Company: CIO
Filing Date: 2025-07-24
Form Type: DEFA14A
Source: 0001193125-25-163769
Chunk: 9

Company: City Office REIT, Inc.
Filing Date: 2025-07-24
Form: DEFA14A
Chunk 9
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 LLC on July 24, 2025                                                                                                                             |
| 104     |     | Cover Page Interactive Data File (embedded within the Inline XBRL document).                                                                                                                                                                              |

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| Date: July 24, 2025 |     | CITY OFFICE REIT, INC. 
 By:                    |     | /s/ Anthony Maretic                              |
|:--------------------|:----|:-----------------------|:----|:-------------------------------------------------|
|                     |     | Name:                  |     | Anthony Maretic                                  |
|                     |     | Title:                 |     | Chief Financial Officer, Secretary and Treasurer |

Exhibit 2.1

AGREEMENT AND PLAN OF MERGER

among

MCME CARELL HOLDINGS, LP,

MCME CARELL MERGER SUB, LLC

and

CITY OFFICE REIT, INC.

Dated as of July 23, 2025

TABLE OF CONTENTS

|                                                            |     |                                                               |     | Page |    |
| ARTICLE I THE MERGER                                       |     |                                                               |     |      |  2 |
| Section 1.1                                                |     | The Merger                                                    |     |      |  2 |
| Section 1.2                                                |     | Closing                                                       |     |      |  2 |
| Section 1.3                                                |     | Effective Time                                                |     |      |  2 |
| Section 1.4                                                |     | Effects of the Merger                                         |     |      |  3 |
| Section 1.5                                                |     | Organizational Documents of the Surviving Company             |     |      |  3 |
| Section 1.6                                                |     | Officers                                                      |     |      |  3 |
| ARTICLE II EFFECTS OF THE MERGER; EXCHANGE OF CERTIFICATES |     |                                                               |     |      |  3 |
| Section 2.1                                                |     | Effects on Company Common Shares and Company Preferred Shares |     |      |  3 |
| Section 2.2                                                |     | Treatment of Company Stock Awards                             |     |      |  4 |
| Section 2.3                                                |     | Exchange and Payment                                          |     |      |