1All leasehold land, which immediately before the commencement of this Act, was vested in a first or only mortgagee by way of assignment of a term of years absolute shall, from and after the commencement of this Act, vest in the first or only mortgagee for a term equal to the term assigned by the mortgage, less the last ten days thereof, but subject to a provision for cesser corresponding to the right of redemption which at such commencement was subsisting with respect to the term assigned.