Dear Daddeeo,
Open any high school year book from SMR or Cooley and in the back you'll discover ads that supported the publishing of that year book, and many of them will have photos of their establishments, circa whenever. On a related theme, I recall a shoe store near [[or on) the corner of Longacre and GR that displayed Lionel railroad sized billboards for first run films appearing back in the early 60s, and these billboards were sponsored by United Detroit Theatres. I love to find out what happened to them.