The « La Défense Ouest – Les deux Seine » CDT

Dedicated to the financial sector, the cluster of La Défense is supported by two CDT projects: “La Défense Ouest – Les deux Seine” and “Seine Défense”.
The vision of the “La Défense Ouest – Les deux Seine” CDT embraces areas beyond La Défense actual perimeter so as to consider a larger zone able to stand next to Greater Paris strategic territories, to join in the metropolis’ momentum in terms of competitiveness and job creation and to meet the expectations of its inhabitants.


In the Hauts-de-Seine “département”, the CDT project will cover four towns (La Garenne-Colombes, Nanterre, Rueil-Malmaison and Suresnes) that collectively account for 176,000 residential units, 370,000 inhabitants (197,500 of which being employed) and 175,000 jobs.

The towns of Puteaux and Courbevoie were included in the early stages of the CDT project, but Puteaux eventually did not join the Syndicat Intercommunal d’Etudes et de Programmation (SIEP) and decided to associate with Courbevoie instead to create their own project, the “Seine Défense” CDT.


Although the CDT project has, to date, not been validated, the framework agreement between the French state, the mayors of the towns and the Prefect of the Greater Paris Region was signed on April 25th, 2012.

Key objectives

The ambitions of the CDT are :

  • to gain an additional 50,000 inhabitants within the next 15 years;
  • to build additional residential units (exact numbers under discussion);
  • to maintain employment levels.

The “Syndicat Intercommunal d’Etudes et de Programmation” (SIEP) has identified 13 sites to be supported by projects (development, economic growth, infrastructure and cultural projects) such as:

  • upgrading key highways;
  • reducing urban ‘no man’s lands’;
  • encouraging large intermodal centres;
  • facilitating freight transportation;
  • creating an entrepreneurship hub (Cité de l’entreprenariat);
  • producing an inter-community environment charter;
  • harmonising existing landscape charters.

Other projects are under consideration, such as developing offices and residential units at La Défense Seine Arche, upgrading the Seine riverside and interconnecting tramways lines T1 and T2 in Colombes.

Source : Institut d’Aménagement et d’Urbanisme d’Ile-de-France (IAU)