We are in the process of importing both buildings and addresses of the cadastre throughout Spain. I think it would intersect with what you want to do and it would be good to join forces. Here you have more import of the import and how it is done: https://wiki.openstreetmap.org/wiki/ES:Catastro_espa%C3%B1ol/Importaci%C3%B3n_de_edificios
A greeting. -- Jorge Sanz Sanfructuoso - Sanchi Blog http://jorgesanz.es/
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