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Consolidated Balance Sheets - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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ASSETS |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,581,689 and $6,497,031 at June 30, 2020 and December 31, 2019, respectively) | $ 22,575,903 | $ 22,502,976
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2020 and December 31, 2019, respectively) | 237,394 | 237,394
Right of use assets - operating leases | 147,512 | 148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,112,769) and $(1,058,495) at June 30, 2020 and December 31, 2019, respectively) | (5,292,389) | (5,266,798)
Total real estate | 17,668,420 | 17,622,212
Cash and cash equivalents (amounts related to VIEs of $300,552 and $280,033 at June 30, 2020 and December 31, 2019, respectively) | 1,691,047 | 644,950
Cash held in escrows | 300,608 | 46,936
Investments in securities | 32,848 | 36,747
Tenant and other receivables, net (amounts related to VIEs of $11,989 and $28,918 at June 30, 2020 and December 31, 2019, respectively) | 82,545 | 112,807
Related party note receivable, net | 78,520 | 80,000
Notes receivable, net | 25,480 | 15,920
Accrued rental income, net (amounts related to VIEs of $304,929 and $298,318 at June 30, 2020 and December 31, 2019, respectively) | 1,069,004 | 1,038,788
Deferred charges, net (amounts related to VIEs of $190,708 and $214,769 at June 30, 2020 and December 31, 2019, respectively) | 655,813 | 689,213
Prepaid expenses and other assets (amounts related to VIEs of $18,741 and $20,931 at June 30, 2020 and December 31, 2019, respectively) | 56,768 | 41,685
Investments in unconsolidated joint ventures | 1,339,724 | 955,647
Total assets | 23,000,777 | 21,284,905
Liabilities: |  |
Mortgage notes payable, net (amounts related to VIEs of $2,913,287 and $2,918,806 at June 30, 2020 and December 31, 2019, respectively) | 2,915,852 | 2,922,408
Unsecured senior notes, net | 9,633,577 | 8,390,459
Unsecured line of credit | 0 | 0
Unsecured term loan, net | 499,150 | 498,939
Lease liabilities - finance leases (amounts related to VIEs of $20,227 and $20,189 at June 30, 2020 and December 31, 2019, respectively) | 230,146 | 224,042
Lease liabilities - operating leases | 200,979 | 200,180
Accounts payable and accrued expenses (amounts related to VIEs of $25,685 and $45,777 at June 30, 2020 and December 31, 2019, respectively) | 328,292 | 377,553
Dividends and distributions payable | 171,077 | 170,713
Accrued interest payable | 95,274 | 90,016
Other liabilities (amounts related to VIEs of $132,460 and $140,110 at June 30, 2020 and December 31, 2019, respectively) | 373,281 | 387,994
Total liabilities | 14,447,628 | 13,262,304
Commitments and contingencies | 0 | 0
Redeemable deferred stock units— 66,424 and 60,676 units outstanding at redemption value at June 30, 2020 and December 31, 2019, respectively | 6,003 | 8,365
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; |  |
5.25% Series B cumulative redeemable preferred stock / units, liquidation preference $2,500 per share / unit, 80,000 shares / units issued and outstanding at June 30, 2020 and December 31, 2019, respectively | 200,000 | 200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 155,701,186 and 154,869,198 issued and 155,622,286 and 154,790,298 outstanding at June 30, 2020 and December 31, 2019, respectively | 1,556 | 1,548
Additional paid-in capital | 6,340,665 | 6,294,719
Dividends in excess of earnings | (302,511) | (760,523)
Treasury common stock at cost, 78,900 shares at June 30, 2020 and December 31, 2019 | (2,722) | (2,722)
Accumulated other comprehensive loss | (54,921) | (48,335)
Total stockholders' equity attributable to Boston Properties, Inc. | 6,182,067 | 5,684,687
Noncontrolling interests: |  |
Common units of the Operating Partnership | 640,491 | 600,860
Property partnerships | 1,724,588 | 1,728,689
Total equity / capital | 8,547,146 | 8,014,236
Total liabilities and equity / capital | $ 23,000,777 | $ 21,284,905
Excess stock, par value | $ 0.01 | $ 0.01
Excess stock, shares authorized | 150,000,000 | 150,000,000
Excess stock, shares issued | 0 | 0
Excess stock, shares outstanding | 0 | 0
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 50,000,000 | 50,000,000
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Common stock, shares authorized | 250,000,000 | 250,000,000
Treasury common stock at cost, shares | 78,900 | 78,900
Common stock, shares issued | 155,701,186 | 154,869,198
Common Stock, Shares, Outstanding | 155,622,286 | 154,790,298
General Partners' Capital Account, Units Outstanding (in units) | 1,730,919 |
Limited Partners' Capital Account, Units Outstanding (in units) | 153,891,367 |
Reddemable deferred stock units, units | 66,424 | 60,676
Variable Interest Entity, Primary Beneficiary [Member] |  |
ASSETS |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,581,689 and $6,497,031 at June 30, 2020 and December 31, 2019, respectively) | $ 6,581,689 | $ 6,497,031
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2020 and December 31, 2019, respectively) | 21,000 | 21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,112,769) and $(1,058,495) at June 30, 2020 and December 31, 2019, respectively) | (1,112,769) | (1,058,495)
Cash and cash equivalents (amounts related to VIEs of $300,552 and $280,033 at June 30, 2020 and December 31, 2019, respectively) | 300,552 | 280,033
Tenant and other receivables, net (amounts related to VIEs of $11,989 and $28,918 at June 30, 2020 and December 31, 2019, respectively) | 11,989 | 28,918
Accrued rental income, net (amounts related to VIEs of $304,929 and $298,318 at June 30, 2020 and December 31, 2019, respectively) | 304,929 | 298,318
Deferred charges, net (amounts related to VIEs of $190,708 and $214,769 at June 30, 2020 and December 31, 2019, respectively) | 190,708 | 214,769
Prepaid expenses and other assets (amounts related to VIEs of $18,741 and $20,931 at June 30, 2020 and December 31, 2019, respectively) | 18,741 | 20,931
Liabilities: |  |
Mortgage notes payable, net (amounts related to VIEs of $2,913,287 and $2,918,806 at June 30, 2020 and December 31, 2019, respectively) | 2,913,287 | 2,918,806
Lease liabilities - finance leases (amounts related to VIEs of $20,227 and $20,189 at June 30, 2020 and December 31, 2019, respectively) | 20,227 | 20,189
Accounts payable and accrued expenses (amounts related to VIEs of $25,685 and $45,777 at June 30, 2020 and December 31, 2019, respectively) | 25,685 | 45,777
Other liabilities (amounts related to VIEs of $132,460 and $140,110 at June 30, 2020 and December 31, 2019, respectively) | $ 132,460 | $ 140,110
Series B Cumulative Redeemable Preferred Stock / Unit [Member] |  |
Noncontrolling interests: |  |
Preferred stock / units, shares / units outstanding (in shares / units) | 80,000 | 80,000
Preferred stock / units, shares / units issued (in shares / units) | 80,000 | 80,000
Series B Dividend Rate Percentage | 5.25% | 5.25%
Series B Liquidation Preference Per Share/ Unit | $ 2,500.00 | $ 2,500
Preferred stock, par value | $ 0.01 | $ 0.01
Preferred stock, shares authorized | 92,000 | 92,000
Boston Properties Limited Partnership |  |
ASSETS |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,581,689 and $6,497,031 at June 30, 2020 and December 31, 2019, respectively) | $ 22,199,094 | $ 22,107,755
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2020 and December 31, 2019, respectively) | 237,394 | 237,394
Right of use assets - operating leases | 147,512 | 148,640
Less: accumulated depreciation (amounts related to VIEs of $(1,112,769) and $(1,058,495) at June 30, 2020 and December 31, 2019, respectively) | (5,190,360) | (5,162,908)
Total real estate | 17,393,640 | 17,330,881
Cash and cash equivalents (amounts related to VIEs of $300,552 and $280,033 at June 30, 2020 and December 31, 2019, respectively) | 1,691,047 | 644,950
Cash held in escrows | 300,608 | 46,936
Investments in securities | 32,848 | 36,747
Tenant and other receivables, net (amounts related to VIEs of $11,989 and $28,918 at June 30, 2020 and December 31, 2019, respectively) | 82,545 | 112,807
Related party note receivable, net | 78,520 | 80,000
Notes receivable, net | 25,480 | 15,920
Accrued rental income, net (amounts related to VIEs of $304,929 and $298,318 at June 30, 2020 and December 31, 2019, respectively) | 1,069,004 | 1,038,788
Deferred charges, net (amounts related to VIEs of $190,708 and $214,769 at June 30, 2020 and December 31, 2019, respectively) | 655,813 | 689,213
Prepaid expenses and other assets (amounts related to VIEs of $18,741 and $20,931 at June 30, 2020 and December 31, 2019, respectively) | 56,768 | 41,685
Investments in unconsolidated joint ventures | 1,339,724 | 955,647
Total assets | 22,725,997 | 20,993,574
Liabilities: |  |
Mortgage notes payable, net (amounts related to VIEs of $2,913,287 and $2,918,806 at June 30, 2020 and December 31, 2019, respectively) | 2,915,852 | 2,922,408
Unsecured senior notes, net | 9,633,577 | 8,390,459
Unsecured line of credit | 0 | 0
Unsecured term loan, net | 499,150 | 498,939
Lease liabilities - finance leases (amounts related to VIEs of $20,227 and $20,189 at June 30, 2020 and December 31, 2019, respectively) | 230,146 | 224,042
Lease liabilities - operating leases | 200,979 | 200,180
Accounts payable and accrued expenses (amounts related to VIEs of $25,685 and $45,777 at June 30, 2020 and December 31, 2019, respectively) | 328,292 | 377,553
Dividends and distributions payable | 171,077 | 170,713
Accrued interest payable | 95,274 | 90,016
Other liabilities (amounts related to VIEs of $132,460 and $140,110 at June 30, 2020 and December 31, 2019, respectively) | 373,281 | 387,994
Total liabilities | 14,447,628 | 13,262,304
Commitments and contingencies | 0 | 0
Redeemable deferred stock units— 66,424 and 60,676 units outstanding at redemption value at June 30, 2020 and December 31, 2019, respectively | 6,003 | 8,365
Redeemable partnership units— 16,123,912 and 16,764,466 common units and 1,345,723 and 1,143,215 long term incentive units outstanding at redemption value at June 30, 2020 and December 31, 2019, respectively | 1,581,010 | 2,468,753
Preferred stock, $0.01 par value, 50,000,000 shares authorized; |  |
5.25% Series B cumulative redeemable preferred stock / units, liquidation preference $2,500 per share / unit, 80,000 shares / units issued and outstanding at June 30, 2020 and December 31, 2019, respectively | 193,623 | 193,623
Boston Properties Limited Partnership partners’ capital— 1,730,919 and 1,726,980 general partner units and 153,891,367 and 153,063,318 limited partner units outstanding at June 30, 2020 and December 31, 2019, respectively | 4,828,066 | 3,380,175
Accumulated other comprehensive loss | (54,921) | (48,335)
Total partners’ capital | 4,966,768 | 3,525,463
Noncontrolling interests in property partnerships | 1,724,588 | 1,728,689
Noncontrolling interests: |  |
Total equity / capital | 6,691,356 | 5,254,152
Total liabilities and equity / capital | $ 22,725,997 | $ 20,993,574
General Partners' Capital Account, Units Outstanding (in units) | 1,730,919 | 1,726,980
Limited Partners' Capital Account, Units Outstanding (in units) | 153,891,367 | 153,063,318
Reddemable deferred stock units, units | 66,424 | 60,676
NonControlling Interest Redeemable Partnership Units Common Units Shares Outstanding | 16,123,912 | 16,764,466
NonControlling Interest Redeemable Partnership Units Common Units Long Term Incentive Units At Redemption Value Shares Outstanding | 1,345,723 | 1,143,215
Boston Properties Limited Partnership | Variable Interest Entity, Primary Beneficiary [Member] |  |
ASSETS |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $6,581,689 and $6,497,031 at June 30, 2020 and December 31, 2019, respectively) | $ 6,581,689 | $ 6,497,031
Right of use assets - finance leases (amounts related to VIEs of $21,000 and $21,000 at June 30, 2020 and December 31, 2019, respectively) | 21,000 | 21,000
Less: accumulated depreciation (amounts related to VIEs of $(1,112,769) and $(1,058,495) at June 30, 2020 and December 31, 2019, respectively) | (1,112,769) | (1,058,495)
Cash and cash equivalents (amounts related to VIEs of $300,552 and $280,033 at June 30, 2020 and December 31, 2019, respectively) | 300,552 | 280,033
Tenant and other receivables, net (amounts related to VIEs of $11,989 and $28,918 at June 30, 2020 and December 31, 2019, respectively) | 11,989 | 28,918
Accrued rental income, net (amounts related to VIEs of $304,929 and $298,318 at June 30, 2020 and December 31, 2019, respectively) | 304,929 | 298,318
Deferred charges, net (amounts related to VIEs of $190,708 and $214,769 at June 30, 2020 and December 31, 2019, respectively) | 190,708 | 214,769
Prepaid expenses and other assets (amounts related to VIEs of $18,741 and $20,931 at June 30, 2020 and December 31, 2019, respectively) | 18,741 | 20,931
Liabilities: |  |
Mortgage notes payable, net (amounts related to VIEs of $2,913,287 and $2,918,806 at June 30, 2020 and December 31, 2019, respectively) | 2,913,287 | 2,918,806
Lease liabilities - finance leases (amounts related to VIEs of $20,227 and $20,189 at June 30, 2020 and December 31, 2019, respectively) | 20,227 | 20,189
Accounts payable and accrued expenses (amounts related to VIEs of $25,685 and $45,777 at June 30, 2020 and December 31, 2019, respectively) | 25,685 | 45,777
Other liabilities (amounts related to VIEs of $132,460 and $140,110 at June 30, 2020 and December 31, 2019, respectively) | $ 132,460 | $ 140,110
Boston Properties Limited Partnership | Series B Cumulative Redeemable Preferred Stock / Unit [Member] |  |
Noncontrolling interests: |  |
Preferred stock / units, shares / units outstanding (in shares / units) | 80,000 | 80,000
Preferred stock / units, shares / units issued (in shares / units) | 80,000 | 80,000
Series B Dividend Rate Percentage | 5.25% | 5.25%
Series B Liquidation Preference Per Share/ Unit | $ 2,500 | $ 2,500

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- Definition Maximum number of excess stock shares permitted to be issued. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(23)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(25)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(32)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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- Definition As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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