I just found this place in, of all things, the former office of a parking structure. The kabobs, salad and rice are fantastic (I'm Middle Eastern and know my kabobs!). The chicken kabob is especially delicious (marinated in some lemony marinade). It's best to call to order 15 minutes ahead of time because they grill each kabob to order and the place is too tiny to accomodate the loitering people who didn't call ahead.
It's on province street which is between School and Bromfield, parallel to washington and Tremont. The web-site is http://www.pitakabob.com/.