Istanbul's Urban Archive Crisis: This Week's Push to Fix Thousands of Duplicate and Missing Property Images

Istanbul Metropolitan Municipality's digital urban data directorate confirmed this week that an internal audit of the city's GIS-linked building registry identified more than 14,000 duplicate image files attached to property records — some structures carrying up to six identical façade photographs while neighbouring lots in high-risk districts show blank entries entirely. The problem, which administrators have been quietly cataloguing since January, surfaced publicly after district offices in Kadıköy and Fatih reported that automated permit-processing software was rejecting applications because the image validation step could not distinguish between duplicate records and genuine multi-parcel entries.

The timing is not incidental. Istanbul sits on active fault lines, and the February 2023 Kahramanmaraş earthquakes — which killed more than 53,000 people across southern Turkey — drove an accelerated push to reassess structural vulnerability in the city's older neighbourhoods. That reassessment depends heavily on accurate, up-to-date photographic documentation of buildings. When the registry is clogged with duplicate images or missing them altogether, inspectors cannot complete remote triage, forcing slower and more expensive on-site visits.

Where the Problem Is Worst

The heaviest concentrations of duplicate entries appear in Beyoğlu and Zeytinburnu, two districts that combine dense historic building stock with rapid informal renovation. Zeytinburnu, in particular, has been a focus of the municipality's urban transformation program — known locally as kentsel dönüşüm — since the district was flagged as a priority seismic-risk zone years before the Kahramanmaraş disaster. Residents applying for renovation grants under the Housing Development Administration of Turkey, known as TOKİ, have found their applications stalled because the registry sometimes attaches photos of an entirely different building on the same street to their address record.

The Fatih district's municipal sub-office, located near Aksaray, has been fielding complaints since at least April. Staff there have been manually cross-referencing paper land registry records held at the Tapu ve Kadastro Genel Müdürlüğü — the national land-title authority — against the digital entries to identify which image set belongs to which parcel. It is painstaking work. According to municipal documents circulating among district offices this week, Fatih alone accounts for roughly 2,300 of the flagged duplicate records.

What the Municipality Says It Is Doing

The metropolitan authority launched a dedicated deduplication working group on June 30, drawing staff from its İstanbul Planlama Ajansı — the Istanbul Planning Agency, or İPA — and from the city's smart-city technology unit, which operates out of the Sütlüce campus on the Golden Horn. The group is using perceptual hashing software to compare image files algorithmically, a technique that can flag near-identical photographs even when file names differ. Officials have set an internal target of clearing the backlog in Beyoğlu and Zeytinburnu by the end of August, ahead of the autumn permit-processing peak.

The financial stakes are real. Building permit fees in Istanbul range from roughly 50 Turkish lira per square metre for minor renovations to several hundred lira per square metre for new construction, and delayed approvals push contractors into costly extensions. With the lira's ongoing depreciation — the currency has lost substantial purchasing power since 2021 — construction costs have risen sharply, making permit delays even less tolerable for smaller developers and private homeowners trying to bring older buildings up to earthquake code.

For residents in affected districts, the practical advice from municipal offices this week is straightforward: if a permit application has been returned with an image-validation error, applicants should visit the relevant district office in person with a printed copy of the Tapu deed and request a manual record-linkage review. The İPA has also opened an online complaint form — accessible through the municipality's main portal — specifically for duplicate-registry issues, with a stated response time of ten working days. That window may stretch, given the scale of the backlog, but officials say manual overrides for seismic-assessment cases are being prioritised above standard permit requests.