From the listing (which was held by Cathy Franklin, Alexis Bodenheimer, and Marion Smith of Corcoran, in case you were wondering):
Perfectly situated on the 7th Floor of 10 Gracie Square, this one of a kind prewar corner residence boasts some of the most spectacular views of the East River along with soaring 11 foot ceilings, original herringbone floors, three wood-burning fireplaces and an abundance of classical architectural details. There are five oversized bedrooms, two staff bedrooms, five full bathrooms and a powder room.
A private elevator landing leads to an elegant entrance gallery with a walk-in coat closet and a windowed renovated powder room.
This entrance gallery looks larger than many a Manhattan studio:
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That staircase is epic. A duplex in Manhattan is already a rarity, and few of them have anything other than a dinky spiral staircase.
And few Manhattan apartments have wood-burning fireplaces:

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That’s just one of several fireplaces; keep an eye out for the rest of them during this tour.
Come join me by the window — actually, windows (six oversized ones, no less) — and check out the amazing views:

The apartment is only on the seventh floor, but given the lack of obstructions, the vistas are splendid.
You can take in the East River from several other rooms, too….