Talk:Buildings/@comment-2.227.11.29-20111022175430/@comment-67.166.108.173-20111026065949

You only need three warehouses upgraded to the max level. The fourth one can stay at level 9. That equals a total of over 23million. That's enough to upgrade your Outpost to level 5. It's also a good idea to upgrade all four to the max level. You'll have extra resources to play around with.

Also, just remember that, 10% of your resources are in each of your warehouses. 20% is in your Outpost.