The building above is the old People’s Drug Store at 7th and K St. NW (where it intersects Mass. Ave.) and below is another great photo of the building from the Library of Congress.
People’s Drug Store No. 1, 7th and Massachusetts Ave, N.W., Washington, D.C. (1922)
… and this is a photo of the interior of the store.
Interior of People’s Drug Store, 7th and K Streets, Washington, D.C., with employees behind counter with display of smoking products including pipes, cigars, tobacco, and cigarettes (1920s)