This photo matches the number of window openings (about 22 or 2 per stall) that are present on the extant structure. They have all been bricked in and stucco finished. (see Google Maps - Street View). Photo is not dated, but written on it is: "The Roundhouse During Construction.:=" Photo also is found in the master plan. Source of photo is a link on city web page: [http://www.tucsonaz.gov/projects/elpaso ]
(submitted by Rich A. on 03/02/14)