Creative financing, could anyone share some options?

[Dolores Waldron]

I have a seller who is interested in selling his two family home, 750K with each unit rented at 2,300.  I'm familiar with this area, he's a little high with asking so don't feel this is the price I would pay - more like 650K, however I don't have the 25% down to buy it with conventional financing (I have @10%) seller tells me he is open to seller financing, maybe that's why he has higher price point....but I'm not as familiar with creative strategies, any ideas on how I could structure this deal creatively with seller financing  and then pay him off at some point? 

Thanks so much for any input.

Dolores