though students may request a suite with same-sex/gender roommates. Sustainability An 1852 dormitory, North Hall has been extensively renovated, making it the oldest building in the United States to meet the LEED Gold Standard for sustainable construction. North Hall's energy self-sufficiency includes solar panels on its roof, and geothermal energy for heating and cooling. About 25 geothermal wells were sunk 600 feet deep on the lawn near North Hall to supply water pumped through the building to maintain livable temperatures. Antioch College also has a college farm. The farm contains a large crop growing area, a hoop house, and pasture for sheep and chickens. The farm is used as a living laboratory where Antioch students learn about sustainable farming methods such as organic farming and permaculture, and despite run-ins with animal rights activists provides meat and other ingredients for the campus dining program. In 2014, Antioch installed a five-acre solar array adjacent to its farm in the South Campus. Approximately 3,300 solar panels generate 1.2 million kilowatt hours of energy annually. In 2018, the Association for the Advancement of Sustainability in Higher Education (AASHE) awarded Antioch College Silver status in its Sustainability Tracking, Assessment & Rating System (STARS). AASHE also named Antioch College as a top performing institution in its Sustainable Campus Index in the categories of Grounds (five-way tie for second place nationally) and Food & Dining (seventh place nationally). The college is listed 188th among the Sierra Club's Cool Schools for 2018, and 244th for 2021. Glen Helen Nature Preserve The Glen Helen Nature Preserve, donated to Antioch College by alumnus Hugh Taylor Birch in 1929, is a thousand-acre nature preserve owned and managed for many years by the college. The Glen encompasses 25 miles of footpaths, forests, waterfalls, and the springs for which the town of Yellow Springs, Ohio is named. The grounds are open to the public. The Glen has an Outdoor Education Center founded in 1956 which hosts a variety of programs throughout the year, including programs on geology, wildlife ecology, and environmental education. There is also an accompanying Raptor Center whose purpose is the care and rehabilitation of injured birds of prey. The Raptor Center has a variety of hawks, owls, falcons, and resident eagle on display. Glen Helen was closed to the public on March 25, 2020 in connection with the COVID-19 outbreak. The Antioch College Board of Trustees stated in May, 2020