With property rates in hand, Movoto next determined the size of the castle. The average double-doored entrance like Peach has is 72 inches wide. Using the door as a ruler, they determined that Peach's pad is a sprawling 453,060 square feet, and probably has at least one stray Toad entombed within its walls for good luck. That makes Peach's castle about the size of Hogwarts, although it's unclear whether they counted just the grounds or also included the battlefields, docks, and giant clocks Peach's magical paintings hide.
Making the reasonable assumption that castles are expensive, Movoto looked at the most extravagant houses in Oslo and found an average square foot price of $2,099. That seems a bit much for a neighborhood overrun with killer plants, angry sentient bullets, and endless pools of lava, but we suppose gentrification has to start somewhere.
Put all of that together, and you end up with a value of $950,972,940. And that's just the castle itself -- the figure doesn't include the land it sits on, its dozens of golf courses and tennis courts, or the elaborate lava level in the basement. Then again, maybe the economy works differently in a world where you can punch bricks into gold.