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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.
â¢ Feb. 27, 1865 Hancock was named commander of the Department of West Virginia and the Middle Military Division: DC, West Virginia, Maryland, Delaware and Pennsylvania. He was to protect the Baltimore & Ohio Railroad, and guard against partisans & raiders like John Singleton Mosby.