City Nth was down a lane off Castlereagh St between Hunter & Hoskins place , York was on the gnd floor of the Grace building on York St when it was the Comm. Repat . section ,City South was also in Castlereagh st beside Fire headquarters , Dalley was obviously in Dalley St between George & Pitt . There was also Central which was in the basement of the GPO & a small exchange in the Commonwealth block in Chifley square .Haymarket is down in Parker st Haymarket .
Nth , Sth , York , Central & Chifley are all gone now being replaced by exchanges with heaps more exchange access but in smaller size buildings for their requirements .
Gee I may have just broken the official secrets act letting all of this out for general consumption .