While in town for a meeting, I took the light rail down town to check out the scene. I stopped by this Starbucks bordering a bustling plaza.
Pros: Super friendly staff - interested in what brought me to town, but not in a creepy way. Also, ample seating - outdoors on the plaza, and plentiful seating inside, including large community tables and smaller standard tables.
I would definitely come here to get work done, hang out with friends or just people watch.