The Ambassador Hotel is a six-story, 134 room single room occupancy hotel at 55 Mason Street in the Tenderloin district of San Francisco,California. The hotel was designed by Earl B. Scott & K. McDonald as the Ferris Harriman Hotel and Theater, and completed in 1911. An addition was completed in 1922, and in 1923 the hotel was renamed Hotel Ambassador. In 1929 the theater was converted to a garage.
The building can be seen in the movie Metro, featuring Eddie Murphy. Science fiction and true crime author Miriam Allen deFord was a noted resident from 1936 until her death in 1975. From 1978 to 1996, the hotel was managed by Hank Wilson, a San Francisco LGBT activist, who made the hotel a model for harm reduction housing. – Wikipedia