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Business	3 Months Ended
Business	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	Business Equity Commonwealth, or the Company, is a real estate investment trust, or REIT, formed in 1986 under the laws of the State of Maryland. Our business is primarily the ownership and operation of office properties in the United States. The Company operates in an umbrella partnership real estate investment trust, or UPREIT, and conducts substantially all of its activities through EQC Operating Trust, a Maryland real estate investment trust, or the Operating Trust. The Company beneficially owned 99.68% of the outstanding shares of beneficial interest, designated as units, in the Operating Trust, or OP Units, as of March 31, 2023, and the Company is the sole trustee of the Operating Trust. As the sole trustee, the Company generally has the power under the declaration of trust of the Operating Trust to manage and conduct the business of the Operating Trust, subject to certain limited approval and voting rights of other holders of OP Units. At March 31, 2023, our portfolio consisted of four properties (eight buildings), with a combined 1.5 million square feet, and we had $2.1 billion of cash and cash equivalents.