Hi Kate
For the purposes of determining your non residential tax (and also your IBI), you need to know the cadastral value of your property and land. If you do not have this information then it can be obtained from either your local town hall or the land registry office in Almeria.
If you contact the land registry office for the information you would need to provide then with the 20 digit catastral code for your property. The service is free.
Richard
Richard