Question: How many square feet is the shopping mall located in the tallest completed building in Nevada?

Context paragraphs:
The Palazzo: The Palazzo is a luxury hotel and casino resort located on the Las Vegas Strip in Paradise, Nevada.  It is the tallest completed building in Nevada.  Designed by the Dallas based HKS, Inc., the hotel offers luxury in an Italian Renaissance ambiance.  The hotel and casino are part of a larger complex (operated as one hotel) comprising the adjoining Venetian Resort and Casino and the Sands Convention Center, all of which are owned and operated by the Las Vegas Sands Corporation.

List of tallest buildings in Panama City: This list of tallest buildings in Panama City ranks skyscrapers in Panama City, by height.  The tallest completed building in Panama City is Trump Ocean Club International Hotel and Tower, which stands 284.4 m tall.  For several years, Panama City's skyline remained largely unchanged, with only four buildings exceeding 150 m (492 feet).  Beginning in the early 2000s, the city experienced a large construction boom, with new buildings rising up all over the city.  The boom continues today, with over 150 highrises under construction and several supertall buildings planned for construction.

Al Fardan Residences: Al Fardan Residences, also known as the Barjeel Tower and the Wind Tower, is a 64 storey residential skyscraper in West Bay, Doha, Qatar.  At 254 metres (830 feet), it is the third tallest completed building in Doha.  Each of the storeys is 4.1 metres (13.5 feet), each built with 94 "SKE 50 automatic climbers", in a 3 to 4-day cycle.  Construction began in 2006 and was completed in 2009.

Grand Canal Shoppes: The Grand Canal Shoppes is a 500000 sqft upscale shopping mall inside The Venetian Hotel & Casino and The Palazzo on the Las Vegas Strip in Paradise, Nevada.

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.

List of tallest buildings in Indianapolis: This list of tallest buildings in Indianapolis ranks skyscrapers and high-rises in the U.S. city of Indianapolis, Indiana, by height.  Majority of the skyscrapers are located in Downtown Indianapolis.  The tallest building in the city is the 49-story SalesforceTower, which rises 811 ft and was completed in 1990.  The structure is the tallest completed building in the state and the 49th-tallest building in the U.S. In addition, it is the tallest building in the Midwest outside of Chicago and Cleveland.  The city's second tallest structure is the OneAmerica Tower, which was the tallest building in Indiana from 1982 until 1990.  Of the 40 tallest buildings in Indiana, 34 are located in Indianapolis.

List of tallest buildings in Beijing: This list of tallest buildings in Beijing ranks skyscrapers in Beijing, the capital city of the People's Republic of China, by height.  The tallest completed building in Beijing is currently the 81-storey China World Trade Centre Tower III at 330 m tall.  The second-tallest building in the city is the Fortune Plaza Office Building 1, which stands 260 m tall with 63 stories.  and the third-tallest is the Park Hyatt Tower, standing at 250 m , also containing 63 stories.  The Park Tower is the tallest building out of the three-building Beijing Yintai Centre, which includes two adjoining 186 m , 42-storey skyscrapers.

Allendale Square: Allendale Square is a 32-storey skyscraper in Perth, Western Australia.  When opened in 1976, the 132 m building surpassed the AMP Building to become the tallest completed building in Perth, a title which it only held until 1977 when St Martins Tower opened.

Guangzhou CTF Finance Centre: The Guangzhou Chow Tai Fook Finance Centre (also called East Tower) is a 1,739 ft tall mixed-use skyscraper in the southern Chinese city of Guangzhou, which was completed in October 2016.  It is the tallest completed building in Guangzhou, the third-tallest in China, and the seventh-tallest in the world.  The Guangzhou CTF Finance Centre has a total of 111 above ground and five below ground floors and houses a shopping mall, offices, apartments, and a hotel.  The skyscraper has a gross floor area of 5,464,633 sqft , of which a little over twenty percent is not part of the skyscraper itself, but of the podium connected to it.

List of tallest buildings in Mexico: This list of tallest buildings in Mexico ranks skyscrapers in Mexico by height.  The tallest completed building is 244 m Torre Reforma in Mexico City.  At 279.5 m , currently topped-out Torre KOI in San Pedro Garza García will become the tallest building in Mexico upon its competition in 2017.

Supporting paragraphs: Grand Canal Shoppes The Palazzo
Answer: 500000