I need to have an old foundation in a rental house repaired and repointed.  This is the interior foundation from the basement.  The height of the foundation wall is about about 5 feet of stone and then 3 feet of brick.  The old lime based mortar is deteriorating— stone needs repointing and some of the brick has fallen out and needs to be redone.  My research leads me to believe that a specific mortar needs to be used, as the stone and antique brick are not as strong as modern day products/construction.  Can anyone with experience chime in and lend some advice?  Also if anyone knows a good mason that does this kind of work I’d appreciate the recommendation.  Property is in Haverhill, MA.  Thanks.