XML 48 R22.htm IDEA: XBRL DOCUMENT
v3.20.1

Summary Of Significant Accounting Policies (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2020
Summary Of Significant Accounting Policies [Line Items] |
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] | The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents the financial instruments that are being valued for disclosure purposes as well as the Level they are categorized at (as defined in Accounting Standards Codification (“ASC”) 820 “Fair Value Measurements and Disclosures” (“ASC 820”)).
Financial Instrument | Level
Unsecured senior notes (1) | Level 1
Related party note receivable | Level 3
Note receivable | Level 3
Mortgage notes payable | Level 3
Unsecured term loan / line of credit | Level 3
_______________ (1) If trading value for the period is low, the valuation could be categorized as Level 2. Because the Company’s valuations of its financial instruments are based on the above Levels and involve the use of estimates, the actual fair values of its financial instruments may differ materially from those estimates. The following table identifies the range and weighted average of significant unobservable inputs for the Company’s Level 3 fair value measured instruments.
Financial Instrument | Level | Range | Weighted Average
Related party note receivable | Level 3 | 4.49% | 4.49%
Note receivable | Level 3 | 3.62% | 3.62%
Mortgage notes payable | Level 3 | 2.82% - 3.25% | 2.91%
Unsecured term loan / line of credit | Level 3 | 1.84% | 1.84%
Fair Value, by Balance Sheet Grouping [Table Text Block] | The following table presents the aggregate carrying value of the Company’s related party note receivable, net, note receivable, net, mortgage notes payable, net, unsecured senior notes, net, unsecured line of credit and unsecured term loan, net and the Company’s corresponding estimate of fair value as of March 31, 2020 and December 31, 2019 (in thousands):
| March 31, 2020 |  | December 31, 2019
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Related party note receivable, net | $ | 78,800 |  |  | $ | 83,707 |  |  | $ | 80,000 |  |  | $ | 81,931 |
Note receivable, net | 15,794 |  |  | 15,593 |  |  | 15,920 |  |  | 14,978 |
Total | $ | 94,594 |  |  | $ | 99,300 |  |  | $ | 95,920 |  |  | $ | 96,909 |
Mortgage notes payable, net | $ | 2,919,157 |  |  | $ | 3,054,533 |  |  | $ | 2,922,408 |  |  | $ | 2,984,956 |
Unsecured senior notes, net | 8,393,009 |  |  | 8,449,511 |  |  | 8,390,459 |  |  | 8,826,375 |
Unsecured line of credit | 250,000 |  |  | 249,873 |  |  | — |  |  | — |
Unsecured term loan, net | 499,058 |  |  | 500,506 |  |  | 498,939 |  |  | 500,561 |
Total | $ | 12,061,224 |  |  | $ | 12,254,423 |  |  | $ | 11,811,806 |  |  | $ | 12,311,892 |

X
- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | bxp_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | bxp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration