How to see if the corridor is monitored?

In this case, whether there is a camera can be determined by observation and inquiry.

Corridor monitoring is usually installed at the entrance and exit of the corridor, elevator entrance and other positions to monitor the flow of people and safety in the corridor.

If you want to check whether the corridor is monitored, you can observe whether there are cameras at the entrance and exit of the corridor and the elevator. If there is a camera, the corridor is monitored. Find the property or owners' committee to find out whether the corridor is monitored.