Real estate Seller financing Lead

[Johnny Ruiz]

I recently ran into a lead where the owner is open to doing seller financing. The thing is he would like Have free rent until he passes(87 years old). This is hard because I would have to pay him monthly and take money out for a construction loan. Is their a way I can structure whereas his stay goes to the mortgage I owe him? Also once I get a promissory note between both parties will I need to present this to a lawyer?