Since 1878, the mayor of Bydgoszcz has always been inhabiting the late Jesuit college building. On an 1834 town plan, 31 individual estates were listed, 9 in the southern frontage, 5 in the western (plus the Jesuit church), 9 in the northern and 8 the eastern. In the middle of the 19th century, a new street, Jatki Street, was cut out in the north-eastern corner of the place, connecting with Grodzka Street. On June 18, 1848, following a violent storm, the Baroque steeple of the towers on the Jesuit church were destroyed. They were initially covered with cone-shaped roofs then rebuilt with Neo-Gothic features from 1880 to 1882. At the same time, the church façade was also reconstructed. In 1859, the City Council decided to erect a monument to Frederick the Great on the Market place. At the cornerstone laying ceremony on October 21, 1861, highly distinguished guests were present, among whom the King of Prussia William I and his son the prince Frederick III, both accompanied by their wives Augusta of Saxe-Weimar-Eisenach and Victoria. The monument was unveiled in January 1862, and the event was again attended by the Prussian heir to the throne, Frederick III Hohenzollern, together with his wife Victoria. On October 4, 1909, another sculpture was unveiled on the square: "Children playing with goose" or "The Well" (). This fountain with a well, realized by sculptor Karol Kowalczewski, has been funded by Alfred Kupffender, owner of the pharmacy "Under the Golden Eagle" (), located on the north-west corner of the place. In Prussian times, the Old Market Square was still the main municipal market area. Crowdy fairs were held there four times a year, and regular market every other week. Through all the 19th century, a thorough reconstruction of almost all tenements of the market place was carried out, applying Neoclassical forms until the 1850s, followed by Eclectic style made of a mix of historicism elements. In the second half of the 19th century, a few houses were demolished in the northern and southern frontages, for reconstruction purposes, replaced by buildings with Neo-Renaissance facades. The same movement happened at the beginning of the 20th century, where Art Nouveau style was applied (e.g. tenement at No. 20).