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Organization | 3 Months Ended
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Mar. 31, 2012
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1. Organization Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company,” “we” or “us”) is a fully-integrated and self-managed real estate investment trust (“REIT”) that focuses primarily on serving the specialized requirements of strategic customers in the United States Government and defense information technology sectors. We acquire, develop, manage and lease office and data center properties that are typically concentrated in large office parks primarily located adjacent to government demand drivers and/or in office markets that we believe possess growth opportunities. As of March 31, 2012, our investments in real estate included the following: · 231 operating office properties totaling 20.2 million square feet; · seven office properties under construction or redevelopment that we estimate will total approximately 903,000 square feet upon completion, including two partially operational properties included above; · land held or under pre-construction totaling 2,327 acres (including 583 controlled but not owned) that we believe are potentially developable into approximately 20.5 million square feet; and · a partially operational, wholesale data center which upon completion and stabilization is expected to have a critical load of 18 megawatts. We conduct almost all of our operations through our operating partnership, Corporate Office Properties, L.P. (the “Operating Partnership”), of which we are the managing general partner. The Operating Partnership owns real estate both directly and through subsidiary partnerships and limited liability companies (“LLCs”). A summary of our Operating Partnership’s forms of ownership and the percentage of those ownership forms owned by COPT as of March 31, 2012 follows:
Common Units |  | 94 | %
Series G Preferred Units |  | 100 | %
Series H Preferred Units |  | 100 | %
Series I Preferred Units |  | 0 | %
Series J Preferred Units |  | 100 | %
Series K Preferred Units |  | 100 | %
Three of our trustees also controlled, either directly or through ownership by other entities or family members, an additional 5% of the Operating Partnership’s common units (“common units”) as of March 31, 2012. In addition to owning real estate, the Operating Partnership also owns entities that provide real estate services such as property management and construction and development services primarily for our properties but also for third parties.

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- Definition The entire disclosure for the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Name Statement of Position (SOP) -Publisher AICPA -Number 94-6 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6003-108592 + Details
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