Since the Covid health crisis of 2020, the sharp increase in the overall supply of office space in the Île-de-France region – coupled with consistently disappointing take-up levels – has drawn greater attention to the drag on the office market created by the abundance of second-hand buildings, many of which do not offer the types of modern features that would appeal to tenants. At the same time, despite a severe housing shortage in Île-de- France, exploitable land is in short supply. A major reason for this is national and regional restrictions meant to combat land artificialization as part of declared net-zero emission objectives.
A casual observer may think a solution is obvious: repurpose these “obsolete” office buildings and turn them into housing: an approach that would also release far less carbon than demolition. Furthermore, the “loi Elan”, adopted in 2018, provides financial extra building rights up to 30% for converting or renovating former offices into housing.
But obviously, current market reality is more nuanced. The ability to convert and repurpose office buildings clearly represents a valuable tool for urban development, consistent with the declared sustainable development objectives shared by residents, public authorities and investors. However, the ongoing office market crisis should be put into perspective: while within-a-year supply in Île-de-France reached 6 million sqm at the start of 2023, there are not as many buildings to transform and, although take-up has slowed, businesses continue to seek out suitable office space. Moreover, in addition to the various technical, regulatory and political constraints commonly being faced, financial considerations are presently often the deciding factor limiting both the number and the nature of office space conversions. It is important to keep in mind that not all transformation projects are housing related, and that office-to-residential transformation projects are only a limited aspect of overall urban renewal policies.
The fight against land artificialization is taking shape.
Ecological challenges in the context of urban development have become more prominent in recent years, with both regulatory and societal pressures now intensifying. At the national level, the Climate Resilience Law of August 2021 validated a mandatory reduction of the artificialization of natural agricultural and forest areas, with two major deadlines: 2030 for a half reduction and 2050 for achieving a net-zero artificialization. At the regional level, the Île-de-France 2040 master plan aims to reduce the rate of land artificialization by 20% per decade by developing suburban designated hubs, making these virtually the only areas where new construction would be authorized. This rate is slightly lower than the declared net-zero artificialization objectives, but Île-de-France must also address its severe housing shortage. The SDRIF 2040 project, which should be completed in July 2023, before a year of public consultations, aims to keep a 700,000 residential units per year construction goal, 30% of which will be social housing.