D.C. Code § 42-810: Mortgagee may redeem prior mortgage; prior mortgage may not bar.

If it so happen there be more than 1 mortgage at the same time made, by any person or persons to any person or persons, of the same lands and tenements, the several late or under mortgagees, his, her, or their heirs, executors, administrators, or assigns, shall have power to redeem any former mortgage or mortgages, upon payment of the principal debt, interest, and costs of suit, to the prior mortgagee or mortgagees, his, her, or their heirs, executors, administrators, or assigns; anything therein contained to the contrary thereof in anywise notwithstanding.