Planning fallacy
The Sydney Opera House was expected to be completed in 1963. A scaled-down version opened in 1973, a decade later. The original cost was estimated at $7 million, but its delayed completion led to a cost of $102 million.
Wheeler Opera House
Denver architect Willoughby J. Edbrooke designed a building that combined a basic Romanesque Revival form with some Italianate decorative touches. It was built in ten months from June 1888 to April 1889 at a cost of $100,000 ($ in contemporary dollars). Aspen had been the first city west of the Divide to be wired for electricity, and the theater's chandelier took advantage of that with 36 separate lights.