Coldayman pretty much hit on the double as a local vernacular. I did a whole thread of them one time, either here or at SSC.
Other 19th century types in Dayton are the "Urban I House", an urban version of a rural farmhouse, refigured to fit on tight city lots. Sometimes with an L or T rear, often with the door to the side. Also ones with the door to the front, and a shed roof one story rear addition.
Early versions from before the Civil War, maybe as late as the 1860s, two to the lot as this neighborhood built out during the walking city era, close to an water power district, thus increased density via doubling up on lots.
From the 1880s.
Maybe the 1870s
The ubiquitous "workers cottage", versions of this are found throughout the Midwest.
Rarer are a local version of the shotgun. Many of these are "sawed-off shotguns" that are not as long..this is a longer one...
Near the end of the 19th century and into the 20th one sees bungalows and foursquares, sometimes in serial production. This block is from the early 20th century...
These aren't really street scenes. The visual image of Dayton is that there is quite a bit of variety of houseform in the 19th century neighborhoods, but more repetivtive construction as one enters into the 20th century, with spec buidling becoming more common, I guess.
Dayton had a very strong building and loan association culture in the 19th century, originating a lending pratice called "The Dayton Plan". The result is that the city is bult out mostly in single famliy houses and doubles, with very few apartments or long rowhouses. There is also a noticeable transition from brick to wood as a favored building material, as one progressess through the 19th century.