Hi, I'm Kelsey Shane, Tom Shane's daugheter. The environment at the corporate office is inbetween business casual and dressy. People generally wear slacks and a nice shirt, rarely suits, and unless you're working in the back room, rarely jeans.
We frequently do happy hours and other fun events outside of work. In fact at least once a month we also do pot lucks and other smaller events during the days, too. It's a very friendly place to work, although it can certainly be stressful.
Hope this helps:-)