Patterson, George Washington, Ranch-Ardenwood
Why it's listed
Ardenwood is a 131-acre district in Fremont that preserves the heart of a once vast ranch founded by George W. Patterson, a Forty-Niner who began ranching in Alameda County about 1851. At its center is the Patterson House, begun around 1856 as a small two-story redwood farmhouse and enlarged over time. A large Queen Anne addition of 1883 more than doubled its size, adding a corner tower, a horseshoe-arched entrance, decorative shingles and a colored glass and stucco frieze. Another wing followed about 1910-1914. Around the house stand six historic outbuildings, including a sandstone milk house, barns and a garage, along with a quarter-mile driveway lined with walnut and oak trees and a wide variety of planted specimens. By 1878 Patterson was the county's largest landholder, and the ranch employed many laborers, mostly Chinese. The surviving complex shows how a rural family home and farm grew over about sixty years, and it is considered one of the finest ranch complexes of its period in the county.
Significance in brief: Ardenwood is what remains of one of Alameda County's largest ranching operations and illustrates 19th and 20th century rural life and the Patterson family's influence. The house grew through additions in 1883 and ca. 1910-1914, and its 1883 Queen Anne addition is a major example of the style. The house, outbuildings and landscape form a cohesive, intact ranch complex that is one of few of its kind in the county.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 85003043, listed November 29, 1985. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence medium).
Key facts
| Address | 34600 Newark Blvd., Fremont |
|---|---|
| County | Alameda County |
| Listed | November 29, 1985 |
| Reference number | 85003043 |
| Resource type | District |
| Period of significance | 1800-1899, 1900- (specific dates ca. 1856, 1883, 1914) |
| Architect / builder | George W. Patterson & James Hawley |
| Architectural style | Queen Anne (1883 addition) |
| Areas of significance | Agriculture, Architecture |
| Level of significance | Local |
| Status (as stated in the nomination) | House in good condition and partially occupied; planned to become a house museum run by the East Bay Regional Park District. Termite and dry rot problems noted; some landscape and pool features in poor condition. |
| Acreage | 131 |
| Coordinates | 37.55644, -122.05122 (NPS GIS) |
What listing means for this property
This is a historic district. Buildings within its boundary are either contributing (they add to the district's significance) or non-contributing. Owners of contributing income-producing buildings can claim the 20% federal rehabilitation tax credit; homeowners should look at state credits. National Register districts impose no design review by themselves; a local historic district ordinance, if one exists, does (the difference explained).
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 85003043.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q4787978
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.