After a key switch is installed, what is the property owner's responsibility?

When a key switch is installed, the property owner's responsibility primarily includes contacting the Fire Marshal's office. This step is crucial because the Fire Marshal needs to be aware of the key switch for safety and emergency response purposes. The Fire Marshal’s office may need to update records or ensure that necessary protocols are in place for fire safety inspections and response procedures.

Keeping the Fire Marshal informed helps ensure that emergency services can access the property quickly and efficiently during an emergency. This communication can prevent delays during critical situations where immediate access is vital for saving lives and protecting property.

The other options do not incorporate the necessary steps required for compliance with fire safety regulations and local laws regarding fire safety measures. For instance, notifying insurance, while important, is secondary compared to the immediate need for emergency services to have access. Similarly, while posting a notice or removing old locks might be helpful in some contexts, they do not fulfill the fundamental requirement of ensuring that the Fire Marshal is informed about the key switch installation.