Laprade believed in variety and complexity of the urban environment rather than uniformity, and was opposed to vandalism in the name of development of old quarters.[22] He followed both traditional and modern styles. In some of his urban development work such as in Gournay-en-Bray (1942) and the old center of Le Mans he used a picturesque style. He used modern designs for commercial and industrial projects, which included the Citröen garage, rue Marbeuf (1928), Génissiat dam on the Rhône (1939-1950), Roselend dam at La Bâthie (1954-1961) and the development of the Renault factories on Seguin island at Boulogne-Billancourt (1944-1951).[1]