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Two major New York architecture firms join forces

CannonDesign agrees to buy Ennead, known for its public projects
Ennead Architects, behind projects such as The David H. Koch Center for Cancer Care at Memorial Sloan Kettering in Manhattan, is joining forces with CannonDesign. (Ennead Architects)
Ennead Architects, behind projects such as The David H. Koch Center for Cancer Care at Memorial Sloan Kettering in Manhattan, is joining forces with CannonDesign. (Ennead Architects)
CoStar News
April 22, 2026 | 9:48 P.M.

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CannonDesign, a 1,600-person global design firm, is buying Ennead Architects, a 160‑person practice known for high‑profile civic and cultural work.

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