Largest Office Buildings in North America
Overview
These are the largest office buildings in North America - the largest of all is the Pentagon with 620,000m2 of floor area, packed into 7 floors. At 490,000m2, the FCA (Fiat Chrysler Automobiles) US LLC HQ and Technology Center is the second-largest, followed by Place du Portage of Canada at 462,636m2, which accommodates around 10,000 office workers. If you are into North America's tallest offices (instead of the largest), check out our list of the tallest office buildings in North America.
Compare the 7-storey Pentagon with 104-storey One World Trade Center
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Some of the other largest office buildings in North America include:
Desjardins Complex. Located in Montreal, Quebec, Canada, the Desjardins Complex consists of three towers and a hotel (DoubleTree by Hilton Montreal), with a combined floor area of 418,154m2. 
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Compare Desjardins Complex of Montreal with Place Du Portage of Gatineau
Complexe Desjardins by Wikimedia/Jeangagnon under CC-BY-SA 3.0 Unported
Image Attribution: https://commons.wikimedia.org/wiki/User:Jeangagnon
Merchandise Mart. Located in Chicago, Illinois, along the Chicago river, the Merchandise Mart is the 9th largest commercial/office building in the world with 372,000m2 of floor space (4 million sq feet), primarily as a retailing and wholesale destination. 
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Compare Merchandise Mart (retail/wholesale distribution function) with Pentagon (defence function)
Merchandise Mart in Chicago by Wikipedia/Daniel Schwen under CC-BY-SA 4.0 ..
Image Attribution: https://commons.wikimedia.org/wiki/User:Dschwen
Apple Park. With a floor area of 260,000m2 spread over 4 floors, the Apple Park can accomodate up to 12,000 employees. It was designed by renowned architect Norman Foster and completed in 2017. More..
Compare the Apple Park of Cupertino with Comcast Center of Philadelphia
Aerial view of Apple Park - by Wikimedia/Daniel L. Lu under CC-BY-SA 4.0 ..
Image Attribution: https://commons.wikimedia.org/wiki/User:Dllu
Brookfield Place. Brookfield Place is the 3rd largest office building in Canada, with a floor area of 276,110.00m2. Brookfield Place is located in Toronto, Canada, and stands at a height of 261.00 meters (856.30 feet), with a total of 53 floors.
Compare the giants of Toronto - Brookfield Place vs First Canadian Place
Check out the Tallest and Largest Office Buildings
The Pentagon and the largest office buildings in the world
Burj Khalifa and the largest office buildings in the Middle East
Taipei 101 and the largest office buildings in Asia
The largest office buildings in North America
The largest office buildings in the United States
The largest office buildings in Canada
Tallest office buildings in the world
Tallest office buildings in North America
Tallest office buildings in the United States | New York | Chicago
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