Each year, Apur makes a list of private residential buildings which have had difficulties. Carried out in liaison with the City of Paris, this initiative is intended to identify problems and intervene as early as possible. In 2024, 230 buildings were identified among the 49,000 private residential Parisian buildings.

The fight to combat substandard housing and run-down buildings requires a policy that is implemented constantly on a fine scale. Last year, approximately 4,000 alerts were raised by private individuals and condominiums in Paris. They were addressed to the City of Paris Departments that deal with housing problems and responded to by the Department of Housing and Habitat (DLH) in the form of a visit and if necessary, the instigation of administrative procedures to remedy the problems.
In addition to this response to alerts, the City of Paris and Apur have, since 2008, been implementing an initiative to prevent buildings becoming run-down. A statistical survey is made aimed at compiling a list of buildings that have accumulated different types of difficulties/fragilities, so that onsite inspections be carried out by agents from the technical department of housing - Ser¬vice Technique de l’Habitat - without waiting for the degradation of a building to set in.
In 2024, 230 buildings were identified based on the cross-referencing of ten or so indicators which signal potential problems, such as a building's safety or hygiene procedures, interventions by the Paris Fire Brigade, the volume of social housing applicants or unpaid water bills in a building. The identified buildings are mainly old, co-owned properties located in the north-eastern districts of Paris.