Since there's no doorman or security staff,
it is up to each and every one of us to practice security awareness for our mutual protection and security. You're entitled to install your own lock on your door,
so long as you grant access to the landlord for maintenance (such as the yearly air conditioner/heater vent cleaning).

Maffey's Lock is highly recommended
because they are security experts in this neighborhood for a long time and are familiar with this building.
Just tell them you are in the Chilton Towers and they'll know what's right for your door.
The best mechanism is a "vertical deadbolt", also called a Segal Door Lock.
Maffey's Lock & Safe Co
1172 East Grand Street
Elizabeth NJ 07201-2324