The ADU (with a separate address) adds about 700sqft (2BR/2BA) to the existing 1100sqft (3BR/2BA) main home, with the additional sqft and bed/bath count showing up on the property's title report.

Without the existing relationship, I’m wondering if they would be willing to help when you simply cold call new companies.

Are there other options that may exist?

Your Cap Table of investors Stock shares Authorized and issued will be presented for investors to calculate the Valuation if you are not an existing company with at least 1 year of Income history investors prefer CF filings and smaller valuations. but until a minimum of 100 investors and 1 year of audited financials, you can not become a REIT

If anyone knows of a group or forum that already exists with this purpose please let me know!

To the titular question: Yes, tons of LLC's and businesses exist that flip houses. 

Looking at a duplex for 65k only is tied to the owners house, which has an existing mortgage, however the house isn't part of the deal.

And consider putting a percentage into cryptos - sure, many coins may crash and many approaches are not time-tested, but also, there has never been such opportunities for life-changing gains as now exist in that space.Our wealth is spread between real estate, cash, stocks/funds, crypto, and a little in physical metals.

If it is in a ADU zone and there is a non-conforming existing unit it is my understanding that you can do the 4 unit loan limit pending the certification of the 4th unit.  

However, it has the potential to turbocharge an existing company.