P.S. 20, Rivington Street, 1920.

P.S. 20 opened in 1899 when the Lower East Side was a neighborhood of poor immigrant families living in crowded, dark and decaying tenements.

In contrast, the public schools designed by C.B.J. Snyder offered a rigorous education in classrooms that maximized natural light, fresh air and ventilation. The fifth story of P.S. 20 contained a library, reading room, separate gyms for girls and boys and manual training rooms for carpentry, drafting and modeling. The rooftop playground offered a large space for a variety of open-air activities, far above the congested and dirty streets below.

The red-brick school later became the Rivington House, a nursing home which provided hospice care to AIDS patients. The building was sold to a private developer in 2015, after deed restrictions were lifted, leading to public outcry and scrutiny of de Blasio administration practices.