While the Wishing Well seems to be a building that comes with a character, it behaves very differently from other character-associated structures. In fact, the Wishing Well itself is much more like a decoration than a building.

When you add the Wishing Well to your Springfield, you get a 4% boost to your cash and XP collections (in the same way the Police Car, the Ambulance, and Burns Limo work). But it doesn’t give you a regular income in the same way that your buildings do. The added value, however, comes from the Leprechaun, who you can tap as many times as you like (with a few seconds in between) to collect extra cash and XP.

You can read all about the Wishing Well and lots of other information on the St. Patrick’s day event here.