This illegal tenant has done something very serious that will likely require the master tenant to go to the police and report it.

But that was just a thought she might be a little to gun ho and try to turn me into the sign police.

I think I'd like to look into when the carpet needs replacing to remove all the carpet and pad and tack strips and stain and polish the concrete floor, now that would be pretty indistructable.I've seen stained, polished concrete floors in high end units, one was $1M+ and they looked great.

The polishing is the trickier part, especially if you want a bull-nose etc type of finish. 

I advised the tenant to call the police if she fears that her vehicle may be damaged by the actions of the teenagers in the lot.  

They will pay a premium to be within an easy commute of their job in an apartment run by a landlord they feel they can trust and who's prompt and professional on maintenance, even in a poor neighborhood.A top reason a pocket neighborhood forms is a police station.

My husband called the police immediately, who came to the scene and then notified his family, and his family came to the house.

They did it to one of my neighbors, and the tenant came home, the place had notices on the door and yellow police tape all over.I'm told years ago when you play around with a professional tenant, you lose.

Is an exception to that rule for service members and police officers a good idea?

He is now in a local hotel, and police consider him to be 'homeless'.