"In 2010, the emirate of Abu Dhabi implemented mandatory minimum efficiency standards for all new residential and commercial buildings through the Estidama Pearl Rating System. The minimum standard (Pearl 1) improves building efficiency by 30-35% efficiency vs. the existing baseline. Higher mandatory standards (Pearl 2) were set for public buildings. The system also sets what are effectively mandatory energy efficiency standards for public spaces and systems in planned developments, including mixed-use zoning, shading, and public transport links."
(Source: http://unfccc.int/resource/docs/natc/arenc3.pdf)