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Summary Of Significant Accounting Policies
 3 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]  
Summary Of Significant Accounting Policies
2. Summary of Significant Accounting Policies
BXP does not have any other significant assets, liabilities or operations, other than its investment in BPLP, nor does it have employees of its own. BPLP, not BXP, generally executes all significant business relationships other than transactions involving securities of BXP. All majority-owned subsidiaries and joint ventures over which the Company has financial and operating control and variable interest entities (“VIEs”) in which the Company has determined it is the primary beneficiary are included in the consolidated financial statements. All significant
intercompany balances and transactions have been eliminated in consolidation. The Company accounts for all other unconsolidated joint ventures using the equity method of accounting. Accordingly, the Company’s share of the earnings of these joint ventures and companies is included in consolidated net income.
The accompanying interim financial statements are unaudited; however, the financial statements have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information and in conjunction with the rules and regulations of the Securities and Exchange Commission (the “SEC”). Accordingly, they do not include all of the disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting solely of normal recurring matters) necessary for a fair statement of the financial statements for these interim periods have been included. The results of operations for the interim periods are not necessarily indicative of the results to be obtained for other interim periods or for the full fiscal year. The year-end consolidated balance sheet data was derived from audited financial statements, but does not include all disclosure required by GAAP.  These financial statements should be read in conjunction with the Company’s financial statements and notes thereto contained in the Company’s Annual Report in the Company’s Form 10-K for its fiscal year ended December 31, 2023.
The Company bases its estimates on historical experience and on various other assumptions that it considers to be reasonable under the circumstances, including the impact of extraordinary events such as a pandemic, the results of which form the basis for making significant judgments about the carrying values of assets and liabilities, assessments of future collectability, and other areas of the financial statements that are impacted by the use of estimates. Actual results may differ from these estimates under different assumptions or conditions.
Variable Interest Entities (VIEs)
Consolidated VIEs are those for which the Company is considered to be the primary beneficiary of a VIE. The primary beneficiary is the entity that has a controlling financial interest in the VIE, which is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the VIE’s performance and (2) the obligation to absorb losses or the right to receive the returns from the VIE that could potentially be significant to the VIE. The assets of each VIE are only available to satisfy such VIE's respective liabilities. The Company has identified nine entities that are VIEs as of March 31, 2024 and has determined that it is the primary beneficiary for all of these entities as of March 31, 2024.
Consolidated Variable Interest Entities
As of March 31, 2024, BXP has identified nine consolidated VIEs, including BPLP. Excluding BPLP, the consolidated VIEs consisted of (i) the following five in-service properties: 767 Fifth Avenue (the General Motors Building), Times Square Tower, 601 Lexington Avenue, Atlantic Wharf Office Building and 100 Federal Street, (ii) 343 Madison Avenue, which is categorized as land held for future development and (iii) 290 Binney Street and 300 Binney Street which are currently under development / redevelopment.
The Company consolidates these VIEs because it is the primary beneficiary.  The third parties’ interests in these consolidated entities (excluding BPLP’s interest) are reflected as noncontrolling interests in property partnerships in the accompanying consolidated financial statements (See Note 9).
In addition, BXP’s only significant asset is its investment in BPLP and, consequently, substantially all of BXP’s assets and liabilities are the assets and liabilities of BPLP.
Variable Interest Entities Not Consolidated
As of March 31, 2024, the Company does not have any unconsolidated joint ventures that are classified as VIEs.
Fair Value Measurements
The Company follows the authoritative guidance for fair value measurements when valuing its financial instruments for disclosure purposes. The table below presents for March 31, 2024 and December 31, 2023, the financial instruments that are being valued for disclosure purposes as well as the Level at which they are categorized as defined in Accounting Standards Codification (“ASC”) 820 “Fair Value Measurements and Disclosures” (“ASC 820”).
Financial InstrumentLevel
3-Month United States Treasury BillsLevel 1
Investment in securitiesLevel 1
Unsecured senior notes (1)Level 1
Related party note receivableLevel 3
Notes receivableLevel 3
Sales-type lease receivableLevel 3
Mortgage notes payableLevel 3
Unsecured line of creditLevel 3
Unsecured term loanLevel 3
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(1)If trading volume 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.
In addition, the Company’s estimated fair values for these instruments as of the end of the applicable reporting period are not projections of, nor necessarily indicative of, estimated or actual fair values in future reporting periods.
At December 31, 2023, the Company had outstanding three-month United States Treasury Bills with a maturity date of January 30, 2024 that were classified as held to maturity because the Company determined that it had the positive intent and ability to hold to maturity. Because these securities were considered a short-term investment, they are reflected at amortized cost within Cash and Cash Equivalents on the Consolidated Balance Sheets. At December 31, 2023, the amortized cost of these securities was approximately $302.7 million. There were no such securities outstanding at March 31, 2024.
The Company’s investment in non-real estate investments is shown within Prepaid and Other Assets on the Consolidated Balance Sheets and was approximately $5.1 million and $4.6 million at March 31, 2024 and December 31, 2023, respectively. The non-real estate investments utilize net asset value as the practical expedient.
Non-Recurring Fair Value
The following table presents the aggregate carrying value of the Company’s non-recurring fair value financial
instruments and the Company’s corresponding estimate of fair value as of March 31, 2024 and December 31, 2023 (in thousands):
 March 31, 2024December 31, 2023
 Carrying
Amount		Estimated
Fair Value		Carrying
Amount		Estimated
Fair Value
3-Month United States Treasury Bills (1)$— $— $302,746 $302,746 
Related party note receivable, net$88,789 $90,582 $88,779 $90,593 
Note receivable, net2,274 2,249 1,714 1,677 
Sales-type lease receivable, net13,943 13,416 13,704 13,338 
Total$105,006 $106,247 $104,197 $105,608 
Mortgage notes payable, net$4,368,367 $3,935,382 $4,166,379 $3,705,513 
Unsecured senior notes, net9,794,527 8,979,934 10,491,617 9,697,393 
Unsecured line of credit— — — — 
Unsecured term loan, net1,199,430 1,198,951 1,198,301 1,196,945 
Total$15,362,324 $14,114,267 $15,856,297 $14,599,851 
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(1) Per the guidance in ASC 326 “Financial Instruments — Credit Losses” (“ASC 326”), the Company concluded that the risk of nonpayment is nonexistent because the U.S. Government has a long history with no credit losses and therefore, no credit loss allowance was recorded.

At March 31, 2024, the Company evaluated the expected hold period for a portion of its Shady Grove property located in Rockville, Maryland. Based on a shorter-than-expected hold period, the Company reduced the carrying value of a portion of the property that the Company anticipates selling to a third party developer to its estimated fair value at March 31, 2024. As a result, each of BXP and BPLP recognized an impairment loss of approximately $13.6 million. The Company’s estimated fair value utilized Level 3 inputs and was based on a pending offer from a third party.
Recurring Fair Value
Derivatives
In addition to the financial instruments noted above, the Company uses interest rate swap agreements to manage its interest rate risk (See Note 7). The valuation of these instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. To comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. Although the Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. The Company assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and determined that the credit valuation adjustments were not significant to the overall valuation of its derivatives. As a result, the Company has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.
The following table presents the aggregate fair value of the Company’s interest rate swaps as of March 31, 2024 and December 31, 2023 (in thousands):
Fair valueMarch 31, 2024December 31, 2023
Interest rate swaps$12,298 $1,976 
Investments
The Company accounts for investments in equity securities at fair value, with gains or losses resulting from changes in fair value recognized currently in earnings. The Company maintains deferred compensation plans that are designed to allow officers and non-employee directors of BXP to defer a portion of the officer’s current income or the non-employee director’s current compensation on a pre-tax basis and receive a tax-deferred return on these deferrals based on the performance of specific investments selected by the officer or non-employee director. The Company’s obligation under the plans is that of an unsecured promise to pay the deferred compensation to the plan participants in the future. At March 31, 2024 and December 31, 2023, the Company had maintained approximately $37.0 million and $36.1 million, respectively, in separate accounts, which are not restricted as to their use. The Company recognized gains of approximately $2.3 million and $1.7 million on its investments in the accounts associated with the Company’s deferred compensation plans during the three months ended March 31, 2024 and March 31, 2023, respectively primarily due to the observable change in fair value.