 The IG Farben Building was developed on land known as the <unk> in Frankfurt 's Westend District . In 1837 , the property belonged to the Rothschild family . In 1864 , the city 's psychiatric hospital known as " <unk> " or " <unk> " ' , was erected on the site . The name <unk> derives from an ancient Christian memorial that once stood here on the road outside Frankfurt . It was known as the " <unk> " as in Ave Maria but in the local Frankfurt dialect it was called the " <unk> Stein " . Here , Dr Heinrich Hoffman hired Alois Alzheimer to work in the hospital , where they both explored progressive methods of treating the mentally ill . The <unk> was established in 1880 on the larger western part of the site . 
