I believe it is still in the IPC for industrial
Ask the BO for an exception
Not sure if this is the reference you are looking for:
2010 California Plumbing Code Section 412.5.2 and 412.5.3.
It doesn't say separate building, but it does say "centrally located". That may be interpretable (is interpretable a word?).
As Handler said, it applies to B and M only.