@Alan Jones, there are several avenues you can investigate re your financing options; portfolio lenders, seller financing, private money. 

In the past, I hired a private investigator to locate this information for me.  

After a bit of investigation i found what I guessed was the current address of the owner.

I believe he is being investigated for fraud currently and has pending legal actions against him.

Certainly worth investigating closer

It actually kills the smell producing bacteria.I would also suggest that you investigate and determine specifically WHERE the residual smell is coming from.

@John Barr Thank you for your investigation, What is the price range of the properties in these zip codes?

I hope these responses provide enough insight to direct me to investigate a few directions.

Additionally, upon further investigation, it was revealed that the valleys underlying the tile roof are in need of repair and/or replacement soon. 

Now, keep in mind that the deal is, you sold me a contract to buy, that means with good title unless otherwise disclosed.I'll sure be looking at you if I bought your contract and in 3 or 6 months (whenever) I can't buy for any reason other than default of the seller and even in that case, the deal may be investigated to ascertain if that contract was good.