Calcium chloride is also added to concrete to accelerate the exothermic reaction in cold weather.
White tiled room at bottom of steps looks like it was/is a pool now filled with dirt. Stainless hand rails add to that feel.
All the pics/vids I've seen of that place tonaight indicate a bunch fucking savages have been inhabiting that place. Dumbfucks even appear to be undermining the foundation and knocking bricks out from under load bearing walls.