Funding a Rehab for a seller financed deal

[Tristan Bulot]

Im in the process of getting a distressed duplex (small fire) that someone has started to flip. Its been sitting vacant and costing him money so I called and pitched a low cash offer and then a higher seller financing option. It sounds like he will bite on the seller financing option to recoup some capital he has in this property.

The deal structure would look like this: $100k seller financed with 0% down at 8% apr amortized @ 30 yrs w/ a balloon payment due @ 1yr (3 month rehab time, 6 month refi) ARV @ $240k. I am estimating rehab costs being at $55k.

My question is what are some ways I could finance rehab costs? I feel it may be hard because it will be hard to secure their loan since all equity is still with seller.

any thoughts, advice, or ideas very appreciated!