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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.
Publisher. A+E Networks. On this day in 1775, John Hancock is elected president of the Second Continental Congress. John Hancock is best known for his large signature on the Declaration of Independence, which he jested the British could read without spectacles. He was serving as president of Congress upon the declarationâs adoption on July 4, 1776, and, as such, was the first member of the Congress to sign the historic document.