The City Hall is a historical building in Cologne, western Germany. It is located off Hohe Straße in the district of Innenstadt, and set between the two squares of Rathausplatz and Alter Markt. It houses part of the city government, including the city council and offices of the Lord Mayor. It is Germany's oldest city hall with a documented history spanning some 900 years. The history of its council during the 11th century is a prominent example for self-gained municipal autonomy of Medieval cities.
Today's building complex consists of several structures, added successively in varying architectural styles: they include the 14th century historic town hall, the 15th century Gothic style tower, the 16th century Renaissance style loggia and cloister, and the 20th century Modern Movement atrium. The so-called Spanischer Bau is an extension on Rathausplatz but not directly connected with the main building.