The top 5 largest buildings in the world by floor area are:

1. New Century Global Center (Chengdu, China): Completed in 2013, this massive structure has a floor area of 1.7 million square meters (18.1 million square feet). It houses a shopping mall, offices, hotels, a water park, and an ice-skating rink, among other attractions.
2. Dubai International Airport Terminal 3 (Dubai, United Arab Emirates): With a floor area of 1.71 million square meters (18.4 million square feet), Terminal 3 at Dubai International Airport is one of the largest airport terminals in the world.
3. Abraj Al Bait (Mecca, Saudi Arabia): This hotel and residential complex, located near the Masjid al-Haram in Mecca, has a total floor area of 1.5 million square meters (16.1 million square feet). It includes the Makkah Royal Clock Tower, which is one of the tallest buildings in the world.
4. CentralWorld (Bangkok, Thailand): CentralWorld is a large shopping plaza and complex in Bangkok, covering a floor area of 830,000 square meters (8.9 million square feet). It features a range of retail outlets, restaurants, and entertainment options.
5. Aalsmeer Flower Auction (Aalsmeer, Netherlands): This enormous flower auction facility has a floor area of 518,000 square meters (5.6 million square feet). It is the largest flower auction in the world and plays a significant role in the global flower trade.
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