Apartment Building Re-Pipe Cost Question

[Tyrone Vaughan]

I'm looking to do a cold water re-pipe, probably coppper type L, for a 66 unit apartment building in southern CA.  I'm not going to need anyone to do wall work/patching, I have my own guys for that.  Its all one bedrooms (one kitchen sink, one bathroom sink, one shower/bath combo).  I'm wondering if anyone could give me a ballpark cost (total and/or per unit) on what it would cost for the job before I go out and start getting quotes.  Any info would be appreciated.  

Thanks.