This is my last desperate plea. Do not destroy this icon for trivial reasons. However much the storm runoff from the hangar might be toxic, it in no way presents a hazard either to people or even to the biosphere. The runoff all collects in a basin and is then discharged into the bay, with NO DISCERNIBLE HARM!
If the runoff were harmful, the cost of continuing chemical passivisation would be a small price to pay to keep the structure. There is NO WAY else that this building can harm anyone, and this mindless obeisance to an over-broad regulation, a kind of zero tolerance gone mad, boggles the mind.
I beg of you, re-institute a hearing on retention of the hangar in its present condition.