Seller Financing On Property That Doesn't Have A Clear Title

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I was looking to wholesale a vacant property that I got under contract with a motivated seller that lives 4 hours away from the property. The seller acquired the property on a tax deed auction sale several years ago and now they are looking to sale. I got the property under contract for a great price. I turned in my contract to my title company for a title search. I got a call from my title company saying that they cant issue a clear title, do to it having a tax lien on the property and the tax lien holder is now deceased and didn't sign over their rights before they had past. I had told the seller this information and they are really trying to get rid of this property.

The property is not in terrible condition at all, it needs minor repairs and a good clean up. The home is the only vacant property on the block. I would be interested in investing into this property for my rental portfolio.

Can the seller and I , structure a seller financing deal on this property that doesn't have a clear title? Can we do a loan term that is over 30 years? A term that is infinity?

I know that I may not ever be the "owner" of the property but I feel like I can get a good cash flow out of it for many years to come. I am curious to know. If anyone has any advice or knowledge on the matter please feel free to share. 

Thanks.