I'll admit, I've never actually walked into the campus at that part. Just.. around it. I have a thing where I think I'll get in trouble for walking through public places like that.
I had a friend that worked at the First National Tower and he kept telling me I could walk through the entire tunnel system they had, all I would have to say is I thought it was public if they didn't like me there.. I was like nah i'm fine
I work in the tower and use the tunnels to walk to the Park 6 when it's cold out. We have security that walks the tunnels and watches cameras but mostly to keep out smelly bums that like to piss in corners.