The dynamics of this play out different on various campuses but at my alma mater we had a bunch of "right off campus" apartments that competed heavily with the dorms. Well, it wasn't much of a competition, if you calculated your monthly rent based on what you paid for room and board, you got about $700/mo to live in a dorm with 3 others.
By comparison you could go off campus and rent an entire 1bd for like $750/mo. A similar living situation off campus with 3 roommates would set you back $300-400/mo and $550 if you really wanted the nice place.
The thing that always bugged me about dorms is they aren't treated as regular residences. School having a week long break? You have to be out of your dorm during the break with no where to go but back to your parents. Also that 30k for a year only covers two semesters, about 6-7 months of actual housing, which works out to $2.5k/mo for board if we take half of that 30k you mentioned.
I don't know where this college is but I'm going to bet that you can get a seriously nice place, probably a small house for that amount.