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German federal city state

Since the German reunification on 3 October 1990, Berlin has been one of the three city- states of Germany among the present 16 federal states of Germany. The Abgeordnetenhaus von Berlin (House of Representatives) functions as the city and state parliament, which has 141 seats. Berlin's executive body is the Senate of Berlin (Senat von Berlin). The Senate consists of the Governing Mayor of Berlin (Regierender Bürgermeister), and up to ten senators holding ministerial positions, two of them holding the title of "Mayor" (Bürgermeister) as deputy to the Governing Mayor.

The total annual budget of Berlin in 2015 exceeded €24.5 ($30.0) billion including a budget surplus of €205 ($240) million. The German Federal city state of Berlin owns extensive assets, including administrative and government buildings, real estate companies, as well as stakes in the Olympic Stadium, swimming pools, housing companies, and numerous public enterprises and subsidiary companies. The federal state of Berlin runs a real estate portal to advertise commercial spaces or land suitable for redevelopment.

The Social Democratic Party (SPD) and The Left (Die Linke) took control of the city government after the 2001 state election and won another term in the 2006 state election. From the 2016 state election until the 2023 state election, there was a coalition between the Social Democratic Party, the Greens and the Left Party. Since April 2023, the government has been formed by a coalition between the Christian Democrats and the Social Democrats.

The Governing Mayor is simultaneously Lord Mayor of the City of Berlin (Oberbürgermeister der Stadt) and Minister President of the State of Berlin (Ministerpräsident des Bundeslandes). The office of the Governing Mayor is in the Rotes Rathaus (Red City Hall). Since 2023, this office has been held by Kai Wegner of the Christian Democrats. He is the first conservative mayor in Berlin in more than two decades.