When motivated, its coin production is doubled; also, one good of each type of the building's age, 3 forge points and a certain amount of medals are additionally produced. The production of coins is boosted by enthusiastic population and certain great buildings.
From Modern Era onwards, the building produces one refined good of each type.
The building can be plundered if it isn't motivated.
Black Tower is the first building that triggers secret animations. When you collect from it, and if you have animations active at that time, you will see a lot of bats flying out of the belfry! These bats will then spread over your city and leave during the next 15 minutes.