I'm agreeing with a lot of the comments. Thanks!

At this point I've had conversations with the owner, told them I had concerns about the property historically being commercial and now they want to convert it into residential. Told them they need to make sure it is properly approved with authorities... They hadn't thought of that!

I talked to my inspector describing the situation. We talke about the fact that if they don't have rated firewalls between parts of buildings, even though they want it to be residential it's got to be wired with commercial methods, no romex. That's ok, because I can't fish the walls anyways and was planning on surface EMT.

Working on giving them a number.
We'll go from there.