BARWA Real Estate Company (BARWA) and Qatari Diar Real Estate Investment Company (Qatari Diar), two of the leading real estate companies in Qatar, have announced their implementation of green building principles by adopting the Qatar Sustainability Assessment System (QSAS) to implement green buildings principles in all of their future projects. QSAS was developed in cooperation with T.C. Chan Center for Building Simulation and Energy Studies at the University of Pennsylvania ...