Which architectural landmark is credited with pioneering the concept of 'architecture as brand' that fundamentally changed how architectural firms market their projects worldwide?

In the competitive world of architecture, marketing innovation can transform an ordinary building into a global icon. One particular structure revolutionized how architectural firms market their designs, becoming a case study taught in architecture schools worldwide. This poll tests your knowledge of architectural marketing history and how certain buildings have redefined industry promotion strategies. Can you identify which famous structure sparked a paradigm shift in architectural marketing?

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The Guggenheim Museum Bilbao (Frank Gehry's 1997 titanium masterpiece that generated the term 'The Bilbao Effect')
The Burj Khalifa (SOM's 2010 Dubai skyscraper that marketed itself as the world's tallest building)
The Sydney Opera House (Jørn Utzon's 1973 expressionist design that became Australia's architectural symbol)
The Seagram Building (Mies van der Rohe's 1958 minimalist tower that defined corporate modernism)