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Company: OMA

Established in 1975 and based in Rotterdam, Office for Metropolitan Architecture is headed by Rem Koolhaas. The firm specialises in architecture, urbanism and cultural analysis and has a research studio called AMO.

Pictured above is the CCTV Headquarters in Beijing – two towers that lean towards each other, bridged at the the top and bottom to form a distorted loop.

Locations: Rotterdam, New York, Beijing, Hong Kong, Doha, Dubai and Australia

Number of employees: 200-500