In college, I lived in a co-op – on-campus, owned by the university and so-called because rather than rely on the custodial service that cleaned the other campus buildings, we divvied cleaning tasks among ourselves. It was cheaper to live there than in the dorms or off-campus. There were several on our campus, and I lived in no fewer than three. There were not the hippie havens they sound like, though the one I lived in for two years in a row had a hackey sack circle going out front pretty much 24/7. That house – the only coed house in Oregon State's co-op system – was far more like a coed fraternity.
None of us would have admitted that at the time, of course. All of considered ourselves a little too cool, a little too lefty and a little too mellow to participate in the, pshhhh, Greek system.