XML 76 R27.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Properties, net (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2012
Properties, net |
Schedule of components of net operating properties |
|  | March 31, |  | December 31, |
|  | 2012 |  | 2011 |
Land |  | $ | 471,995 |  | $ | 472,483 |
Buildings and improvements |  | 2,802,570 |  | 2,801,252 |
Less: accumulated depreciation |  | (570,242 | ) | (559,679 | )
Operating properties, net |  | $ | 2,704,323 |  | $ | 2,714,056
Schedule of projects in development or held for future development |
|  | March 31, |  | December 31, |
|  | 2012 |  | 2011 |
Land |  | $ | 225,085 |  | $ | 229,833 |
Construction in progress, excluding land |  | 408,883 |  | 409,086 |
Projects in development or held for future development |  | $ | 633,968 |  | $ | 638,919
Schedule of operating property dispositions |
We sold the following operating properties during the three months ended March 31, 2012 (dollars in thousands):
|  |  |  |  |  | Number |  | Total |  |  |  |  |
|  |  |  | Date of |  | of |  | Rentable |  |  |  | Gain on |
Project Name |  | Location |  | Sale |  | Buildings |  | Square Feet |  | Sale Price |  | Sale |
White Marsh Portfolio (1) |  | White Marsh, Maryland |  | 1/30/2012 |  | 5 |  | 163,000 |  | $ | 19,100 |  | $ | 2,445 |
1101 Sentry Gateway |  | San Antonio, Texas |  | 1/31/2012 |  | 1 |  | 95,000 |  | 13,500 |  | 1,750 |
222 and 224 Schilling Circle |  | Hunt Valley, Maryland |  | 2/10/2012 |  | 2 |  | 56,000 |  | 4,400 |  | 202 |
|  |  |  |  |  | 8 |  | 314,000 |  | $ | 37,000 |  | $ | 4,397 |
(1) Includes three properties comprising the White Marsh Professional Center, 8615 Ridgely’s Choice and 8114 Sandpiper Circle.

X
- Definition Tabular disclosure of net operating properties that includes carrying amount of properties and accumulated depreciation. + References No definition available. + Details
Name: | ofc_ScheduleOfOperatingPropertiesTableTextBlock
Namespace Prefix: | ofc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information pertaining to operating property dispositions during the period, by disposition. + References No definition available. + Details
Name: | ofc_ScheduleOfOperatingPropertyDispositionsTableTextBlock
Namespace Prefix: | ofc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of properties in development or held for future development, which includes amount of land and costs incurred for construction and development. + References No definition available. + Details
Name: | ofc_ScheduleOfProjectsInDevelopmentOrHeldForFutureDevelopmentTableTextBlock
Namespace Prefix: | ofc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration