The place is indeed Tsingtao; the picture below had been taken during the same muster. In the back you can see the entrance to the old "Artillerielager" and behind the gate to the left you can see the Bismarck-Kaserne in the far distance. As the first buildings of Bismarck barracks were erected in 1903 this picture must have been later and not in 1900 or even earlier. The second officer to the left in your picture looks like Meyer-Waldeck, the last German governor of Tsingtao, as off 1911. So this picture might have been taken much later.
Best regards
Timm