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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 signed it on July 4th 1776. However, Second Continental Congress did not sign it until August 2nd 1776.     Not all of the delegates to the Second Contâ¦inental Congress signed it on August 2, 1776.