But things happen.. for instance 2 years ago I had 3 of my borrowers die on me.

Try to borrow the $75k you think you need, or hook up with  a partner.

Any decent lender should allow you to borrow against your airbnb, without disturbing the original 2% loan.Example: I have a 6 unit that had ~$500K in equity.

It is a pain in the butt to borrow money in Mexico, so I look at everything as a cash purchase.

The borrowers could be paying their mortgage to scottsdale or scottsdale most likely sold the loans - when you invest in a syndication you have rights to manage the specific assets unless he gets a court order which there are also many other investors involved. 

In a purchase, it's declared by the borrower on the application.

Not much of a background check is done either on the transaction or on the borrower.

This is not the place to cheap out over a few hundred dollars.Lots of lenders and virtually all borrowers never read their loan documents.

That's useful for informing decisions.With respect to the interest rate: I do have a sense that borrowing at such a low rate can be viewed as an asset.

All too often I see folks borrowing against their 401k and then never pay back.