However, the buyer's bank refused to fund the loan, stating they needed to conduct a full inspection—inside and out—to confirm the property still exists.

I believe the housing shortage is a farce - there is no housing shortage - there is an affordability issue and an inventory issue - but there is plenty of housing.

While opportunities still exist, I think they are still rare with interest rates and property values high.  

The average Section 8 rent for a 3BR house in Jax is around $2,000.

Purchase price: $78,736 Sale price: $115,000 Bought a house in Kenmare, ND that was freshly remodeled.

So you're going to have to do some research on the existing towns you're looking at to see where it's allowed and where it's not allowed.

Less risk because a house that is paid for cannot possibly be foreclosed on.

Pricing tools that exist on the market are decent, but you also need to know how to control it, otherwise, it will go nuts with unrealistic rates far out and extreme last-minute discounts. 

I'm trying to analyze my first property and not sure how to set it up to run the number using the calculator tools here. 2 of the units are successful Airbnb short term rentals, and the other two units are month to month rentals to existing tenants.

An example would be a $100k house that rents for $2k/mo.