An investor who is buying the duplex next to mine wants to trade a duplex he owns in a neighborhood nearby so he can have 2 duplexes next to each other (long story no need for those details). 

Maybe you saw this from the Tico Times already, but it lays out mostly depressing details on getting a mortgage in Costa Rica: http://www.ticotimes.net/realestate/25-mortgage-ti...Please post back here if you find anything!

Could you provide more details on how to get started with this approach?

So, is this something you'd consider, https://www.realtor.com/realestateandhomes-detail/10717-Kimb...?

The best advice I can give you for seeking counsel in online forums is learn how to ask specific questions and provide as much detail as you can. 

To address this I took detailed pictures from beginning to end of my most recent flip, documenting that we did a thorough job using quality materials.   

The biggest detail is look for a nationwide bank that is full delegated with little to No overlays.

If this were my property, I’d run a detailed rental analysis (from what I’ve read in Forbes) to see if the short term route could outpace traditional leasing.

If you don't mind, could you go into a little more detail?

Selling the convenience of the location first and in such detail may lead some renters to assume that there is something not so great about the house itself since the sale in on the location.