The developer and/or agent should be able to assist you in obtaining a mortgage as they will often have contacts with one of the leading Moroccan banks.
In Saidia town there are a number of banks - Arab Bank Morocco, Banque Commerciale du Maroc,
Banque Populaire du Maroc (also have a branch in Paddington, London)
Banque Marocaine du Commerce Exterieur (BMCE), Credit du Maroc and Wafabank.
I also understand that Societe Generale will be taking space in the commercial centre. I am buying through Superior Group and they are arranging the mortgages through SocGen.