The Book HU: Common Spaces in Housing Units compiles the research in social housing done by Rozana Montiel Estudio de Arquitectura (REA). The post-its are graphic aphorisms collecting the observations and solutions reached in three of our rehabilitation projects commissioned by INFONAVIT: “Common-Unity” in Mexico City, “Court” in Veracruz, and “Fresnillo Playground” in Zacatecas. Our design work provides a non-linear reading of the three projects and records both a process and a result. The book is a guide to the texts and sub-texts of public space in social housing, where redrawing becomes an exercise of transforming space into a habitable place.