Have a look at this page: https://www.spanishpropertyinsight.com/spanish_property_solutions_legal.htm
Roma Bosch of DiG Advocats is based in Barcelona and can help you – it’s an easy drive to Tortosa. However if you really do want a lawyer based more locally then I can thoroughly recommend a lawyer called Esther Capafons. She is based in Cambrils, not far from Tortosa. I have been very impressed by her.
Her contact details are:
Sra. Esther Capafons i Guillemat
Capafons & Associats
Address: Paseo La Salle 27, Bajos43850 Cambrils, Tarragona,
Tel: +34 977 368 073