Like @mukuba2002 said: get a lawyer and
don't trust anybody!!! Everybody will only behind your money: Mzungu (whites) = ATM, because we are printing the money in those machines
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Proof EVERYTHING (twice, trice)! Check some other Title deeds before, that you know how they look like!!
I know so much organizations, there are "in hot water" either by Founders /Staff-members or Locals.., that my meaning is: it is an risk
absolut and only!
YES an Foreigner can buy land as so far it isn't linked to agriculture in any way. On the Goverment-Websites you should be able to find the rules for setting up your organization.
And if you like to make it haraka (fast) take a lot of Kitu kidogo (Corruption-Money) too, you will need it
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PT_Kaloleni