Multiply that by the complexity of each investor's individual circumstance and you get an infinite number of optimal strategies. 

No matter where you live or where you own assets, I personally recommend the Series LLC to be a great tool for the individual investor who is planning to expand their operation, as it allows for you to scale infinitely for FREE.

If you plan on growing, the Series LLC is a fantastic tool for you because it can scale infinitely and still house each property under separate "child" series.

If you can reduce the Heloc payment with own capital etc you increase your cash flow even more, but remember if you are using 100% Heloc you are basically buying this house with none of your own money, so your ROI is infinite.  

This allows for infinite scaling as you grow to compartmentalize the liability from properties, but the “child” series LLC are private documents and can be established from your computer - it’s a fantastic tool.

One caveat to that is a highly skilled RE investor will use leverage to the infinite degree but you have to be really smart and understand that when the market changes things could get hairy.

That means a target of “Infinite “ CoCROI. 12% means you left a significant amount of cash in the deal.We want all of our cash back so we can invest it in the next property.The reality is we end up leaving some cash in some of the deals for one reason or another.  

ROI is infinite because you plan to pull all of the money out after year one. 

I am an admin on the REI Blackbook, and love all its infinite capabilities.

In all 3 scenarios, your ROI is almost infinite because you don't have any of your cash invested in the rental property AND you have between 20 and 25% equity in the property in case something happens to you financially later and you need to sell.