Some info. about the "nota simple":

Once you have obtained this information, you must ask for a "Nota Simple" (a Land Registry Report), from the Ayuntamiento to find out what the "normativas" (laws and guidelines for building and development) are on this particular piece of land. The Nota Simple is probably the single most important document you can obtain when developing the land- stray from it and you could receive an order to remove any modifications you made to the land.