Bill Gulley, I still don't see the problematic issue here. Not trying to argue, but I don't think I 'get it.'
Original scenario: Buyer will buy for $85k, bank will give conventional if buyer puts 25% down. Bank carries 64k. Seller gets $85k - closing costs. Problem: Buyer doesn't have the 21k+closing costs and the deal falls apart.
Seller financing scenario: Buyer negotiates seller financing with seller. Buyer will pay $93k, get same loan from bank, and ask seller to carry back $16k with some fair interest rate higher than whatever the bank will give on the 1st position loan since it's riskier. Seller receives $77k - closing costs up front, and will be paid additional $16k + interest over the term of the loan. It seems like a reasonable risk/reward, no?
I'm not sure what you're talking about with zero interest rates, note amount higher than ltv, etc... Interest rate would have to be higher than 1st position, the notes would be 64k + $16k and just say that $85k is the market value. Yeah, it's higher LTV, but isn't that the point of seller taking a second? Buyer doesn't have enough money to make the down payment without the 2nd loan. To my knowledge, most states' adopt a version of the SAFE Act that has a carve out for seller financing, unless you go above a certain amount of transactions.