A two-storey extension along Marischal Street, which accommodated the local market and a lock-up for pretty prisoners, was completed in 1832. A horse-drawn fire engine was installed on the ground floor at the north end of the town house in March 1861. A statue, which commemorated the life of Field Marshal James Keith, who had been killed in the service of Frederick the Great of Prussia at the Battle of Hochkirch on 14 October 1758 during the Third Silesian War, was unveiled outside the town house on 23 August 1868: it was a gift to the town from King William I of Prussia. A two-storey pedimented porch, which was designed and built by William Stuart with the intention of enclosing the external staircase, was added to the front of the building in 1881, replacing the original steps. Its arcade was also filled in.