Square 507 circa 1880 map
This I found at the MLK Library's Washingtonia Division on microfilm, from the tax rolls, or tax survey, whatever. There was another frame with assessments that said what had a structure on it or if it were brick or a framed structure, but I was too cheap to make a copy. Cheap, or in a hurry or the copy part of the microfilm reader was screwed up. Any of those is possible.