Players’ structures (or those build during curses) come in two different levels and can thus be upgraded. They start on level one, until all their neccessary prerequisites are met; particularly its power supply and a connection to the road network of its settlement. Then the structure can be leveled up.

Structures on level two offer more advantages: they are toughened against attacks of cursed adversaries and provide new and valuable quests. For instance, as soon as a settlement’s cityhall is upgraded to level two, the settlement counts as a city.
By the way, the above image depicts a generator. Each settlement in Coobico will need several of those, depending on the number of buildings it is made of. Of course, generators can be upgraded as well…
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