About Douglas Elliman Real Estate Douglas Elliman Real Estate is New York's largest residential brokerage, with over 70 offices in New York City, Long Island, the Hamptons, Westchester/Putnam, and South Florida and more than 4,000 real estate agents and a network of national and international affiliates. They are strategic partners with London -based Knight Frank LLP for residential business in all of their New York markets. Douglas Elliman ranked in the top four of all real estate companies in the nation in 2007, 2008, 2009, 2010, 2011, and 2012. The company also controls a portfolio of real estate services, including Manhattan's largest residential property manager, Douglas Elliman Property Management, as well as DE Title and DE Capital Mortgage.