Adelaide is the capital city of South Australia and is known for its lower-rise cityscape. This is a result of the city's planning regulations that limit building height. The idea of no high rises was introduced in the 1970s to preserve the city's historic character, as well as to maintain the open sky views and parks. The regulations also have had the effect of restricting growth and encouraging urban sprawl. The city has also had difficulty keeping up with population growth, leading to a housing shortage. Despite these issues, the regulations remain in place due to the city's commitment to preserving its unique character.