Python for grasshopper - creating density zones and building heights

Hi all,

Trying to create density zones with buildings heights higher in the centre (40 to 60m) and lower (20 to 39m) as you go out using Python in Grasshopper. I have managed to set the two origin points and distance rules to filter the areas. (eg. distance from p^n < r^1 = inside that zone p^n > r^1 < r^2 = inside that zone where p means point and r means radius). If anyone can share some python knowledge on what my next steps should be, please do get in touch! Screenshot of my script is attached!