Seller financing a Duplex

[Marc Shin]

I found a duplex that is FSBO for $300K. It's been on market for about 180 days. I'm considering reaching out to the owner for a seller finance deal. Any recommendations on how I should structure the seller finance deal? I was thinking about putting down 10-20% in cash and then seller financing the rest at 5.0-6.0% interest rate over 30 years. Does this sound like it would be appealing to the owner? Or would I need to offer a higher interest rate on the seller financed debt?