Which architectural firm underwent a major rebranding in 2013, changing from 'SOM' to their full name 'Skidmore, Owings & Merrill' to emphasize their heritage and comprehensive design approach?

The architecture industry has seen significant brand mergers and transformations throughout its history. Many of today's most renowned architectural firms have evolved through strategic rebranding, acquisitions, or mergers that fundamentally changed their market position and design philosophy. This trivia question tests your knowledge of significant architectural brand evolutions that shaped today's industry landscape.

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Foster + Partners (previously Foster Associates)
Gensler (previously M. Arthur Gensler Jr. & Associates)
SOM never rebranded to their full name; they actually shortened from 'Skidmore, Owings & Merrill' to just 'SOM' in 2013
HOK (previously Hellmuth, Obata + Kassabaum)