Tomorrow, Doyle New York will auction the contents of Balderbrae, the neoclassical estate in Suffern, N.Y., that was for 25 years the country home of interior designer and architect David Easton.

In his 42-year career, Mr. Easton — who trained with Edward Wormley, Valerian Rybar, and Parish Hadley — became famous for adapting elements of 18th century English design to modern American life. “He can make antiques look like the most natural livable things,” the director of arts, culture, and design for Town and Country magazine, Sarah Medford, said.

In the auction, nearly 600 furnishings, paintings, and decorations that Mr. Easton collected for the estate — which he sold two years ago — will be on the block. But he admits it pains him to see his collection up for sale. “I could cry and jump for joy at the same time,” Mr. Easton, who divides his time between travel and a flatiron district loft, said

Balderbrae is one of the best examples of Mr. Easton’s design philosophy, according to a vice president for furniture and decorations at Doyle New York, Mary Cunningham. “Everything about the house is chic as well as phenomenally comfortable,” she said, pointing to a set of down-filled mahogany armchairs upholstered with fabric Mr. Easton designed for Lee Jofa, the fabric manufacturer that was founded in 1823.

Mr. Easton and his partner, artist James Steinmeyer, purchased Balderbrae in 1980, attracted by its proximity to the woodlands of Harriman State Park. The property, once owned by esteemed horticulturalist Louise Beebe, contained only an overgrown walled garden and a stone cottage. “We thought, ‘What a wonderful wreck of a place,'” Mr. Easton said.

They restored the cottage and gardens and built an Americanstyle country home, filling it with items from some of the world’s top antique dealers, including Geoffrey Bennison, Colefax & Fowler, and Gene Tyson. Mr. Easton developed a relationship with this “vanishing galaxy” of dealers, Ms. Cunningham said.

From Mr. Bennison, Mr. Easton purchased one of the auction’s most sought-after items, a pair of rare Victorian tilt-top tables, circa 1869. The tables, valued between $8,000 and $12,000, are inlaid with an ivory façade of the Ruthin Castle in Wales; the pair comes with a handwritten label from the cabinetmaker. From Mr. Tyson, Mr. Easton bought a pair of Spanish Baroque ebonized and silver gilt mirrors, with the original glass, estimated to be worth $15,000 to $25,000.

Originally from York, Pa., Mr. Easton studied in Europe on a Fountainbleau scholarship before opening his own New York design firm. With projects such as Albemarle, the 5,000-acre Virginia estate he designed for Patricia and John Kluge, he built a reputation for his take on Georgian classicism, which blended the formal elegance of English country homes with American flair and an emphasis on comfort.

Take-Home Taste

On the block at Doyle tomorrow are 600 items from interior designer David Easton’s home Balderbrae. A few highlights from the estate’s main living room are below.

1. Dutch baroque-style brass chandelier
Estimate: $3,000-$5,000

Mr. Easton’s Georgian-style interiors frequently incorporated items from Europe, such as this decorative chandelier with two tiers of scrolling branches that hold 16 candles.

2. Sunburst clock
Estimate: $1,200-$1,800

The sunburst motif has been an Easton signature since the early days of his firm. This item is part of Lot 396, which includes two 27-inch gilt and painted resin sunbursts; one fitted with a compass, the other with a clock. The motif is also found on an Italian Baroquestyle oak sunburst mirror, valued between $4,000 and $6,000.

3. Spanish baroque ebonized and silver gilt mirrors
Estimate: $15,000-$25,000

Mr. Easton purchased this rare set of 18th-century Spanish mirrors, with the original glass, from New York antique dealer Gene Tyson.

4. Dutch Delft-covered urn
Estimate: $2,500-$3,500

This unusually large 18th-century chinoiserie urn is one of many pieces of blue-and-white Delftware from Balderbrae. A wide variety of similar dishes, vases, and urns are up for sale with estimates between $200 and $2,500.

5. Provincial Louis XV-style walnut wing armchair.
Estimate: $2,500-$3,500

Winged armchairs like these were designed to keep the sitter warm in drafty houses. The pair in this lot was purchased from Colefax & Fowler in London.

6. Painted and parcel gilt plaster brackets
Estimates range between $200 and $1,800

Mr. Easton designed these brackets used here to complement the Delftware on display. The brackets come in a variety of colors and sizes.

7. Mahogany upholstered armchair
Estimate: $2,500-$3,500

Mr. Easton designed the fabric — which was then manufactured by Lee Jofa — used to upholster these down-filled, Victorian-style chairs.

8. Victorian tilt-top tables
Estimate: $8,000- $12,000

This pair of rare ivory and ebony tables, circa 1869, came from London’s Geoffrey Bennison. With inlaid ivory façades of the Ruthin Castle in Wales, the tables come with a hand-written label from W. Roberts Ports, the cabinetmaker.

9. Dutch colonial brass and walnut side table
Estimate: $5,000-$7,000

This unusual two-tiered rectangular table with a removable brass tray came from the shop of New York’s Gene Tyson.

10. Louis XVI-style gray painted armchair
Estimate: $4,000-$6,000

Lot 443 includes four armchairs upholstered in red leather, with padded armrests and a bow-shaped front seat.

11. Gilt-wood X-form stool
Estimate: $2,000-$3,000

Mr. Easton designed these 18-inch-high stools, then covered them with one of the fabrics he designed for Lee Jofa.

12. Italian painted portrait medallion
Estimate: $800-$1,200

A set of two medallions in faux marbre frames depict Roman emperors Nero and Titus.

13. “Afternoon Gossip Lew Chew” lithograph
Estimate: $800-$1,200

Balderbrae’s walls were decorated with an extensive collection of prints, needlepoint, and lithographs, like this one from P.S. Duval & Co.