Annual report pursuant to Section 13 and 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 ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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    
Deferred costs, net $ 6,246,000 $ 0    
Prepaid expenses 3,730,000 252,000    
Right-of-use assets, net 30,958,000 7,630,000    
Investment in unconsolidated entity 18,631,000 0    
Restricted cash 0 3,915,000 $ 3,719,000 $ 2,850,000
Other assets, net 936,000 0    
Total 60,501,000 11,797,000    
Amortization of deferred costs 300,000 0    
Accumulated amortization of deferred costs 300,000      
Amortization expense for below market right-of-use, less than 100,000      
Right of use asset - financing leases 13,800,000      
Operating lease right-of-use assets 30,958,000 7,630,000    
Below market lease, right-of-use asset 7,100,000      
Below market-leases accumulated amortization, less than $ 14,459,000 $ 13,482,000