In 1961, after the construction of the Berlin Wall, East Berlin came to be recognised in GDR administration as a 15th district, though it retained a special status until the adoption of the 1968 Constitution formally designated it as Bezirk Berlin.
East Berlin's status changed in 1961 when the Berlin Wall was built; it became part of the GDR's administrative structure as the 15th district. However, this designation was later formalized in the 1968 constitution, which officially made it Bezirk Berlin.