This article explores the All-Day Neighborhood Schools (ADNS) program, operated as a partnership between the New York City Board of Education and local philanthropists from 1936 to 1971. Designed to expand the resources available to children and parents, the program included after-school activities, additional teachers, professional development, social workers, and parent engagement at fourteen public elementary schools across the city. Through a study of two program sites, I examine how this public-private partnership functioned, and trace changes in the motivations of its leadership, from a focus on recreation and democracy during World War II, to juvenile delinquency prevention, to compensatory education. I argue that ADNS's ability to transform public schooling in New York City was limited by its separation from the rest of the school system, which came about through its dependance on outside philanthropy and its consistent formulation as a supplemental program rather than as a fundamental part of children's education.