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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.
The outline of the John Hancock appears on the Illinois version of the quarter-dollar coin, minted in 2003. The John Hancock Center was only the third building in the world to be taller than 1,000 feet tall and the first outside of New York. The first two were the Chrysler Building in 1930 and the Empire State Building in 1931. America's highest indoor swimming pool is located on the 44th floor near the skylobby.