How does public policies act towards so-called « dilapidated condominium »? In France, housing in « copropriété » (condominium, CIDs or HOA in English) becomes common in the 60s and 70s. In the late 70s, a few local public actors address the problem of some multi-owned residential developments facing a bundle of difficulties, such as decrease in real estate values, poorer inhabitants and owners, lacks in maintenance or management conflicts. In 1994-1996, the concept of « copropriétés dégradées » (dilapidated condominiums) enter in French national laws and public policies. Both laws and public policies are reinforced in the 2000s and 2010s, creating what seems to be one of the most developed program aiming poor multi-owned residential developments in OCDE countries.This PhD is based on an international literature review (the first one about difficulties faced by multi-owned housing) on archives stored by local authorities of 3 agglomerations (Lyon, Marseille, Grenoble) and on 50 interviews. It tracks local public policies towards so-called “copropriétés dégradées” at a building, communal and intercommunal level during 40 years (1975-2014). The research shows how residential developments were investigated, categorised and invested by local authorities in Lyon, Marseille and Grenoble.The proposed results are related to both condominium management and French public policies. A new form of condominium management, called malevolent management, is observed and conceptualised. The growing difference between Marseillian and Parisian degraded condominium (facing major safety issues) and Lyon’ and Grenoble’ ones (facing refurbishment issues) is documented and linked to the differences between the local public policies. The role of the national policy is also discussed: instead of reducing the differences between cities, it appears to enhance them.