We are about to put in $15-$20k of our own money into it, beyond what insurance covered and I need help deciding how we should finance it. 

Purchase price: $98,500 Cash invested: $15,000 owner financed on duplex, bought from a friend of the family. hopefully many more to come

The owner is open to seller finance for us.

Two separate property appraisers (at the direction of the lender) were sent out to appraise, and neither was willing to appraise it as a "residence", and thus financing fell through (conventional primary loan).

@Brice Alef-Torrisi To manage finances for multiple properties, maintain separate bank accounts for each property if held under different LLCs to avoid commingling, which could jeopardize liability protection and complicate tax deductions.If properties are under one LLC, using a single account is fine but requires detailed record-keeping for each property.

If you’re offering $450K, then you could offer to take over the $120K payments and seller finance the remaining $330K.

I would like to learn more about seller financing, I see a lot of information on the internet about seller financing but honestly I am just confused.

I work out of my basement and have been trying to find a location near me that rents out individual offices. 

Does anyone know of any banks or lenders that will finance the purchase of commercial real estate notes?  

There is a difference between newbies trying to do creative financing deals and actually doing them.