Concentration	3 Months Ended
Mar. 31, 2016
Concentration
Concentration	Note 6. Concentration Tenant and Credit Concentration We define annualized rental income as the annualized contractual base rents from our tenants pursuant to our lease agreements as of the measurement date, plus straight line rent adjustments and estimated recurring expense reimbursements to be paid to us, and excluding lease value amortization. The U.S. Government, 12 state governments, and three other government tenants combined were responsible for approximately 92.8% and 92.7% of our annualized rental income, excluding one property (one building) classified as discontinued operations, as of March 31, 2016 and 2015, respectively. The U.S. Government is our largest tenant by annualized rental income and was responsible for approximately 64.6% and 67.7% of our annualized rental income, excluding one property classified as discontinued operations, as of March 31, 2016 and 2015, respectively. Geographic Concentration At March 31, 2016, our 72 properties (92 buildings), excluding one property (one building) classified as discontinued operations, were located in 31 states and the District of Columbia. Properties located in California, Virginia, the District of Columbia, Georgia, Maryland, New York and Massachusetts were responsible for approximately 14.6%, 10.0%, 9.9%, 8.8%, 8.2%, 8.0% and 5.3% of our annualized rental income as of March 31, 2016, respectively.

Concentration

3 Months Ended

Mar. 31, 2016

Note 6. Concentration

Tenant and Credit Concentration

We define annualized rental income as the annualized contractual base rents from our tenants pursuant to our lease agreements as of the measurement date, plus straight line rent adjustments and estimated recurring expense reimbursements to be paid to us, and excluding lease value amortization. The U.S. Government, 12 state governments, and three other government tenants combined were responsible for approximately 92.8% and 92.7% of our annualized rental income, excluding one property (one building) classified as discontinued operations, as of March 31, 2016 and 2015, respectively. The U.S. Government is our largest tenant by annualized rental income and was responsible for approximately 64.6% and 67.7% of our annualized rental income, excluding one property classified as discontinued operations, as of March 31, 2016 and 2015, respectively.

Geographic Concentration

At March 31, 2016, our 72 properties (92 buildings), excluding one property (one building) classified as discontinued operations, were located in 31 states and the District of Columbia. Properties located in California, Virginia, the District of Columbia, Georgia, Maryland, New York and Massachusetts were responsible for approximately 14.6%, 10.0%, 9.9%, 8.8%, 8.2%, 8.0% and 5.3% of our annualized rental income as of March 31, 2016, respectively.