The SW corner of the GCP. That's an 8 inch ceiling vent. The two holes in the top of the wall are where the hot water pipes came through from the heater room. The ceiling is bare concrete with 1X4s attached to it. Someone who was inside the building in 1960 says that it was abandoned and empty then, but he recalls Insulrock on this side too. If it was there, it has been completely removed.

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