Originally Posted by bob22
I dont' think they are opposing.
WOuldn't this building would need to be treated like a detached garage circuit fed by a subpanel and with its own ground rod, neutrals isolated from ground in subpanel?
If he installs a subpanel, yes.
A subpanel, in my opinion, is the only viable option, and even that is questionable because of what Jim said. But I'd do that before doing what rjniles suggested.
Then again, if it were me, I'd run a new 60- or 100-amp service to the building, put a subpanel in (isolated neutrals) and drive ground rods.