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Timeline. 1  1965: Plans for the John Hancock Center are announced. 2  1969: Construction is completed. 3  1972: The Hancock Center is surpassed by the Standard Oil Building (now the Aon Center) as the tallest building in Chicago.  1973: The residential portion of this building converts from apartments to condominiums.
John Hancock after the American Revolutionary War. Hancock was elected as governor of Massachusetts in 1780 and was easily re-elected for a second term. He took a hands off approach to governing and did not stick his neck out on any controversial issues. He surprised many by resigning in 1785, citing his failing health.