Brookdale Senior Living Inc. owns and operates senior living communities in the United States. It operates through five segments: Retirement Centers, Assisted Living, Continuing Care Retirement Centers (CCRCs) – Rental, Brookdale Ancillary Services, and Management Services. The Retirement Centers segment owns or leases communities comprising independent living and assisted living units in a single community that are primarily designed for middle to upper income senior citizens. The Assisted Living segment owns or leases communities consisting of freestanding, multi-story communities, and freestanding single story communities, which offer housing and 24-hour assistance with activities of daily life to mid-acuity frail and elderly residents. This segment also operates memory care communities for residents with Alzheimer's disease and other dementias. The CCRCs - Rental segment owns or leases communities that offer various living arrangements and services to accommodate various levels of physical ability and health. The Brookdale Ancillary Services segment provides outpatient therapy, home health, and hospice services to residents of its communities, as well as to other senior living communities. The Management Services segment operates communities under the management agreements. As of December 31, 2015, the company operated 130 retirement center communities with 24,486 units; 915 assisted living communities with 62,567 units; and 78 CCRCs with 21,367 units, as well as owned or leased 959 communities with 81,067 units and provided management services with respect to 164 communities with 27,353 units for third parties or unconsolidated ventures. Brookdale Senior Living Inc. is headquartered in Brentwood, Tennessee.