I heard it cost $100 filing fee so I didn't want to waste money if I didn't have to. 

In order to encourage tenants to get renter's insurance, we have been contemplating instituting a $50 monthly fee until they provide proof of renter's insurance with the owner listed as an additional insured, but not sure how well that would hold up if we ever had to evict. 

Looking at ideas on how to structure the deal to the landowner  to get the land aquired and infrastructure installed.

I think I'm going to install one way air flows in the complaining tenants bathroom vents.

When you add up legal fees, lease fees, loss of rent, etc. it can add up.

Confirm that the warranty applies to the type of property you own and consider whether the annual cost and service call fees make sense compared to just handling repairs yourself or using your own trusted contractors.

I understand that rents will go up over time and my mortgage payment will pay down the principal, but it seems like investing the $1.43mil into rental properties and/or a low fee US stock market fund may work out better for me. 

You need to find people who love Costa Rica and would love to own a property there but are hesitant to buy a property on their own where they will need to manage it, and take care of it, and pay for the maintenance and any other fees associated with it.  

@John BerjIf cash flow is a top priority, factor in HOA fees (common with new builds) and confirm rent comps to ensure the numbers work.

This is probably a question for your personal CPA or if you don't have one, paying a consultation fee to a Real Estate centered CPA would be a good investment.