1All land, which immediately before the commencement of this Act, was vested in a first or only mortgagee for an estate in fee simple in possession, whether legal or equitable, shall, from and after the commencement of this Act, vest in the first or only mortgagee for a term of three thousand years from such commencement, without impeachment of waste, but subject to a provision for cesser corresponding to the right of redemption which, at such commencement, was subsisting with respect to the fee simple.