They are packing up and employees are heading back in. I think they may have made a hole in the roof.. Saw a bunch go up the ladder on the roof then saw a bunch come out the front door 30 minutes later.
What ever it was wasn't too bad. I guess that's why they had 7 trucks there, to make sure it didn't get bad. Someone (not FD) up on the roof going over one of the AC units right now.
That's fog, not smoke in the background of the picture.