First Potomac Realty Trust was formed in July 2003 to be the successor general partner of First Potomac Realty Investment Limited Partnership, the Company's operating partnership. The Company completed its initial public offering in October 2003. It is engaged in ownership, management, development and redevelopment of office, business park and industrial properties in the greater Washington, D.C. region. The Company separates its properties into four distinct reporting segments, which it refers to as the Washington, D.C., Maryland, Northern Virginia and Southern Virginia reporting segments. Its portfolio contains a mix of single-tenant and multi-tenant office and industrial properties, as well as business parks. Office properties are single-story and multi-story buildings that are used mainly for office use; business parks contain buildings with office features combined with some industrial property space; and industrial properties generally are used as warehouse, distribution or manufacturing facilities. The Company conducts its business through First Potomac Realty Investment Limited Partnership, the Company's operating partnership. It is the sole general partner and, as of December 31, 2013, owned 100% interest in, the Operating Partnership. At December 31, 2013, the Company wholly-owned or had a controlling interest in properties totaling 9.1 million square feet and had a noncontrolling ownership interest in properties totaling an additional 0.9 million square feet through five unconsolidated joint ventures. The Company also owned land that can support approximately 1.5 million square feet of additional development. The Company's consolidated properties were 85.8% occupied by 576 tenants at December 31, 2013. The Company derives all of its revenue from leases of space within its properties. The U.S. Government, the Company's largest tenant, accounted for 48% of its outstanding accounts receivable at December 31, 2013. The Company operates so as to qualify as a real estate investment trust (REIT) for federal income tax purposes. It competes with other REITs, public and private real estate companies, private real estate investors and lenders, both domestic and foreign in acquiring and developing properties. The Company's properties are subject to various federal, state and local environmental laws.