31.08.1990, East Berlin / GDR. Signing of the "Treaty on the Establishment of German Unity" (short form: Unification Treaty). The treaty established the legal basis for the accession of the GDR to the Federal Republic of Germany. Palais Unter den Linden (Kronprinzenpalais). (From left) Wolfgang Schaeuble, Federal Minister of the Interior and Guenther Krause, Parliamentary State Secretary at the Office of the Prime Minister of East Germany.