Verified record
BBR-OOVM-222J · Evidence reviewed and adjudicated
Structural engineer of the world's tallest building (1973–1998)
Designed the structure of the Sears (Willis) Tower, the world's tallest building for 25 years.
Record holderFazlur Rahman Khan
Date achieved3 May 1973
Official statement
Dhaka-born engineer Fazlur Rahman Khan developed the bundled-tube structural system used for Chicago's Sears Tower (now Willis Tower), topped out on 3 May 1973. It remained the world's tallest building until 1998.
Criteria met
- 01Verify structural engineer attribution in project records.
- 02Check construction records for topping-out date.
- 03Verify tallest-building tenure against authority records.
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