question: How many square feet is the shopping mall located in the tallest completed building in Nevada?
answer: 500000
context: Title: The Palazzo
  Passage: 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.
  Title: Allendale Square
  Passage: 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.
  Title: Grand Canal Shoppes
  Passage: 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.
  Title: Al Fardan Residences
  Passage: 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.
  Title: List of tallest buildings in Panama City
  Passage: 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.
citations: Grand Canal Shoppes The Palazzo