NC and SC have some great markets for short term rentals and you would definitely increase your wealth by splitting the money and buying multiple properties.

I currently own three rental properties and a primary. 

I’ve got a single family townhouse long term rental.

My family owns a plot of land with a rental house (that my brother rents out).

The cost of the mini split is going to come out of your rental profit, so will any repairs that are needed over the years.

To start, I'd do a Discounted cash flow analysis and cap it like a regular income producing rental....do you know the rent the tenants were paying in the two sales you showed?

Looking at two potential ways to buy real estate for long term hold rental. property A assume the loan on a property with no equity at 6% interest rate.

Here are some things to consider:Most investors don't need software until they have 5-10 rentals.

Here are a few I recommend: "Rich Dad, Poor Dad" by Roberto Kiyosaki; "Set for Life" by Scott Trench; "The Unofficial Guide to Real Estate Investing" by Spencer; "The BiggerPockets Ultimate Beginners Guide" found here on BP; "The Book on Rental Property Investing" by Brandon Tuner.

BPO and comps show ARV at 480k based on rental income.