My deal details below.Location: Midwest, mid-size town with a number big and small companies, hospital, heavy summer tourism.

Commercial RE is on deep recession, some financial company like regionals are collapsing.

I pay $4100/mo not including utilities. 1 year appreciation according to all 3 real estate websites zillow, redfin, and realtor.com, my house is worth about $645k.I've been house hacking by renting out my additional 2 bedrooms to mid term rentals (usually 6mo stays) and brought in about $9k for the first year.

If you want to target displaced families for example start making connections with insurance companies.

I've gone through eviction court proceedings, ran thousands of background/credit checks for application, made numerous leases, dealt with repairs and whole house renovations when a few tenants nearly destroyed properties, and worked with property management companies on the HOA units. 

The problem with PMBs (Private Mail Boxes) is if the company goes out of business or you wish to use a different option USPS doesn't allow you to forward your mail out of a PMB address.

So you should have a flipping arm to your REI company. 

In my Lease Contract with tenants, the Lease says tenants are responsible for paying all of their utilities, including water.  

I also welcome perspectives on utilizing a HELOC, other financing options, or keeping my primary mortgage-free.

Multiple, billion dollar companies are investing substantial amounts of money into our area, such as Intel, Google, and Amazon.