Bouygues Immobilier is a leading private property developer in France and Europe, with 1,908 employees at 31 December 2017 and sales of €2,712 million in 2017. With 39 branches in France and four outside France, Bouygues Immobilier has nearly 60 years' experience in developing residential, corporate and commercial projects in more than 250 towns and cities. Bouygues Immobilier has a strong commitment to innovation and sustainable development and therefore seeks to provide better quality of life over the long term for all its customers by making their experience of the buying process and the use they make of the living spaces and services created for them as pleasant as possible. Bouygues Immobilier is the first developer to be certified ISO 9001 in France, NF Habitat HQE, and Top Employer France 2017, and to win the 2016 prize for the best customer relations awarded by the French Customer Relations Association (AFRC).
Tour D² combines high architectural standards and innovative design. It has received the HQE® (High Environmental Quality) label and is certified "Very Good" under Breeam® standards. Furthermore, it is fitted with a Twin® lift system, where two independent cars occupy the same lift shaft - reducing the area of the service core and providing more usable floor space. This is the first time that such a system has been implemented in France. For user comfort, the building features air handling units with energy recovery and a light harvesting system, which automatically adjusts artificial lighting to levels of natural light and occupancy. Total building weight has been cut by 30% using a composite floor system containing steel joists and participating decking supporting concrete.
With the tower's surroundings redeveloped by La Défense Seine Arche public development authority (Epadesa), Tour D² has created pedestrian connections between La Défense and the municipality of Courbevoie, thus helping to repurpose the existing ring road as an urban thoroughfare. The project was financed by Sogecap and developed jointly by Bouygues Immobilier and Sogeprom. This operation is part of the La Défense Renewal plan that started in 2006, which calls for the construction of an additional 150,000 m² through demolition–construction and extension projects.