 These projects were largely on the city's North Shore, and to a lesser extent in the Eastern Suburbs.Following on from Walter Burley Griffin's work in the Sydney suburb of Castlecrag, this style of Australian architecture was visually sensitive to the environment and, like Griffin, often utilised natural local materials as structural elements.In the central business district, the lifting of height restrictions heralded the beginning of the city's change into a largely high-rise city.