Had he done it on his own without your permission then he would be off the hook.

Doesn't mean you won't get a brick thrown through your window in the middle of the night but it's permissible in most cases.

So did you give written permission for current tenant to extend stay.. has she paid any rent for same period..

I've also heard I should go to the court and ask for permission to remove and store her items. 

In the mean-time, get on the phone with attorneys who represent LANDLORDS and get appointments set for Monday morning to protect your rights.In the future, don't ask permission to enter.

That said, if I ever were to allow pets again, I would be sure to have very strict provisions in the lease to protect myself if the pet causes damage or injury, and to allow me to revoke permission to have the pet.

Bottom line: landlord tells tenant that if she wants her heating unit fixed, she has to sign up for an actual gas account because if not, the gas company has every right to cut her off for having used it without permission.

Did you give permission to her to install the tile?  

That means ask permission before you enter the yard too, especially fenced areas.

But on the flip side, someone that keeps an immaculately clean home, that makes improvements with permission without looking for an exchange of discounted rent, who pays ahead...