Teams from Bouygues Bâtiment Ile-de-France handed over roughly 1,000 keys and technical literature documenting the construction and operation of the building. The First Tower is owned by Beacon, which will be responsible for both maintenance and sales.
The project, worth more than €300m (£265m), began in 2008 and lasted three years, with 1,000 people working on-site at peak periods. Work has involved adding 10 storeys and a 40m-tall screen to the tower, raising the tower’s height from 155m to 230m and making it the tallest building in France.
One of the wings has been lowered, to achieve a 10-storey stepped cut-back. Overall floor space has been increased by about 10% to 87,000m2. The entire structure has been reinforced and the building skin rebuilt with approximately 40,000m² of glazing and curtain walling, including 20,000 m² of naturally ventilated double-skin facade.
Bouygues Construction pooled its resources in geotechnical investigations, special foundations, structural design of high-rise buildings, structural steelwork, facades, prestressing and renovation for the project. The First Tower is the first refurbishment project in France on such a scale to have been awarded High Environmental Quality (HQE) certification.