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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. He wrote it very large so the king wouldn't have to put on his spectacles to see. As president of the Congress, John Hancock was the first to sign this historic document. The absolute first signers were John Hancock and Charles Thomson, Secretary of the Convention and they were the only two who signed that first document.