So the Property manager is making 60%+ of what you make as the landlord (speaking in straight cash flow terms).

I would be less concerned about the cheapest money and more concerned about decent terms and execution.

But, if steady long term cashflow is a goal, with no management, one can always sell farm land on a low down private contract.

If a mortgage has a deed restriction, not allowing short-term rentals that is not imposed by an hoa or a city government how hard is it to get it removed?

I wouldn't bet my life on 50%, but I would bet they are more problematic than the typical long-term renter.

When I add a new tenant to the lease, the original contract terms remain in place.

The rent-to-price ratios in many neighborhoods are strong, and the city’s population is finally growing again after decades of decline.One thing that stands out to me is Detroit’s median home price—around $95k—which is far below comparable cities of its size in terms of population.

Some thoughts on your situation overall:In terms of vetting, I personally there is a limit to how much you can mitigate risks when working with a smaller contractor.

Start by leveraging what you already have—consider tapping into equity through a HELOC, house hacking again with an FHA loan, or increasing cash flow by converting a unit to a short-term rental.

In making this post here on BP, I wanted to humbly come to the forum however and start from scratch in terms of idea generation as to any and all avenues to pursue in getting the word out there so as to not miss any options.