Originally Posted by BridgeMan
I'd be inclined to rent or buy a moisture meter and take a few readings on the inside of the interior wall(s). If above 20%, walk away from the "deal," because it won't be much of one. Or be prepared to spend serious $$$ to make proper repairs.
This is going in the direction of
"Expected value of perfect information"
For what's riding on this, the OP may want to run more tests & make more measurements.
What is found ahead of time is the minimum number of problems.