Is it permissible to take a loan from a bank by mortgaging a friend's property in exchange for an annual 10% interest payment on the loan amount to the friend?

It is permissible to mortgage a leased property if the rental value is known. The mortgagor must own the usufruct, even if not the property itself. This is valid with the permission of the original owner (lessor). It is recommended for the mortgagor to inform the lessor and the mortgagee of the amount, type, and duration of the debt to avoid uncertainty (gharar).