Get physical building characteristics for a DVF transaction from the BDNB national building database.
Returns: construction year, number of units, number of floors, wall material, roof material,
primary usage, and median price/m² from BDNB's pre-2022 DVF aggregate stats.
REQUIRED: transaction_id (DVF transaction ID — get this from the "id" field in search_property_transactions results)
Match method: spatial proximity (nearest BDNB building within 200m).
Returns null + refunds credits if no building found within 200m.
Workflow: call search_property_transactions first → use an "id" from the results as transaction_id here.
Example:
transaction_id: "12345678" → { building: { annee_construction: 1967, nb_logements: 48, mat_mur: "beton", ... } }
Cost: 2 credits
ConnectorAPI key