The tower was built of large, red monk bricks and ornamented with a reticular pattern of dark burned bricks. Between 1880-1885 the rampart area around Jarmers Tower was excavated and the moat leveled in connection with the Nordic Exhibition of 1888. Jarmers Tower was subsequently restored and preserved as a ruin. The plaza built around the excavation where becomes has been named Jarmers Plads.