However neither person is local , they both have filled out applications and seem to check out , but both have "Not for Real ID" IDs which seems like a red flag to me. 

Lenders have different loan capacity at any point in time; they might not announce that they aren’t making a certain type of loan right when you need it; they’ll take your application but either delay you to death or find an obscure reason to decline the loan4.

So for $400 they can buy 1% and depending on the rental rate of those homes, they receive the applicable % of the monthly cashflow as passive income.

I do like the application but obviously the customer support is lacking. 

I suspect this would happen if various parties were given the ability to ask questions in nearly every application for what this thread touches on - and I have major concerns about integrity (and credibility) issues involved in putting yourself in a position to defend this position if ever challenged. 

Anything from public datasets to premium tools or software would be helpful!

TAYour ADU application will likely need to be signed by the tenants occupying the property so having a conversation with them is important.

Tenant shall be responsible for any property damage caused by failing to maintain utilities or report utility problems in a timely manner.Tenant Utilities: ______________________________________________________________Pass-through Utilities: _________________________________________________________Utilities included with rent: ____________________________________________________Propane: If applicable, Tenant shall return the propane tank level to at least _______% upon termination.

You'll need good contact info for them to be able to collect, and ideally the new address for the tenant however which if you don't have can probably be found easily with some online sleuthing/ contacting their employer, skip tracing software, etc. 

What software did you use to manage the renovation?