Hello Christine,
Yes you can buy property here in congo, local people even like when foreigners do that. because they think foreigners are more reliable than the country men and also think that they have a lot of money to spend.
so before buying a property, you should contact trustworthy local person who will discuss directly with the owner. if the owner notice that you are a foreigner white or black, the price can be doubled or increased. this is Congolese mentality.
and also, the property you want to buy, you have to first check if there is no law problems with the place, and that the owner has notarised document to show that he is the real owner.
I hope this will help you
Ruth