I suspect that he intentionally got the Zoning certificate for floors 1, 2, and 3 because he probably didn't get permits and didn't want an inspection of the garden unit.

When tourism picks back up get an accessory permit and STR the other side.

@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.

Look at zoning either online or at the City or County courthouselook up both the Zoning Map and get a copy, if one exists of a Zoningtemplate, which explains what each zone permits and may allow under aSpecial use or Condition permit.B.

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?

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

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

If you are doing specific types of transactions (flips, BRRRs, etc) in a specific market, you could also find the person doing similar deals to yours (leverage tax deeds, property records, permits etc.) and ask them.

So Permits?

Builders tend to follow population growth and in my city most of the building permits are headed towards the suburbs.