Rank Area Name Location Built for Owner Year completed Architectural style Architect Image 1 178,926 sq ft (16,622.8 m2 ) Biltmore Estate Asheville, North Carolina George Washington Vanderbilt II The Biltmore Company 1895 Châteauesque Richard Morris Hunt and Frederick Law Olmsted 2 110,000 sq ft (10,000 m2 ) Lynnewood Hall Elkins Park, Pennsylvania Peter A. B. Widener Lynnewood Hall Preservation Foundation 1899 Neoclassical Horace Trumbauer 3 109,000 sq ft (10,100 m2 ) Oheka Castle West Hills, New York Otto Hermann Kahn Gary Melius 1919 Châteauesque Delano and Aldrich 4 105,000 sq ft (9,800 m2 ) The One Bel Air, Los Angeles , California Nile Niami Richard Saghian 2021 Contemporary Paul McClean 5 100,000 sq ft (9,300 m2 ) Whitemarsh Hall Wyndmoor, Pennsylvania Edward T. Stotesbury (demolished in 1980) 1917 Georgian Horace Trumbauer 6 97,188 sq ft (9,029.1 m2 ) Arden House Harriman, New York Edward Henry Harriman Mo Tianquan (via Research Center on Natural Conservation) 1909 Châteauesque Carrère and Hastings 7 96,582 sq ft (8,972.8 m2 ) Winterthur Winterthur, Delaware Henry Francis du Pont Winterthur Museum, Garden and Library 1932 Georgian Revival Henry Francis du Pont 8 (tie) 90,000 sq ft (8,400 m2 ) Cornelius Vanderbilt II House New York, New York Cornelius Vanderbilt II (demolished in 1926) 1882 Châteauesque George B. Post 8 (tie) 90,000 sq ft (8,400 m2 ) Shadow Lawn West Long Branch, New Jersey Hubert T. Parson Monmouth University 1927 Beaux-Arts Horace Trumbauer 9 88,000 sq ft (8,200 m2 ) Meadow Brook Hall Rochester Hills, Michigan Matilda Dodge Wilson Oakland University 1929 Tudor Revival Smith Hinchman & Grylls 10 85,000 sq ft (7,900 m2 ) Versailles Windermere, Florida David A. Siegel (under construction) Châteauesque 11 (tie) 80,000 sq ft (7,400 m2 ) Florham Florham Park, New Jersey Hamilton and Florence Vanderbilt Twombly Fairleigh Dickinson University 1897 Georgian Revival McKim Mead & White 11 (tie) 80,000 sq ft (7,400 m2 ) Harbor Hill Roslyn, New York Clarence H. Mackay (demolished in 1947) 1899 Châteauesque McKim Mead & White 12 75,000 sq ft (7,000 m2 ) Indian Neck Hall Oakdale, New York Frederick Gilbert Bourne St. John's University 1908 Federal Style Ernest Flagg 13 72,215 sq ft (6,709.0 m2 ) Pensmore Highlandville, Missouri Steven T. Huff 2016 Châteauesque 14 72,000 sq ft (6,700 m2 ) Inisfada North Hills, New York Nicholas Frederic Brady (demolished in 2013) 1919 Tudor Revival John Torrey Windrim 15 (tie) 70,000 sq ft (6,500 m2 ) Idle Hour Oakdale, New York William K. Vanderbilt Mercury International 1901 English Country Style Richard Howland Hunt 15 (tie) 70,000 sq ft (6,500 m2 ) Woodlea Briarcliff Manor, New York Elliott Fitch Shepard Sleepy Hollow Country Club 1895 Italian Renaissance Revival McKim, Mead & White 16 68,500 sq ft (6,360 m2 ) Hearst Castle San Simeon, California William Randolph Hearst California Department of Parks and Recreation 1947 Spanish Colonial Revival Julia Morgan 17 66,341 sq ft (6,163.3 m2 ) Grey Towers Castle Glenside, Pennsylvania William Welsh Harrison Arcadia University 1896 Gothic Revival Horace Trumbauer 18 66,000 sq ft (6,100 m2 ) Bill Gates's house Medina, Washington Bill Gates 1995 Pacific Lodge James Cutler 19 64,500 sq ft (5,990 m2 ) Stan Hywet Hall Akron, Ohio Frank Seiberling Stan Hywet Hall Foundation 1915 Tudor Revival Charles Sumner Schneider 20 64,000 sq ft (5,900 m2 ) Fair Field Sagaponack, New York Ira Rennert 2003 Italian Renaissance Mark Ferguson 21 62,482 sq ft (5,804.8 m2 ) The Breakers Newport, Rhode Island Cornelius Vanderbilt II Preservation Society of Newport County 1895 Italian Renaissance Richard Morris Hunt 22 62,220 sq ft (5,780 m2 ) Gemini Manalapan, Florida Gerard Barnes Lambert, Sr Larry Ellison 1940s Mediterranean Revival Marion Sims Wyeth 23 (tie) 60,000 sq ft (5,600 m2 ) Pembroke Glen Cove, New York Joseph De Lamar (demolished in 1968) 1916 Neoclassical C.P.H. Gilbert 24 (tie) 60,000 sq ft (5,600 m2 ) El Mirasol Palm Beach, Florida Edward T. Stotesbury (demolished in 1958) 1920 Spanish Colonial Revival Addison Mizner 25 (tie) 60,000 sq ft (5,600 m2 ) San Sylmar Sylmar, California J.B. Nethercutt Nethercutt-Richards family 1971 Art Deco Tony Hinsbergen 26 58,000 sq ft (5,400 m2 ) Duke Farms Hillsborough Township, New Jersey James Buchanan Duke (demolished in 2016) 1903 Tudor Revival Henry H. Kendall 27 57,000 sq ft (5,300 m2 ) Eschman Meadows Nashport, Ohio Tami Longaberger Awesome87 LLC and SPG87 LLC 2001 Georgian George Acock 28 56,881 sq ft (5,284.4 m2 ) Castle Hill Ipswich, Massachusetts Richard T. Crane Jr. The Trustees of Reservations 1928 English Baroque David Adler 29 56,500 sq ft (5,250 m2 ) The Manor Los Angeles, California Aaron Spelling Petra Ecclestone 1988 Châteauesque James Langenheim & Associates 30 56,368 sq ft (5,236.8 m2 ) Andrew Carnegie Mansion New York, New York Andrew Carnegie Smithsonian Institution 1901 Georgian Revival Babb, Cook & Willard 31 56,000 sq ft (5,200 m2 ) Blairsden Peapack-Gladstone, New Jersey C. Ledyard Blair T. Eric Galloway 1903 Châteauesque Carrère and Hastings 32 55,360 sq ft (5,143 m2 ) Ralston Hall Belmont, California William Chapman Ralston Notre Dame de Namur University 1864 Italianate Henry W. Cleaveland 33 (tie) 55,000 sq ft (5,100 m2 ) White House Washington, D.C. Federal government National Park Service 1800 Neoclassical James Hoban 34 (tie) 55,000 sq ft (5,100 m2 ) Belle Grove White Castle, Louisiana John Andrews (demolished in 1952) 1857 Greek Revival Italianate Henry Howard 35 (tie) 55,000 sq ft (5,100 m2 ) Elm Court Lenox, Massachusetts Emily Thorn Vanderbilt Travaasa Experiential Resorts 1885 American Shingle Style Peabody and Stearns 36 (tie) 55,000 sq ft (5,100 m2 ) Roundwood Manor Hunting Valley, Ohio Van Sweringen brothers Sylvia Korey 1929 Colonial Revival Philip Lindsley Small 36 (tie) 55,000 sq ft (5,100 m2 ) Belton Court Barrington, Rhode Island Frederick Stanhope Peck ShineHarmony, LLC (structure currently abandoned)
1905 Gothic Revival Martin and Hall ; George Frederic Hall 36 (tie) ~55,000 sq ft (5,100 m2 ) Rockwood Hall Mount Pleasant, New York William Rockefeller (demolished in 1942) 1849 Castellated Elizabethan Gervase Wheeler , Carrère and Hastings 37 54,838 sq ft (5,094.6 m2 ) Dumbarton Oaks Washington, D.C. William Hammond Dorsey Harvard University 1801 Colonial Revival 38 54,400 sq ft (5,050 m2 ) Chateau Montagel Shoal Creek, Alabama Larry House Medical Cloud Computing, LLC 1997 Châteauesque Bill Shephard 39 54,246 sq ft (5,039.6 m2 ) Searles Castle Great Barrington, Massachusetts Mary Hopkins Searles Hunt Slonem 1883 Châteauesque McKim Mead & White 40 53,000 sq ft (4,900 m2 ) Nottoway White Castle, Louisiana John Hampden Randolph Paul Ramsay Foundation1858 Greek Revival Italianate Henry Howard 41 52,897 sq ft (4,914.3 m2 ) Hala Ranch Aspen, Colorado Bandar bin Sultan John Paulson 1991 Rustic Hagman Yaw 42 52,300 sq ft (4,860 m2 ) Felix M. Warburg House New York, New York Felix M. Warburg Jewish Museum of New York 1906 Châteauesque Charles Pierrepont Henry Gilbert 43 52,000 sq ft (4,800 m2 ) Villa de Formosa Newport Beach, California Joe C. Wen 2019 Italianate Brian Biglin 44 51,000 sq ft (4,700 m2 ) Hacienda De La Paz Rolling Hills, California John Z. Blazevich John Z. Blazevich 2008 Spanish Colonial Revival Rafael Manzano Martos 45 50,853 sq ft (4,724.4 m2 ) Chase Mansion West Hartford, Connecticut Arnold Chase Arnold Chase 2009 Georgian Allan Greenberg 46 50,729 sq ft (4,712.9 m2 ) Perry Belmont House Washington, D.C. Perry Belmont Order of the Eastern Star 1909 Beaux-Arts Ernest Sanson Horace Trumbauer 47 50,316 sq ft (4,674.5 m2 ) Otto H. Kahn House New York, New York Otto Hermann Kahn Convent of the Sacred Heart 1914 Renaissance Revival J. Armstrong StenhouseCharles Pierrepont Henry Gilbert 48 (tie) 50,000 sq ft (4,600 m2 ) Crocker-McMillin Mansion Mahwah, New Jersey George Crocker Ilija Pavlovic 1907 (renovated before 2018) James Brite and Henry Bacon 48 (tie) 50,000 sq ft (4,600 m2 ) Reid Hall Purchase, New York Whitelaw Reid Manhattanville University 1892 Renaissance Revival Stanford White 48 (tie) 50,000 sq ft (4,600 m2 ) Wingwood House Bar Harbor, Maine Alexander Cassatt (demolished in 1953) 1903 Neoclassical Louis Magaziner 49 (tie) 50,000 sq ft (4,600 m2 ) Riverside New York, New York Charles M. Schwab (demolished in 1948) 1906 Châteauesque Maurice Hébert 49 (tie) 50,000 sq ft (4,600 m2 ) Hempstead House Sands Point, New York Howard Gould Nassau County, New York 1912 Tudor Revival Richard Howland Hunt 49 (tie) 50,000 sq ft (4,600 m2 ) 4545 NE Ocean Boulevard Jensen Beach, Florida Robert Eustace 2007 Italianate 50 49,842 sq ft (4,630.5 m2 ) Lutcher Brown Estate Terrell Hills, TX H. Lutcher Brown Candace Humphreys 1938 Neo Classical Robert M. Ayres 51 49,568 sq ft (4,605.0 m2 ) 8271 E Left Hand Fork Hobble Creek Springville, Utah Tom Mower 2010 Italian Renaissance Kevin Scholz 52 49,300 sq ft (4,580 m2 ) The Pritzker Estate Los Angeles, California Anthony Pritzker 2010 Contemporary Grant Camden Kirkpatrick 53 49,240 sq ft (4,575 m2 ) 32088 SW Peach Cove Road West Linn, Oregon Mark Wattles Richard Stanley (under construction) 54 49,000 sq ft (4,600 m2 ) Ziff Mansion Pawling, New York William Bernard Ziff, Jr. Dirk Edward Ziff 2000 55 48,515 sq ft (4,507.2 m2 ) 50 Poplar Hill Drive Farmington, Connecticut Benjamin Sisti Casey Askar 1985 Contemporary 56 48,438 sq ft (4,500.0 m2 ) 1299 Via Tivoli Henderson, Nevada Pierre Omidyar 2010 Modern architecture 57 48,000 sq ft (4,500 m2 ) Champ d'Or Estate Hickory Creek, Texas Alan H. Goldfield “The Olana” Walter Wedding Estates 2002 French Baroque Architecture 58 47,000 sq ft (4,400 m2 ) Nemours Wilmington, Delaware Alfred I. du Pont Nemours Foundation 1909 Neoclassical Carrère and Hastings 59 46,054 sq ft (4,278.6 m2 ) Greystone Mansion Beverly Hills, California Edward L. Doheny City of Beverly Hills 1928 Tudor Revival Gordon Kaufmann 60 46,050 sq ft (4,278 m2 ) Carolands Hillsborough, California Harriet Pullman Carolan Charles Bartlett Johnson 1914 Second Empire Ernest Sanson Willis Polk 61 46,000 sq ft (4,300 m2 ) Elstowe Manor Elkins Park, Pennsylvania William L. Elkins Landmark Venues 1898 Italian Renaissance Horace Trumbauer 62 45,891 sq ft (4,263.4 m2 ) 457 Bel Air Road Los Angeles, California Beny Alagem 2006 French Normandy Robert A.M. Stern 63 45,854 sq ft (4,260.0 m2 ) Villa Collina Moorestown, New Jersey Vernon Hill 2002 Italian Renaissance 64 45,843 sq ft (4,259.0 m2 ) Townsend House Washington, D.C. Richard T. Townsend Cosmos Club 1901 Beaux-Arts Carrère and Hastings 65 (tie) 45,000 sq ft (4,200 m2 ) Illinois Executive Mansion Springfield, Illinois State of Illinois 1855 Georgian Revival John M. Van Osdel 66 (tie) 45,000 sq ft (4,200 m2 ) Yaddo Saratoga Springs, New York Spencer Trask Corporation of Yaddo 1893 Tudor Revival William Halsey Wood 66 (tie) 45,000 sq ft (4,200 m2 ) Darlington Mahwah, New Jersey George Crocker Jaime Garrido 1907 Jacobean James Brite 66 (tie) 45,000 sq ft (4,200 m2 ) Henry Clay Frick House New York, New York Henry Clay Frick Frick Collection 1914 Beaux-Arts Carrère and Hastings 67 44,936 sq ft (4,174.7 m2 ) Anderson House Washington, D.C. Larz Anderson Society of the Cincinnati 1905 Beaux-Arts Arthur Little 68 44,925 sq ft (4,173.7 m2 ) Le Palais Beverly Hills, California Mohamed Hadid Lola Karimova-Tillyaeva [citation needed 2011 Châteauesque 69 44,309 sq ft (4,116.4 m2 ) Glencairn Bryn Athyn, Pennsylvania Raymond Pitcairn The New Church 1938 Romanesque Raymond Pitcairn 70 44,234 sq ft (4,109.5 m2 ) Villa Vittoriosa Fayetteville, Georgia Evander Holyfield Rick Ross 1994 Neoclassical Portman Fuchtman Vinson Sunderland 71 44,229 sq ft (4,109.0 m2 ) Ochre Court Newport, Rhode Island Ogden Goelet Salve Regina University 1892 Châteauesque Richard Morris Hunt 72 44,000 sq ft (4,100 m2 ) Hyde Park Hyde Park, New York Frederick Vanderbilt National Park Service 1899 Beaux-Arts Charles Follen McKim 73 43,793 sq ft (4,068.5 m2 ) Boldt Castle Alexandria Bay, New York George Boldt Thousand Islands Bridge Authority 1904 Chateauesque G.W. & W.D. Hewitt 74 43,561 sq ft (4,046.9 m2 ) Marland Mansion Ponca City, Oklahoma Ernest Whitworth Marland City of Ponca City 1928 Mediterranean Revival John Duncan Forsyth 75 43,557 sq ft (4,046.6 m2 ) 901 Trophy Hills Drive Las Vegas, Nevada Sheldon Adelson 2013 76 43,515 sq ft (4,042.7 m2 ) Asherwood Carmel, Indiana Melvin Simon Great American Songbook Foundation 1999 Chateauesque 77 43,040 sq ft (3,999 m2 ) Primatara Springfield, Missouri Robert Low Robert Low (under construction) Richard Drummond Davis 78 42,831 sq ft (3,979.1 m2 ) Château des Fleurs Los Angeles, California James A. Kaplan 2014 Chateauesque William Hefner 79 42,014 sq ft (3,903.2 m2 ) 51 Winding Brook Drive Saratoga Springs, New York John Breyo 2006 Mediterranean Revival Robert Flansburg 80 (tie) 42,000 sq ft (3,900 m2 ) Payne Mansion Esopus, New York Oliver Hazard Payne Marist College 1911 Beaux-Arts Carrère and Hastings 81 (tie) 42,000 sq ft (3,900 m2 ) Rose Terrace Grosse Pointe Farms, Michigan Anna Thompson Dodge (demolished in 1976) 1931 Neoclassical Horace Trumbauer 82 41,774 sq ft (3,880.9 m2 ) Le Palais Royal Hillsboro Beach, Florida Robert Pereira 2014 Beaux-Arts Denio Madera 83 40,050 sq ft (3,721 m2 ) Carolands Hillsborough, California Harriet Pullman Carolan Charles Bartlett Johnson 1914 Second Empire Ernest Sanson Willis Polk 84 (tie) 41,000 sq ft (3,800 m2 ) Hayes Mansion - San Jose, a Curio Collection by Hilton San Jose, California Mary Hayes Chynoweth JMA Ventures 1905 Mediterranean Revival George Page 85 (tie) 41,000 sq ft (3,800 m2 ) NYIT de Seversky Mansion Old Westbury, New York Alfred I. du Pont New York Institute of Technology 1918 Georgian Revival Carrère and Hastings 86 40,916 sq ft (3,801.2 m2 ) Il Palmetto Palm Beach, Florida Joseph E. Widener James H. Clark 1927 Mediterranean Revival Maurice Fatio 87 40,280 sq ft (3,742 m2 ) Walker McCune Mansion Paradise Valley, Arizona Walker McCune George A. Hormel family1962 Contemporary 88 (tie) 40,000 sq ft (3,700 m2 ) Mills Mansion Hyde Park, New York Ogden Mills New York State Office of Parks, Recreation and Historic Preservation 1896 Beaux-Arts Stanford White 88 (tie) 40,000 sq ft (3,700 m2 ) The Braes Glen Cove, New York Herbert L. Pratt Webb Institute 1912 Jacobean James Brite 88 (tie) 40,000 sq ft (3,700 m2 ) Coe Hall Upper Brookville, New York William Robertson Coe Planting Fields Foundation 1921 Tudor Revival Guy Lowell 88 (tie) 40,000 sq ft (3,700 m2 ) Rynwood Old Brookville, New York Samuel Agar Salvage John Mariani Jr 1927 Tudor Revival Roger Bullard 88 (tie) 40,000 sq ft (3,700 m2 ) 10697 Somma Way Los Angeles, California Ty Cueva 2017 Spanish Colonial Revival 89 39,648 sq ft (3,683.4 m2 ) Seaview Terrace Newport, Rhode Island Edson Bradley Martin Carey 1925 Chateauesque Howard Greenley 90 39,400 sq ft (3,660 m2 ) 137 Beech Ridge Dr ’Villa Noci’
Bell Acres , Pennsylvania
Joseph Nocito Sr. 2003 Chateauesque 91 38,000 sq ft (3,500 m2 ) 5501 W Hamilton Road S ‘Pizza Hut Mansion’
Fort Wayne, Indiana Dick Freeland 1997 Chateauesque 
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