Aera Energy covers a large area of California. The state's leading oil and gas producer (accounting for about 25% of California's total production), Aera Energy's properties extend from the Los Angeles Basin in the south to Coalinga in the north. It has daily production of 131,000 barrels of oil and 36 million cu. ft. of natural gas and boasts proved onshore and offshore reserves of about 720 million barrels of oil equivalent. Aera Energy also has interests in real estate operations (in partnership with homebuilder Toll Brothers). The exploration and production company is a joint venture of affiliates of Exxon Mobil (which own 48%) and Royal Dutch Shell (52%).