I assume you're talking about the apartment listing on the C/O 2018 facebook group, haha.
This seems to have been popular with the D3 and D4 classes. I'm guessing maybe one person built one and others followed suit, and now they're left behind at the apartments they lived in.
Most of the "labs" in these houses contain high speed, slow speed, and air syringe for you to practice preps/restorations and stuff like that at home. Some people used them for some patient lab work during their clinic years as well.
In my opinion they're not really that necessary. There's only so much you can do in a basement. I prefer the full blown lab at school. Also, I waxed at home once during my first semester and hated it (they give you a crappy take-home torch, and the lighting at home doesn't compare to the lab). The lab stations at school are so much better.