A nice little spot for people watching and enjoying lunch. Grab a coffee at Caribou, a juice at Jamba or a book at BookMark and enjoy the show. There could be some more tables for such a huge space, and the sound of people dragging their chairs across the floor is SO LOUD. It's weird and distracting, but other than that, it's a good spot to get away from your desk and just hang out.
Protip: When you get up to leave, do a circle through the BOA building. Rumor has it that they pump fresh air from outside into the lobby. I mean, you could go outside, but if you don't have time, it's a substitute.