@Joe Splitrock I guess I wanted to offer some kind of remedy.

When we had a broken water pipe in our concrete foundation slab (will never buy another house on a slab - lesson learned) and the house needed water remediation we discounted our tenant's next monthly rent payment by the amount of the hotel stay after they provided the hotel receipt.

I intend to take the proper steps to have a professional find the source of the mold, test it, and have the mold remediated.

They may give you a chance to remedy it, or not.

If you create a single member LLC, you won't need a CPA as it is a disregarded tax entity and you will report it on your regular 1040.However, since Olmstead vs FTC, single member LLC are not very good for asset protection anymore in Florida (charging order is not the sole remedy).

It does not sound like there is a clear contract and hence the remedies are limited. 

If I were writing the offer, I'd evaluate the property based on the cost of this repair by either asking for a price reduction equal or greater than the price of repair, or for the seller to remedy the situation prior to close.

Just like these folks post on BP  hey I don't know anything about NPN I would like to partner with someone.. they are relying on that someone to run the show.. let me tell you I had a 4 hour grilling over this with a state financial investigator who was one sharp attorney.. and with my attorney we argued back and forth up and down.. but it does not matter.. the remedy is to take it to law court for 100k and see who is right the regulator or my attorney..

If they sue you for breach of lease you'll have documentation of attempted remediation of issues.

To me $10k for roof and mold remediation seems a bit low.