You can contact us through the following phyisical address:

Cornerstone Africa Ltd
African Union Road
Opposite ALPHA PALACA Hotel
Remera-Gasabo District
Tel : +250 788302477
P.O.Box 1918, Kigali

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Contact Info
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Corner Stone Africa
Africa Union Road (Opposite Alpha Palace Hotel),
Kisementi Cell - Gasabo District
Phone: (250)788302477
P.O.Box: 1918 Kigali
We have moved Cornerstone Africa (COSTA) Head Office has moved from Solas Building to Africa Union Road (Opposite Alpha Palace Hotel), Remera Sector, Gasabo District.

According to its Managing Director, Mr. Joshua Mbaraga, COSTA move is meant to create more visibility for the company and also be strategically co-located with their Training Institute that will soon be commissioned on the same block..