XML 54 R42.htm IDEA: XBRL DOCUMENT
v3.21.1

Organization - Narrative 1 (Details) - Mar. 31, 2021 ft² in Millions | property | ft² | MW | a
--- | --- | --- | --- | ---
Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 17 |  |  |
Operating Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 182 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 21.0 |  |
Operating Properties | Office Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 156 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 16.3 |  |
Operating Properties | Single-tenant data centers |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 26 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 4.7 |  |
Operating Properties | Single-tenant data centers | Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 17 |  |  |
Operating wholesale data center |  |  |  |
Investments in real estate |  |  |  |
Critical load (in megawatts) | MW |  |  | 19.25 |
Properties under development |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 10 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 1.4 |  |
Properties under development | Office Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 8 |  |  |
Properties under development | Single-tenant data centers |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 2 |  |  |
Properties under development, partially-operational |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 3 |  |  |
Land controlled for future development |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) |  | 10.4 |  | 820
Other Land |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) | a |  |  |  | 43

X
- Definition Represents the amount of the critical load of the property. Critical load is the amount of megawatts of power made available for the exclusive use tenants in the property. + References No definition available. + Details
Name: | ofc_CriticalLoad
Namespace Prefix: | ofc_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ofc_UnconsolidatedRealEstateJointVenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_OperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=ofc_OfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=ofc_SingleTenantDataCentersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_WholesaleDataCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_PropertiesUnderDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_PropertiesUnderDevelopmentPartiallyOperationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_LandControlledforFutureDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ofc_RealEstatePropertiesStatusAxis=ofc_OtherLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |