The Chicago-based Council on Tall Buildings and Urban Habitat has ruled that One World Trade Center is taller than Willis Tower:
The decision by the Chicago-based Council on Tall Buildings and Urban Habitat hinged on whether the tower's mast was a spire, which counts in height measurements, or an antenna, which doesn't.
The decision will end Willis Tower's reign of 40 years as the nation's tallest building.
The announcement culminated weeks of speculation about the ruling, which drew widespread attention because it would finally settle the issue of whether Chicago or New York could claim bragging rights to having the nation’s and the Western Hemisphere’s tallest building, as well as whether One World Trade Center would achieve the symbolic height of 541 m.
Willis Tower, completed in 1974 and once the world’s tallest building, is 442 m tall. Dubai’s Burj Khalifa, the current holder of the title, is 828 m tall.
The decision means One World Trade Center is the 3rd tallest building in the world, and drops Willis Tower to 10th place overall.