Fenoglio was especially known for the number of Art Nouveau apartment buildings during this period: Casa Rossi Galateri (1903), Casa Rey (1904), Casa Boffa/Costa (1904), Casa Macciotta (1904), Casa Balbis (1905), Casa Ina (1906), Casa Guelpa (1907), and the council houses of via Marco Polo (1904), realized in collaboration with the architects Vicary and Molli.