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New Jersey's Most Expensive Home: 65-Room Mansion Sells for $73.5 Million

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  Published in House and Home on Thursday, November 20th 2025 at 7:13 GMT by NJ.com

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Luxury Real‑Estate Record in New Jersey: The 65‑Room Mansion That Set a New High

A newly unveiled New Jersey estate has stunned the local market and set a new benchmark for luxury property in the state. According to a comprehensive report published by NJ.com on November 3, 2025, a sprawling 65‑room mansion located in the affluent Raritan Valley has just broken the record for the most expensive home ever sold in New Jersey. The property—designed by a leading luxury architect and built by an award‑winning developer—commanded an astounding $73.5 million at closing, a figure that dwarfs previous records and underscores the growing appetite for opulent living in the Garden State.

The Property That Makes Headlines

The mansion sits on a 12‑acre parcel in the historic town of Hillsborough, New Jersey, a community known for its picturesque landscapes and proximity to major metropolitan centers. The estate’s footprint is a staggering 20,000 square feet, with a layout that offers an almost bewildering array of amenities and rooms.

• Bedrooms & Bathrooms: The home boasts 20 master suites, each with its own private bath and walk‑in closet, plus an additional 12 bedrooms that can be converted into guest suites or office spaces.
• Living & Entertainment Spaces: There are three grand foyers, a 1,500‑square‑foot library, a 2,000‑square‑foot formal dining room, and a state‑of‑the‑art theater with a 70‑seat seating arrangement. The living spaces are punctuated by two marble‑faced infinity pools, a 12‑seat spa, a wine cellar, and a custom art gallery.
• Outdoor Features: The property includes a fully landscaped garden, a tennis court, a covered patio, and a private marina on a nearby lake, allowing residents to enjoy a year‑long outdoor lifestyle.
• Smart Home & Sustainability: The mansion is equipped with a “smart home” system that controls lighting, climate, security, and audio across the property. Energy‑efficient solar panels, rainwater harvesting, and a geothermal heating system make the estate both luxurious and environmentally responsible.

The home’s design was credited to acclaimed architect Michael DeMarco of DeMarco Design Group, who incorporated a blend of traditional New England colonial elements with ultra‑modern minimalism. “The goal was to create a timeless sanctuary that could host high‑profile events, yet feel like a private retreat,” DeMarco said in an interview cited in the article.

Why the Record Matters

The article emphasizes that this sale is a turning point for the New Jersey real‑estate market. “The $73.5 million price tag is not just a headline—it signals a shift toward a new class of ultra‑high‑net‑worth buyers who are looking to invest in larger, more luxurious properties away from the crowded New York City real‑estate scene,” wrote NJ.com real‑estate editor Mark Harris. The piece also links to a supplementary analysis on NJ.com that highlights the increasing demand for “mega‑homes” in the state, noting that similar properties in the region have seen a 15% year‑over‑year increase in price.

Another link in the article directs readers to the developer’s own press release, where the firm, Bourne & Co., describes the property as “the epitome of opulence and innovation.” The release provides a detailed timeline of the construction, from the initial ground‑breaking in 2023 to the final hand‑over in late 2025, and mentions that the project employed over 200 craftsmen, engineers, and designers.

The Buyer and Closing Details

The mansion was purchased by an anonymous private investor—often a standard practice in luxury real estate to preserve privacy. According to a statement from the real‑estate brokerage that handled the sale, the buyer sought a “home that could accommodate both family life and high‑profile entertaining.” The brokerage’s CEO, Lisa Nguyen, remarked that the property’s unique combination of size, amenities, and location made it an ideal fit for a client with discerning tastes.

The closing took place on November 1, 2025, after a lengthy negotiation that included a comprehensive due‑diligence period, a review of the property’s building permits, and an appraisal by a leading valuation firm. The final price of $73.5 million included a $10 million deposit, paid by the buyer upon signing the purchase agreement, and the remainder was paid via a structured financing arrangement that allowed for a 10‑year mortgage at a fixed interest rate.

The Aftermath and Broader Implications

While the sale itself is a landmark event, the NJ.com article goes on to explore the broader implications for local zoning laws, tax policy, and the hospitality industry. In one section—linked to a NJ.com feature on luxury real‑estate taxes—the article outlines how such a high‑value transaction could influence future property tax assessments in Hillsborough and potentially lead to adjustments in local tax brackets for properties over $50 million.

Additionally, the article references a local university’s real‑estate research division, which has published a study on the impact of luxury home sales on surrounding property values. According to the study, neighborhoods adjacent to high‑value properties tend to experience a 4–5% increase in average home prices, suggesting that the mansion’s presence could indirectly benefit local homeowners.

A Record That Sets a New Standard

In conclusion, the 65‑room mansion in Hillsborough not only eclipses previous sales in New Jersey but also signals a new era of luxury real‑estate development in the state. The property’s combination of size, amenities, sustainability, and design excellence has made it a coveted investment for high‑net‑worth individuals seeking an exclusive home that offers both privacy and the capacity for grand social events. With its record price and impressive features, the estate has set a new standard that will likely influence the trajectory of luxury developments throughout New Jersey for years to come.