On December 28, 2009, the New York City Mayor’s office passed a set of four groundbreaking bills known as the “Greener, Greater Buildings Plan (GGBP)” that aim to reduce the energy consumption and carbon footprint of New York City’s existing buildings. The electricity, heat and hot water used by buildings in New York City generate 74% of the City’s greenhouse gas emissions. The laws affect buildings larger than 50,000 gross square feet, creating a stricter energy code and requiring building owners to perform benchmarking, energy audits, retro-commissioning and lighting upgrades.