The church is incorporated in the "Deutschordenshaus", the seat of the Order. Next to the cobbled inner courtyard is the "Schatzkammer" (the Treasure Room), a real ecclesiastical treasure trove that has been turned into a museum, consisting of five rooms on the second floor. The different collections have been built by successive Grand Masters during eight centuries. They constitute one of the oldest treasure collections in Vienna, covering the Gothic, Renaissance, and Baroque periods. The real start of the "Schatzkammer" can be dated to 1525 when the Grand Master Albert of Prussia converted to Lutheranism and declared the collections his private property. The museum was reopened on 22 April 2006 after an extensive renovation.