Question: What was Stratosphere Las Vegas located at 2200 South Las Vegas formerly known as? 

Context paragraphs:
Robertson High School: Robertson High School (RHS) is a public senior high school in Las Vegas, New Mexico.  The school is part of the Las Vegas City Schools District in former East Las Vegas.  The building dates from about 1945, when it was known as Las Vegas High School.  The school was renamed Las Vegas Robertson High School in 1958, after the old Las Vegas High School burned down and a new building was constructed.  W. J. Robertson had been the Superintendent of the Las Vegas City Schools since 1941 when he suffered a fatal heart attack on November 26, 1956 at the age of 55.  Mr. Robertson, born in Kansas on November 3, 1901 also served as Principal at Las Vegas High School for many years prior.  The colors of RHS are red and white, their mascot is the Cardinal.  The enrollment currently stands at 607.

American Casino &amp; Entertainment Properties: American Casino & Entertainment Properties (ACEP) is a casino holding company headquartered at the Stratosphere Las Vegas.  ACEP was a wholly owned subsidiary of American Real Estate Partners before it was sold to Whitehall Street Real Estate Funds, an investment arm of Goldman Sachs, in February 2008.  The company owns the following 4 casinos: Aquarius Casino Resort, Arizona Charlie's Decatur, Arizona Charlie's Boulder, and Stratosphere Las Vegas.

SkyJump Las Vegas: SkyJump Las Vegas holds the Guinness World Record for highest commercial decelerator descent with an official height of 829 ft and is located at Stratosphere Las Vegas.  As part of its grand opening event, Las Vegas Mayor Oscar Goodman presented a written proclamation deeming April 20, 2010 as SkyJump Day in Las Vegas.

Las Vegas Strip: The Las Vegas Strip is a stretch of South Las Vegas Boulevard in Clark County, Nevada, known for its concentration of resort hotels and casinos.  The Strip is approximately 4.2 mi in length, located immediately south of the Las Vegas city limits in the unincorporated towns of Paradise and Winchester.  However, the Strip is often referred to as being in Las Vegas.  Most of the Strip has been designated an All-American Road, and is considered a scenic route at night.

Stratosphere Las Vegas: 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.

Holy Cow Casino and Brewery: Holy Cow!  Casino and Brewery (formerly Foxy's Firehouse) was a locals casino and microbrewery on South Las Vegas Boulevard, north of the Las Vegas Strip, in Las Vegas, Nevada.  The property began in 1955 as Foxy's Deli, which operated until its closure in 1975.  A year later, the building was reopened as a casino named Foxy's Firehouse, which later closed in 1988.  Tom "Big Dog" Wiesner purchased the building and reopened it as the Holy Cow casino in 1992.  Wiesner added a microbrewery the following year, making the Holy Cow the first brewery to open in Las Vegas.  Wiesner persuaded the state to change its laws that had prohibited breweries from operating in Las Vegas.

Bonanza Gift Shop: Bonanza Gift Shop is a landmark located on the Las Vegas Strip between the SLS Las Vegas and the Stratosphere Las Vegas.  It is billed as the "World's Largest Gift Shop" with over 40000 sqft of shopping space.

Nevada State Museum, Las Vegas: The Nevada State Museum, Las Vegas located at the Springs Preserve, in Las Vegas, Nevada is one of 7 Nevada State Museums operated by the Nevada Department of Tourism and Cultural Affairs.  The name was changed from the Nevada State Museum and Historical Society in 2008 when the museum moved from Lorenzi Park in Las Vegas to the Springs Preserve campus.  The museum houses items from the development of Las Vegas as well as the natural history of the area.  The museum is open Tuesday through Sunday, 9 am to 5 pm, closed Thanksgiving and Christmas.

List of tallest buildings in Las Vegas: The city of Las Vegas, Nevada and its surrounding unincorporated communities in the Las Vegas Valley are the sites of more than 160 high-rises, 42 of which stand taller than 400 ft .  The tallest structure in the city is the Stratosphere Tower, which rises 1149 ft just north of the Las Vegas Strip.  The tower is also the tallest observation tower in the United States.  Since the Stratosphere Tower is not fully habitable, however, it is not considered a building.  The tallest building in Las Vegas is the Fontainebleau Resort Las Vegas, which rises 735 ft and was topped out in November 2008.  This building, however, is currently on hold.  The tallest completed building in the city is the 52-story Palazzo, which rises 642 ft and was completed in 2007.

Aztec Inn: Aztec Inn (also known as the Aztec Gold Inn & Casino) is a motel and casino located on 0.89 acres of land at 2200 South Las Vegas Boulevard, north of the Las Vegas Strip, in Las Vegas, Nevada.  The property is located south of the Stratosphere hotel-casino, and includes a nearby apartment complex connected to the Aztec Inn.

Supporting paragraphs: Aztec Inn Stratosphere Las Vegas
Answer: formerly Vegas World)