5.875 % Senior Notes due 2019

Exhibit 4.1

BOSTON PROPERTIES LIMITED PARTNERSHIP

ISSUER

to

THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.

TRUSTEE

Supplemental Indenture No. 8

Dated as of October 9, 2009

$700,000,000

of

5.875 % Senior Notes due 2019

TABLE OF CONTENTS

THIS SUPPLEMENTAL INDENTURE NO. 8, dated as of October 9, 2009 (the “ Eighth Supplemental Indenture ”), between BOSTON PROPERTIES LIMITED PARTNERSHIP, a Delaware limited partnership (the “ Company ”), and THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A., a national banking association, as trustee (herein called the “ Trustee ”).

WITNESSETH:

WHEREAS, the Company has heretofore delivered to the Trustee an Indenture dated as of December 13, 2002 (the “ Senior Indenture ”), providing for the issuance by the Company from time to time of its senior debt securities evidencing its unsecured and unsubordinated indebtedness (the “ Securities ”).

WHEREAS, Section 3.01 of the Senior Indenture provides for various matters with respect to any series of Securities issued under the Senior Indenture to be established in an indenture supplemental to the Senior Indenture.

WHEREAS, Section 9.01(7) of the Senior Indenture provides for the Company and the Trustee to enter into an indenture supplemental to the Senior Indenture to establish the form or terms of Securities of any series as provided by Sections 2.01 and 3.01 of the Senior Indenture.

WHEREAS, the Board of Directors of Boston Properties, Inc. (“ Boston Properties ”), the general partner of the Company, has duly adopted resolutions authorizing the Company to execute and deliver this Eighth Supplemental Indenture; and

WHEREAS, all of the conditions and requirements necessary to make this Eighth Supplemental Indenture, when duly executed and delivered, a valid and binding agreement in accordance with its terms and for the purposes herein expressed, have been performed and fulfilled.

NOW, THEREFORE, THIS EIGHTH SUPPLEMENTAL INDENTURE WITNESSETH:

For and in consideration of the premises and the purchase of the series of Securities provided for herein by the Holders thereof, it is mutually covenanted and agreed, for the equal and proportionate benefit of all Holders of Securities of such series, as follows:

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ARTICLE ONE

RELATION TO SENIOR INDENTURE; DEFINITIONS

SECTION 1.1. Relation to Senior Indenture .

This Eighth Supplemental Indenture constitutes an integral part of the Senior Indenture.

SECTION 1.2. Definitions .

For all purposes of this Eighth Supplemental Indenture, except as otherwise expressly provided for or unless the context otherwise requires:

(1) Capitalized terms used but not defined herein shall have the respective meanings assigned to them in the Senior Indenture; and

(2) All references herein to Articles and Sections, unless otherwise specified, refer to the corresponding Articles and Sections of this Eighth Supplemental Indenture.

“ Annualized Consolidated EBITDA ” means, for any quarter, the product of Consolidated EBITDA for such period of time multiplied by four (4), provided that any non-recurring item that is an expense shall be added back to net income in determining such Consolidated EBITDA before such multiplication and deducted once from such product, and further provided that any non-recurring item that is income shall be added to such product once and shall not be multiplied by four.

“ Annualized Interest Expense ” means, for any quarter, the Interest Expense for that quarter multiplied by four (4).

“ Another Person’s Share ” means, in connection with the defined term “Contingent Liabilities of Boston Properties Limited Partnership and Subsidiaries”, (1) the aggregate direct and indirect interests of each Person other than the Company or any of its Subsidiaries in the equity capital of the applicable Partially-Owned Entity, calculated by subtracting from 100% the Percentage Interest with respect to such Partially-Owned Entity, or (2) in the case of reimbursement owed to the Company or any of its Subsidiaries by a third party in respect of payment made under a guaranty, the amount to be reimbursed to the Company or any of its Subsidiaries by such third party.

“ Applicable Procedures ” means, with respect to any transfer or exchange of beneficial interests in any Global Note, the rules and procedures of the Depositary that apply to such transfer or exchange.

“ Capitalization Rate ” means: (i) 9.0% for properties other than the CBD Properties, and (ii) 8.0% for properties which are CBD Properties.

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“ Capitalized Property Value ” means, as of any date, the sum of (1) with respect to CBD Properties and non-CBD Properties, in each case that are not hotel properties, the aggregate sum of all Property EBITDA for each such CBD Property and non-CBD Property for the Latest Completed Quarter prior to such date, annualized (i.e., multiplied by four (4)), and capitalized at the applicable Capitalization Rate plus (2) with respect to CBD Properties and non-CBD Properties, in each case that are hotel properties, the aggregate sum of all Property EBITDA for each such CBD Property and non-CBD Property for the most recent four (4) consecutive completed fiscal quarters, capitalized at the applicable Capitalization Rate; provided , however , that if the value of a particular property calculated pursuant to clause (1) or (2) above, as applicable, is less than the undepreciated book value of such property, as determined in accordance with GAAP, such undepreciated book value shall be used in lieu thereof with respect to such property.

“ CBD Properties ” means each of the properties set forth on Schedule A attached hereto, together with each additional property which is, from time to time, determined in good faith by the Company to be located within the central business district of a CBD Market and designated by the Company as a CBD Property in accordance with Section 2.19 hereof.

“ CBD Markets ” means each of the markets set forth on Schedule B attached hereto.

“ Comparable Treasury Issue ” means the United States Treasury security selected by an Independent Investment Banker as having a maturity comparable to the remaining term of the Notes that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of such Notes.

“ Comparable Treasury Price ” means, with respect to any Redemption Date, (a) the bid price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) at 4:00 P.M. on the third business day preceding such Redemption Date, as set forth on “Reuters Page 500” (or such other page as may replace Reuters Page 500), or (b) if such page (or any successor page) is not displayed or does not contain such bid prices at such time (i) the average of the Reference Treasury Dealer Quotations obtained by the Trustee for such Redemption Date, after excluding the highest and lowest of four such Reference Treasury Dealer Quotations, or (ii) if the Trustee is unable to obtain at least four such Reference Treasury Dealers Quotations, the average of all Reference Treasury Dealer Quotations obtained by the Trustee.

“ Consolidated EBITDA ” means, for any period of time, without duplication (1) net income (loss), excluding net derivative gains and gains (losses) on dispositions of real estate, before deductions for (i) Interest Expense, (ii) taxes, (iii) depreciation, amortization, net derivative losses and all other non-cash items, as determined in good faith by the Company, deducted in arriving at net income (loss), (iv) extraordinary items, (v) non-recurring items, as determined in good faith by the Company (including prepayment penalties), and (vi) noncontrolling interest, of the Company and its Subsidiaries; plus (2) the product of (A) net income (loss), excluding net derivative gains

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and gains (losses) on dispositions of real estate, before deductions for (i) interest expense, (ii) taxes, (iii) depreciation, amortization, net derivative losses and all other non-cash items, as determined in good faith by the Company, deducted in arriving at net income (loss), (iv) extraordinary items, and (v) non-recurring items, as determined in good faith by the Company (including prepayment penalties), of Partially-Owned Entities, multiplied by (B) the Company’s and its Subsidiaries’ percentage share of such Partially-Owned Entities; minus (3) the Company’s income (loss) from Partially-Owned Entities. In each of cases (1), (2) and (3) for such period, amounts shall be as reasonably determined by the Company in accordance with GAAP, except to the extent GAAP is not applicable with respect to the determination of all non-cash and non-recurring items. Consolidated EBITDA shall be adjusted, without duplication, to give pro forma effect: (x) in the case of any assets having been placed-in-service or removed from service since the beginning of the period and on or prior to the date of determination, to include or exclude, as the case may be, any Consolidated EBITDA earned or eliminated as a result of the placement of such assets in service or removal of such assets from service as if the placement of such assets in service or removal of such assets from service occurred at the beginning of the period; and (y) in the case of any acquisition or disposition of any asset or group of assets since the beginning of the period and on or prior to the date of determination, including, without limitation, by merger, or stock or asset purchase or sale, to include or exclude, as the case may be, any Consolidated EBITDA earned or eliminated as a result of the acquisition or disposition of those assets as if the acquisition or disposition occurred at the beginning of the period.

“ Consolidated Financial Statements ” means, with respect to any Person, collectively, the consolidated financial statements and notes to those financial statements, of that Person and its subsidiaries prepared in accordance with GAAP. For purposes of this definition, if as of any date or for any period actual consolidated financial statements of any Person have not been prepared, then this term shall include the books and records of that Person ordinarily used in the preparation of such financial statements.

“ Contingent Liabilities of Boston Properties Limited Partnership and Subsidiaries ” means, as of any date, without duplication, those liabilities of the Company or any of its Subsidiaries consisting of indebtedness for borrowed money, as determined in accordance with GAAP, that are or would be stated and quantified as contingent liabilities in the notes to the Consolidated Financial Statements of the Company as of that date; provided , however , that Contingent Liabilities of Boston Properties Limited Partnership and Subsidiaries shall exclude Another Person’s Share of Duplicated Obligations.

“ Debt ” means, as of any date, without duplication, (1) in the case of the Company, all indebtedness and liabilities for borrowed money, secured or unsecured, of the Company, including the Notes to the extent outstanding from time to time; (2) in the case of the Company’s Subsidiaries, all indebtedness and liabilities for borrowed money, secured or unsecured, of the Subsidiaries, including in each of cases (1) and (2) mortgage and other notes payable, but excluding in each of cases (1) and (2) any indebtedness, including mortgages and other notes payable, which is secured by cash, cash equivalents or marketable securities or defeased (it being understood that cash collateral shall be

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deemed to include cash deposited with a trustee with respect to third party indebtedness; provided that such trustee holds such cash for not more than 60 days from the date of deposit); and (3) all Contingent Liabilities of Boston Properties Limited Partnership and Subsidiaries. It is understood that Debt shall not include any redeemable equity interest in the Company.

“ Defaulted Interest ” has the meaning specified in Section 2.3 hereof.

“ Definitive Note ” means a certificated Note in the form of Exhibit A hereto, registered in the name of the Holder thereof and issued in accordance with Section 2.11 hereof, except that such Note shall not bear the Global Note Legend.

“ Depositary ” has the meaning assigned to it in Section 2.9(a) hereof.

“ Duplicated Obligations ” means, as of any date, collectively, all those payment guaranties in respect of indebtedness and other liabilities, secured or unsecured, of Partially-Owned Entities, including mortgage and other notes payable, for which (1) the Company or any of its Subsidiaries, on the one hand, and another Person or Persons, on the other hand, are jointly and severally liable or (2) the Company or any of its Subsidiaries are entitled to reimbursement in respect of payment under such guaranties from another Person or Persons.

“ GAAP ” means generally accepted accounting principles in the United States, consistently applied, as in effect from time to time.

“ Global Notes ” means, individually or collectively, any of the Notes issued as Global Securities under the Senior Indenture.

“ Global Note Legend ” means the legend set forth in Section 2.03 of the Senior Indenture, which is required to be placed on all Global Notes issued under the Senior Indenture.

“ Holders ” has the meaning specified in Section 2.3 hereof.

“ Incur ” means, with respect to any Debt or other obligation of any Person, to create, assume, guarantee or otherwise become liable in respect of the Debt or other obligation, and “ Incurrence ” and “ Incurred ” have the meanings correlative to the foregoing.

“ Independent Investment Banker ” means such independent investment banking institution of national standing appointed by the Company from time to time.

“ Indirect Participant ” means a Person who holds a beneficial interest in a Global Note through a Participant.

“ Intercompany Debt ” means, as of any date, Debt to which the only parties are Boston Properties, the Company, any Subsidiary of either of them as of that date or any Partially-Owned Entity.

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“ Interest Expense ” means, for any period of time, the aggregate amount of interest recorded in accordance with GAAP for such period of time by the Company and its Subsidiaries, but excluding: (i) interest reserves funded from the proceeds of any loan and (ii) amortization of deferred financing costs; and including, without duplication: (A) effective interest in respect of original issue discount as determined in accordance with GAAP; and (B) without limitation or duplication, the interest expense (determined as provided above) of Partially-Owned Entities, multiplied by the Company’s Percentage Interest of the Partially-Owned Entity Outstanding Debt in such Partially-Owned Entities, in all cases as reflected in the applicable Consolidated Financial Statements.

“ Interest Payment Date ” has the meaning specified in Section 2.3 hereof.

“ Latest Completed Quarter ” means the most recently ended fiscal quarter of the Company for which Consolidated Financial Statements of the Company have been completed, it being understood that at any time when the Company is subject to the informational requirements of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”), and in accordance therewith files annual and quarterly reports with the Commission, the term “Latest Completed Quarter” shall be deemed to refer to the fiscal quarter covered by the Company’s most recently filed Quarterly Report on Form 10-Q, or, in the case of the last fiscal quarter of the year, the Company’s Annual Report on Form 10-K.

“ Lien ” means, without duplication, any lien, mortgage, trust deed, deed of trust, deed to secure debt, pledge, security interest, assignment for collateral purposes, deposit arrangement, or other security agreement, excluding any right of setoff but including, without limitation, any conditional sale or other title retention agreement, any financing lease having substantially the same economic effect as any of the foregoing, and any other like agreement granting or conveying a security interest; provided , that for purposes hereof, “Lien” shall not include any mortgage that has been defeased by the Company, any of its Subsidiaries or any of the Partially-Owned Entities in accordance with the provisions thereof through the deposit of cash, cash equivalents or marketable securities (it being understood that cash collateral shall be deemed to include cash deposited with a trustee with respect to third party indebtedness).

“ Notes ” has the meaning specified in Section 2.1 hereof.

“ Partially-Owned Entity ” means, at any time, any of the partnerships, associations, corporations, limited liability companies, trusts, joint ventures or other business entities in which the Company, directly, or indirectly through full or partial ownership of another entity, owns an equity interest, but which is not required in accordance with GAAP to be consolidated with the Company for financial reporting purposes.

“ Partially-Owned Entity Outstanding Debt ” means, as of any date, the aggregate principal amount of all outstanding indebtedness and liabilities for borrowed money, secured or unsecured, of the applicable Partially-Owned Entity, including mortgage and other notes payable but excluding any indebtedness which is secured by cash, cash

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equivalents or marketable securities or defeased (it being understood that cash collateral shall be deemed to include cash deposited with a trustee with respect to third party indebtedness), all as reflected in the Consolidated Financial Statements of such Partially-Owned Entity as of such date.

“ Participant ” means, with respect to the Depositary, a Person who has an account with the Depositary, as the case may be (and, with respect to The Depository Trust Company, shall include Euroclear and Clearstream).

“ Percentage Interest ” means, with respect to a Partially-Owned Entity, the Company’s direct or indirect interest in the equity capital of such entity without giving effect to any incentive or performance-based sharing in the entity’s cash flow from operations or proceeds from capital transactions in excess of such equity interest.

“ Property EBITDA ” means for any property, CBD Property or non-CBD Property, for any period of time, without duplication, (1) if the property is owned by the Company or any of its Subsidiaries, the net income (loss) derived from such property, excluding net derivative gains and gains (losses) on dispositions of real estate, before deductions for (i) Interest Expense, (ii) taxes, (iii) depreciation, amortization, net derivative losses and all other non-cash items, as determined in good faith by the Company, deducted in arriving at net income (loss), (iv) extraordinary items, (v) non-recurring items, as determined in good faith by the Company (including prepayment penalties), and (vi) noncontrolling interest, and (2) if the property is owned by a Partially-Owned Entity, the product of (A) net income (loss) derived from such property, excluding net derivative gains and gains (losses) on dispositions of real estate, before deductions for (i) interest expense, (ii) taxes, (iii) depreciation, amortization, net derivative losses and all other non-cash items, as determined in good faith by the Company, deducted in arriving at net income (loss), (iv) extraordinary items, and (v) non-recurring items, as determined in good faith by the Company (including prepayment penalties), multiplied by (B) the Company’s and its Subsidiaries’ percentage share of such Partially-Owned Entity. In each of cases (1) and (2) for such period, amounts shall be as reasonably determined by the Company in accordance with GAAP, except to the extent GAAP is not applicable with respect to the determination of all non-cash and non-recurring items. Property EBITDA shall be adjusted, without duplication, to give pro forma effect: (x) in the case of any assets having been placed-in-service or removed from service since the beginning of the period and on or prior to the date of determination, to include or exclude, as the case may be, any Property EBITDA earned or eliminated as a result of the placement of such assets in service or removal of such assets from service as if the placement of such assets in service or removal of such assets from service occurred at the beginning of the period; and (y) in the case of any acquisition or disposition of any asset or group of assets since the beginning of the period and on or prior to the date of determination, including, without limitation, by merger, or stock or asset purchase or sale, to include or exclude, as the case may be, any Property EBITDA earned or eliminated as a result of the acquisition or disposition of those assets as if the acquisition or disposition occurred at the beginning of the period. For purposes of this definition, in the case of (1) and (2) above, Property EBITDA shall exclude general and administrative expenses as reflected in the Company’s audited year-end Consolidated Financial

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Statements or reviewed interim Consolidated Financial Statements available for the Latest Completed Quarter or the most recent four (4) consecutive completed fiscal quarters, as applicable.

“ Reference Treasury Dealer ” means, as determined by the Company, either (a) Banc of America Securities LLC, Citigroup Global Markets Inc. and Deutsche Bank Securities Inc. (or any of their respective successors) and one other primary U.S. government securities dealer in New York City (a “ Primary Treasury Dealer ”) appointed by the Company or (b) one Primary Treasury Dealer appointed by the Company and three other Primary Treasury Dealers selected by the Independent Investment Banker; provided , however , that if any of the foregoing shall cease to be a Primary Treasury Dealer, the Company shall substitute therefor another Primary Treasury Dealer.

“ Reference Treasury Dealer Quotations ” means, with respect to each Reference Treasury Dealer and any Redemption Date for the Notes, an average, as determined by the Trustee, of the bid and asked prices for the Comparable Treasury Issue for the Notes (expressed in each case as a percentage of its principal amount) quoted in writing to the Trustee by such Reference Treasury Dealer at 5:00 p.m., New York City time, on the third business day preceding such Redemption Date.

“ Regular Record Date ” has the meaning specified in Section 2.3 hereof.

“ Secured Debt ” means, as of any date, that portion of Total Outstanding Debt as of that date that is secured by a Lien on properties or other assets of the Company, any of its Subsidiaries or any of the Partially-Owned Entities.

“ Securities Act ” means the Securities Act of 1933, as amended from time to time.

“ Special Record Date ” has the meaning specified in Section 2.3 hereof.

“ Stated Maturity Date ” has the meaning specified in Section 2.3 hereof.

“ Subsidiary ” means, with respect to any Person, a corporation, partnership association, joint venture, trust, limited liability company or other business entity which is required to be consolidated with the Company or Boston Properties in accordance with GAAP.

“ Total Assets ” means, with respect to any Incurrence of Debt or Secured Debt, as of any date, in each case as determined by the Company without duplication, the sum of: (1) Capitalized Property Value; (2) cash, cash equivalents and marketable securities of the Company and its Subsidiaries, determined in accordance with GAAP; (3) with respect to notes receivable and mortgages, the lesser of (i) the aggregate amount of principal under such note or mortgage that will be due and payable to the Company or its Subsidiaries and (ii) the purchase price paid by the Company or its Subsidiaries to acquire such note or mortgage; (4) with respect to real estate assets which are undeveloped land, the book value thereof in accordance with GAAP; (5) without duplication, the cost basis of properties of the Company and its Subsidiaries that are under development, determined in accordance with GAAP, as of the end of the quarterly

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period used for purposes of clause (1) above; (6) without duplication, the proceeds of the Debt or Secured Debt or the assets to be acquired in exchange for such proceeds, as the case may be, other than Intercompany Debt, Incurred from the end of the Latest Completed Quarter prior to the Incurrence of the Debt or Secured Debt, as the case may be, to the date of determination; and (7) the Company’s and its Subsidiaries’ percentage share of Partially-Owned Entities’ assets described in clauses (1), (2), (3), (4), (5) and (6) above.

“ Total Outstanding Debt ” means, as of any date, the sum, without duplication, of (1) the aggregate principal amount of all outstanding Debt of the Company as of that date; (2) the aggregate principal amount of all outstanding Debt of the Company’s Subsidiaries, all as of that date; and (3) the sum of the aggregate principal amount of all Partially-Owned Entity Outstanding Debt of each of the Partially-Owned Entities multiplied by the Company’s respective Percentage Interest in such Partially-Owned Entity as of that date.

“ Treasury Yield ” means, with respect to any Redemption Date applicable to the Notes, the rate per annum equal to the semi-annual equivalent yield to maturity (computed as of the third business day immediately preceding such Redemption Date) of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the applicable Comparable Treasury Price for such Redemption Date.

“ Unencumbered Assets ” means, as of any date, in each case as determined by the Company without duplication, the sum of: (1) Unencumbered Capitalized Property Value; (2) cash, cash equivalents and marketable securities of the Company and its Subsidiaries, other than restricted cash, cash equivalents and marketable securities pledged to secure Debt, determined in accordance with GAAP; (3) with respect to notes receivable and mortgages, the lesser of (i) the aggregate amount of principal under such note or mortgage that will be due and payable to the Company or its Subsidiaries and (ii) the purchase price paid by the Company or its Subsidiaries to acquire such note or mortgage, except any notes receivable or mortgages that are serving as collateral for Secured Debt; (4) with respect to real estate assets which are undeveloped land, the book value thereof in accordance with GAAP, except any land that is serving as collateral for Secured Debt; (5) without duplication, the cost basis of properties of the Company and its Subsidiaries that are under development, determined in accordance with GAAP, as of the end of the quarterly period used for purposes of clause (1) above, except any properties that are serving as collateral for Secured Debt; (6) without duplication, the proceeds of the Debt or Secured Debt or the assets to be acquired in exchange for such proceeds, as the case may be, other than Intercompany Debt, Incurred from the end of the Latest Completed Quarter prior to such date to the date of determination, except in each case any proceeds or assets that are serving as collateral for Secured Debt; and (7) the Company’s and its Subsidiaries’ percentage share, of Partially-Owned Entities’ assets described in clauses (1), (2), (3), (4), (5) and (6) above. For the avoidance of doubt, cash held by a “qualified intermediary” in connection with proposed like-kind exchanges pursuant to Section 1031 of the Internal Revenue Code of 1986, as amended, which may be classified as “restricted” for GAAP purposes shall nonetheless be included in clause

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(2) above, so long as the Company or any of its Subsidiaries has the right to (i) direct the qualified intermediary to return such cash to the Company or such Subsidiary if and when the Company or such Subsidiary fails to identify or acquire the proposed like-kind property or at the end of the 180-day replacement period or (ii) direct the qualified intermediary to use such cash to acquire like-kind property.

“ Unencumbered Capitalized Property Value ” means, as of any date, the sum of (1) with respect to CBD Properties and non-CBD Properties, in each case that are not hotel properties, the aggregate of all Unencumbered Property EBITDA for each such CBD Property and non-CBD Property for the Latest Completed Quarter prior to such date, annualized (i.e., multiplied by four (4)), and capitalized at the applicable Capitalization Rate plus, (2) with respect to CBD Properties and non-CBD Properties, in each case that are hotel properties, the aggregate of all Unencumbered Property EBITDA for each such CBD Property and non-CBD Property for the most recent four (4) consecutive complete fiscal quarters, capitalized at the applicable Capitalization Rate; provided , however , that if the value of a particular property calculated pursuant to clause (1) or (2) above, as applicable, is less than the undepreciated book value of such property determined in accordance with GAAP, such undepreciated book value shall be used in lieu thereof with respect to such property.

“ Unencumbered Consolidated EBITDA ” means, for any period of time, Consolidated EBITDA for such period of time less any portion thereof attributable to assets serving as collateral for Secured Debt.

“ Unencumbered Property EBITDA ” means, for any period of time, Property EBITDA for such period of time less any portion thereof attributable to assets serving as collateral for Secured Debt.

“ Unsecured Debt ” means, as of any date, that portion of Total Outstanding Debt as of that date that is neither Secured Debt nor Contingent Liabilities of Boston Properties Limited Partnership and Subsidiaries.

ARTICLE TWO

THE NOTES

SECTION 2.1. Title of the Securities .

There shall be a series of Securities designated the “5.875% Senior Notes due 2019” (the “ Notes ”).

SECTION 2.2. Limitation on Initial Aggregate Principal Amount; Further Issuances .

The aggregate principal amount of the Notes initially shall be limited to $700,000,000. The Company may, from time to time, subject to Section 2.4 of this

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Eighth Supplemental Indenture and applicable law, create and issue additional Notes under this Eighth Supplemental Indenture ranking equally and ratably with the outstanding Notes in all respects (or in all respects except for the payment of interest accruing prior to the issue date of such additional Notes or except for the first payment of interest following the issue date of such additional Notes) without notice to or the consent of the Holders of outstanding Notes. The initially issued Notes and any additional Notes subsequently issued shall be consolidated and form a single series with the outstanding Notes for all purposes of this Eighth Supplemental Indenture and shall have the same terms as to status, redemption or otherwise as the outstanding Notes. Any such additional Notes referred to in this Section 2.2 will be issued under a further supplemental indenture.

Nothing contained in this Section 2.2 or elsewhere in this Eighth Supplemental Indenture, or in the Notes, is intended to or shall limit execution by the Company or authentication or delivery by the Trustee of Notes under the circumstances contemplated by Sections 3.03, 3.04, 3.05, 3.06, 9.06, 11.07 and 13.05 of the Senior Indenture.

SECTION 2.3. Interest and Interest Rates; Maturity Date of Notes .

(a) The Notes shall bear interest at 5.875% per annum from October 9, 2009 or from the immediately preceding Interest Payment Date (as defined below) to which interest has been paid, payable semi-annually in arrears on April 15 and October 15 of each year, commencing April 15, 2010 (each, an “ Interest Payment Date ”), to the persons (the “ Holders ”) in whose name the applicable Notes are registered in the Security Register at the close of business 15 calendar days prior to such Interest Payment Date ( i.e. , March 31 and September 30, respectively) (regardless of whether such day is a Business Day, as defined below), as the case may be (each, a “ Regular Record Date ”). Interest on the Notes shall be computed on the basis of a 360-day year of twelve 30-day months. Interest, if any, not punctually paid or duly provided for on any Interest Payment Date with respect to a Note (“ Defaulted Interest ”) shall forthwith cease to be payable to the Holder on the applicable Regular Record Date and may either be paid to the person in whose name such Note is registered at the close of business on a special record date (the “ Special Record Date ”) for the payment of such Defaulted Interest to be fixed by the Trustee, notice of which shall be given to the Hol