|First Potomac Realty Trust is engaged in the ownership, management, development and redevelopment of office and industrial properties in the greater Washington District of Columbia region. The Company classifies its properties into three segments: Maryland, Northern Virginia and Southern Virginia. The Company includes its properties located in Washington District of Columbia in its Northern Virginia reporting segment. As of December 31, 2011, the Company's portfolio contained 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 primarily 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. It conducts its business through First Potomac Realty Investment Limited Partnership, its operating partnership.