If you live in an apartment or condominium, follow the same rules about cars, keys and locks, but add these to your checklist:

• Keep outer main doors locked. do not press the buzzer to release the door unless you are certain who is requesting entrance.
  
  
• Look through the peephole before opening the door.
  
  
• Cooperate with other tenants in notifying building superintendent of suspicious looking strangers, sounds or actions in hallways.
  
  
• Place supplemental locks on windows or doors that open onto fire escapes, terraces and balconies.