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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 to sign the Declaration of Independence. He was president of the Continental Congress. He used large bold script and signed under the text in the center of the page. This is why, to this day, when you sign something it is called putting your John Hancock on it.