Advanced Industrial plots can be upgraded according to the Tech Tree. So an Iron Mine can turn into a Steel Mill or some sort of Nuclear Facility i believe. Each advanced industrial plot gathers resources in it's stockpile (which you can check when you click "access stockpile" on the ASAM menu). When there's enough resources in there, you can upgrade it.Ok thanks. But what about plot upgrades? If I select the plaque the only upgrade option I get is to prevent auto upgrades.
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That said, you need to do certain things to unlock each upgrade possibility. Check this thread (especally the spreadsheet) to see what some of the possible upgrades are. Keep in mind, this could be considered spoilers for the mod: https://simsettlements.com/site/ind...-revolution-tech-tree-discovery-spoilers.949/