Over time, as rents rise and your margins improve, a good PM is worth their weight in gold. 

Now, I have more than a hundred doors.

Detroit's population is actually growing according to recent surveys not shrinking Census Bureau estimates: Detroit population rises after decades of decline, South dominates growth (michiganpublic.org)2. 

I am out of state and don't know a lot about the Jacksonville market today.The property also has firepit in the backyard, smart door lock, cameras, thermostat, and router installed.

Rates rise significantly when you are doing a MTR.

Even if appreciation is the same across the board, 3% appreciation on $1M asset or $3,000/month rent is a higher dollar amount than something on a $100K asset or $1,000/month rent.Between my house hacks and partnerships, I'm up to 15 doors (including my personal residence) where the last time I did a down payment was in 2015.

New supply and rising expenses are probably even more impactful.Florida has some of the most new construction going on in the country, and is seeing rapid increases in insurance costs.

On the other hand, if you find a supply vs demand imbalance in a cheaper market, prices and rents can rise unhindered. 

This is going to mean more homes closing faster and more closing means more comparable sales to trigger a rise in homes prices.

We turned a SFH into an up/down duplex by framing in a locked door at bottom of stairs and adding a kitchen to the lower unit.