A USGBC study found that over 7.9 million jobs will be created by 2013 to support LEED and green building. Many California cities and counties, as well as federal departments and agencies, mandate LEED Silver certification for new construction. Additionally, around a third of LEED-certified commercial buildings in the Sacramento region are privately owned, and developers are using sustainability and LEED certification as a marketing tool to attract tenants in the competitive real estate market.