Security systems an important feature of residential buildings.

Twelve years ago when I was living on the Upper West Side, a neighbor was notified over his scratchy intercom system that a UPS carrier had a package for him. Without hesitation, he buzzed in the deliveryman and opened his front door. But instead of receiving a new package, the neighbor was met by an intruder pointing a gun. Tragically, he was shot and killed.

This story represents an extreme case of what can happen when buildings rely on unsophisticated audio-security systems to protect their residents. It was also a personal wakeup call. The tragedy that befell my neighbor could have happened to anyone. It could have happened to me, or one of my loved ones. The reality was shocking.

Unfortunately, the same reality still exists today. Buildings without strong security systems expose their residents to potential risk.

Keeping this in mind, building owners must refocus attention on security and assess their current system. They need to ask: Is an audio security system sufficient? Are all entrances to the property secure? Do residents have a way to contact authorities if an intruder is already at their door? Is it easy for the concierge to contact residents directly and vice versa? Are the systems in place meeting the needs of all residents?

If the answer to any of these questions is "no," it is time to take proactive steps towards purchasing a new system or upgrading the old one.

There are several points an owner -- or new developer -- should consider:

* Features of the system -- Security systems, like people, come in all shapes and sizes. Purchasers should make sure that the product they select has a video intercom system. This immediately will enable the resident to view the visitor from a screen (not unlike a small TV screen) in his/her apartment. A high quality audio announcement should complement the video component. Other security features to consider include home intrusion alarms, smoke and medical alerts, and onscreen messaging.

Convenience of system -- Many concierges announce visitors via telephone. However, this isn't effective if the line is busy or the phone lines are down. Selecting a security system that does not connect to the tenant's phone is a better, more secure option.

* Privacy Issues -- Some buildings have video cameras that transfer real time images to tenant's televisions. Not only is this inconvenient, but it is also unsafe. Tenants who can view entrances via their TV screens can record -- literally -- who comes into their buildings and when. On the surface this sounds fine... neighbors can spot intruders. In actuality, residents themselves can track the daily routines of their neighbors, a clear invasion of privacy.

* Installation and Maintenance -- Some security companies will install a system, but then disappear at the first sign of a problem. Owners should make sure that the company that sells them the system would still be available whenever there are maintenance questions or issues.

* Ability to upgrade -- Many security companies promote basic systems that cannot be upgraded or altered. Although these systems may be less costly up front, they could pose costly problems down the road, particularly if the entire system needs to be replaced. Also, upgrading the system should not pose lengthy or challenging installation problems.

* Cost -- Security systems need not be overly expensive to be effective. Potential purchasers should examine different systems and their features to see what works best for their building and what they can afford.

Many owners and new developers take a great deal of time determining what amenities to have in their buildings. Should they install granite countertops in the kitchens or marble in the bathroom?

Are hardwood floors preferable to carpeting? Is there going to be a fitness room or play area for children? But in addition to these considerations, they should also consider what type of security system to have in place.