When Entegrity began to plan the retrofit of the 13,342-square-foot historic Darragh Building in 2016, it was clear to the Partners that the building should be a high-performing, net-zero building – fit to house a company that offers efficiency, solar, and sustainability services to its clients. The entire renovation was designed and executed with sustainability and historic preservation in mind. Energy modeling was used to first determine strategies to reduce energy use as much as possible, before adding in a rooftop solar array to bring the building to net zero. Energy efficiency strategies employed in this building include use of all-LED lighting, dynamic self-tinting glass, operable windows and doors for natural ventilation in the warmer months, and occupancy sensors. Other sustainability features of the building include the use of locally sourced materials where possible, preserving access to daylight and views, controllability of lighting and comfort through the use of dynamic glass and self-tinting windows, highly efficient plumbing fixtures, and native landscaping. In 2019, Entegrity Headquarters became the first LEED Zero-certified project in the United States, and the second in the world. The building has also been awarded ILFI's Zero Energy certification, and achieved LEED Platinum for new construction.