CHICAGO - The Sears Tower has officially become the Willis Tower in a ceremony in downtown Chicago.
The country's tallest building and one of the world's iconic skyscrapers was renamed Thursday after London-based insurance brokerage Willis Group Holdings as part of its deal to lease 140,000 square feet of space in the tower.
Company Chairman and CEO Joseph Plumeri and Mayor Richard Daley unveiled a sign out front bearing the tower's new name.
The 110-story skyscraper had been called the Sears Tower since its opening in 1973. Its original tenant, Sears Roebuck and Co., moved out in 1992.
