In the Aztec Cultural Settlement, Aztec expansions can be purchased with cultural goods or Diamonds. You can select what cultural good you would like to pay for any expansion and only one of the goods is needed per expansion. In the Feudal Japan Cultural Settlement, Japanese expansions can be purchased with cultural goods or Diamonds. In the Viking Cultural Settlement, viking expansions can be purchased with cultural goods or Diamonds. Currently, there are 40 medal expansions. Medals expansions are not related by ages.

There is 3 categories of expansion: Reward Expansion (those you can win in the tech tree, the campaign map and castle system), Premium Expansion (those you can buy with diamonds), and Victory Expansion (those you can buy with medals). You can see below a table with all expansion type by age. Smaller, more efficient buildings will help to save space! But expanding or tearing down is not your only option to accommodate more buildings in your city – compare buildings with regards to size and effects. You may also unlock expansions by leveling up your Castle System (levels 16, 18 and 20). Additional expansions are available to you for Diamonds or medals. You can find them in your building menu – pay the costs and place them adjacent to your city. Investigate technologies for this purpose or conquer provinces on the continent map to give you the expansions. But you do not need to constantly sell buildings – you can also increase the size of your city.

Strictly speaking, your building site is also a resource in the city – you'll notice quickly that the available space is limited.

Forge of empires virtual future layout