Grounding rod for town homes? Separate rods or bond them?

[jaggedben]

...In addition, the diagram shows services located on each end on the wall of the end units- he can't have another units service there as that wall legally belongs to that unit.

Well, the NEC doesn't care about that. Also property owners could have easements for their services to be on the adjacent properties. But yes, almost certainly there are other legal agreements or local ordinances that would come into play.