We haven't had anyone look at the ADU to see if it meets the codes, but there doesn't look to be any glaring issues with the unit's construction. 

I have been told that it can not be rented out but I did read in the code for the zoning  specifically for accessory dwelling units that I could have an employee, caretaker for watchmen live there.

Both are a violation of the city codes/laws so I feel there's not much I can do to stop the tenant from calling and complaining.Starting over from scratch seems like a great idea lol looking into it...

These are professionals with additional training and a stricter code of ethics.

No reason to fight a battle with them twice of raising the rent, dealing with things like junk cars and occupancy code violations and then if you are successful in these areas turn right around and ask them to move?

They have to because the permit fees are used to pay for the code enforcement department and every municipality wants to collect enough to cover that department (and more!)

Please quote me the property code that says you must have an AC. 

Just as anyone can learn to code (as I did in high school in the 1960s writing Fortran II programs on punch cards for an IBM model 1401 computer), anyone can learn how to buy the house next door and fill it with tenants who pay for it for you with their rent payments over the next 30 years.

One where unique codes can be created for specific vendors and ideally, created and deleted remotely?

I’m only interested in multifamily in certain zip codes.