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Consolidated Balance Sheets - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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ASSETS |  |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,054,075 and $6,789,029 at December 31, 2023 and December 31, 2022, respectively) |  | $ 26,749,209 | $ 25,389,663
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2023 and December 31, 2022, respectively) |  | 401,680 | 237,510
Right of use assets - operating leases (amounts related to VIEs of $158,885 and $0 at December 31, 2023 and December 31, 2022, respectively) | [1] | 324,298 | 167,351
Less: accumulated depreciation (amounts related to VIEs of $(1,501,483) and $(1,381,401) at December 31, 2023 and December 31, 2022, respectively) |  | (6,881,728) | (6,298,082)
Total real estate |  | 20,593,459 | 19,496,442
Cash and cash equivalents (amounts related to VIEs of $245,317 and $259,658 at December 31, 2023 and December 31, 2022, respectively) |  | 1,531,477 | 690,333
Cash held in escrows (amounts related to VIEs of $22,160 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 81,090 | 46,479
Investments in securities |  | 36,337 | 32,277
Tenant and other receivables, net (amounts related to VIEs of $27,987 and $16,521 at December 31, 2023 and December 31, 2022, respectively) |  | 122,407 | 81,389
Note receivable, net |  | 1,714 | 0
Sales-type lease receivable, net |  | 13,704 | 12,811
Accrued rental income, net (amounts related to VIEs of $401,159 and $367,138 at December 31, 2023 and December 31, 2022, respectively) |  | 1,355,212 | 1,276,580
Deferred charges, net (amounts related to VIEs of $175,383 and $176,597 at December 31, 2023 and December 31, 2022, respectively) |  | 760,421 | 733,282
Prepaid expenses and other assets (amounts related to VIEs of $11,824 and $11,647 at December 31, 2023 and December 31, 2022, respectively) |  | 64,230 | 43,589
Investments in unconsolidated joint ventures |  | 1,377,319 | 1,715,911
Total assets |  | 26,026,149 | 24,207,669
Liabilities: |  |  |
Mortgage notes payable, net (amounts related to VIEs of $3,277,185 and $3,272,368 at December 31, 2023 and December 31, 2022, respectively) |  | 4,166,379 | 3,272,368
Unsecured senior notes, net |  | 10,491,617 | 10,237,968
Unsecured line of credit |  | 0 | 0
Unsecured term loan, net |  | 1,198,301 | 730,000
Lease liabilities - finance leases (amounts related to VIEs of $20,794 and $20,604 at December 31, 2023 and December 31, 2022, respectively) |  | 417,961 | 249,335
Lease liabilities - operating leases (amounts related to VIEs of $145,826 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 350,391 | 204,686
Accounts payable and accrued expenses (amounts related to VIEs of $59,667 and $29,466 at December 31, 2023 and December 31, 2022, respectively) |  | 458,329 | 417,545
Dividends and distributions payable |  | 171,176 | 170,643
Accrued interest payable |  | 133,684 | 103,774
Other liabilities (amounts related to VIEs of $115,275 and $114,232 at December 31, 2023 and December 31, 2022, respectively) |  | 445,947 | 450,918
Total liabilities |  | 17,833,785 | 15,837,237
Redeemable deferred stock units— 119,471 and 97,853 units outstanding at redemption value at December 31, 2023 and December 31, 2022, respectively |  | $ 8,383 | $ 6,613
Excess stock, shares outstanding |  | 0 | 0
Excess stock, shares issued |  | 0 | 0
Preferred stock / units, shares / units issued (in shares / units) |  | 0 | 0
Preferred stock / units, shares / units outstanding (in shares / units) |  | 0 | 0
Equity / Capital: |  |  |
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding |  | $ 0 | $ 0
Preferred stock, $0.01 par value, 50,000,000 shares authorized, none issued or outstanding |  | 0 | 0
Common stock, $0.01 par value, 250,000,000 shares authorized, 157,019,766 and 156,836,767 issued and 156,940,866 and 156,757,867 outstanding at December 31, 2023 and December 31, 2022, respectively |  | 1,569 | 1,568
Additional paid-in capital |  | 6,715,149 | 6,539,147
Dividends in excess of earnings |  | $ (816,152) | $ (391,356)
Treasury common stock at cost, shares |  | 78,900 | 78,900
Treasury common stock at cost, 78,900 shares at December 31, 2023 and December 31, 2022 |  | $ (2,722) | $ (2,722)
Accumulated other comprehensive loss |  | (21,147) | (13,718)
Total stockholders' equity attributable to Boston Properties, Inc. |  | 5,876,697 | 6,132,919
Noncontrolling interests: |  |  |
Common units of the Operating Partnership |  | 666,580 | 683,583
Property partnerships |  | 1,640,704 | 1,547,317
Total equity / capital |  | 8,183,981 | 8,363,819
Total liabilities and equity / capital |  | 26,026,149 | 24,207,669
Related Party |  |  |
ASSETS |  |  |
Related party note receivable, net |  | 88,779 | 78,576
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
ASSETS |  |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,054,075 and $6,789,029 at December 31, 2023 and December 31, 2022, respectively) |  | 7,054,075 | 6,789,029
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2023 and December 31, 2022, respectively) |  | 21,000 | 21,000
Right of use assets - operating leases (amounts related to VIEs of $158,885 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 158,885 | 0
Less: accumulated depreciation (amounts related to VIEs of $(1,501,483) and $(1,381,401) at December 31, 2023 and December 31, 2022, respectively) |  | (1,501,483) | (1,381,401)
Cash and cash equivalents (amounts related to VIEs of $245,317 and $259,658 at December 31, 2023 and December 31, 2022, respectively) |  | 245,317 | 259,658
Cash held in escrows (amounts related to VIEs of $22,160 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 22,160 | 0
Tenant and other receivables, net (amounts related to VIEs of $27,987 and $16,521 at December 31, 2023 and December 31, 2022, respectively) |  | 27,987 | 16,521
Accrued rental income, net (amounts related to VIEs of $401,159 and $367,138 at December 31, 2023 and December 31, 2022, respectively) |  | 401,159 | 367,138
Deferred charges, net (amounts related to VIEs of $175,383 and $176,597 at December 31, 2023 and December 31, 2022, respectively) |  | 175,383 | 176,597
Prepaid expenses and other assets (amounts related to VIEs of $11,824 and $11,647 at December 31, 2023 and December 31, 2022, respectively) |  | 11,824 | 11,647
Liabilities: |  |  |
Mortgage notes payable, net (amounts related to VIEs of $3,277,185 and $3,272,368 at December 31, 2023 and December 31, 2022, respectively) |  | 3,277,185 | 3,272,368
Lease liabilities - finance leases (amounts related to VIEs of $20,794 and $20,604 at December 31, 2023 and December 31, 2022, respectively) |  | 20,794 | 20,604
Lease liabilities - operating leases (amounts related to VIEs of $145,826 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 145,826 | 0
Accounts payable and accrued expenses (amounts related to VIEs of $59,667 and $29,466 at December 31, 2023 and December 31, 2022, respectively) |  | 59,667 | 29,466
Other liabilities (amounts related to VIEs of $115,275 and $114,232 at December 31, 2023 and December 31, 2022, respectively) |  | 115,275 | 114,232
Boston Properties Limited Partnership |  |  |
ASSETS |  |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,054,075 and $6,789,029 at December 31, 2023 and December 31, 2022, respectively) |  | 26,382,944 | 25,022,149
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2023 and December 31, 2022, respectively) |  | 401,680 | 237,510
Right of use assets - operating leases (amounts related to VIEs of $158,885 and $0 at December 31, 2023 and December 31, 2022, respectively) | [1] | 324,298 | 167,351
Less: accumulated depreciation (amounts related to VIEs of $(1,501,483) and $(1,381,401) at December 31, 2023 and December 31, 2022, respectively) |  | (6,758,361) | (6,180,474)
Total real estate |  | 20,350,561 | 19,246,536
Cash and cash equivalents (amounts related to VIEs of $245,317 and $259,658 at December 31, 2023 and December 31, 2022, respectively) |  | 1,531,477 | 690,333
Cash held in escrows (amounts related to VIEs of $22,160 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 81,090 | 46,479
Investments in securities |  | 36,337 | 32,277
Tenant and other receivables, net (amounts related to VIEs of $27,987 and $16,521 at December 31, 2023 and December 31, 2022, respectively) |  | 122,407 | 81,389
Note receivable, net |  | 1,714 | 0
Sales-type lease receivable, net |  | 13,704 | 12,811
Accrued rental income, net (amounts related to VIEs of $401,159 and $367,138 at December 31, 2023 and December 31, 2022, respectively) |  | 1,355,212 | 1,276,580
Deferred charges, net (amounts related to VIEs of $175,383 and $176,597 at December 31, 2023 and December 31, 2022, respectively) |  | 760,421 | 733,282
Prepaid expenses and other assets (amounts related to VIEs of $11,824 and $11,647 at December 31, 2023 and December 31, 2022, respectively) |  | 64,230 | 43,589
Investments in unconsolidated joint ventures |  | 1,377,319 | 1,715,911
Total assets |  | 25,783,251 | 23,957,763
Liabilities: |  |  |
Mortgage notes payable, net (amounts related to VIEs of $3,277,185 and $3,272,368 at December 31, 2023 and December 31, 2022, respectively) |  | 4,166,379 | 3,272,368
Unsecured senior notes, net |  | 10,491,617 | 10,237,968
Unsecured line of credit |  | 0 | 0
Unsecured term loan, net |  | 1,198,301 | 730,000
Lease liabilities - finance leases (amounts related to VIEs of $20,794 and $20,604 at December 31, 2023 and December 31, 2022, respectively) |  | 417,961 | 249,335
Lease liabilities - operating leases (amounts related to VIEs of $145,826 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 350,391 | 204,686
Accounts payable and accrued expenses (amounts related to VIEs of $59,667 and $29,466 at December 31, 2023 and December 31, 2022, respectively) |  | 458,329 | 417,545
Dividends and distributions payable |  | 171,176 | 170,643
Accrued interest payable |  | 133,684 | 103,774
Other liabilities (amounts related to VIEs of $115,275 and $114,232 at December 31, 2023 and December 31, 2022, respectively) |  | 445,947 | 450,918
Total liabilities |  | 17,833,785 | 15,837,237
Redeemable deferred stock units— 119,471 and 97,853 units outstanding at redemption value at December 31, 2023 and December 31, 2022, respectively |  | 8,383 | 6,613
Noncontrolling interest: |  |  |
Redeemable partnership units— 16,508,277 and 16,531,172 common units and 2,065,861 and 1,679,175 long term incentive units outstanding at redemption value at December 31, 2023 and December 31, 2022, respectively |  | 1,347,575 | 1,280,886
Equity / Capital: |  |  |
Boston Properties Limited Partnership partners’ capital— 1,755,150 and 1,749,682 general partner units and 155,185,716 and 155,008,185 limited partner units outstanding at December 31, 2023 and December 31, 2022, respectively |  | 4,973,951 | 5,299,428
Accumulated other comprehensive loss |  | (21,147) | (13,718)
Total partners’ capital |  | 4,952,804 | 5,285,710
Noncontrolling interests in property partnerships |  | 1,640,704 | 1,547,317
Noncontrolling interests: |  |  |
Total equity / capital |  | 6,593,508 | 6,833,027
Total liabilities and equity / capital |  | 25,783,251 | 23,957,763
Boston Properties Limited Partnership | Related Party |  |  |
ASSETS |  |  |
Related party note receivable, net |  | 88,779 | 78,576
Boston Properties Limited Partnership | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
ASSETS |  |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,054,075 and $6,789,029 at December 31, 2023 and December 31, 2022, respectively) |  | 7,054,075 | 6,789,029
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at December 31, 2023 and December 31, 2022, respectively) |  | 21,000 | 21,000
Right of use assets - operating leases (amounts related to VIEs of $158,885 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 158,885 | 0
Less: accumulated depreciation (amounts related to VIEs of $(1,501,483) and $(1,381,401) at December 31, 2023 and December 31, 2022, respectively) |  | (1,501,483) | (1,381,401)
Cash and cash equivalents (amounts related to VIEs of $245,317 and $259,658 at December 31, 2023 and December 31, 2022, respectively) |  | 245,317 | 259,658
Cash held in escrows (amounts related to VIEs of $22,160 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 22,160 | 0
Tenant and other receivables, net (amounts related to VIEs of $27,987 and $16,521 at December 31, 2023 and December 31, 2022, respectively) |  | 27,987 | 16,521
Accrued rental income, net (amounts related to VIEs of $401,159 and $367,138 at December 31, 2023 and December 31, 2022, respectively) |  | 401,159 | 367,138
Deferred charges, net (amounts related to VIEs of $175,383 and $176,597 at December 31, 2023 and December 31, 2022, respectively) |  | 175,383 | 176,597
Prepaid expenses and other assets (amounts related to VIEs of $11,824 and $11,647 at December 31, 2023 and December 31, 2022, respectively) |  | 11,824 | 11,647
Liabilities: |  |  |
Mortgage notes payable, net (amounts related to VIEs of $3,277,185 and $3,272,368 at December 31, 2023 and December 31, 2022, respectively) |  | 3,277,185 | 3,272,368
Lease liabilities - finance leases (amounts related to VIEs of $20,794 and $20,604 at December 31, 2023 and December 31, 2022, respectively) |  | 20,794 | 20,604
Lease liabilities - operating leases (amounts related to VIEs of $145,826 and $0 at December 31, 2023 and December 31, 2022, respectively) |  | 145,826 | 0
Accounts payable and accrued expenses (amounts related to VIEs of $59,667 and $29,466 at December 31, 2023 and December 31, 2022, respectively) |  | 59,667 | 29,466
Other liabilities (amounts related to VIEs of $115,275 and $114,232 at December 31, 2023 and December 31, 2022, respectively) |  | $ 115,275 | $ 114,232
[1] | See Note 4.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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