Company: CIO
Filing Date: 2025-03-12
Form Type: DEFA14A
Source: 0001193125-25-052438
Chunk: 0

Company: City Office REIT, Inc.
Filing Date: 2025-03-12
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material under Rule 14a-12 |

CITY OFFICE REIT, INC. (Name of Registrant as Specified in its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 
 14a-6(i)(1) and 0-11.                                                          |

Important Notice of Availability of Proxy Materials for the Stockholder Meeting of CITY OFFICE REIT, INC. To Be Held On Thursday, May 1, 2025 at 9:00 a.m., PDT at 666 Burrard Street, Suite 3210, Vancouver, BC V6C 2X8

| COMPANY NUMBER |
| ACCOUNT NUMBER |
| CONTROL NUMBER |

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. If you want to receive a paper or e-mailcopy of the proxy materials you must request one. There is no charge to you for requesting a copy. To facilitate timely delivery please make the request as instructed below before April 16, 2025. Please visit http://www.astproxyportal.com/ast/18940/, where the following materials are available for view:

|                      |     |                                                                                     |     | • Notice of Annual Meeting of Stockholders                                                                                                                                                    
 • Proxy Statement • Form of Electronic Proxy                                                                                                                                                  
 Card • Annual Report on Form 10-K                                                                                                                                                             |
| TO REQUEST MATERIAL