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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.
Of the convention, which, about this time, was appointed to frame a constitution for the state of Massachusetts, Hancock was a member. Under this constitution, in 1780, he was the first governor of the commonwealth, to which office he was annually elected, until the year 1785, when he resigned.