Cal. RTC § 863

If any state assessee or his agent willfully conceals, fails to disclose, removes, transfers, or misrepresents state-assessed property in order to evade taxation and this action results in state-assessed property escaping assessment, or if any state assessee or his agent through fraudulent act or fraudulent omission or through collusion between the state assessee or his agent and the board, its officers, or employees causes any state-assessed property to escape assessment, a penalty shall be imposed as follows:

(a) Insofar as values escaping assessment are part of the unit value, 25 percent of the additional unit assessed value shall be added to the unallocated unit assessment.

(b) Insofar as the values escaping assessment relate to the assessment of nonunitary property, 25 percent of the additional assessment shall be added to the nonunitary assessment.