Extension

Extensions include Quarters (also known as Districts) and Resource Extractors that extend the development of cities. Extensions can be built within territories connected to a settlement.

Quarters/Districts
Quarters/Districts provide yields, while exploiting adjacent terrain yields (,, , and ) and providing specialist slots. All the quarters will gain yields the moment you build it, and don't need any population to "work" them - Specialists are for providing extra yields.

Except for the city center, all the quarters will remove the natural terrain yields of the tile underneath, unless they exploit the said yields.

Except for outposts, city centers, hamlets, and a few Emblematic Quarters, quarters and districts must be built next to another extension - that is, they need to attach to existing quarters.

Quarters/Districts also benefit from adjacency bonuses and infrastructure.

Emblematic Quarters (known as EQ among the players) are unique to every culture, and can only be built by a single culture in a given Era, while generic quarters can be built in any city in any numbers.

Resource Extractors
Resource Extractors are built on top of luxury and strategic resources to collect copies of the resource.

Holy Sites
See Also: Holy Sites

Holy Sites are special Religious Districts that act as the main producer of . A lot of yields offered by tenets will be applied to Holy Sites as a district yield. Unlike other districts, the number of Holy Sites are decided by religious tenets.

Certain wonders also act as a Holy Site for bonuses and religious influence.

Emblematic Quarters
Emblematic Quarters (known as EQ among the players) are unique to every culture and can only be built by a single culture in a given Era.