This article from Research Review explains the LEED rating system for buildings. The LEED rating is based on a weighed score of sustainable site, water efficiency, energy and atmosphere, materials and resources, indoor environmental quality, and innovation and design process. A new LEED rating for retail spaces is discussed. LEED for retail weighs the scoring with energy being the largest constituent in the score. Some California cities now require all large private-sector developments to achieve LEED status.