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
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Receivables [Abstract]        
Operating lease, right-of-use asset, statement of financial position [Extensible Enumeration] Total   Total  
Finance lease, right-of-use asset, statement of financial position [Extensible Enumeration] Total   Total  
Restricted cash $ 35,483,000 $ 725,000 $ 0 $ 3,915,000
Right-of-use assets, net 26,023,000   30,958,000  
Investment in unconsolidated entity 17,953,000   18,631,000  
Deferred costs, net 5,709,000   6,246,000  
Prepaid expenses 2,813,000   3,730,000  
Other assets, net 4,690,000   936,000  
Total 92,671,000   60,501,000  
Amortization of deferred costs 500,000 0    
Accumulated amortization of deferred costs 800,000   300,000  
Amortization expense for below market right-of-use, less than 100,000 $ 0    
Right of use asset - financing leases 9,000,000   13,800,000  
Operating lease right-of-use assets 10,000,000   10,200,000  
Below market lease, right-of-use asset 7,100,000   7,100,000  
Below market-leases accumulated amortization, less than $ 16,075,000   $ 14,459,000