 In 1780 Carl von Gontard designed and started the construction of a tower, easterly adjacent to the actual prayer hall.His design of the domed towers, a second one being added to the French Church, followed the Palladian tradition and received the shape of the Parisian Church of Sainte-Geneviève (now the Panthéon), then still under construction by Jacques-Germain Soufflot.The construction of the domed towers aimed at making the Gendarmenmarkt resemble the Piazza del Popolo in Rome.