Question: What company headquartered in San Ramon, California and third in the Fortune 500 list of the top US closely held and public corporations, owns the Petronius tower?

Context paragraphs:
Rancho San Ramon (Amador): Rancho San Ramon was a 20968 acre Mexican land grant in the southern San Ramon Valley of present-day Contra Costa County, California.  Rancho San Ramon (Pacheco-Castro) was adjacent in the northern San Ramon Valley.

Chevron Corporation: Chevron Corporation () is an American multinational energy corporation.  One of the successor companies of Standard Oil, it is headquartered in San Ramon, California, and active in more than 180 countries.  Chevron is engaged in every aspect of the oil, natural gas, and geothermal energy industries, including hydrocarbon exploration and production; refining, marketing and transport; chemicals manufacturing and sales; and power generation.  Chevron is one of the world's largest oil companies; as of 2014 , it ranked third in the Fortune 500 list of the top US closely held and public corporations and sixteenth on the Fortune Global 500 list of the top 500 corporations worldwide.  It was also one of the Seven Sisters that dominated the global petroleum industry from the mid-1940s to the 1970s.

Lithia Motors: Lithia Motors, Inc. is an American nationwide automotive retailer headquartered in Medford, Oregon.  It is the fourth largest automotive retailer in the United States.  In 2015, Lithia Motors broke into the Fortune 500 list at #482, making it one of only three Oregon-based companies in the Fortune 500.  This followed a year that saw the acquisition of the DCH Auto Group, one of the 10 largest dealer groups in the country, with 27 dealerships, before being purchased by Lithia Motors.  In 2016, Lithia climbed to #346 and that same year made the Fortune 500 List of Top Ten Companies with the biggest Jump in rank on the Fortune 500.  Today, Lithia is ranked #318 on the Fortune 500.  Lithia employs more than 11,100 people in stores across the nation including Alaska and Hawaii.  Lithia operates 160 stores in 18 states.

Rancho San Ramon (Pacheco-Castro): Rancho San Ramon was a 8917 acre Mexican land grant in the northern San Ramon Valley of present-day Contra Costa County, California.  Rancho San Ramon (Amador) was adjacent in the southern San Ramon Valley.

Compliant Tower: A compliant tower (CT) is a fixed rig structure normally used for the offshore production of oil or gas.  The rig consists of narrow, flexible ("compliant") towers and a piled foundation supporting a conventional deck for drilling and production operations.  Compliant towers are designed to sustain significant lateral deflections and forces, and are typically used in water depths ranging from 1,500 to 3,000 feet (450 to 900 m).  At present the deepest is the Chevron Petronius tower in waters 623m deep.

FirstEnergy: FirstEnergy Corporation is a diversified energy company headquartered in Akron, Ohio.  Its subsidiaries and affiliates are involved in the generation, transmission, and distribution of electricity, as well as energy management and other energy-related services.  Its ten electric utility operating companies comprise the United States' largest investor-owned utility, based on serving 6 million customers within a 65000 sqmi area of Ohio, Pennsylvania, West Virginia, Virginia, Maryland, New Jersey and New York.  Its generation subsidiaries control more than 23,000 megawatts of capacity, and its distribution lines span over 194,000 miles.  In 2013, FirstEnergy ranked 181 on the Fortune 500 list of the largest public corporations in America.

Fortune 500: The Fortune 500 is an annual list compiled and published by "Fortune" magazine that ranks 500 of the largest United States corporations by total revenue for their respective fiscal years.  The list includes publicly held companies, along with privately held companies for which revenues are publicly available.  The concept of the Fortune 500 was created by Edgar P. Smith, a "Fortune" editor, and the first list was published in 1955.  The Fortune 500 is more commonly used than its subset Fortune 100 or wider list Fortune 1000.

Forest Home Farms: The Forest Home Farms is a 16 acre municipal historic park located in San Ramon, California.  In 1997, Ruth Quayle Boone bequeathed the land and all buildings on it to the City of San Ramon for use as a park and historical site in memory of her husband, Travis Moore Boone.  After Ruth Boone’s death in 1998 at the age of 94, the City expanded the memorial to include Ruth, in honor of her generosity to the people of San Ramon and in recognition of the contribution women made to agriculture in the San Ramon Valley.

Monte Vista High School (Danville, California): Monte Vista High School is a comprehensive public high school located in Danville, California, United States.  It is a National Blue Ribbon school, as well as a California Distinguished School.  It is fully WASC accredited.  The school is located in the San Ramon Valley, approximately 35 miles east of San Francisco, and is part of the San Ramon Valley Unified School District.  It serves around 2274 students from grades 912.  The principal is Kevin Ahern.  Its primary sports rival is San Ramon Valley High School.  The school mascot is a Mustang.

Dougherty Valley High School: Dougherty Valley High School (commonly Dougherty, Dougherty Valley, Dougherty Valley High, DVHS, or DV High) is a public high school located in the Windemere development of San Ramon, California, United States.  Dougherty is one of four high schools in the San Ramon Valley Unified School District (SRVUSD), along with California High School, San Ramon Valley High School, and Monte Vista High School.  Constructed by Shapell Industries of California and Windemere Ranch Partners BLC, Dougherty was the first developer-built school in the SRVUSD.  The school opened its doors in 2007.

Supporting paragraphs: Compliant Tower Chevron Corporation
Answer: Chevron Corporation