Vienna State Opera
The opera house was the first major building on the Vienna Ringstrasse commissioned by the Viennese "city expansion fund". Work commenced on the house in 1861 and was completed in 1869, following plans drawn up by architects August Sicard von Sicardsburg and Eduard van der Nüll. It was built in the Neo-Renaissance style by the renowned Czech architect and contractor Josef Hlávka.
Philadelphia Opera Company
In 1907 Oscar Hammerstein I hired architect William H. McElfatrick of the firm J.B. McElfatrick & Son to design a new opera house for the city of Philadelphia. The plans were approved and in 1908 the Philadelphia Opera House was built over the course of just a few months at 858 North Broad Street. The structure was built specifically for Hammerstein's latest artistic venture, his new opera company, the Philadelphia Opera Company (POC).