CA Civ Proc Code Section 1250.325

(a)

A defendant may file a disclaimer at any time, whether or not he is in default, and the disclaimer supersedes an answer previously filed by the defendant. The disclaimer need not be in any particular form. It shall contain a statement that the defendant claims no interest in the property or in the compensation that may be awarded. Notwithstanding Section 1250.330, the disclaimer shall be signed by the defendant.

(b)

Subject to subdivision (c), a defendant who has filed a disclaimer has no right to participate in further proceedings or to share in the compensation awarded.

(c)

The court may implement the disclaimer by appropriate orders including, where justified, awarding costs and litigation expenses.