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The Mills estate in Staatsburg is among the more serious examples of Gilded Age residential architecture still accessible to the public in New York State, and I say that as someone who has visited a meaningful number of them over the years and who applies that category somewhat critically. The Beaux-Arts mansion designed by McKim, Mead and White is calibrated correctly for what it was intended to accomplish: large enough to communicate the social position of the family, specific enough in its historical and architectural references to indicate education and discrimination rather than pure expenditure. Those are different things and they produce different buildings, and this building is the better kind.

Five stars on the merit of the grounds, the architecture, and what the estate as a whole communicates about the period and the class of people who built it. I visited in December 2018, which is the off-season version of the property and, in some ways, the most revealing version.

The formal garden in December is stripped of its summer program and shows you the underlying architecture of the space: the wall lines, the path organization, the relationships between the garden rooms, the axial descent from the mansion toward the river. That structural clarity is not available in the summer when the planting program fills every available volume with growth. The bones of a formal garden are the design, and December is when the bones are visible.

The river view from the lower grounds is exactly what the Hudson Valley estates of this period were positioning themselves to capture. The Hudson at the Staatsburg reach is wide, moving south with authority, with the Catskills on the far bank providing the backdrop that the landscape painters of the nineteenth century were documenting. The estate is positioned on the ridge above the river to take maximum advantage of that view, and from the lower garden terraces the relationship between the formal landscape and the natural geography reads clearly.

There is a Gilded Age criticism that gets applied to properties like this as if it were a disqualifying observation: that the wealth that built these estates was extracted from labor under conditions that were exploitative, and that celebrating the aesthetic achievement is morally complicated. That criticism is legitimate and I hold it alongside the recognition that the architectural and landscape achievement is genuine. Both things are true. The estate is worth visiting because of what it shows about American ambition and wealth at a specific moment, and the question of whether that moment was admirable is part of what you are supposed to think about when you are standing in the garden looking at the river.

December is underrated for this property. The visitor volume is minimal, the interpretation is available, and the architectural reading is clearest when the distractions of the summer season are absent. Worth the visit in any season, and worth planning around the winter if the crowds matter to you.