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December 2016
The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,451-foot skyscraper in Chicago, Illinois, United States.
Find out moreThe Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,451-foot skyscraper in Chicago, Illinois, United States.
Find out more