Australians enjoy to middle-class suburban lifestyles in their homes. Apartments—called flats—were not common until recent years. They became more prevalent because of reduced family sizes, the adoption of more cosmopolitan modes of living, a trend toward rented accommodation, and state government efforts to revitalize the inner cities and maximize expensive infrastructural investments in transportation, water supplies, and other services. These developments were accompanied to some extent by an increased sophistication, particularly in the capital cities.