XML 51 R34.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Real Estate Narrative (Details) |  |  |  | 3 Months Ended | 5 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2017 USD ($) a | Jun. 13, 2017 USD ($) ft² | Apr. 19, 2017 USD ($) a | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Jun. 13, 2017 USD ($) ft² | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 16, 2017 ft² | Aug. 24, 2017 ft² yr | Jun. 29, 2017 USD ($) yr apartments | May 27, 2017 ft² | May 15, 2017 USD ($) ft² | Apr. 06, 2017 ft²
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 657,712,000 | $ 625,228,000 |  |  | $ 1,946,847,000 | $ 1,914,759,000 |  |  |  |  |  |
Earnings |  |  |  | 233,729,000 | 157,605,000 |  |  | 678,644,000 | 626,082,000 |  |  |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  |  | 29,810,000 | 122,750,000 |  |  |  |  |  |
Gains on sales of real estate |  |  |  | 2,891,000 | 12,983,000 |  |  | 6,791,000 | 80,606,000 |  |  |  |  |  |
145 Broadway [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 485,000
Reservoir Place North [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 73,000 |  |
6595 Springfield Center Drive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  | 623,000 |  |  |  |
Term of Lease Signed (in years) | yr |  |  |  |  |  |  |  |  |  |  | 15 |  |  |  |
888 Boylston Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  | 417,000 |  |  |  |  |
MacArthur Transit Center [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of Lease Signed (in years) | yr |  |  |  |  |  |  |  |  |  |  |  | 99 |  |  |
Number of apartment units | apartments |  |  |  |  |  |  |  |  |  |  |  | 402 |  |  |
Capital Lease Obligations |  |  |  |  |  |  |  |  |  |  |  | $ 28,962,000 |  |  |
103 Carnegie Center [Member] | 103 Carnegie Center [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Earnings |  |  |  |  |  | $ (100,000) |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  | 96,000 |
Aggregate purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,800,000 |
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | 657,712,000 | 625,228,000 |  |  | 1,946,847,000 | 1,914,759,000 |  |  |  |  |  |
Earnings |  |  |  | 235,683,000 | 162,771,000 |  |  | 684,830,000 | 635,219,000 |  |  |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  |  | 29,810,000 | 122,750,000 |  |  |  |  |  |
Gains on sales of real estate |  |  |  | $ 2,891,000 | 12,983,000 |  |  | $ 7,368,000 | 82,775,000 |  |  |  |  |  |
30 Shattuck Road [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  | 9.5 |  |  |  |  |  |  |  |  |  |  |  |
Contractual Sales Price |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of real estate |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate |  |  | $ 3,700,000 |  |  |  |  |  |  |  |  |  |  |  |
40 Shattuck Road [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 122,000 |  |  |  |  | 122,000 |  |  |  |  |  |  |  |
Contractual Sales Price |  | $ 12,000,000 |  |  |  |  | $ 12,000,000 |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | $ (33,000) |  | $ (28,000) |  | $ (18,000) |  |  |  |  |  |
Proceeds from sales of real estate |  | 11,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate |  | 28,000 |  |  |  |  |  |  |  |  |  |  |  |  |
40 Shattuck Road [Member] | Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Reston Eastgate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a | 21.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Sales Price | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of real estate | 13,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains on sales of real estate | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Aggregate purchase price + References No definition available. + Details
Name: | bxp_Aggregatepurchaseprice
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Contractual Sales Price + References No definition available. + Details
Name: | bxp_ContractualSalesPrice
Namespace Prefix: | bxp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of apartment units + References No definition available. + Details
Name: | bxp_Numberofapartmentunits
Namespace Prefix: | bxp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of Lease Signed (in years) + References No definition available. + Details
Name: | bxp_TermofLeaseSignedinyears
Namespace Prefix: | bxp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
Name: | us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of operating income (loss) attributable to disposal group, including, but not limited to, discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of gain (loss) on sale of properties during the reporting period gross of the applicable income taxes realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 974 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-15.(a)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027 + Details
Name: | us-gaap_GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net rentable area for properties owned. + References No definition available. + Details
Name: | us-gaap_NetRentableArea
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfRealEstateHeldforinvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_OneFourFiveBroadwayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_ReservoirPlaceNorthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_SixFiveNineFiveSpringfieldCenterDriveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_EightEightEightBoylstonStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_MacArthurTransitCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bxp_OneZeroThreeCarnegieCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=bxp_OneZeroThreeCarnegieCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bxp_ThirtyShattuckRoadMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bxp_FortyshattuckMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=bxp_RestonEastgateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |