Then, once you treat/fix the problem, you just need to take some basic steps to prevent them from coming back (i.e. eliminate any areas of wood-to-ground contact, address any moisture issues, etc). 

@Donovan JamesHere is what I typically ask/look for in a house-Age of roof-Age of furnace-Age of water heater-is the electrical updated-Check for any major cracks in the foundation-If you are flipping the house see the age and condition of all windows-Check for moisture and mold in the basement-Check for any large cracks in walls-Check all ceilings for water marksYou may also be able to find a check list of things to check in a walkthrough on google.

Moisture / water / mold, knob & tube wiring, foundation issues, ancient plumbing, rust on the breaker panels, termite tunnels, powder post beetle damage, cedar post supports, improper footings, temporary lally columns, etc.As to writing an offer, that's a sensible and common approach. 

I would not touch a property like this, but if you really LOVE it, check with a crawlspace encapsulation company(if they exist there) and get a price to stop moisture rising from the ground and rotting your wood subfloor

They seem to believe that all of this moisture damage is related to a lack of proper guttering on the sides of the house.

.• Moisture is present in the soil under the raised foundation.Due to the amount, we recommend all the post and pierinspected for signs of settling.Page 14 Item: 7 FoundationPlumbing• Plumbing- Main drain line.

Definitely needed more like $100k plus of rehab as well - moisture issues throughout, zoning wasn’t right.

For example, moisture invasion gets more expensive the longer you wait and some improvements have a longer payback than others.

Fix the moisture.

Either poor grading is giving the water a path, or hydrostatic pressure from ground moisture is to blame.