Description: The Prime Industrial Lands layer identifies employment areas that support export-oriented base sector activities such as warehouse distribution, heavy or light manufacturing, and research and development uses. These areas are part of even larger areas that provide a significant benefit to the regional economy, and meet General Plan goals and objectives to encourage a strong economic base in accordance with General Plan criteria. regional economy and meet General Plan goals and objectives to encourage a strong economic base. For more information on Prime Industrial Lands policies, visit the Economic Prosperity Element of the General Plan, at http://www.sandiego.gov/planning/genplan/.