This chapter explores 'gated community' refers to a closed housing development, to which access is restricted to the residents and their guests. It presents some facts about the context and extent of this gated urbanisation around Buenos Aires, and its social consequences. The chapter focuses on the example of the municipality of Pilar, 50 km north of Buenos Aires, and an epicentre for the gated communities' boom. It discusses the impact of the private urbanisations and look at how the local government responds to this new challenge. The chapter suggests that the gated community developments in the Metropolitan Area of Buenos Aires were a massive phenomenon in the last decade, and that they strongly modified the metropolitan landscape. It shows that the risk of moving toward a dual city, where gated communities exacerbate social contrasts, in a period of unbalanced economic growth, thereby creating deepened socioeconomic inequalities.