Then I'd start thinking about giving them a bonus.  

I hired a full time Project Manager about 6 months ago to run my rehab projects with me (we used to use GC's for a lot of work, but switched to all subs after hiring my PM, the money saved with the PM more than pays for his salary and bonuses, not to mention my time). 

The tenant portion should be considered a bonus that you may have to work hard to get.

Count AirBnb as a bonus- not your only way to make the deal work.

It really won't make a difference regarding renter demand and if you allow storage the tenants will just fill it up with crap and leave it for you to dispose of after they move out.An additional bonus is that since you're in AZ it is more square footage that does not need to be climate controlled.

—For the past four years, New York City has tried to persuade landlords and real estate brokers to rent apartments to low-income people and homeless people with bonuses and pledges that rent would be guaranteed with government vouchers.The incentives have helped thousands of people move into permanent housing throughout the city.

I am not intending on factoring the appreciation into the equation at all, so when we do sell we'll be able to either take a hit or enjoy the benefits of a 3-6% appreciation as a bonus.

Also, given the narrow demographics of owner finance audience that you are looking for, expect this sale to have a slower and longer process compare to typical bank loan sale and if anything happens faster then it would be a bonus.

Bonus Question:  If you changed the above scenario to the following:A - No ChangeB - Down Pmt = 25% = $25kC - Cash Flow = $3640/yearD - Mtg.

Whenever I got a bonus or had saved some additional monies outside of my typical investing, I put a little more into this fund to try to buy another property.Along the way we were always trying to get smarter about our investing and improving profits.