Third, the parties agreed that the duration of this fifteen year mortgage (15) start of its history, and that will continue until fully repaying the loan value.
Third, the parties agreed that the duration of the mortgage fifteen years (15) starting from its history, and that will continue until full repayment of the aforementioned loan value.
The parties agreed that the term of the mortgage for fifteen years (15) starting from today, and will continue until the full payment of the loan amount above.