Union Investment has signed a 2,112 sqm office lease with Caisse des Dépôts at the Audessa building in Lyon’s Part-Dieu district, marking the first major letting following the asset’s recent repositioning.

The French public financial institution will occupy the entire fourth floor and half of the third floor under a nine-year agreement. The property is located in Lyon Part-Dieu, widely regarded as one of France’s most established and competitive office submarkets.

Union Investment acquired the building in 2022 for its UniInstitutional European Real Estate fund. Previously serving as the headquarters of electricity transmission operator RTE, the asset has since undergone a comprehensive redevelopment programme. The works included technical upgrades and environmental improvements, alongside an extension of the building.

Audessa now offers approximately 13,000 sqm of total leasable space. The refurbishment introduced a range of outdoor amenities, including a landscaped rooftop terrace with views towards Mont Blanc, terraces on each level, and a private garden area.

According to Union Investment’s French management, discussions are ongoing with additional occupiers. The company noted that future availability of prime office space in Part-Dieu may become more limited as the district continues its transition towards a broader mixed-use urban model, with a stronger emphasis on residential development.

The transaction was brokered by JLL. Legal advice to Union Investment was provided by August Debouzy.