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Consolidated Balance Sheets - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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ASSETS |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,426,998 and $7,172,718 at September 30, 2018 and December 31, 2017, respectively) | $ 21,687,639 | $ 21,096,642
Less: accumulated depreciation (amounts related to VIEs of $(942,678) and $(854,172) at September 30, 2018 and December 31, 2017, respectively) | (4,838,496) | (4,589,634)
Total real estate | 16,849,143 | 16,507,008
Cash and cash equivalents (amounts related to VIEs of $284,053 and $304,955 at September 30, 2018 and December 31, 2017, respectively) | 322,502 | 434,767
Cash held in escrows (amounts related to VIEs of $6,118 and $6,135 at September 30, 2018 and December 31, 2017, respectively) | 101,282 | 70,602
Investments in securities | 31,376 | 29,161
Tenant and other receivables (amounts related to VIEs of $42,193 and $27,057 at September 30, 2018 and December 31, 2017, respectively) | 98,502 | 92,186
Related party note receivable | 80,000 | 0
Accrued rental income (amounts related to VIEs of $269,794 and $242,589 at September 30, 2018 and December 31, 2017, respectively) | 926,274 | 861,575
Deferred charges, net (amounts related to VIEs of $261,951 and $281,678 at September 30, 2018 and December 31, 2017, respectively) | 669,545 | 679,038
Prepaid expenses and other assets (amounts related to VIEs of $62,325 and $33,666 at September 30, 2018 and December 31, 2017, respectively) | 133,443 | 77,971
Investments in unconsolidated joint ventures | 925,431 | 619,925
Total assets | 20,137,498 | 19,372,233
Liabilities: |  |
Mortgage notes payable, net (amounts related to VIEs of $2,931,852 and $2,939,183 at September 30, 2018 and December 31, 2017, respectively) | 2,967,548 | 2,979,281
Unsecured senior notes, net | 7,253,786 | 7,247,330
Unsecured line of credit | 170,000 | 45,000
Unsecured term loan, net | 498,368 | 0
Accounts payable and accrued expenses (amounts related to VIEs of $78,893 and $106,683 at September 30, 2018 and December 31, 2017, respectively) | 315,462 | 331,500
Dividends and distributions payable | 165,118 | 139,040
Accrued interest payable (amounts related to VIEs of $6,659 and $6,907 at September 30, 2018 and December 31, 2017, respectively) | 92,809 | 83,646
Other liabilities (amounts related to VIEs of $200,306 and $164,806 at September 30, 2018 and December 31, 2017, respectively) | 468,433 | 443,980
Total liabilities | 11,931,524 | 11,269,777
Commitments and contingencies | 0 | 0
Equity / Capital: |  |
Excess stock, $0.01 par value, 150,000,000 shares authorized, none issued or outstanding | 0 | 0
Preferred stock, $.01 par value, 50,000,000 shares authorized |  |
5.25% Series B cumulative redeemable preferred stock/unit, liquidation preference $2,500 per share/unit, 92,000 shares authorized, 80,000 shares/units issued and outstanding at September 30, 2018 and December 31, 2017 | 200,000 | 200,000
Common stock, $0.01 par value, 250,000,000 shares authorized, 154,519,139 and 154,404,186 issued and 154,440,239 and 154,325,286 outstanding at September 30, 2018 and December 31, 2017, respectively | 1,544 | 1,543
Additional paid-in capital | 6,400,193 | 6,377,908
Dividends in excess of earnings | (677,312) | (712,343)
Treasury common stock at cost, 78,900 shares at September 30, 2018 and December 31, 2017 | (2,722) | (2,722)
Accumulated other comprehensive loss | (45,137) | (50,429)
Total stockholders’ equity attributable to Boston Properties, Inc. | 5,876,566 | 5,813,957
Noncontrolling interests: |  |
Common units of Boston Properties Limited Partnership | 618,380 | 604,739
Property partnerships | 1,711,028 | 1,683,760
Total equity / capital | 8,205,974 | 8,102,456
Total liabilities and equity / capital | 20,137,498 | 19,372,233
Boston Properties Limited Partnership |  |
ASSETS |  |
Real estate, at cost (amounts related to variable interest entities (“VIEs”) of $7,426,998 and $7,172,718 at September 30, 2018 and December 31, 2017, respectively) | 21,281,726 | 20,685,164
Less: accumulated depreciation (amounts related to VIEs of $(942,678) and $(854,172) at September 30, 2018 and December 31, 2017, respectively) | (4,741,280) | (4,496,959)
Total real estate | 16,540,446 | 16,188,205
Cash and cash equivalents (amounts related to VIEs of $284,053 and $304,955 at September 30, 2018 and December 31, 2017, respectively) | 322,502 | 434,767
Cash held in escrows (amounts related to VIEs of $6,118 and $6,135 at September 30, 2018 and December 31, 2017, respectively) | 101,282 | 70,602
Investments in securities | 31,376 | 29,161
Tenant and other receivables (amounts related to VIEs of $42,193 and $27,057 at September 30, 2018 and December 31, 2017, respectively) | 98,502 | 92,186
Related party note receivable | 80,000 | 0
Accrued rental income (amounts related to VIEs of $269,794 and $242,589 at September 30, 2018 and December 31, 2017, respectively) | 926,274 | 861,575
Deferred charges, net (amounts related to VIEs of $261,951 and $281,678 at September 30, 2018 and December 31, 2017, respectively) | 669,545 | 679,038
Prepaid expenses and other assets (amounts related to VIEs of $62,325 and $33,666 at September 30, 2018 and December 31, 2017, respectively) | 133,443 | 77,971
Investments in unconsolidated joint ventures | 925,431 | 619,925
Total assets | 19,828,801 | 19,053,430
Liabilities: |  |
Mortgage notes payable, net (amounts related to VIEs of $2,931,852 and $2,939,183 at September 30, 2018 and December 31, 2017, respectively) | 2,967,548 | 2,979,281
Unsecured senior notes, net | 7,253,786 | 7,247,330
Unsecured line of credit | 170,000 | 45,000
Unsecured term loan, net | 498,368 | 0
Accounts payable and accrued expenses (amounts related to VIEs of $78,893 and $106,683 at September 30, 2018 and December 31, 2017, respectively) | 315,462 | 331,500
Dividends and distributions payable | 165,118 | 139,040
Accrued interest payable (amounts related to VIEs of $6,659 and $6,907 at September 30, 2018 and December 31, 2017, respectively) | 92,809 | 83,646
Other liabilities (amounts related to VIEs of $200,306 and $164,806 at September 30, 2018 and December 31, 2017, respectively) | 468,433 | 443,980
Total liabilities | 11,931,524 | 11,269,777
Commitments and contingencies | 0 | 0
Noncontrolling interest: |  |
Redeemable partnership units—16,804,929 and 16,810,378 common units and 992,321 and 818,343 long term incentive units outstanding at redemption value at September 30, 2018 and December 31, 2017, respectively | 2,190,664 | 2,292,263
Preferred stock, $.01 par value, 50,000,000 shares authorized |  |
5.25% Series B cumulative redeemable preferred stock/unit, liquidation preference $2,500 per share/unit, 92,000 shares authorized, 80,000 shares/units issued and outstanding at September 30, 2018 and December 31, 2017 | 193,623 | 193,623
Noncontrolling interests: |  |
Boston Properties Limited Partnership partners’ capital—1,722,375 and 1,719,540 general partner units and 152,717,864 and 152,605,746 limited partner units outstanding at September 30, 2018 and December 31, 2017, respectively | 3,801,962 | 3,614,007
Noncontrolling interests in property partnerships | 1,711,028 | 1,683,760
Total equity / capital | 5,706,613 | 5,491,390
Total liabilities and equity / capital | $ 19,828,801 | $ 19,053,430

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Carrying amount of the equity interests owned by noncontrolling partners of a limited partnership included in the entity's consolidated financial statements. + References No definition available. + Details
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- Definition For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.3) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The amount of ownership interest of different classes of partners in limited partnership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(4)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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