Senior Housing Properties Trust is a real estate investment trust (REIT). The Company operates through four segments. The first segment includes triple net senior living communities that provide short term and long term residential care and dining services for residents. Properties in this segment include leased independent living communities, assisted living communities and skilled nursing facilities. The second segment includes managed senior living communities that provide residential care and dining services for residents. Properties in this segment include managed independent living communities and assisted living communities. The third segment includes properties where medical related activities occur but where residential overnight stays and dining services are not provided. Properties in this segment include medical office buildings (MOBs). The fourth segment includes the operating results of certain properties that offer fitness, wellness and spa services.