Emeritus Corporation operates senior living communities that provide assisted living, and Alzheimers and dementia care services to senior citizens in the United States. Its communities provide residential housing alternatives, including independent living, assisted living, specialized memory care, and skilled nursing services. As of December 31, 2009, the company operated or had an investment in 308 assisted living communities consisting of approximately 27,100 residential rooms or suites with a capacity for approximately 32,300 residents. It also provides management services to independent and related-party owners of assisted living communities. Emeritus Corporation was founded in 1993 and is based in Seattle, Washington.