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In the 1920s, when Gilded Age plutocrats reigned in Manhattan, an heiress agreed to an unheard-of deal. She traded her Fifth Avenue mansion for an apartment atop a new building.

But she had her demands. A private entrance with its own driveway. And a private elevator.

She got them, along with a 54-room apartment, including a dining room that could seat 125 and a cold storage room for her furs and flowers . An architectural historian described it as “the largest and very possibly the most luxurious apartment ever created anywhere.”

So was born a Manhattan penthouse.

Now, in another time of extreme wealth in New York, superluxury buildings are rising higher than ever, with prices to match.

With such an abundance of opulence how do you attract buyers?

Promise a trip to space.

Yes, two seats on a future spaceflight.