architect's office; architectural design firm
Refers to a business office where architectural design work is done, typically by licensed architects.
He works at a famous architectural design firm.
I commissioned an architect's office to design my new house.
建築事務所 is a broader term for an architecture firm that may handle overall building projects, while 設計事務所 specifically emphasizes the design aspect.
architectural firm; architectural design office
Compound of 設計 (design) + 事務所 (office).