Melbourne’s open space system spans property boundaries over public and private lands, and provides key social and ecological services. With significant population growth predicted over the next 50 years, high levels of infill housing will be required. Increasing house sizes and infill development practices are directly modifying the quantity and quality of private open space in inner and middle belt suburbs. The distribution of public open space in Melbourne is uneven, with most inner municipalities, and 6 of 13 middle municipalities, having a shortage of public open space per capita.