Seller Financing Attorney: Need Help with partial seller finance

[Allan L.]

Hi, I'm selling my property in Hawaii and have an offer from a nice family but they're pre-approved for 70K less than the selling price. I'd like to counter offer, offering them to finance the 70K they need. It should work since the property comes with a legal detached 2 bedroom unit that rents for about $2200. 

Are there any attorneys out there who would be able to help me make sure that the terms are clear and that we're protected legally. Thanks!

If anybody here has previously represented clients offering a partial seller financing please contact me A.S.A.P. please!