Enchanting a Building is a Free Action that you can do during your turn if you have an Enchantment token in your player area which is not already on a Building card.

To do so, place the Enchantment token on the enchantment slot of a Building Card (on the bottom left corner).

Each Building can only be enchanted once, and Enchantment tokens can never be removed once placed.

There are two types of Enchantment effects, indicated by the icon on the Building card:

Immediately resolve the one-time Enchanting effect.

Apply the Enchantment effect as a modifier to the normal effect of the Building.