Federally funded ‘urban rehabilitation’ began with the Housing Act of 1954 in the United States. Baltimore's Harlem Park was selected to pilot this experimental programme; a logical choice seeing how the pilot largely built on a programme dating from the prehistory of legislated urban rehabilitation that originated in Baltimore. This article lays bare the history of this programme, known as the ‘Baltimore Plan’, which offered empirical evidence that substantiated the potential of participatory urban planning. Beyond transferring upon minority communities a level of control over housing that black communities had seldom possessed before, the Baltimore Plan also constituted in an alternative to public housing.