@Chan K.landlords in Massachusetts are not required to provide off-street parking nor are you required to police the parking area you do provide.

Hey DanielThis type of behavior is best left to the police to handle.

they raised ours to $85.00 /Yr to pay for extra police presence. 

It is too hard to police everyday and not a workable system (you'd be stressed and in conflict and maybe violating their privacy if peeking in or around the place too much).

.)- Lawyer specializing in landlord tenant law (again you can use your landlord association and get familiar with local laws for bad debt collection, evictions etc)- Police department, do they have community outreach programs that you can join to decrease chances of crime (Cameras and lights are great, but prevention is best!)

While I am not the Topic Police, don't you think you have all been played against each other long enough? 

Only reason I would hesitate to call the cops is because you don't want the neighbors to start associating you property with the police showing up unless you really have to have them there.

As a retired police Commander (30 yrs), I went to Afghanistan embedded with Infantry Brigade Combat Teams (2011 with 45th IBCT, and 2013-2014 with 2nd BCT/101st Airborne) as a consultant on a Dept of Defense contract.

A real estate agent was showing a married couple a home for-sale just outside of Fort Lauderdale, when a gunman barged in and shot and killed the husband before fleeing, police report."

The only problem with that is like it is a nail polish, when it starts to peel off, it will start to look ugly, just a thought.