McDuck's is the first shop the player can open up in Castleton. It is a big mall full of goods fitting all categories, like tools, outfits, furniture, and more. There is also a resale shop on the top floor.
A rich building resembling a fancy hotel. It has many shades of golden accenting, and many royal red carpets. There are two sets of spiraling stairs that lead to the top floor. On the left is the clothing section, while the right has furniture and the back has some materials for item crafting.