<P> The Citgo sign is a two - sided 60 - foot (18 m) square white sign with the Citgo logo, called the trimark, and the word mark CITGO . The sign advertises the oil company Citgo, which is a subsidiary of Petróleos de Venezuela S.A. The sign features thousands of light - emitting diodes (LEDs) that turn off every night at midnight . The current sign was unveiled in March 2005 after a six - month restoration project . LEDs were selected for their durability, energy efficiency, intensity, and ease of maintenance . On October 15, 2008, a small electrical fire inside the sign caused approximately $5,000 worth of damage, partially melting the plastic and leaving visible smoke damage . The Citgo sign was shut down for several months beginning in July 2010 to replace the LEDs with a newer version hopefully more capable of withstanding the winds and temperature extremes that affect the sign . Earlier versions featured neon lighting; the pre-2005 sign contained 5,878 glass tubes with a total length of more than 5 miles (8.0 km). Service on the sign is provided by Federal Heath Sign Company . </P> <P> The Citgo sign is known nationally for appearing above the Green Monster during televised games of the Boston Red Sox at Fenway Park . The sign has been nicknamed "See It Go," especially when a home run is hit during a game . This visibility has led to the installation of replica signs . Minute Maid Park, home of the Houston Astros, has a replica of the sign behind left field . Replicas of the sign also appear in two minor league baseball ballparks . Hadlock Field, home of the Double - A Portland Sea Dogs in Portland, Maine, has a replica of the Citgo sign above its replica of the Green Monster, the Maine Monster . The Double - A Astros affiliate Corpus Christi Hooks have a 50 - foot (15 m) square replica of the sign at their ballpark, Whataburger Field . The association with Fenway Park and the Red Sox is so strong that some local Little League fields often are decorated with replicas of the Citgo sign . The sign was highlighted in the 1968 short film Go, Go Citgo, a 1983 Life Magazine photograph feature, and the 1989 feature film Field of Dreams . The sign is caricatured in Neal Stephenson's 1984 book The Big U as "the Big Wheel sign," which is worshipped by members of a fictional American Megaversity fraternity . </P> <P> The first sign, featuring the Cities Service green - and - white trefoil logo, was built in 1940 . That sign was replaced with the trimark in 1965 . Although there was, originally, a Cities Service station on the ground floor of the building, there is no associated Citgo gas station, so the sign is now a historical landmark . In 1979, Governor Edward J. King ordered the sign turned off as a symbol of energy conservation . Four years later, Citgo attempted to disassemble the weather - beaten sign and was surprised to be met with widespread public affection for the sign and protest at its threatened removal . The Boston Landmarks Commission ordered its disassembly postponed while the issue was debated . The sign was refurbished and relit by Citgo in 1983, an event that drew a cheering crowd of 1,000 fans of the sign, and has remained in operation ever since . In September 2006, Jerry McDermott, a Boston city councillor, proposed that the sign be removed in response to Venezuelan President Hugo Chávez's insults toward U.S. President George W. Bush . McDermott also suggested draping an American flag or Boston Red Sox banner over the sign until Chávez was out of office . </P> <P> In July 2016, the Boston Landmarks Commission voted to grant preliminary landmark status to the famous sign . The preliminary status prevents the sign from being removed from the building until the commission conducts a three - month study and then will vote on permanent landmark status in October 2016 . In October 2016, the Boston Globe reported that Related Beal purchased the building on which the sign sits as part of a $140 million, nine - building deal . Related Beal agreed on March 15, 2017 to retain the sign for "decades to come". </P>

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