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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.
Immediately adjacent (across the entry courtyard, the original site of the John Barnard House) is the brick Pierce-Hichborn House, built about 1711 as an early Georgian house, and also operated as a nonprofit museum by the Paul Revere Memorial Association.