How much does renting a office space cost in these cities?
Depends in the Area you want to Rent. There are popular markets where all Somalis do business. In Muqdisho Bakaraha is such market and is expensive to rent a good spot. Other markets are one clan dominated, so they are less expensive to rent a spot.
I don't know about Hargaysa. Markets dominated by single clan are not expensive no matter where they are located in Somalia. Interestingly, this extends to how well a city is doing too. The more Somalis reside and do business in a city, the better is does economically. Even the quality of neighborhoods reflect this in Muqdisho. The more mixed Somalis, the better the neighborhood.