I think most everything has been covered. Housing will be different for every campus. Way back in the late '60's or early 70's, my campus did away with Greek houses. Instead, they moved them all into a dorm, and each GLO was given a hall to live on. (I guess communal living was really big at the time).
All of the fraternities and 1 sorority are in one dorm. The other 2 sororities and my GLO are in another.
You don't
have to belong to any GLOs to live on these halls (I lived on another sororities hall the year I pledged!), but the GLOs get first dibs on all of the rooms (and have to fill X number of rooms to keep the hall).
Also, each GLO has a chapter room (or "frat room") in the basement of the dorm on which their hall is located. (There is one GLO, APO, which doesn't have a hall, but
does have a frat room.. in fact their's is the largest!

).
The rooms were used for rush and pledging/new member events, parties (sometimes.. some of them are
tiny), chapter meetings, etc. The school was also very good about letting GLOs hold events, especially for Rush, in other places (like the Student Union).
Also, many brothers or sisters would live together in apartments as previous people mentioned.
I would have loved a house, too! But one of the advantages of having the halls was that we got to meet a lot of new residents (and potential members!) Our hall was "self-governing" (basically this meant men could be on the hall 24 hours.. it was a women's hall.. much to the disappointment of our male members!) So we got a lot of transfer students in the arts (I think the administration intentionally put some of those girls there!) and occassionally freshman or member's roommates. (My roommate never joined

, although she almost did. But often a member would have a roommate who ended up joining before the year was over).
Ok- that was
way more than I meant to post!
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SilverTurtle@greekchat.com
Phi Beta Fraternity
Phi chapter