Certain unnamed consulting company had a laboratory that was converted from normal office space in a rental office building. All the corrosive fumes from their processing area were ventilated to general ventilation. In the ground floor. Even their own office ventilation ducts were dripping acid and they had a piece of roof drainage suspended with wires to catch it. Fire exits were blocked by hydrogen tanks. Ground floor, so on need for fire exits. People can just brake a window.

People are destructive idiots that seldom get caught.