Structures

Estates
Estates increases how much resources you can steal from others. It has a level from 1 to 7.

Vaults
Vaults store resources that your workers produced from workspaces (Groves,Mines,etc...) Upgrading it will increase it's maximum capacity. Note that foreign island owners can steal from your vault. Vaults have a level of 1 to 6. You can buy the "Infinite Vault Gamepass" for infinite space for your vault.

Worker Houses
Worker houses are structures that can accommodate your workers and can add up to 2 workers maximum. Upgrading them will increase the assigned worker's speed at working. (Chopping, Mining,etc..) They have a level of 1 to 7.

Trade Market
Trade Markets are special structures that don't need an assigned worker; Instead are places you can trade resources with. For example, you can trade 10 Obsidian ores for 3 diamonds. Watch out, some trades are unbalanced. Trade slots can reset after a period of time. They have a level of 1 to 3.

Toolsmiths
Toolsmiths are shops that you can buy tools from such as Axes and Pickaxes. They have a level of 1 to 5.

Weaponsmiths
Weaponsmiths are shops that you can buy weapons from such as The Giant Blade and The ViletThorns. They have a max level of 1 to 5.

Gold Market
Gold Markets are very special structures that require the gamepass "Trader Kit" in order to be built. Unlike it's default counterpart "Trade Market" Golden Markets have more valuable trades and has a large amount of trading slots. They have a level of 1 to 3

Mine, Mineshaft, Super Mine
Mines are structures that are used to acquire minerals that are only used by workers. The only special feature it has that it is the fastest mine, faster than Mineshaft and Super Mine. Mineshafts on the other hand, can work with expeditions, meaning you can expedite whatever ore you workers will generate. For example, if you choose Obsidian to be expedited, workers that are assigned to the mineshaft will only acquire Obsidian at a cost of resources, and have 4 to 6 minutes depending on the mineral and have a cooldown that can be skipped by paying Crystals.. Super Mines generate rare ores but are extremely slow.

The Mine has a level of 1 to 6.

The Mineshaft has a level of 1 to 4.

The Super Mine has a level of 1 to 6.

Groves
Groves are used to acquire wood. They have a level of 1 to 5.

Farms
Farms are workplaces that are used to acquire food. Only workers can obtain food from it. They have a level of 1 to 6.