Central Park is a public park at the center of Manhattan in New York City, United States. The park initially opened in 1857, on 843 acres (3.41 km2) of city-owned land. In 1858, Frederick Law Olmsted and Calvert Vaux won a design competition to improve and expand the park with a plan they entitled the Greensward Plan. Construction began the same year, continued during the American Civil War, and was completed in 1873.
Designated a National Historic Landmark in 1962, the park is currently managed by the Central Park Conservancy under contract with the city government. The Conservancy is a non-profit organization that contributes 83.5% of Central Park's $37.5 million dollar annual budget, and employs 80.7% of the park's maintenance staff. http://www.centralparknyc.org/