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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.
George Washington selected the site in 1791, and as president laid the cornerstone in 1792. Washington was then running the country out of Philadelphia. Slaves did participate in the construction of the White House. Records show about 400 payments made to slave masters between 1795 and 1801.