One Architecture & Urbanism, One Architecture & Urbanism (ONE) is an award-winning design and planning firm with offices in Amsterdam and New York. Established in 1995, the firm is known for its unique approach in which financial, technical, and organizational issues are addressed and resolved through design.ONE is a global leader in large-scale climate adaptation and waterfront infrastructure planning. Under the leadership of founding principal Matthijs Bouw, ONE has been instrumental in the development of complex, mul.