Slightly off topic- on top of Brandens tip of telling tenants your the building manager, get a phone number with a different area code.

Used to be an engineer, but zero chops on writing code. 

The city checks the house every year and it is in compliance with city code. 

For you be successful in the future you need a basic understanding of the tax code.

That is why I have all my places with a sub-meter for each unit and to get away from this issueNot sure what state you are in but in California - you can not prohibit electric vehicle charging See Calif Civil Code 1947.6.

Can you list areas or even maybe some zip codes?

The 1962 edition of electrical code made grounded outlets mandatory.

It will be considered a 3/2 since the additional rooms were added illegally.You need to get those 2 bedrooms permitted and up to code for them to be accounted for.

Other items being odor removal, illegal tapping into power, and out if code re-routing of plumbing.

There are a few tax codes to pay attention to though and my wife and I had to weigh how to classify our personal home.