I belief the buffet mentioned is served for lunch at each location everyday of the week.
I love the Reza's on Clark. I can't say enough good things about the many well prepared, well rounded, and filling meals that I've had there at such a reasonable price. Service is always good.
I'm nearly a vegetarian, and I love their stuffed pepper entree. They're stuffed with your choice of spinach or mushrooms and cheese. They're surrounded by tomato sauce and rice. Very simple, but extremely tasty and satisying. With the soup, cheese, bread, and everything else, I always end up taking home one of the two peppers.
They have great tea and coffee. They also have a donut-like, long dessert that's very pleasant.
Although I have not been to the OakBrook location, based on the positive review here, I'm more anxious to get there. It's near my office.