How Istanbul's Duplicate Image Problem Became a Crisis in Plain Sight

Istanbul's municipal archives hold tens of thousands of property and heritage records. A growing share of them contain the same photographs attached to multiple, unrelated files — a structural flaw in the city's digital documentation system that has quietly undermined building permits, earthquake risk assessments, and heritage preservation reviews for at least a decade.

The timing matters. Turkey is still absorbing the administrative lessons of the February 2023 Kahramanmaraş earthquakes, which killed more than 50,000 people and exposed catastrophic failures in building inspection records across dozens of municipalities. Istanbul, sitting atop the North Anatolian Fault, cannot afford a parallel collapse in the integrity of its own property documentation. The duplicate image problem is not a bureaucratic quirk — it is a data reliability question with direct consequences for structural safety decisions.

How the System Broke Down

The roots of the problem go back to the early 2010s, when Istanbul Metropolitan Municipality began a large-scale drive to digitise its paper-based cadastral and heritage records. Consultants brought in under the KENTGES urban transformation framework — a national spatial planning strategy launched in 2010 — scanned millions of documents across districts including Fatih, Beşiktaş, and Üsküdar. The process was fast. Quality control was not.

Staff working at the Fatih District Directorate of Culture and Tourism, which oversees one of the densest concentrations of listed buildings in Europe, reportedly flagged inconsistencies in image metadata as early as 2015, according to internal correspondence later cited in a 2022 audit summary published by the Turkish Court of Accounts. The audit noted irregularities in digital asset management across several Istanbul district administrations without specifying which buildings were affected or quantifying the scope of duplication.

By 2019, the problem had a second layer. Istanbul's BIMTAS — the metropolitan municipality's urban infrastructure and investment company — migrated records to a new integrated GIS platform. During that migration, image files without unique identifiers were assigned generic sequential codes. When duplicate scans existed, the system had no mechanism to flag them; it simply stored both, often linking them to whichever file was most recently updated. Engineers and planners querying the database had no reliable way to know whether the photograph on screen matched the structure in question.

What Changed — and What Didn't

A 2024 directive from the Ministry of Environment, Urbanisation and Climate Change required all metropolitan municipalities to complete a reconciliation audit of digital property records by the end of 2025, specifically to support the national urban transformation programme targeting roughly 1.5 million high-risk buildings nationwide. Istanbul was given a deadline of December 31, 2025.

That deadline passed. Municipal sources have not published a completion report, and the reconciliation audit's status remains unclear from public records available as of this week. The İstanbul Deprem Araştırma Merkezi — the city's earthquake research centre, based in Zeytinburnu — has previously stated that accurate building-level documentation is a precondition for reliable risk modelling in the districts most exposed to fault line activity, including Avcılar and Bakırköy.

Heritage preservation bodies face a parallel exposure. The Boğaziçi İmar Müdürlüğü, which governs development along the Bosphorus shoreline, depends on photographic evidence to adjudicate disputes between developers and conservationists over the condition of listed structures before any modification. If the archive image attached to a file shows a different building entirely, that evidentiary basis collapses.

For residents navigating the system, the practical advice at this point is specific: anyone applying for a building permit, seeking an earthquake risk classification, or challenging a heritage designation in Istanbul should formally request that the municipal office confirm the photographic record attached to their property's file. Under Turkish administrative procedure law, applicants have the right to inspect their own file and contest inaccuracies. District offices in Kadıköy and Şişli have information desks equipped to handle such requests, and the process typically takes between 10 and 30 working days. The longer this correction is deferred, the more decisions — some of them life-safety decisions — rest on images that may show someone else's building entirely.