Diamond Properties is a privately held commercial real estate investment and property management firm based in Mount Kisco, New York. Founded in 1995, the company operates a value-add investment strategy targeting underperforming commercial properties with potential for improvement through hands-on property management, market repositioning, and capital upgrades. The firm's portfolio currently spans 16.6 million square feet across 13 states, with a total portfolio value exceeding $1.3 billion. Industrial assets represent 71% of the portfolio by dollar value, with the balance comprising office, retail, hospitality, medical, and land holdings. In 2024, Diamond Properties acquired six properties across Ohio, North Carolina, Indianapolis, and Florida, adding 1.4 million square feet to its holdings while maintaining a 96% occupancy rate. The company completed a seven-year redevelopment project in 2024, transforming a former Grand Union warehouse into a multi-use property anchored by an 85,000-square-foot ShopRite supermarket in Mount Kisco.