Rank
Area Name Location Built for Owner
Year completed Architectural style Architect Image
1 178,926 sq ft (16,622.8 m 2 ) [2] Biltmore Estate Asheville, North Carolina
George Washington Vanderbilt II
The Biltmore Company [3] 1895 Châteauesque Richard Morris Hunt and Frederick Law Olmsted
2 109,848 sq ft (10,205.2 m 2 ) Lynnewood Hall Elkins Park, Pennsylvania Peter A. B. Widener [4] Lynnewood Hall Preservation Foundation 1899 Neoclassical Horace Trumbauer
3 109,000 sq ft (10,100 m 2 ) [5] Oheka Castle West Hills, New York Otto Hermann Kahn Gary Melius [6] 1919 Châteauesque Delano and Aldrich
4
105,000 sq ft (9,800 m 2 )
The One
Bel Air, Los Angeles , California
Nile Niami
Richard Saghian [7]
2021
Contemporary
Paul McClean
5 (tie)
100,000 sq ft (9,300 m 2 ) Whitemarsh Hall Wyndmoor, Pennsylvania Edward T. Stotesbury (demolished in 1980)[8] 1917 Georgian Horace Trumbauer
5 (tie)
100,000 sq ft (9,300 m 2 ) [9] Whitehall (Henry M. Flagler House) Palm Beach, Florida Henry Flagler Henry Morrison Flagler Museum 1901 Beaux-Arts Pottier & Stymus, Carrère and Hastings
6 97,188 sq ft (9,029.1 m 2 ) [10] Arden House Harriman, New York Edward Henry Harriman Mo Tianquan (via Research Center on Natural Conservation)[11] [12] [13] [14] [15] 1909 Châteauesque Carrère and Hastings
7 96,582 sq ft (8,972.8 m 2 ) 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 m 2 ) 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 m 2 ) Shadow Lawn West Long Branch, New Jersey Hubert T. Parson Monmouth University 1927 Beaux-Arts Horace Trumbauer
9 88,000 sq ft (8,200 m 2 ) [16] Meadow Brook Hall Rochester Hills, Michigan Matilda Dodge Wilson Oakland University 1929 Tudor Revival Smith Hinchman & Grylls
10 85,000 sq ft (7,900 m 2 ) [17] Versailles Windermere, Florida David A. Siegel [18] [19] [20] (under construction) Châteauesque
11 (tie) 80,000 sq ft (7,400 m 2 ) 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 m 2 ) Harbor Hill Roslyn, New York Clarence H. Mackay (demolished in 1947) 1899 Châteauesque McKim Mead & White
12 75,000 sq ft (7,000 m 2 ) 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 m 2 ) [21] [22] [23] Pensmore Highlandville, Missouri Steven T. Huff [24] [25] [26] [27] 2016 Châteauesque
14 72,000 sq ft (6,700 m 2 ) 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 m 2 ) 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 m 2 ) [28] 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 m 2 ) [29] 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 m 2 ) [30] Grey Towers Castle Glenside, Pennsylvania William Welsh Harrison [31] Arcadia University 1896 Gothic Revival Horace Trumbauer
18 66,000 sq ft (6,100 m 2 )
Bill Gates's house Medina, Washington Bill Gates [32] 1995 Pacific Lodge James Cutler
19 64,500 sq ft (5,990 m 2 ) [33] Stan Hywet Hall Akron, Ohio Frank Seiberling Stan Hywet Hall Foundation[34] 1915 Tudor Revival Charles Sumner Schneider
20 64,000 sq ft (5,900 m 2 ) [35] Fair Field Sagaponack, New York Ira Rennert [36] 2003 Italian Renaissance Mark Ferguson[37]
21 62,482 sq ft (5,804.8 m 2 ) [38] 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 m 2 ) [39] Gemini Manalapan, Florida Gerard Barnes Lambert, Sr[40] Larry Ellison 1940s Mediterranean Revival Marion Sims Wyeth Edson E. Dailey[41]
23 (tie) 60,000 sq ft (5,600 m 2 ) Pembroke Glen Cove, New York Joseph De Lamar (demolished in 1968) 1916 Neoclassical C.P.H. Gilbert
23 (tie) 60,000 sq ft (5,600 m 2 ) El Mirasol Palm Beach, Florida Edward T. Stotesbury (demolished in 1958) 1920 Spanish Colonial Revival Addison Mizner
23 (tie)
60,000 sq ft (5,600 m 2 ) [42]
San Sylmar
Sylmar, California
J.B. Nethercutt
Nethercutt-Richards family
1971
Art Deco
Tony Hinsbergen
24 58,000 sq ft (5,400 m 2 ) [43] Duke Farms Hillsborough Township, New Jersey James Buchanan Duke (demolished in 2016) 1903 Tudor Revival Henry H. Kendall
25 57,000 sq ft (5,300 m 2 ) [44] Eschman Meadows Nashport, Ohio Tami Longaberger[45] Awesome87 LLC and SPG87 LLC[46] [47]
2001 Georgian George Acock Phil White
26 56,881 sq ft (5,284.4 m 2 ) Castle Hill Ipswich, Massachusetts Richard T. Crane Jr. The Trustees of Reservations 1928 English Baroque David Adler
27 56,500 sq ft (5,250 m 2 ) [48] The Manor Los Angeles, California Aaron Spelling Petra Ecclestone [49] 1988 Châteauesque James Langenheim & Associates
28 56,368 sq ft (5,236.8 m 2 ) [50] Andrew Carnegie Mansion New York, New York Andrew Carnegie Smithsonian Institution 1901 Georgian Revival Babb, Cook & Willard
29 56,000 sq ft (5,200 m 2 ) [51] Blairsden Peapack-Gladstone, New Jersey C. Ledyard Blair T. Eric Galloway[52] 1903 Châteauesque Carrère and Hastings
30 55,360 sq ft (5,143 m 2 ) Ralston Hall Belmont, California William Chapman Ralston Notre Dame de Namur University 1864 Italianate Henry W. Cleaveland
31 (tie) 55,000 sq ft (5,100 m 2 ) White House Washington, D.C. Federal government National Park Service 1800 Neoclassical James Hoban
31 (tie) 55,000 sq ft (5,100 m 2 ) Belle Grove White Castle, Louisiana John Andrews (demolished in 1952) 1857 Greek Revival Italianate Henry Howard
31 (tie) 55,000 sq ft (5,100 m 2 ) Elm Court Lenox, Massachusetts Emily Thorn Vanderbilt Travaasa Experiential Resorts [53]
1885 American Shingle Style Peabody and Stearns
31 (tie) 55,000 sq ft (5,100 m 2 ) Roundwood Manor Hunting Valley, Ohio Van Sweringen brothers Sylvia Korey[54] 1929 Colonial Revival Philip Lindsley Small
31 (tie)
55,000 sq ft (5,100 m 2 )
Belton Court
Barrington, Rhode Island
Frederick Stanhope Peck
ShineHarmony, LLC
(structure currently abandoned)[55]
1905
Gothic Revival
Martin and Hall ; George Frederic Hall
31 (tie) ~55,000 sq ft (5,100 m 2 ) Rockwood Hall Mount Pleasant, New York William Rockefeller (demolished in 1942) 1849 Castellated Elizabethan Gervase Wheeler , Carrère and Hastings
32 54,838 sq ft (5,094.6 m 2 ) [56] Dumbarton Oaks Washington, D.C. William Hammond Dorsey Harvard University 1801 Colonial Revival
33 54,400 sq ft (5,050 m 2 ) [57] Chateau Montagel Shoal Creek, Alabama Larry House Medical Cloud Computing, LLC[58] 1997[59] Châteauesque Bill Shephard[60]
34 54,246 sq ft (5,039.6 m 2 ) [61] Searles Castle Great Barrington, Massachusetts Mary Hopkins Searles Hunt Slonem 1883 Châteauesque McKim Mead & White
35 53,000 sq ft (4,900 m 2 ) Nottoway White Castle, Louisiana John Hampden Randolph Paul Ramsay Foundation[62] 1858 Greek Revival Italianate Henry Howard
36 52,897 sq ft (4,914.3 m 2 ) [63] Hala Ranch Aspen, Colorado Bandar bin Sultan John Paulson [64] 1991 Rustic Hagman Yaw
37 52,300 sq ft (4,860 m 2 ) [65] Felix M. Warburg House New York, New York Felix M. Warburg Jewish Museum of New York 1906 Châteauesque Charles Pierrepont Henry Gilbert
38 52,000 sq ft (4,800 m 2 ) Villa de Formosa Newport Beach, California Joe C. Wen[66] 2019 Italianate Brian Biglin[67]
39 51,000 sq ft (4,700 m 2 ) [68] Hacienda De La Paz Rolling Hills, California John Z. Blazevich John Z. Blazevich[69] 2008 Spanish Colonial Revival Rafael Manzano Martos
40 50,853 sq ft (4,724.4 m 2 ) Chase Mansion West Hartford, Connecticut Arnold Chase Arnold Chase[70] 2009 Georgian Allan Greenberg
41 50,729 sq ft (4,712.9 m 2 ) [71] Perry Belmont House Washington, D.C. Perry Belmont Order of the Eastern Star 1909 Beaux-Arts Ernest Sanson Horace Trumbauer
42 50,316 sq ft (4,674.5 m 2 ) [72] 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
43 50,302 sq ft (4,673.2 m 2 ) [73] Hillside School Berkeley, California Berkeley Unified School District Sam Seppala 1925 Tudor Revival Walter H. Ratcliff
44 (tie) 50,000 sq ft (4,600 m 2 ) [74] Crocker-McMillin Mansion Mahwah, New Jersey George Crocker Ilija Pavlovic[75]
1907 (renovated before 2018) James Brite and Henry Bacon
44 (tie) 50,000 sq ft (4,600 m 2 ) Reid Hall Purchase, New York Whitelaw Reid Manhattanville University 1892 Renaissance Revival Stanford White
44 (tie) 50,000 sq ft (4,600 m 2 ) Wingwood House Bar Harbor, Maine Alexander Cassatt (demolished in 1953) 1903 Neoclassical Louis Magaziner
44 (tie)
50,000 sq ft (4,600 m 2 ) Riverside New York, New York Charles M. Schwab (demolished in 1948) 1906 Châteauesque Maurice Hébert
44 (tie) 50,000 sq ft (4,600 m 2 ) [76] Hempstead House Sands Point, New York Howard Gould Nassau County, New York 1912 Tudor Revival Richard Howland Hunt
44 (tie) 50,000 sq ft (4,600 m 2 ) 4545 NE Ocean Boulevard Jensen Beach, Florida Robert Eustace[77] 2007 Italianate
45 49,842 sq ft (4,630.5 m 2 ) [78] Lutcher Brown Estate Terrell Hills, TX H. Lutcher Brown [78] }Candace Humphreys[79] 1938 Neo Classical [80] Robert M. Ayres [81]
46 49,568 sq ft (4,605.0 m 2 ) [82] 8271 E Left Hand Fork Hobble Creek Springville, Utah Tom Mower[83] 2010 Italian Renaissance Kevin Scholz
47 49,300 sq ft (4,580 m 2 ) [84] The Pritzker Estate Los Angeles, California Anthony Pritzker [85] 2010 Contemporary Grant Camden Kirkpatrick
48 49,240 sq ft (4,575 m 2 ) [86] 32088 SW Peach Cove Road West Linn, Oregon Mark Wattles[87] Richard Stanley (under construction)
49 49,000 sq ft (4,600 m 2 ) [88] Ziff Mansion Pawling, New York William Bernard Ziff, Jr. Dirk Edward Ziff [89] 2000
50 48,515 sq ft (4,507.2 m 2 ) [90] 50 Poplar Hill Drive Farmington, Connecticut Benjamin Sisti[91] Casey Askar[92] 1985 Contemporary
51 48,438 sq ft (4,500.0 m 2 ) [93] 1299 Via Tivoli Henderson, Nevada Pierre Omidyar [94] 2010 Modern architecture
52
48,000 sq ft (4,500 m 2 )
Champ d'Or Estate
Hickory Creek, Texas
Alan H. Goldfield
“The Olana” Walter Wedding Estates
2002[95]
French Baroque Architecture
53 47,000 sq ft (4,400 m 2 ) Nemours Wilmington, Delaware Alfred I. du Pont Nemours Foundation 1909 Neoclassical Carrère and Hastings
54 46,054 sq ft (4,278.6 m 2 ) [96] Greystone Mansion Beverly Hills, California Edward L. Doheny City of Beverly Hills 1928 Tudor Revival Gordon Kaufmann
55 46,050 sq ft (4,278 m 2 ) [97] Carolands Hillsborough, California Harriet Pullman Carolan[98] Charles Bartlett Johnson [99] 1914 Second Empire Ernest Sanson Willis Polk
56 46,000 sq ft (4,300 m 2 ) [100] Elstowe Manor Elkins Park, Pennsylvania William L. Elkins Landmark Venues [101] 1898 Italian Renaissance Horace Trumbauer
57 45,891 sq ft (4,263.4 m 2 ) [102] 457 Bel Air Road Los Angeles, California Beny Alagem [103] 2006 French Normandy Robert A.M. Stern [104]
58 45,854 sq ft (4,260.0 m 2 ) [105] Villa Collina Moorestown, New Jersey Vernon Hill [106] 2002 Italian Renaissance [105]
59 45,843 sq ft (4,259.0 m 2 ) [107] Townsend House Washington, D.C. Richard T. Townsend Cosmos Club 1901 Beaux-Arts Carrère and Hastings
60 (tie) 45,000 sq ft (4,200 m 2 ) [108] Illinois Executive Mansion Springfield, Illinois State of Illinois 1855 Georgian Revival John M. Van Osdel
61 (tie) 45,000 sq ft (4,200 m 2 ) [109]
Yaddo Saratoga Springs, New York Spencer Trask [110] Corporation of Yaddo[110] 1893 Tudor Revival William Halsey Wood
62 (tie) 45,000 sq ft (4,200 m 2 ) [111]
Darlington Mahwah, New Jersey George Crocker Jaime Garrido[112] 1907 Jacobean James Brite
63 (tie) 45,000 sq ft (4,200 m 2 ) [113]
Henry Clay Frick House New York, New York Henry Clay Frick Frick Collection 1914 Beaux-Arts Carrère and Hastings
64 44,936 sq ft (4,174.7 m 2 ) [114] Anderson House Washington, D.C. Larz Anderson Society of the Cincinnati 1905 Beaux-Arts Arthur Little Herbert Browne
65 44,925 sq ft (4,173.7 m 2 ) Le Palais Beverly Hills, California Mohamed Hadid Lola Karimova-Tillyaeva [ citation needed ] 2011 Châteauesque
66 44,309 sq ft (4,116.4 m 2 ) [115] Glencairn Bryn Athyn, Pennsylvania Raymond Pitcairn The New Church 1938 Romanesque Raymond Pitcairn
67 44,234 sq ft (4,109.5 m 2 ) [116] [117] Villa Vittoriosa Fayetteville, Georgia Evander Holyfield Rick Ross [117] 1994 Neoclassical Portman Fuchtman Vinson Sunderland
68 44,229 sq ft (4,109.0 m 2 ) [118] Ochre Court Newport, Rhode Island Ogden Goelet Salve Regina University 1892 Châteauesque Richard Morris Hunt
69 44,000 sq ft (4,100 m 2 ) [119] Hyde Park Hyde Park, New York Frederick Vanderbilt National Park Service 1899 Beaux-Arts Charles Follen McKim
70 43,793 sq ft (4,068.5 m 2 ) [120] Boldt Castle Alexandria Bay, New York George Boldt [121] Thousand Islands Bridge Authority[122] 1904 Chateauesque G.W. & W.D. Hewitt
71 43,561 sq ft (4,046.9 m 2 ) [123] Marland Mansion Ponca City, Oklahoma Ernest Whitworth Marland [124] City of Ponca City [125] 1928 Mediterranean Revival John Duncan Forsyth
72 43,557 sq ft (4,046.6 m 2 ) 901 Trophy Hills Drive Las Vegas, Nevada Sheldon Adelson 2013
73 43,515 sq ft (4,042.7 m 2 ) [126] Asherwood Carmel, Indiana Melvin Simon [127] Great American Songbook Foundation [128] 1999 Chateauesque
74 43,040 sq ft (3,999 m 2 ) [129] Primatara Springfield, Missouri Robert Low Robert Low[130] (under construction) Richard Drummond Davis
75 42,831 sq ft (3,979.1 m 2 ) [131] Château des Fleurs Los Angeles, California James A. Kaplan[132] 2014 Chateauesque William Hefner
76 42,014 sq ft (3,903.2 m 2 ) [133] 51 Winding Brook Drive Saratoga Springs, New York John Breyo[134] 2006 Mediterranean Revival Robert Flansburg[135]
77 (tie) 42,000 sq ft (3,900 m 2 ) Payne Mansion Esopus, New York Oliver Hazard Payne [136] Marist College [137] 1911 Beaux-Arts Carrère and Hastings
77 (tie) ~42,000 sq ft (3,900 m 2 ) [Note 1] Mar-a-Lago Palm Beach, Florida Marjorie Merriweather Post Donald J. Trump 1927 Mediterranean Revival architecture Marion Sims Wyeth (exterior) Joseph Urban (interior)
77 (tie) 42,000 sq ft (3,900 m 2 ) Rose Terrace Grosse Pointe Farms, Michigan Anna Thompson Dodge [138] (demolished in 1976) 1931 Neoclassical Horace Trumbauer
78 41,774 sq ft (3,880.9 m 2 ) [139] Le Palais Royal Hillsboro Beach, Florida Robert Pereira[140] 2014 Beaux-Arts Denio Madera
79 (tie) 41,000 sq ft (3,800 m 2 ) [141] Hayes Mansion - San Jose, a Curio Collection by Hilton San Jose, California Mary Hayes Chynoweth[142] JMA Ventures[143] 1905 Mediterranean Revival George Page
79 (tie) 41,000 sq ft (3,800 m 2 ) [144] NYIT de Seversky Mansion Old Westbury, New York Alfred I. du Pont [145] New York Institute of Technology [146] 1918 Georgian Revival Carrère and Hastings
80 40,916 sq ft (3,801.2 m 2 ) [147] Il Palmetto Palm Beach, Florida Joseph E. Widener [148] James H. Clark [149] 1927 Mediterranean Revival Maurice Fatio
81 40,280 sq ft (3,742 m 2 ) [150] Walker McCune Mansion Paradise Valley, Arizona Walker McCune[151] George A. Hormel family[152] 1962 Contemporary
82 40,050 sq ft (3,721 m 2 ) [97] Carolands Hillsborough, California Harriet Pullman Carolan[98] Charles Bartlett Johnson [99] 1914 Second Empire Ernest Sanson Willis Polk
83 (tie) 40,000 sq ft (3,700 m 2 ) Mills Mansion Hyde Park, New York Ogden Mills [153] New York State Office of Parks, Recreation and Historic Preservation [154] 1896 Beaux-Arts Stanford White
83 (tie) 40,000 sq ft (3,700 m 2 ) The Braes Glen Cove, New York Herbert L. Pratt [155] Webb Institute [156] 1912 Jacobean James Brite
83 (tie) 40,000 sq ft (3,700 m 2 ) Coe Hall Upper Brookville, New York William Robertson Coe [157] Planting Fields Foundation [158] 1921 Tudor Revival Guy Lowell
83 (tie) 40,000 sq ft (3,700 m 2 ) [159] Rynwood Old Brookville, New York Samuel Agar Salvage [160] John Mariani Jr [161] 1927 Tudor Revival Roger Bullard
83 (tie) 40,000 sq ft (3,700 m 2 ) [162] 10697 Somma Way Los Angeles, California Ty Cueva[163] 2017 Spanish Colonial Revival
84 39,648 sq ft (3,683.4 m 2 ) [164] Seaview Terrace Newport, Rhode Island Edson Bradley [165] Martin Carey 1925 Chateauesque Howard Greenley
85
39,400 sq ft (3,660 m 2 )
137 Beech Ridge Dr
’Villa Noci ’
Bell Acres ,
Pennsylvania
Joseph Nocito Sr.
2003[166]
Chateauesque
86 (tie)
38,000 sq ft (3,500 m 2 )
5501 W Hamilton Road S
‘Pizza Hut Mansion ’
Fort Wayne, Indiana
Dick Freeland
1997
Chateauesque
86 (tie)
38,000 sq ft (3,500 m 2 ) [167]
Vizcaya Museum and Gardens
Miami, Florida
James Deering
Miami-Dade County
1916
Mediterranean Revival Style
F. Burrall Hoffman
86 (tie)
38,000 sq ft (3,500 m 2 ) [168]
Charles Gates Mansion
Minneapolis, Minnesota
Charles Gilbert Gates
Demolished in 1933
1914
Renaissance Revival