The International Mozart Foundation’s home houses the 800 seat large concert hall, where most of the Foundation’s concerts take place, and the smaller Viennese hall, which is used for chamber concerts. Both performance spaces are also used during the Salzburg Festival. On the first floor is the Art Nouveau style Bibliotheca Mozartiana of the International Mozarteum Foundation, administrative offices and a display of facsimiles of Mozart’s letter. Outside is the Bastion Garden with a view over the Mirabell Gardens.