This study focuses on analyzing the treatment of the irregularity of the urban popular habitat given by the successive governments of the province of Buenos Aires, Argentina, since the problem entered as an issue on the public agenda, in the mid1980s, until 2015. The different types of irregularity and their determinants are identified and then reconstruct the set of instruments that, as a toolbox, were implemented to address the problem in its heterogeneity. Then, the characterization of the three-decade cycle of Buenos Aires regularization policy, its stages, the roles assumed by the State in the face of irregularity and its general results are presented. The foundations that have sustained these interventions for more than three decades ...