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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.
Born on January 23, 1737, in Braintree (present day city of Quincy) Massachusetts, John Hancock inherited a thriving trading business in Boston and would, with Samuel Adams, become a major figure in colonial agitation against British rule.