On second thought cgw...if the building you are working in has a true Fire Wall separating the structures, they are considered separate buildings and each would need its own grounding electrode system. You would still need to BOND the water pipe system in the 2nd building. (if it were metal)
The fact that you have 2 services to the building must have been allowed because of Fire Wall separation?
I say you are allowed to ground to the water pipe in the 2nd building but not required. Better ask the AHJ what he thinks also.
