The site is located in the crossroad of two important streets of the Ensanche, designed in 1862. The restrictive city rules compel to repeat the shape of the neighbouring walls, reducing penthouses according to a curved directive, chamfering the corner and building a tower on it.
The building concentrates services and communications in a vertical spine attached to the longest party hedge and generates seven open floors assigned for offices. Above this, there are two floors for local representative and institutional use. The board hall takes up the double height of the tower. The assembly hall, its lobby and its appendages are situated in the first basement. Further below there are two parking floors and one fourth level for archives. The car lifts allow access to all the basement levels.
The double facade solves not only urban requirements but also those concerning energetic, fire-resistant and acoustic insulation from outside. This climatic improvement enables the elimination of the conventional air-conditioning installation as well as the false ceiling. Thus, the sound produced by the building is reduced, air recirculation in workplaces disappears, with a significant increase of health conditions.
