Once this is done, a single additional level will be unlocked. At level 10, the Great Building will no longer be able to advance until a full set of blueprints are 'spent' to unlock the next level. For each level gained, the inherent bonus of that Great Building increases, as well as the rewards paid to the top 5 donors. To level your Great Building, you need to contribute a specific amount of Forge Points to the building. Once the Great Building's requirements have been met and the foundation laid, it will be at level 0 and must be 'leveled' to level 1 before granting benefits to the player. Great Buildings require 9 blueprints to construct. Unlike conventional buildings which require only coins / supplies, Great Buildings have requirements of goods and a full set of blueprints which must be collected before the Great Building can be constructed.

Each Age offers two Great Buildings (with No Age, Early Middle Ages, Arctic Future and Oceanic Future having three Great Buildings each and Space Age Asteroid Belt, Space Age Venus and Space Age Jupiter Moon having one Great Building), each one with its own unique bonus, graphic and space required to build. Great Buildings are special buildings inspired by world history which can be built to provide powerful benefits to the player.

Forge of empires buying arc goods