Freddie Mac has begun offering a securitization option that allows lenders, on a negotiated basis, to lower their minimum servicing fee from the traditional 25 basis points to 12.5 bps. Doug Robinson, a Freddie Mac spokesman, said the new MBS prefixes, L0 and L4, are “a negotiated product” not available for every seller servicer. “Some lenders have been asking for this change for a while,” he said. Robinson declined to reveal which Freddie customers will…