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The Sears Tower renamed the Willis Tower in Chicago

The 110-story Willis Tower rises above the street in Chicago on July 16, 2009. The London-based Willis Group Holdings secured the naming rights to the nation's tallest skyscraper, formerly known as the Sears Tower, as part of its agreement to lease 140,000 square feet of office space in the building. The iconic structure, which has dominated Chicago's skyline since its construction in 1973, was officially renamed in a Thursday ceremony. (UPI Photo/Brian Kersey)

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