One you are viewing a suburb you can click on the icons across the top of the data panel. The unit icon will display Unit Prices. This is a time-series chart showing data for the Statistical Area 3 (Sa3) for houses.
This measures actual sold prices at the Sa3 level. Generally speaking, prices at the Sa3 are normally distributed. This offers us the advantages of being able to calculate a median price that can be calculated with modest sample size and then not change dramatically as you process more sales – and also helps present a less volatile time-series trend line.