Seller financing wholesale deal with property liens

[Matt Allen]

I’m working on purchasing a property brought to me by a wholesaler. 

Seller is willing to do seller financing. But the property has $15k in liens on it. 
Since it’s seller financing, the seller doesn’t want to take care of liens yet. 

But the seller will put in writing that the liens will be paid off if property is sold or refinanced.

I’m thinking it’s not worth it and to walk away at this point. Thoughts?