The SDB project is the world's largest diamond trading market, located in Surat, Gujarat, India. It will cover an area of 35.5 acres with a total construction area of 620000 square meters, making it the largest office building in the world. It will consist of 4500 offices with areas ranging from 28 square meters to 7000 square meters. The total construction cost of this project is approximately 230 million US dollars.