For 10 years, Maas worked as a principal in the firm Potomac Sports Properties, Inc., which developed residential and resort communities involving the PGA TOUR, Inc., including the Tournament Players Club ("TPC") at Avenel, TPC at Cheval, TPC at Virginia Beach and the Four Seasons Hualalai.
During the 1980s, Fred Maas also led the real estate consulting practice for the National Strategies and Marketing Group (NS&MG), a firm that specialized in public affairs, grassroots lobbying, strategic planning, community relations and crisis management.