Sienna Senior Living, Inc. engages in owning and managing seniors' living residences. It operates through the following segments: Retirement, Long-Term Care (LTC), and Corporate, Eliminations and Other. The Retirement segment consists of 27 RRs, five of which are located in the Province of British Columbia and 22 of which are located in the Province of Ontario, and the RR management services business. The LTC segment comprises of 35 LTC residences in the Province of Ontario, eight seniors' living residences located in the Province of British Columbia, and the LTC management services business. The Corporate, Eliminations and Other segment represents the results of head office, intercompany eliminations, and other items that are not allocable to the segments. The company was founded in 1972 and is headquartered in Markham, Canada.