The Surat Diamond Bourse (SDB), a diamond trading center located in Surat, India, has surpassed the Pentagon for the title of the world's largest office building. The SDB boasts 659,611,584 square meters of floor space compared to the 622,450,368 square meters of the United States Department of Defense headquarters.


This business complex consists nine towers on 15 floors that are interconnected and 131 elevators. It also contains 4,500 diamond dealer offices. The project includes conference halls, multi-purpose halls, restaurants, banks and retail stores, all, of course, fully secured.