Investor buys in a  market that has poor fundamentals and is stagnant.

Closed-end private equity style offerings generally have very different liquidity profile than a private credit fund (or interval funds), where the investor lock-up period is generally longer, with most of the returns being generated at exit (or back-ended).

I have great credit, killer salary, and a bunch saved up but still can't afford a 20% down payment on anything over 600k. 

If you have decent credit (north of 680), you should be able to get 75% loan to value, assuming the DSCR is met (usually a 1 to 1 measurement between the PITI and the Gross Monthly Rental Amount).

Unfortunately, appears you've gotten exactly what you deserved due to your poor screening.Hopefully, you've learned from this painful lesson.Hire a well-screened landlord-tenant attorney and evict them and sue for damages.

They also have accountant access to my bank accounts and credit cards, so everything gets reconciled.

But... you made so many mistakes:(1) No Personal Guarantee: try getting a loan of credit card for an LLC.

If they had 10K they'd probably buy a house- most renters are poor.

Growing up, my mother and I were renters, and I vividly recall the gratitude we felt when a landlord took a chance on us, despite my mother's imperfect credit history.

Moreover, you can credit what you paid to Mexico against your US taxes so, depending on your US tax rate, what you pay to Mexico might end up making no difference to you because you'd have to pay to the US what Mexico doesn't charge you.