation (Fire)