 Being based in what would become East Berlin, Concordia was ousted from the Amateurliga Berlin to play in the DDR-Liga (II) as SG Concordia Wilhelmsruh.They were immediately relegated to the Landesliga Berlin (III) after only a single season and a last place finish.The club then played third tier football until the mid-1950s when it slipped deeper into the amateur ranks, making only occasional and fleeting appearances in the Bezirksliga Berlin through the 1970s and 1980s.