I’m not trying to be a jerk, but you’re joking right? You are renting below market, letting them live there and make improvements (or trash the place in the name of improvements) and considering that “a sale”?
I sold my house in a rent to own recently but only in a short lease period (under 6 months) because I knew the family wouldn’t want to move in and move out in that short of time while paying 2 months move in plus 2 months sec. deposit. That is motivation to buy.