I've been a fan of Zaytoon ever since they opened their original restaurant on Market Street. Their hummus is the best in town. They have a wide selection of wraps, salads, and lots of vegetarian options. I recommend the Sample Plate which has hummus, baba ghanouj, falafel, pita and Greek salad.
The atmosphere is like a slightly upscale cafeteria and is a great place to grab a quick and healthy lunch with coworkers. Zaytoon is located in a large office building and is open from 9:00-4:00 on weekdays.