Cal. CCP § 405.33

In proceedings under this chapter, the court shall order that the notice be expunged if the court finds that the real property claim has probable validity, but adequate relief can be secured to the claimant by the giving of an undertaking. The expungement order shall be conditioned upon the giving of the undertaking of such nature and in such amount as will indemnify the claimant for all damages proximately resulting from the expungement which the claimant may incur if the claimant prevails upon the real property claim. In its order conditionally expunging the notice, the court shall set a return date for the moving party to show fulfillment of the condition, and if the moving party fails to show fulfillment of the condition on the return day, the court shall deny the motion to expunge without further notice or hearing. Recovery may be had on the undertaking pursuant to Section 996.440.

For purposes only of determining under this section whether the giving of an undertaking will secure adequate relief to the claimant, the presumption of Section 3387 of the Civil Code that real property is unique shall not apply, except in the case of real property improved with a single-family dwelling which the claimant intends to occupy.