So, with $100,000, you could afford properties totaling $400,000 to $500,000 in value.Number of Properties: You could go for one property around $400,000 or split your funds across two or three properties in the $150,000 to $200,000 range.

The property has a resort feel and would be a great STR. 

My advisor suggested that at my stage of the game, 8 properties, it likely made more sense to keep the extra money available or in the business to use as emergency funds or to accumulate for another down payment.

Property Type: Do you prefer residential, commercial, or mixed-use properties?

I have commercial property that I currently owe $141,000 through a SBA-HEDCO loan at 4.25%.   

TP spends 100% of their time in the asset management of these properties (not property management).TP has recently invested personally in these deals and owns at least 5% of Property A.

That may run you close enough to the price of an older single family house, so I opted for that property type. 

I think it is time for me to have a property management software of some kind to manage my long-term rental properties going forward.

If they've owned the property for 15yrs, probably a better chance of owner fatigue than someone only having it for 2 yrs.

@Lea RamirezDSCR loan probably your best option but you will need to show the property positively cash flowsIf it were me, I would be more focused I.