For sale

$39,500,000

258 Horsemill Rd, Water Mill, NY 11976

7beds

9,400sqft

Single Family Residence

Built in 2009

6.76 Acres Lot

$36,324,900 Zestimate^®

$4,202/sqft

$-- HOA

What's special

Modern luxuryPrivate dockGracious entertaining spacesCovered porchesHeated gunite poolTimeless craftsmanshipSweeping bay-to-ocean views

Broad western sky views from this legacy estate in Water Mill reimagined for today's lifestyle. A once-in-a-generation waterfront estate, Listowel spans 6.9 private acres with 360 feet of Mecox Bay frontage, surrounded by centuries-old farmland. This exceptional 12,000-square-foot shingle-style residence blends timeless craftsmanship with modern luxury. With completely renovated and transformed interiors and a more sensible floor plan featuring gracious entertaining spaces, a dramatic library and exquisite primary suite. Magnificent English gardens, covered porches, a waterside dining porch, a heated gunite pool, orchard, carriage house with studio office suite, private dock, permitted 3 bedrooms guest house, and sweeping bay-to-ocean views complete one of the Hamptons' most extraordinary and enduring legacy properties.

2 days
1,589
118

Facts & features

Interior

Bedrooms & bathrooms

Bedrooms: 7
Bathrooms: 8
Full bathrooms: 7
1/2 bathrooms: 1

Cooling

Central Air

Features

Basement: Yes
Has fireplace: Yes

Interior area

Total structure area: 9,400
Total interior livable area: 9,400 sqft

Property

Parking

Parking features: GarageDetached
Has garage: Yes

Features

Stories: 2
Has private pool: Yes
Pool features: Heated
Has view: Yes
View description: Water
Has water view: Yes
Water view: Water
Waterfront features: Waterfront
Frontage type: Waterfront

Lot

Size: 6.76 Acres

Details

Parcel number: 0900116000100009016

Construction

Type & style

Home type: SingleFamily
Property subtype: Single Family Residence

Condition

New construction: No
Year built: 2009

Community & HOA

Community

Features: Room for a Tennis Court

Location

Region: Water Mill

Financial & listing details

Price per square foot: $4,202/sqft
Tax assessed value: $26,673,700
Date on market: 9/9/2026
Lease term: Contact For Details

Estimated market value

$36,324,900

$29.79M - $44.32M

Not available

Price history

Date	Event	Price
9/9/2026	Listed for sale	$39,500,000+41.1%$4,202/sqft
Source: Out East #397681 Report a problem
6/15/2021	Sold	$28,000,000-5.1%$2,979/sqft
Source: Agent Provided Report a problem
8/12/2020	Listing removed	$29,500,000$3,138/sqft
Source: Douglas Elliman #H100918 Report a problem
7/2/2020	Listed for sale	$29,500,000$3,138/sqft
Source: Douglas Elliman #H100918 Report a problem
1/1/2020	Listing removed	$29,500,000$3,138/sqft
Source: The Corcoran Group #54376 Report a problem
5/18/2019	Price change	$29,500,000-7.8%$3,138/sqft
Source: The Corcoran Group #54376 Report a problem
3/6/2018	Price change	$32,000,000-17.9%$3,404/sqft
Source: Corcoran Group #54376 Report a problem
3/17/2017	Listed for sale	$39,000,000+212%$4,149/sqft
Source: The Corcoran Group #54376 Report a problem
8/19/2004	Sold	$12,500,000$1,330/sqft
Source: Public Record Report a problem

Public tax history

Year	Property taxes	Tax assessment
2025	--	$26,673,700
2024	--	$26,673,700
2023	--	$26,673,700
2022	--	$26,673,700
2021	--	$26,673,700
2020	--	$26,673,700
2019	--	$26,673,700 +101.2%
2018	--	$13,256,800
2017	$58,325	$13,256,800
2016	--	$13,256,800
2015	--	$13,256,800
2014	--	$13,256,800
2013	--	$13,256,800
2012	--	$13,256,800
2011	--	$13,256,800 +43.4%
2007	$38,210 -3.6%	$9,242,200 +22.7%
2005	$39,641 +92.7%	$7,530,067 +12362.9%
2003	$20,567 +43.5%	$60,420 +39.4%
2002	$14,336	$43,352