buying land and house

I have posted earlier about this. I am trying to buy a piece of property for $102, 500. It is a double wide upgraded mobile home on 18 acres setup just the way we want it. The owner lives out of state in tx. The place used to be his mothers. He is paying the payments. He is in a 10 year mortgage that is about 4 years past. Things have been happening that has made it tight and I believe desperate financially. I believe that he is being eaten alive by the payment. There is a problem with conventional financing on my end that has stopped us getting it the normal way. Is there a lease purchase that lists interest amounts? Like 100k at 7% for 30 years? He is not able to pay off the loan to do a normal owner finance. Is there any way he can break it if he finds some one else to sell to later?