We are a publicly traded REIT with a diversified portfolio of primarily private pay senior housing properties located across the United States. We are one of the largest owners of senior housing properties in the United States. As of December 31, 2018, our portfolio was comprised of 133 primarily private pay senior housing properties located across 37 states.
We were formed as a Delaware limited liability company and wholly owned subsidiary of Drive Shack Inc., formerly Newcastle Investment Corp. ("Drive Shack"), on May 17, 2012. On November 6, 2014, we were spun off from Drive Shack and listed on the NYSE under the symbol "SNR." We are headquartered in New York, New York.
Through December 31, 2018, we were externally managed and advised by an affiliate of Fortress Investment Group LLC (the "Manager"). On November 19, 2018, we entered into definitive agreements with the Manager to internalize our management, effective December 31, 2018 (the "Internalization"). In connection with the Internalization, we also entered into a Transition Services Agreement with the Manager to continue to provide certain services for a transition period. Following the effectiveness of the Internalization, our board of directors concluded its formal review of strategic alternatives, which the Company initially announced in February 2018. However, our board of directors, together with our management team, continues to focus on enhancing corporate strategy to maximize stockholder value.