There are only three 3 bed, 2 baths available in the entire zip code, and I listed mine to match up with the highest priced competition.

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

State Code 5321.04 Landlord Obligations Section 4 "Maintain in good and safe working order and condition all electrical, plumbing, sanitary, heating, ventilating, and air conditioning fixtures and appliances, and elevators, supplied or required to be supplied by the landlord"

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.