The ALER Institute (Azienda Lombarda per l’Edilizia Residenziale), founded in the early 1900s due to significant immigration driven by Milan’s industrialization, has played a crucial role in addressing housing needs. ALER Milan developed a public housing stock unmatched in Europe, with approximately 70,000 owned dwellings, and an equal number alienated over time. Guided by the mission “to provide hygienic and affordable housing for the less affluent classes,” ALER has significantly impacted Milan’s socio-urban landscape.