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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. John Hancock (January 23, 1737 â October 8, 1793) was born in Braintree, Massachusetts to a minister. As a boy he was a casual acquaintance with the young John Adams. His father passed away in 1744 and he moved to the home of his Uncle Thomas Hancock.