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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.
U.S. #1935 â After the White House was destroyed during the War of 1812, Architect James Hoban oversaw its reconstruction. The cornerstone of the building was laid on October 13, 1792. Some accounts claim President Washington was present, while others claim he was in Philadelphia at the time. According to tradition, the cornerstone was laid by Hoban and a group of freemasons.