"The Surat Diamond Bourse" (Offices and SDB) in world in The Surat, Gujarat, India.
Surat Diamond Bourse: "Within the confines of the wings are 4717 offices for 67,000 diamond specialists, including cutters, polishers, and traders. Office sizes range from 28 square meters to over 10,500 square meters, along with 131 elevators."
Surat Diamond Bourse (SDB) is a diamond trade centre located in Surat, India and designed by the architecture firm Morphogenesis. It is the world's largest diamond trading hub with a floor space of 660,000 square metres (7,100,000 sq ft). The building is the world's largest office building, ahead of The Pentagon.wiki