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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 was President of the Second Continental Congress from May 24th, 1775 until October 19, 1777. He presided over the debates on Independence. His wealth very much ai â¦ ded the cause and fed many families through rough times during the Revolutionary War.