|Sunstone Hotel Investors, Inc. is a real estate investment trust (REIT). The Company's primary business is to acquire, own, asset manage and renovate full-service hotel properties in the United States. The classifications luxury, upper upscale and upscale is defined by Smith Travel Research, an independent provider of lodging industry statistical data. Smith Travel Research classifies hotel chains into the following segments: luxury; upper upscale; upscale; upper midscale; midscale; economy; and independent. In May 2013, Sunstone Hotel Investors Inc acquired Royal St Charles Hotel from St Charles Hotel Investors LLC. In July 2013, Sunstone Hotel Investors Inc announced that it has completed the acquisition of the 1,053-room Boston Park Plaza hotel located in Boston, Massachusetts. In December 2013, Sunstone Hotel Investors Inc completed the acquisition of the 802-room Hyatt Regency San Francisco hotel located in San Francisco, California.