Real Estate Investments - Schedule of Allocation of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Cherry Creek [Member] |
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Business Acquisition [Line Items] |
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Land |
$ 25,745us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Buildings and improvements |
15,771cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Tenant Improvements |
4,372cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Acquired intangible assets |
12,009us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Accounts payable and other/accrued liabilities |
(815)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Lease intangible liability |
(249)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLeaseIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Fair value of assets and liabilities at acquisition |
56,833us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_CherryCreekMember |
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Plaza 25 [Member] |
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Business Acquisition [Line Items] |
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Land |
1,764us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Buildings and improvements |
18,487cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Tenant Improvements |
2,076cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Prepaid expenses and other assets |
2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Acquired intangible assets |
2,924us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Accounts payable and other/accrued liabilities |
(641)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Lease intangible liability |
(328)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLeaseIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Fair value of assets and liabilities at acquisition |
24,284us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_PlazaTwentyFiveMember |
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Lake Vista Pointe [Member] |
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Business Acquisition [Line Items] |
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Land |
4,115us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Buildings and improvements |
17,562cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Tenant Improvements |
3,038cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Prepaid expenses and other assets |
30us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Acquired intangible assets |
3,685us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Accounts payable and other/accrued liabilities |
(1,733)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Fair value of assets and liabilities at acquisition |
26,697us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_LakeVistaPointeMember |
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Florida Research Park [Member] |
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Business Acquisition [Line Items] |
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Land |
4,415us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Buildings and improvements |
16,376cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Tenant Improvements |
1,399cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Prepaid expenses and other assets |
104us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Acquired intangible assets |
4,309us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Accounts payable and other/accrued liabilities |
(41)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Fair value of assets and liabilities at acquisition |
26,562us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_FloridaResearchParkMember |
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Washington Group Plaza [Member] |
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Business Acquisition [Line Items] |
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Land |
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12,748us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Buildings and improvements |
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18,000cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Tenant Improvements |
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2,717cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Prepaid expenses and other assets |
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219us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Deferred leasing costs |
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12cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredLeasingCosts / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Acquired intangible assets |
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10,470us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Accounts payable and other/accrued liabilities |
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(1,234)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Acquired intangible liabilities |
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(18)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Fair value of assets and liabilities at acquisition |
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42,914us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaMember |
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Corporate Parkway [Member] |
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Business Acquisition [Line Items] |
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Land |
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3,756us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_CorporateParkwayMember |
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Buildings and improvements |
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18,580cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_CorporateParkwayMember |
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Tenant Improvements |
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1,909cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_CorporateParkwayMember |
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Prepaid expenses and other assets |
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6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_CorporateParkwayMember |
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Acquired intangible assets |
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4,149us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_CorporateParkwayMember |
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Fair value of assets and liabilities at acquisition |
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28,400us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_CorporateParkwayMember |
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Washington Group Plaza and Corporate Parkway [Member] |
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Business Acquisition [Line Items] |
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Land |
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16,504us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Buildings and improvements |
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36,580cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Tenant Improvements |
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4,626cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Prepaid expenses and other assets |
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225us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Deferred leasing costs |
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12cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredLeasingCosts / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Acquired intangible assets |
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14,619us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Accounts payable and other/accrued liabilities |
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(1,234)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Acquired intangible liabilities |
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(18)cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleLiabilities / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Fair value of assets and liabilities at acquisition |
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71,314us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_WashingtonGroupPlazaAndCorporateParkwayMember |
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Central Fairwinds [Member] |
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Business Acquisition [Line Items] |
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Land |
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1,747us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLand / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |
Buildings and improvements |
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9,073cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBuildingsAndImprovements / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |
Tenant Improvements |
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678cio_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedTenantImprovements / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |
Prepaid expenses and other assets |
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57us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |
Acquired intangible assets |
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2,645us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |
Accounts payable and other/accrued liabilities |
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(312)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |
Fair value of assets and liabilities at acquisition |
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$ 13,888us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cio_CentralFairwindsMember |