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. In 2016 Architect named ZGF the #1 architecture firm in the country, citing the organizations dedication to sustainability as a major deciding factor. Between the companys five offices in the United States and their office in Canada they employ more than 500 employees. The company was founded in 1942 in Portland. ZGF won the American Institute of Architects' Architecture Firm Award, bestowed "for consistently producing distinguished architecture," in 1991. In July 2009, the company moved into a new headquarters on southwest 12th Avenue and Washington Street in downtown Portland from southwest Third and Oak. As of 2012[update], ZGF has offices in Seattle, Los Angeles, Washington DC, and New York in addition to the headquarters in Portland. The Portland headquarters—which is the largest architecture firm in Portland—is the largest of the five offices, employing about 250 people. Since 2013, the firms managing partner has been Ted Hyman.