Which groundbreaking building project first incorporated a 'double skin façade' as a product design innovation for natural ventilation and temperature regulation, becoming a model for sustainable architecture worldwide?

Sustainable design has revolutionized the architecture industry over the past few decades. As environmental concerns grow, architects increasingly incorporate eco-friendly materials, energy-efficient systems, and biophilic design principles. This poll tests your knowledge about a landmark sustainable building project that changed how product design in architecture approaches environmental challenges. Can you identify the pioneering structure that set new standards?

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Commerzbank Tower (Frankfurt, 1997) - Foster + Partners
The Edge (Amsterdam, 2014) - PLP Architecture
30 St Mary Axe/The Gherkin (London, 2003) - Foster + Partners
One Central Park (Sydney, 2013) - Ateliers Jean Nouvel