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Main Menu Welcome Dumbarton Oaks Park Conservancy is a charitable nonprofit established in 2010 that is working to restore one of the United States of Americas ten greatest garden landscape designs the 27acre Dumbarton Oaks Park the Park formerly part of the Dumbarton Oaks estate in Georgetown Washington DC. The estate is a milestone in the history of American landscape architecture and a landmark in our social history as it represents the finest work of Beatrix Farrand Americas first professional female landscape architect. Farrand was one of eleven founding members the only female founding member of the American Society of Landscape Architects and is regarded as one of Americas foremost landscape practitioners of the 20th century. She shattered the glass ceiling in her profession and this is her crowning achievement.