Columbia Property Trust Inc is a real estate investment trust engaged in acquiring, developing, and leasing office properties in large metropolitan areas throughout the United States. In terms of total square footage, the company's real estate portfolio is primarily composed of offices in San Francisco, Atlanta, New York City, Cleveland, and Houston. Columbia Property also derives most of its total revenue in the form of rental income from these same cities. The company's largest office tenants are legal services firms, business services companies, depository institutions, and securities and commodities brokers. These industries contribute the majority of Columbia's total rent revenue.