Pick 2 or 3 French cities or districts: median €/m² for apartments and houses, ranges and sample sizes — from notarized DVF sales, not asking prices. The URL updates as you pick: share it.
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Every figure is computed from DVF, the open dataset of property sales recorded at the notary in France, aggregated over the cadastral sections around each zone's centre: three years of sales, medians and P25–P75 ranges, outliers removed. Each compared zone links to its own city or district page, where the method is documented in detail.