Between 1867 and 1876, together with Gustave Eiffel and Eugène Bonté, he worked on rebuilding the church of Notre-Dame-des-Champs, which had been destroyed during the Revolution. In 1878, he was commissioned by Maria Brignole Sale De Ferrari to build the Ferrari Hospice [fr] for retired domestic workers, in Clamart, a project which occupied him for ten years. Shortly after, she also commissioned him to design the Palais Galliera and supervise its construction, which would occupy him until 1894.