This Humongous U.S. Home Has Over Four Acres of Floor Space

Mark Zuckerberg recently became owner of a stunningly expensive $23 million mansion Washington, D.C.’s Woodland Normanstone neighborhood. While the sale, which happened in March, was kept somewhat under wraps, it’s certainly no surprise that people had questions. After all, the sale marks the third most expensive home sale in Washington, D.C.’s history. Zuckerberg’s 15,000-square-foot mansion is just a 12-minute drive from the White House. Many people have surmised that Zuckerberg’s acquisition is an attempt to become closer to President Donald Trump as a way to curry political favor. Others believe that this is just Zuckerberg’s attempt to expand his housing holdings; he has other properties in San Francisco, Palo Alto, Lake Tahoe, and Hawaii. (Mark Zuckerberg’s net worth is up $41 billion.)

While his newly acquired home is undoubtedly impressive, 15,000 square feet hardly touches some of America’s largest homes. Looking throughout our history, using resources like The Daily Hive, Explore, and Largest, you’ll see that even some of the “smallest” exorbitant homes sat at 75,000 square feet or more. Here, 24/7 Wall St. identified America’s biggest homes, ranging from historical homes to contemporary. We listed the twelve homes in order from least square footage to most square footage. Some of the homes on this list are no longer used as houses, but as museums or venues, but they are still included as they did once operate as homes in the past.

This previously published article was updated on April 3, 2025 based on new housing news and a comparison of the Zuckerberg acquisition to historical homes, as well as a recent development in a vandalism case regarding one of these homes. 

Why This Matters Now

The wealthy people who have built the mansions on our list have had a major influence on the American economy and culture. For example, the Vanderbilt Family has multiple homes listed here. This family built their wealth from the American railroad industry in the 1800s. They not only built lavish mansions but became philanthropic, donating millions to build homes in New York City for the underprivileged. More than that, this serves as a reminder of how our nation has changed. Yes, the Zuckerberg home or the 20,000-square-foot Swan Manor for sale for tens of millions offer an insight into our modern elites. But it’s also clear by looking at these nouveau riche people and homes that they have almost nothing on some of the wealthy people of the past. Maybe this’ll encourage Zuckerberg to finally act with a bit more social consciousness?!

Would you live in one of America’s 12 largest houses?: 

12. Indian Neck Hall

• Square Footage: 75,000
• Location: New York
• When Built: 1897

In 1879, Frederick Gilbert Bourne, president of Singer Manufacturing Company, built Indian Neck Hall (also known today as the Bourne Mansion). At the time it was built, this 110-room home was the largest on Long Island. It included three miles of canals in a perfectly manicured garden, an 80-foot greenhouse, a bowling alley, and a roller skating rink. The Bourne family stayed in the home until Frederick passed away. Then, his children sold the estate. In 1926, the home opened as a military academy and is now used as an additional campus by St. John’s University in Queens.

11. Florham 

• Square Footage: 80,000
  
• Location: New Jersey
• When Built: 1899

Florham, a former Vanderbilt property in Morris County, New Jersey, was owned by Florence Adele Vanderbilt. The home cost approximately $5 million to build, equivalent to $146 million today. Florham had 110 rooms, along with several greenhouses, a carriage house, and a dairy farm. The estate was broken up in 1955 and Fairleigh Dicknson University acquired the mansion, as well as 178 acres of garden. Florham may be available to tour on a limited basis.

10. Meadow Brook Hall

• Square Footage: 88,000
• Location: Michigan
• When Built: 1929

Matilda Dodge Wilson, heir to the Dodge Motor Company, had Meadow Brook Hall designed and built for her personal use. The Turdor Revival-style home has 110 rooms and almost 15,000 acres, and cost roughly $4 million to build. In 1957, Matilda donated the house to Michigan to help create Oakland University. Now, it’s a historic museum, the fourth largest in the United States.

Recently, a 24-year-old man was arrested and charged with vandalism after breaking Meadow Brook Hall’s historic stained glass windows.

9. Versailles 

• Square Footage: 90,000
• Location: Florida
• When Built: 2023

Jackie and David Siegel modeled their home in Windermere, Florida after France’s Palace of Vrsailles. This opulent home is believed to have cost over $100 million to build, making it the fourth most expensive home in U.S. history. Versailles and its owners were documented in the 2012 “The Queen of Versailles.” Today, the Siegels enjoy 14 bedrooms, three indoor pools, a video arcade, nine kitchens, and a 20,000-bottle wine cellar. Now that’s fancy!

8. Shadow Lawn 

• Square Footage: 90,000
• Location: New Jersey
• When Built: 1903 and 1929

Originally, Shadow Lawn, a 52-room mansion, was built for John A. McCall and his wife Mary Ignatius Horan. President Woodrow Wilson used the home as his summer home in 1916. However, the original home burned down in 1927. By 1929, it was rebuilt — and bigger than ever. This 130-room home included an indoor pool, solarium, bowling alley, music room, and library, among other fun amentities. Shadow Lawn was declared a National Historic Landmark in 1985, 29 years after it became part of Monmouth University.

7. Winterthur

• Square Footage: 96,582
  
• Location: Delaware
• When Built: 1937

Though 1937 marked the year Winterthur was originally finished, it has undergone several renovations since then. In fact, since 1937, the house has doubled in size. The du Pont family had the house built, and they still own the home all these years later. However, the house is used mostly as a way for the family to collect trinkets and furniture. It’s said that there are over 90,000 trinkets across its 175 rooms, which are available to tour. The museum and estate sit on approximatly 979 acres of land.

6. Arden House

• Square Footage: 97,188
• Location: New York
• When Built: 1909

The Arden House took five years to build for Edward Henry Harriman, a railroad magnate. This historical estate in Harriman, New York was identified as America’s first conference center and certified as a national historical landmark in the 1960s after being gifted to Columbia University. The home passed hands once or twice more, but is currently used by the Research Center on Natural Conservation, a nonprofit. The home offers a conference center and 97 guest rooms for visitors and workers.

5. Whitehall

• Square Footage: 100,000
  
• Location: Florida
• When Built: 1902

Whitehall was once a home for Henry Flagler, one of the founders of Standard Oil, and his third wife. That’s why this home is also referred to sometimes as the Henry M. Flagler House. The 75-room mansion was once described as “More wonderful than any palace in Europe, grander and more magnificent than any other private dwelling in the world…” After the death of Flagler and his wife, Whitehall changed hands for years until Flagler’s granddaughter purchased the property in 1959. Whitehall is now a venue for galas and balls, as well as the Henry Morrison Flagler Museum.

4. The One

• Square Footage: 105,000
• Location: California
• When Built: 2021

This impressive home, the newest on the list, took seven years to build: starting in 2014 and finishing construction in 2021. The Bel Air compound includes both a main residence and three smaller houses, and contains a stunning 21 bedrooms and 42 bathrooms. But that’s not all. The One, now owned by Fashion Nova CEO Richard Saghian, also has a bowling alley, a hair salon, a casino, five swimming pools, and a 30-car garage on property. There’s really no need to ever go off-site.

3. Oheka Castle

• Square Footage: 109,000
• Location: New York
• When Built: 1919

Considering the impressive size of Oheka Castle, you might be surprised to learn that it only took four years to construct. It was financed by Otto Hermann Khan, a German-American investment banker with a penchant for the arts. So it’s no surprise that Oheka Castle was once home to numerous galas and parties during the Jazz Age. In 1919, it cost Hermann Khan $11 million to build — which translates into approximately $158 million in today’s world. While Oheka Castle is no longer a private home, it now operates as a 3-star hotel.

2. Fair Field Mansion

• Square Footage: 110,000
• Location: New York
• When Built: 2003

Ira Rennert, an American businessman and junk bond billionaire, created the Fair Field Mansion in 2003. Rennert had already owned Fair Field — a 63-acre estate — before adding his mansion to the property. Between the home and surrounding buildings, the property encompasses 110,000 square feet. The main home on its own has 29 bedrooms, 39 bathrooms, three pools, a theater,  and even its own power plant — talk about comprehensive! Currently, the property is believed to be valued between $267-500 million.

1. Biltmore Estate 

• Square Footage: 175,000
• Location: North Carolina
• When Built: 1895

The Biltmore House is located just outside of Asheville, North Carolina and currently holds the title for the most expansive home in America. Now known as the Biltmore Estate, the property encompasses a stunning 175,000 square feet — that’s nearly four acres! Originally, this property was built by the Vanderbilt family, more specifically the family of George Washington Vanderbilt II. The Vanderbilts still own the Biltmore to this day. Altogether, the home includes 250 rooms, including 35 bedrooms, 43 bathrooms, and 65 fireplaces. As big as it is, you could stay on this property forever without growing bored. Today, the Biltmore also acts as a historical museum.

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