The building comes with the special set bonus. It produces happiness when not connected to any other buildings of the set, and additional coin boost and supply boost when connected to other Classical Garden Set buildings.
For more information see the Set Bonuses.
The Classical Garden Statues come with the special set bonus. When it is adjacent to other buildings belonging to the Classical Garden Set the properties of the building are improved.
The Classical Garden Statues will provide the following boosts. Base happiness will always be produced. Bonus stats are determined by how many other unique Classical Garden Set buildings it is connected to.