Wow! Has that been sanitized and scrubbed of anything interesting to look at! I was thinking of old machinery or a time clock or old records with incriminating evidence of misbehaving!
I actually didn't know that they clean them up like that before they demolish them - and I had to look up the term "grade listed." I have to wonder why? Perhaps because it was an important part of keeping the town running, once upon a time?
Not a lot in there, but you never know if you don't look! Grade listed, it's to preserve history.. and common sense cannot override the law.