COPT Defense Properties Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Cover
- Document and Entity Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Summary of Significant Accounting Policies (Policies)
Notes Tables
Notes Details

Organization (Details)

v2.4.0.6

Organization (Details)	12 Months Ended
Organization (Details)	Dec. 31, 2011 sqfeet property
Operating office properties
Investments in real estate
Number of real estate properties	238
Square footage of real estate properties (in square feet)	20,500,000
Office properties under construction or redevelopment
Investments in real estate
Number of real estate properties	7
Square footage of real estate properties (in square feet)	903,000
Office properties under construction or redevelopment which are partially operational
Investments in real estate
Number of real estate properties	1
Land held or under pre-construction
Investments in real estate
Area of land held or under pre-construction (in acres)	2,330
Represents the area of land parcels held or under pre-construction that is controlled but not owned (in acres)	583
Developable square footage of real estate properties (in square feet)	20,600,000
Partially operational, wholesale data center
Investments in real estate
The expected stabilization critical load after completion of development (in megawatts)	18

- Definition

Represents the area of land parcels in acres.

+ References

No definition available.

+ Details

Name:	ofc_AcresOfRealEstateProperty
Namespace Prefix:	ofc_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the area of land parcels controlled but not owned, in acres.

+ References

No definition available.

+ Details

Name:	ofc_AcresOfRealEstatePropertyControlledButNotOwned
Namespace Prefix:	ofc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of square feet into which a land parcel is potentially developable.

+ References

No definition available.

+ Details

Name:	ofc_DevelopableSquareFeet
Namespace Prefix:	ofc_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the expected stabilization critical load after completion of development 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_ExpectedStabilizationCriticalLoad
Namespace Prefix:	ofc_
Data Type:	num:powerItemType
Balance Type:	na
Period Type:	instant

- 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

- Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of square footage related to a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_SquareFootageOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration