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The Willis Tower was made by putting a signature to a lease contract. The Willis Tower is formerly known as the Sears Tower. See related links for details.
structural steel, black anodized aluminum, bronze-tinted glass, and reinforced concrete.
1
The Sears Tower now officially named Willis Tower is located in Chicago, Illinois. Sears Tower/Willis Tower 233 S Wacker Dr Chicago, IL 60606 The former Sears Tower, currently named the Willis Tower, is bordered on its South side by Jackson Boulevard, on its North side by Adams Street, on its West side by Wacker Drive, and on its East side by Franklin Street.
Yes
11,000 tons of steel.
Steel
Concrete, glass, wood and steel were used to build the Calgary tower.
Stone and steel.
steel and glass
500,000