In October 1908, the Haus des Lehrers (house of teachers) was opened next to the Bunte Brettl at Alexanderstraße 41. It was designed by Hans Toebelmann and Henry Gross. The building belonged to the Berliner Lehrererverein (teachers’ association), who rented space on the ground floor of the building out to a pastry shop and restaurant to raise funds for the association. The building housed the teachers' library which survived two world wars, and today is integrated into the library for educational historical research. The rear of the property contained the association's administrative building, a hotel for members and an exhibition hall. Notable events that took place in the hall include the funeral services for Karl Liebknecht and Rosa Luxemburg on February 2, 1919, and, on December 4, 1920, the Vereinigungsparteitag (Unification Party Congress) of the Communist Party and the USPD.