In 2009, Brazil launched a low-cost housing program to fill a deficit of seven million homes. The publication 'Minha Casa - Nossa Cidade. Innovating Mass Housing in Brazil', produced by the MAS Urban Design Program, examines the project at a critical time and attempts to hack the production of mass housing and tackle the profound social changes currently underway in Brazil. In three chapters, the book reviews the history and implementation of the government program, highlights the ingenuity of "Popular Brazilian Architecture," and presents design proposals by MAS Urban Design for low-cost housing. Building on the program's success in broadening access to housing, Minha Casa - Nossa Cidade puts forth a vision for the city as a common project and the transformation of monotonous urban areas into popular neighborhoods - living environments that can be appropriated according to individual as well as collective needs.