If you want to buy a property in Spain or if you do have any fiscal activity over here you need to have following documentation:
N.I.E. Number (Número de identificación de extranjeros): Foreigners Tax Identification Number
Residencia (Certificado de Residencia): If you spend more than 183 days in Spain you need to get registered as a permant resident.
Empadronamiento Town Hall Registration: This is required in conjunction with the application for you resident certificate depending on the on the town hall where you reside.
Costa Blanca Weather
Clear (41 oF • 5 oC) Humidity: 45% Wind: NW at 9 mph