Quarterly report pursuant to Section 13 or 15(d)

Orion Office REIT, Receivables and Other Assets - Other Assets (Details)

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Orion Office REIT, Receivables and Other Assets - Other Assets (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Receivables [Abstract]            
Restricted cash $ 35,145,000 $ 531,000 $ 35,145,000 $ 531,000 $ 0 $ 3,915,000
Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration] Total   Total   Total  
Finance lease, right-of-use asset, statement of financial position [Extensible Enumeration] Total   Total   Total  
Right-of-use assets, net $ 25,567,000   $ 25,567,000   $ 30,958,000  
Investment in unconsolidated entity 16,544,000   16,544,000   18,631,000  
Derivative assets 7,057,000   7,057,000   299,000  
Deferred costs, net 4,616,000   4,616,000   6,246,000  
Prepaid expenses 2,058,000   2,058,000   3,730,000  
Other assets, net 645,000   645,000   637,000  
Total 91,632,000   91,632,000   60,501,000  
Amortization expense for below market right-of-use, less than 100,000 0 100,000 0    
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 9,000,000   9,000,000   13,800,000  
Operating lease, right-of-use asset 9,600,000   9,600,000   10,200,000  
Below market-leases accumulated amortization 200,000   200,000   100,000  
Below market lease, right-of-use asset 7,100,000   7,100,000   7,100,000  
Amortization of deferred costs 500,000 $ 0 1,600,000 $ 0    
Accumulated amortization of deferred costs $ 1,900,000   $ 1,900,000   $ 300,000