Will there be more issues come about at an inspection?

See the old mom-and-pop investors in their sixties that you are trying to buy off-market properties from.This is like people who buy for cash flow but don't realize that with the best cash flow comes capital expenditures and tenant issues.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

Had structural issues (wall caving in) that I addressed a couple years ago.

Quote from @Gregory Carter: I have this same issue.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

The reality is there are many issues with ADUs as an investments and the poor valuation is just one of them.  

Maybe it has more to do with the software than the company (although their customer service sucks), in which case you might run into the same issues with other emulators, but it has just been constant headaches.

The issue I have seen with these types of properties is they could have two valuations - the value of the real estate which the structures will have little value and you have the land the other is as an operating business just like a bed and breakfast would have - real estate has value but it operates a business now you mention 12k / month but if someone also has to manage the property what is that worth and what would someone pay to manage a property like this?

Here's info on screening tenants here from BP - and a link to a screening partner.BP's Tenant Screening - Ultimate GuideGood luck.