The Mendelsohn House () is a former Jewish Tahara house (Bet Tahara) in Olsztyn (Allenstein), Poland, today used as a center for intercultural dialogue. It also includes a gatehouse. Tahara House The Tahara house, completed in 1913, was the first building designed by Erich Mendelsohn and the only one in his hometown of Allenstein. The Bet Tahara was built from 1911 to 1912 as a component of the Jewish cemetery of Olsztyn that was already existing since 1818. Mendelsohn create this project during his studies at the Munich Technical University, and had the chance to realize it. A smaller gatehouse, the residence of the cemetery's gardener, is part of the complex. The passage between both buildings was used as the main entrance of the cemetery. The structure was influenced by Joseph Maria Olbrich's architecture. The circumstances of Mendelsohn's commissioning remain unclear. The commissioning was probably influenced by Mendelsohn's father, a venerable member of the Jewish community of Allenstein. The house was equipped with rooms for the ritual washing of the corpses, a mourning hall and a mortuary leading to the adjacent Jewish cemetery. The interior is dominated by the central hall, a pyramidal wooden dome with mosaic decoration. A frieze with Hebrew lettering decorates the room. The design is only partially characterized by Jewish symbolism, simplified geometric elements show the influence of Art Nouveau and expressionism. With the rise of Adolf Hitler in Germany, the cemetery was defiled by the Nazis in early 1936 but was not directly affected by the Kristallnacht riots of 1938. In 1943 the state of construction of the building was described as good, the gatehouse was still inhabited. In 1939 Allenstein's Jewish community counted 138 members (448 in 1933) In summer 1942 the Germans deported the Jews of Allenstein to the Minsk Ghetto and Theresienstadt and murdered them in the Holocaust. The Jewish community of Allenstein ceased to exist. Municipal archive After World War II the region became part of Poland. The use of the building during the immediate post war years is unknown. After an anti-semitic campaign in Poland the remains of the cemetery were levelled to the ground in 1968 and the building was used as a magazine by the municipal archive of Olsztyn until 1996. Construction drawings of 1971 show several significant changes like the installation of a staircase between the main floor and the basement. This alteration resulted in the loss