Hi. Don't get too excited, this seems to be the same thing that was done in Gandesa three years ago, we were all, Spanish included asked to go to Basa office with our escrituras on certain days to identify our properties from a photo and told that our houses would be legal and we could apply for services, a few weeks later we were visited by a local policeman and an official from Tarragona who measured the outside of the house, two years later we received a bill and form 902S with the words Vivienda on,back dated three years for council tax.
This seems only there way of getting more money out of us and solely for tax purposes, the Vivienda bit means nothing.
Terry.