No, you'll just avoid some areas, like you would in Mexico.Clearly, if the violence would get out of control and too many accidents with tourists happen, the growth in tourism could in theory slow down but it is nobody's interest that happens, including the drug cartels.

Though fee schedules vary by company, generally speaking, you'll pay more up front for checkbook control and less over time, since the full custodial companies will have transaction fees not to mention the red tape of going through the custodian for all transactions. 

He may get stuck with rent control laws that prevent him from catching up later. 

I'm sure you and I both understand that as flippers, having control over the construction cannot be stressed enough.

If you’re still concerned, you could consider installing programmable thermostats or low-flow fixtures to help control costs without relying entirely on tenant behavior. 

@Dylan Jeluso, where are you feeling you don't have control?  

Also make sure you understand everything about adding an ADU including value of the ADYPU, financing, impact from rent control, duration between initial expense and initial income, true cash flow (know the 50% rule, at 50% rent ratio initial property tax will be near 20% of income)- educate.  

This implies residential units can be built at lower costs than ADU additions and provide better return. 11) adding an ADU to SFH can make the SFH fall under rent control.

It's almost as if someone gets Google alerts when his name is mentioned, and then "deploys the troops" when damage control is needed.

Where are the HVAC controls and do both units have the ability to access it?