It may be possible to do a piggy back as I suggested above where part of your mortgage is regular Amortization as you have now, then part of the loan is a HELOC that is interest only.

Some tenants in a regular lease and some month-to-month.  

Several providers that post here regularly can help answer questions and setup such an account for you.

I enjoy finding and getting the properties ready for guests, and find it more lucrative than "regular" long term rentals.

They regularly come in at 10%+ less than value based on average sold 2) The ADU value is not well understood as it will apply to appraisals and that is because current rules require it to be owner occupied.  

But I want to keep good files on each villa and schedule the regular maintenance we need to do and set reminders. 

The commission belongs to the broker, then pays you based on your independent contractor agreement.The commission received, even if you are applying it to the property is still earned income like your regular commissions.I dont do it because I maintain my rental property business as a distinct business separate from my agent business.  

My main focus these days is anything that makes money :) - really I find regular single family deals so they are the bulk of my purchases.

@Amir GiryesThere are some banks in US that will lend to foreigners, however this will be an equity loan, you wont be jumping hoops as you will with regular lender.

Mine always has investor friendly/hungry contractors that show up regularly.