Description Whether you're looking for a chic downtown condo or a countryside estate, Racebrook Marketing Concepts has got it. Operating as Sheldon Good, the company's one of the nation's leading real estate auction firms. It offers conventional brokerage services, real estate consulting, and financial services that include short-term lending for real estate owners, buyers, and sellers. Founded in 1965, the company has completed more than 40,000 residential and commercial property sales in the US and abroad. In 2009 an affiliate of investment firm Racebrook Capital acquired Sheldon Good out of bankruptcy.