AEWORLDMAP.COM (3,300+ posts)

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Building: Willis Tower
Location: 233 S. Wacker Drive, Chicago, Illinois 60606
Completion: 1973
Architect: Skidmore, Owings and Merrill
Structural Engineer: Fazlur Khan
Mechanical/Electrical Engineer: Jaros Baum and Bolles
Contractor: Diesel Construction

AE Interests: Formerly the Sears Tower, this 108 story structure is the third tallest in the United States and twenty-sixth tallest in the world. The design consists of nine square “tubes” clustered in a 3×3 matrix and contains steel, belt trusses, and louvers. `

Updated by Stephen Smith, 2025