Surat Diamond Bourse (SDB) consolidates India's 70,000-strong diamond community within the world's largest single-office building. Drawing from the fishbone delivery system, SDB exemplifies high-density office architecture with a central circulation spine diverging into nine towers. Functional proximities were determined by optimising travel distances from the site entrance to the farthest office module within 7 minutes. Passive design techniques enable the building to consume 50% less energy than industry green benchmarks, and it features one of the world's largest radiant cooling systems.