Select Income REIT (SIR) is a real estate investment trust that owns properties primarily net leased to single tenants, including office, industrial buildings, leasable land parcels and easements. The company, founded in 2011 and headquartered in Newton, Massachusetts, focuses on single-tenant net lease properties leased to a diverse tenant base, with a historical portfolio encompassing approximately 45.8 million rentable square feet across 368 buildings and parcels in 36 U.S. states as of September 30, 2018. Its properties include office and industrial assets as well as specialized easements, managed externally by The RMR Group LLC.
SIR's core offerings consist of net leased real estate assets tailored for long-term, stable income, with tenants including investment-grade rated entities; the portfolio historically emphasized single-tenant office properties, industrial facilities, and ground leases. Geographically, operations span multiple U.S. regions, with properties located in 36 states.
In a major strategic development, SIR completed a merger with Government Properties Income Trust (GOV) on December 31, 2018, forming Office Properties Income Trust (OPI), which trades under the new ticker symbol OPI on Nasdaq following a 1-for-4 reverse stock split. This transaction, valued at approximately $2.4 billion including assumed debt, integrated SIR's portfolio of 99 buildings totaling 16.5 million square feet into OPI, enhancing scale, tenant diversification (with high investment-grade rent exposure), and geographic reach while shifting focus to a leading national office REIT strategy. No significant acquisitions, partnerships, funding rounds, or product launches for SIR have been reported since the 2018 merger, as the entity ceased independent operations thereafter.