From offices in San Francisco, California, the Warren Law Firm provides legal advice and representation for clients throughout the North, South and East Bay region and Silicon Valley, including Bay Area communities such as San Rafael, Oakland, Modesto, Stockton, Hayward, Fremont, San Jose, Palo Alto, Santa Rosa and Fresno, CA. Our U.S. immigration law services extend to clients throughout the United States and international clients throughout the world. Also practicing business law and international trade.