As soon as you start discussing your business practice and strategies with your customers (tenants), then all bets are off and you run the risk of Fair Housing violations. 

They offer flexibility in design and can be customized to include a business space.Shipping container homes: While trendy, these can be challenging for mixed-use (residential/commercial) purposes due to zoning and building code issues in many areas.

I'm looking for ways I can "protect" this private lender. 

While the landlord defined the dwelling unit as his single-family home; the court, after analyzing the statutory definitions of the term, the determined that the dwelling unit at issue was the separate room being rented to the tenant.[2] As a result, the landlord had converted his single unit dwelling into a multi-unit dwelling that was subject to Oakland’s Rent Adjustment Program since the individual rooms were not alienable separate from the title to any other dwelling unit.Under the court’s decision, tenants in Oakland renting rooms in a single-family home or a condominium are entitled to the protections provided by Oakland’s Rent Adjustment Program.

If its a very large property, you may also want to make sure you are marketing to any wedding, family reunion, corporate meeting/team building customers. 

This protects you in case the buyer defaults.Lastly, keep in mind that owner financing comes with some risk.

The software allows me to generate custom reports on my rental income, expenses, and overall performance.

For people reading this - I don’t know the sponsor and this is a general comment but if a sponsor had issues reporting to their customers that should be a giant red flag.

Excellent customized spread sheet. 

Tenants wont be hard to find like you mentioned but mindfulness on the protection laws in the process will be important.