Question: How many theatres are there in the Opera House? Sydney Opera House, a major arts center , was built on the harbor of Sydney , Australia .It was designed by the Danish architect, John Utzon.The building was completed in 1973. Although called an opera house ,it contains a concert hall ,one theatre for opera and ballet ,and a smaller theatre for plays ,a recording hall and rehearsals rooms and cinemas. It is the home of the Sydney Symphony Orchestra , the Australian Ballet , and Australian Opera.