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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 signed both versions of the Declaration of Independence. He signed the first one on July 4, 1776. That was the version that no other delegates signed. Then he sigâ¦ned the second version on or about August 22, 1776.