If you generate enough money annually to dismiss a W2, then consider covering the ever increasing costs of retirement & health care and those do not go at inflation metrics but usually way higher. 

Find a great real estate attorney to help you with:1) Putting a lien on the property, with your aunt's consent, to cover any work you do.- Ask the attorney if your aunt & dad need to authorize lien, or just aunt.2) Understanding your options to force payoff of the lien.- Ask attorney how you can enforce collecting on the lien when you need to.3) Getting full control of the property, while allowing your aunt to keep her ownership.- Have attorney draw up a contract to do this.Suggest you offer your dad some cash, now or in the near future, to motivate him to transfer his ownership to you.It may not work out, but you will learn a lot either way!

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

Assuming the ARV you mentioned is accurate, at 75% LTV you'd be able to pull enough equity to cover your existing payoff, refi costs and walk away with a good chunk of cash in your pocket.

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

This is because they're much more expensive than other countries in the region and, unlike in some other countries in the region Costa Rica doesn't have the mass tourism needed to get you the rental income that would justify those prices.This being said, it shouldn't be hard for you to break even though since all you'd need to do for that is cover your costs.

Just make sure to adjust the rent enough to cover the average utility costs and include it clearly in the lease terms.

More and more insurers are refusing to cover disaster-prone locations.

Or if they were rentals the losses may have been covered up by the Ponzi scheme.

Living in one side and renting out the other will help cover your mortgage, and after a year, you can move out and keep both units as rentals.