I had a remediation contractor come out, and he told me the levels on the report is what he'd expect from a basement in Portland, and any amount of washing / bleaching wouldn't reduce the levels much long term as more moisture would enter the space up from the slab because concrete will always give off some moisture, and he couldn't really recommend much remediation. 

Most of those deals fell out, but we were able to get price reductions/remedies for others based on the findings.

This is really disappointing because I am ready to purchase another property today but will not get approved or have horrible loan terms due to a 640 credit score.Does anyone have any recommendations on how to remediate this issue?

So, if your bathroom was un-permitted you may be required to remedy that issue with this renovation.

Landlord shall have the same remedies for the collection of such costs as Landlord has for the non-payment of rent under this Lease.

What are the PRACTICAL remedies if he does indeed decide not to sell or show up at closing.

I grabbed snippets pertaining to your particular case and listed them below.Utah Courts Three Day Nuisance Notice"A three-day nuisance notice does not give you a chance to remedy a problem.

Insurance won't let us bind until they are remediated and the seller is not willing to help.

Mold remediation and water infiltration were our biggest obstacles.

If you have further questions, call your insurance company, they will be able to give you some insight into your liabilities since chances are they will be representing you for a mold claim.Lastly, you can call a remediation company for a quote.