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Concentration (Details)
3 Months Ended
Mar. 31, 2024
property
state
Mar. 31, 2023
Continuing operations    
Concentration    
Number of wholly owned properties | property 151  
Number of states in which acquired properties located | state 30  
Annualized rental income, excluding properties classified as discontinued operations | Tenant concentration | U.S. Government, State Governments and Four Other Governments    
Concentration    
Concentration risk percentage 27.60% 28.50%
Annualized rental income, excluding properties classified as discontinued operations | Tenant concentration | U.S. Government    
Concentration    
Concentration risk percentage 20.20% 19.60%
Annualized rental income, excluding properties classified as discontinued operations | Geographic concentration | Virginia    
Concentration    
Concentration risk percentage 12.10%  
Annualized rental income, excluding properties classified as discontinued operations | Geographic concentration | California    
Concentration    
Concentration risk percentage 11.80%  
Annualized rental income, excluding properties classified as discontinued operations | Geographic concentration | District of Columbia    
Concentration    
Concentration risk percentage 9.90%  
Annualized rental income, excluding properties classified as discontinued operations | Geographic concentration | Georgia    
Concentration    
Concentration risk percentage 9.10%  
Annualized rental income, excluding properties classified as discontinued operations | Geographic concentration | Illinois    
Concentration    
Concentration risk percentage 8.80%