$BXP
BXP Inc Stock $bxp

$bxp Overview Financials Valuation SEC Filings Company Website

2021 Form 10-K Financial Statement

#000165642322000013 Filed on February 25, 2022

Income Statement

Concept	2021	2020 Q4	2020
Revenue	$2.889B	$665.1M	$2.766B
YoY Change	4.45%	-12.2%	-6.58%
Cost Of Revenue	$1.047B	$260.4M	$1.042B
YoY Change	0.44%	-6.8%	-4.79%
Gross Profit	$1.814B	$404.7M	$1.694B
YoY Change	7.1%	-15.35%	-7.23%
Gross Profit Margin	62.81%	60.85%	61.25%
Selling, General & Admin	$151.6M	$31.10M	$133.1M
YoY Change	13.88%	-5.18%	-5.47%
% of Gross Profit	8.35%	7.68%	7.86%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$717.3M	$168.1M	$683.8M
YoY Change	4.91%	-1.06%	0.88%
% of Gross Profit	39.54%	41.54%	40.36%
Operating Expenses	$868.9M	$199.0M	$816.9M
YoY Change	6.37%	-1.83%	-0.2%
Operating Profit	$945.4M	$205.7M	$877.2M
YoY Change	7.78%	-25.31%	-12.95%
Interest Expense	$423.3M	-$185.7M	$431.7M
YoY Change	-1.94%	91.05%	4.6%
% of Operating Profit	44.78%	-90.28%	49.22%
Other Income/Expense, Net
YoY Change
Pretax Income	$631.9M	$24.90M	$1.019B
YoY Change	-37.97%	-85.85%	56.24%
Income Tax
% Of Pretax Income
Net Earnings	$505.2M	$10.30M	$872.7M
YoY Change	-42.11%	-92.69%	67.34%
Net Earnings / Revenue	17.49%	1.55%	31.56%
Basic Earnings Per Share	$3.18		$5.55
Diluted Earnings Per Share	$3.17	$66.15K	$5.54
COMMON SHARES
Basic Shares Outstanding	156.1M shares	155.7M shares	155.4M shares
Diluted Shares Outstanding	156.4M shares		155.5M shares

Balance Sheet

Concept	2021	2020 Q4	2020
SHORT-TERM ASSETS
Cash & Short-Term Investments	$452.7M	$1.708B	$1.669B
YoY Change	-72.88%	150.58%	158.76%
Cash & Equivalents	$452.7M	$1.669B	$1.669B
Short-Term Investments		$39.46M
Other Short-Term Assets	$57.81M	$34.00M	$34.00M
YoY Change	70.03%	-19.05%	-19.05%
Inventory
Prepaid Expenses
Receivables	$70.19M	$77.00M	$77.00M
Other Receivables	$1.227B	$1.123B	$1.123B
Total Short-Term Assets	$1.807B	$2.903B	$2.903B
YoY Change	-37.74%	57.86%	57.86%
LONG-TERM ASSETS
Property, Plant & Equipment	$18.28B	$17.82B	$17.82B
YoY Change	2.56%	1.12%	1.12%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$1.527B	$1.350B	$1.350B
YoY Change	13.08%	36.09%	36.09%
Other Assets	$667.3M	$691.0M	$691.0M
YoY Change	-3.44%	-6.11%	-6.11%
Total Long-Term Assets	$20.56B	$19.96B	$19.96B
YoY Change	3.02%	2.62%	2.62%
TOTAL ASSETS
Total Short-Term Assets	$1.807B	$2.903B	$2.903B
Total Long-Term Assets	$20.56B	$19.96B	$19.96B
Total Assets	$22.37B	$22.86B	$22.86B
YoY Change	-2.16%	7.39%	7.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$320.8M	$336.0M	$336.0M
YoY Change	-4.53%	-11.11%	-11.11%
Accrued Expenses	$299.4M	$308.0M	$308.0M
YoY Change	-2.81%	6.21%	6.21%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$790.0M	$815.0M	$815.0M
YoY Change	-3.07%	-2.86%	-2.86%
LONG-TERM LIABILITIES
Long-Term Debt	$13.14B	$13.28B	$13.28B
YoY Change	-1.08%	10.37%	10.37%
Other Long-Term Liabilities	$401.0M	$419.0M	$419.0M
YoY Change	-4.29%	5.81%	5.81%
Total Long-Term Liabilities	$13.54B	$13.70B	$13.70B
YoY Change	-1.17%	10.22%	10.22%
TOTAL LIABILITIES
Total Short-Term Liabilities	$790.0M	$815.0M	$815.0M
Total Long-Term Liabilities	$13.54B	$13.70B	$13.70B
Total Liabilities	$16.53B	$14.51B	$16.86B
YoY Change	-1.96%	9.42%	8.09%
SHAREHOLDERS EQUITY
Retained Earnings		-$509.7M
YoY Change		-32.99%
Common Stock		$1.557M
YoY Change		0.58%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$2.722M
YoY Change		0.0%
Treasury Stock Shares		78.90K shares
Shareholders Equity	$5.834B	$5.996B	$5.996B
YoY Change
Total Liabilities & Shareholders Equity	$22.37B	$22.86B	$22.86B
YoY Change	-2.16%	7.39%	7.39%

Cashflow Statement

Concept	2021	2020 Q4	2020
OPERATING ACTIVITIES
Net Income	$505.2M	$10.30M	$872.7M
YoY Change	-42.11%	-92.69%	67.34%
Depreciation, Depletion And Amortization	$717.3M	$168.1M	$683.8M
YoY Change	4.91%	-1.06%	0.88%
Cash From Operating Activities	$1.133B	$374.4M	$1.157B
YoY Change	-2.04%	3.6%	-2.06%
INVESTING ACTIVITIES
Capital Expenditures	-$1.151B	-$231.2M	-$1.015B
YoY Change	13.41%	-13.54%	-9.98%
Acquisitions	$0.00
YoY Change
Other Investing Activities	$111.1M	$5.900M	$0.00
YoY Change		-152.68%
Cash From Investing Activities	-$1.040B	-$225.3M	-$613.7M
YoY Change	69.45%	-19.13%	-39.54%
FINANCING ACTIVITIES
Cash Dividend Paid	$683.8M		$688.9M
YoY Change	-0.75%		3.39%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-$1.311B	-194.6M	$484.3M
YoY Change	-370.78%	-0.51%	-527.17%
NET CHANGE
Cash From Operating Activities	$1.133B	374.4M	$1.157B
Cash From Investing Activities	-$1.040B	-225.3M	-$613.7M
Cash From Financing Activities	-$1.311B	-194.6M	$484.3M
Net Change In Cash	-$1.218B	-45.50M	$1.027B
YoY Change	-218.56%	-59.66%	1849.79%
FREE CASH FLOW
Cash From Operating Activities	$1.133B	$374.4M	$1.157B
Capital Expenditures	-$1.151B	-$231.2M	-$1.015B
Free Cash Flow	$2.284B	$605.6M	$2.172B
YoY Change	5.18%	-3.69%	-5.93%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2021	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
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CY2021	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2021	dei	Amendment Flag AmendmentFlag	false
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CY2021	dei	Document Annual Report DocumentAnnualReport	true
CY2021	dei	Document Period End Date DocumentPeriodEndDate	2021-12-31
CY2021	dei	Document Transition Report DocumentTransitionReport	false
CY2021	dei	Entity File Number EntityFileNumber	1-13087
CY2021	dei	Entity Registrant Name EntityRegistrantName	BOSTON PROPERTIES, INC.
CY2021	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
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CY2021	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	04-2473675
CY2021	dei	Entity Address Address Line1 EntityAddressAddressLine1	Prudential Center, 800 Boylston Street, Suite 1900
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CY2021	dei	Local Phone Number LocalPhoneNumber	236-3300
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CY2021	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2021	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2021	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2021	dei	Entity Small Business EntitySmallBusiness	false
CY2021	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2021	dei	Auditor Firm AuditorFirmId	238
CY2021	dei	Auditor Name AuditorName	PricewaterhouseCoopers LLP
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CY2021	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2020	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2019	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	24038000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-45182000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-29540000	USD
CY2021	us-gaap	Interest Expense InterestExpense	423346000	USD
CY2020	us-gaap	Interest Expense InterestExpense	431717000	USD
CY2019	us-gaap	Interest Expense InterestExpense	412717000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	631932000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1018691000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	651999000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Limited Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable	70806000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Limited Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable	48260000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Limited Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable	71120000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	55931000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	97704000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	59345000	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	505195000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	872727000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	521534000	USD
CY2021	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	2560000	USD
CY2020	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	10500000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	10500000	USD
CY2021	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	6412000	USD
CY2020	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	USD
CY2019	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	0	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	496223000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	862227000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	511034000	USD
CY2021	bxp	Earnings Per Share After Allocation Of Undistributed Earnings To Participating Securities Basic Dollars Per Share EarningsPerShareAfterAllocationOfUndistributedEarningsToParticipatingSecuritiesBasicDollarsPerShare	3.18
CY2020	bxp	Earnings Per Share After Allocation Of Undistributed Earnings To Participating Securities Basic Dollars Per Share EarningsPerShareAfterAllocationOfUndistributedEarningsToParticipatingSecuritiesBasicDollarsPerShare	5.54
CY2019	bxp	Earnings Per Share After Allocation Of Undistributed Earnings To Participating Securities Basic Dollars Per Share EarningsPerShareAfterAllocationOfUndistributedEarningsToParticipatingSecuritiesBasicDollarsPerShare	3.31
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	156116000	shares
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	155432000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	154582000	shares
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.17
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.54
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.30
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	156376000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	155517000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	154883000	shares
CY2021	us-gaap	Profit Loss ProfitLoss	631932000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1018691000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	651999000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	8544000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-7848000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6751000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6704000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6697000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6664000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	15248000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1151000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-87000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	647180000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1017540000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	651912000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	126737000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	145964000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	130465000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	2020000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	404000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	507000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	518423000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	871172000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	520940000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8213968000	USD
CY2019	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2019	bxp	Equity Profit Loss EquityProfitLoss	651999000	USD
CY2019	us-gaap	Dividends Dividends	-671893000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	688000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	45000000	USD
CY2019	bxp	Saleofaninterestinpropertypartnerships Saleofaninterestinpropertypartnerships	0	USD
CY2019	bxp	Difference Between Purchase Price And Carrying Value DifferenceBetweenPurchasePriceAndCarryingValue	-186963000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	35816000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Joint Venture Partners Nonredeemable NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable	69913000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-6751000	USD
CY2019	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	6664000	USD
CY2019	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8014236000	USD
CY2020	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2020	bxp	Equity Profit Loss EquityProfitLoss	1018691000	USD
CY2020	us-gaap	Dividends Dividends	-689273000	USD
CY2020	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	759000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	48621000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	8219000	USD
CY2020	us-gaap	Noncontrolling Interest In Net Income Loss Joint Venture Partners Nonredeemable NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable	-58811000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-7848000	USD
CY2020	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	6697000	USD
CY2020	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8339612000	USD
CY2021	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2021	bxp	Equity Profit Loss EquityProfitLoss	631932000	USD
CY2021	us-gaap	Dividends Dividends	-683843000	USD
CY2021	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1004000	USD
CY2021	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	71383000	USD
CY2021	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	99689000	USD
CY2021	us-gaap	Proceeds From Repurchase Of Redeemable Preferred Stock ProceedsFromRepurchaseOfRedeemablePreferredStock	193623000	USD
CY2021	us-gaap	Preferred Stock Redemption Premium PreferredStockRedemptionPremium	6412000	USD
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	18002000	USD
CY2021	us-gaap	Noncontrolling Interest In Net Income Loss Joint Venture Partners Nonredeemable NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable	-259764000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	8544000	USD
CY2021	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	6704000	USD
CY2021	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8033228000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	631932000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	1018691000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	651999000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	717336000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	683751000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	677764000	USD
CY2021	bxp	Amortizationofrightofuseassetoperatingleases Amortizationofrightofuseassetoperatingleases	3516000	USD
CY2020	bxp	Amortizationofrightofuseassetoperatingleases Amortizationofrightofuseassetoperatingleases	2234000	USD
CY2019	bxp	Amortizationofrightofuseassetoperatingleases Amortizationofrightofuseassetoperatingleases	2412000	USD
CY2021	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2020	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2019	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	24038000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	50860000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	44142000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	40958000	USD
CY2021	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-2570000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-85110000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	46592000	USD
CY2021	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	21542000	USD
CY2020	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	31892000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	17155000	USD
CY2021	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	5626000	USD
CY2020	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	5261000	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	6417000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-1207000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1849000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	0	USD
CY2021	us-gaap	Paid In Kind Interest PaidInKindInterest	23368000	USD
CY2020	us-gaap	Paid In Kind Interest PaidInKindInterest	23384000	USD
CY2019	us-gaap	Paid In Kind Interest PaidInKindInterest	22254000	USD
CY2021	us-gaap	Accretion Expense AccretionExpense	-8500000	USD
CY2020	us-gaap	Accretion Expense AccretionExpense	0	USD
CY2019	us-gaap	Accretion Expense AccretionExpense	-763000	USD
CY2021	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-45182000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-29540000	USD
CY2021	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	123660000	USD
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	618982000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	709000	USD
CY2021	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-4820000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-22550000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	24876000	USD
CY2021	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	545000	USD
CY2020	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	19000	USD
CY2019	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	-4000	USD
CY2021	us-gaap	Straight Line Rent StraightLineRent	101548000	USD
CY2020	us-gaap	Straight Line Rent StraightLineRent	97099000	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	56817000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	20811000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-12488000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2965000	USD
CY2021	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	568000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	0	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	23599000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	-1533000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	-1616000	USD
CY2021	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	20025000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-4059000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	12627000	USD
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-10839000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	16211000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	858000	USD
CY2021	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-28739000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	17629000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-49569000	USD
CY2021	us-gaap	Lease Cost LeaseCost	-62850000	USD
CY2020	us-gaap	Lease Cost LeaseCost	-79772000	USD
CY2019	us-gaap	Lease Cost LeaseCost	-117282000	USD
CY2021	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	501295000	USD
CY2020	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	138149000	USD
CY2019	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	529166000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1133227000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1156840000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1181165000	USD
CY2021	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	222260000	USD
CY2020	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	137976000	USD
CY2019	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	149031000	USD
CY2021	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	513878000	USD
CY2020	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	482507000	USD
CY2019	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	546060000	USD
CY2021	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	150998000	USD
CY2020	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	160126000	USD
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	180556000	USD
CY2021	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	263952000	USD
CY2020	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	234423000	USD
CY2019	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	251831000	USD
CY2021	bxp	Rightofuseassetsfinanceleases Rightofuseassetsfinanceleases	0	USD
CY2020	bxp	Rightofuseassetsfinanceleases Rightofuseassetsfinanceleases	0	USD
CY2019	bxp	Rightofuseassetsfinanceleases Rightofuseassetsfinanceleases	5152000	USD
CY2021	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	179887000	USD
CY2020	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	519303000	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	90824000	USD
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	98152000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	172436000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	87392000	USD
CY2021	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	122000	USD
CY2020	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	55298000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	136807000	USD
CY2021	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	0	USD
CY2020	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	24112000	USD
CY2021	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	0	USD
CY2020	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	9800000	USD
CY2019	us-gaap	Payments To Acquire Loans Receivable PaymentsToAcquireLoansReceivable	0	USD
CY2021	us-gaap	Proceeds From Mortgage Deposits ProceedsFromMortgageDeposits	10035000	USD
CY2020	us-gaap	Proceeds From Mortgage Deposits ProceedsFromMortgageDeposits	6397000	USD
CY2019	us-gaap	Proceeds From Mortgage Deposits ProceedsFromMortgageDeposits	-3544000	USD
CY2021	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	17789000	USD
CY2020	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2019	us-gaap	Proceeds From Sale Of Equity Method Investments ProceedsFromSaleOfEquityMethodInvestments	0	USD
CY2021	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	-1451000	USD
CY2020	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	-2551000	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	2132000	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1039956000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-613719000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1015091000	USD
CY2021	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	1201388000	USD
CY2020	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	0	USD
CY2019	us-gaap	Proceeds From Secured Notes Payable ProceedsFromSecuredNotesPayable	0	USD
CY2021	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	832296000	USD
CY2020	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	17168000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	46173000	USD
CY2021	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1695996000	USD
CY2020	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1248125000	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1548106000	USD
CY2021	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	1841500000	USD
CY2020	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	0	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	699237000	USD
CY2021	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	770000000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	265000000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	380000000	USD
CY2021	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	625000000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	265000000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	380000000	USD
CY2021	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	-500000000	USD
CY2020	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	0	USD
CY2019	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	0	USD
CY2021	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	200000000	USD
CY2020	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Redeemable Preferred Stock PaymentsForRepurchaseOfRedeemablePreferredStock	0	USD
CY2021	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	1250000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	502000	USD
CY2021	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	20757000	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	10416000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	13213000	USD
CY2021	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	-16186000	USD
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
CY2021	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	43036000	USD
CY2020	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	28716000	USD
CY2021	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	24214000	USD
CY2020	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	3277000	USD
CY2019	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	13710000	USD
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	683753000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	688904000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	666294000	USD
CY2021	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	18002000	USD
CY2020	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	8219000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	35816000	USD
CY2021	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	259764000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	58811000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	69913000	USD
CY2021	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	0	USD
CY2020	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	0	USD
CY2019	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-186963000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1311442000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	484322000	USD
CY2021Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	452692000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-113379000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-1218171000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1027443000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	52695000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1719329000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	691886000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	639191000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	501158000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1719329000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	691886000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1668742000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	644950000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	543359000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	50587000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	46936000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	95832000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1668742000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	644950000	USD
CY2021Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	48466000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	50587000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	46936000	USD
CY2021	us-gaap	Interest Paid InterestPaid	465442000	USD
CY2020	us-gaap	Interest Paid InterestPaid	433492000	USD
CY2019	us-gaap	Interest Paid InterestPaid	439059000	USD
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	53097000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	53881000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	54911000	USD
CY2021	bxp	Writeoffoffullydepreciatedrealestate Writeoffoffullydepreciatedrealestate	239317000	USD
CY2020	bxp	Writeoffoffullydepreciatedrealestate Writeoffoffullydepreciatedrealestate	99494000	USD
CY2019	bxp	Writeoffoffullydepreciatedrealestate Writeoffoffullydepreciatedrealestate	129831000	USD
CY2021	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	25183000	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	19848000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-89245000	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	26887000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	287540000	USD
CY2021	bxp	Prepaidrentreclassifiedtorightofuseasset Prepaidrentreclassifiedtorightofuseasset	0	USD
CY2020	bxp	Prepaidrentreclassifiedtorightofuseasset Prepaidrentreclassifiedtorightofuseasset	0	USD
CY2019	bxp	Prepaidrentreclassifiedtorightofuseasset Prepaidrentreclassifiedtorightofuseasset	15000000	USD
CY2021	bxp	Accruedrentalincomenetdeconsolidated Accruedrentalincomenetdeconsolidated	0	USD
CY2020	bxp	Accruedrentalincomenetdeconsolidated Accruedrentalincomenetdeconsolidated	4558000	USD
CY2019	bxp	Accruedrentalincomenetdeconsolidated Accruedrentalincomenetdeconsolidated	0	USD
CY2021	bxp	Transfer Of Tenant Lease Costs Real Estate TransferOfTenantLeaseCostsRealEstate	0	USD
CY2020	bxp	Transfer Of Tenant Lease Costs Real Estate TransferOfTenantLeaseCostsRealEstate	3462000	USD
CY2019	bxp	Transfer Of Tenant Lease Costs Real Estate TransferOfTenantLeaseCostsRealEstate	0	USD
CY2021	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2020	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	111889000	USD
CY2019	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	12767000	USD
CY2021	bxp	Transfer Of Tenant Improvements Real Estate TransferOfTenantImprovementsRealEstate	0	USD
CY2020	bxp	Transfer Of Tenant Improvements Real Estate TransferOfTenantImprovementsRealEstate	12331000	USD
CY2019	bxp	Transfer Of Tenant Improvements Real Estate TransferOfTenantImprovementsRealEstate	0	USD
CY2021	bxp	Construction In Progress Net Deconsolidated ConstructionInProgressNetDeconsolidated	-299947000	USD
CY2020	bxp	Construction In Progress Net Deconsolidated ConstructionInProgressNetDeconsolidated	0	USD
CY2019	bxp	Construction In Progress Net Deconsolidated ConstructionInProgressNetDeconsolidated	0	USD
CY2021	bxp	Prepaid Expenses And Other Assets Net Deconsolidated PrepaidExpensesAndOtherAssetsNetDeconsolidated	-5011000	USD
CY2020	bxp	Prepaid Expenses And Other Assets Net Deconsolidated PrepaidExpensesAndOtherAssetsNetDeconsolidated	0	USD
CY2019	bxp	Prepaid Expenses And Other Assets Net Deconsolidated PrepaidExpensesAndOtherAssetsNetDeconsolidated	0	USD
CY2021	bxp	Right Of Use Asset Finance Lease Deconsolidated RightOfUseAssetFinanceLeaseDeconsolidated	0	USD
CY2020	bxp	Right Of Use Asset Finance Lease Deconsolidated RightOfUseAssetFinanceLeaseDeconsolidated	0	USD
CY2019	bxp	Right Of Use Asset Finance Lease Deconsolidated RightOfUseAssetFinanceLeaseDeconsolidated	-135004000	USD
CY2021	bxp	Leaseliabilityfinanceleasedeconsolidation Leaseliabilityfinanceleasedeconsolidation	0	USD
CY2020	bxp	Leaseliabilityfinanceleasedeconsolidation Leaseliabilityfinanceleasedeconsolidation	0	USD
CY2019	bxp	Leaseliabilityfinanceleasedeconsolidation Leaseliabilityfinanceleasedeconsolidation	-119534000	USD
CY2021	us-gaap	Transfer To Investments TransferToInvestments	107132000	USD
CY2020	us-gaap	Transfer To Investments TransferToInvestments	347898000	USD
CY2019	us-gaap	Transfer To Investments TransferToInvestments	29246000	USD
CY2021	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	99689000	USD
CY2020	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2019	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2021	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	200311000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Debt Assumed1 NoncashOrPartNoncashAcquisitionDebtAssumed1	0	USD
CY2021	bxp	Mortgage Notes Payable Deconsolidated MortgageNotesPayableDeconsolidated	-198381000	USD
CY2020	bxp	Mortgage Notes Payable Deconsolidated MortgageNotesPayableDeconsolidated	0	USD
CY2019	bxp	Mortgage Notes Payable Deconsolidated MortgageNotesPayableDeconsolidated	0	USD
CY2021Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	169859000	USD
CY2020Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	171082000	USD
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	170713000	USD
CY2021	bxp	Conversions Of Noncontrolling Interests To Stockholders Equity ConversionsOfNoncontrollingInterestsToStockholdersEquity	18386000	USD
CY2020	bxp	Conversions Of Noncontrolling Interests To Stockholders Equity ConversionsOfNoncontrollingInterestsToStockholdersEquity	29698000	USD
CY2019	bxp	Conversions Of Noncontrolling Interests To Stockholders Equity ConversionsOfNoncontrollingInterestsToStockholdersEquity	4885000	USD
CY2021	bxp	Issuance Of Restricted Securities To Employees And Directors IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors	44405000	USD
CY2020	bxp	Issuance Of Restricted Securities To Employees And Directors IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors	42607000	USD
CY2019	bxp	Issuance Of Restricted Securities To Employees And Directors IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors	37622000	USD
CY2021Q4	bxp	Restriction On Redemption Of Op Units From Date Of Issuance In Years RestrictionOnRedemptionOfOpUnitsFromDateOfIssuanceInYears	1	Y
CY2021Q4	bxp	Op Unit Conversion Rate OpUnitConversionRate	1	shares
CY2021Q4	bxp	Common Stock Conversion Rate CommonStockConversionRate	1	shares
CY2021Q4	bxp	Op Unit Conversion Rate OpUnitConversionRate	1	shares
CY2020Q4	bxp	Number Of Series Of Preferred Units Outstanding NumberOfSeriesOfPreferredUnitsOutstanding	1
CY2021Q4	bxp	Numberof Vi Es NumberofVIEs	6
CY2021Q4	bxp	Numberof Vi Es Total NumberofVIEsTotal	7
CY2021Q4	bxp	Numberof Vi Es NumberofVIEs	6
CY2021	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	53100000	USD
CY2020	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	53900000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	54900000	USD
CY2021	bxp	Salaries And Related Costs Capitalized SalariesAndRelatedCostsCapitalized	13700000	USD
CY2020	bxp	Salaries And Related Costs Capitalized SalariesAndRelatedCostsCapitalized	12900000	USD
CY2019	bxp	Salaries And Related Costs Capitalized SalariesAndRelatedCostsCapitalized	10400000	USD
CY2021Q4	bxp	Cash Fdic Insured Limit CashFDICInsuredLimit	250000	USD
CY2021Q4	bxp	Separate Unrestricted Cash For Deferred Compensation Plan SeparateUnrestrictedCashForDeferredCompensationPlan	43600000	USD
CY2020Q4	bxp	Separate Unrestricted Cash For Deferred Compensation Plan SeparateUnrestrictedCashForDeferredCompensationPlan	39500000	USD
CY2021	us-gaap	Gain Loss On Investments GainLossOnInvestments	5600000	USD
CY2020	us-gaap	Gain Loss On Investments GainLossOnInvestments	5300000	USD
CY2019	us-gaap	Gain Loss On Investments GainLossOnInvestments	6400000	USD
CY2021	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	104300000	USD
CY2020	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	104900000	USD
CY2019	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	58400000	USD
CY2021	bxp	Above And Below Market Rent Adjustments AboveAndBelowMarketRentAdjustments	4200000	USD
CY2020	bxp	Above And Below Market Rent Adjustments AboveAndBelowMarketRentAdjustments	6500000	USD
CY2019	bxp	Above And Below Market Rent Adjustments AboveAndBelowMarketRentAdjustments	20900000	USD
CY2020Q4	bxp	Real Estate Investment Property At Cost Including Rightof Use Assets RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets	23352909000	USD
CY2021Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	5883961000	USD
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-top:14pt;text-indent:11.25pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Reclassification</span></div><div style="margin-top:5pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior year amounts have been reclassified to conform to the current year presentation.</span></div>
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:14pt;text-indent:11.25pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Use of Estimates in the Preparation of Financial Statements</span></div><div style="margin-top:5pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. These estimates include such items as depreciation and allowances for doubtful accounts. Actual results could differ from those estimates.</span></div><div style="margin-top:9pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as COVID-19, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.</span></div>
CY2020Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	17818807000	USD
CY2021	bxp	Dividends Treatment For Federal Tax Purposes DividendsTreatmentForFederalTaxPurposes	3.92
CY2021	bxp	Dividends Treatment For Federal Tax Purposes Percentage DividendsTreatmentForFederalTaxPurposesPercentage	1.0000
CY2020	bxp	Dividends Treatment For Federal Tax Purposes DividendsTreatmentForFederalTaxPurposes	3.88
CY2020	bxp	Dividends Treatment For Federal Tax Purposes Percentage DividendsTreatmentForFederalTaxPurposesPercentage	1.0000
CY2019	bxp	Dividends Treatment For Federal Tax Purposes DividendsTreatmentForFederalTaxPurposes	3.15
CY2019	bxp	Dividends Treatment For Federal Tax Purposes Percentage DividendsTreatmentForFederalTaxPurposesPercentage	1.0000
CY2021Q4	us-gaap	Land Land	5061169000	USD
CY2020Q4	us-gaap	Land Land	5069206000	USD
CY2020Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	5534102000	USD
CY2021Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	18275954000	USD
CY2021	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1300000	USD
CY2020	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	90300000	USD
CY2021Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	237507000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	237393000	USD
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	169778000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	146406000	USD
CY2021Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	560355000	USD
CY2020Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	450954000	USD
CY2021Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	14291214000	USD
CY2020Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	13777691000	USD
CY2021Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	2894025000	USD
CY2020Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	2752880000	USD
CY2021Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	51695000	USD
CY2020Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	49606000	USD
CY2021Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	894172000	USD
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	868773000	USD
CY2021Q4	bxp	Real Estate Investment Property At Cost Including Rightof Use Assets RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets	24159915000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P50Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P51Y
CY2021Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P69Y
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P70Y
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.057
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.057
CY2021Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.062
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.062
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	19623000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	8762000	USD
CY2019Q4	us-gaap	Number Of Properties Subject To Ground Leases NumberOfPropertiesSubjectToGroundLeases	4
CY2021Q4	us-gaap	Number Of Properties Subject To Ground Leases NumberOfPropertiesSubjectToGroundLeases	4
CY2020Q4	us-gaap	Number Of Properties Subject To Ground Leases NumberOfPropertiesSubjectToGroundLeases	4
CY2021	us-gaap	Operating Lease Cost OperatingLeaseCost	13151000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	13948000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	14573000	USD
CY2021	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	547000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	56000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	29000	USD
CY2021	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	2471000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	583000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	47000	USD
CY2021Q4	bxp	Finance Leases Under Development FinanceLeasesUnderDevelopment	2
CY2020Q4	bxp	Finance Leases Under Development FinanceLeasesUnderDevelopment	3
CY2019Q4	bxp	Finance Leases Under Development FinanceLeasesUnderDevelopment	3
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	10085000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	25333000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	10826000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	48605000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	10307000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	9971000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	10100000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	10166000	USD
CY2021Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	538801000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	1363011000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	614249000	USD
CY2021Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	1451341000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	-409688000	USD
CY2021Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	-1206920000	USD
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	204561000	USD
CY2021Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	244421000	USD
CY2021Q4	bxp	Lessee Purchase Option Reasonably Certain Of Exercising LesseePurchaseOptionReasonablyCertainOfExercising	38700000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	25092000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	5896000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	18020000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	10206000	USD
CY2020Q4	bxp	Deferred Costs Gross DeferredCostsGross	1035786000	USD
CY2021Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	1011229000	USD
CY2020Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	1023058000	USD
CY2021Q4	us-gaap	Deferred Offering Costs DeferredOfferingCosts	19231000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	10262000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	9701000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	9277000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	48518000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	9476000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	9971000	USD
CY2020Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	548478000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	1373177000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	620605000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	1457469000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	-418892000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	-1220977000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	201713000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	236492000	USD
CY2020Q4	bxp	Lessee Purchase Option Reasonably Certain Of Exercising LesseePurchaseOptionReasonablyCertainOfExercising	38700000	USD
CY2021	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	2319362000	USD
CY2020	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	2211915000	USD
CY2019	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	2261260000	USD
CY2021	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	433652000	USD
CY2020	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	434346000	USD
CY2019	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	496754000	USD
CY2021	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2753014000	USD
CY2020	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2646261000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2758014000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Next Twelve Months LessorOperatingLeasePaymentsToBeReceivedNextTwelveMonths	2252034000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Two Years LessorOperatingLeasePaymentsToBeReceivedTwoYears	2251287000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Three Years LessorOperatingLeasePaymentsToBeReceivedThreeYears	2138772000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Four Years LessorOperatingLeasePaymentsToBeReceivedFourYears	2012975000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Five Years LessorOperatingLeasePaymentsToBeReceivedFiveYears	1877563000	USD
CY2021Q4	us-gaap	Lessor Operating Lease Payments To Be Received Thereafter LessorOperatingLeasePaymentsToBeReceivedThereafter	12215114000	USD
CY2020	bxp	Number Of Tenants Above Concentration Amount NumberOfTenantsAboveConcentrationAmount	0
CY2019	bxp	Number Of Tenants Above Concentration Amount NumberOfTenantsAboveConcentrationAmount	0
CY2021	bxp	Number Of Tenants Above Concentration Amount NumberOfTenantsAboveConcentrationAmount	0
CY2021	us-gaap	Concentration Risk Percentage1 ConcentrationRiskPercentage1	0.100
CY2020	us-gaap	Concentration Risk Percentage1 ConcentrationRiskPercentage1	0.100
CY2019	us-gaap	Concentration Risk Percentage1 ConcentrationRiskPercentage1	0.100
CY2020Q4	us-gaap	Deferred Offering Costs DeferredOfferingCosts	12728000	USD
CY2021Q4	bxp	Deferred Costs Gross DeferredCostsGross	1030460000	USD
CY2021Q4	bxp	Accumulated Amortization Leasing And Financing Costs AccumulatedAmortizationLeasingAndFinancingCosts	411662000	USD
CY2020Q4	bxp	Accumulated Amortization Leasing And Financing Costs AccumulatedAmortizationLeasingAndFinancingCosts	395701000	USD
CY2021Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	618798000	USD
CY2020Q4	us-gaap	Deferred Costs Current And Noncurrent DeferredCostsCurrentAndNoncurrent	640085000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Rolling Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextRollingTwelveMonths	13827000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	3911000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	2200000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	2112000	USD
CY2021Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	1624000	USD
CY2021Q4	bxp	Investments In Affiliates Subsidiaries Associates And Joint Venturesnet InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet	1445926000	USD
CY2020Q4	bxp	Investments In Affiliates Subsidiaries Associates And Joint Venturesnet InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet	1273919000	USD
CY2021	bxp	Schedule Of Statements Of Operations Of Unconsolidated Joint Ventures Text Bock ScheduleOfStatementsOfOperationsOfUnconsolidatedJointVenturesTextBock	<div style="margin-top:14pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows:</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%"> </span></div><div style="margin-top:5pt"><table style="border-collapse:collapse;display:inline-table;margin-bottom:5pt;vertical-align:text-bottom;width:100.000%"><tr><td style="width:1.0%"/><td style="width:57.671%"/><td style="width:0.1%"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td style="width:1.0%"/><td style="width:11.180%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:1.992%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.180%"/><td style="width:0.1%"/><td style="width:0.1%"/><td style="width:1.992%"/><td style="width:0.1%"/><td style="width:1.0%"/><td style="width:11.185%"/><td style="width:0.1%"/></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="15" style="padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:700;line-height:100%">Year ended December 31,</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:700;line-height:100%">2021</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:700;line-height:100%">2020</span></td><td colspan="3" style="border-top:1pt solid #000;padding:0 1pt"/><td colspan="3" style="border-bottom:1pt solid #000000;border-top:1pt solid #000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:700;line-height:100%">2019</span></td></tr><tr><td colspan="3" style="padding:2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:100%"> </span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="15" style="border-top:1pt solid #000000;padding:2px 1pt;text-align:center;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:700;line-height:100%">(in thousands)</span></td></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Total revenue (1)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">383,649 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">319,560 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#cceeff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">322,817 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Expenses</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Operating</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">158,498 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">144,347 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">122,992 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Transaction costs</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">470 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">1,027 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">1,000 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Depreciation and amortization</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">147,121 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">141,853 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">102,296 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Total expenses</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">306,089 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">287,227 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">226,288 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Other income (expense)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Interest expense</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(108,884)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(98,051)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(84,409)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt 2px 19pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Gains on sales of real estate (2)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">11,737 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">32,706 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt 2px 37pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Net income (loss)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(31,324)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(53,981)</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">44,826 </span></td><td style="background-color:#ffffff;border-top:1pt solid #000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr style="height:15pt"><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="background-color:#cceeff;border-top:3pt double #000000;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:3pt double #000000;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="3" style="background-color:#cceeff;border-top:3pt double #000000;padding:0 1pt"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Company’s share of net income (loss)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(10,254)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(16,256)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">24,423 </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Gain on sale of investment (3)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">10,257 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Impairment loss on investment (4)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(60,524)</span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td colspan="2" style="background-color:#ffffff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">— </span></td><td style="background-color:#ffffff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#cceeff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Basis differential (2)(4)(5)</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(2,573)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(8,330)</span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#cceeff;padding:0 1pt"/><td colspan="2" style="background-color:#cceeff;padding:2px 0 2px 1pt;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">22,169 </span></td><td style="background-color:#cceeff;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr><tr><td colspan="3" style="background-color:#ffffff;padding:2px 1pt;text-align:left;vertical-align:top"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">Income (loss) from unconsolidated joint ventures</span></td><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td colspan="3" style="display:none"/><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(2,570)</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">(85,110)</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/><td colspan="3" style="background-color:#ffffff;padding:0 1pt"/><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0 2px 1pt;text-align:left;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">$</span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 0;text-align:right;vertical-align:bottom"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:100%">46,592 </span></td><td style="background-color:#ffffff;border-bottom:3pt double #000000;border-top:1pt solid #000000;padding:2px 1pt 2px 0;text-align:right;vertical-align:bottom"/></tr></table></div><div><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">_______________ </span></div><div style="padding-left:27pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(1)</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">Includes straight-line rent adjustments of approximately $17.2 million, $(10.1) million and $32.4 million for the years ended December 31, 2021, 2020 and 2019, respectively.</span></div><div style="padding-left:27pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(2)</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">For the year ended December 31, 2020, represents the gain on sale of Annapolis Junction Building Eight and two land parcels. For the year ended December 31, 2019, represents the gain on sale of 540 Madison Avenue recognized by the joint venture. During 2008, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture resulting in a basis differential between the carrying value of the Company’s investment in the joint venture and the joint venture’s basis in the assets and liabilities of the property. As a result of the historical basis difference, the Company recognized a gain on sale of real estate totaling approximately $47.2 million for the year ended December 31, 2019, which consists of its share of the gain on sale reported by the joint venture as well as an adjustment for the basis differential. The gain on sale of real estate is included in Income (loss) from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.</span></div><div style="padding-left:27pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(3)</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">During the year ended December 31, 2021, the Company completed the sale of its 50% ownership interest in Annapolis Junction NFM LLC. The Company recognized a gain on sale of investment of approximately $10.3 million.</span></div><div style="padding-left:27pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(4)</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">During the year ended December 31, 2020, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture that owns Dock 72 in Brooklyn, New York totaling approximately $60.5 million.</span></div><div style="padding-left:27pt;text-indent:-18pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%">(5)</span><span style="color:#000000;font-family:'Arial',sans-serif;font-size:9pt;font-weight:400;line-height:120%;padding-left:7.02pt">Includes straight-line rent adjustments of approximately $0.8 million, $1.8 million and $2.1 million for the years ended December 31, 2021, 2020 and 2019, respectively. Also includes net above-/below-market rent adjustments of approximately $0.4 million, $0.9 million and $1.7 million for the years ended December 31, 2021, 2020 and 2019, respectively.</span></div>
CY2021Q4	us-gaap	Secured Debt SecuredDebt	3300000000	USD
CY2020Q4	us-gaap	Secured Debt SecuredDebt	2900000000	USD
CY2020	us-gaap	Debt Instrument Collateral DebtInstrumentCollateral	each collateralized by one or more buildings and related land included in real estate assets
CY2021	us-gaap	Debt Instrument Collateral DebtInstrumentCollateral	each collateralized by one or more buildings and related land included in real estate assets
CY2020Q4	bxp	Number Of Variable Mortgage Loans NumberOfVariableMortgageLoans	0
CY2021Q4	bxp	Number Of Variable Mortgage Loans NumberOfVariableMortgageLoans	0
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2021Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	3300000000	USD
CY2021Q4	us-gaap	Long Term Debt LongTermDebt	3300000000	USD
CY2021Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	-32086000	USD
CY2021Q4	us-gaap	Secured Debt SecuredDebt	3267914000	USD
CY2021Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	1500000000	USD
CY2021Q2	us-gaap	Line Of Credit Facility Expiration Date1 LineOfCreditFacilityExpirationDate1	2026-06-15
CY2021Q2	bxp	Line Of Credit Additional Borrowing Capacity LineOfCreditAdditionalBorrowingCapacity	500000000	USD
CY2021Q2	us-gaap	Line Of Credit Facility Interest Rate Description LineOfCreditFacilityInterestRateDescription	At Boston Properties Limited Partnership’s option, loans under the 2021 Credit Facility will bear interest at a rate per annum equal to (1) (a) in the case of loans denominated in Dollars, LIBOR, (b) in the case of loans denominated in Euro, EURIBOR, (c) in the case of loans denominated in Canadian Dollars, CDOR, and (d) in the case of loans denominated in Sterling, SONIA, in each case, plus a margin ranging from 70.0 to 140.0 basis points based on Boston Properties Limited Partnership’s credit rating or (2) an alternate base rate equal to the greatest of (a) the Federal Funds rate plus 0.5%, (b) the Administrative Agent’s prime rate, (c) LIBOR for a one-month period plus 1.00%, and (d) 1.00%, in each case, plus a margin ranging from 0 to 40 basis points based on Boston Properties Limited Partnership’s credit rating.
CY2021Q2	bxp	Line Of Credit Facility Maximum Percent For Loan Advances LineOfCreditFacilityMaximumPercentForLoanAdvances	0.65
CY2021Q4	us-gaap	Debt Instrument Basis Spread On Variable Rate1 DebtInstrumentBasisSpreadOnVariableRate1	0.00775
CY2021Q4	bxp	Debt Instrument Alternate Basis Spread On Variable Rate DebtInstrumentAlternateBasisSpreadOnVariableRate	0
CY2021Q4	us-gaap	Line Of Credit Facility Commitment Fee Percentage LineOfCreditFacilityCommitmentFeePercentage	0.0015
CY2021Q2	us-gaap	Line Of Credit Facility Covenant Terms LineOfCreditFacilityCovenantTerms	Among other covenants, the 2021 Credit Facility requires that Boston Properties Limited Partnership maintain on an ongoing basis: (1) a leverage ratio not to exceed 60%, however, the leverage ratio may increase to no greater than 65% provided that it is reduced back to 60% within one year, (2) a secured debt leverage ratio not to exceed 55%, (3) a fixed charge coverage ratio of at least 1.40, (4) an unsecured debt leverage ratio not to exceed 60%, however, the unsecured debt leverage ratio may increase to no greater than 65% provided that it is reduced to 60% within one year, (5) an unsecured debt interest coverage ratio of at least 1.75 and (6) limitations on permitted investments.
CY2021	us-gaap	Line Of Credit Facility Covenant Compliance LineOfCreditFacilityCovenantCompliance	At December 31, 2021, Boston Properties Limited Partnership was in compliance with each of these financial and other covenant requirements.
CY2021Q4	bxp	Letter Of Credit And Performance Obligation LetterOfCreditAndPerformanceObligation	26400000	USD
CY2021Q4	bxp	Insurance Policy Limit InsurancePolicyLimit	1000000000	USD
CY2021Q4	bxp	Insurance Policy Limit InsurancePolicyLimit	1000000000	USD
CY2021	bxp	Per Occurrence Limit For Nbcr Coverage PerOccurrenceLimitForNbcrCoverage	1000000000	USD
CY2021Q4	bxp	Program Trigger Value ProgramTriggerValue	200000000	USD
CY2021	bxp	Program Trigger Coinsurance ProgramTriggerCoinsurance	0.20
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CY2021Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	3267914000	USD
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CY2021Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	24108220000	USD
CY2021Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	5848183000	USD
CY2021Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	51695000	USD
CY2021Q4	srt	Real Estate Federal Income Tax Basis RealEstateFederalIncomeTaxBasis	21800000000	USD
CY2021Q4	bxp	Real Estate Aggregate Accumulated Depreciation For Tax Purposes RealEstateAggregateAccumulatedDepreciationForTaxPurposes	4900000000	USD
CY2021Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	-32100000	USD
CY2020Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	23303303000	USD
CY2019Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	22844697000	USD
CY2018Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	21605545000	USD
CY2021	bxp	Real Estate Improvements Excluding Furniture Fixtures And Equipment RealEstateImprovementsExcludingFurnitureFixturesAndEquipment	1145084000	USD
CY2020	bxp	Real Estate Improvements Excluding Furniture Fixtures And Equipment RealEstateImprovementsExcludingFurnitureFixturesAndEquipment	996989000	USD
CY2019	bxp	Real Estate Improvements Excluding Furniture Fixtures And Equipment RealEstateImprovementsExcludingFurnitureFixturesAndEquipment	1671898000	USD
CY2021	bxp	Real Estate Cost Of Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateCostOfRealEstateSoldExcludingFurnitureFixturesAndEquipment	-340167000	USD
CY2020	bxp	Real Estate Cost Of Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateCostOfRealEstateSoldExcludingFurnitureFixturesAndEquipment	-538383000	USD
CY2019	bxp	Real Estate Cost Of Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateCostOfRealEstateSoldExcludingFurnitureFixturesAndEquipment	-432746000	USD
CY2021Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	24108220000	USD
CY2020Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	23303303000	USD
CY2019Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	22844697000	USD
CY2020Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	5501637000	USD
CY2019Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	5239179000	USD
CY2018Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	4871102000	USD
CY2021	bxp	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures And Equipment SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpenseExcludingFurnitureFixturesAndEquipment	623854000	USD
CY2020	bxp	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures And Equipment SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpenseExcludingFurnitureFixturesAndEquipment	573898000	USD
CY2019	bxp	Sec Schedule Iii Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures And Equipment SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpenseExcludingFurnitureFixturesAndEquipment	564938000	USD
CY2021	bxp	Real Estate Accumulated Depreciation Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationRealEstateSoldExcludingFurnitureFixturesAndEquipment	-277308000	USD
CY2020	bxp	Real Estate Accumulated Depreciation Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationRealEstateSoldExcludingFurnitureFixturesAndEquipment	-311440000	USD
CY2019	bxp	Real Estate Accumulated Depreciation Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationRealEstateSoldExcludingFurnitureFixturesAndEquipment	-196861000	USD
CY2021Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	5848183000	USD
CY2020Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	5501637000	USD
CY2019Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	5239179000	USD

Files In Submission

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$BXP
BXP Inc Stock $bxp

2021 Form 10-K Financial Statement

#000165642322000013 Filed on February 25, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXP BXP Inc Stock $bxp

2021 Form 10-K Financial Statement

#000165642322000013 Filed on February 25, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXP
BXP Inc Stock $bxp