Mason-McDuffie Mortgage Corporation, headquartered in San Ramon, CA is a mortgage banker, licensed in 22 states. With a rich history in real estate, Mason-McDuffie has been a leader in mortgage lending since 1887. In 1982 the Company held the 6th largest portfolio in the U.S. and was purchased by Weyerhaeuser Mortgage Company that same year. Mason-McDuffie was reestablished in 2005 through the joint venture of several original partners. Leveraging the extensive experience of its senior management and loan officers, Mason McDuffie offers a broad range of loan products using the newest and most innovative technology available in the mortgage industry