@Eamonn McElroyIf he has a truly self-directed Solo 401k plan then the bank or the brokerage does not dictate investment choices, this plan allows you to invest into virtually anything and which is permitted in the plan documents.

Advertise to recruit a lot of prospective tenants and then narrow down the ideal candidate through the vetting process.

Make sure you do proper credit checks with your prospective tenants and always treat them as tenants.

The prospective tenants can submit the application and pay for the screening directly through Cozy.

Info:  Storage FinancingSTORAGEFINANCING FOR PROSPECTIVE AND CURRENT OWNERSJustfinishing our financing on our latest location.

These include rent control, security deposit regulations, lease violations, late fees, eviction processes, barriers to entry (permits, licensing, etc.), and so on.What are your thoughts?

You dramatically reduce your prospective buyers by doing so.

I know permitted ADU can get its own address but how does non permitted unit get a separate address? 

Many PMs will put lockboxes because this way they can give codes to prospects or buyers agent representing a tenant might just give and get paid a commission without doing much work.

The seller has to work on something at the house that had an open permit because not up to code.