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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, the Bishopâs grandson and future President of the Continental Congress, was born in Braintree (now Quincy) Massachusetts on January 12, 1737. He was the son of Reverend John Hancock and Mary Hawke Thaxter. His father, the son of the Bishop, was born at Lexington in 1702 and graduated from Harvard in 1719.