Casa Colectiva Valentín Alsina, Residential building in Parque de los Patricios, Buenos Aires, Argentina

Casa Colectiva Valentín Alsina is a ground-floor-plus-three-story residential building facing Parque de los Patricios. Its 70 apartments of two, three, and four rooms open onto galleries around two rectangular inner courtyards. The main entrance on Avenida Caseros leads directly to the first courtyard, flanked by commercial units; there is no elevator, and upper floors are reached by stairs.

The Casa Colectiva Valentín Alsina was the first project of the Comisión Nacional de Casas Baratas, created by National Law No. 9677 of 1915, an initiative of Córdoba deputy Juan F. Cafferata. Its first president was Marcelo Torcuato de Alvear, later president of Argentina. Workers rented the flats from the commission until its dissolution in 1944, when tenants could buy their homes. In 2008 the building was listed as architectural and historical heritage of Buenos Aires.

The building's name honours Valentín Alsina, a 19th-century Argentine statesman, and its 70 units were first rented to workers by the CNCB. A plaque on the Avenida Caseros facade records the 20 September 2007 declaration as a site of cultural interest by the Buenos Aires Legislature. The two internal courtyards and their galleries remain the shared space of the complex.

The building sits in an established residential neighborhood and can be accessed from multiple streets around the block. Since people live here, viewing the structure is best done from the exterior or from any public areas that may be open.

The building's heritage protection came in two steps: on 20 September 2007 the Buenos Aires Legislature declared it a site of cultural interest, and on 25 September 2008 city law no. 2857 listed it as architectural and historical heritage with structural protection. A plaque on the facade records the 2007 declaration.