John Hancock Center Chicago

The John Hancock Center, is a 100-story, 1,128-foot supertall skyscraper located in Chicago,
Illinois. Located in the Magnificent Mile district, its name was changed to 875 North Michigan
Avenue on February 12, 2018.  It was constructed under the supervision of Skidmore, Owings
and Merrill, with chief designer Bruce Graham and structural engineer Fazlur Khan.  When the
building topped out on May 6, 1968, it was the second-tallest building in the world and the tallest
outside New York City.

History

The project, which would become the world's second-tallest building at the opening, was
conceived and owned by Jerry Wolman in late 1964. The project was financed by John Hancock
Mutual Life Insurance Company. Construction of the tower was interrupted in 1967 due to a flaw
in an innovative engineering method used to pour concrete in stages, that was discovered when
the building was 20 stories high. The engineers were getting the same soil settlements for the
20 stories that had been built as what they had expected for the entire 99 stories.

 About

This forced the owner to stop development until the engineering problem could be resolved,
resulting in a credit crunch. The situation is similar to the one faced during the construction of
111 West Wacker, then known as the Waterview Tower. Wolman's bankruptcy resulted in John
Hancock taking over the project, which retained the original design, architect, engineer, and
main contractor.
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