In the north the locality includes the neighborhoods of BÃ 1\/4 rknersfelde and Ahrensfelde , an overbuilt strip of land which once belonged to the Brandenburg municipality of Ahrensfelde and was incorporated into Berlin in 1990 . In the north the Marzahn locality includes the neighborhoods of BÃ 1\/4 rknersfelde and Ahrensfelde , an overbuilt strip of land which once had belonged to the Brandenburg municipality of Ahrensfelde and was incorporated into Berlin in 1990 .