[3] After the Anschluss of Austria to Nazi Germany in March 1938, the hotel was confiscated from its Jewish owners by the Gestapo who made it their headquarters.

In 1951 a memorial stone was erected by concentration camp survivors, which was then replaced in 1985 with a bigger monument financed by the city of Vienna.

The monument consists of granite blocks from the quarry of the former concentration camp at Mauthausen and a bronze statue symbolising a survivor.

The inscription comes from the president of the association of the survivors of the concentration camps Wilhelm Steiner and reads: (German) "Hier stand das Haus der Gestapo.

Österreich aber ist wiederauferstanden und mit ihm unsere Toten, die unsterblichen Opfer."

[6] On 13 June 2015, as part of the theatre festival Wiener Festwochen, a group of artists (Zsuzsi Flohr, Benjy Fox-Rosen, Eduard Freudmann, Eva Reinold, Luisa Ziaja) illegally erected a meta-memorial dedicated to the survivors who had illegally erected a monument on that spot in 1951.