Silverstein Properties is a privately held real estate development, investment, and management firm headquartered at 7 World Trade Center in Manhattan, New York. Founded in 1957 by Chairman Larry Silverstein, the company has evolved into New York City's fifth-largest commercial landlord. The firm specializes in developing, acquiring, and managing office, residential, hotel, retail, and mixed-use properties across more than 40 million square feet developed over its history. Silverstein Properties' current portfolio encompasses 13.4 million square feet of office, residential, and retail space, with $10 billion in active development projects. The company gained prominence through its rebuilding of the World Trade Center complex following the September 11 attacks, developing 7 World Trade Center (completed 2006), 4 World Trade Center, and 3 World Trade Center. In February 2026, American Express announced plans to build its new global headquarters at 2 World Trade Center as the sole owner and occupant, marking a milestone in the campus redevelopment. Beyond the World Trade Center, the portfolio includes Four Seasons Private Residences at 30 Park Place, 120 Wall Street, and River Place in Manhattan. The firm maintains geographic concentration in New York City, with approximately 94% of assets in Manhattan and 5% in Queens. Recent portfolio activity includes the $672 million acquisition of 9 Dekalb Avenue in Brooklyn (June 2024) and the $572.3 million sale of 1177 Avenue of the Americas with partner CalSTRS (September 2025). With over 500 employees, Silverstein Properties operates as a family-held business focused on long-term real estate investment and placemaking in urban markets.