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Property and assessment in California

Assessed values, parcels and assessment appeals.

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Property taxation, recorded documents and zoning involve different agencies.

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10 reviewed links · San Mateo

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San Mateo, California

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Parcel maps and property-information resources (opens in a new tab)

County directory for its Property Maps portal and the Treasurer-Tax Collector’s separate property-tax lookup. The map portal provides Assessor and recorded maps, including parcel and subdivision maps.

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San Mateo County official service / referred provider · San Mateo — property query (opens in a new tab)

County property lookup — Parcel maps and property-information resources

The Property Maps portal allows you to download Assessor’s maps or Recorded maps such as subdivision maps and parcel maps online for free.

Agent source review: October 15, 2026 · Snapshot a76ea00e485d2028

Assessment appeal — new county portal and Clerk contact (opens in a new tab)

San Mateo County directs appeal information, online applications, status checks, hearing schedules and forms to its new portal.

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San Mateo County · San Mateo — assessment appeals information (opens in a new tab)

Assessment appeals — Assessment appeal — new county portal and Clerk contact

If you have immediate questions, you can still reach the AAB Clerk via email at AAB@smcgov.org or by telephone at (650) 363-4573.

Agent source review: October 15, 2026 · Snapshot d467ff7f874d90a7

Assessment appeal applications, case status and forms (opens in a new tab)

County-referred portal for filing, tracking appeals and obtaining forms.

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San Mateo County · San Mateo — assessment appeals information (opens in a new tab)

Assessment appeals — Assessment appeal applications, case status and forms

new secure online portal where you can find information about the Assessment Appeals process, submit applications online, check the status of your appeal, find hearing schedules and download forms.

Agent source review: October 15, 2026 · Snapshot d467ff7f874d90a7

Homeowners’ exemption: state guidance and local assessor filing (opens in a new tab)

Shared California state guidance. Follow the official programme conditions and the responsible county’s instructions; this entry does not establish individual eligibility or confirm an active local auction.

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California State Board of Equalization · Homeowners exemption (opens in a new tab)

Homeowners’ exemption: state guidance and local assessor filing

To claim the exemption, the homeowner must make a one-time filing with the county assessor where the property is located. The claim form, BOE-266, Claim for Homeowners' Property Tax Exemption, is available from the county assessor.

Agent source review: October 26, 2026 · Snapshot 79662b9866706681

Proposition 19: transfer rules and filing checklists (opens in a new tab)

Shared California state guidance. Follow the official programme conditions and the responsible county’s instructions; this entry does not establish individual eligibility or confirm an active local auction.

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California State Board of Equalization · Proposition 19 (opens in a new tab)

Proposition 19: transfer rules and filing checklists

Proposition 19 – The Home Protection for Seniors, Severely Disabled, Families, and Victims of Wildfire or Natural Disasters Act

Agent source review: October 26, 2026 · Snapshot 4947db3f55d8ab99

Supplemental assessments and separate tax bills (opens in a new tab)

Shared California state guidance. Follow the official programme conditions and the responsible county’s instructions; this entry does not establish individual eligibility or confirm an active local auction.

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California State Board of Equalization · Supplemental assessments (opens in a new tab)

Supplemental assessments and separate tax bills

The supplemental roll provides a mechanism for placing property subject to Proposition 13 reappraisals due to change in ownership or completed new construction into immediate effect. Changes in ownership or completed new construction are referred to as 'supplemental events' and result in supplemental tax bills that are in addition to the annual property tax bill.

Agent source review: October 26, 2026 · Snapshot 76813228503f6709

Parcel/Assessor Maps (opens in a new tab)

Officially linked county property-map resource. This verifies the referral and stated label; interactive layers, parcel results, legal boundaries, buildability and application eligibility are not determined here.

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San Mateo County · San Mateo County — assessor recorder clerk (opens in a new tab)

Official property-office map referral: Parcel/Assessor Maps

Parcel/Assessor Maps

Agent source review: October 26, 2026 · Snapshot 6530b17fc894cd34

County GIS & Maps (opens in a new tab)

Officially linked county property-map resource. This verifies the referral and stated label; interactive layers, parcel results, legal boundaries, buildability and application eligibility are not determined here.

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San Mateo County · San Mateo — building permit department (opens in a new tab)

Official property-office map referral: County GIS & Maps

County GIS & Maps

Agent source review: October 26, 2026 · Snapshot 99e6105a669d05d3

Official state service profiles

These 0 profiles are classified under this topic by California’s official state service directory. The county filter above does not establish local eligibility for them. Confirm availability and requirements on the official profile.

No state-directory profiles mapped to this topic. This does not mean no state service exists.