Interestingly, despite claiming on their website to be "a fully registered property estate agency for Spanish Property sales in Tortosa and the surrounding areas of the beautiful COSTA DORADA" My Spanish Home doesn't actually provide that number.

Checking on the Agencia de l'Habitatge de Catalunya I couldn't find them either: http://www.agenciahabitatge.cat/wps/portal?WCM_GLOBAL_CONTEXT=ca/ahc/web/serveis/registreAgents/cercadorAgentsRegistrats#

I'm sure there's a reasonable explanation as all estate agents MUST register with that agency. Failure to register would leave MySpanishHome wide open to customer complaints to:

Servei Territorial de Terres de l'Ebre

Carrer Maria Rosa Molas, 41
(accés per Passeig Joan Moreira)
43500 Tortosa
Telèfon 977 92 35 98

From what I understand (I'm not a lawyer) from reading the relevant legislation, there ¡s a fine of 6000 to 12000 euros for those who work as estate agents without registering.

See article 124, 2a and 2b: http://www20.gencat.cat/portal/site/portaldogc/menuitem.c973d2fc58aa0083e4492d92b0c0e1a0/?vgnextoid=485946a6e5dfe210VgnVCM1000000b0c1e0aRCRD&appInstanceName=default&action=fitxa&documentId=473076