Buildings

The City is the players base of operations. Build a mighty City by constructing and upgrading structures, erecting statues, and researching new technologies. Each structure performs an important function in the City. You can build the following types of structure: Production, Special and Unique. Certain structures also have additional modules available to improve or unlock functions.

City Buildings
The City has a number of free slots where you can build structures, There are small and large slots in the City. All production structures, except for a Stardust Mill, are constructed on small slots, while large slots are suitable for all other structures. Just tap a free slot to see the list of available structures. The number of free slots in the city is limited, and a player won't be able to build the maximum of every building, choose wisely!
 * Players may use crystals to complete a construction immediately. 

You can also upgrade most structures in the City up to level 25. This enhances their characteristics and provides you with even more bonuses. Building and upgrading structures require time, resources, and may require other structures to be built or upgraded first. To increase the building and upgrading speed, research Civil Engineering in the University (Economy and Economy II sections). You can demolish production structures, Barracks, Workshop, and Hospital, which will get you back some of the resources you used to build them. Tap a structure, and then tap Demolish. You can also hold down on a building, allowing you to pick it up and move it to an empty slot.
 * You can add an extra builder to construct two buildings or improvements at the same time!
 * Complete the construction or upgrade for free if it ends in less than 5 minutes (or more with higher VIP level!) or use accelerators to finish the construction work more quickly.