|American Assets Trust, Inc. is a full-service vertically integrated and self-administered real estate investment trust (REIT). The Company owns, operates, acquires and develops retail, office, multifamily and mixed-use properties primarily in Southern California, Northern California, Oregon and Hawaii. The Company operates in four business segments: retail, office, multi-family and mixed-use. As of December 31, 2011, its portfolio consisted of 10 retail shopping centers; six office properties; a mixed-use property consisting of a 369-room all-suite hotel and a retail shopping center, and four multifamily properties. As of December 31, 2011, it owned land at five of its properties that the Company classified as held for development. On January 24, 2012, it acquired One Beach Street, consisting of approximately 97,000 rentable square feet in a renovated office building located along the Embarcadero in San Francisco's North Waterfront District.