{{Short description|Mansion in Long Island, New York, USA}} {{Use American English|date=September 2025}} {{Infobox mountain | name = Harbor Hill | image = American estates and gardens (1904) (14781237585).jpg | image_caption = | elevation_ft = 348 | elevation_ref = | prominence_ft = 348.0 | prominence_ref = | parent_peak = | map = New York | map_caption = Location of Harbor Hill in New York State | map_size = 225 | label_position = top | listing = New York County High Points 58th | location = Roslyn, New York,<br/>United States | range = | coordinates = {{coord|40|47|57|N|73|38|22|W|type:mountain_scale:100000|format=dms|display=inline,title}} | coordinates_ref = | topo = USGS Sea Cliff | type = | age = | volcanic_arc/belt = | last_eruption = | first_ascent = | easiest_route = }}

'''Harbor Hill''' was a large Long Island mansion built from 1899 to 1902 in the present-day Village of East Hills, New York, for telecommunications magnate Clarence Hungerford Mackay.

It was designed by McKim, Mead & White, with Stanford White supervising the project – the largest private residence he ever designed; it was demolished in 1949.<ref>[https://web.archive.org/web/20070311002751/http://www.antiquesandthearts.com/archive/stan.htm Stanford White on Long Island; Exhibit at the Museums at Stony Brook to November 1 (Antiques and the Arts Online)]</ref>

The home was built atop the {{convert|348|ft|adj=on}} Harbor Hill – the highest point in Nassau County, New York; the hill itself is located in both the Villages of East Hills and Roslyn.<ref name=":0" />

==History== thumb|left|300px|Harbor Hill in 1922 Clarence Mackay (1874–1938) was the son of Comstock Lode magnate John William Mackay, and inherited much of an estimated $500 million fortune upon his father's death in 1902 (approximately $13 billion in 2012 dollars). White collaborated closely with Clarence Mackay's wife, Katharine Duer Mackay (1880–1930), and with her approval based the main façade of Harbor Hill upon that of François Mansart's Château de Maisons of 1642, using a mix of other influences to finish the overall design.

Built at great expense and furnished lavishly (at least three different decorating firms were employed), the home originally sat on {{convert|688|acre|km2}} and enjoyed views across Roslyn Harbor to Long Island Sound. Formal terraces and gardens were finished by Guy Lowell.

Social events held at the house included a grand party for the then Prince of Wales (later Edward VIII and the Duke of Windsor) in 1924.<ref>{{Cite web|url=http://www.mackayhistory.com/HarborHill.html|archive-url=https://web.archive.org/web/20040815115733/http://www.mackayhistory.com/HarborHill.html|url-status=usurped|archive-date=August 15, 2004|title = HarborHill}}</ref>

On June 13, 1927, Charles Lindbergh, accompanied by his mother and the Mayor of New York, was feted at a banquet and dance Mackay held the night of transatlantic aviator's ticker-tape parade on 5th Avenue.<ref>Bill Bryson, "One Summer: America, 1927" (Doubleday 1913)</ref>

In 1931, upon the incorporation of the Village of East Hills, the estate was included within the boundaries of that municipality.<ref name="nris" />

thumb|300px|right|Fountain by Henri-Léon Gréber, now in Kansas City

The building was vandalized during World War II, and demolished in 1947.<ref>{{cite web |url=https://www.roslynlandmarks.org/profiles/harbor-hill-estate|title=Harbor Hill Country Home (Estate of Clarence Mackay) &#124; Profiles &#124; Roslyn Landmark Society}}</ref> After Harbor Hill was razed; a fountain with four equestrian statues designed by Henri-Léon Gréber was moved to Kansas City, Missouri, where it is displayed adjacent to Country Club Plaza. {{Clear}}

===Summit=== At an elevation of 348 feet Harbor Hill is the highest point in Nassau County, New York.<ref name=":0">[https://geonames.usgs.gov/pls/gnispublic/f?p=116:3:3243034212291123::NO::P3_FID,P3_TITLE:952187%2CHarbor%20Hill USGS GNIS Detail, Harbor Hill]</ref> Whether Harbor Hill or 401-foot Jayne's Hill to the east was the highest point on Long Island was a point of some debate in the 19th century, with Harbor Hill often thought to be the higher.<ref name="BE1887">{{cite news|title= Questions Answered | newspaper=Brooklyn Daily Eagle | date= October 9, 1887}} (listing Harbor Hill at 384 feet, and Jayne's Hill at 383)</ref><ref>Brooklyn Daily Eagle Almanac, 1890, p.&nbsp;85 (Harbor Hill 384; Jayne's Hill 383)</ref> A news report of 1901 reported that Jayne's Hill was actually taller.<ref name="BE1901">{{cite news | title= Highest Point on Long Island | newspaper=Brooklyn Daily Eagle | date= June 7, 1901}} (reporting that Jayne's Hill is indeed taller)</ref> Nevertheless, the issue remained contested at least as late as 1938.<ref name="funnel">{{cite news | title= Walt. Funnel Stands Up For Jayne's Hill | publisher=The Long Islander | date= Dec 15, 1938}} ("There was really a bit of blood pressure on the subject as advocates pressed their arguments...")</ref>

===Remaining buildings=== [[File:Mackay_Estate_Gate_Lodge_2013-09-29_16-17-22.jpg|thumb|Mackay Estate Gate Lodge]]

Much of the estate, including the site of the main building, has been covered with a modern housing development. However, three remaining buildings from the Harbor Hill estate were listed on the National Register of Historic Places in 1991: the Mackay Estate Dairyman's Cottage, the Mackay Estate Gate Lodge, and the Mackay Estate Water Tower.<ref name="nris">{{NRISref|2009a}}</ref>

==See also== *List of Gilded Age mansions * "Harbor Hill: Portrait of a House" by Richard Guy Wilson.

==References== {{Reflist|30em}}

==External links== {{Commons category|Harbor Hill (mansion)|Harbor Hill}} * {{usurped|1=[https://web.archive.org/web/20040815115733/http://www.mackayhistory.com/HarborHill.html Harbor Hill: An Appreciation]}} * [http://www.vintagedesigns.com/id/mkm/mackay/index.htm Interior of the house, 1903-1904]

{{Gold Coast mansions}} {{Authority control}}

Category:East Hills, New York Category:Mansions of Gold Coast, Long Island Category:Houses in Nassau County, New York Category:Landforms of Nassau County, New York Category:Landforms of Suffolk County, New York Category:Hills of New York (state) Category:Demolished buildings and structures in New York (state) Category:Châteauesque architecture in the United States Category:Gilded Age mansions