Vampire Aristocrat Castle vs. Modern Billionaire Penthouse

I was daydreaming about the differences between a vampire aristocrat’s castle and a modern billionaire’s penthouse. One feels ancient and mysterious, with stone walls, hidden passages, and maybe a crypt or two, while the other is all sleek glass, smart tech, and city views. What do you think sets them apart in terms of atmosphere and purpose? I’m curious how each reflects their owner’s lifestyle and values.