Is it Islamically permissible to mortgage an orphan's house for a bank loan with interest?

This transaction is not permissible in Islamic law because it involves dealing with an interest-based institution founded on usury, and it explicitly contains usury and interest-bearing loans. As for mortgaging a jointly owned home or other property with the consent of the partners, there is no objection to it if it is part of a permissible transaction free from usury. However, if the transaction is unlawful, mortgaging is not permissible, even with the partners' consent.