If you are the last person to leave the building or one of the last people to leave … Please make sure all of the lights in the building are off, all interior doors are closed (per the fire marshal), and all exterior doors are locked and latched. When you leave you always need to check that the doors are latched and locked by gently pulling on the handles.
We would also encourage you to lock yourselves in the building if you are by yourself or only a few people are inside as there have been several times recently when the doors have been left open and people have wandered into the building.