Central Park Conservancy (1980)
New York City's Central Park was deteriorating in the 1970s. A group of citizens formed the Central Park Conservancy in 1980 to raise private funds and eventually took over management of the park from the city.
The Conservancy raised hundreds of millions of dollars and restored the park's landscapes and facilities.
The model of nonprofit stewardship of public parks became a template for cities nationwide, though it raised questions about private control of public spaces.
Sullivan Field's arrangement mirrors the public-private stewardship model, with a nonprofit managing daily operations while the city retains ownership and final authority.
