Cleveland's Batman

Remember a while back I was asking for any info about an old Batman mural painted on the side of a building in downtown Cleveland in the 1970s? Mom and Dad found it!
This photo (or, rather, the photo shown in this photo) was taken by Jim Marcus, "Cleveland's photo hobo", probably sometime in the 1970s in June 1982.

It's clearly not exactly how I remembered, but the last time I saw it I was maybe ten or eleven. We still don't have any information as to who painted it or why, but it is definitive proof that a giant mural of Batman did indeed exist in Cleveland in the 1970s.

Any insights, acknowledgements or anecdotes about it would be appreciated.