Took this picture from the rooftop of the KICC building. Pretty chill place to spend an afternoon. 28-30 floors high gives one a great overview of the city and some famous landmarks such as the Nairobi Railway Station, the Nairobi National park & the Parliament buildings.
Charges are KES 150 for residents and I think KES 400 for foreigners. The is an extra charge of KES 7,500 if you would like to take a DSLR up there as some local photographers almost turned the rooftop into a studio (bummer, my phone camera was enough). They allow one to bring snacks and other food stuffs except no alcohol.