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

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. 

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. 

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

@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.

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

Do you feel this is controllable or that it's mostly up to chance who succeeds and who fails? 

So then Nick ask everyone who is interested to learn everything there is to real estates (he explained earlier - to secure your future you got to have knowledge which then you gain control and thus less risk - i thought that made sense) to now stand up and go to the back and sign up as seats are already filled.