Rich Dad, Poor Dad; @Brandon Turner's books; @David Greene's books.

It will depend on your zoning, but they normally require a separate power meter for the ADU to be capable to renting long term to a traditional tenant. 

Monthly 1 year rental history is $4,200 per month with leases in place at this same rate carrying through next May.Looking to completer the BRRRR and do a cashout refi and the bank who I have the $271k loan with said they could not do a cash out refi2 j as I don't have a traditional W2 job currently and my 2020 taxes show my investment properties as operating as losses (I have 4).  

#3 You’re Looking for a Long-Term InvestmentMaybe you’ve done your research and know not to look for some get-rich-quick scheme, but rather, are interested in a steady long-term approach to wealth.

As @Scott Runyan mentioned, the size of this deal seems better suited for a JV or partnership than a traditional syndication. 

It's not Tom Vu Get Rich Quick babes on a yacht overnight. 

The alternative are the heavy fee HOA townhomes for the rich kids, but you still end up doing all the landscaping like an apartment complex. 

Would that work best in a conventional or traditional loan?

Don’t rule out anything until you take a step back and look for a potentially alternative idea to a traditional method.

I did not follow through with traditional financing because 75% of income is derived from a monthly military benefit and my business partner is a travel nurse/ contract worker so her W-2's don't reflect her true income.