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The Grand Bridge produces coins in 24 hours, provides happiness and when it is motivated, its coins production is doubled and all special productions are enabled. It also gains additional boosts after being upgraded.
The Grand Bridge can be upgraded with a Grand Bridge Upgrade item. To upgrade your Grand Bridge, use the Grand Bridge Upgrade item on the Grand that is already situated in your city. Its upgraded version will then be placed in your inventory, and the original Grand Bridge will disappear from your city (note that the upgraded building will be from your current era, even if the old one was from one of the earlier ages).
Other Special Buildings