I have written a tax article in conjunction with Pellicer and Heredia which will be appearing in December's TIM - it is primarily explaining tax rules for property owning Non-Residents and their need to make a tax return. I also mention that the Spanish tax authorities are sending letters out to property owners who have not paid tax - looking for explanations.
I see today one of the local papers is carrying the same advice - and saying the letters are now on their way to these people.
They are not circulars and action will need to be taken - if you receive one and don't know what to do Contact Pellicer and Heredia on 965 480 737 mention you are a TIM reader and they will help you to sort your issues out, before you risk embargoes and or big fines.
See their advert on the TIM front cover.