Marin foreclosure & tax-auction buying guide

County tax auctions: where to bid

Published auction service: Public Surplus. Start with the Tax Collector’s official page and follow the event it identifies.

Marin Finance: tax-defaulted land public auctions Public Surplus: County of Marin Tax Sale

Resource check · October 19, 2026

Marin’s public-auction page identifies Public Surplus, says no auction is currently scheduled, and includes a March 2024 property list. It also shows a February 2025 update date. Confirm current plans with Finance; the old list is not live inventory.

The county says these public auctions are online, without a live auction venue. Use the Marin Tax Sale seller page rather than general county surplus equipment listings.

Marin also describes sealed-bid sales for certain parcels. An adjacent-owner opportunity or a sealed bid has its own eligibility and submission instructions; do not treat it as an open internet auction.

New to this process? Read how tax-deed auctions work and why a tax-default record does not establish an active sale.

Mortgage foreclosures: follow the trustee’s notice

For a private trustee sale in Marin, the individual Notice of Trustee’s Sale identifies the venue, trustee and sale-information contact. The county’s tax-auction platform and Recorder office are separate resources; neither is a universal place to bid on mortgage foreclosures.

Match the APN and legal description, identify the loan being foreclosed, then confirm the current status using the trustee file number. Ask about qualification and payment before traveling or arranging funds. Use the foreclosure-auction guide to research lien priority and the purchase process.

Marin Recorder: official recorded-document resources

The Marin research checklist

Marin: zoning and Countywide Plan lookup

First determine city versus unincorporated county

Use Marin’s jurisdiction lookup, then contact the responsible planning department. The county planning tools concern unincorporated areas; a parcel within a city needs that city’s review.

A parcel map is not a zoning determination

Marin’s Assessor explains that zoning designations are not shown on assessor parcel maps. Use the zoning lookup separately, and ask about the intended use rather than assuming a residential-looking neighborhood establishes buildability.

Underwrite access and infrastructure

For a hillside or undeveloped parcel, ask about recorded access, topography, utilities, septic where relevant and the work required to reach a usable building site. A road visible beside the land does not establish a legal right to use it.

If the notice names the Sheriff

Use the Sheriff’s civil-enforcement resources and the full sale notice. Verify the legal process, interest being offered, venue and payment terms with the selling office. An office page without a visible auction list leaves current availability unknown.

Marin Sheriff: Civil Services

Read the separate sheriff and court-sale guide before applying trustee-sale assumptions.

Before you commit money

Confirm the current lot or trustee case, the actual interest offered and any status changes.
Have title and legal questions resolved for this parcel and sale.
Price condition, access, occupancy, insurance and your intended use.
Verify qualification, cleared funds, all settlement charges and payment deadlines.

Use the first-bid preparation guide to build a budget and a written maximum bid. Our property pages preserve source events; they are a starting point for this work, rather than a county-certified live sale calendar.

Go to the original sources

Use the current notice and sale terms for a specific purchase. These guides explain the research process; a title professional or attorney can evaluate the rights and obligations in your transaction.

Research reviewed October 19, 2026. Sale dates, availability, procedures and laws can change.