Chicago is home to the [[Sears Tower|Willis Tower]], which at 1,450 feet is the tallest building in the United States, and was once the tallest building in the world. The building, more commonly known locally and internationally as the "Sears Tower", was originally the headquarters of Sears when constructed. In the late 2000s, London-based Willis Insurance bought the naming rights to the tower upon leasing a significant amount of space.<ref>http://www.thesearstower.com/buildinginfo.axis?type=n&name=Property Profile </ref> | Chicago is home to the [[Sears Tower|Willis Tower]], which at 1,450 feet is the tallest building in the United States, and was once the tallest building in the world. The building, more commonly known locally and internationally as the "Sears Tower", was originally the headquarters of Sears when constructed. In the late 2000s, London-based Willis Insurance bought the naming rights to the tower upon leasing a significant amount of space.<ref>http://www.thesearstower.com/buildinginfo.axis?type=n&name=Property Profile </ref> |