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CONCENTRATIONS (Tables) | 6 Months Ended
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Jun. 30, 2015
Revenues |
Concentrations |
Schedule of concentration risk from properties |
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |
California |  |  | 63.0 | % |  | 60.2 | % |  | 62.8 | % |  | 60.3 | %
Washington, D.C. |  |  | 24.5 |  |  | 23.9 |  |  | 24.2 |  |  | 24.3 |
Texas |  |  | 7.8 |  |  | 7.7 |  |  | 7.6 |  |  | 7.7 |
North Carolina |  |  | 4.5 |  |  | 6.1 |  |  | 4.5 |  |  | 5.6 |
New York |  |  | 0.2 |  |  | 2.1 |  |  | 0.9 |  |  | 2.1 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 100.0 | % |  | 100.0 | % |  | 100.0 | % |  | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Real estate investments |
Concentrations |
Schedule of concentration risk from properties |
|  | June 30, 2015 |  | December 31, 2014 |
California |  |  | 52.5 | % |  | 52.3 | %
Washington, D.C. |  |  | 31.1 |  |  | 31.2 |
Texas |  |  | 7.4 |  |  | 7.4 |
North Carolina |  |  | 5.4 |  |  | 5.5 |
New York |  |  | 3.6 |  |  | 3.6 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 100.0 | % |  | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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