Willis Tower
Sears Tower

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Willis Tower, Chicago
Quick Facts
City Chicago
Country United States of America
Year 1971 - 1974
Floors 110
Height 442.3 m / 1 451 ft
Surface 423 638 m² / 4 560 000 ft²
Realization
Architect
Skidmore, Owings & Merrill (Bruce Graham)
Engineer
Skidmore, Owings & Merrill (Fazlur Rahman Khan)
Construction cost 175 million USD
Building Info
Alias
Sears Tower
Address 233 South Wacker Drive
Block bounded by Franklin Street and Wacker Drive, Adams Street and Jackson Boulevard
Materials
structural steel
black anodized aluminum
bronze-tinted glass
Status Completed
Notes
  • Tallest building in the world from 1974 until 1997.
  • The antennae were added in 1982.
  • Height including the antennae is 1730 feet (527 meters).
  • 104 elevators.
  • 74,000 tons of steel were used for the construction.
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