If a structure is not currently identified on the property (ie, new silos that will be added in), then you can manually add it yourself.

To do so, you will find the ‘Add Structure” option just above the first structure list.

The new structure will appear at the end of the list (as it currently has no area listed).
Once you click on the new structure, hit 'Place Structure’.
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On the main map, click on where you would like to add the structure.
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Click Save once you are satisfied with the location (the structure will be identified by a red dot as shown on the left-hand side.