While there is an incredible amount of filth in the house, that's not an especially expensive undertaking. All it is is a bunch of garbage, a lot of grime, and maybe some shot wiring here and there, it's not like there's a crack in the foundation or a hole in the roof. Looking around I would estimate that the total cost for dehoarding would be less than 10 grand, and less than 2 grand for any rewiring, and combined that with some other random expenses and I'd say $15000 is the max renovation costs. The house is in good shape due to being rebuilt after thef ire, and would probably sell for 220-260 thousand after those fixes.