There are certainly ways to do that, but they increase risk as well as potential reward. 

It's far harder to qualify for conventional loans if you're a business owner or self-employed and that equals opportunity.When I look at doing a potential owner finance deal the most important thing for me is skin in the game. 

Any property operating under current laws would be allowed to continue as a legal non-conforming use as long as owners continued to renew their license.

I'm excited about the prospect of networking with you and exploring potential collaborations! 

How do you find someone to show the unit to potential renters? 

For the proper set up of the PM biz and QBI and any other tax/legal questions you'll want to consult a CPA. 

How can I find a list of homes that are not currently for sale but that may have an ADU, so that I can start to reach out to these owners about any potential interest in selling?

@Tracy Scott it's highly dependent on the deal, the type of property and the location.In addition to the items others have mentioned, here are some of the biggest potential start-up expenses that I study closely before buying a property:Foundation/structure--this is one of my few "deal breakers", I typically will not purchase a property with significant foundation or structural issues.

These small touches create a positive first impression for potential tenants.

Sure they eventually get evicted, but if they owe 2 months' rent + legal fees + set-out fees + damages, etc. that measly $2K that was collected as a security deposit doesn't cover the total loss.For the same amount of 1X-2X cash deposit, we can get a Rhino policy for 3-4X the coverage.