I believe the warehouses in the back (and the other bits way in the back) are all part of General Chemical.

yeah, we saw the sign next to a super duper secret facility looking secure gate, lol. I've thought about contacting them giving some mumbo jumbo to try and get into the buildings.

last time I was there, there was a hobo sleeping on the front porch. There was also someone driving around in a jeep (just playing around) behind the building and fence. The place is or I guess was the office for the chemical place I think. It's been a while since I went there. Whatever is underneath the building where the the garage doors are has to be cool.