[jelavich]

Servers run until vendor contracts get terminated.

But actual lights? In shared office bldgs it actually depends on the renter's requests to the cleaning service. I've worked many places where the crew would turn the light on/off when entering/leaving (though would be shocked seeing me working in the dark); but I've worked a place or two where they requested all lights stay on all night, because "when mgmt shows up early in the morning they can't find the light switches next to the door" (made up quote but you get it)