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Designed by Graham and Khan
The tower was designed by the architect Bruce Graham and the structural engineer Fazlur Khan of Skidmore, Owings & Merrill. Its X-braced exterior is part of the structure: the braces help hold the building against wind, which left more open floor space inside.


Built from 1965 to 1969
Construction began in 1965. In 1967 work paused after a flaw was found in the method used to pour the concrete foundations, and the John Hancock Mutual Life Insurance Company took over the project with the original design and team. The building topped out on 6 May 1968, then the second-tallest in the world, and was completed in 1969.
From observatory to 360 CHICAGO
The building rises 100 storeys, 344 metres (1,128 feet) to its roof, with offices below and homes above. In 2014 the observatory on the 94th floor was renovated and renamed 360 CHICAGO, and TILT opened that summer. In 2018 the tower took the name of its address, 875 North Michigan Avenue.


