is an American family-held, full-service real estate development, investment and management firm based in New York City.

Founded in 1957 by Chairman Larry Silverstein, the company specializes in developing, acquiring, and managing office, residential, hotel, retail, and mixed-use properties.

[1] Silverstein Properties' real estate business has been one of the largest investors in New York City real estate over the past fifty years,[2] having developed, owned and managed more than 40 million square feet of office, residential, hotel and retail properties including the new World Trade Center, 30 Park Place (Four Seasons Private Residences New York Downtown), 120 Wall Street, Equitable Building, and Americas Tower.

[3] Silverstein Properties is headquartered at 7 World Trade Center in Manhattan, New York City.

Notable past and current projects include:[5] Since 2012, SPI has been ranked 33rd of the "Best Places to Work in New York City" by Crain's.