The Cityhall in Leiden was build in 1600 by Lieven de Key. The later part at the Vismarkt was developed in 1932 by C.J. Blauw after the big fire in 1929. The Koornbridge is a bridge between the Vismarkt and the Oude Rijn. The bridge dates back to 1642 and takes its name from the fact that corn was traded. In the 19th century a roof was placed to protect the mechandise. In march 2007 this roof was renovated