 One of Carlberg's adepts was Erik Palmstedt (1741–1803).Palmstedt was able implemented many of the renewal plans Carlberg have had for the medieval city, including the Stock Exchange Building and the small open space Tyska Brunnsplan, both still preserved.In 1744–53, the area around the Karl Johanslussen sluice was redesigned by an aged Christopher Polhem (1661–1751).