More than one-third of energy is consumed in buildings worldwide, accounting for about 15 percent of global greenhouse gas emissions. In cities, buildings can account for up to 80 percent of CO2 emissions. The built environment is therefore a critical part of the climate change problem – and solution. Most existing buildings were not designed for energy efficiency, but by retrofitting with up-to-date products, technologies and systems, a typical building can realize significant energy savings. Improving the energy efficiency of buildings is a priority for reducing both greenhouse gas emissions and energy costs. We provide support to building owners such as city governments, commercial portfolio owners, schools, universities, and public housing authorities in identifying, designing, and implementing large-scale energy efficiency retrofit projects and brings the owner together with the necessary contracting and financial firms for implementation.