Willis Tower, Skyscraper in Chicago Loop, United States
Willis Tower is an office tower in the Chicago Loop that rises 442 meters across 108 floors above ground. The facade is clad in black aluminum and thousands of glass windows arranged in a rectangular grid that steps back at intervals as it climbs.
Construction started in 1970 for Sears Roebuck & Company and took four years to complete, opening in 1974. The tower held the title of tallest building in the world for more than two decades until 1998.
Tourists from across the world step into the glass box while office workers inside the tower conduct meetings just floors away, as if two separate worlds occupy the same address. Locals still call the building the Sears Tower, showing how deeply the former tenant remains embedded in the city memory.
The Skydeck on the 103rd floor is the main draw for views that stretch across several states. Booking online helps avoid long lines, especially on weekends and during summer months.
The design uses nine square tubes arranged in a three by three matrix, with seven stepping back at different heights. This bundled tube system allowed large floor spans without interior columns and changed the way engineers build skyscrapers around the world.
Location: Chicago
Inception: 1974
Architects: Skidmore, Owings & Merrill, Bruce Graham, Fazlur Khan
Official opening: May 1973
Architectural style: International Style
Floors above the ground: 110
Floors below the ground: 3
Elevators: 104
Height: 442.1 m
Made from material: glass, aluminium, steel
Website: http://willistower.com
GPS coordinates: 41.87861,-87.63583
Latest update: December 12, 2025 16:34
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