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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.
175 E. Delaware, Streeterville, Chicago IL. Built in 1970 and quickly becoming a beacon of Chicagoâs innovation and style, the John Hancock Building, 175 E. Delaware, stands 100 stories over Michigan Avenue and offers 703 of the most luxurious Studio, 1, 2 and 3 bedroom condominiums in the highly sought after neighborhood of Streeterville.