The commercial real estate website loopnet has a retail listing for 457 Massachusetts Ave NW. This address is a narrow rowhouse building between Buddha Bar and the turreted corner house occupied by the House of Ruth. The description offers a whole building opportunity for 1920 SF.
The property is narrow and not particularly deep. So the floorplates, as shown in the brochure from the Rappaport Co, have limited contiguous square footage. It might be best suited for service retail (salon?) or offices (law or dental?).