Both Adnan Khashoggi and Alec Wildenstein were owners of Ol Pejeta ranch in Kenya at different times (Adnan sold it to Alec and his wife Jocelyn transformed it into a luxury camp in the 1990s got perhaps cat obsession there).

Adnan bought stuff in Kenya from another billionaire... Tiny Rowland owner of Lonrho and friend of Al-Fayed. I think Al Fayed bank rolled Adnan.

Ol Pejeta is still owned by an anonymous billionaire (Wildensteins sold it) who turned it into a conservancy owned/run by a trust.

Adnan also bought Mt. Kenya Safari Club and turned it into a billionaires nest (place where Jack made first ever tweet from Kenya about 2009)

Bill Gates bought an Island last month in Malindi close to the property of Flavio Briatore, an Italian Billionaire who lives in Kenya and bought Naomi Campbell's her home (now a resort) in Kenya.

Bill Gates though is not alone Richard Branson owns stuff in Kenya too and has a popular camp resort inside Maasai Mara. Coincidentally Bill Gates loves the Mara, he camped there for new years 31st December 1999 with his then young family.

Seems billionaires like to flock. Where there is one there is plenty of others even though it doesn't seem they even interact in anyway. In places like Kenya no less.

There are others but like to be more discreet.