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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.
But that may not be how it happened at all. At the time of the signing of the Declaration, John Hancock was the President of the Congress. When he signed the document, it's possible that he thought his signature was going to be the only one on the document.