This marking is on a driveway facing the sidewalk, on the west side of the 300 block of Regent Street, between Michigan and Kalamazoo. It’s visible enough to be intriguing, but not visible enough to read. There seem to be two lines of text, with the bottom one more visible.
The letters that can be most easily made out are “JAM” and I think the next two are “IE,” which made me think “Jamieson.” Unfortunately, that clue didn’t end up unlocking anything for me in my searches. The line above it looks to include “DDY,” but that’s not much to go on. But I have come to realize it is probably actually the names of people who lived in the house at one time: the bottom one is probably just plain Jamie, and perhaps the other one is “Daddy” or “Buddy.”
I could not see the handprints with my eyes at the time, but they have become visible in this photo, which makes it very clear this isn’t a contractor’s mark but a memento.