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Segment Information | 12 Months Ended
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Dec. 31, 2020
Segment Reporting [Abstract] |
Segment Reporting Disclosure [Text Block] | 13. Segment Information The following tables present reconciliations of Net Income Attributable to Boston Properties, Inc. Common Shareholders to the Company’s share of Net Operating Income and Net Income Attributable to Boston Properties Limited Partnership Common Unitholders to the Company’s share of Net Operating Income for the years ended December 31, 2020, 2019 and 2018. Boston Properties, Inc.
|  |  |  | Year ended December 31,
|  |  |  |  |  | 2020 |  | 2019 |  | 2018
|  |  |  |  | (in thousands)
Net income attributable to Boston Properties, Inc. common shareholders |  |  |  |  |  | $ | 862,227 |  |  | $ | 511,034 |  |  | $ | 572,347 |
Add: |  |  |  |  |  |  |  |  |  |
Preferred dividends |  |  |  |  |  | 10,500 |  |  | 10,500 |  |  | 10,500 |
Noncontrolling interest—common units of the Operating Partnership |  |  |  |  |  | 97,704 |  |  | 59,345 |  |  | 66,807 |
Noncontrolling interests in property partnerships |  |  |  |  |  | 48,260 |  |  | 71,120 |  |  | 62,909 |
Interest expense |  |  |  |  |  | 431,717 |  |  | 412,717 |  |  | 378,168 |
Loss from early extinguishment of debt |  |  |  |  |  | — |  |  | 29,540 |  |  | 16,490 |
Impairment loss |  |  |  |  |  | — |  |  | 24,038 |  |  | 11,812 |
Net operating income from unconsolidated joint ventures |  |  |  |  |  | 94,943 |  |  | 97,716 |  |  | 79,893 |
Depreciation and amortization expense |  |  |  |  |  | 683,751 |  |  | 677,764 |  |  | 645,649 |
Transaction costs |  |  |  |  |  | 1,531 |  |  | 1,984 |  |  | 1,604 |
Payroll and related costs from management services contracts |  |  |  |  |  | 11,626 |  |  | 10,386 |  |  | 9,590 |
General and administrative expense |  |  |  |  |  | 133,112 |  |  | 140,777 |  |  | 121,722 |
Less: |  |  |  |  |  |  |  |  |  |
Net operating income attributable to noncontrolling interests in property partnerships |  |  |  |  |  | 162,887 |  |  | 183,989 |  |  | 177,365 |
Gains (losses) from investments in securities |  |  |  |  |  | 5,261 |  |  | 6,417 |  |  | (1,865) |
Interest and other income (loss) |  |  |  |  |  | 5,953 |  |  | 18,939 |  |  | 10,823 |
Gains on sales of real estate |  |  |  |  |  | 618,982 |  |  | 709 |  |  | 182,356 |
Income (loss) from unconsolidated joint ventures |  |  |  |  |  | (85,110) |  |  | 46,592 |  |  | 2,222 |
Direct reimbursements of payroll and related costs from management services contracts |  |  |  |  |  | 11,626 |  |  | 10,386 |  |  | 9,590 |
Development and management services revenue |  |  |  |  |  | 29,641 |  |  | 40,039 |  |  | 45,158 |
Company’s share of Net Operating Income |  |  |  |  |  | $ | 1,626,131 |  |  | $ | 1,739,850 |  |  | $ | 1,551,842 |
Boston Properties Limited Partnership
|  |  |  | Year ended December 31,
|  |  |  |  |  | 2020 |  | 2019 |  | 2018
|  |  |  |  |  | (in thousands)
Net income attributable to Boston Properties Limited Partnership common unitholders |  |  |  |  |  | $ | 979,979 |  |  | $ | 580,102 |  |  | $ | 656,903 |
Add: |  |  |  |  |  |  |  |  |  |
Preferred distributions |  |  |  |  |  | 10,500 |  |  | 10,500 |  |  | 10,500 |
Noncontrolling interests in property partnerships |  |  |  |  |  | 48,260 |  |  | 71,120 |  |  | 62,909 |
Interest expense |  |  |  |  |  | 431,717 |  |  | 412,717 |  |  | 378,168 |
Loss from early extinguishment of debt |  |  |  |  |  | — |  |  | 29,540 |  |  | 16,490 |
Impairment loss |  |  |  |  |  | — |  |  | 22,272 |  |  | 10,181 |
Net operating income from unconsolidated joint ventures |  |  |  |  |  | 94,943 |  |  | 97,716 |  |  | 79,893 |
Depreciation and amortization expense |  |  |  |  |  | 676,666 |  |  | 669,956 |  |  | 637,891 |
Transaction costs |  |  |  |  |  | 1,531 |  |  | 1,984 |  |  | 1,604 |
Payroll and related costs from management services contracts |  |  |  |  |  | 11,626 |  |  | 10,386 |  |  | 9,590 |
General and administrative expense |  |  |  |  |  | 133,112 |  |  | 140,777 |  |  | 121,722 |
Less: |  |  |  |  |  |  |  |  |  |
Net operating income attributable to noncontrolling interests in property partnerships |  |  |  |  |  | 162,887 |  |  | 183,989 |  |  | 177,365 |
Gains (losses) from investments in securities |  |  |  |  |  | 5,261 |  |  | 6,417 |  |  | (1,865) |
Interest and other income (loss) |  |  |  |  |  | 5,953 |  |  | 18,939 |  |  | 10,823 |
Gains on sales of real estate |  |  |  |  |  | 631,945 |  |  | 858 |  |  | 190,716 |
Income (loss) from unconsolidated joint ventures |  |  |  |  |  | (85,110) |  |  | 46,592 |  |  | 2,222 |
Direct reimbursements of payroll and related costs from management services contracts |  |  |  |  |  | 11,626 |  |  | 10,386 |  |  | 9,590 |
Development and management services revenue |  |  |  |  |  | 29,641 |  |  | 40,039 |  |  | 45,158 |
Company’s share of Net Operating Income |  |  |  |  |  | $ | 1,626,131 |  |  | $ | 1,739,850 |  |  | $ | 1,551,842 |
Net operating income (“NOI”) is a non-GAAP financial measure equal to net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders, as applicable, the most directly comparable GAAP financial measures, plus (1) preferred dividends/distributions, net income attributable to noncontrolling interests, interest expense, loss from early extinguishment of debt, impairment loss, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts and corporate general and administrative expense less (2) gains (losses) from investments in securities, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue. The Company believes NOI is useful to investors as a performance measure and believes it provides useful information to investors regarding its results of operations and financial condition because, when compared across periods, it reflects the impact on operations from trends in occupancy rates, rental rates, operating costs and acquisition and development activity on an unleveraged basis, providing perspective not immediately apparent from net income attributable to Boston Properties, Inc. common shareholders and net income attributable to Boston Properties Limited Partnership common unitholders. For example, interest expense is not necessarily linked to the operating performance of a real estate asset and is often incurred at the corporate level as opposed to the property level. Similarly, interest expense may be incurred at the property level even though the financing proceeds may be used at the corporate level (e.g., used for other investment activity). In addition, depreciation and amortization expense, because of historical cost accounting and useful life estimates, may distort operating performance measures at the property level. NOI presented by the Company may not be comparable to NOI reported by other REITs or real estate companies that define NOI differently. The Company’s internal reporting utilizes its share of NOI, which includes its share of NOI from consolidated and unconsolidated joint ventures, which is a non-GAAP financial measure that is calculated as the consolidated amount, plus the Company’s share of the amount from the Company’s unconsolidated joint ventures (calculated based upon the Company’s economic percentage ownership interest and, in some cases, after priority allocations), minus the Company’s partners’ share of the amount from the Company’s consolidated joint ventures (calculated based upon the partners’ economic percentage ownership interests and, in some cases, after priority allocations, income allocation to private REIT shareholders and their share of fees due to the Company). The Company’s share of NOI from unconsolidated joint ventures does not include impairment losses on its investments in unconsolidated joint ventures or its share of gains on sales of real estate from unconsolidated joint ventures, both of which are included within Income From Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations. Management utilizes its share of NOI in assessing its performance as the Company has several significant joint ventures and, in some cases, the Company exercises significant influence over, but does not control, the joint venture, in which case GAAP requires that the Company account for the joint venture entity using the equity method of accounting and the Company does not consolidate it for financial reporting purposes. In other cases, GAAP requires that the Company consolidate the venture even though the Company’s partner(s) owns a significant percentage interest. As a result, the presentations of the Company’s share of NOI should not be considered a substitute for, and should only be considered together with and as a supplement to, the Company’s financial information presented in accordance with GAAP. Asset information by segment is not reported because the Company does not use this measure to assess performance. Therefore, depreciation and amortization expense is not allocated among segments. Preferred dividends/distributions, interest expense, loss from early extinguishment of debt, impairment loss, depreciation and amortization expense, transaction costs, payroll and related costs from management services contracts, corporate general and administrative expense, gains (losses) from investments in securities, interest and other income (loss), gains on sales of real estate, income (loss) from unconsolidated joint ventures, direct reimbursements of payroll and related costs from management services contracts and development and management services revenue are not included in NOI and are provided as reconciling items to the Company’s reconciliations of its share of NOI to net income attributable to common shareholders/unitholders. The Company’s segments are based on the Company’s method of internal reporting which classifies its operations by geographic area. The Company’s segments by geographic area are Boston, Los Angeles, New York, San Francisco and Washington, DC. The Company also presents information for each segment by property type, including Office, Residential and Hotel. Included within the Office property type are commercial office and retail leases, as well as parking revenue. Upon the adoption of ASC 842, any write-off for bad debt, including accrued rent, will be recorded as a reduction to lease revenue. As a result of COVID-19, during the year ended December 31, 2020, the Company wrote off approximately $67.7 million related to accrued rent balances and approximately $22.6 million related to accounts receivable balances. The write-offs were for tenants, primarily in the retail, entertainment and co-working sectors, that either terminated their leases or that the Company considered their accrued rent and/or accounts receivable balances no longer probable of collection. In addition, parking and other revenue for the year ended December 31, 2020 decreased by approximately $32.9 million compared to 2019. These decreases were primarily in transient and monthly parking revenue. The degree to which the Company’s commercial and retail tenants’ and parking operators’ businesses are, or will continue to be, negatively impacted by COVID-19, including by measures intended to reduce its spread, such as mandatory business closures and “stay-at-home” orders, could result in a reduction in the Company’s cash flows or require that the Company write off additional accrued rent and/or accounts receivable balances, and this could have a material adverse effect on lease revenue and thus the results of the Company’s Office property type. The Boston Marriott Cambridge closed in March 2020 due to COVID-19. The hotel re-opened on October 2, 2020 and has been operating at a diminished occupancy due to the continued impacts that COVID-19 has had on business and leisure travel. The closing of the hotel for more than two fiscal quarters, weak demand and low occupancy since its re-opening, have had, and are expected to continue to have, a material adverse effect on the hotel’s operations and thus the results of the Company’s Hotel property type. Information by geographic area and property type (dollars in thousands): For the year ended December 31, 2020:
| Boston |  | Los Angeles |  | New York |  | San Francisco |  | Washington, DC |  | Total
Rental Revenue: (1) |  |  |  |  |  |  |  |  |  |  |
Office | $ | 897,915 |  |  | $ | — |  |  | $ | 935,966 |  |  | $ | 508,327 |  |  | $ | 336,587 |  |  | $ | 2,678,795 |
Residential | 13,616 |  |  | — |  |  | — |  |  | 155 |  |  | 24,375 |  |  | 38,146 |
Hotel | 7,478 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 7,478 |
Total | 919,009 |  |  | — |  |  | 935,966 |  |  | 508,482 |  |  | 360,962 |  |  | 2,724,419 |
% of Grand Totals | 33.73 | % |  | — | % |  | 34.36 | % |  | 18.66 | % |  | 13.25 | % |  | 100.00 | %
Rental Expenses: |  |  |  |  |  |  |  |  |  |  |
Office | 318,509 |  |  | — |  |  | 384,753 |  |  | 163,156 |  |  | 132,051 |  |  | 998,469 |
Residential | 5,378 |  |  | — |  |  | — |  |  | 2,261 |  |  | 11,100 |  |  | 18,739 |
Hotel | 13,136 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 13,136 |
Total | 337,023 |  |  | — |  |  | 384,753 |  |  | 165,417 |  |  | 143,151 |  |  | 1,030,344 |
% of Grand Totals | 32.71 | % |  | — | % |  | 37.35 | % |  | 16.05 | % |  | 13.89 | % |  | 100.00 | %
Net operating income | $ | 581,986 |  |  | $ | — |  |  | $ | 551,213 |  |  | $ | 343,065 |  |  | $ | 217,811 |  |  | $ | 1,694,075 |
% of Grand Totals | 34.35 | % |  | — | % |  | 32.54 | % |  | 20.25 | % |  | 12.86 | % |  | 100.00 | %
Less: Net operating income attributable to noncontrolling interests in property partnerships | (41,849) |  |  | — |  |  | (121,038) |  |  | — |  |  | — |  |  | (162,887) |
Add: Company’s share of net operating income from unconsolidated joint ventures | 10,765 |  |  | 57,907 |  |  | (5,326) |  |  | 14,928 |  |  | 16,669 |  |  | 94,943 |
Company’s share of net operating income | $ | 550,902 |  |  | $ | 57,907 |  |  | $ | 424,849 |  |  | $ | 357,993 |  |  | $ | 234,480 |  |  | $ | 1,626,131 |
% of Grand Totals | 33.88 | % |  | 3.56 | % |  | 26.12 | % |  | 22.02 | % |  | 14.42 | % |  | 100.00 | %
_______________ (1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations. For the year ended December 31, 2019:
| Boston |  | Los Angeles |  | New York |  | San Francisco |  | Washington, DC |  | Total
Rental Revenue: (1) |  |  |  |  |  |  |  |  |  |  |
Office | $ | 895,098 |  |  | $ | — |  |  | $ | 1,011,912 |  |  | $ | 533,189 |  |  | $ | 384,435 |  |  | $ | 2,824,634 |
Residential | 13,786 |  |  | — |  |  | — |  |  | — |  |  | 23,128 |  |  | 36,914 |
Hotel | 48,589 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 48,589 |
Total | 957,473 |  |  | — |  |  | 1,011,912 |  |  | 533,189 |  |  | 407,563 |  |  | 2,910,137 |
% of Grand Totals | 32.90 | % |  | — | % |  | 34.78 | % |  | 18.32 | % |  | 14.00 | % |  | 100.00 | %
Rental Expenses: |  |  |  |  |  |  |  |  |  |  |
Office | 322,282 |  |  | — |  |  | 389,532 |  |  | 177,994 |  |  | 144,217 |  |  | 1,034,025 |
Residential | 5,071 |  |  | — |  |  | — |  |  | — |  |  | 10,914 |  |  | 15,985 |
Hotel | 34,004 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 34,004 |
Total | 361,357 |  |  | — |  |  | 389,532 |  |  | 177,994 |  |  | 155,131 |  |  | 1,084,014 |
% of Grand Totals | 33.34 | % |  | — | % |  | 35.93 | % |  | 16.42 | % |  | 14.31 | % |  | 100.00 | %
Net operating income | $ | 596,116 |  |  | $ | — |  |  | $ | 622,380 |  |  | $ | 355,195 |  |  | $ | 252,432 |  |  | $ | 1,826,123 |
% of Grand Totals | 32.64 | % |  | — | % |  | 34.09 | % |  | 19.45 | % |  | 13.82 | % |  | 100.00 | %
Less: Net operating income attributable to noncontrolling interests in property partnerships | (40,109) |  |  | — |  |  | (143,432) |  |  | (448) |  |  | — |  |  | (183,989) |
Add: Company’s share of net operating income from unconsolidated joint ventures | 5,494 |  |  | 61,338 |  |  | 4,174 |  |  | — |  |  | 26,710 |  |  | 97,716 |
Company’s share of net operating income | $ | 561,501 |  |  | $ | 61,338 |  |  | $ | 483,122 |  |  | $ | 354,747 |  |  | $ | 279,142 |  |  | $ | 1,739,850 |
% of Grand Totals | 32.27 | % |  | 3.53 | % |  | 27.77 | % |  | 20.39 | % |  | 16.04 | % |  | 100.00 | %
_______________ (1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations. For the year ended December 31, 2018:
| Boston |  | Los Angeles |  | New York |  | San Francisco |  | Washington, DC |  | Total
Rental Revenue: (1) |  |  |  |  |  |  |  |  |  |  |
Office | $ | 838,341 |  |  | $ | — |  |  | $ | 959,050 |  |  | $ | 397,180 |  |  | $ | 396,088 |  |  | $ | 2,590,659 |
Residential | 6,694 |  |  | — |  |  | — |  |  | — |  |  | 15,857 |  |  | 22,551 |
Hotel | 49,118 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 49,118 |
Total | 894,153 |  |  | — |  |  | 959,050 |  |  | 397,180 |  |  | 411,945 |  |  | 2,662,328 |
% of Grand Totals | 33.59 | % |  | — | % |  | 36.02 | % |  | 14.92 | % |  | 15.47 | % |  | 100.00 | %
Rental Expenses: |  |  |  |  |  |  |  |  |  |  |
Office | 315,653 |  |  | — |  |  | 377,992 |  |  | 130,016 |  |  | 142,886 |  |  | 966,547 |
Residential | 3,632 |  |  | — |  |  | — |  |  | — |  |  | 8,972 |  |  | 12,604 |
Hotel | 33,863 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 33,863 |
Total | 353,148 |  |  | — |  |  | 377,992 |  |  | 130,016 |  |  | 151,858 |  |  | 1,013,014 |
% of Grand Totals | 34.86 | % |  | — | % |  | 37.32 | % |  | 12.83 | % |  | 14.99 | % |  | 100.00 | %
Net operating income | $ | 541,005 |  |  | $ | — |  |  | $ | 581,058 |  |  | $ | 267,164 |  |  | $ | 260,087 |  |  | $ | 1,649,314 |
% of Grand Totals | 32.80 | % |  | — | % |  | 35.23 | % |  | 16.20 | % |  | 15.77 | % |  | 100.00 | %
Less: Net operating income attributable to noncontrolling interests in property partnerships | (33,862) |  |  | — |  |  | (143,562) |  |  | 59 |  |  | — |  |  | (177,365) |
Add: Company’s share of net operating income from unconsolidated joint ventures | 2,866 |  |  | 42,750 |  |  | 6,590 |  |  | — |  |  | 27,687 |  |  | 79,893 |
Company’s share of net operating income | $ | 510,009 |  |  | $ | 42,750 |  |  | $ | 444,086 |  |  | $ | 267,223 |  |  | $ | 287,774 |  |  | $ | 1,551,842 |
% of Grand Totals | 32.86 | % |  | 2.75 | % |  | 28.63 | % |  | 17.22 | % |  | 18.54 | % |  | 100.00 | %
_______________ (1)Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8981-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8657-108599 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8721-108599 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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