Aus der Art geschlagen: Eine politische Biografie von Felix Weil (1898–1975)

Gruber distinguishes Felix Weil’s maternal inheritance, used for the building, from Hermann Weil’s operating and staff support. He reports the 1924 maintenance agreement and differentiates Horkheimer’s July 1930 chair, October management agreement, and sole directorship in February 1932. These are secondary findings; the underlying agreements have not been independently inspected.