Many basement access doors are not 36" wide depending on the age of the property.

Nation wide we are still a long way behind on numbers of homes needed. 

With @Michael Baum on this.Another angle of thought - who would have a better chance of success challenging Airbnb TOS:1) A "brand" with 5 units2) A brand with 500 units?

But a wide ballpark would be around $800-1200/mo long term or $1500-2000/mo as a short term rental.Understanding Zoning Requirements for ADUs in Raleigh. 1.

English is widely spoken in the Guanacaste region.  

The setback requirements to build in my county require 80' minimum wide street frontage per this neighborhood zoning.

Others rely on networking... hooking up with probate or divorce attorneys who sometimes have leads on properties that aren’t widely marketed.If you decide to hire a property manager in the Jasper area, maybe chat with a few owners who’ve used them.

So you could also approach it from that angle. 

With fully paid-off properties and significant equity, your options are wide open.I had a friend in Connecticut who ended up investing in Phoenix and he was in a situation much like yours - an inherited property and equity to work with.

They are based out of the Smokies, but will ship nation wide.