you should go through the listing agent they will be all about helping you put this together.undercapitalized investors get done in daily.. so if U are.. either ask for less downpayment and tell seller your putting 25k into a reserve account that if you don't use it for unforeseen repairs in say 24 months reverts to him / her as a credit towards the owner carry note..owner financing is dead simple..

Governments and, the courts, and the well meaning; seem to always fall victim to the law of unforeseen consequences that result from social engineering and regulatory overreach.

The variability of unforeseen rehab, missed calculations on ARV, extensive holding costs, delays in completion that become rather costly (especially if using hard money), market changes, permitting issues with the city, unknown title issues, potential vandalism/theft on vacant units, dealing with contractors & other trades that don't complete work to standards, or have to be fired, etc. the list goes on & on. 

I disagree with anything referencing "Free" as nothing is free in life :)  It takes hard work, determination and enough equity to cover unforeseen pitfalls.

I also give you a lot of credit for your insightful planning in the event of an unforeseen hick-up.  

This can help make sure deal is completed, even if unforeseen challenges arise.You should have at least two exit strategies:The first strategy is to assign the contract to another investor. 

Keep the cash in your pocket monthly for unforeseen expenses.

This protects all parties because changes can be the result of many variables (I.e. architectural design errors, unforeseen code compliance discrepancies, etc.) and can potentially result in neither the GC nor the owner footing the bill, if handled correctly. 

I'll obviously get the necessary inspections done, but I don't want to be blindsided by an unforeseen huge expense. 

The reason I still have it is because there was an unforeseen issue with installing a septic system that required purchasing a contiguous property which I just closed on last week.