California Code, Government Code - GOV § 66453

(a) A local agency may make recommendations concerning proposed subdivisions in any adjoining city, or in any adjoining unincorporated territory for any proposed subdivision within the planning area of the requesting local agency. A local agency wishing to make recommendations concerning proposed subdivisions shall file with the local agency having jurisdiction over the subdivisions a map indicating the territory for which it wishes to make recommendations. The local agency having jurisdiction shall issue a receipt for the territorial map.

(b) Within five days of a tentative map application being determined to be complete pursuant to Section 65943 for a proposed subdivision located, in whole or in part, within the territory outlined on the territorial map, the local agency shall transmit one copy of the proposed tentative map to the requesting local agency.

(c) Within 15 days of receiving a copy of a proposed subdivision map, the requesting local agency may submit recommendations to the local agency having jurisdiction. The local agency having jurisdiction shall consider these recommendations before acting on the tentative map.