$BXP
BXP, Inc. Stock $bxp

$bxp Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000165642320000007 Filed on March 02, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$757.5M	$705.2M	$686.3M
YoY Change	7.42%	7.62%	4.34%
Cost Of Revenue	$279.4M	$263.5M	$259.3M
YoY Change	6.03%	8.88%	5.49%
Gross Profit	$478.1M	$441.7M	$411.7M
YoY Change	8.24%	6.9%	-0.05%
Gross Profit Margin	63.12%	62.64%	59.99%
Selling, General & Admin	$32.80M	$27.70M	$29.70M
YoY Change	18.41%	-5.78%	15.12%
% of Gross Profit	6.86%	6.27%	7.21%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$169.9M	$165.4M	$158.0M
YoY Change	2.72%	7.26%	3.81%
% of Gross Profit	35.54%	37.45%	38.38%
Operating Expenses	$202.7M	$193.1M	$187.7M
YoY Change	4.97%	5.17%	5.45%
Operating Profit	$275.4M	$248.6M	$238.4M
YoY Change	10.78%	8.28%	1.98%
Interest Expense	-$97.20M	-$94.60M	$95.37M
YoY Change	2.75%	12.22%	3.62%
% of Operating Profit	-35.29%	-38.05%	40.01%
Other Income/Expense, Net
YoY Change
Pretax Income	$176.0M	$185.2M	$150.4M
YoY Change	-4.97%	40.09%	1.83%
Income Tax
% Of Pretax Income
Net Earnings	$140.8M	$148.5M	$119.1M
YoY Change	-5.19%	43.05%	1.52%
Net Earnings / Revenue	18.59%	21.06%	17.36%
Basic Earnings Per Share	$0.91	$0.96	$0.77
Diluted Earnings Per Share	$0.91	$0.96	$0.77
COMMON SHARES
Basic Shares Outstanding	154.6M shares	154.4M shares	154.4M shares
Diluted Shares Outstanding			154.7M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$681.7M	$571.6M	$353.9M
YoY Change	19.27%	23.2%	-23.53%
Cash & Equivalents	$645.0M	$543.4M	$322.5M
Short-Term Investments	$36.75M	$28.20M	$31.38M
Other Short-Term Assets	$42.00M	$81.00M	$133.0M
YoY Change	-48.15%	3.85%	-8.28%
Inventory
Prepaid Expenses
Receivables	$113.0M	$87.00M	$99.00M
Other Receivables	$1.039B	$935.0M	$926.0M
Total Short-Term Assets	$1.839B	$1.646B	$1.481B
YoY Change	11.73%	12.2%	-4.64%
LONG-TERM ASSETS
Property, Plant & Equipment	$17.62B	$16.75B	$16.85B
YoY Change	5.19%	1.48%	2.9%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$992.0M	$985.0M	$957.0M
YoY Change	0.71%	51.77%	49.53%
Other Assets	$736.0M	$775.0M	$771.0M
YoY Change	-5.03%	3.33%	4.05%
Total Long-Term Assets	$19.45B	$18.61B	$18.66B
YoY Change	4.49%	3.94%	5.07%
TOTAL ASSETS
Total Short-Term Assets	$1.839B	$1.646B	$1.481B
Total Long-Term Assets	$19.45B	$18.61B	$18.66B
Total Assets	$21.28B	$20.26B	$20.14B
YoY Change	5.08%	4.56%	4.29%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$378.0M	$277.0M	$315.0M
YoY Change	36.46%	-16.57%	-3.08%
Accrued Expenses	$290.0M	$89.00M	$93.00M
YoY Change	225.84%	5.95%	-6.06%
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	$839.0M	$531.0M	$573.0M
YoY Change	58.0%	-4.32%	3.43%
LONG-TERM LIABILITIES
Long-Term Debt	$12.04B	$11.01B	$10.89B
YoY Change	9.34%	7.17%	6.4%
Other Long-Term Liabilities	$396.0M	$504.0M	$468.0M
YoY Change	-21.43%	13.51%	11.69%
Total Long-Term Liabilities	$12.43B	$11.51B	$11.36B
YoY Change	7.99%	7.43%	6.61%
TOTAL LIABILITIES
Total Short-Term Liabilities	$839.0M	$531.0M	$573.0M
Total Long-Term Liabilities	$12.43B	$11.51B	$11.36B
Total Liabilities	$13.26B	$12.04B	$11.93B
YoY Change	10.13%	6.86%	6.45%
SHAREHOLDERS EQUITY
Retained Earnings	-$760.5M	-$675.5M	-$677.3M
YoY Change	12.58%	-5.17%	-2.23%
Common Stock	$1.548M	$1.545M	$1.544M
YoY Change	0.19%	0.13%	0.06%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$2.722M	$2.722M	$2.722M
YoY Change	0.0%	0.0%	0.0%
Treasury Stock Shares	78.90K shares	78.90K shares	78.90K shares
Shareholders Equity	$5.685B	$5.883B	$5.877B
YoY Change
Total Liabilities & Shareholders Equity	$21.28B	$20.26B	$20.14B
YoY Change	5.08%	4.56%	4.29%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$140.8M	$148.5M	$119.1M
YoY Change	-5.19%	43.05%	1.52%
Depreciation, Depletion And Amortization	$169.9M	$165.4M	$158.0M
YoY Change	2.72%	7.26%	3.81%
Cash From Operating Activities	$361.4M	$379.6M	$209.8M
YoY Change	-4.79%	18.89%	-7.94%
INVESTING ACTIVITIES
Capital Expenditures	-$267.4M	-$293.8M	-$239.5M
YoY Change	-8.99%	9.3%	-8.38%
Acquisitions
YoY Change
Other Investing Activities	-$11.20M	$215.0M	-$294.8M
YoY Change	-105.21%	2262.64%	-257.98%
Cash From Investing Activities	-$278.6M	-$78.80M	-$534.3M
YoY Change	253.55%	-69.65%	615.26%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-195.6M	-85.40M	21.30M
YoY Change	129.04%	-22.78%	-115.58%
NET CHANGE
Cash From Operating Activities	361.4M	379.6M	209.8M
Cash From Investing Activities	-278.6M	-78.80M	-534.3M
Cash From Financing Activities	-195.6M	-85.40M	21.30M
Net Change In Cash	-112.8M	215.4M	-303.2M
YoY Change	-152.37%	-523.18%	-1937.58%
FREE CASH FLOW
Cash From Operating Activities	$361.4M	$379.6M	$209.8M
Capital Expenditures	-$267.4M	-$293.8M	-$239.5M
Free Cash Flow	$628.8M	$673.4M	$449.3M
YoY Change	-6.62%	14.5%	-8.17%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018Q4	bxp	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2019Q4	bxp	Excess Stock Par Or Stated Value Per Share ExcessStockParOrStatedValuePerShare	0.01
CY2017Q4	bxp	Non Qualified Stock Options Issued NonQualifiedStockOptionsIssued	0	shares
CY2018Q4	bxp	Non Qualified Stock Options Issued NonQualifiedStockOptionsIssued	0	shares
CY2018Q4	bxp	Number Of Mortgage Loans Accounted For Fair Value NumberOfMortgageLoansAccountedForFairValue	0
CY2017	bxp	Number Of Tenants Above Concentration Amount NumberOfTenantsAboveConcentrationAmount	0	tenants
CY2018	bxp	Number Of Tenants Above Concentration Amount NumberOfTenantsAboveConcentrationAmount	0	tenants
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0001037540
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	250000000	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	250000000	shares
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	154537378	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	154869198	shares
CY2018Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	154458478	shares
CY2017	us-gaap	Concentration Risk Percentage1 ConcentrationRiskPercentage1	0.100
CY2018	us-gaap	Concentration Risk Percentage1 ConcentrationRiskPercentage1	0.100
CY2018Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	150000000	shares
CY2019Q4	us-gaap	Excess Stock Shares Authorized ExcessStockSharesAuthorized	150000000	shares
CY2018Q4	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	0	shares
CY2019Q4	us-gaap	Excess Stock Shares Issued ExcessStockSharesIssued	0	shares
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CY2019Q4	us-gaap	Excess Stock Shares Outstanding ExcessStockSharesOutstanding	0	shares
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
CY2019Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	50000000	shares
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CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity File Number EntityFileNumber	1-13087
CY2019	dei	Entity Registrant Name EntityRegistrantName	BOSTON PROPERTIES, INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	04-2473675
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	Prudential Center, 800 Boylston Street, Suite 1900
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Boston
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	MA
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	02199-8103
CY2019	dei	City Area Code CityAreaCode	617
CY2019	dei	Local Phone Number LocalPhoneNumber	236-3300
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
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CY2019	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	24038000	USD
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CY2017	us-gaap	Interest Expense InterestExpense	374481000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-29540000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16490000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	496000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	651999000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	712563000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	562481000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Limited Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable	71120000	USD
CY2018	us-gaap	Noncontrolling Interest In Net Income Loss Limited Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable	62909000	USD
CY2017	us-gaap	Noncontrolling Interest In Net Income Loss Limited Partnerships Nonredeemable NoncontrollingInterestInNetIncomeLossLimitedPartnershipsNonredeemable	47832000	USD
CY2019	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	59345000	USD
CY2018	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	66807000	USD
CY2017	us-gaap	Noncontrolling Interest In Net Income Loss Operating Partnerships Redeemable NoncontrollingInterestInNetIncomeLossOperatingPartnershipsRedeemable	52210000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	521534000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	582847000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	462439000	USD
CY2019	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	10500000	USD
CY2018	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	10500000	USD
CY2017	us-gaap	Preferred Stock Dividends Income Statement Impact PreferredStockDividendsIncomeStatementImpact	10500000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	511034000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	572347000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	451939000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.31
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.71
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.93
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	154582000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	154427000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	154190000	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.30
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.70
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.93
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	154883000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	154682000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	154390000	shares
CY2019	us-gaap	Profit Loss ProfitLoss	651999000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-3096000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	712563000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	562481000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6133000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6664000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-6751000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6664000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-6033000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-87000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3568000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-100000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	651912000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	716131000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	562381000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	130465000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	129716000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	100042000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	507000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	880000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-1922000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	520940000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	585535000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	464261000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	7931924000	USD
CY2017	us-gaap	Cumulative Effect On Retained Earnings Net Of Tax1 CumulativeEffectOnRetainedEarningsNetOfTax1	-2035000	USD
CY2017	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2017	bxp	Equity Profit Loss EquityProfitLoss	-562481000	USD
CY2017	us-gaap	Dividends Dividends	535310000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	795000	USD
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	37292000	USD
CY2017	bxp	Proceedsfromnoncontrollinginterestincludingacontributionrelatedtotherepaymentofamembersnotepayable Proceedsfromnoncontrollinginterestincludingacontributionrelatedtotherepaymentofamembersnotepayable	161585000	USD
CY2017	us-gaap	Noncontrolling Interest In Net Income Loss Joint Venture Partners Nonredeemable NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable	54176000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-6133000	USD
CY2017	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	6033000	USD
CY2017	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8102456000	USD
CY2018	us-gaap	Cumulative Effect On Retained Earnings Net Of Tax1 CumulativeEffectOnRetainedEarningsNetOfTax1	5496000	USD
CY2018	us-gaap	Stock Issued During Period Value Conversion Of Units StockIssuedDuringPeriodValueConversionOfUnits	0	USD
CY2018	bxp	Equity Profit Loss EquityProfitLoss	-712563000	USD
CY2018	us-gaap	Dividends Dividends	613702000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	797000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	38590000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	46701000	USD
CY2018	us-gaap	Noncontrolling Interest In Net Income Loss Joint Venture Partners Nonredeemable NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable	82501000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-3096000	USD
CY2018	us-gaap	Other Comprehensive Income Other Net Of Tax OtherComprehensiveIncomeOtherNetOfTax	6664000	USD
CY2018	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	0	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8213968000	USD
CY2019	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	688000	USD
CY2019	us-gaap	Cumulative Effect On Retained Earnings Net Of Tax1 CumulativeEffectOnRetainedEarningsNetOfTax1	-4379000	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 Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	45000000	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	bxp	Saleofaninterestinpropertypartnerships Saleofaninterestinpropertypartnerships	0	USD
CY2019	bxp	Difference Between Purchase Price And Carrying Value DifferenceBetweenPurchasePriceAndCarryingValue	-186963000	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
CY2019	us-gaap	Profit Loss ProfitLoss	651999000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	712563000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	562481000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	677764000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	645649000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	617547000	USD
CY2019	bxp	Amortizationofrightofuseassetoperatingleases Amortizationofrightofuseassetoperatingleases	2412000	USD
CY2019	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	24038000	USD
CY2018	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	11812000	USD
CY2017	us-gaap	Impairment Of Real Estate ImpairmentOfRealEstate	0	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	40958000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	40117000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	35361000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	46592000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2222000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	11232000	USD
CY2019	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	17155000	USD
CY2018	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	6703000	USD
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	26858000	USD
CY2019	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	6417000	USD
CY2018	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	-1865000	USD
CY2017	us-gaap	Gain Loss On Sale Of Investments GainLossOnSaleOfInvestments	3678000	USD
CY2019	us-gaap	Paid In Kind Interest PaidInKindInterest	22254000	USD
CY2018	us-gaap	Paid In Kind Interest PaidInKindInterest	21303000	USD
CY2017	us-gaap	Paid In Kind Interest PaidInKindInterest	-1284000	USD
CY2019	us-gaap	Accretion Expense AccretionExpense	-763000	USD
CY2018	us-gaap	Accretion Expense AccretionExpense	-483000	USD
CY2017	us-gaap	Accretion Expense AccretionExpense	-1980000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-29540000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-16490000	USD
CY2017	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	496000	USD
CY2019	us-gaap	Gain Loss On Sale Of Properties Before Applicable Income Taxes GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes	709000	USD
CY2018	us-gaap	Gain Loss On Sale Of Properties Before Applicable Income Taxes GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes	182356000	USD
CY2017	us-gaap	Gain Loss On Sale Of Properties Before Applicable Income Taxes GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes	7663000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	24876000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-29204000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-2433000	USD
CY2019	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	-4000	USD
CY2018	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	13000	USD
CY2017	us-gaap	Increase Decrease In Finance Receivables IncreaseDecreaseInFinanceReceivables	0	USD
CY2019	us-gaap	Straight Line Rent StraightLineRent	56817000	USD
CY2018	us-gaap	Straight Line Rent StraightLineRent	43662000	USD
CY2017	us-gaap	Straight Line Rent StraightLineRent	58355000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-2965000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-12472000	USD
CY2017	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-51425000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	-1616000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	12627000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	1353000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	10482000	USD
CY2019	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	858000	USD
CY2018	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	5237000	USD
CY2017	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-160521000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-49569000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4955000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-44970000	USD
CY2019	us-gaap	Lease Cost LeaseCost	-117282000	USD
CY2018	us-gaap	Lease Cost LeaseCost	-130742000	USD
CY2017	us-gaap	Lease Cost LeaseCost	-104429000	USD
CY2019	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	529166000	USD
CY2018	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	437682000	USD
CY2017	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	349498000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1181165000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1150245000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	911979000	USD
CY2019	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	149031000	USD
CY2018	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	0	USD
CY2017	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	15953000	USD
CY2019	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	546060000	USD
CY2018	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	694791000	USD
CY2017	us-gaap	Payments To Acquire Other Productive Assets PaymentsToAcquireOtherProductiveAssets	608404000	USD
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	180556000	USD
CY2018	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	189771000	USD
CY2017	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	222482000	USD
CY2019	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	251831000	USD
CY2018	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	210034000	USD
CY2017	us-gaap	Payments For Tenant Improvements PaymentsForTenantImprovements	205331000	USD
CY2019	bxp	Rightofuseassetsfinanceleases Rightofuseassetsfinanceleases	5152000	USD
CY2018	bxp	Rightofuseassetsfinanceleases Rightofuseassetsfinanceleases	0	USD
CY2019	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	90824000	USD
CY2018	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	455409000	USD
CY2017	bxp	Rightofuseassetsfinanceleases Rightofuseassetsfinanceleases	0	USD
CY2017	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	29810000	USD
CY2019	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	87392000	USD
CY2018	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	345717000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	109015000	USD
CY2019	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	136807000	USD
CY2018	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	251000000	USD
CY2019	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	24112000	USD
CY2018	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	0	USD
CY2017	us-gaap	Payments For Proceeds From Other Real Estate Partnerships PaymentsForProceedsFromOtherRealEstatePartnerships	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	13615000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	0	USD
CY2018	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	80000000	USD
CY2017	us-gaap	Origination Of Notes Receivable From Related Parties OriginationOfNotesReceivableFromRelatedParties	0	USD
CY2019	us-gaap	Payments For Proceeds From Mortgage Deposits PaymentsForProceedsFromMortgageDeposits	0	USD
CY2018	us-gaap	Payments For Proceeds From Mortgage Deposits PaymentsForProceedsFromMortgageDeposits	19455000	USD
CY2017	us-gaap	Payments For Proceeds From Mortgage Deposits PaymentsForProceedsFromMortgageDeposits	0	USD
CY2019	us-gaap	Proceeds From Mortgage Deposits ProceedsFromMortgageDeposits	3544000	USD
CY2018	us-gaap	Proceeds From Mortgage Deposits ProceedsFromMortgageDeposits	0	USD
CY2017	us-gaap	Proceeds From Mortgage Deposits ProceedsFromMortgageDeposits	0	USD
CY2019	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	2132000	USD
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	902000	USD
CY2017	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	1669000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1015091000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1098876000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-882044000	USD
CY2019	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	2300000000	USD
CY2019	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	46173000	USD
CY2018	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	18634000	USD
CY2017	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	1317653000	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	1548106000	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	996410000	USD
CY2017	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	847935000	USD
CY2019	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	699237000	USD
CY2018	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	699517000	USD
CY2017	us-gaap	Repayments Of Unsecured Debt RepaymentsOfUnsecuredDebt	848020000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	380000000	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	790000000	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	745000000	USD
CY2017	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	580000000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	380000000	USD
CY2017	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	535000000	USD
CY2019	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	0	USD
CY2018	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	500000000	USD
CY2017	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	0	USD
CY2019	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2018	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	0	USD
CY2017	us-gaap	Repayments Of Subordinated Debt RepaymentsOfSubordinatedDebt	306000000	USD
CY2019	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
CY2018	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
CY2017	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	70424000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	502000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2017	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2019	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	0	USD
CY2018	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	1353000	USD
CY2017	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	493000	USD
CY2019	bxp	Paymentsonrealestatetransaction Paymentsonrealestatetransaction	0	USD
CY2018	bxp	Paymentsonrealestatetransaction Paymentsonrealestatetransaction	960000	USD
CY2017	bxp	Paymentsonrealestatetransaction Paymentsonrealestatetransaction	2840000	USD
CY2019	us-gaap	Payments For Proceeds From Deposit On Loan PaymentsForProceedsFromDepositOnLoan	0	USD
CY2018	us-gaap	Payments For Proceeds From Deposit On Loan PaymentsForProceedsFromDepositOnLoan	0	USD
CY2017	us-gaap	Payments For Proceeds From Deposit On Loan PaymentsForProceedsFromDepositOnLoan	23200000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	0	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	23200000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	13213000	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	8362000	USD
CY2017	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	50705000	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	28716000	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	15973000	USD
CY2017	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	12784000	USD
CY2019	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	13710000	USD
CY2018	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	-730000	USD
CY2017	us-gaap	Proceeds From Issuance Or Sale Of Equity ProceedsFromIssuanceOrSaleOfEquity	241000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	666294000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	587628000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	526578000	USD
CY2019	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	35816000	USD
CY2018	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	46701000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	52009000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	69913000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	82501000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	54342000	USD
CY2018	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	0	USD
CY2017	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	0	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-113379000	USD
CY2019	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	-186963000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	82453000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	55346000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	52695000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	133822000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	85281000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	639191000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	505369000	USD
CY2016Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	420088000	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
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	505369000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	543359000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	434767000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	356914000	USD
CY2018Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	95832000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	70602000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	63174000	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
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	434767000	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
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	70602000	USD
CY2019	us-gaap	Interest Paid InterestPaid	439059000	USD
CY2018	us-gaap	Interest Paid InterestPaid	416019000	USD
CY2017	us-gaap	Interest Paid InterestPaid	598486000	USD
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	54911000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	65766000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	61070000	USD
CY2019	bxp	Writeoffoffullydepreciatedrealestate Writeoffoffullydepreciatedrealestate	129831000	USD
CY2018	bxp	Writeoffoffullydepreciatedrealestate Writeoffoffullydepreciatedrealestate	135431000	USD
CY2017	bxp	Writeoffoffullydepreciatedrealestate Writeoffoffullydepreciatedrealestate	124891000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	89245000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	-44866000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	27978000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	0	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	12397000	USD
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	28962000	USD
CY2019	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	287540000	USD
CY2018	bxp	Prepaidrentreclassifiedtorightofuseasset Prepaidrentreclassifiedtorightofuseasset	0	USD
CY2017	bxp	Prepaidrentreclassifiedtorightofuseasset Prepaidrentreclassifiedtorightofuseasset	0	USD
CY2018	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	0	USD
CY2017	us-gaap	Capital Lease Obligations Incurred CapitalLeaseObligationsIncurred	0	USD
CY2019	bxp	Prepaidrentreclassifiedtorightofuseasset Prepaidrentreclassifiedtorightofuseasset	15000000	USD
CY2019	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	12767000	USD
CY2018	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2017	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2019	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	135004000	USD
CY2018	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2017	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	0	USD
CY2019	us-gaap	Transfer To Investments TransferToInvestments	29246000	USD
CY2018	us-gaap	Transfer To Investments TransferToInvestments	0	USD
CY2017	us-gaap	Transfer To Investments TransferToInvestments	0	USD
CY2019	bxp	Leaseliabilityfinanceleasedeconsolidation Leaseliabilityfinanceleasedeconsolidation	-119534000	USD
CY2018	bxp	Leaseliabilityfinanceleasedeconsolidation Leaseliabilityfinanceleasedeconsolidation	0	USD
CY2017	bxp	Leaseliabilityfinanceleasedeconsolidation Leaseliabilityfinanceleasedeconsolidation	0	USD
CY2019	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2018	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	0	USD
CY2017	us-gaap	Debt Conversion Original Debt Amount1 DebtConversionOriginalDebtAmount1	109576000	USD
CY2019Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	170713000	USD
CY2018Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	165114000	USD
CY2017Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	139040000	USD
CY2019	bxp	Conversions Of Noncontrolling Interests To Stockholders Equity ConversionsOfNoncontrollingInterestsToStockholdersEquity	4885000	USD
CY2018	bxp	Conversions Of Noncontrolling Interests To Stockholders Equity ConversionsOfNoncontrollingInterestsToStockholdersEquity	2880000	USD
CY2017	bxp	Conversions Of Noncontrolling Interests To Stockholders Equity ConversionsOfNoncontrollingInterestsToStockholdersEquity	16916000	USD
CY2019	bxp	Issuance Of Restricted Securities To Employees And Directors IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors	37622000	USD
CY2018	bxp	Issuance Of Restricted Securities To Employees And Directors IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors	37052000	USD
CY2017	bxp	Issuance Of Restricted Securities To Employees And Directors IssuanceOfRestrictedSecuritiesToEmployeesAndDirectors	35989000	USD
CY2017	us-gaap	Proceeds From Payments To Minority Shareholders ProceedsFromPaymentsToMinorityShareholders	0	USD
CY2019	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.896
CY2018	us-gaap	Limited Liability Company Llc Or Limited Partnership Lp Managing Member Or General Partner Ownership Interest LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest	0.897
CY2019Q4	bxp	Restriction On Redemption Of Op Units From Date Of Issuance In Years RestrictionOnRedemptionOfOpUnitsFromDateOfIssuanceInYears	1	Y
CY2019Q4	bxp	Op Unit Conversion Rate OpUnitConversionRate	1	shares
CY2019Q4	bxp	Common Stock Conversion Rate CommonStockConversionRate	1	shares
CY2019Q4	bxp	Op Unit Conversion Rate OpUnitConversionRate	1	shares
CY2019Q4	bxp	Number Of Series Of Preferred Units Outstanding NumberOfSeriesOfPreferredUnitsOutstanding	1
CY2019Q4	bxp	Numberof Vi Es NumberofVIEs	6
CY2019Q4	bxp	Numberof Vi Es Total NumberofVIEsTotal	8
CY2019Q4	bxp	Numberof Vi Es NumberofVIEs	6
CY2019	bxp	Probable Sale Term Of Property After Classified As Held For Sale Years ProbableSaleTermOfPropertyAfterClassifiedAsHeldForSaleYears	1	Y
CY2019	bxp	Probable Sale Term Of Property After Classified As Held For Sale Years ProbableSaleTermOfPropertyAfterClassifiedAsHeldForSaleYears	1	Y
CY2019	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	54900000	USD
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	65800000	USD
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	61100000	USD
CY2019	bxp	Salaries And Related Costs Capitalized SalariesAndRelatedCostsCapitalized	10400000	USD
CY2018	bxp	Salaries And Related Costs Capitalized SalariesAndRelatedCostsCapitalized	12500000	USD
CY2017	bxp	Salaries And Related Costs Capitalized SalariesAndRelatedCostsCapitalized	13200000	USD
CY2019Q4	bxp	Cash Fdic Insured Limit CashFdicInsuredLimit	250000	USD
CY2019Q4	bxp	Separate Unrestricted Cash For Deferred Compensation Plan SeparateUnrestrictedCashForDeferredCompensationPlan	36700000	USD
CY2018Q4	bxp	Separate Unrestricted Cash For Deferred Compensation Plan SeparateUnrestrictedCashForDeferredCompensationPlan	28200000	USD
CY2019	us-gaap	Gain Loss On Investments GainLossOnInvestments	6400000	USD
CY2018	us-gaap	Gain Loss On Investments GainLossOnInvestments	-1900000	USD
CY2017	us-gaap	Gain Loss On Investments GainLossOnInvestments	3700000	USD
CY2018	bxp	Internal Leasing Salaries And Related Costs Capitalized InternalLeasingSalariesAndRelatedCostsCapitalized	5400000	USD
CY2017	bxp	Internal Leasing Salaries And Related Costs Capitalized InternalLeasingSalariesAndRelatedCostsCapitalized	5000000.0	USD
CY2019	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	-58400000	USD
CY2018	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	-51900000	USD
CY2017	us-gaap	Straight Line Rent Adjustments StraightLineRentAdjustments	-54800000	USD
CY2019	bxp	Above And Below Market Rent Adjustments AboveAndBelowMarketRentAdjustments	20900000	USD
CY2018	bxp	Above And Below Market Rent Adjustments AboveAndBelowMarketRentAdjustments	23800000	USD
CY2017	bxp	Above And Below Market Rent Adjustments AboveAndBelowMarketRentAdjustments	23500000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;padding-top:18px;text-indent:16px;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;font-style:italic;">Use of Estimates in the Preparation of Financial Statements</span></div><div style="line-height:120%;padding-top:6px;text-indent:32px;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">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>
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	151800000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	199300000	USD
CY2019Q4	us-gaap	Lessee Finance Lease Description LesseeFinanceLeaseDescription	four
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	14573000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	29000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	47000	USD
CY2019Q4	bxp	Financeleasesunderdevelopment Financeleasesunderdevelopment	3
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P51Y
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P71Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.057
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.062
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	11425000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	18425000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	25310000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	8894000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	9084000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	567232000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	1441000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	12682000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	2123000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	1253000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	944000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	73241000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Net Minimum Payments1 CapitalLeasesFutureMinimumPaymentsNetMinimumPayments1	91684000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	27497000	USD
CY2018Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	64187000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	10050000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Remainder Of Fiscal Year FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear	834000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	24973000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	5960000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	18041000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	10208000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	10322000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	9708000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	9277000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	48518000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	557954000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	1383242000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	630617000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	1458470000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	-430437000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	-1234428000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	200180000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	224042000	USD
CY2019Q4	bxp	Lessee Finance Lease Optionto Extend Reasonably Certain2024 LesseeFinanceLeaseOptiontoExtendReasonablyCertain2024	38700000	USD
CY2019	us-gaap	Operating Lease Lease Income Lease Payments OperatingLeaseLeaseIncomeLeasePayments	2261260000	USD
CY2019	us-gaap	Operating Lease Variable Lease Income OperatingLeaseVariableLeaseIncome	496754000	USD
CY2019	us-gaap	Operating Lease Lease Income OperatingLeaseLeaseIncome	2758014000	USD
CY2019	bxp	Dividends Treatment For Federal Tax Purposes DividendsTreatmentForFederalTaxPurposes	3.15
CY2019	bxp	Dividends Treatment For Federal Tax Purposes Percentage DividendsTreatmentForFederalTaxPurposesPercentage	1.0000
CY2018	bxp	Dividends Treatment For Federal Tax Purposes DividendsTreatmentForFederalTaxPurposes	3.57
CY2018	bxp	Dividends Treatment For Federal Tax Purposes Percentage DividendsTreatmentForFederalTaxPurposesPercentage	1.0000
CY2017	bxp	Dividends Treatment For Federal Tax Purposes DividendsTreatmentForFederalTaxPurposes	2.91
CY2017	bxp	Dividends Treatment For Federal Tax Purposes Percentage DividendsTreatmentForFederalTaxPurposesPercentage	1.0000
CY2019	bxp	Reit Annual Taxable Income Distribution Requirement Percentage Minimum ReitAnnualTaxableIncomeDistributionRequirementPercentageMinimum	0.90
CY2019	bxp	Company Annual Taxable Income Distribution Percentage CompanyAnnualTaxableIncomeDistributionPercentage	1
CY2019Q4	us-gaap	Land Land	5111606000	USD
CY2018Q4	us-gaap	Land Land	5072568000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	237394000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	148640000	USD
CY2019Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	254828000	USD
CY2018Q4	us-gaap	Land Available For Development LandAvailableForDevelopment	200498000	USD
CY2019Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	13646054000	USD
CY2018Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	13356751000	USD
CY2019Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	2656439000	USD
CY2018Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	2396932000	USD
CY2019Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	44313000	USD
CY2018Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	44351000	USD
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	789736000	USD
CY2018Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	578796000	USD
CY2019Q4	bxp	Real Estate Investment Property At Cost Including Rightof Use Assets RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets	22889010000	USD
CY2018Q4	bxp	Real Estate Investment Property At Cost Including Rightof Use Assets RealEstateInvestmentPropertyAtCostIncludingRightofUseAssets	21649896000	USD
CY2019Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	5266798000	USD
CY2018Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	4897777000	USD
CY2019Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	17622212000	USD
CY2018Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	16752119000	USD
CY2019Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	1155958000	USD
CY2018Q4	us-gaap	Deferred Costs Leasing Gross DeferredCostsLeasingGross	1191297000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	12728000	USD
CY2018Q4	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	12796000	USD
CY2019Q4	bxp	Deferred Costs Gross DeferredCostsGross	1168686000	USD
CY2018Q4	bxp	Deferred Costs Gross DeferredCostsGross	1204093000	USD
CY2019Q4	bxp	Accumulated Amortization Leasing And Financing Costs AccumulatedAmortizationLeasingAndFinancingCosts	479473000	USD
CY2018Q4	bxp	Accumulated Amortization Leasing And Financing Costs AccumulatedAmortizationLeasingAndFinancingCosts	525369000	USD
CY2019Q4	us-gaap	Deferred Costs DeferredCosts	689213000	USD
CY2018Q4	us-gaap	Deferred Costs DeferredCosts	678724000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	17536000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	11001000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	5918000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	4286000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	2510000	USD
CY2019Q4	bxp	Investments In Affiliates Subsidiaries Associates And Joint Venturesnet InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet	933223000	USD
CY2018Q4	bxp	Investments In Affiliates Subsidiaries Associates And Joint Venturesnet InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesnet	931219000	USD
CY2019	bxp	Schedule Of Statements Of Operations Of Unconsolidated Joint Ventures Text Bock ScheduleOfStatementsOfOperationsOfUnconsolidatedJointVenturesTextBock	<div style="line-height:120%;padding-top:18px;text-indent:32px;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">The combined summarized statements of operations of the Company’s unconsolidated joint ventures are as follows:</span><span style="font-family:Arial;font-size:9pt;"> </span></div><div style="line-height:120%;padding-top:12px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;width:99.80506822612085%;border-collapse:collapse;text-align:left;"><tr><td colspan="12"/></tr><tr><td style="width:52%;"/><td style="width:1%;"/><td style="width:12%;"/><td style="width:1%;"/><td style="width:3%;"/><td style="width:1%;"/><td style="width:12%;"/><td style="width:1%;"/><td style="width:3%;"/><td style="width:1%;"/><td style="width:12%;"/><td style="width:1%;"/></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;"> </span></div></td><td colspan="11" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;font-weight:bold;">For the year ended December 31,</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;font-weight:bold;">2019</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;font-weight:bold;">2018</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="text-align:center;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;font-weight:bold;">2017</span></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;"> </span></div></td><td colspan="11" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:8pt;"><span style="font-family:Arial;font-size:8pt;font-weight:bold;">(in thousands)</span></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Total revenue (1)</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>322,817</span></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>271,951</span></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>222,517</span></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Expenses</span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Operating</span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>122,992</span></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>106,610</span></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>90,542</span></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Transaction costs</span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>1,000</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Depreciation and amortization (2)</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>102,296</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>103,079</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>57,079</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Total expenses</span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>226,288</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>209,689</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>147,621</span></span></div></td><td style="vertical-align:bottom;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Other income (expense)</span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:top;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Gains on sales of real estate (3)</span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>32,706</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>16,951</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>—</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:28px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Interest expense</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>(84,409</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">)</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>(71,308</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">)</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>(46,371</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">)</span></div></td></tr><tr><td style="vertical-align:top;padding-left:52px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Net income</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>44,826</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>7,905</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>28,525</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:20px;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Company’s share of net income</span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>24,423</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>8,084</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>18,439</span></span></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Basis differential (3)(4)</span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>22,169</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>(5,862</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">)</span></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>(7,207</span></span></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">)</span></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">Income from unconsolidated joint ventures</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>46,592</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>2,222</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"> </span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">$</span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;"><span>11,232</span></span></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div></td></tr></table></div></div><div style="line-height:120%;font-size:10pt;"><span style="font-family:Arial;font-size:10pt;">_______________ </span></div><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:36px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:9pt;padding-left:12px;"><span style="font-family:Arial;font-size:9pt;">(1)</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;">Includes straight-line rent adjustments of approximately </span><span style="font-family:Arial;font-size:9pt;"><span>$32.4 million</span></span><span style="font-family:Arial;font-size:9pt;">, </span><span style="font-family:Arial;font-size:9pt;"><span>$15.9 million</span></span><span style="font-family:Arial;font-size:9pt;"> and </span><span style="font-family:Arial;font-size:9pt;"><span>$21.7 million</span></span><span style="font-family:Arial;font-size:9pt;"> for the years ended </span><span style="font-family:Arial;font-size:9pt;">December 31, 2019</span><span style="font-family:Arial;font-size:9pt;">, </span><span style="font-family:Arial;font-size:9pt;">2018</span><span style="font-family:Arial;font-size:9pt;"> and </span><span style="font-family:Arial;font-size:9pt;">2017</span><span style="font-family:Arial;font-size:9pt;">, respectively. </span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:36px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:9pt;padding-left:12px;"><span style="font-family:Arial;font-size:9pt;">(2)</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;">During the year ended December 31, 2018, the joint venture that owns Metropolitan Square in Washington, DC, commenced a renovation project and recorded accelerated depreciation expense of approximately </span><span style="font-family:Arial;font-size:9pt;"><span>$22.4 million</span></span><span style="font-family:Arial;font-size:9pt;"> related to the remaining book value of the assets to be replaced. The Company’s share of the accelerated depreciation expense totaled approximately </span><span style="font-family:Arial;font-size:9pt;"><span>$4.5 million</span></span><span style="font-family:Arial;font-size:9pt;">.</span></div></td></tr></table><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman; font-size:10pt;"><tr><td style="width:36px;"/><td/></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:9pt;padding-left:12px;"><span style="font-family:Arial;font-size:9pt;">(3)</span></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;">For the year ended December 31, 2019, represents the gain on sale of 540 Madison Avenue recognized by the joint venture, as described below. 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 </span><span style="font-family:Arial;font-size:9pt;"><span>$47.2 million</span></span><span style="font-family:Arial;font-size:9pt;"> 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 from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.</span></div></td></tr></table><div style="line-height:120%;font-size:9pt;padding-left:12px;"><span style="font-family:Arial;font-size:9pt;">(4)</span></div><div style="line-height:120%;text-align:left;font-size:9pt;"><span style="font-family:Arial;font-size:9pt;">Includes straight-line rent adjustments of approximately </span><span style="font-family:Arial;font-size:9pt;"><span>$2.1 million</span></span><span style="font-family:Arial;font-size:9pt;">, </span><span style="font-family:Arial;font-size:9pt;"><span>$2.4 million</span></span><span style="font-family:Arial;font-size:9pt;"> and </span><span style="font-family:Arial;font-size:9pt;"><span>$1.9 million</span></span><span style="font-family:Arial;font-size:9pt;"> for the years ended December 31, 2019, 2018 and 2017, respectively. Also includes net above-/below-market rent adjustments of approximately </span><span style="font-family:Arial;font-size:9pt;"><span>$1.7 million</span></span><span style="font-family:Arial;font-size:9pt;">, </span><span style="font-family:Arial;font-size:9pt;"><span>$1.6 million</span></span><span style="font-family:Arial;font-size:9pt;"> and </span><span style="font-family:Arial;font-size:9pt;"><span>$2.9 million</span></span><span style="font-family:Arial;font-size:9pt;"> for the years ended December 31, 2019, 2018 and 2017, respectively. </span></div>
CY2019Q4	us-gaap	Secured Debt SecuredDebt	2900000000	USD
CY2018Q4	us-gaap	Secured Debt SecuredDebt	3000000000.0	USD
CY2019Q4	bxp	Number Of Mortgage Loans Accounted For Fair Value NumberOfMortgageLoansAccountedForFairValue	0
CY2017	bxp	Nterest Expense Decrease Due To Recording Mortgage Loans At Fair Value NterestExpenseDecreaseDueToRecordingMortgageLoansAtFairValue	19600000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	17168000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	17276000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	614710000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	2300000000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	2949154000	USD
CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	26746000	USD
CY2019Q4	us-gaap	Secured Debt SecuredDebt	2922408000	USD
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	us-gaap	Line Of Credit Facility Covenant Compliance LineOfCreditFacilityCovenantCompliance	At December 31, 2019, Boston Properties Limited Partnership was in compliance with each of these financial and other covenant requirements.
CY2019Q4	bxp	Letter Of Credit And Performance Obligation LetterOfCreditAndPerformanceObligation	21000000.0	USD
CY2019Q4	bxp	Insurance Policy Limit InsurancePolicyLimit	1000000000.0	USD
CY2019Q4	bxp	Insurance Policy Limit InsurancePolicyLimit	1000000000.0	USD
CY2019	bxp	Per Occurrence Limit For Nbcr Coverage PerOccurrenceLimitForNbcrCoverage	1000000000.0	USD
CY2019Q4	bxp	Program Trigger Value ProgramTriggerValue	180000000	USD
CY2019	bxp	Program Trigger Coinsurance ProgramTriggerCoinsurance	0.19
CY2019	bxp	Earthquake Deductible Insurance Percentage Of Value Of The Affected Property San Franciscoand Los Angeles EarthquakeDeductibleInsurancePercentageOfValueOfTheAffectedPropertySanFranciscoandLosAngeles	0.03
CY2019	bxp	Per Occurrence Limit Of Earth Quake Insurance San Franciscoand Los Angeles PerOccurrenceLimitOfEarthQuakeInsuranceSanFranciscoandLosAngeles	240000000	USD
CY2019	bxp	Annual Aggregate Limit Of Earth Quake Insurance San Franciscoand Los Angeles AnnualAggregateLimitOfEarthQuakeInsuranceSanFranciscoandLosAngeles	240000000	USD
CY2019	bxp	Amount Of Earthquake Insurance Provided By Ixpllc As Direct Insurer San Franciscoand Los Angeles AmountOfEarthquakeInsuranceProvidedByIXPLLCAsDirectInsurerSanFranciscoandLosAngeles	20000000	USD
CY2019Q4	us-gaap	Minority Interest In Limited Partnerships MinorityInterestInLimitedPartnerships	1700000000	USD
CY2018	us-gaap	Conversion Of Stock Shares Issued1 ConversionOfStockSharesIssued1	83136	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	154790298	shares
CY2019Q4	us-gaap	General Partners Capital Account Units Outstanding GeneralPartnersCapitalAccountUnitsOutstanding	1726980	shares
CY2019Q4	us-gaap	Limited Partners Capital Account Units Outstanding LimitedPartnersCapitalAccountUnitsOutstanding	153063318	shares
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	145088	shares
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2019	us-gaap	Conversion Of Stock Shares Issued1 ConversionOfStockSharesIssued1	144481	shares
CY2019Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.98
CY2019Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.95
CY2019Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.95
CY2019Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.95
CY2019Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.95
CY2018Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.95
CY2018Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.80
CY2018Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.80
CY2018Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.80
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	2088171000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	2106963000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	2015031000	USD
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CY2019Q4	us-gaap	Revenues Revenues	757501000	USD
CY2019Q1	us-gaap	Income Loss Before Gain Or Loss On Sale Of Properties Extraordinary Items And Cumulative Effects Of Accounting Changes IncomeLossBeforeGainOrLossOnSaleOfPropertiesExtraordinaryItemsAndCumulativeEffectsOfAccountingChanges	131159000	USD
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CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	148529000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.14
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CY2019Q4	srt	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	2922408000	USD
CY2019Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	5024060000	USD
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CY2019Q4	bxp	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndImprovements	5474337000	USD
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CY2019Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	22844697000	USD
CY2019Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	5239179000	USD
CY2019Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	44313000	USD
CY2019Q4	bxp	Real Estate Aggregate Cost For Tax Purposes RealEstateAggregateCostForTaxPurposes	18600000000	USD
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CY2019Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	26700000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	148640000	USD
CY2018Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	21605545000	USD
CY2017Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	21058714000	USD
CY2016Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	20114576000	USD
CY2019	bxp	Real Estate Improvements Excluding Furniture Fixtures And Equipment RealEstateImprovementsExcludingFurnitureFixturesAndEquipment	1671898000	USD
CY2018	bxp	Real Estate Improvements Excluding Furniture Fixtures And Equipment RealEstateImprovementsExcludingFurnitureFixturesAndEquipment	1043379000	USD
CY2017	bxp	Real Estate Improvements Excluding Furniture Fixtures And Equipment RealEstateImprovementsExcludingFurnitureFixturesAndEquipment	1099286000	USD
CY2019	bxp	Real Estate Cost Of Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateCostOfRealEstateSoldExcludingFurnitureFixturesAndEquipment	-432746000	USD
CY2018	bxp	Real Estate Cost Of Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateCostOfRealEstateSoldExcludingFurnitureFixturesAndEquipment	-496548000	USD
CY2017	bxp	Real Estate Cost Of Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateCostOfRealEstateSoldExcludingFurnitureFixturesAndEquipment	-155148000	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
CY2017Q4	bxp	Real Estate Gross At Carrying Value Excluding Furniture Fixtures And Equipment RealEstateGrossAtCarryingValueExcludingFurnitureFixturesAndEquipment	21058714000	USD
CY2018Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	4871102000	USD
CY2017Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	4566570000	USD
CY2016Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	4201891000	USD
CY2019	bxp	Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationDepreciationExpenseExcludingFurnitureFixturesAndEquipment	564938000	USD
CY2018	bxp	Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationDepreciationExpenseExcludingFurnitureFixturesAndEquipment	533342000	USD
CY2017	bxp	Real Estate Accumulated Depreciation Depreciation Expense Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationDepreciationExpenseExcludingFurnitureFixturesAndEquipment	497059000	USD
CY2019	bxp	Real Estate Accumulated Depreciation Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationRealEstateSoldExcludingFurnitureFixturesAndEquipment	-196861000	USD
CY2018	bxp	Real Estate Accumulated Depreciation Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationRealEstateSoldExcludingFurnitureFixturesAndEquipment	-228810000	USD
CY2017	bxp	Real Estate Accumulated Depreciation Real Estate Sold Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationRealEstateSoldExcludingFurnitureFixturesAndEquipment	-132380000	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
CY2017Q4	bxp	Real Estate Accumulated Depreciation Excluding Furniture Fixtures And Equipment RealEstateAccumulatedDepreciationExcludingFurnitureFixturesAndEquipment	4566570000	USD

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$BXP
BXP, Inc. Stock $bxp

2019 Q4 Form 10-K Financial Statement

#000165642320000007 Filed on March 02, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXP BXP, Inc. Stock $bxp

2019 Q4 Form 10-K Financial Statement

#000165642320000007 Filed on March 02, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$BXP
BXP, Inc. Stock $bxp