Stadion An der Alten Försterei was built in 1920 as FC Olympia, the predecessor of Union, had to move out of their previous home, which had gotten repurposed for residential housing.

The stadium could initially hold just over 10,000 spectators, nearly all standing, and FC Olympia regularly moved to higher-capacity grounds for important matches.

In 2008, works started on replacing the terraces with new covered terraces along three sides. Just as during earlier redevelopments, a lot of the works were performed by fan volunteers. In 2012, works started in rebuilding the all-seater main stand, which opened one year later with a friendly against Celtic.