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?
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.
American Tower Corporation American Tower Corporation is a publicly held company, owner and operator of wireless and broadcast communications infrastructure in several countries. American Tower is headquartered in Boston, Massachusetts and has local offices worldwide. The company was formed in 1995 as a unit of American Radio Systems, and was spun off from that company in 1998 when that company merged with CBS Corporation. Following the merger, American Tower began international expansion by establishing operations in Mexico in 1998 and Brazil in 1999. The company is structured as a real estate investment trust.