Venetian Palace of Count collaterals was built in 1671 in Baroque style. Initially, the facade was topped by a triangular pediment, which was then demolished. Palace balcony was connected to the neighboring church "Nine angelic choirs", was provided the opportunity to pass.

Once upon a time this place was located the Jewish Garden. Ferdinand I bought this land for 26,000 guilders for the construction of the school. In 1560, the school administration was handed over to the Jesuits, who greatly expanded and renovated buildings.

In the early 17th century, the building was owned by Count Thurzo. Thurzo was a Protestant, and after the defeat in 1620 was a small selection of Protestants: leave or classify themselves as Catholic Church Therefore, in 1620, Thurzo house was confiscated by Emperor Ferdinand II and was presented to the Italian Count R. collaterals, who was a staunch Catholic.

In 1671 the building was reconstructed, there was a second floor. After the death of Count collaterals, the facade of the palace has been updated.

During the second week of October 1762 in the palace of the Count, the first public concert of six years by Wolfgang Amadeus Mozart in Vienna before an audience. The concert was sensational, Mozart spoke about the whole of Europe. On this occasion, in June 1956 on the facade of the palace was a memorial plaque.

In 2001 it was held the last overhaul, the building passed into the possession of the Bank Austria.

A few years ago, in the basement of the palace Collalto archaeologists have found the remains of two 15th-century buildings, and walls that were even older (probably 13th century). Absolute sensation was the opening round of the room, which was surrounded by a stone wall two meters thick. According to Frederick Dame, the curator of the state management of federal monuments strange tower building was the beginning of the 13th century. Experts believe that it is part of the palace built by Henry II.