Owner Financing Question

[Joseph Duenas]

Hello. I am purchasing a house for $210,000. I got the owner to agree to owner finance this to me. I will pay $25,000 down, and his mortgage payment of  $1900 per month. There is a balloon due in 18 months. My plan is to rehab this place for about $50K and sell it. 

Question: How should I structure this in a purchase agreement? Should I use a title company? Should I record the purchase agreement with the local government? I just want to make sure I"m safe as I will be giving him $25K and putting in $50K renovations.  Looking forward to your feedback!