In 1958, deputy Alfredo Longo, (born in Caseros), presented a project for the creation of a new partido called "Caseros", composed of the localities of Santos Lugares, Ciudadela, Sáenz Peña, El Palomar and Caseros, which was completed the following year with the enactment of Law 6.065 of Buenos Aires Province by which the October 15 partido was created Tres de Febrero, separating of the San Martín partido, in the area bounded by General Paz avenue, Ferrocarril General Urquiza, Triunvirato street to the Reconquista River, the Reconquista River to Díaz Vélez avenue and thence to the General Paz avenue.