With the information you provided and that of what was accumulated through google, it looks like there is no exact way to come up with a value. 

Most real estate seminars tend to be pep rally sessions to motivate individuals using various psychological techniques more than providing information and insights based on research that you can't find elsewhere.What seminars have you attended where it did not feel like blowing smoke up your glass?

We found a septic issue after closing because we didn't inspect.

I'm happy to share my experience with this market if you'd like to message me to set-up a call. 

The owner has been letting an undocumented family live there and try to fix it up at the cost of the family and charging them rent.

We are closing similar loans to this one in 2-3 weeks. 

The people telling you to stay away from Greenville are closed minded individuals who don't like growth and change.  

Financing for 5+ units is not very good right now, however there are ton of lenders including myself than can fund up to 75% LTV on a 1-4 unit property. 

The buyers have been paying on time and have not missed a payment since the purchase closed on 7-26-21.

We rented a STR in Hawaii and ended up buying rat traps because "that area is know for rodents".