Do you advertise properties?
IGEDD is part of the government. As such, it does not advertise properties, nor does it sell or purchase any property or property-linked service.
IGEDD limits itself here to bringing to the public aggregated information about the property market.
To English page : Property Market in France since 1200
To English FAQs
to French home page "Le marché immobilier depuis 1200"
To French FAQs
About the "tunnel" (in English)