No Kelly, I'm not going to flame you. If he was overmodulating and creating a big mess, I can't blame you for doing your job. And the guy WAS not licensed. If you're running at more than 100 milliwatts with antenna of more than three meters, you are legally a pirate and that won't change until the law does.
Also, from a property management POV, if he's creating that kind of mess with bad equipment, he's probably causing RF interference elsewhere with other people in the building. Secondly, in most apartment buidings, tenants aren't allowed on the roof (liability issues.) If he somehow got up there and made alterations to the property (putting up an antenna mast, etc.) without written consent from the owners and management, he's violated his lease - BIG TIME and can be evicted. Besides, it says in most leases that apartment units are to be used for no other purpose than residency. Whether they are zoned commercially or not. Aside from a legally operating Part 15 hobbyist, you can't run a radio station from an apartment building.
You should contact the manager of the building and explain your problem. That brings it home in a BIG way without dragging in the FCC. Chances are, other tenants have been having unexplained interference problems and this can clue him/her into who is causing it.
Cheers!