Open Space Alliance for North Brooklyn (OSA) is a non-profit park conservancy that partners with the NYC Department of Parks & Recreation to maintain and program more than 45 parks and playgrounds in Williamsburg and Greenpoint, improving the lives of over 200,000 North Brooklynites. OSA’s mission is to serve all North Brooklynites, especially those in underserved communities. OSA’s service is essential because North Brooklynites suffer from one of the lowest ratios of open space to population in the city. OSA is unique as it is the only major park conservancy serving a neighborhood, not just a single park.