It's amazing how cheap it can get when you're paying physical cash and having your contractor pick it up at the warehouse.

Unless you are unknowledgable, my bet is you could make more from rent than sale, and still have the benefits of owning the original home while you go do something else.The 25K you have left in property will be netting you(gross) of $350 mo or 4200 per year.

If I sell one house per year, it will pay for itself.

@Jaycee Greene half off the sales price.

I do not understand your remark as related to the DSCR loan.  2 ADUs are not allowed by f/f conventional financing but is not always enforced.Fortunately if you stay with the current tenant without a refi, by the time you pay principle it is likely the rent will have increased enough to absorb the increase mortgage payment. 

Would a low enough sales price make all of my concerns go away?

They are two separate sales agreements. 

Less RiskWith traditional rentals, if your one tenant fails to pay, you’re in trouble.

If it doesn't work, put it up for sale when the lease ends. 

No need to pay big bucks for this.