Columbia Property Trust, Inc. operates as a real estate investment trust (REIT), which owns and operates commercial real estate properties. The Company's primary objective is to generate long-term shareholder returns from a combination of steadily growing cash flows and appreciation in its net asset values, through the acquisition and ownership of office buildings located principally in high-barrier-to-entry markets. The Company's segments include New York, San Francisco, Atlanta, Washington, D.C., Boston, Los Angeles and all other office markets. The all other office markets segment consists of properties in similar, low-barrier to entry geographic locations, in which the Company does not plan to make further investments. The Company conducts its business primarily through Columbia Property Trust Operating Partnership, L.P. (Columbia Property Trust OP), which acquires, develops, owns, leases and operates real properties directly through subsidiaries or through joint ventures.