Is the increase over the original borrowed amount for purchasing a property, stipulated for the Islamic bank (one million Syrian pounds on a loan of one million four hundred thousand Syrian pounds, for a period of ten years), Islamically permissible?

If the intention behind borrowing from an Islamic bank is Murabaha (cost-plus financing) or Istisna' (manufacturing contract), then there is no objection to it, provided that the bank adheres to the Sharia regulations. However, if the intention is genuinely a loan with a stipulated increase, then it is explicit Riba (usury) and forbidden.