CA Civ Proc Code Section 426.70

(a)

Notwithstanding subdivision (a) of Section 426.60, this article applies to eminent domain proceedings.

(b)

The related cause of action may be asserted by cross-complaint in an eminent domain proceeding whether or not the party asserting such cause of action has presented a claim in compliance with Part 3 (commencing with Section 900) of Division 3.6 of Title 1 of the Government Code to the plaintiff in the original eminent domain proceeding.