Expand city is different from most other upgrades, but it is still very important. As the number of buildings you have increases, you will need more room to expand.
Each Expand City upgrade is in fact more of an unlock feature, enabling you to access and build on new lands.
As eel as providing more land to build on, certain levels of expand city are required in order to upgrade your Castle.
As you will see from the table of building requirements, there is no build time either, just a gold cost.
The table below has the build cost for each new land.
Expand City Building Requirements
We will update with accurate figures as we can verify them. Please feel free to leave any details you have from Dawn of Titans by commenting below and we will update the data accordingly.