I reduced my responsibility to only taxes/insurance while the tenant buyer does the maintenance, pays utilities and makes monthly payments to me. 

I’ve had people who signed up for 6 months and stayed 5+ years, paying increasing rental rates.

I obviously want to pay the lowest taxes over time.

If you have a buyer's agent, you should have already signed a buyer's representation agreement and that fee/commission is disclosed in that document so you should very well know what that charge will be.If you were the seller and going to owner finance the property, what would you want to see from the buyer that tells you that they will be able to pay the mortgage moving forward. 

Personally I wouldn't feel comfortable trying to wholesale a relatives $1M home knowing that I am breaking the law if I cross over into doing anything that can be considered representing them in the transaction, and knowing it will only be marketed to people who buy properties wholesale (typically investors who don't want to pay retail prices), instead of the majority of retail buyers active in the market who are typcially willing to pay more. 

both have 5yr pre pay penalty. 

He tells you to pay him $5,000 (or much more) to learn all the "secrets" that made him wealth, but then he doesn't tell you that his "secret" was to increase earnings, reduce expenses, save up and invest.

However while people in Windsor doesn't have the luxury of high paying jobs that GTA residents have, is it just a temporary fever of buying houses, or there is really something going on in this city ? 

A longer timeline will make paying the extra 2% now more attractive.

Risks: rates go down and you have to pay a prepay of 2 or 3 %; you have to sell and pay the prepay; rents decline & you can't make the payment like any other type of loan; cost upfront a little more than conventional; need to find experienced broker licensed in the state where subject property sits; servicers are bulldogs.