|
Properties, net (Details 4) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
sqft
Property
|
Dec. 31, 2013
Property
sqft
|
|
| Newly-constructed properties placed in service | ||
| Construction and Redevelopment Activities | ||
| Square Feet of Properties Placed in Service |
692,000ofc_SquareFeetofPropertiesPlacedinService / us-gaap_RealEstatePropertiesAxis = ofc_NewlyConstructedPropertiesPlacedInServiceMember |
812,000ofc_SquareFeetofPropertiesPlacedinService / us-gaap_RealEstatePropertiesAxis = ofc_NewlyConstructedPropertiesPlacedInServiceMember |
| Number of Real Estate Properties Placed In Service |
5ofc_NumberOfRealEstatePropertiesPlacedInService / us-gaap_RealEstatePropertiesAxis = ofc_NewlyConstructedPropertiesPlacedInServiceMember |
8ofc_NumberOfRealEstatePropertiesPlacedInService / us-gaap_RealEstatePropertiesAxis = ofc_NewlyConstructedPropertiesPlacedInServiceMember |
| Properties under construction or contractually committed for construction | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
8us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderConstructionOrContractuallyCommitedForConstructionMember |
|
| Square footage of real estate properties (in square feet) |
1,200,000us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderConstructionOrContractuallyCommitedForConstructionMember |
|
| Properties under construction or contractually committed for construction | Northern Virginia | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
4us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderConstructionOrContractuallyCommitedForConstructionMember / ofc_RealEstatePropertyLocationAxis = ofc_NorthernVirginiaMember |
|
| Properties under construction or contractually committed for construction | Baltimore and Washington Corridor | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
2us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderConstructionOrContractuallyCommitedForConstructionMember / ofc_RealEstatePropertyLocationAxis = ofc_BaltimoreAndWashingtonCorridorMember |
|
| Properties under construction or contractually committed for construction | Huntsville | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
1us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderConstructionOrContractuallyCommitedForConstructionMember / ofc_RealEstatePropertyLocationAxis = ofc_HuntsvilleMember |
|
| Properties under construction or contractually committed for construction | San Antonio | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
1us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderConstructionOrContractuallyCommitedForConstructionMember / ofc_RealEstatePropertyLocationAxis = ofc_SanAntonioMember |
|
| Properties under redevelopment | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
5us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderorApprovedforRedevelopmentMember |
|
| Square footage of real estate properties (in square feet) |
344,000us-gaap_AreaOfRealEstateProperty / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderorApprovedforRedevelopmentMember |
|
| Properties under redevelopment | Baltimore and Washington Corridor | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
3us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderorApprovedforRedevelopmentMember / ofc_RealEstatePropertyLocationAxis = ofc_BaltimoreAndWashingtonCorridorMember |
|
| Properties under redevelopment | Greater Philadelphia | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
1us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderorApprovedforRedevelopmentMember / ofc_RealEstatePropertyLocationAxis = ofc_GreaterPhiladelphiaMember |
|
| Properties under redevelopment | St Marys County | ||
| Construction and Redevelopment Activities | ||
| Number of real estate properties |
1us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = ofc_PropertiesUnderorApprovedforRedevelopmentMember / ofc_RealEstatePropertyLocationAxis = ofc_StMarysCountyMember |
|
| Greater Philadelphia | ||
| Construction and Redevelopment Activities | ||
| Depreciation Expense Resulting From Useful Life Change |
12.9ofc_DepreciationExpenseResultingFromUsefulLifeChange / us-gaap_StatementGeographicalAxis = ofc_GreaterPhiladelphiaMember |
|
| X | ||||||||||
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- Definition
Additional depreciation expense recognized resulting from a change in the useful life of the disclosed asset. No definition available.
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- Definition
Represents the number of real estate properties placed in service during the year. No definition available.
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- Definition
The amount of square footage placed into service during the period. No definition available.
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- Definition
Area of a real estate property. No definition available.
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- Details
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- Definition
The number of real estate properties owned as of the balance sheet date. No definition available.
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