Now in this picture, it's demonstrated how Kibera is shrinking day by day with new units of housing being added to replace the old slum buildings.
The cleared area in the centre of the picture was basically where old houses occupied(including the nice looking houses) and it's been cleared to pave way for construction of more housing units.
The slum upgrading program is on full gear.
Now it's not only housing units getting built but also schools, health centres (like the recently completed Kibera health centre at the bottom right of the picture if you zoom in. One with green roof) and basic resources like piped water, street lighting etc...