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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.
He was president of the Second Continental Congress from 1775 to 1777, when the Declaration of Independence was adopted and the United States was born. From 1780 to 1785, Hancock was the first governor of the Commonwealth of Massachusetts. He was reelected in 1787 and served until his death in 1793.