Zwei-plus-Vier-Vertrag
The council had held its final meeting on 2 October 1990, on the eve of the reunification of Germany, when it promulgated the formal documents – already agreed in advance – that authorised the inclusion of the city of Berlin in the German reunification. This was necessary because, until then, West Berlin was legally not a part of the Federal Republic of Germany, although it was administered by it. But with the allied Souveränitätserklärung (Sovereignty Declaration) agreed in the council, the Federal Republic was allowed to assume legal control of Berlin at the moment of German reunification (although the withdrawal of the Allied military presence had to wait until 1994, in accordance with the timeframe provided by the Treaty on the Final Settlement with Respect to Germany).