Our chapter room is the largest on campus, but none of the sororitie have houses yet. The chapter rooms are on the first floor of the two high-rise dormatories on campus. I can't speak for the other sororities, but we're generally not allowed to have non-members in there: especially not during meetings, rituals, sisterhood events.
We do hold recruitment in our chapter rooms, but it's getting to the point where we have SO many girls rushing that everyone is smooshed into the rooms. Since we have recruitment in late August to early September (and this is Tennessee), the rooms get VERY hot with all the bodies in there, and luckilly for us, we're the only ones who have air conditioning.
Many of us go in the chapter room at random times to study, watch TV, or just talk. It's a rather "unwritten rule" that we normally shouldn't have non-sisters in there, but occasionally a sister will bring in her friend or boyfriend for a minute or so when we're not doing anything that shouldn't be known about by outsiders. There is always the large dorm lobbies where we can have friends/boyfriends stay and wait for us while we are in the chapter room.
Our chapter room was just re-decorated, and it has always been a formal room, although we do have informal events in there (we just move the furniture). We have an attached bathroom with two sinks, a small kitchen, and a big locked closet for ritual items.
We have two couches, an extra-large wooden table with approx. 8-10 matching chairs, two high-backed living room chairs, an entertainment center, several display cases, shelves, and end tables. We also have TONS of trophies and plaques displayed all over the room (hehehe). Framed chapter pictures line one wall, and I could just go on forever about the other decor, but I'll spare you.