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.
Sydney Tower
Designed by Australian architect Donald Crone, the first plans for Sydney Tower were unveiled in March 1968. Construction of the office building commenced in 1970, and tower construction began in 1975. Prior to construction of the tower, the height limit in Sydney had been set at , to allow for the harbour’s flying boats that were popular before the modern jet era.