Johanna Holländer died sometime before 29 January 1969. On this day the Castle Mill was entered in the Heidesheim register as belonging to her heirs: half went to each of the State League of Jewish Communities in Hesse ("Landesverband der Jüdischen Gemeinde in Hessen") and Irgim Olèg Merkaz Europa in Tel Aviv. They could do little with the property and were glad when on 11 March 1970 it was sold off to Heidesheim building entrepreneur Theodor Kiese. Only a fortnight later, he passed it on to the Ingelheim pharmaceutical firm C. H. Boehringer Sohn.