Real Estate Properties - Schedule of Property Sales (Details) (USD $) In Thousands, unless otherwise specified
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1 Months Ended |
12 Months Ended |
1 Months Ended |
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Jan. 31, 2013
building
property
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Dec. 31, 2014
sqft
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Dec. 31, 2013
sqft
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Dec. 31, 2012
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Dec. 31, 2013
property
building
sqft
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Jun. 30, 2013
property
building
sqft
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Sep. 30, 2012
building
property
sqft
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Jun. 30, 2012
property
building
sqft
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Apr. 30, 2012
property
building
sqft
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Mar. 31, 2013
building
property
sqft
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Oct. 31, 2013
building
property
sqft
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Aug. 31, 2013
property
building
sqft
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May 31, 2013
property
building
sqft
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Apr. 30, 2013
building
property
sqft
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Jun. 30, 2014
property
sqft
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Nov. 30, 2013
property
building
sqft
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Mar. 31, 2014
sqft
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Real Estate Properties [Line Items] |
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Number of Properties |
3eqc_NumberOfPropertiesSold |
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Number of Buildings |
18eqc_NumberOfBuildingsSold |
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Square Feet |
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42,919,000us-gaap_AreaOfRealEstateProperty |
42,915,000us-gaap_AreaOfRealEstateProperty |
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42,915,000us-gaap_AreaOfRealEstateProperty |
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Gain (Loss) on Sale |
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$ 0us-gaap_GainLossOnSaleOfProperties |
$ 1,596us-gaap_GainLossOnSaleOfProperties |
$ 0us-gaap_GainLossOnSaleOfProperties |
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CBD and suburban properties |
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Real Estate Properties [Line Items] |
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Square Feet |
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5,641,450us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember |
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5,641,450us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember |
Sales of properties resulting in gains and losses |
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Real Estate Properties [Line Items] |
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Number of Properties |
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7eqc_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
3eqc_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Number of Buildings |
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59eqc_NumberOfBuildingsSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
0eqc_NumberOfBuildingsSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Square Feet |
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2,760,235us-gaap_AreaOfRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
298,762us-gaap_AreaOfRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
2,760,235us-gaap_AreaOfRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales Price |
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105,207eqc_RealEstateAggregateSalesPrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
11,725eqc_RealEstateAggregateSalesPrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Gain (Loss) on Sale |
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(20,566)us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
2,039us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales of properties resulting in gains and losses | Suburban property |
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Real Estate Properties [Line Items] |
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Number of Properties |
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3eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Number of Buildings |
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40eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
0eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
0eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
0eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Square Feet |
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1,670,104us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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1,670,104us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
30,105us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
208,850us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
76,978us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
12,934us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales Price |
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89,000eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1,600eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
9,900eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1,250eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
575eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Gain (Loss) on Sale |
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(25,521)us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
317us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
1,689us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
192us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
158us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales of properties resulting in gains and losses | Land parcel |
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Real Estate Properties [Line Items] |
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Number of Properties |
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0eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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0eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Number of Buildings |
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0eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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0eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Square Feet |
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0us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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0us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales Price |
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2,551eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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1,806eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Gain (Loss) on Sale |
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1,765us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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1,596us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_LandParcelMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales of properties resulting in gains and losses | Suburban office and industrial properties |
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Real Estate Properties [Line Items] |
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Number of Properties |
3eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanOfficeAndIndustrialPropertiesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Number of Buildings |
18eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanOfficeAndIndustrialPropertiesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Square Feet |
1,060,026us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanOfficeAndIndustrialPropertiesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales Price |
10,250eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanOfficeAndIndustrialPropertiesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Gain (Loss) on Sale |
1,277us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanOfficeAndIndustrialPropertiesMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertiesResultinginGainsandLossesMember |
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Sales of properties with previously recorded asset impairment losses |
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Real Estate Properties [Line Items] |
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Number of Properties |
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36eqc_NumberOfPropertiesSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Number of Buildings |
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75eqc_NumberOfBuildingsSold / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Square Feet |
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5,583,720us-gaap_AreaOfRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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5,583,720us-gaap_AreaOfRealEstateProperty / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales Price |
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143,925eqc_RealEstateAggregateSalesPrice / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Gain (Loss) on Sale |
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0us-gaap_GainLossOnSaleOfProperties / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales of properties with previously recorded asset impairment losses | Suburban property |
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Real Estate Properties [Line Items] |
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Number of Properties |
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2eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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9eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Number of Buildings |
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2eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
2eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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41eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
3eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
1eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
1eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Square Feet |
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77,394us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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77,394us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
356,045us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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1,211,536us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
129,452us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
57,250us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
618,000us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales Price |
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2,020eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
16,300eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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43,000eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
4,100eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
4,025eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
830eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Gain (Loss) on Sale |
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0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyOneMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales of properties with previously recorded asset impairment losses | Suburban property |
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Real Estate Properties [Line Items] |
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Number of Properties |
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1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Number of Buildings |
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1eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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1eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Square Feet |
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143,802us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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665,545us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales Price |
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5,250eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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13,900eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Gain (Loss) on Sale |
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0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyTwoMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales of properties with previously recorded asset impairment losses | Suburban property |
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Real Estate Properties [Line Items] |
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Number of Properties |
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1eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyThreeMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Number of Buildings |
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2eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyThreeMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Square Feet |
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199,418us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyThreeMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales Price |
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4,000eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyThreeMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Gain (Loss) on Sale |
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0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_SuburbanPropertyThreeMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales of properties with previously recorded asset impairment losses | CBD and suburban properties |
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Real Estate Properties [Line Items] |
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Number of Properties |
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14eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
18eqc_NumberOfPropertiesSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
|
Number of Buildings |
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|
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43eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
21eqc_NumberOfBuildingsSold / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Square Feet |
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2,784,098us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
2,125,278us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Sales Price |
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215,900eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
50,500eqc_RealEstateAggregateSalesPrice / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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Gain (Loss) on Sale |
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$ 0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
$ 0us-gaap_GainLossOnSaleOfProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = eqc_CentralBusinessDistrictAndSuburbanPropertyMember / us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis = eqc_SaleofPropertieswithPreviouslyRecordedAssetImpairmentLossesMember |
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