Company: CIO
Filing Date: 2025-07-24
Form Type: DEFA14A
Source: 0001193125-25-163769
Chunk: 216

Company: City Office REIT, Inc.
Filing Date: 2025-07-24
Form: DEFA14A
Chunk 216
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 parties hereto execute this Amendment, to be effective as of July 23, 2025.

| CITY OFFICE MANAGEMENT ULC                   |     |                        |
| By:                                          |     | City Office REIT, Inc. |
| By:                                          |     | /s/ John Sweet         |
| Name: John Sweet                             |     |                        |
| Title: Chairman of the Board of Directors    |     |                        |
| CITY OFFICE REIT Operating Partnership, L.P. |     |                        |
| By:                                          |     | City Office REIT, Inc. |
| By:                                          |     | /s/ John Sweet         |
| Name: John Sweet                             |     |                        |
| Title: Chairman of the Board of Directors    |     |                        |
| /s/ James Farrar                             |     |                        |
| James Farrar                                 |     |                        |

[ Signature Page to Amendment No. 3 to the Executive Employment Agreement of City Office REIT, Inc.]

Exhibit 99.1

City Office REIT Enters into Definitive Agreement for Sale at $7.00 per Share of Common Stock in Transaction Valued at Approximately $1.1 Billion

VANCOUVER—July 24, 2025— City Office REIT, Inc. (NYSE: CIO) (“City Office”, or
the “Company”) today announced that it has entered into a definitive merger agreement (“the Merger Agreement”) with MCME Carell Holdings, LP and MCME Carell Holdings, LLC (collectively, “MCME Carell” or the
“Buyer”) under which, subject to the satisfaction of the conditions set forth in the Merger Agreement, MCME Carell will acquire (other than shares owned by the Buyer, the Company or their respective affiliates) all of the issued and
outstanding shares of City Office for $7.00 per share of common stock in cash (the “Transaction”).

Subject to the satisfaction of the
conditions set forth in the Merger Agreement – which includes, among other things, the sale of the Company’s Phoenix portfolio (as more thoroughly described in the Merger Agreement and accompanying filing made by the Company on Form 8-K) – holders of City Office’s common stock will receive $7.00 per share in cash at closing of the Transaction. The Transaction price represents a premium of 26% to City Office’s common
stock closing share price on the NYSE on the last trading day prior