New Headquarters of the AP-HP

Work spaces open to their environment within the Saint Antoine Hospital

The Saint Antoine AP-HP hospital can be considered a real city within a city. Autonomous in its functioning and open to the neighbourhood, it has gradually become denser over the last century. The new headquarters is located on a plot of land lined with buildings (including a ground floor + 10 storeys) and informally used as a relaxation area by the hospital's employees. Respecting this place means respecting the habits of the 3 400 employees who work on the site every day. The project is compact, does not affect the luminosity of the neighbouring buildings and frees up a planted core equivalent to 50% of the plot of land that will be accessible to all. An amphitheatre is placed under this new landscape topography. The triangular and radiating shape of the building generates three directions. The new headquarters does not turn its back on any neighbouring building and all the façades are treated with the same care. The glazing is generous and the balconies flow around it, providing a uniformity of light to the work spaces and spectacular views of the busy hospital, the garden and Paris from the top floors.

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Respect for the existing environment, the preservation of views as well as optimal and flexible functionality over time are all conditions that guided the placement and volume. The design of the facades is based on a sober and largely glazed architectural reading, highlighting the transparent base and the slender balconies.

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For the balance of the site, we propose to find a new green heart compatible with the new programme.  By planting on top of all of the programmes located in the base and by reconstituting a hilly landscape, we create a gentle topography inviting people to walk on this new ground.

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A place with trees, this planted area will be the centre of exchanges. The layout of the garden is designed to increase the permeable surfaces and to accentuate the planted landscape continuity. The plant species have been chosen from among those indigenous to the Ile-de-France region.

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The continuation of our research on how to host life finds its application here through the development of a living concrete wall1 in collaboration with the contractor CBC. In continuity with the garden, this perimeter wall with a surface area of 390 m² surrounds the auditorium that carries the hill. The substrate forms a continuum, from the permeable ground to the roof garden.

1 ChartierDalix in partnership with CBC, as part of a more global research on biodiverse walls

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Paris 12




9,641 m²


CBC (Contractor), Etamine (Heq), Tess (facade), Inex (TCE), Lasa (Acoustic), ChartierDalix and Selkis (Space Planning), Alliance Economie (costing), Jean Louis Ducreux (ecologist)


€27 M before tax


Delivered in may 2022

Project manager

Tomoko Karakawa, Patrick Bourgeois, Camille Genoud


Complete (+Space Planning)


Open working and meeting spaces (two meeting rooms of 120 and 30 p.), amphitheatre (130 seats, ERP cat. 5, type L), convivial space of 130 p., garden and terrace


HQE 2016 Excellent, E2C1, Ready to OsmoZ


Takuji Shimmura, Camille Gharbi


Equerre d'argent 2022 award, category Activity