The renovation and remodelling of an existing 1960's triform tower in La Defense to modernise and upgrade the office space. Battle McCarthy were invited by SOM to join them at competition stage to help inform the shaping of the tower and devise low energy strategies to meet the stringent brief.

Although the tower could grow in both height and within the plot envelope the overall useable office space could not increase. This allowed the top of the tower to become an energy producer, in order to reduce the reliance on mains supplies of electricity and chilled water.

The brief specified the creation of a high quality office environment, and a tower of architectural expression and integrity.