What is LEED? The Leadership in Energy and Environmental Design (LEED) Green Building Rating System is the nationally accepted benchmark for the design, construction, and operation of high performance green buildings. LEED gives building owners and operators the tools they need to have an immediate and measurable impact on their builidngs' performance. LEED promotes a whole-buidling approach to sustainability by recognizing performance in 5 key areas of human environmental health: sustainable site development, water savings, energy efficieny, materials selection, and indoor environmental quality. LEED provides a roadmap for measuring and documenting success for every building type and phase of a building lifestyle.