...A focus on investment-grade rated tenants--along with the company's dual strategies to either own single-tenant buildings strategic to the tenant or those that can be leased to government tenants with high security needs or a mission strategic to their locations--should result in relatively high tenant retention rates and stable cash flows. We favor Office Properties Income Trust's focus on investment-grade rated tenants, which accounted for 62.8% of annualized rental income as of June 30, 2020. The U.S. government (25.2%) is the company's top tenant, providing even greater tenant stability given its high credit quality and prevalence to renew leases. Moreover, we believe cash-flow stability is buttressed by OPI's dual investment focus on owning either single-tenant properties that are strategic to the tenant (including corporate headquarters, build-to-suit properties, and buildings where tenants have invested meaningful capital) and that have at least seven years of remaining lease term;...