XML 50 R33.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Organization (Details) ft² in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 ft² a Real_Estate_Properties series yr shares | Dec. 31, 2015 shares
Real Estate Properties [Line Items] |  |
Restriction on redemption of OP units from date of issuance (years) | yr | 1 |
One OP unit is equivalent to one share of Common Stock (in shares) | shares | 1 |
OP unit conversion rate (in shares) | shares | 1 |
Number Of Series Of Preferred Units Outstanding | series | 1 |
Area of undeveloped land parcels owned (in acres) | a | 471.6 |
Commercial Real Estate Properties [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 168 |
Net Rentable Area (in sf) | ft² | 46.5 |
Total Properties Under Construction [ Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 8 |
Net Rentable Area (in sf) | ft² | 3.8 |
Total Office Properties [ Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 158 |
Office Properties Under Construction [ Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 6 |
Hotel Property [ Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 1 |
Retail Properties [ Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 5 |
Residential Properties [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 4 |
Residential Properties Under Construction [Member] |  |
Real Estate Properties [Line Items] |  |
Number of real estate properties | 2 |
Series B Cumulative Redeemable Preferred Stock [Member] |  |
Real Estate Properties [Line Items] |  |
Ratio of depository shares to shares of Series B Preferred Stock | 0.01 |
Series B, Shares Outstanding (in shares) | shares | 80,000 | 80,000
Series B, Dividend Rate, Percentage | 5.25% |
Depository shares of Series B Cumulative Redeemable Preferred [Member] |  |
Real Estate Properties [Line Items] |  |
Series B, Shares Outstanding (in shares) | shares | 8,000,000 |
Series B Preferred Units [Member] |  |
Real Estate Properties [Line Items] |  |
Series B, Shares Outstanding (in shares) | shares | 80,000 |
Boston Properties Inc |  |
Real Estate Properties [Line Items] |  |
General and limited partnership interest in the operating partnership (percent) | 89.50% | 89.50%

X
- Definition Area Of Undeveloped Land + References No definition available. + Details
Name: | bxp_AreaOfUndevelopedLand
Namespace Prefix: | bxp_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Common Stock Conversion Rate + References No definition available. + Details
Name: | bxp_CommonStockConversionRate
Namespace Prefix: | bxp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Series Of Preferred Units Outstanding. + References No definition available. + Details
Name: | bxp_NumberOfSeriesOfPreferredUnitsOutstanding
Namespace Prefix: | bxp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition OP Unit Conversion Rate. + References No definition available. + Details
Name: | bxp_OpUnitConversionRate
Namespace Prefix: | bxp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of depository shares to shares of Series B Preferred Stock + References No definition available. + Details
Name: | bxp_RatioOfDepositorySharesToSharesOfSeriesBPreferredStock
Namespace Prefix: | bxp_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Restriction On Redemption Of OP Units From Date Of Issuance In Years + References No definition available. + Details
Name: | bxp_RestrictionOnRedemptionOfOpUnitsFromDateOfIssuanceInYears
Namespace Prefix: | bxp_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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 number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
Name: | us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
Name: | us-gaap_PreferredStockSharesOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bxp_PropertiesUnderConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bxp_TotalOfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bxp_OfficePropertiesUnderConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bxp_HotelPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bxp_RetailPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=bxp_ResidentialPropertiesUnderConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=bxp_SeriesBCumulativeRedeemablePreferredStockUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=bxp_DepositorySharesOfSeriesBCumulativeRedeemablePreferredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=bxp_SeriesBPreferredUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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