This article addresses the conditions of possibility for the emergence of the Day Hospital of the “General Manuel Belgrano” Hospital in Greater Buenos Aires in 1985 (Argentina). Although day hospitals have a long history at international level and some previous experiences in the country, local studies around this problem are scarce. That is why this work, from a historical-critical perspective, tracks the facility in its origins and in different geographical scenarios, addresses some key experiences in the province and the referents of the time, to approximate the framework that gave rise to the experience of Belgrano. The importance of this case is that it was a beacon institution during the time it was open, as it became a reference for clinical care and professional training. It was also a source of inspiration for the creation of other facilities also dedicated to the psychoanalytic treatment of psychosis in Argentine.