Welcome to The Mark Penthouse, the largest penthouse suite in The United States. Spanning 10,000 square feet with an additional 2,000 square feet of terrace, this duplex suite truly is a castle in the sky. It offers absolute privacy and ultimate luxury with 5 bedrooms, 7 bathrooms, 4 fireplaces, and a living room under the landmarked copper roof with 26′ ceilings.

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