Built in 1912/1913 by the Wiener Konzerthausgesellschaft according to plans by Ferdinand Fellner and Hermann Helmer in a modernized Empire style (laying of the keystone and opening on October 19, 1913). Structural damage to the wing of today's university and the Academy Theater was repaired by Fellner in 1914-1916, followed by Max Fabiani. The facade sculptures are by Ernst Hegenbarth, the imperial homage relief on the landing of the main staircase by Edmund Hellmer. The Thonet company provided the seating and the Backhausen company provided the carpets. The concert hall has three adjacent halls: Large Hall (renovation in 1974; originally for 2,030, today for 1,840 people), Middle Hall (Mozart Hall, renovation [restoration of the original condition] 1975; originally for 893, today for 706 people), Small Hall ( Schubert Hall, renovated in 1972; originally 414, today for 336 people). In 1927, on the occasion of the Beethoven centenary celebrations, the original model of the Viennese Beethoven monument (by Caspar Zumbusch) was set up in the foyer. On April 4, 1934, the actress Hansi Niese collapsed in the foyer of the Konzerthaus and died while being transported to the Loew Sanatorium. The "Kleines Theater der Josefstadt" is housed in the Konzerthaus. The Akademietheater, originally built as a school and practice stage for the Akademie für Musik, was used by the Burgtheater from 1922 (initially only partially) (since 1979 the Federal Theater Association has the right to use it). The Konzerthaus serves music - and social events, but also accommodates large congresses and other events (balls, banquets, outfits).