On December 30, 2021, Gecina signed a nine-year lease with Keolis for around 6,000 sq.m of the Sunside building in La Défense. Keolis will be transferring its headquarters to Sunside. This building, with 62% of its space now let, will be made available during the second quarter of 2022.

Located in La Défense, outside the Boulevard Circulaire ring-road, the 9,500 sq.m Sunside building, delivered during the second half of 2021, has benefited from a full renovation. It offers a comprehensive range of services (company restaurant, concierge desk, YouFirst Café, parcel lockers, etc.) that can be accessed with the YouFirst Bureau mobile app, rolled out since November last year. The asset is also HQE Excellent and WiredScore certified.