Which architectural firm was the first to require ALL of its architects to become LEED Accredited Professionals, creating a major brand differentiator in 2003?

The Leadership in Energy and Environmental Design (LEED) certification system has transformed how architectural firms brand themselves and market their sustainability credentials. This trivia question explores a pivotal moment in architectural brand strategy when LEED certification became a competitive advantage and changed the industry's approach to marketing sustainable design capabilities.

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HOK (Hellmuth, Obata + Kassabaum)
Gensler
Skidmore, Owings & Merrill (SOM)
Perkins&Will