The Largest Buildings By Floor Area In The World

When it comes to buildings, the largest is not always the tallest. Some of the world's biggest structures contain more than 20 million square feet of built space. Iran Mall in Tehran leads this list with a reported total floor area of 21 million square feet (1.95 million square meters). The entries below include mixed-use complexes and airport terminals. Major exhibition centers also rank among the largest. Published sources use terms such as gross floor area, built-up area, and total construction area. The ranking below uses the reported building area figure provided by an owner, operator, project participant, or other credible architectural source. Read on to explore some of the largest buildings in the world.

Iran Mall

Located in Tehran, Iran Mall ranks first on this list with a reported total built area of approximately 21 million square feet (1.95 million square meters). The enormous complex opened in 2018 and combines retail space with cultural facilities. Recreational areas also occupy substantial portions of the development. The first completed phase included about 700 shops. Elsewhere, the Jondishapour Library and a cinema complex broaden the mall's uses beyond shopping. The interiors incorporate traditional Persian architectural influences alongside contemporary construction. The complex also contains sporting facilities and extensive parking.

New Century Global Center

New Century Global Center in Chengdu, Sichuan, China, has a gross floor area of approximately 18.94 million square feet (1.76 million square meters). Completed in 2013, it ranks second on this list. The Council on Vertical Urbanism identifies it as the world's largest building by total floor area under its building-specific measurement. The mixed-use complex contains a hotel and extensive shopping areas. Its Ocean Park includes an indoor beach and water park. Visitors can also find an ice rink and cinema within the building, making the development a major entertainment destination as well as a commercial one.

Dubai International Airport Terminal 3 And Concourse B

At more than 18.44 million square feet (1.713 million square meters), Dubai International Airport Terminal 3 and Concourse B rank third on this list. Dubai Aviation Engineering Projects reports that the published floor-space figure includes Terminal 3 and Concourse B. The terminal opened in 2008 as a large multi-level structure with substantial sections below ground. Terminal 3 also contains a baggage-handling system capable of processing 8,000 bags per hour. Dubai Airports describes it as the world's largest and deepest system of its kind. Glass and polished metal feature prominently throughout the passenger areas, while extensive natural light enters the terminal.

Shenzhen World Exhibition & Convention Center, Phase I

Shenzhen World Exhibition & Convention Center is a major project of the Shenzhen Municipal Government in the Guangdong-Hong Kong-Macao Greater Bay Area. Phase I has a built-up area of 17.23 million square feet (1.6005 million square meters). The complex accommodates exhibitions and conferences. It also supports events and commercial activity. The center has 19 indoor exhibition halls. Sixteen are standard halls, while a mega hall and two multifunctional halls complete the indoor facilities. The halls extend along a central corridor, and nearby metro stations provide public transportation access to the complex.

National Exhibition And Convention Center, Shanghai

China's National Exhibition and Convention Center in Shanghai has a total construction area of 15.82 million square feet (1.47 million square meters). Its main building uses a four-leaf-clover-inspired layout, with a commercial plaza at the center and exhibition halls extending outward. The complex also incorporates office facilities and a hotel. The center contains 500,000 square meters of exhibition area, including 400,000 square meters indoors. It is located about 1.5 kilometers from the Hongqiao transportation hub and is connected to Shanghai Hongqiao Railway Station. Hongqiao International Airport is also connected through the surrounding transportation network.

Istanbul Airport Main Terminal

Istanbul Airport's main terminal covers approximately 15.07 million square feet (1.4 million square meters). When it opened in 2018, its architects described it as the world's largest airport terminal under one roof. The vast building accommodates passenger processing areas and retail facilities. Lounges and transportation connections occupy additional sections of the terminal. Istanbul Airport handled 84.44 million passengers in 2025, according to Airports Council International Europe. That made it Europe's second-busiest airport that year, finishing just behind London Heathrow.

Amsterdam Airport Schiphol Terminal

Amsterdam Airport Schiphol reports approximately 14 million square feet (1.3 million square meters) of terminal floor surface area. Schiphol follows a one-terminal concept, allowing passengers to move through a connected terminal system before reaching its piers. The terminal supports one of Europe's busiest international aviation hubs. The airport occupies land that was once beneath Haarlemmer Lake. The lake was drained by 1852, and the first aircraft landed at Schiphol in 1916. Despite more than a century of expansion, the airport has remained at its original site. Schiphol describes itself as the world's oldest airport still occupying the same location.

The Avenues, Kuwait

The Avenues in Kuwait has a built-up area of approximately 13.76 million square feet (1,278,300 square meters). Mabanee, which developed and manages the property, classifies it as a super-regional mall. The complex grew through several stages between 2007 and 2018. The Avenues contains 12 distinct districts and more than 1,100 retail units. Mabanee reports approximately 360,000 square meters of gross leasable area, considerably less than the building's total built-up area. The development combines retail space with dining facilities. Entertainment venues occupy additional sections of the complex.

Aalsmeer Flower Auction

The Aalsmeer Flower Auction in Aalsmeer, Netherlands, occupies approximately 8.42 million square feet (782,599 square meters) under one roof. Guinness World Records recognizes it as the world's largest commercial building by floor area. Later additions connected to the original building are not included in that figure. The building is operated by Royal FloraHolland and is designed for the auctioning, sorting, and distribution of flowers and plants. Around 33 million flowers and plants are sold through the Aalsmeer marketplace each day. Buyers participate in fast-moving auctions before products are prepared for distribution to markets in the Netherlands and abroad.

Massive Floor Areas

Floor area provides a different measure of architectural scale than height. Airports and shopping complexes can extend across enormous areas while remaining relatively low-rise. Based on the reported building-area figures above, Iran Mall leads the ranking at approximately 1.95 million square meters, followed by New Century Global Center at 1.76 million square meters. Due to their sheer size, these buildings are as notable as the businesses and services they contain.