You just picked the top programs in the conference, and haven't looked at their facilities. Wisconsin's are not at all impressive, PSU has really flashy, but somewhat barebones facilities, and MSU has a really impressive atrium/museum, but in terms of functional space, not so much. And Nebraska's had a major renovation about 7 or 8 years ago, and probably had some of the best facilities in the country at the time, but have fallen behind a lot. It doesn't appear they have made a major additions/alterations since then or have any planned.
PSU will probably move up the ladder, as they probably will have new space incorporated into the Beaver Stadium renovation, but that is still something that is 4 or so years from completion