Something like 80% of freshman live in on campus housing. 40% of the people who live off campus have "walking commutes". The amount of extra on campus housing and near campus apartments since I finished in '03 is crazy.
+1 and that is still growing. There are two large new apartment buildings in Stadium Village for this Fall (one where the former Campus Pizza was located and one where the former Oak Street Cinema was located). I just saw that more are coming. Opus is building another student apartment building on Washington almost directly across from the hotel (former Radisson now University Hotel or something like that). Once the light rail is done and Washington is closed to only pedestrians and the train in that stretch it will be quite the area. The area around campus is unbelievably different from the time I went to school there in the 90s. No way is it a commuter campus anymore.