Here is an old post from the archieve regarding some of the equipment that was removed.
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There wasn't a single window left on the structure and I don't recall a door either. The rafters appeared to be the favorite resting place for birds in the area. And there is the large hole in the roof where a vent pipe once was. The only items left on the inside are visible in the pictures that I posted. The one photo I didn't post was a shut of a shutoff valve beneath the floor. It is surrounded by a metal ring that probably had a cover at one time like a manhole.