Final answer:
The alarm system is typically responsible for notifying law enforcement in case of a break-in at a real estate office, as it can automatically alert police or security services.
Step-by-step explanation:
The entity responsible for notifying law enforcement in the event of a break-in at a real estate office would generally be the alarm system. Modern alarm systems are often equipped with features that automatically alert local police or a security service when they are triggered by unauthorized entry or disturbances within the protected area. While security cameras can record the incident, and audio recorders can capture sounds, these systems typically do not have the functionality to directly notify law enforcement. Instead, they are more often used for surveillance and evidence collection after an incident has occurred.