It was made up of collaborators of El Lissitzky such as Mart Stam and Hannes Meyer, whose greatest work was the glassy expanse of the Van Nelle Factory in Rotterdam. The clean lines of the New Objectivity were also being used for schools and public buildings, by May in Frankfurt, in Hannes Meyer's ADGB Trade Union School in Bernau and Max Taut's Alexander von Humboldt School in Berlin, as well as police administration and office buildings in Berlin under Martin Wagner. Cinemas, which would be very influential on Streamline Moderne picture palaces, were designed by Erich Mendelsohn (Kino-Universum, now Schaubühne am Lehniner Platz, Berlin, 1926) and Hans Poelzig (Kino Babylon, Rosa-Luxemburg-Strasse, Berlin, 1927–28) A composite style that used the new forms with more traditional masonry building was developed by Poelzig with his Haus des Rundfunks in Berlin and IG Farben Building in Frankfurt, and by Emil Fahrenkamp in his undulating Berlin Shell-Haus. Meanwhile, Erich Mendelsohn's architecture had developed into a 'dynamic functionalism' for commerce, seen in his curvaceous department stores such as the Columbus-Haus in Berlin (demolished in the 1950s) and in the Schocken Department Stores, in Stuttgart (demolished in the 1960s) Chemnitz and Wrocław. In Munich Robert Vorhoelzer and Robert Poeverlein founded the "Bayerische Postbauschule" and built many modernist post offices while the architectural mainstream of 1920s and 1930s Munich still preferred the nostalgic "Heimatstil". The Great Depression, beginning in 1929, had a disastrous effect on the New Building, because of Germany's financial dependence on the USA. Many estates and projects planned in Frankfurt and Berlin were postponed indefinitely, while the architectural profession became politically polarised, something symbolised by the sacking in 1930 of the Marxist Bauhaus director Hannes Meyer—who had stressed, with his collaborators Ludwig Hilberseimer and Mart Stam, the importance of working class and collective housing—to be replaced by Mies van der Rohe, whose Barcelona Pavilion and Tugendhat House had gained him a reputation as a purveyor of luxury to the rich, and proceeded to turn the Bauhaus into a private school.