Chicken biryani of Mezban is one of the must try item in Kolkata. As i have not tried anything else over here I can't comment on any other items. Its located at a very busy joint at the corner of Rippon Street. And it stays open till late in the night.
5th floor is dedicated to BJN Group and they have 3 awesome restaurants, by name Cafe Masala, Vaayu, and Aromas of China. Otherwise the mall is not that great or interesting. Two floors are occupied by Tata's Croma and two floors are closed (I think they are renovating them).
In general food was good. I tried buffet here, and I am satisfied with the variety and number of items served. In weekend buffet they serve tandoori food which is worth trying. Variety and number of desserts they are awesome.
On the cost side, the weekend buffet is Rs. 350 which I felt to be on bit higher side. With two types of taxes they charge the weekend buffet for two comes around Rs. 900/-.
This is one of the oldest mosque in India. This mosque is around 250 years old. The architecture of this building is very unique. The pillars of the main building of this campus is fixed using nuts & bolts. Amazing looks and peaceful place. One of the very important landmarks of Chennai.