Editing ARCO (section)

===Headquarters buildings===
[[File:PaulHastingsCityNationalTwinTowers.jpg|thumb|At one time, ARCO had its headquarters in what is now the [[City National Plaza]] complex in [[Downtown Los Angeles]]<ref>{{cite web |url=http://www.arco.com/ |archive-url=https://web.archive.org/web/19980113043324/http://www.arco.com/ |archive-date=1998-01-13 |title=Welcome to ARCO Online |work=ARCO. |access-date=July 7, 2010 |quote=ARCO, 515 South Flower Street, Los Angeles, California 90071-2256 |url-status=dead}}</ref>]]

From 1972 to 2000, ARCO's global corporate headquarters were in the [[ARCO Plaza]] in Los Angeles at the corner of 5th and Flower Streets, the site of [[Richfield Tower|Richfield's former headquarters]]. Upon completion in 1972,<ref name="lat-19721001">{{cite news |url= |title=L.A. Grows Up |newspaper=[[Los Angeles Times]] |date=October 1, 1972 |page=N33 |last=Weaver |first=John D. |quote=The latest additions to L.A.'s urban landscape are the twin 52-story towers of Atlantic Richfield Plaza--a mammoth, $188-million office complex and shopping center that rises on the same square block at Fifth and Flower where the old, gold-spired... |id={{ProQuest|157158798}}}}</ref> the ARCO Plaza towers were the tallest buildings in the city for one year before being overtaken by [[Aon Center (Los Angeles)|Aon Center]], and were the tallest twin towers in the world until the completion of the [[World Trade Center (1973-2001)|World Trade Center]] in [[New York City]]. In 1986, joint owners ARCO and [[Bank of America]] sold the buildings to Shuwa Investments Corp., the American subsidiary of Shuwa Co. of Tokyo, for $650 million while both remained tenants in their respective named towers.<ref name="lat-1986aug05">{{cite news |url=https://www.latimes.com/archives/la-xpm-1986-08-05-fi-1544-story.html |title=Arco, B of A Will Sell Twin Tower Complex in L.A. : Deal With U.S. Unit of Shuwa Co. in Japan Will Give Both Needed Cash |newspaper=[[Los Angeles Times]] |date=August 5, 1986 |first=John M. |last=Broder}}</ref> ARCO moved out of the building in 1999.<ref name="lat-1999jan27">{{cite news |url=https://www.latimes.com/archives/la-xpm-1999-jan-27-fi-2124-story.html |title=Arco Tower to Be Without Its Namesake, Atlantic Richfield, Come March |newspaper=[[Los Angeles Times]] |date=January 27, 1999 |first=Nancy Rivera |last=Brooks}}</ref> The building was renamed [[City National Plaza]] in 2005.<ref>{{cite news |url=http://www.ladowntownnews.com/news/the-two-towerscity-national-bank-to-occupy-arco-plaza/article_c83249bc-5ecd-535b-b24d-7df4550a169f.html |title=The Two TowersCity National Bank to Occupy Arco Plaza |first=Kathryn |last=Maese |date=November 24, 2003 |work=LA Downtown News}}</ref>

ARCO's Oil & Gas division headquarters were in downtown [[Dallas, Texas]].  [[ARCO Tower]], the company's headquarters, was a 46-story office building designed by architect [[I.M. Pei]]. The building is now called [[Energy Plaza]].