Cal. Sts. & Hy. Code § 5629.1
If bonds are to be issued to represent the security of the unpaid assessments, upon confirmation of the report by the legislative body the superintendent of streets shall give notice to pay by mail and by publication substantially in the manner provided by Sections 4320 and 4321 of this code. The period for payment in cash stated therein shall be 30 days following the date of confirmation of the report. Upon completion of the cash payment period, the superintendent of streets shall file with the county recorder a certificate substantially in the form set out in Section 5626, giving notice therein that interest is payable at a rate to be fixed upon the sale of bonds, which rate shall not exceed the rate permitted for bonds by Section 53531 of the Government Code, and shall begin to run on the 31st day after the confirmation of the report. Thereafter the provisions of Part 5 (commencing with Section 6400) shall be applicable and payments on assessments at bond shall be made as therein provided. The bonds may be issued and sold as the legislative body directs and may be dated at any time after the expiration of the cash payment period.
Ca. Sts. and High. Code § 5629.1