Any additional thoughts?

If you “invest” an additional $1,000 through negative cash flow a year, but it appreciates $10,000 a year, you are getting a 10x return on that money not counting any other benefits you could receive.

I would be happy to give my insight as you get it narrowed down.

In addition, it ensures any required repayment of any assistance provided by NACA for the mortgage payment. 

If the property they are purchasing is greater than what they sold then anyone can take title to the additional percentage as a tenant in common. 

I suppose just finding a handy person who's willing to take calls, or be "on call" from tenants, maybe for an additional "on call" fee, and a decent cleaner.

In addition, there is a separate issue if you lost your principal investment.

But I began this reply with IF, because if they are all cash-flow positive, I would personally not seek to pay any of them off early (depending on your age), and instead save that money to put towards obtaining additional properties.

Could you provide any insights or recommend a realtor specializing in STR investments in these regions?

I think since the tax year still benefits from the 80% bonus depreciation, taking a few extra thousand in bonus isn't worth the risk of additional scrutiny by a tax court.