If you want something a bit higher than Taco Bell (~shudder~) there is the
Sunset Cantina* across the street. It does takeout or eat-in and the portions are big and good. My boss goes there for lunch all the time, and it's where we have our "office parties", but only because it's right outside our back door.
*Don't worry about the "Restaurant Closed" on the website -- it means it opens at 11:30am.