I traced it using the name on the side. BAC.
It was installed several years ago when the restaurant in the basement was illegally built. This thing has created structural problems for the building.
On one of the common area floors, it buckled so much the tiles popped out. These tiles were covered over and fixed one week ago.
Everyone can feel the building shake and vibrate when it is on. SOMEONE has a video of his kitchen shaking. I was researching it because I thought it was AND IS a fire hazard -- no one has full range of the roof top. This thing is in the way. And, then, I discovered what it was and what it weighs (tons):