The top largest buildings by area can vary depending on the specific criteria used for measuring "size." Here are a few examples of large buildings in terms of total floor area:

New Century Global Center, Chengdu, China: This building has a total floor area of 1.7 million square meters and features a shopping mall, offices, hotels, a water park, and more.

Dubai Mall, Dubai, UAE: The Dubai Mall has a total floor area of 1.1 million square meters and is one of the world's largest shopping centers. It includes over 1,200 retail stores, a cinema complex, and numerous restaurants and attractions.

CentralWorld, Bangkok, Thailand: CentralWorld is a shopping center in Bangkok that has a total floor area of 830,000 square meters. It includes over 500 shops, restaurants, and entertainment venues.

The Venetian and The Palazzo, Las Vegas, USA: This complex of hotels and casinos in Las Vegas has a total floor area of 700,000 square meters. It features over 7,000 rooms, numerous restaurants, theaters, and a convention center.

Abraj Al Bait Clock Tower, Mecca, Saudi Arabia: This building has a total floor area of 1.5 million square meters and features a hotel, shopping mall, and prayer hall.

Again, it's worth noting that the size of a building can be measured in different ways, including total floor area, land area, and volume, so the specific ranking of buildings can differ depending on the criteria used for measurement.
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