Since I purchased the home I made critical updates like new roof, windows, new exterior paint and landscaping.

The rental values of homes are the critical piece of the equation. 

The numbers are absolutely critical.

Having a good HML partner can be critical to your success when sourcing deals and needing quick capital to close.Good Luck!

Since in Riviera Maya there are over 400 pre construction at the moment, it s easy to purchase or sell but what s the quality, history of the builder, where I find an attorney and so on very critical.

I hear their land lords didn't drop everything and fix their toilet handles immediately either.Set expectations up front is critical, because if people know what to expect they are less anxious.  

They'd already made living arrangements and were so far along in the foreclosure process it just needed to be stopped (Subject-To).You're correct that always being honest and transparent with your clients is critical, but the deal structure is not always one size fits all. 

On a purchase mortgage where timing is critical, I'd encourage you to go with whoever already provides your homeowner's insurance and/or car insurance. 

Most people don't think of these, up-front, but they are critically important when things go sideways. 

My day job is a scientist so I'm always happy to take constructive criticism and I know there are strengths and weakness for any data or analysis.