Swiss Prime Site AG is a real estate investment company, which engages in the acquisition, sale, management, development, and leasing of real estate properties. It operates through the following business segments: Real Estate, Retail, and Assisted Living. The Real Estate segment includes the Wincasa and Real Estate Investment Management for the Swiss Prime Investment Foundation. The Retail segment comprises of department stores operated by Jelmoli-The House of Brands. The Assisted Living covers operations by Tertianum Group and SENIOcare Group. The company was founded on May 11, 1999 and is headquartered in Olten, Switzerland.