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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 the first to sign the Declaration of Independence and would later be elected the first governor of Massachusetts. He also faced accusations of financial mismanagement. Early Life. John Hancock was born on January 23, 1737, in Braintree (present day city of Quincy), Massachusetts, to Mary Hawke and the senior John Hancock, who was a clergyman. The elder Hancock died when John was a child, and his mother took him and his siblings to live with in-laws in Lexington.