I agree about the area- you should take a step off campus! There is quite a bit around Columbia (I was delighted to see Pinkberry!).
When I visited there was also no mention of their Stadium (which is not attached to campus), the tunnels and the libraries. I did a group tour with a program I did so we did not see any of the dorms up close and personal- but things might be different with a "regular" tour. Im sure someone else could say whether tours go into dorms or not.
Also, I do believe there is some new construction on campus...