Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

 v2.3.0.11
Document and Entity Information
6 Months Ended
Jun. 30, 2011
Jul. 18, 2011
Document and Entity Information    
Entity Registrant Name CORPORATE OFFICE PROPERTIES TRUST  
Entity Central Index Key 0000860546  
Document Type 10-Q  
Document Period End Date Jun. 30, 2011
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   71,912,302
Document Fiscal Year Focus 2011  
Document Fiscal Period Focus Q2