Paris

Paris Nord-Est (18th, 19th, 20th)

The most housing reservations for bail réel solidaire, the largest rail-land quarters and three of the City's conversion sites sit here.

• 68 of the 113 bail réel solidaire reservations in the PLU are in the 18th, 19th and 20th
• Hébert (1,160 homes), Gare des Mines (880) and Chapelle Charbon (375) are in progress
• 970 empty ground-floor units in the 18th alone — the most of any arrondissement (Apur, 2023)

Risk: Much of the land is in long rail and ZAC operations already allocated to developers and social landlords.

Paris Centre Ouest (8th, 16th, 17th and the QCA)

Offices are emptying fastest here as new buildings deliver into a weak market, and the 8th and 16th carry the most housing reservations in the PLU.

• Immediate office supply in Paris Centre Ouest up 44% in a year (CBRE, Q2 2026)
• Vacancy 6.5% in Q1 2026, up 1.7 points in a year
• 157 PLU housing reservations in the 8th and 16th

Risk: The highest office rents and values in France; owners refurbish rather than convert, so a cooperative needs a public partner to compete.

Paris Sud (12th, 13th, 14th)

The most public land without a facility on it, former hospital and rail sites, and the most housing already created by conversion.

• 126 public-owned plots of 500 m² or more with no listed facility (Apur parcels)
• About 109,000 m² of housing created by conversion permits of 300 m² or more since 2013 (Sitadel)
• ZAC Saint-Vincent-de-Paul: 618 homes on a former hospital

Risk: The big sites (Saint-Vincent-de-Paul, Paris Rive Gauche, Bercy) are run by public developers with allocated programmes.

Paris Centre (1st–4th)

Public headquarters and ministries are being turned into homes here, so the owners to approach are the State, AP-HP and the City.

• Former AP-HP headquarters: 30,000 m², 48 social homes, completion end-2028
• Morland: 16,280 m² of housing created from former public offices (Sitadel, completed)
• About 53,000 m² of housing created by conversion permits of 300 m² or more since 2013

Risk: Small plots, listed buildings and very high values; most large public buildings have already been allocated.

Foncière de la Ville de Paris (community land trust, OFS)

The City's land trust keeps the land and sells homes under bail réel solidaire at about €5,000/m². A cooperative can ask to be the operator of a BRS lot or partner on a BRS-reserved plot rather than compete for market land.

Ville de Paris — PLU housing reservations

819 plots carry a reservation for social, intermediate or BRS housing (113 of them BRS). When one of these buildings changes hands or is redeveloped, the programme must follow the reservation — a cooperative with a BRS or social partner fits it by design.

Ville de Paris — calls to convert vacant offices (Réinventer Paris)

The City runs calls for innovative urban projects on offices, garages and stores it or its partners control; ten sites have been offered so far, including a bail réel solidaire scheme of six homes. Watch for the next series and bid with a social-landlord or OFS partner.

The State (Direction de l'immobilier de l'État) — discounted public land

State land can be sold below value for social housing (the 'Duflot' discount): the former ministry at 10 rue Saint-Dominique went for €56.72 million less. Apur's parcels show 47 large State plots in Paris with no listed facility — a list to raise with the City and the prefecture.

AP-HP, SNCF and RATP — operational land

Hospital, rail and transport bodies release sites through calls for projects (La Rochefoucauld, Fer à Moulin) and joint operations (Hébert, Les Messageries, Ateliers Vaugirard). Their next disposals appear first in Apur's project database.

DRIHL / DRIEAT — office-to-housing call (AMI TBL)

The State's Île-de-France call backs conversion projects with FNAP social-housing grants (€10 million in 2025), a €5,000-per-home interest rebate from the Banque des Territoires and the Fonds vert brownfield money. 61 of 101 applicants were selected.

Diocèse de Paris

The diocese is redeveloping some of its property with social housing (Maison de la Visitation, 92 homes). Diocesan associations own further plots in Paris — ask about convents and parish buildings, not only churches.