If any project has the distinction of being the most challenging as well as the most satisfying one for ARK, it is the Bharat Diamond Bourse in Mumbai. It is a mammoth project spread over 20 acres with two million sq ft as built-up area enclosed within eight towers. The project had started in the 1980s and had changed many hands before it finally progressed under ARK. The structure had to be pulled down and restructured amidst briefs that was not always final. With several limitations and parameters, the work was finally completed in 2011 and the complex is now resplendent for its clear glass walls.