well I got to go inside for the first time today (my husband had already checked it out.) He made it sound like an absolute pit of despair, so I was expecting the worst. However, I was pleasantly surprised!
Check out some of the pictures here: https://goo.gl/photos/DVmhpWaTMbW2VS2LA I somehow did not get pictures of the outside... oh well. Next time.
The basement was as bad as I was expecting, so I wasn't worried about it too much. There is some water damage in the kitchen and bathroom, but that's about it - The gutter had basically fallen off the back of the house, so we know what the cause is.
It's surprisingly clean for being vacant for 4 years. We'll have to haul all the crap out of it, but it's definitely not anywhere close to some of the bad places I've seen on BP. Thanks everyone for help putting it into perspective.
We do have to redo all the wiring - it's glass fuses and there's no meter. Luckily, because it's such a tiny house, the whole rewire will only cost $1600.
The furnace looks good, and randomly also has a whole house humidifier installed? Not sure how I feel about that. We're still bouncing back and forth on adding central air. We should have a dumpster there by the weekend, and officially have the deed by Friday.