Immeuble Molitor is an apartment building designed by Le Corbusier and Pierre Jeanneret and built between 1931 and 1934. Located at the border between the city of Paris and the commune of Boulogne-Billancourt in France, it has been listed along with 16 other architectural works by Le Corbusier as a UNESCO World Heritage Site. The design was constrained by the narrow (12 m) and deep (24 m) configuration of the site and by strict zoning codes, which specified the parapet height, conformance to the existing street wall, and even the placement of the balconies and bow windows. Nevertheless, the architect’s inventiveness is evident in the all-glass facades. Identical on both elevations, contemporary to Bernard Bijvoet’s Maison de Verre, but Le Corbusier departed from glass-brick-only prototype by the addition of transparent openings. Externally the facades offer a contrast between solid glass bricks and transparent windows, but internally the apartments are flooded with light across the entire wall.