In 1931, he developed a visionary plan for another city Algiers, then part of France. This plan, like his Rio Janeiro plan, called for the construction of an elevated viaduct of concrete, carrying residential units, which would run from one end of the city to the other. This plan, unlike his early Plan Voisin, was more conservative, because it did not call for the destruction of the old city of Algiers; the residential housing would be over the top of the old city. This plan, like his Paris plans, provoked discussion, but never came close to realization.