Exhibit 99.1 City Office REIT Reports First Quarter 2024 Results VANCOUVER—May 3, 2024 —City Office REIT, Inc. (NYSE: CIO) (the “Company,” “City Office,” “we” or “our”) today announced its results for the quarter ended March 31, 2024. First Quarter Highlights • Rental and other revenues were $44.5 million. GAAP net loss attributable to common stockholders was approximately$2.4 million, or ($0.06) per fully diluted share; • Core FFO was approximately$13.5 million, or $0.33 per fully diluted share; • AFFO w ...