RMR Mortgage Trust, a real estate finance company, focuses on originating and investing in first mortgage loans secured by middle market and transitional commercial real estate in the United States. The company has elected to be taxed as a real estate investment trust. As a result, it would not be subject to corporate income tax on that portion of its net income that is distributed to shareholders. The company was formerly known as RMR Real Estate Income Fund. RMR Mortgage Trust was founded in 2008 and is headquartered in Newton, Massachusetts.