Pretty sketchy information on this at the University of Oregon Libraries source. The undated photo is supposed to be the “Dr. Chapman house” originally at Front & Market, then Front & Sherman. Sanborn maps confirms this is the southeast corner of Front & Sherman. I’m pretty sure the apartment building in the background on the left edge is the same wavy-floored building shown here; roof details match and Sanborn maps show a 4-story “tenements” building at this location.