Biographies of American Seedsmen and Nurserymen Sibley, Hiram–Rochester, New York; Chicago, Illinois–succeeded the Briggs Brothers seedsmen.  Sibley was one of the founders of Western Union.  The 1882 catalog described in detail the new building they had built for their company in Rochester.  It was nine stories and had three elevators.  He also continued the business in Chicago.
Sources: NYPA