Willis group holdings

CHICAGO - The Sears Tower, one of the world's iconic skyscrapers and the tallest building in the U.S., was renamed the Willis Tower on Thursday in a downtown ceremony, marking a new chapter in the history of the giant edifice that has dominated the Chicago skyline for nearly four decades.

CHICAGO - The Sears Tower, one of the world's iconic skyscrapers and the tallest building in the U.S., was renamed the Willis Tower on Thursday in a downtown ceremony, marking a new chapter in the history of the giant edifice that has dominated the Chicago skyline for nearly four decades.