ZGF Architects LLP (ZGF), formerly Zimmer Gunsul Frasca Partnership, is an American architectural firm with offices in Portland, Oregon, Seattle, Washington, Los Angeles, California, Washington D.C., New York, New York, and, as ZGF Cotter Architects Inc., in Vancouver, Canada. Founded in 1942, the firm was listed in 2011 as the #4 architectural firm in the United States by Building Design+Construction, and ranked the #9 architectural firm by Architect Magazine.