I found this poster rolled up and damp in wreckage of our apartment, and it wasn't in too bad a shape so I let it dry out and scanned it as best I could. (It's bigger than my scanner, so this isn't quite the whole thing.) This is the place I lived in grad school. I know some of you know what a "cooperative" means in this context, but in case you don't: it really is pretty much self-governed, mostly by committee, in the case of a big place like this one. There are elected committee chairs and director and treasurer and so forth. Each resident has at least one assigned job, like sweeping the hall or helping cook dinner or taking minutes at board meetings. I think everybody was supposed to do four hours of work a week. I loved living there and got really into all the governance stuff - I was on the board of directors and later was treasurer, and finally ran for director (somewhat against my better judgment) and ended up losing by one vote, which was probably for the best.
The Ark is still around, but nowadays it's called Pearl Street Co-op. (Scroll down and there's a lot of pictures. It looks like the common areas have been remodeled, but the rooms look about the same.) I heard, a couple of years after I had left, that things got really chaotic there and that it finally got so bad that they shut the place down for a semester. So it's not really surprising that when they re-opened it, they gave it a new name. I think "The Ark" went perfectly with its old hippy-dippy reputation - which believe me was well-deserved.
Oh, and before this place was the Ark, it was a girls' dormitory which catered to sorority-girl types. Farrah Fawcett is supposed to have lived there in the late 60s.
(I don't know if you guys have been enjoying these nostalgia-themed entries, but I've been enjoying writing them. As long as I keep scanning pictures and so forth, especially, you will probably keep seeing them!)