Triangle Properties is a privately held commercial real estate firm headquartered in Jericho, New York. Established in 1972, the company specializes in property ownership, management, and leasing across Long Island. Its portfolio includes office, industrial, and retail properties, and the firm provides services such as tenant representation, buyer representation, and real estate consulting. Triangle Properties also offers marketing for property sales and leases, along with advisory services related to tax incentives and mortgage financing. The company is known for its long-term ownership strategy and hands-on approach to property management, which has contributed to its reputation for stability and expertise in the regional market. Triangle Properties operates independently and continues to serve businesses seeking strategic commercial space solutions.