Quarterly report pursuant to Section 13 or 15(d)

Orion Office REIT, Organization and Summary of Significant Accounting Policies (Details)

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Orion Office REIT, Organization and Summary of Significant Accounting Policies (Details)
ft² in Millions
Sep. 30, 2021
ft²
property
state
$ / shares
Jul. 15, 2021
$ / shares
Real Estate Properties [Line Items]    
Common stock, par value (in dollars per share) | $ / shares $ 0.001 $ 0.01
Number of real estate properties | property 92  
Area of real estate property | ft² 10.5  
Number of states with real estate properties owned | state 29  
Arch Street Joint Venture    
Real Estate Properties [Line Items]    
Number of real estate properties | property 5  
Area of real estate property | ft² 0.8  
Number of states with real estate properties owned | state 5