Located on the banks of the Seine, on the edge of the Chemin-de-l'Île departmental park, this complex has transformed an industrial wasteland into a 125,000 m² low-carbon office campus made of solid wood (five new buildings and two renovated buildings) within a large 9-hectare park. Designed by architects François Leclercq (Leclercq Associés), Nicolas Laisné (Nicolas Laisné Architectes), Dimitri Roussel (DREAM) and Hubert & Roy, these offices are built using CLT solid wood with innovative low-carbon technology developed by WO2. Work on the complex began in October 2020 and was completed at the end of 2024.

The materials, construction methods, architecture and operation of the buildings have been designed to reduce the campus's carbon footprint throughout its life cycle. In total, this footprint is 48% lower than that of a recent conventional building (663 kg CO2/m2 vs. 1260). The use of bio-based materials (solid CLT wood), bioclimatic design, reuse and on-site renewable energy production (geothermal energy) make the site a model of sobriety and sustainable development: energy consumption is 2.5 times lower than that of French offices (-62% on final energy compared to the average). The ten geo-energy wells alone cover 80% of the site's heating and air conditioning needs.

The scale of the project will also make it possible to develop a circular economy cycle around urban agriculture (rainwater reuse, waste recovery) and to directly involve employees in understanding and implementing initiatives that promote biodiversity and sustainable development. The park includes a 3,200 m² vegetable garden and orchard, which will produce 10 tonnes of fruit and vegetables per year.

Arboretum was designed to offer a multitude of working possibilities: meeting rooms in the park, large office spaces bathed in natural light with 3.10-metre-high ceilings, spacious terraces on each floor designed as an extension of the offices and connected by external staircases, eight restaurants, 1,900 m² of indoor sports facilities, a conference and meeting centre, and an open-air amphitheatre that can accommodate 600 people. These offices allow for constant contact with nature.