A visual breakdown of which facilities have prerequisites and what those prerequisites are can be found in the Build Tree.

Note on Field costs: One of the things you will notice while leveling up the Grain Field, Iron Mine, Lumber Mill, and Ironworks is that you typically do not need as many resources in the specific facility you are trying to build. In other words, if you are building an Iron Mine, you will need less iron. Food always appears to be on a different scale. Often two of the other three are the same with the lower one being the resource you are trying to build.

NOTE: Data that is still needed is marked in red.

Natural Facilities

Resource Production Facilities

Military Facilities

Research Labs

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