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.

Your strategy takes advantage of your employment cash flow and ability to control discretionary spending.  

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

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

Do you have control on the management group/rent price? 

I'm mostly a silent investor on that one, so I don't have much control over it.

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. 

Condo's are ill advised for investments because you possess far less control.

Every property we onboard the owner has complete control over their furnishing budget; we have never and will never dictate this.

If you're happy with getting a note on ANY house in FL you might have more luck, but then you don't have as much control over the condition of the property or its location if those are important factors to you.