Detroit's Digital Archives Are Riddled With Duplicate Images — Here's What the City Is Doing This Week

Detroit's Department of Buildings, Safety Engineering, and Environment confirmed this week that an internal review of the city's digital property records system — used by planners, inspectors, and the public through the Detroit Open Data Portal — turned up thousands of duplicate image files clogging the database. The problem, which city IT staff say has compounded over at least five years of uploads from multiple departments, is now the focus of an emergency cleanup effort that began Tuesday, July 1.

The timing matters. Detroit is in the middle of a $450 million capital improvement cycle, with major redevelopment projects active in Midtown, the East Riverfront, and along the McNichols Road corridor. Planning documents tied to those projects rely on accurate, searchable photo records — everything from inspection photos of condemned structures to before-and-after images tied to demolition grants. When those records are cluttered with duplicate files, staff hours burn on manual sorting rather than actual work.

What the Audit Found

City IT staff presented preliminary findings to the Detroit City Council's Planning and Economic Development standing committee on Wednesday. The audit covered image assets uploaded to the Detroit Open Data Portal and the internal BuildDetroit case management system between January 2020 and June 2026. According to information shared at the committee meeting, duplicate files accounted for a significant share of storage overhead in the BuildDetroit system — an identical or near-identical image uploaded more than once as different inspectors logged the same property visit through separate workflows.

The Detroit Land Bank Authority, which manages more than 40,000 vacant and abandoned properties across the city, uses photo documentation to support blight ticket appeals and court cases. Land Bank staff told the council committee that duplicated records have occasionally surfaced in legal proceedings, creating confusion over which photo timestamp is authoritative. The Land Bank has maintained its own parallel image archive since at least 2018, which city IT says contributed to the duplication cascade when the two systems were partially merged in 2022.

Wayne County's Register of Deeds office, which cross-references some Detroit municipal imagery for deed dispute resolution, flagged the overlap issue in a March 2026 letter to the city's Chief Information Officer. That letter, obtained through a Freedom of Information Act request by a local civic tech group, describes the duplicate problem as affecting properties primarily in ZIP codes 48205, 48206, and 48213 — neighborhoods including Osborn, Virginia Park, and East English Village.

The Cleanup Effort and What Comes Next

The city brought in a contractor — Roper Technologies subsidiary Veritiv Digital Solutions, which holds an existing municipal software services agreement — to run deduplication algorithms across the BuildDetroit image library starting this week. The contract extension authorizing that work, valued at $187,000, cleared the city's purchasing department on June 27. City IT expects the automated pass to eliminate the most obvious duplicates by July 18, after which human reviewers will work through flagged edge cases — images that are nearly identical but not exact matches, such as photos taken seconds apart during the same inspection.

For residents dealing with blight appeals or trying to track demolition activity on their block, the practical upshot is that the Detroit Open Data Portal's property image viewer may show intermittent gaps or placeholder thumbnails through mid-July while files are reorganized. The city's 311 service line confirmed this week that staff are aware of the disruption and are logging calls from residents who notice missing images on properties in the Grandmont-Rosedale and Brightmoor neighborhoods, where active demolition programs are underway.

Longer term, city IT is proposing a rule-based upload filter that would reject duplicate files at the point of submission, rather than cleaning them up after the fact. That proposal goes to the full City Council for a budget amendment vote in September. Advocates for digital transparency, including the Detroit-based civic organization Data Driven Detroit, have pushed for years for better metadata standards on public property records — a fix that would make deduplication easier and reduce the manual burden on already stretched city staff.