Sonoma, CA

Sonoma League for Historic Preservation

EIN 23-7358957

Arts, Culture & Heritage Cultural Heritage & Traditions

Mission

The mission of the Sonoma League for Historical Preservation is to preserve Sonoma's historical structures, landscapes, public spaces, and natural resources through education, advocacy, and public recognition, while contributing to Sonoma's unique sense of place.

IRS-recognized 501(c)(3) public charity Contributions are tax-deductible

Claim this page Visit www.preservesonoma.org

About Sonoma League for Historic Preservation

The Sonoma League for Historic Preservation is a nonprofit, donor-facing organization founded to protect and promote the historic buildings, landscapes, and cultural heritage of the City of Sonoma and Sonoma Valley. The League operates the Maysonnave House as its Heritage Center and manages an archive of maps, documents, news clippings and photographs to support research, tours, and education.

In recent years the League has continued active preservation work and public programming: maintaining and publishing its Sonoma/Valley of the Moon historic survey online, offering walking-tour resources and docent-led programs at the Maysonnave House, and serving as an advocacy voice in local planning and preservation reviews. The organization sustains operations through membership, grants, donations and revenue from renting the Maysonnave House and garden for events, and it continues to steward facade easements and awards programs that recognize local preservation leadership.

The League is a long-established 501(c)(3) organization (EIN 23-7358957) with up-to-date filings and an active web presence; its recent activity demonstrates ongoing operations, community engagement, and stewardship of physical and documentary historic resources.

Notable achievements

Restoration and Long-term Stewardship of Maysonnave House

Secured a long-term lease from the City of Sonoma and completed restoration of the Maysonnave House; the property now serves as the League’s Heritage Center, houses the League’s archives, and is used as a community event venue to support the organization's programs.

Historic Survey & Inventory

Established and maintained the Sonoma/Valley of the Moon historic survey ( begun in 1977 and updated since ), now accessible online, providing a comprehensive inventory used for research, planning, and local preservation decision-making.

Historic Facade Easement Program

Operates a deeded facade easement program that has protected the exteriors of multiple iconic Plaza-area buildings, helping preserve the historic character of Sonoma’s downtown core.

At a glance

Total assets: $738K
Annual revenue: $39K
Tax status: 501(c)(3)Public charity
EIN: 23-7358957
Location: Sonoma, CA
Website: www.preservesonoma.org
On Mahalo since: May 2026

Financial figures from the IRS Business Master File, the IRS’s registry of tax-exempt organizations.

Recognition

Operates as a recognized 501(c)(3) nonprofit organization with current public tax filings and nonprofit database listings, confirming tax-exempt status and public accountability.

Maintains an ongoing partnership with the City of Sonoma through the Maysonnave House lease and collaborates with local preservation partners on surveys, advocacy, and planning matters.

Featured in local media and community histories for its multi-decade role in conserving Sonoma’s historic resources and for public programs such as walking tours, awards, and educational events.

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