Apartment security system service light is on
I'm guessing there's a worn out battery in the panel or one of the sensors and that's causing it to act up.

You have a couple of options:


Call a local home security company and have them either fix the unit, replace it, or deactivate it.  They might do it for free if you sign a service contract.
Deactivate the panel yourself.  Remove the panel from the wall, disconnect the power cord (and a phone cord if there is one), then open the panel and disconnect the internal battery.  (To disconnect the power cord, you might have to open up the panel or unplug a mysterious looking plug from a nearby outlet.)