description Willis Tower (Sears Tower) Overview
A true architectural landmark, the Willis Tower embodies the power and ambition of early 20th-century skyscraper design. Its sheer scale and Art Deco detailing make it a cultural touchstone. While newer towers are taller, the Willis Tower's historical significance, robust structural integrity, and enduring presence in the Chicago skyline give it immense architectural weight and enduring appeal.
help Willis Tower (Sears Tower) FAQ
Why is the Willis Tower still famous if it is no longer the tallest building?
The building opened as the Sears Tower in Chicago in 1973 and was once the tallest building in the world. Its bundled-tube structure by Skidmore, Owings & Merrill made it a major engineering landmark.
Is Willis Tower the same building as Sears Tower?
Yes. The Chicago skyscraper was known as Sears Tower for decades and was renamed Willis Tower in 2009 after Willis Group leased space and obtained naming rights.
What is the Skydeck at Willis Tower?
Skydeck Chicago is the observation deck on the 103rd floor of Willis Tower. Its glass boxes, called The Ledge, extend outside the facade and look down over Chicago.
Who designed Willis Tower and what makes its structure unusual?
Willis Tower was designed by Skidmore, Owings & Merrill, with structural engineer Fazlur Rahman Khan associated with its bundled-tube system. Instead of one simple tower shaft, it uses nine square tubes grouped together at different heights.
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