I talked to a realtor that I trust on these issues. She said it is valued at 50% of main floor if finished nicely, but even with that it's hard to get your money out.
Bill Gulley- Yes, there is a deck off the back, and the shaded patio area below. ARV will be no more than 300k.
Jim S- I've never done an apt either. If I do go that route, it would be minimal kitchen, so someone could see it as a rec area, or a mother in law. I don't want it to have a duplex feel.
Wine cellar! too fancy for this place. I will post some pics (not that I know how) next time I get over there.
Mark Yuschak- There is already a bedroom with closet and window. There is also a non-bedroom room (no closet or window) right next to it. I might make it one big bedroom. It's all covered with fake wood paneling, so will need to drywall everything anyway.
I probably could push it to a 5/3, but I wouldn't want to list it that way.
This is good feedback. I'm obviously going to make my main focus the above ground level and curb appeal. I think I'll have 10-15k for the basement level, since the rest of the house is in such good shape.
The basement needs at least 3k for demo, clean up, paint which would add virtually nothing to the sell price. So, it seems worth it to spend 7-12 more for 20-40k in extra value.