According to a survey by the U.S. Energy Information Agency, 72% of floorstock in the U.S., accounting for 46 billion square feet, belongs to buildings over twenty years old. These older buildings consume a significant amount of energy, and implementing efficiency measures offers both onsite benefits of reduced energy use and cost, which has the following effect of reducing demand and saving wasted source energy as well. Building efficiency is crucial to reducing energy consumption, and although about 2% of commercial floorspace is newly constructed every year, most of the opportunities to improve efficiency over the next several decades lies in the existing building stock. The private development community can work together to advance the creation of healthy and sustainable development projects to green our existing building stock on a macro-level, most of which suffer from old equipment, aging infrastructure, and insufficient operations resources. From a business standpoint, the greening of buildings can drastically reduce energy expenses and create value for electricity companies by enabling efficient and timely use, improve occupants’ health and productivity, increase real estate value, enhance corporate brands, and take advantage of the thriving new market for easy-to-access efficiency products and services. This translates into savings and benefits for real estate owners, investors, occupants, energy utilities, product suppliers, and new and existing service providers. Beyond bottom-line advantages, green buildings contribute to soft value creation factors such as market differentiation, reputation, growing public awareness, tenant demand, reduced obsolescence, and lower energy cost risk. Green buildings also have higher claims of productivity resulting from better comfort and controllability of systems, good indoor air quality, improved lighting, and fewer sick days resulting from a healthier space. From an environmental standpoint, investing in building efficiency as compared to other environmental measures has proven to be one of the top carbon reduction strategies.