Arrived at the front door to find it roped off - at least the part where one of the double doors had shattered into sparkling crumbs. Sat inside and looked through the inner doors to draw the fractured column left standing, then asked a guard, "Was it bumped? Was it vibration from the work on the pavement? What happened?" He said that it was not bumped, and that they thought it was either vibration or the sudden temperature shift in the last two days.