Following our exclusive interview with Rem Koolhaas last month, Dutch office OMA is the fifteenth entry to our A-Zdvent calendar of architects. Koolhaas' firm recently completed De Rotterdam, a 44-storey group of interconnected glass towers in the architect's home city, and has also built two skyscrapers in China - the Shenzhen Stock Exchange (pictured) and the CCTV Headquarters building in Beijing.
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