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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.
If the Hay-Adams has a weak point, it's the rooms: They don't quite match up to those of its competitors, at least in terms of size. (Nearby, the Jefferson and St. Regis come to mind.) Because of the building's structural limitations -- it was built in 1928 -- the rooms are relatively small by modern luxury standards.