San Francisco's Property Records Are Riddled With Duplicate Images — and Homeowners Are Paying the Price

Thousands of San Francisco property records contain duplicate or mismatched images — the same photograph filed under multiple addresses, or photos that show entirely the wrong building — and the error is cascading through real estate transactions, permit applications, and tax appeal hearings across the city.

The problem sits at the intersection of two forces that have been reshaping San Francisco simultaneously: a housing production push that the Board of Supervisors accelerated under its 2023 Housing Element mandate, requiring the city to plan for roughly 82,000 new units by 2031, and a parallel digitisation drive that moved decades of paper records into online systems without adequate quality checks. When assessors, permit clerks, and title companies pull a property image to verify a building's condition or configuration, they are sometimes looking at a photograph of a structure on the other side of the city.

What Goes Wrong — and Where

The practical consequences land hardest in neighbourhoods where property turnover is high and renovation activity is dense. In the Mission District, where the Planning Department processed a surge of accessory dwelling unit applications through 2024 and 2025, contractors and homeowners have reported receiving permit correspondence that references images inconsistent with their address. The San Francisco Assessor-Recorder's Office, which maintains the city's parcel database, uses building photographs as one input when calculating assessed values — meaning a duplicate image that shows a larger or more improved structure than actually exists can trigger an inflated assessment that takes months to challenge.

The City of San Francisco's Office of Assessor-Recorder uses a system called CAMA — Computer Assisted Mass Appraisal — to process the approximately 215,000 parcels on the city's rolls. When image metadata is incorrectly tagged during batch uploads, a single clerical error can propagate across dozens of linked records. Title companies operating on Montgomery Street have flagged the issue internally when preparing preliminary reports for escrow closings, because a mismatched property image can delay lender approval and, in the worst cases, require a physical re-inspection before a sale can close.

For renters and tenants the stakes are different but equally real. In the Tenderloin, where the Mayor's Office of Housing and Community Development administers several affordable housing programs including the Small Sites Program, building condition photographs form part of the documentation that determines whether a property qualifies for acquisition funding. An incorrect image in the record — even one filed in good faith — can complicate an application review and slow down acquisitions that advocates say are urgent given continued displacement pressure on low-income households.

Who Is Working on a Fix

DataSF, the city's open data office housed within the Controller's Office, has a standing mandate to improve dataset quality across municipal systems, and staff there have been aware of image integrity issues in parcel data for at least 18 months, according to public working-group notes posted to the DataSF website. A formal remediation project has not yet been publicly scheduled or budgeted as of July 4, 2026.

The San Francisco Association of Realtors, which represents agents operating throughout the city including in Noe Valley, the Sunset, and SoMa, has encouraged its members to cross-reference Assessor images against Google Street View and independent photographs before submitting listing materials or entering appeals. That workaround costs agents time — and costs sellers money when closings are delayed.

Residents who believe a duplicate or incorrect image is affecting their assessed value have a formal remedy: a written appeal to the Assessment Appeals Board, which meets at City Hall in Room 405. The filing deadline for 2025–2026 assessment year appeals is September 15, 2026. The fee for filing is $60 per parcel. Homeowners who have already received their annual notice and spotted a discrepancy between the assessed description and their actual property should request a parcel data review directly from the Assessor-Recorder's Office at the Van Ness Avenue counter before filing a formal appeal, which can resolve straightforward image errors more quickly than the appeals calendar typically allows.

The city has not announced funding for a comprehensive audit of its image database. Until that changes, the burden of catching errors remains, largely, on the residents those records are supposed to serve.