The sgmap.html map for strasbourg example plots the price per squere meter is color coded in the center of the circle, the total price is in de border.
Some inspiration from https://www.esri.com/about/newsroom/arcuser/house-hunting/
garciaguevara/geo_real_state
The price per squere meter is color coded plotted in the center of the circle, the total price is in de border.