For centuries, the North Shore of Long Island was a quiet expanse of rolling hills, dense woodlands, and sleepy farming communities overlooking the Long Island Sound. But as the nineteenth century gave way to the twentieth, a massive wave of industrial wealth swept out of New York City. The nation’s most powerful financiers, steel barons, and railroad tycoons looked eastward, seeking a scenic escape from the grime and congestion of Manhattan.

This migration marked the spectacular beginning of elite home construction on Long Island. Over the course of four decades, a stretch of land roughly forty miles long was transformed into the “Gold Coast”, an exclusive enclave featuring more than 1,200 palatial country estates. These were not mere vacation homes; they were architectural masterpieces designed to rival European royalty. Yet, the true charm of these legendary properties lies in the hands-on, often eccentric behaviors of their original owners during the construction process. Here is how three of Long Island’s most famous estates came to be, and the fascinating, obsessive roles their owners played in bringing them to life.

Oheka Castle

When investment banker Otto Hermann Kahn set out to build Oheka Castle in Cold Spring Harbor in 1914, he aimed to build the second-largest private residence in United States history, a massive 109,000-square-foot French-style chateau boasting 127 rooms.

But Kahn’s behavior during construction was driven by a deep, lingering anxiety: an absolute terror of fire.

After his previous country home in New Jersey burned to the ground, Kahn was determined never to watch his life’s work turn to ash again. He took unprecedented precautions during Oheka’s five-year construction process:

The Artificial Mountain: Kahn purchased a flat parcel of land but insisted his palace sit atop the highest point in the area. Before a single foundation stone was laid, he spent two entire years moving mounds of earth to construct a massive, artificial hill.

Concrete and Steel Construction: He ordered his architects to build the entire structure out of reinforced steel and solid concrete. To ensure fire could never spread, many of the interior walls were built up to two and a half feet thick.

Faux Wood Walls: Kahn absolutely banned real wood in the construction of the grand library. Instead, he hired specialized European plasterers to use a painting technique called faux bois (false wood). These artisans painstakingly painted the concrete and plaster walls to mimic the grain, texture, and warmth of fine English oak, achieving the aesthetic he wanted with zero flammable materials.

Old Westbury Gardens

While Otto Kahn was building a concrete fortress, steel heir John Shaffer “Jay” Phipps was busy designing a grand romantic gesture.

In 1903, Jay married Margarita “Dita” Grace, a British socialite. Dita was hesitant about moving across the Atlantic and leaving her beloved English countryside behind. To ease her transition and win her heart, Jay made a grand promise: he would build her an estate in America that perfectly recreated her family’s historic estate in Battle, England.

During the construction of Westbury House, which was completed in 1906, Jay was meticulously hands-on:

Direct Importing: Working closely with English designer George Crawley, Jay was obsessed with authenticity. He bypassed American suppliers and imported almost all the mansion’s furnishings, marble fireplaces, and ornate wood paneling straight from historic homes in England.

Designing for the Dogs: Knowing his wife’s deep passion for animals, Jay had the estate’s vast grounds designed specifically to accommodate her beloved dogs, creating sweeping lawns and formal English gardens where they could roam. Dita personally oversaw the planting of the gardens, ensuring the flora matched the exact colors and scents of her childhood home.

Eagle’s Nest

Down on the waterfront in Centerport, William K. Vanderbilt II (great-grandson of Cornelius Vanderbilt) began construction on his estate, Eagle’s Nest, in 1910. Unlike Kahn and Phipps, who carefully planned their massive estates from day one, Vanderbilt’s construction process was a decades-long, highly impulsive evolution.

The Bachelor’s Cottage: Following a divorce, Vanderbilt originally designed Eagle’s Nest as a modest, one-story English cottage where he could escape high-society drama.

The Global Scavenger Hunt: Vanderbilt was a passionate yachtsman, explorer, and amateur naturalist. Every time he returned from a global voyage with thousands of marine specimens, cultural artifacts, or architectural pieces, he would impulsively order his architects to build a new wing to house them. This cycle of expansion eventually transformed the modest cottage into a grand, multi-winged Spanish Revival palace.

Salvaging History: During construction, Vanderbilt didn’t just buy new materials, he recycled. When the original Grand Central Station in Manhattan was being demolished, he salvaged massive stone columns and giant carved stone eagles, shipping them to Long Island to line his driveway and grand entrance.

The Spanish Research Trip: To ensure the Spanish Revival aesthetic was perfectly authentic, Vanderbilt paid to send his architect on an extended trip to Spain and North Africa just to study regional masonry, ironwork, and roof tiles.

The Gilded Age estates of Long Island were far more than displays of extreme wealth; they were the physical manifestations of their owners’ deepest passions, anxieties, and romances. Through their obsessive attention to detail, Otto Kahn, Jay Phipps, and William K. Vanderbilt II pioneered a level of elite residential construction that forever changed the landscape of the North Shore.

While hundreds of these grand estates were demolished or carved up into suburban developments after World War II, those that remain serve as quiet monuments to a bygone era of architectural ambition. Walking through these preserved properties today, one can still feel the lingering presence of the visionary, demanding, and deeply creative minds that brought them into existence.

John Caravella Esq., is a construction attorney and formerly practicing project architect at The Law Office of John Caravella, P.C., representing architects, engineers, contractors, subcontractors, and owners in all phases of contract preparation, litigation, and arbitration across New York and Florida. He also serves as an arbitrator to the American Arbitration Association Construction Industry Panel. Mr. Caravella can be reached by email: [email protected] or (631) 608-1346.

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Resources

• Oheka Castle Historic Preservation Archives
• Old Westbury Gardens Historical Collections
• The Suffolk County Vanderbilt Museum and Planetarium
• Society for the Preservation of Long Island Antiquities