Stoschek first began buying art in 2003. Her collection features works by mainly European and US artists working from the 1960s onwards and includes video, multi-media environments, internet-based installations and performance. The Julia Stoschek Collection in a former industrial building in Düsseldorf-Oberkassel opened in 2007, and has two floors of exhibition space, over 2,500 square metres (27,000 square feet). Since the opening, she has mounted regular collection-based shows, including solo exhibitions on Cyprien Gaillard and Bruce Nauman.