During the inter-war period, Singer-Polignac worked with Consuelo Vanderbilt Balsan and assisted in the construction of a 360-bed hospital destined to provide medical care to middle-class workers. The result of this effort is the Foch Hospital, located in Suresnes, a suburb of Paris, France. The hospital also includes a school of nursing and is one of the top-ranked hospitals in France, especially for renal transplants. It has remained true to its origins and stayed a private not-for-profit institution that still serves the Paris community. It is managed by the Fondation médicale Franco-américaine du Mont-Valérien, commonly called Fondation Foch.