Considering the timing, my money is on "no one."
I think the gilded age comparison is unfair. The George Vanderbilt's house is a tourist trap and hotel now. I can't imagine this thing being that useful in a hundred years.
they thought about making that very point, then backed off a little. Let's be honest: 100,000 square feet in the Hollywood Hills is going to be the ramshackle citadel of a Baja warlord in a hundred years.But while Gilded Age mansions were built as family legacies to be passed down to future generations or endowed to universities, these tech-centric, ultramodern glass-and-marble behemoths are designed for living in the moment. They come furnished, often with artwork, wine and cars. Each represents a developer’s bet that an instant-gratification billionaire is willing to pay more for it than almost anyone else has ever paid for a personal residence before.