The general aim of this project is to study the transformations in Siza’s collective housing over the past 5 decades, focusing on the linked analysis of: a) the projects (social and private housing) and the respective social and urban condition framework; and b) their residents and the relationships they develop with the projected space. The research follows an intensive methodology: comparative study of 3 Siza’s cases/collective housing projects. Each represents a moment on the architect’s professional life and corresponds to a moment in the life of society and the city; the 3 together, and their temporal sequence, represent (part of) Siza’s trajectory and that of contemporary society and of the city. The cases are: 1. Bouça/Porto - started following the 1974 revolution. Symbolising the Revolution, Architecture and the Right to the City when it was in decay; 2. Terraços de Bragança – Chiado, Lisboa, started in the 1990s. Symbolising the national real estate boom, modernization launch and procrastination of urban renaissance; 3. Building 611 West 56th Street – Hell’s Kitchen, New York, began in the 2010s. Symbolising hyper-globalisation, the rise of the city, financialisation of real estate and the incontestability of the value of architectural authorship. The greatest innovation in the proposal is in the temporal sequence of the 3 cases, which allows us to answer the following questions: what has changed in the production and appropriation of Siza’s houses and how do these changes relate to social transformations and the architect’s career? Who promoted the housing at the different times, locations, to what end and for whom? What are the formal, functional and contextual differences/similarities between the projects? How have transformations in the urban context impacted on the occupation of dwelling in social, use and value terms? What is the social profile of residents, their evolution and differences between cases? How do these residents live in Siza’s houses? W...