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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 the first man to sign the United Statesâ Declaration of Independence in 1776. Knowing that signing this declaration could mean his imprisonment or even death, John Hancock boldly wrote his name in large letters, declaring, âThere, I think King George should be able to read this.â.