Downtown Las Vegas (commonly abbreviated as DTLV) is the central business district and historic center of Las Vegas, Nevada.
 It is the original townsite and was the gambling district of Las Vegas prior to the Strip, and the area still incorporates downtown gaming.
 As the urban core of the Las Vegas Valley, it features a variety of hotel and business highrises, cultural centers, historical buildings and government institutions, as well as residential and retail developments.
 Downtown is located in the center of the Las Vegas Valley and just north of the Las Vegas Strip, centered on Fremont Street, the Fremont Street Experience and Fremont East.
 The city defines the area as bounded by I-15 on the west, Washington Avenue on the north, Maryland Parkway on the east and Sahara Avenue on the south.
"Downtown Las Vegas Area" is the name assigned by the Nevada Gaming Control Board NGCB which includes the Downtown Las Vegas area casinos and the Stratosphere Tower which is located 2 mi from Fremont Street.
 The city of Las Vegas uses the term Downtown Gaming for the casinos near the Fremont Street Experience.
 The land is part of the 110 acre that were auctioned on May 15, 1905 when the city was founded.
The Nevada Gaming Control Board, also known as the State Gaming Control Board, is a Nevada state governmental agency involved in the regulation of gaming throughout the state, along with the Nevada Gaming Commission.
 It was founded in 1955 by the Nevada Legislature.
The Stratosphere Las Vegas (formerly Vegas World) is a hotel, casino, and tower located on Las Vegas Boulevard just north of the Las Vegas Strip in Las Vegas, Nevada, United States.
Station Casinos is a gaming company based in the Las Vegas suburb of Summerlin, Nevada, founded by Frank Fertitta, Jr. Station Casinos, along with Affinity Gaming, Boyd Gaming, and American Casino & Entertainment Properties, dominate the locals casino market in Las Vegas.
 The company purchased several sites that were gaming-entitled, meaning that major casinos can be built at that location without additional approvals.
 There are only a limited number of such sites available in the Las Vegas area.
 Station has also branched out into managing casinos that they do not own.
 Red Rock Resorts, Inc. () is a publicly traded holding company that owns a portion of Station Casinos.
The Downtown Grand Las Vegas, formerly the Lady Luck Hotel & Casino, is a hotel and casino in Downtown Las Vegas, Nevada, owned by the CIM Group and operated by Fifth Street Gaming.
 The Downtown Grand is the centerpiece of Downtown3rd, a new neighborhood and entertainment district under development in downtown Las Vegas.
The El Cortez, a hotel and casino, is a relatively small downtown Las Vegas gaming venue a block from the Fremont Street Experience and Las Vegas Boulevard.
 The official marketing slogan has been "Where locals come to play" since the El Cortez has traditionally attracted Las Vegas residents weary of large casinos geared towards tourists.
 Slots, table games, and a race and sports book occupy one floor of the main pavilion.
 It is one of the oldest casino-hotel properties in Las Vegas having continuously operated at the same Fremont Street location since 1941.
 Primarily Spanish Colonial Revival in style, it reflects a 1952 remodel when the facade was modernized.
 On February 22, 2013, the structure was placed on the National Register of Historic Places.
Ronald Dale Harris is a computer programmer who worked for the Nevada Gaming Control Board in the early 1990s and was responsible for finding flaws and gaffes in software that runs computerized casino games.
 Harris took advantage of his expertise, reputation and access to source code to illegally modify certain slot machines to pay out large sums of money when a specific sequence and number of coins were inserted.
 From 1993 to 1995, Harris and an accomplice stole thousands of dollars from Las Vegas casinos, accomplishing one of the most successful and undetected scams in casino history.
The Nevada Gaming Commission is a Nevada state governmental agency involved in the regulation of casinos throughout the state, along with the Nevada Gaming Control Board.
 It was founded in 1959 by the Nevada Legislature.
Michael “Roxy” Roxborough (1951) is an American odds maker, syndicated columnist, teacher and author.
 He is best known as founder and owner of Las Vegas Sports Consultants (1982–1999), the international odds making company licensed by the Nevada Gaming Control Board.
 Roxborough is credited with introducing mathematical formulas and computer models to the multi-billion dollar sports wagering industry.
 The Las Vegas Review-Journal listed Roxborough number two in its list of the most influential people in sports of the 20th century.

Question: The Nevada Gaming Control Board assigned the name "Downtown Las Vegas Area" to the area that includes the downtown Las Vegas casinos and the Stratosphere Las Vegas, which used to be called what?
Answer: Vegas World