The pressure to concentrate high density flats in low desity areas becomes too much. The land owners in these areas pressure city hall to increase density so they can sell/develop their land with higher profit. At the same time, residents who want to live in the leafy areas as they are also give an opposition. The stronger group wins. In Karen, Runda, Muthaiga, residents associations are mostly for status quo. 10years down the line, things will be different.
Kileleshwa has been recently re-zoned again to allow for even higher buildings-more than 5 floors.
Its a pull-push situation between residents wanting higher density and others wanting status quo.
As Iron Sharpens Iron, So one Man Sharpens Another.