I didn't find him on the side of the building, but I found something else. On the back of the building facing the alley was a nice 'ghost' sign revealing the location's heritage as a Studebaker dealer.
And while returning to my car, I noticed another indicator of what kind of brand of car Colgan Motor Sales sold there.
You see this kind of thing in Cleveland all the time. Here's a link to a Philco sign that was discovered back in 2008.