CA Rev & Tax Code Section 1643

(a)

The panel of hearing officers shall conduct the hearing and receive evidence to determine (1) if the property concerned is unitary and (2) if it is unitary, the value of the unitary property as a whole and the portion thereof allocable to each county. The panel shall prepare a summary report of the proceedings, and make a recommendation concerning the total value of the entire unitary property and the apportionment of that value among the counties concerned. Any determination by a majority of the hearing officers shall constitute a determination by the panel.

(b)

If the panel determines that the property concerned is not unitary, the application shall be referred back to each of the counties concerned to be treated as an application for reduction of assessment filed in each county.