Some of you may have address lights that are out. In almost all cases the outage is a result of the transformer having been disconnected or removed. If you have had remodeling done in your unit (And especially if your doorbell no longer works) then this could be the culprit. The transformer could be in your closet or it could be on the wall where your doorbell is (was).
The First Responders like to have illuminated address numbers for nighttime address location.