Anyone who shall have or maintain on any commercial premises an audible-type property, burglary or robbery alarm shall maintain posted at the main entrance to such premises a prominent notice of the telephone numbers at which the person or persons authorized to enter such premises and turn off such alarm can be reached at all times. This requirement is satisfied if the number provided is that of an alarm monitoring service that has a current contract for monitoring the premises, and the alarm system user has provided that service with current contact information. (Ord. 2144 § 2, 1997)