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[withheld] — 20-year accumulated nationwide Chinese real estate transaction and market data: new-home sales area, secondary-home transaction counts, commercial/office transaction value, benchmark-project data, top-10 developer sales revenue, residential land transaction volume, and macro real-estate-investment data — now layered with an AI query/analysis agent ('[withheld] AI') for on-demand market insight generation.. 20 years of continuous data accumulation covering the full real estate industry chain (new-home, secondary, commercial/office, land, devel…