California Code, Government Code - GOV § 53583

(2)(A) If the local agency determines to sell the bonds at public sale, the local agency shall advertise the bonds for sale and invite sealed bids on the bonds by publication of a notice once at least 10 days before the date of the public sale in a newspaper of general circulation circulated within the boundaries of each local agency to be aided by the project to be financed by the issuance of the bonds. If one or more satisfactory bids are received pursuant to the notice, the bonds shall be awarded to the highest responsible bidder. If no bids are received or if the local agency determines that the bids received are not satisfactory as to price or responsibility of the bidders, the local agency may reject all bids received, if any, and either readvertise or sell the bonds at private sale or on a negotiated sale basis.

(B) If the local agency determines to sell the bonds at private sale or on a negotiated sale basis, the local agency shall send a written statement, within two weeks after the bonds are sold, to the California Debt Advisory Commission explaining the reasons why the local agency determined to sell the bonds at private sale or on a negotiated sale basis instead of at public sale.