John Hancock Center and Sears Tower built | 150 Engage Illinois Office of Corporate Relations
Celebrating our Sesquicentennial 1867-2017
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Fazlur Khan developed structural systems - trussed tube system and bundled tube system - that formed the basis of high-rise design. He designed the John Hancock Center (1970) and Sears Tower (1973).

Dates: 
Jan 01, 1970 to Jan 01, 1973
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