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The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,451-foot (442 m) skyscraper in Chicago, Illinois, United States. At completion in 1973, it surpassed the World Trade Center towers in New York to become the tallest building in the world, a title it held for nearly 25 years. The Willis Tower is the second-tallest building in the United States and the 14th-tallest in the world.
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