Reconstruction of City Hall lasted from 1873 through 1892 (19 years) and was directed by architects Théodore Ballu and Édouard Deperthes, who had won the public competition for the building's reconstruction. Ballu also designed the Church of La Trinité in the 9th arrondissement and the belfry of the town hall of the 1st arrondissement, opposite the Louvre's east facade. He also restored the Saint-Jacques Tower, a Gothic church tower in a square 150 metres to the west of the Hôtel de Ville.
The architects rebuilt the interior of the Hôtel de Ville within the stone shell that had survived the fire. While they rebuilt Hôtel de Ville –from the outside– a copy of the 16th-century French Renaissance building that stood before 1871, the new interior was based on an entirely new design, with ceremonial rooms lavishly decorated in the 1880s style.
The central ceremonial doors under the clock are flanked by allegorical figures of Art, by Laurent Marqueste, and Science, by Jules Blanchard. Some 230 other sculptors were commissioned to produce 338 individual figures of famous Parisians on each facade, along with lions and other sculptural features. The sculptors included prominent academicians like Ernest-Eugène Hiolle and Henri Chapu, but easily the most famous was Auguste Rodin. Rodin produced the figure of the 18th-century mathematician Jean le Rond d'Alembert, finished in 1882.