Question for note buyers

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I am negotiating on a seller finance deal to purchase a package of SFH's. We're looking at 30 years, 3% on 350K. Owner is a bit older and I think is a bit nervous about the seller financing. I am trying to calm his fears and thought about doing a little education on the fact that he could sell the note. What are some things I can tell him to get this deal through? Is this something someone would buy? And if so, at what discount? Also, what do you look for as far as seasoning and LTV?