XML 54 R42.htm IDEA: XBRL DOCUMENT
v3.25.3

Organization (Details) - 9 months ended Sep. 30, 2025 ft² in Thousands | property | ft² | a | shares
--- | --- | --- | --- | ---
Preferred Units |  |  |  |
Investments in real estate |  |  |  |
Limited partners' capital account, units outstanding (in units) | shares |  |  |  | 0
COPT Defense Properties, L.P. | Common Units | COPT Defense Properties |  |  |  |
Investments in real estate |  |  |  |
Percentage ownership in operating partnership | 97.30% |  |  |
Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 24 |  |  |
Operating Properties | Defense/IT Portfolio |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 198 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 22,600 |  |
Operating Properties | Defense/IT Portfolio | Office Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 167 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 16,700 |  |
Operating Properties | Defense/IT Portfolio | Single-tenant data centers |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 31 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 5,900 |  |
Operating Properties | Defense/IT Portfolio | Single-tenant data centers | Unconsolidated Real Estate Joint Ventures |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 24 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 4,300 |  |
Operating Properties | Other | Greater Washington, DC/Baltimore |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 6 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 2,000 |  |
Properties under development | Defense/IT Portfolio |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 5 |  |  |
Area of real estate property (in sqft or acres) | ft² |  | 812 |  |
Properties under development | Defense/IT Portfolio | Office Properties |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 3 |  |  |
Properties under development | Defense/IT Portfolio | Single-tenant data centers |  |  |  |
Investments in real estate |  |  |  |
Number of real estate properties | 2 |  |  |
Land controlled for development | Defense/IT Portfolio |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) |  | 10,700 | 1,000 |
Land controlled for development | Other | Greater Washington, DC/Baltimore |  |  |  |
Investments in real estate |  |  |  |
Area of real estate property (in sqft or acres) | a |  |  | 50 |

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

X
- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482987/272-10-50-3 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of limited partner units outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SAB Topic 4.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5 + Details
Name: | us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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: | us-gaap_StatementEquityComponentsAxis=us-gaap_PreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=cdp_COPTDefensePropertiesLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=cdp_CommonUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=cdp_COPTDefensePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | cdp_RealEstatePropertiesStatusAxis=cdp_OperatingPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cdp_DefenseITPortfolioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=cdp_GreaterWashingtonDCBaltimoreMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cdp_RealEstatePropertiesStatusAxis=cdp_PropertiesUnderDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cdp_RealEstatePropertiesStatusAxis=cdp_LandControlledForDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |