Collective housingHousing constituted a field of experimentation in the development of modern architectureArchitecture in Latin America. The so-called “streets in the air” were devices employed by architects throughout this process, some of the most remarkable examples are Bonet’s Casa Amarilla (Argentina, 1943), Reidy’s Pedregulho (Brasil, 1946), Pani’s Miguel Alemán (Mexico, 1947), Taba Guaianases by Bo Bardi (Brasil, 1951), and Bresciani, Valdez, Castillo and Huidobro’s Vecinal Portales (Chile, 1954). By the end of the sixties, when Latin America was experiencing its last generation of massive modern housingHousing complexes, the “streets in the air” were performing as elevated spatial networksNetworks. This chapter argues that the “streets in the air” mechanism represented the last great effort to redefine modernism’s relationship between social housingHousing and the city.