William Sydney Mount House
Added to the National Register in 1966, and a National Historic Landmark.

The record
| Register name | Mount, William Sydney, House |
| Property type | Building |
| Address | Gould Rd. and NY 25, Stony Brook, NY |
| County | Suffolk County |
| Listed | Oct 15, 1966 |
| Listed for | Art |
| Level of significance | National |
| Reference number | 66000575 |
| Designations | National Historic Landmark |
The nomination form, the document that argues why this place matters, is in the National Archives: Read the nomination ↗
Visiting
| Address | Gould Rd. and NY 25, Stony Brook, NY |
| Coordinates | 40.9074° N, 73.1383° W · Directions ↗ |
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Reference
Questions people ask
When was William Sydney Mount House listed on the National Register?
Oct 15, 1966. It is also a National Historic Landmark, the higher of the two designations.
Source: National Park Service
Where is William Sydney Mount House?
Gould Rd. and NY 25, Stony Brook, Suffolk County, New York.
Source: National Park Service
Where is the nomination form for William Sydney Mount House?
The National Archives holds the nomination form, the document that made the case for listing.
Source: National Archives
Sources
Name, location, type and dates come from the National Register office's spreadsheet of listed properties, because the Park Service's spatial data does not carry this listing. The map point comes from Wikidata. Construction date, architect, style, photograph and encyclopedia link come from Wikidata and Wikimedia Commons, matched on reference number 66000575. Nothing here is transcribed by hand. The nomination form and photographs ↗ at NPGallery are the original nomination as filed with the National Park Service, and the form is often the best description of the place.