Will / Testament
If you own a property in Spain, we strongly recommend you have a Spanish will in place; it is an expensive and slow process to get your foreign will recognized in Spain. For your heirs to get your property transferred to their names, the process is much simpler if there's a Spanish will. If there is no Spanish will registered at the "Registro de Actos de Ultima Voluntad", then your property could, in the worst case, pass to the local and regional government.
The solicitors at MATA Abogados will draft the document according to your explicit instructions.