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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 Financial. John Hancock Financial is an informal term for a United States insurance company which existed, in various forms, from its founding on April 21, 1862, until its acquisition in 2004 by the Canadian insurance company Manulife Financial. It was named in honor of John Hancock, a prominent Patriot.