Cal. Gov't Code § 65913.4.5
(a)
(1) A local agency shall issue a building permit for one or more residential units that are part of a housing development project consisting of 10 or fewer units on a lot proposed to be subdivided as part of a subdivision pursuant to paragraph (3) if the applicant for the permit has met both of the following requirements:
(3)
(B) The local agency may require security to ensure faithful performance of the requirements identified in the approved tentative or parcel map or its conditions of approval. The amount of security shall be determined by the local agency and shall not be more than 300 percent of the total estimated cost of the improvements or of the acts to be performed. The security shall be provided in either of the following forms, as determined by the local agency: