The ADU will generate the best cash flow in the long run but will take time and more money than you are estimating. 

We have a single door rental worth about $320,00 that will be paid off on June 1, a half duplex that is worth 260,00 with a $120,000 mortgage and our primary residence is worth $650,00 and has no mortgage.

Are you struggling with how to run the numbers on a property?

Let me know if you want me to run the numbers through my software for you. 

Going forward, my plan is to add 3 doors per year for 10 years.

You'll find that most of them are happy to run comps for you and help you learn how to do that on your own as you go. 

Congrats and 2 doors instead of 1.Great Job.please reach out about anything related to tenant issues or maintenance  issues. 

Run the numbers in the UW to see how big of a gap you have for new construction of those units 4.

Yes, you have to hang your license with an institution because it pragmatically isn't economical to run your own independent shop these days.You're still often brokering or correspondent lending, though, if you work for a mortgage bank or mortgage company (eg, not a "bank" bank, where you can have a checking account).

I’ve been through markets I was sure had “bottomed” decline another 40%; markets that couldn’t possibly go up anymore quadruple; I’ve purchased properties at foreclosure auctions I thought were home runs I couldn’t sell OR lease for three years forward, etc., etc.