[1] He was the architect of the Opernpassage in Vienna, a pedestrian underpass of the most busy crossroads of the city near the opera house.

It was built in 1955 and opened on 4 November 1955, one day before the reopening of the Vienna State Opera after World War II.

Cooperating with the Federal Office for the Protection of Monuments in Austria the City of Vienna undertook a complete restoration of the structure, which was reopened on 17 September 2013.

[2] After the completion of the Opernpassage Hoch was asked to design three other pedestrian passages below ground crossing the Vienna Ring Road.

The Bellariapassage now connects to the Vienna U-Bahn, the other two lost their function and are used as party locations since the turn of the millennium.