Tenant Concentration and Segment Information

9 Months Ended

Sep. 30, 2011

Tenant Concentration and Segment Information

Tenant Concentration and Segment Information

Note 4.  Tenant Concentration and Segment Information

We operate in one business segment: ownership of properties that are majority leased to government tenants.  We define annualized rental income as the annualized rents from our tenants pursuant to our lease agreements with them as of the measurement date, plus estimated expense reimbursements to be paid to us, and excluding lease value amortization.  The U.S. Government, seven state governments and the United Nations combined were responsible for approximately 93.1% and 93.6% of our annualized rental income as of September 30, 2011 and 2010, respectively.  The U.S. Government is our largest tenant by annualized rental income and was responsible for approximately 71.3% and 81.0% of our annualized rental income as of September 30, 2011 and 2010, respectively.