Is there lead abatement/remediation involved?

ServePro may be the solution for cleanup and mold remediation/removal, but you need to determine if the cost of such a service will be worth the effort.

The problem seems to have been remedied.  

I know going through legal remedies can be timely and expensive but this a huge burden to myself and wife as we are trying to buy our first home.We cancelled the contract and are working to secure another home now.Any thoughts would be appreciative.Drew

So basically plan was to tentatively use PT plywood, a sealer such as "Rust-oleum" & nail down some outdoor carpet to cover the ugly plywood.Dry Deck sounds like a solid option to remediate excess water moisture. 

And if you don't want to walk away (because you have a Lease Option - End Buyer in the home) what do to remedy?

When a Mortgagee is enforcing the remedies provided in the security instrument and note, it is safe to assume usually the borrower and mortgagee are not the best of friends.

What is the best way to structure the deal so the seller has to take responsibility for remediation and most of the cost to get it back to a basic habitable property?  

And do I have any remedy if he does it again?

I may be a bit conservative on the repair costs, however this particular property needs some mold remediation (basement), kitchen and bath updates and standard paint/carpet.