In 1905 an extension building of the Museum of Decorative Arts was erected adjacent to the Martin-Gropius-Bau on Prinz-Albrecht-Straße 8. From May 1933 this building served as the headquarters of the Gestapo created by the order of Hermann Göring, where many political prisoners were tortured and executed. In December 1934, it also housed the headquarters of the Concentration Camps Inspectorate, which oversaw all the concentration camps. It formed the nucleus of the complex of buildings including the neighbouring "Hotel Prinz Albrecht" on Prinz-Albrecht-Straße 9 and the "Prinz-Albrecht-Palais" itself, which was taken over by the Sicherheitsdienst under Reinhard Heydrich in 1934. In September 1939, it developed into a centre for the Reich Main Security Office which was created by Heinrich Himmler and placed under the command of Reinhard Heydrich for the whole of Germany and occupied Europe. Himmler himself operated out of the building from an office on the top floor, thus making #8 Prince Albrecht Street the default headquarters for the entire SS.