I just want him to realize that I will fight for my property tooth and nail.

@Andrew Johnson you hit the nail on the head. 

@Jason Bott - Nailed it. 

(Good sound insulation, doesn't get eaten by termites, etc)If you're asking about how to make it look less "dorm room" then you simply can buy some furring strips (1x1, or 1x2) attach them to the C.Block with liquid nails or actual nails, and then go 1/2in drywall on the furring strips.

@Jack Medford With you living in Madison and investing in Milwaukee, my initial advice is to nail down the property management company that you are going to work with. 

Roofing shingles shouldn't be put down in winter because they don't properly "bond" and the nail holes won't seal.

@Paul Thompson hit the nail on the head... you must begin with your WHY.

But I think you hit the nail right on the head, "maximize it without being excessive".  

I keep saying usually because you may get a hard butt who nails you.

If that is not the mindset of your buyer, you might be dealing with the wrong buyer.Brandon nailed it, what he said is exactly right.