How Boston's Property Records Ended Up Riddled With Duplicate Images — And What the City Is Now Trying to Fix

Boston's Assessing Department is working through a backlog of thousands of property records that contain mismatched or duplicated photographs — images tied to the wrong parcels, in some cases for more than a decade — after a review launched in early 2025 identified the scope of a problem that had quietly compounded across multiple administrations. The issue surfaced publicly during budget hearings at City Hall last spring, when councillors questioned why assessment appeals in Roxbury and East Boston were being delayed.

The timing matters. Mayor Michelle Wu's office has made housing production and equitable property assessment central planks of her agenda, and errors in the parcel database directly affect how assessors calculate valuations. A misidentified image — say, a triple-decker on Walk Hill Street in Jamaica Plain filed under a Dorchester parcel — can push an assessed value in the wrong direction, triggering incorrect tax bills or muddying the record when homeowners file abatement claims.

How the Errors Accumulated

The roots of the problem stretch back to the early 2000s, when the city contracted out a mass digitisation effort to move paper property cards into the CAMA — Computer Assisted Mass Appraisal — system then in use. Scanners working under time pressure ingested tens of thousands of images, and batch-upload errors introduced duplicate files that were mapped to incorrect parcel identification numbers. Each subsequent database migration — the city moved to a new assessing platform around 2014 and again undertook partial system upgrades after 2020 — carried the errors forward rather than correcting them.

The Boston Landmarks Commission and the city's own GIS office flagged inconsistencies in parcel imagery as far back as 2018, particularly in dense, rapidly changing neighbourhoods like the South End and Chinatown, where lot splits and condo conversions made keeping image records current especially difficult. But a formal audit was never commissioned, and the problem remained a known-but-unaddressed item on the Assessing Department's internal list.

The Massachusetts Department of Revenue sets certification standards that Boston's assessment rolls must meet every three years. The most recent recertification cycle, completed in 2024, passed — but assessors flagged image-record integrity as an area needing improvement, according to the department's public certification documentation. That finding gave the Wu administration a formal trigger to act.

What the Fix Actually Looks Like

The Assessing Department began a structured duplicate-image replacement program in February 2025, working ward by ward from the outer neighbourhoods inward. Field inspectors with tablets are re-photographing flagged parcels and uploading images through a new verification workflow that cross-checks the parcel ID against the GIS street-address layer before the file is committed to the database. Ward 18 — covering Mattapan and parts of Hyde Park — was completed first. Ward 11, which covers most of Jamaica Plain including the Egleston Square corridor, is currently in progress.

The Boston residents most directly affected are property owners who have active abatement applications or who refinanced recently and encountered discrepancies during title review. Greater Boston Legal Services, which handles housing cases for low-income clients across Suffolk County, has seen a small but consistent stream of assessment-related inquiries linked to image mismatches, particularly from clients in Roxbury's Dudley Street corridor. The organisation has been directing affected residents to file a written correction request through the Assessing Department's online portal, a process the department says typically takes 30 to 45 business days to resolve.

The full sweep of all 178,000-plus taxable parcels in Boston is not expected to be complete before the fiscal year 2028 assessment cycle. That means property owners in neighbourhoods not yet reached by the field teams are still carrying potentially flawed image records. The practical advice from housing advocates is straightforward: pull your property's assessing record through the city's Assessing Online tool, available at boston.gov, and compare the photo shown against your actual address. If the image is obviously wrong — a parking lot where your house should be, or a commercial building attached to your residential parcel — file the correction request now rather than waiting for inspectors to reach your ward. Errors caught before the preliminary tax bill in January carry far less procedural burden to fix than those that surface after the fiscal year closes.