Gensler grew rapidly with offices opening around the U.S. in the 1970s and 1980s and then overseas in the 1980s and 1990s. In 1972, the firm established an office in Houston to provide interior design services for Pennzoil Company's 600,000-sq-ft corporate headquarters. In 1979, the firm opened its New York office to provide interior design and production services for Mobil Oil Corporation's corporate headquarters in Fairfax, Virginia. In 1988, the firm launched its first overseas office in London, followed by new offices in Tokyo and Hong Kong in 1993. In 2002, Gensler opened an office in Shanghai, establishing a permanent presence in China. By the early 2000s, Gensler was the largest architecture and design company headquartered in the U.S.