When do buildings close every day (i.e. Bartlett, etc)? Or do they ever?

Buildings on campus are locked at night. However there is probably not a set time for each building as each building is locked by a different person. No particular department or person is responsible for locking all of the buildings. During breaks and weekends the buildings may be locked earlier than during a weeknight during a semester. If someone needs to know they should call the office or person from the building they need, that person may know when the building gets locked each night.