Prerequisites: Main Building Level 1
The resources wood, clay and iron are stored in your warehouse. By increasing its level you increase your warehouse’s capacity.
After building one warehouse level 20, additional warehouses can be built.
The level dependent attributes (such as construction costs, generated culture points and capacity) can be found here.
For the full table of construction times click this link for server with 1x speed and this link for server with 3x speed.