Buildings - Skymods - Stellaris Mods Catalogue
With patch 3.0, building slots are locked, and you will not be able to unlock them unless you meet certain requirements.
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Downloads - More Building Slots mod for Crusader Kings III - ModDB
Read more about More Building Slots (Unlocked) at Campaign, Mod on Skymods. ... Wood Elves Settlements – 14 Slots (you should be able to build every building).