Hey Mayer,Are you managing long-term rentals? 

BUT, the terms will be worse but an option if the above does not work.  

Do you need a cash out or just a rate and term refi? 

Here are the options I thought up:Option 1: Save up money for a few more years until I have enough to buy a place all cash from a wholesalerOption 2: Aggressively pay down one of my mortgages (~$440k left at 6%) and cash out refinance in a few years to buy a place all cash from a wholesalerOption 3: Buy another house hackAll 3 of these will require me to put my value-all dreams on hold for a few years.

Given that the house is paid off but has $27K in back taxes, you could offer to cover those taxes upfront in exchange for favorable terms on the remaining balance—like low (or no) down payment, and small monthly payments.You could also negotiate for a subject-to deal where you take over the property subject to the taxes, while still securing control of the property for your BRRRR strategy.

However, understanding all the costs of buying a real estate investment property will help you avoid costly mistakes.Buying a rental property, holiday home, or property to flip can yield short-term and long-term financial gains.

They will provide detailed pro forma's on properties, do analysis on your behalf, have trusted vendors, and put deals in front of you.A crappy RE agent will put you on a drip campaign and tell you to get a hold of them when you see something you like.  

Nor does this method apply to buy and holds, MFHs, MHPS, or anything else unrelated.

I'm exploring the idea of investing in a short-term rental (STR) property abroad and have a few questions regarding how to structure it for tax efficiency.

The stays at your property are mid-term, but for repeat business, you want to cultivate long-term relationships.It sounds like you are well on your way to doing that.