The Green Zone Technical Update involved amendments to the Los Angeles County Code Title 22 (Planning and Zoning). The Project introduced minor, non-substantive revisions to the Green Zones Ordinance, improving clarity and usability while establishing the Green Zone (-GZ) Combining Zone as a replacement for the previous Green Zone Districts designation.

The Technical Update included a zone change program that applies the -GZ Combining Zone to industrially zoned parcels subject to existing Green Zones regulations in the unincorporated communities of West Carson and West Whittier–Los Nietos. The Los Angeles County Board of Supervisors adopted the Green Zone Technical Update on September 19, 2023, which became effective on October 19, 2023