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How to get real apartment transaction prices in Poland via API (official RCN data)
Since 13 February 2026 the Polish Real Estate Price Register ( Rejestr Cen Nieruchomości , RCN) is free and public. Every notarial deed of a property sale ends up there: the price, the floor area, the number of rooms, the floor, primary or secondary market and the location. For anyone analysing the…