Could you be looking at $30K worth of demo, special permits, asbestos and lead based paint remediation.

They installed some large hemlock beams to remedy the situation but without addressing the slab as a whole its a short term fix.

And, he is a licensed mold remediator.

Repairs- 100k (with buffer) Has an easement issue, spoke with attorney there are a couple ways to go about to re-mediate.

Find as small area to test remediation and remove a piece of the drywall to see what the damage is.

Other times (layout/parking for example) you'd have to spend more than the property is worth to make it even moderately appealing to a renter or buyer.If you're in a fast-moving market, then I'd expect places that have been sitting a long time and have had price drops to have problems that are very hard/costly to remedy.

If it's in your lease, enforce it which means you can institute a fine or evict them or whatever remedy you have in the agreement.

Then get some other evaluations and estimates.If the conditions merit remediation, use a plumber you trust to make the repairs.

It becomes a nightmare if you have to hire professional mold remediation companies, because most of the time they have the gut the house. 

The PM verbally stated no charges would be due after pro-rated rent was paid & tenant moved out.The PM company billed the widow for damages for cleanup by a remediation company.https://bit.ly/2wR9PXu