23 E Mill Rd | Washington Twp.

$799,000 | 7 Beds | 4 Baths (4 Full) | 5,400 Sq. Ft.

Welcome to The Old Fort, an irreplaceable historic estate offering a rare chance to own a piece of New Jersey's past with modern-day flexibility. Set on 1.68 private acres in the highly sought-after German Valley Historic District of Long Valley, this circa 1774 stone residence stands as one of the area's most distinctive and storied homes. Properties of this caliber and authenticity seldom come to market. From its commanding presence and timeless stone construction to its thoughtfully expanded 19th-century design, the home delivers a level of character and permanence that cannot be recreated. Inside, the residence offers spacious, functional living while preserving its historic charm thick stone walls, original details, and a layout that blends warmth, privacy, and versatility. The property also includes a separate 2-bedroom, 1-bath dwelling, currently vacant, presenting immediate potential for rental income, guest quarters, or a private work-from-home setup. Surrounded by natural beauty yet conveniently located near major routes, this property offers a unique combination of privacy, land, and long-term value. Whether you are seeking a primary residence, weekend retreat, or a one-of-a-kind investment, The Old Fort represents a true legacy purchase. Opportunities like this are limited, and once sold, rarely become available again. GSMLS 4022273

Directions to property: in the heart of Long Valley's German Valley Historic District

MLS Listing ID: 
GSMLS 4022273
Listing Status
Status of the Listing.
Listing Status: 
Active
Listing Status (Local): 
Active
Listing Status Accepting Offers: 
1
Building Details
Details about the building on a property.
Architectural Style: 
Victorian
Year Built: 
1774
New Construction: 
0
Living Area: 
5,400
Basement: 
Unfinished
Fireplaces: 
Yes
Construction
Roof: 
Asphalt Shingle
Exterior: 
Stone
Exterior Features: 
Carriage House
Energy Information: 
Electric
Porch: 
No
Deck: 
No
Room Details
Details about the rooms in the building.
Total Rooms: 
15
Total Bedrooms: 
7
Total Bathrooms: 
4
Total Full-Bathrooms: 
4
Total Half-Bathrooms: 
0
In-Law Suite 
Utilities
Information about utilities available on the property.
Heating System: 
2 Units, Radiators - Hot Water
Heating System Fuel: 
Oil Tank Above Ground - Inside
Cooling System: 
See Remarks
Water Source: 
Public Water
Sewer: 
Public Sewer
Lot/Land Details
Details about the lots and land features included on the property.
Acres: 
1.68
Lot Size (Dimensions): 
1.680 AC
Waterfront: 
0
Lot Features
Driveway: 
Blacktop
Parking Type: 
Blacktop
Total Parking Spaces: 
4
Garage: 
Detached Garage, Garage Parking
Fence: 
No
Public Record
Parcel Number: 
2338-00035-0000-00019-0000-
Lot Number: 
19
Annual Tax: 
$18,075.00
Listing Dates
Dates involved in the transaction.
Listing Entry Date/Time: 
4/21/2026
Contract Details
Details about the listing contract.
Possession: 
ASAP
Listing Participants
Participants (agents, offices, etc.) in the transaction.
Listing Office Name: 
NEW AND MODERN GROUP