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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2013
partners
sqft
Apr. 10, 2014
floor
sqft
Feb. 26, 2013
Oct. 30, 2014
floor
Oct. 09, 2013
sqft
Feb. 07, 2014
Nov. 05, 2014
Jul. 03, 2014
Noncontrolling Interest [Line Items]                      
Noncontrolling interest in property partnerships recorded upon consolidation $ 0us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination $ 480,861,000us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination $ 0us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination                
Property partnerships 1,602,467,000us-gaap_MinorityInterestInLimitedPartnerships 726,132,000us-gaap_MinorityInterestInLimitedPartnerships                  
767 5th Avenue (The General Motors Building) [Member]                      
Noncontrolling Interest [Line Items]                      
Net Rentable Area       1,800,000us-gaap_NetRentableArea
/ us-gaap_BusinessAcquisitionAxis
= bxp_SevenSixtySevenFifthAvenueTheGMBuildingMember		              
Number of Joint Venture Partners       2bxp_NumberofJointVenturePartners
/ us-gaap_BusinessAcquisitionAxis
= bxp_SevenSixtySevenFifthAvenueTheGMBuildingMember		              
Noncontrolling interest in property partnerships recorded upon consolidation       480,861,000us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_BusinessAcquisitionAxis
= bxp_SevenSixtySevenFifthAvenueTheGMBuildingMember		              
767 5th Avenue (The General Motors Building) [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Partners Joint Venture Ownership Percentage       40.00%bxp_PartnersJointVentureOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= bxp_SevenSixtySevenFifthAvenueTheGMBuildingMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember		              
Noncontrolling interest in property partnerships recorded upon consolidation       480,900,000us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_BusinessAcquisitionAxis
= bxp_SevenSixtySevenFifthAvenueTheGMBuildingMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember		              
767 5th Avenue (The General Motors Building) [Member]                      
Noncontrolling Interest [Line Items]                      
Number of Joint Venture Partners       2bxp_NumberofJointVenturePartners
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= bxp_SevenSixtySevenFifthAvenueTheGMBuildingMember		              
Noncontrolling Interests [Member]                      
Noncontrolling Interest [Line Items]                      
Noncontrolling interest in property partnerships recorded upon consolidation   480,861,000us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		                  
Noncontrolling Interests [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Net Rentable Area               1,246,000us-gaap_NetRentableArea
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		      
Number of Joint Venture Partners       2bxp_NumberofJointVenturePartners
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		              
Noncontrolling Interests [Member] | 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Ownership Percentage             45.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Sale Price Of Sold Property             1,827,000,000bxp_SalePriceOfSoldProperty
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Disposal Group, Including Discontinued Operation, Secured Debt             712,900,000bxp_DisposalGroupIncludingDiscontinuedOperationSecuredDebt
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Proceeds from sale of an interest in a real estate asset             1,497,000,000bxp_Proceedsfromsaleofaninterestinarealestateasset
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Difference between net cash proceeds received and noncontrolling interest recognized             648,400,000bxp_Differencebetweennetcashproceedsreceivedandnoncontrollinginterestrecognized
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Noncontrolling Interests [Member] | Time Square Tower [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
ownership interest sold (percent)               45.00%bxp_Ownershipinterestsoldpercent
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_TimeSquareTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		      
Net Contractual Sales Price               684,000,000bxp_NetContractualSalesPrice
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_TimeSquareTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		      
Proceeds from sale of an interest in a real estate asset               673,100,000bxp_Proceedsfromsaleofaninterestinarealestateasset
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_TimeSquareTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		      
Portion allocation to noncontrolling interest based on carrying value of the total equity of the property prior to the sale               243,500,000bxp_Portionallocationtononcontrollinginterestbasedoncarryingvalueofthetotalequityofthepropertypriortothesale
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_TimeSquareTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		      
Difference between net cash proceeds received and noncontrolling interest recognized               429,600,000bxp_Differencebetweennetcashproceedsreceivedandnoncontrollinginterestrecognized
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_TimeSquareTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		      
Salesforce Tower [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Ownership Percentage by Parent         95.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember		            
Number of floors in building         61bxp_NumberOfFloorsRealEstate
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember		            
Area of Real Estate Property         1,400,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember		            
Salesforce Tower [Member] | Noncontrolling Interests [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
maximum percentage of construction costs to allow partner to have a loan           50.00%bxp_Maximumpercentageofconstructioncoststoallowpartnertohavealoan
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		          
Ownership Percentage           5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		     50.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		    
Ownership Percentage by Parent           95.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		          
Portion of total costs partner can require the company to fund           2.50%bxp_Portionoftotalcostspartnercanrequirethecompanytofund
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		          
portion of partners equity that can be funded by the company           50.00%bxp_Portionofpartnersequitythatcanbefundedbythecompany
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SalesforceTowerMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		          
One Hundred Federal Street [Member] | Noncontrolling Interests [Member] | 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Area of Real Estate Property             1,323,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_OneHundredFederalStreetMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
601 Lexington Avenue [Member] | Noncontrolling Interests [Member] | 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Area of Real Estate Property             1,669,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SixZeroOneLexingtonAvenueMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Atlantic Wharf Office [Member] | Noncontrolling Interests [Member] | 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Area of Real Estate Property             791,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_AtlanticWharfOfficeMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Low Rise [Member] | 601 Lexington Avenue [Member] | Noncontrolling Interests [Member] | 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Number of floors in building             6bxp_NumberOfFloorsRealEstate
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ bxp_LocationinbuildingAxis
= bxp_LowRiseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SixZeroOneLexingtonAvenueMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Office Tower [Member] | 601 Lexington Avenue [Member] | Noncontrolling Interests [Member] | 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street [Member] | Consolidated Properties [Member]                      
Noncontrolling Interest [Line Items]                      
Number of floors in building             59bxp_NumberOfFloorsRealEstate
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= bxp_SixZeroOneLexingtonAvenueAtlanticWharfOfficeBuildingandOneHundredFederalStreetMember
/ bxp_LocationinbuildingAxis
= bxp_OfficeTowerMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= bxp_SixZeroOneLexingtonAvenueMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_ConsolidatedPropertiesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		        
Series Four Preferred Units [Member] | Noncontrolling Interests [Member]                      
Noncontrolling Interest [Line Items]                      
Redemption of Series Four Preferred Units                   $ 1,400,000bxp_RedemptionofSeriesFourPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= bxp_SeriesFourPreferredUnitsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember		 $ 16,000,000bxp_RedemptionofSeriesFourPreferredUnits
/ us-gaap_StatementClassOfStockAxis
= bxp_SeriesFourPreferredUnitsMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember