A las viviendas de interes social de la Ciudadela Nuevo Occidente llegaron a vivir familias provenientes de barrios como Moravia, Santo Domingo, Popular y otros, con modelos de asentamiento, como la autoconstruccion y el loteo pirata, predominantes en la historia de Medellin. En estos barrios, los habitantes tenian dinamicas sociales constituidas, e incluso formas de produccion economica propias del entorno, como el reciclaje. El proceso de reubicacion trajo cambios en la estructura fisica de Medellin, una nueva tipologia de asentamiento de vivienda en altura y nuevos sentidos de comunidad entre sus habitantes manifestados en las formas de organizacion y apropiacion del espacio, y de participacion y convivencia comunitarias. Lo que diferencia este proceso de reubicacion de otros de naturaleza similar es que no solo produce un cambio en la calidad de vida de los habitantes reubicados, sino que comienza a reorganizar a Medellin como tal para recibir otro modelo urbanistico que seguramente cambiara desde la vision de ciudad hasta el propio concepto de comunidad en terminos de localidad. ABSTRACT In Medellin (Colombia), families coming from neighborhoods like Moravia, Santo Domingo, Popular, and others, with different long-established types of settlement like self-construction and illegal division of land into lots, moved to occupy state-subsidized houses at “Ciudadela Nuevo Occidente”. The inhabitants from the aforementioned neighborhoods had lived under particular social dynamics, and even with some forms of economic production, like recycling. This relocation process brought about some changes in the city‟s physical structure, with new patterns of settlement such as multi-storey buildings and new senses of community-belonging among their dwellers, which were visible in new patters of organization and space appropriation, as well as community participation and coexistence. What makes this relocation process different from others of a similar nature is that it did not only produce a change in the relocated inhabitants‟ quality of life, but also in Medellin itself, and this would generate a new urban development model that will for sure change not just the vision of city but also the very concept of community in terms of locality.