Silverstone Property Group is a full-service residential real estate company. It offers development, investment, asset management, building management and leasing services for condos, homeowner associations and apartments. The firm was founded by Martin Nussbaum in 2009 to capitalize on distressed properties at the bottom of the market. Four years later, when Nussbaum founded Slate Property Group, Silverstone was at the peak of its power, having purchased more than 22 properties worth roughly $350 million. In 2013 Silverstone sold its West Village multifamily building for almost $20 million and a building in Bushwick for $18 million. In recent years, however, the firm has reduced its holdings as Nussbaum moved on from Silverstone and focused entirely on Slate. In 2016, Silverstone was accused by tenants at 211 Madison Street of depriving them of cooking gas in order to harass them into accepting buyout offers.