v3.25.4
Document and Entity Information
Jan. 09, 2026
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001593222
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Jan. 09, 2026
Entity Registrant Name City Office REIT, Inc.
Entity Incorporation State Country Code MD
Entity File Number 001-36409
Entity Tax Identification Number 98-1141883
Entity Address, Address Line One 666 Burrard Street
Entity Address, Address Line Two Suite 3210
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V6C 2X8
City Area Code (604)
Local Phone Number 806-3366
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, $0.01 par value
Trading Symbol CIO
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title 6.625% Series A Cumulative Redeemable Preferred Stock, $0.01 par value per share
Trading Symbol CIO.PrA
Security Exchange Name NYSE