How Istanbul's Building Stock Ended Up Full of Duplicate Images — and What Happens When No One Notices

Istanbul's property documentation problem didn't arrive overnight. It grew slowly, layer by layer, through three decades of accelerating construction, a succession of amnesty laws for unlicensed buildings, and a digitisation drive that converted paper cadastral records into databases without the staff or budget to check whether the photographs attached to each entry were actually the right ones. By mid-2026, the result is a municipal archive riddled with duplicate images — the same photograph appearing under dozens of different cadastral parcel numbers, sometimes across entirely separate districts.

The timing matters. Turkey's Housing Development Administration, TOKI, oversaw the construction of hundreds of apartment blocks in Istanbul after the 2023 Kahramanmaraş earthquakes triggered a nationwide push to demolish and replace vulnerable building stock. That programme moved fast, and speed created paperwork gaps. Properties in districts like Bağcılar and Küçükçekmece — where urban transformation contracts were signed in bulk — entered the central registry with placeholder photographs that were never replaced with site-specific images.

A Problem Rooted in the Urban Transformation Rush

The Tapu ve Kadastro Genel Müdürlüğü, the General Directorate of Land Registry and Cadastre, has been managing a rolling digitisation effort since at least 2015. But critics inside the urban planning community have pointed out for years that image verification was never built into the workflow. When a parcel record was transferred from paper to screen, a photograph was attached — sometimes sourced from a satellite snapshot, sometimes from a field officer's visit, and sometimes, in practice, copied from a neighbouring entry because the original file was missing.

In Fikirtepe, a district in Kadıköy that has been under near-continuous demolition and reconstruction since 2012, the problem is especially visible to anyone trying to cross-reference registry photographs with current street conditions. Buildings that were torn down years ago still appear as standing structures in some digital records because the images were never updated. An estate agent working on Bağdat Caddesi or in the Ataşehir finance district has no formal obligation to flag discrepancies between registry images and the physical property — so most don't.

The Istanbul Metropolitan Municipality's urban information system, known as UKOME in its transport dimension but mirrored for planning under the broader IBB GIS infrastructure, does maintain a separate photographic layer. But it does not automatically sync with the national cadastral database, which falls under central government authority rather than the CHP-led municipal administration. That jurisdictional split has made coordinated correction slow and politically complicated.

What the Data Reveals

Turkey's Court of Accounts, the Sayıştay, flagged irregularities in cadastral record integrity in its 2024 annual report on land registry operations, noting that a sample audit of parcel records in high-turnover urban transformation zones found image-to-parcel mismatches at rates that warranted a systematic review. The directorate was given a correction deadline. That deadline passed in early 2026, and a follow-up review is understood to be ongoing, though no public results have been published as of July 4, 2026.

For ordinary residents, the consequences range from inconvenient to costly. A buyer completing a purchase in Sarıyer or Başakşehir who relies on registry images to verify a property's condition before signing a sales contract may be looking at a photograph of a building on the other side of the city. Legal disputes over whether a vendor misrepresented a property's state have begun citing duplicate image discrepancies as contributory factors, according to property law practitioners active in Istanbul courts.

The practical advice from conveyancing professionals currently working the Istanbul market is consistent: do not rely on the cadastral image as a substitute for a physical site inspection, request the full parcel history rather than the current record snapshot, and cross-check against the IBB's own GIS portal before signing anything. Buyers in urban transformation zones — especially in Avcılar, Sultangazi and Zeytinburnu, all of which carry elevated seismic risk designations — face the most exposure. Until the Sayıştay review produces a public correction report, the duplicate image problem will keep compounding with every new building that enters the registry without verified photography attached.