When I arrived, the security company was on the scene (car, but no guard) and then Dennis pulled up. He'd been called, too, but thankfully was awake and able to call the cops off. We went in and discovered that it was the rear door to the parking lot. The gate was locked, so it was a mystery what set it off.
We checked everything out and I reset the alarm. We were just making one last swept of the lobby and TBG froze and pointed to the far end of the lobby. "I just heard something down there."
We checked and there was nothing there and I made a joke about the ghost messing with him. Then, and I swear on my grave this is true, one of the battery operated candles on the table beside him lit up. And then the alarm went off again. TBG turned off the candle and we went to check the alarm. Again, it was the back door to the parking lot.
By this point, the security guards had made an appearance and confirmed that the second one was them checking the building. Still no idea what triggered the first one, although Brian is getting more and more angry with us (over a variety of things). If he got drunk and decided to take what was his (and isn't), he might have tried to come through that door and got scared off. He wouldn't have been able to get pass the alarm because his code was taken out and everyone else changed.
It took a while to get back to sleep...