Tenant Changed the locks

[Kyron Ryals]

Hey BP 

My family owns a few properties in North Jersey (Newark to be exact). I'm writing about a condo we have. Our tenant recently changed the locks without giving us any type of notice, or providing a key, and got hostile when we requested one. So my question is far as the state of NJ is concerned are we supposed to have keys? Can we change the locks and provide the tenant a key? Should/Can we take the tenant to so the judge can tell them if what they did was illegal? I am just a little baffled by this whole thing. Please help