William Floyd House
Listed as “Floyd, William, House” · Also known as Old Mastic House; Floyd,William,Estate
Many listed buildings are private homes. Please enjoy them from the street.
About William Floyd House
William Floyd House, at 20 Washington Ave., was added to the National Register of Historic Places on Oct 15, 1980. It was among the first 5 of Brookhaven’s 51 listings. The Register lists it for its agriculture, military, politics and architecture, at the national level. It describes its style as Georgian Revival, as it does for 63 other New York listings. The listing covers 611 acres.
What it isHistoric house in New York, United States. From Wikidata (CC0). Read about it on Wikipedia ↗
PDFRead the original nominationThe form that put it on the Register, with its history, photos and a map · 81 MB · National Archives↗Finding William Floyd House
20 Washington Ave., Brookhaven
No other Register listing is within a short walk. The nearest are under Around it.
1 more Register listing within 2 miles
★ National Historic Landmark · D district · B building · S site. Each opens its own page.
Georgian Revival style, nearby
Other National Register listings within 25 miles described as Georgian Revival.
Memories of William Floyd House
The record says what it is. Neighbors know what it means.
Your answer becomes a post in Town Square.
Questions about William Floyd House
Is William Floyd House on the National Register of Historic Places?
Yes. It was added on Oct 15, 1980 (Register number 71000066).
Is William Floyd House a National Historic Landmark?
No. It is on the National Register; New York has 273 National Historic Landmarks. The nearest is MODESTY (Sloop), 14.7 miles away.
Can you visit William Floyd House?
Our record doesn’t say whether it is open to visitors. Many listed buildings are private, so it may only be seen from the street.
Where can I read the history of William Floyd House?
In its National Register nomination, the form that put it on the Register: a 81 MB PDF at the National Archives, linked on this page.
Sources: National Park Service, National Register of Historic Places (05/22/2026) · National Archives catalog record 75322112 · Wikidata. Map tiles © OpenStreetMap contributors.