His son, Charles, took over in 1874, moving the business a short distance to 19th St.  2040 I St. is not owned by George Washington University, the only structure on the block which is under different ownership.
His son, Charles, succeeded in 1874 by relocating the business to a nearby location. 2040 I St., unlike other structures on the block, does not belong to George Washington University and thus represents unique ownership.