AGREEMENT OF LIMITED PARTNERSHIP

Exhibit 3.1

FOURTH AMENDED AND RESTATED

AGREEMENT OF LIMITED PARTNERSHIP

OF

MAGELLAN MIDSTREAM PARTNERS, L.P.

TABLE OF CONTENTS

FOURTH AMENDED AND RESTATED

AGREEMENT OF LIMITED PARTNERSHIP

OF

MAGELLAN MIDSTREAM PARTNERS, L.P.

THIS FOURTH AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF MAGELLAN MIDSTREAM PARTNERS, L.P. dated as of April 13, 2005, is entered into by and among Magellan GP, LLC, a Delaware limited liability company, as the General Partner and as the lawful agent and attorney-in-fact for the Limited Partners, together with any other Persons who become Partners in the Partnership or parties hereto as provided herein.

WHEREAS, the Predecessor General Partner and the other parties thereto entered into that certain Second Amended and Restated Agreement of Limited Partnership of the Partnership dated as of September 27, 2002 (the “ 2002 Agreement ”);

WHEREAS, the General Partner and the other parties thereto entered into the GP Transfer Agreement, pursuant to which the Predecessor General Partner transferred its General Partner Interest and Incentive Distribution Rights in the Partnership to the General Partner;

WHEREAS, the General Partner effected Amendment No. 1 to the 2002 Agreement on November 15, 2002 to reduce the voting power of the Class B Common Units and Subordinated Units;

WHEREAS, the General Partner effected Amendment No. 2 to the 2002 Agreement on November 15, 2002 to provide for the right of the Limited Partners to vote their Outstanding Limited Partner Interests as a single class to elect annually the Board of Directors of the General Partner;

WHEREAS, on June 17, 2003 Holdings acquired 1,079,694 Common Units, 5,679,694 Subordinated Units and 7,830,924 Class B Common Units and all of the membership interests in the General Partner from Williams Energy Services, LLC, Williams Natural Gas Liquids, Inc. and the Predecessor General Partner;

WHEREAS, on June 17, 2003 the parties thereto entered into the New Omnibus Agreement and New Services Agreement;

WHEREAS, on December 1, 2003 the Class B Common Units were converted into Common Units and cancelled;

WHEREAS, the General Partner effected Amendment No. 3 to the 2002 Agreement on December 12, 2003 to amend certain provisions (i) relating to the allocations of the General Partner in connection with the payment of Excess G&A Expenses and the funding of certain Assumed Environmental Indemnification Obligations of the Partnership, (ii) amending Section 5.7(b) to provide for the issuance of Common Units and Parity Units without the prior approval of the Unitholders if such issuance relates to an Acquisition or Capital Improvement, (iii) adding Section 5.7(f) providing for the issuance of an unlimited number of Common Units

during the Subordination Period if the net proceeds of such issuance are used to redeem an equal number of Outstanding Common Units, and (iv) reflecting the various name changes of the General Partner, the Partnership, and certain other members of the Partnership Group;

WHEREAS, the General Partner amended and restated the 2002 Agreement in its entirety to reflect each of the foregoing amendments, together with such other changes the General Partner determined were necessary and appropriate, and such amended and restated agreement is the Third Amended and Restated Agreement of Limited Partnership of Magellan Midstream Partners, L.P. dated as of April 22, 2004 (the “ 2004 Agreement ”);

WHEREAS, the General Partner effected Amendment No. 1 to the 2004 Agreement on July 22, 2004 to amend certain provisions relating to the number of Parity Units the Partnership may issue;

WHEREAS, the General Partner effected Amendment No. 2 to the 2004 Agreement on July 22, 2004 to amend certain provisions relating to the distributions to the holder of the Incentive Distribution Rights;

WHEREAS, the General Partner desires to amend and restate the 2004 Agreement in its entirety to reflect each of the foregoing amendments to the 2004 Agreement, together with various numerical changes to the 2004 Agreement resulting from the two-for-one split of the Partnership’s Common Units and Subordinated Units (the “Unit Split” ) declared by the General Partner on March 11, 2005, having a record date of April 5, 2005 and a payment date of April 12, 2005; and

WHEREAS, Section 13.1(d) of the 2004 Agreement permits the General Partner, without the approval of any Partner or Assignee, to amend the 2004 Agreement to reflect any change that, in the discretion of the General Partner, does not adversely affect the Limited Partners (including any particular class of Partnership Interests as compared to other classes of Partnership Interests) in any material respect.

NOW, THEREFORE, the General Partner, pursuant to its authority under Section 13.1(d) and the exercise of its discretion, does hereby amend and restate the 2004 Agreement to provide, in its entirety, as follows:

ARTICLE I.

DEFINITIONS

Section 1.1. Definitions.

The following definitions shall be for all purposes, unless otherwise clearly indicated to the contrary, applied to the terms used in this Agreement.

“2002 Agreement” has the meaning set forth in the recitals.

“ 2004 Agreement ” has the meaning set forth in the recitals.

“Accretion Test” has the meaning assigned to such term in Section 5.7(g).

“ Acquisition ” means any transaction in which any Group Member acquires (through an asset acquisition, merger, stock acquisition or other form of investment) control over all or a portion of the assets, properties or business of another Person for the purpose of increasing the operating capacity or revenues of the Partnership Group from the operating capacity or revenues of the Partnership Group existing immediately prior to such transaction.

“ Additional Book Basis ” means the portion of any remaining Carrying Value of an Adjusted Property that is attributable to positive adjustments made to such Carrying Value as a result of Book-Up Events. For purposes of determining the extent that Carrying Value constitutes Additional Book Basis:

(i) Any negative adjustment made to the Carrying Value of an Adjusted Property as a result of either a Book-Down Event or a Book-Up Event shall first be deemed to offset or decrease that portion of the Carrying Value of such Adjusted Property that is attributable to any prior positive adjustments made thereto pursuant to a Book-Up Event or Book-Down Event.

(ii) If Carrying Value that constitutes Additional Book Basis is reduced as a result of a Book-Down Event and the Carrying Value of other property is increased as a result of such Book-Down Event, an allocable portion of any such increase in Carrying Value shall be treated as Additional Book Basis; provided that the amount treated as Additional Book Basis pursuant hereto as a result of such Book-Down Event shall not exceed the amount by which the Aggregate Remaining Net Positive Adjustments after such Book-Down Event exceeds the remaining Additional Book Basis attributable to all of the Partnership’s Adjusted Property after such Book-Down Event (determined without regard to the application of this clause (ii) to such Book-Down Event).

“ Additional Book Basis Derivative Items ” means any Book Basis Derivative Items that are computed with reference to Additional Book Basis. To the extent that the Additional Book Basis attributable to all of the Partnership’s Adjusted Property as of the beginning of any taxable period exceeds the Aggregate Remaining Net Positive Adjustments as of the beginning of such period (the “ Excess Additional Book Basis ”), the Additional Book Basis Derivative Items for such period shall be reduced by the amount that bears the same ratio to the amount of Additional Book Basis Derivative Items determined without regard to this sentence as the Excess Additional Book Basis bears to the Additional Book Basis as of the beginning of such period.

“ Additional Limited Partner ” means a Person admitted to the Partnership as a Limited Partner pursuant to Section 10.4 and who is shown as such on the books and records of the Partnership.

“ Adjusted Capital Account ” means the Capital Account maintained for each Partner as of the end of each fiscal year of the Partnership, (a) increased by any amounts that such Partner is obligated to restore under the standards set by Treasury Regulation Section 1.704-1(b)(2)(ii)(c) (or is deemed obligated to restore under Treasury Regulation Sections 1.704-2(g) and 1.704-2(i)(5)) and (b) decreased by (i) the amount of all losses and deductions that, as of the end of such fiscal year, are reasonably expected to be allocated to such Partner in subsequent years under Sections 704(e)(2) and 706(d) of the Code and Treasury Regulation Section 1.751-

1(b)(2)(ii), and (ii) the amount of all distributions that, as of the end of such fiscal year, are reasonably expected to be made to such Partner in subsequent years in accordance with the terms of this Agreement or otherwise to the extent they exceed offsetting increases to such Partner’s Capital Account that are reasonably expected to occur during (or prior to) the year in which such distributions are reasonably expected to be made (other than increases as a result of a minimum gain chargeback pursuant to Section 6.1(d)(i) or 6.1(d)(ii)). The foregoing definition of Adjusted Capital Account is intended to comply with the provisions of Treasury Regulation Section 1.704-1(b)(2)(ii)(d) and shall be interpreted consistently therewith. The “ Adjusted Capital Account ” of a Partner in respect of a General Partner Interest, a Common Unit, a Subordinated Unit or an Incentive Distribution Right or any other specified interest in the Partnership shall be the amount which such Adjusted Capital Account would be if such General Partner Interest, Common Unit, Subordinated Unit, Incentive Distribution Right or other interest in the Partnership were the only interest in the Partnership held by a Partner from and after the date on which such General Partner Interest, Common Unit, Subordinated Unit, Incentive Distribution Right or other interest was first issued.

“ Adjusted Operating Surplus” means, with respect to any period, Operating Surplus generated during such period (a) less (i) any net increase in Working Capital Borrowings during such period and (ii) any net reduction in cash reserves for Operating Expenditures during such period not relating to an Operating Expenditure made during such period, and (b) plus (i) any net decrease in Working Capital Borrowings during such period and (ii) any net increase in cash reserves for Operating Expenditures during such period required by any debt instrument for the repayment of principal, interest or premium. Adjusted Operating Surplus does not include that portion of Operating Surplus included in clause (a)(i) of the definition of Operating Surplus.

“ Adjusted Property ” means any property the Carrying Value of which has been adjusted pursuant to Section 5.5(d)(i) or 5.5(d)(ii).

“ Affiliate ” means, with respect to any Person, any other Person that directly or indirectly through one or more intermediaries controls, is controlled by or is under common control with, the Person in question. As used herein, the term “control” means the possession, direct or indirect, of the power to direct or cause the direction of the management and policies of a Person, whether through ownership of voting securities, by contract or otherwise.

“ Aggregate Remaining Net Positive Adjustments ” means, as of the end of any taxable period, the sum of the Remaining Net Positive Adjustments of all the Partners.

“ Agreed Allocation ” means any allocation, other than a Required Allocation, of an item of income, gain, loss or deduction pursuant to the provisions of Section 6.1, including, without limitation, a Curative Allocation (if appropriate to the context in which the term “ Agreed Allocation ” is used).

“ Agreed Value ” of any Contributed Property means the fair market value of such property or other consideration at the time of contribution as determined by the General Partner using such reasonable method of valuation as it may adopt. The General Partner shall, in its discretion, use such method as it deems reasonable and appropriate to allocate the aggregate Agreed Value of Contributed Properties contributed to the Partnership in a single or integrated transaction among each separate property on a basis proportional to the fair market value of each Contributed Property.

“ Agreement ” means this Fourth Amended and Restated Agreement of Limited Partnership of Magellan Midstream Partners, L.P., as it may be amended, supplemented or restated from time to time.

“ Assignee ” means a Non-citizen Assignee or a Person to whom one or more Limited Partner Interests have been transferred in a manner permitted under this Agreement and who has executed and delivered a Transfer Application as required by this Agreement, but who has not been admitted as a Substituted Limited Partner.

“ Associate ” means, when used to indicate a relationship with any Person, (a) any corporation or organization of which such Person is a director, officer or partner or is, directly or indirectly, the owner of 20% or more of any class of voting stock or other voting interest; (b) any trust or other estate in which such Person has at least a 20% beneficial interest or as to which such Person serves as trustee or in a similar fiduciary capacity; and (c) any relative or spouse of such Person, or any relative of such spouse, who has the same principal residence as such Person.

“Assumed Environmental Indemnification Obligations” means the obligation of Holdings to indemnify the Partnership Group for certain environmental remedial obligations pursuant to the Purchase Agreement dated as of April 18, 2003, as amended, among WEG Acquisitions, L.P., Williams Energy Services, LLC, Williams Natural Gas Liquids, Inc. and Williams GP LLC pursuant to which Holdings purchased all of the General Partner Interests, Class B Common Units and Subordinated Units and 1,079,694 Common Units.

“ Available Cash ” means, with respect to any Quarter ending prior to the Liquidation Date,

(a) the sum of (i) all cash and cash equivalents of the Partnership Group on hand at the end of such Quarter, and (ii) all additional cash and cash equivalents of the Partnership Group on hand on the date of determination of Available Cash with respect to such Quarter resulting from Working Capital Borrowings made subsequent to the end of such Quarter, less

(b) the amount of any cash reserves that is necessary or appropriate in the reasonable discretion of the General Partner to (i) provide for the proper conduct of the business of the Partnership Group (including reserves for future capital expenditures and for anticipated future credit needs of the Partnership Group) subsequent to such Quarter, (ii) comply with applicable law or any loan agreement, security agreement, mortgage, debt instrument or other agreement or obligation to which any Group Member is a party or by which it is bound or its assets are subject or (iii) provide funds for distributions under Section 6.4 or 6.5 in respect of any one or more of the next four Quarters; provided, however, that the General Partner may not establish cash reserves pursuant to (iii) above if the effect of such reserves would be that the Partnership is unable to distribute the Minimum Quarterly Distribution on all Common Units, plus any

Cumulative Common Unit Arrearage on all Common Units, with respect to such Quarter; and, provided further, that disbursements made by a Group Member or cash reserves established, increased or reduced after the end of such Quarter but on or before the date of determination of Available Cash with respect to such Quarter shall be deemed to have been made, established, increased or reduced, for purposes of determining Available Cash, within such Quarter if the General Partner so determines.

Notwithstanding the foregoing, “Available Cash” with respect to the Quarter in which the Liquidation Date occurs and any subsequent Quarter shall equal zero.

“ Bank Loan ” means the loan evidenced by the Credit Agreement, dated as of April 11, 2002, among Williams Pipe Line Company, LLC, Williams Energy Partners L.P., Bank of America, N.A., Lehman Commercial Paper, Inc., Salomon Smith Barney, Inc., J.P. Morgan Securities, Inc., and Merrill Lynch and Co., as the same may be extended, amended and restated.

“ Board of Directors ” means the Board of Directors of the General Partner (or comparable governing body of any successor to the General Partner).

“ Book Basis Derivative Items ” means any item of income, deduction, gain or loss included in the determination of Net Income or Net Loss that is computed with reference to the Carrying Value of an Adjusted Property (e.g., depreciation, depletion, or gain or loss with respect to an Adjusted Property).

“ Book-Down Event ” means an event which triggers a negative adjustment to the Capital Accounts of the Partners pursuant to Section 5.5(d).

“ Book-Tax Disparity ” means with respect to any item of Contributed Property or Adjusted Property, as of the date of any determination, the difference between the Carrying Value of such Contributed Property or Adjusted Property and the adjusted basis thereof for federal income tax purposes as of such date. A Partner’s share of the Partnership’s Book-Tax Disparities in all of its Contributed Property and Adjusted Property will be reflected by the difference between such Partner’s Capital Account balance as maintained pursuant to Section 5.5 and the hypothetical balance of such Partner’s Capital Account computed as if it had been maintained strictly in accordance with federal income tax accounting principles.

“ Book-Up Event ” means an event which triggers a positive adjustment to the Capital Accounts of the Partners pursuant to Section 5.5(d).

“ Business Day ” means Monday through Friday of each week, except that a legal holiday recognized as such by the government of the United States of America or the states of New York or Oklahoma shall not be regarded as a Business Day.

“ Capital Account ” means the capital account maintained for a Partner pursuant to Section 5.5. The “ Capital Account ” of a Partner in respect of a General Partner Interest, a Common Unit, a Subordinated Unit, an Incentive Distribution Right or any other Partnership Interest shall be the amount which such Capital Account would be if such General Partner Interest, Common Unit, Subordinated Unit, Incentive Distribution Right or other Partnership Interest were the only interest in the Partnership held by a Partner from and after the date on which such General Partner Interest, Common Unit, Subordinated Unit, Incentive Distribution Right or other Partnership Interest was first issued.

“ Capital Contribution ” means any cash, cash equivalents or the Net Agreed Value of Contributed Property that a Partner contributes to the Partnership pursuant to this Agreement or the Contribution and Conveyance Agreement.

“ Capital Improvement ” means any (a) addition or improvement to the capital assets owned by any Group Member or (b) acquisition of existing, or the construction of new capital assets (including, without limitation, pipeline systems, terminals, storage facilities and related assets), in each case made to increase the operating capacity or revenues of the Partnership Group from the operating capacity or revenues of the Partnership Group existing immediately prior to such addition, improvement, acquisition or construction.

“ Capital Surplus ” has the meaning assigned to such term in Section 6.3(a).

“ Carrying Value ” means (a) with respect to a Contributed Property, the Agreed Value of such property reduced (but not below zero) by all depreciation, amortization and cost recovery deductions charged to the Partners’ and Assignees’ Capital Accounts in respect of such Contributed Property, and (b) with respect to any other Partnership property, the adjusted basis of such property for federal income tax purposes, all as of the time of determination. The Carrying Value of any property shall be adjusted from time to time in accordance with Sections 5.5(d)(i) and 5.5(d)(ii) and to reflect changes, additions or other adjustments to the Carrying Value for dispositions and acquisitions of Partnership properties, as deemed appropriate by the General Partner.

“ Cause ” means a court of competent jurisdiction has entered a final, non-appealable judgment finding the General Partner liable for actual fraud, gross negligence or willful or wanton misconduct in its capacity as general partner of the Partnership.

“ Certificate ” means a certificate (i) substantially in the form of Exhibit A to this Agreement, (ii) issued in global form in accordance with the rules and regulations of the Depositary or (iii) in such other form as may be adopted by the General Partner in its discretion, issued by the Partnership evidencing ownership of one or more Common Units or a certificate, in such form as may be adopted by the General Partner in its discretion, issued by the Partnership evidencing ownership of one or more other Partnership Securities.

“ Certificate of Limited Partnership ” means the Certificate of Limited Partnership of the Partnership filed with the Secretary of State of the State of Delaware as referenced in Section 2.1, as such Certificate of Limited Partnership may be amended, supplemented or restated from time to time.

“ Citizenship Certification ” means a properly completed certificate in such form as may be specified by the General Partner by which an Assignee or a Limited Partner certifies that he (and if he is a nominee holding for the account of another Person, that to the best of his knowledge such other Person) is an Eligible Citizen.

“ Claim ” has the meaning assigned to such term in Section 7.12(c).

“ Closing Date ” means the first date on which Common Units were sold by the Partnership to the Underwriters pursuant to the provisions of the Underwriting Agreement.

“ Closing Price ” has the meaning assigned to such term in Section 15.1(a).

“ Code ” means the Internal Revenue Code of 1986, as amended and in effect from time to time. Any reference herein to a specific section or sections of the Code shall be deemed to include a reference to any corresponding provision of successor law.

“ Combined Interest ” has the meaning assigned to such term in Section 11.3(a).

“ Commenced Commercial Service ” and “ Commencement of Commercial Service ” have the meanings assigned to such terms in Section 5.7(g).

“ Commission ” means the United States Securities and Exchange Commission.

“ Common Unit ” means a Partnership Security representing a fractional part of the Partnership Interests of all Limited Partners and Assignees and of the General Partner (exclusive of its interest as a holder of the General Partner Interest and Incentive Distribution Rights) and having the rights and obligations specified with respect to Common Units in this Agreement. The term “ Common Unit ” does not refer to a Subordinated Unit prior to its conversion into a Common Unit pursuant to the terms hereof.

“ Common Unit Arrearage ” means, with respect to any Common Unit, whenever issued, as to any Quarter within the Subordination Period, the excess, if any, of (a) the Minimum Quarterly Distribution with respect to a Common Unit in respect of such Quarter over (b) the sum of all Available Cash distributed with respect to a Common Unit in respect of such Quarter pursuant to Section 6.4(a)(i).

“ Conflicts Committee ” means a committee of the Board of Directors of the General Partner composed entirely of three or more directors who meet the independence and experience requirements as set forth most recently by the New York Stock Exchange.

“ Contributed Property ” means each property or other asset, in such form as may be permitted by the Delaware Act, but excluding cash, contributed to the Partnership. Once the Carrying Value of a Contributed Property is adjusted pursuant to Section 5.5(d), such property shall no longer constitute a Contributed Property, but shall be deemed an Adjusted Property.

“ Contribution and Conveyance Agreement ” means that certain Contribution, Conveyance and Assumption Agreement, dated as of the Closing Date, among the Predecessor General Partner, the Partnership, Magellan OLP and certain other parties, together with the additional conveyance documents and instruments contemplated or referenced thereunder.

“ Cumulative Common Unit Arrearage ” means, with respect to any Common Unit, whenever issued, and as of the end of any Quarter, the excess, if any, of (a) the sum resulting from adding together the Common Unit Arrearage as to an Initial Common Unit for each of the Quarters within the Subordination Period ending on or before the last day of such Quarter over (b) the sum of any distributions theretofore made pursuant to Section 6.4(a)(ii) and the second sentence of Section 6.5 with respect to an Initial Common Unit (including any distributions to be made in respect of the last of such Quarters).

“ Curative Allocation ” means any allocation of an item of income, gain, deduction, loss or credit pursuant to the provisions of Section 6.1(d)(xi).

“ Current Market Price ” has the meaning assigned to such term in Section 15.1(a).

“ Delaware Act ” means the Delaware Revised Uniform Limited Partnership Act, 6 Del C. § 17-101, et seq., as amended, supplemented or restated from time to time, and any successor to such statute.

“ Departing Partner ” means a former General Partner from and after the effective date of any withdrawal or removal of such former General Partner pursuant to Section 11.1 or 11.2.

“ Depositary ” means, with respect to any Units issued in global form, The Depository Trust Company and its successors and permitted assigns.

“ Director ” means any member of the Board of Directors duly elected at an annual meeting of the Limited Partners of the Partnership.

“ Economic Risk of Loss ” has the meaning set forth in Treasury Regulation Section 1.752-2(a).

“ Eligible Citizen ” means a Person qualified to own interests in real property in jurisdictions in which any Group Member does business or proposes to do business from time to time, and whose status as a Limited Partner or Assignee does not or would not subject such Group Member to a significant risk of cancellation or forfeiture of any of its properties or any interest therein.

“ Event of Withdrawal ” has the meaning assigned to such term in Section 11.1(a).

“Excess G&A Expenses” means the excess of (i) the amount of any general and administrative expenses required to be reimbursed to the General Partner pursuant to Section 7.4, over (ii) the amount of such expenses permitted to be reimbursed by the Partnership Group pursuant to Article VII of the New Omnibus Agreement.

“ Final Subordinated Units ” has the meaning assigned to such term in Section 6.1(d)(x).

“ First Liquidation Target Amount ” has the meaning assigned to such term in Section 6.1(c)(i)(D).

“ First Target Distribution ” means $0.28875 per Unit per Quarter (or, with respect to the period commencing on the Closing Date and ending on March 31, 2001, it means the product of $0.28875 multiplied by a fraction of which the numerator is the number of days in such period, and of which the denominator is 90), subject to adjustment in accordance with Sections 6.6 and 6.9.

“ General Partner ” means Magellan GP, LLC (formerly known as WEG GP LLC), a Delaware limited liability company, as the successor to the Predecessor General Partner, and its successors and permitted assigns as general partner of the Partnership.

“ General Partner Interest ” means the ownership interest of the General Partner in the Partnership (in its capacity as a general partner without reference to any Limited Partner Interest held by it) which may be evidenced by Partnership Securities or a combination thereof or interest therein, and includes any and all benefits to which the General Partner is entitled as provided in this Agreement, together with all obligations of the General Partner to comply with the terms and provisions of this Agreement.

“ GP Reorganization Agreement ” means the Reorganization Agreement, dated as of March 4, 2002, among the Partnership, Magellan OLP, the Predecessor General Partner and the Operating General Partner.

“ GP Transfer Agreement ” means the Assignment, Assumption and Amendment Agreement, dated as of November 15, 2002, among the General Partner, the Predecessor General Partner, Williams Energy Services, LLC, Williams Natural Gas Liquids, Inc. and the Partnership.

“ Group ” means a Person that with or through any of its Affiliates or Associates has any agreement, arrangement or understanding for the purpose of acquiring, holding, voting (except voting pursuant to a revocable proxy or consent given to such Person in response to a proxy or consent solicitation made to 10 or more Persons) or disposing of any Partnership Securities with any other Person that beneficially owns, or whose Affiliates or Associates beneficially own, directly or indirectly, Partnership Securities.

“ Group Member ” means a member of the Partnership Group.

“ Holder ” as used in Section 7.12, has the meaning assigned to such term in Section 7.12(a).

“Holdings” means Magellan Midstream Holdings, L.P. (formerly known as WEG Acquisitions, L.P.), a Delaware limited partnership.

“ Incentive Distribution Right ” means a non-voting Limited Partner Interest originally issued to the Predecessor General Partner in connection with the transfer of substantially all of its general partner interest in Magellan Ammonia Pipeline, L.P. (formerly known as Williams Ammonia Pipeline, L.P.) and Magellan Terminals Holdings, L.P. (formerly known as Williams Terminals Holdings, L.P.) to the Partnership pursuant to Section 5.2 and subsequently transferred to the General Partner pursuant to the GP Transfer Agreement, which Partnership Interest confers upon the holder thereof only the rights and obligations specifically provided in this Agreement with respect to Incentive Distribution Rights (and no other rights otherwise available to or other obligations of a holder of a Partnership interest). Notwithstanding anything in this Agreement to the contrary, the holder of an Incentive Distribution Right shall not be entitled to vote such Incentive Distribution Right on any Partnership matter except as may otherwise be required by law.

“ Incentive Distributions ” means any amount of cash distributed to the holders of the Incentive Distribution Rights pursuant to Sections 6.4(a)(v), (vi) and (vii) and 6.4(b)(iii), (iv) and (v).

“ Indemnified Persons ” has the meaning assigned to such term in Section 7.12(c).

“ Indemnitee ” means (a) the General Partner, (b) any Departing Partner, (c) any Person who is or was an Affiliate of the General Partner or any Departing Partner, (d) any Person who is or was a member, partner, officer, director, employee, agent or trustee of any Group Member, the General Partner or any Departing Partner or any Affiliate of any Group Member, the General Partner or any Departing Partner, and (e) any Person who is or was serving at the request of the General Partner or any Departing Partner or any Affiliate of the General Partner or any Departing Partner as an officer, director, employee, member, partner, agent, fiduciary or trustee of another Person; provided, that a Person shall not be an Indemnitee by reason of providing, on a fee-for-services basis, trustee, fiduciary or custodial services.

“ Initial Common Units ” means the Common Units sold in the Initial Offering.

“ Initial Limited Partners ” means the Predecessor General Partner (with respect to the Incentive Distribution Rights received by it pursuant to Section 5.2), Williams Natural Gas Liquids, Inc., Williams Energy Services, LLC and the Underwriters, in each case upon being admitted to the Partnership in accordance with Section 10.1.

“ Initial Offering ” means the initial offering and sale of Common Units to the public, as described in the Registration Statement.

“ Initial Unit Price ” means (a) with respect to the Common Units and the Subordinated Units, the initial public offering price per Common Unit at which the Underwriters offered the Common Units to the public for sale as set forth on the cover page of the prospectus included as part of the Registration Statement and first issued at or after the time the Registration Statement first became effective or (b) with respect to any other class or series of Units, the price per Unit at which such class or series of Units is initially sold by the Partnership, as determined by the General Partner, in each case adjusted as the General Partner determines to be appropriate to give effect to any distribution, subdivision or combination of Units.

“ Interim Capital Transactions ” means the following transactions if they occur prior to the Liquidation Date: (a) borrowings, refinancings or refundings of indebtedness and sales of debt securities (other than Working Capital Borrowings and other than for items purchased on open account in the ordinary course of business) by any Group Member; (b) sales of equity interests by any Group Member (other than the Common Units sold to the Underwriters pursuant to the exercise of their over-allotment option); and (c) sales or other voluntary or involuntary dispositions of any assets of any Group Member other than (i) sales or other dispositions of inventory, accounts receivable and other assets in the ordinary course of business, and (ii) sales or other dispositions of assets as part of normal retirements or replacements.

“ Issue Price ” means the price at which a Unit is purchased from the Partnership, after taking into account any sales commission or underwriting discount charged to the Partnership.

“ Limited Partner ” means, unless the context otherwise requires, (a) the Organizational Limited Partner prior to its withdrawal from the Partnership, each Initial Limited Partner, each Substituted Limited Partner, each Additional Limited Partner and any Partner upon the change of its status from General Partner to Limited Partner pursuant to Section 11.3 or (b) solely for purposes of Articles V, VI, VII and IX, each Assignee; provided, however, that when the term “ Limited Partner ” is used herein in the context of any vote or other approval, including without limitation Articles XIII and XIV, such term shall not, solely for such purpose, include any holder of an Incentive Distribution Right except as may otherwise be required by law.

“ Limited Partner Interest ” means the ownership interest of a Limited Partner or Assignee in the Partnership, which may be evidenced by Common Units, Subordinated Units, Incentive Distribution Rights or other Partnership Securities or a combination thereof or interest therein, and includes any and all benefits to which such Limited Partner or Assignee is entitled as provided in this Agreement, together with all obligations of such Limited Partner or Assignee to comply with the terms and provisions of this Agreement; provided, however, that when the term “ Limited Partner Interest ” is used herein in the context of any vote or other approval, including without limitation Articles XIII and XIV, such term shall not, solely for such purpose, include any holder of an Incentive Distribution Right except as may otherwise be required by law.

“ Liquidation Date ” means (a) in the case of an event giving rise to the dissolution of the Partnership of the type described in clauses (a) and (b) of the first sentence of Section 12.2, the date on which the applicable time period during which the holders of Outstanding Units have the right to elect to reconstitute the Partnership and continue its business has expired without such an election being made, and (b) in the case of any other event giving rise to the dissolution of the Partnership, the date on which such event occurs.

“ Liquidator ” means one or more Persons selected by the General Partner to perform the functions described in Section 12.3 as liquidating trustee of the Partnership within the meaning of the Delaware Act.

“ Magellan OLP ” means Magellan OLP, L.P. (formerly known as Williams OLP, L.P.), a Delaware limited partnership.

“ Magellan Pipeline ” means Magellan Pipeline Company, LLC (formerly known as Williams Pipe Line Company, LLC), a Delaware limited liability company.

“ Merger Agreement ” has the meaning assigned to such term in Section 14.1.

“ Minimum Quarterly Distribution ” means $0.2625 per Unit per Quarter (or with respect to the period commencing on the Closing Date and ending on March 31, 2001, it means the product of $0.2625 multiplied by a fraction of which the numerator is the number of days in such period and of which the denominator is 90), subject to adjustment in accordance with Sections 6.6 and 6.9.

“ National Securities Exchange ” means an exchange registered with the Commission under Section 6(a) of the Securities Exchange Act of 1934, as amended, supplemented or restated from time to time, and any successor to such statute, or the Nasdaq National Market or any successor thereto.

“ Net Agreed Value ” means, (a) in the case of any Contributed Property, the Agreed Value of such property reduced by any liabilities either assumed by the Partnership upon such contribution or to which such property is subject when contributed, and (b) in the case of any property distributed to a Partner or Assignee by the Partnership, the Partnership’s Carrying Value of such property (as adjusted pursuant to Section 5.5(d)(ii)) at the time such property is distributed, reduced by any indebtedness either assumed by such Partner or Assignee upon such distribution or to which such property is subject at the time of distribution, in either case, as determined under Section 752 of the Code.

“ Net Income ” means, for any taxable year, the excess, if any, of the Partnership’s items of income and gain (other than those items taken into account in the computation of Net Termination Gain or Net Termination Loss) for such taxable year over the Partnership’s items of loss and deduction (other than those items taken into account in the computation of Net Termination Gain or Net Termination Loss) for such taxable year. The items included in the calculation of Net Income shall be determined in accordance with Section 5.5(b) and shall not include any items specially allocated under Section 6.1(d); provided that the determination of the items that have been specially allocated under Section 6.1(d) shall be made as if Section 6.1(d)(xii) were not in this Agreement.

“ Net Loss ” means, for any taxable year, the excess, if any, of the Partnership’s items of loss and deduction (other than those items taken into account in the computation of Net Termination Gain or Net Termination Loss) for such taxable year over the Partnership’s items of income and gain (other than those items taken into account in the computation of Net Termination Gain or Net Termination Loss) for such taxable year. The items included in the calculation of Net Loss shall be determined in accordance with Section 5.5(b) and shall not include any items specially allocated under Section 6.1(d); provided that the determination of the items that have been specially allocated under Section 6.1(d) shall be made as if Section 6.1(d)(xii) were not in this Agreement.

“ Net Positive Adjustments ” means, with respect to any Partner, the excess, if any, of the total positive adjustments over the total negative adjustments made to the Capital Account of such Partner pursuant to Book-Up Events and Book-Down Events.

“ Net Termination Gain ” means, for any taxable year, the sum, if positive, of all items of income, gain, loss or deduction recognized by the Partnership after the Liquidation Date. The items included in the determination of Net Termination Gain shall be determined in accordance with Section 5.5(b) and shall not include any items of income, gain or loss specially allocated under Section 6.1(d).

“ Net Termination Loss ” means, for any taxable year, the sum, if negative, of all items of income, gain, loss or deduction recognized by the Partnership after the Liquidation Date. The items included in the determination of Net Termination Loss shall be determined in accordance with Section 5.5(b) and shall not include any items of income, gain or loss specially allocated under Section 6.1(d).

“New Omnibus Agreement ” means that New Omnibus Agreement, dated as of June 17, 2003, among Holdings, Williams Energy Services, LLC, Williams Natural Gas Liquids, Inc., and The Williams Companies, Inc., as such agreement may be amended, supplemented or restated from time to time.

“New Services Agreement ” means that New Services Agreement, dated as of June 17, 2003, among the General Partner, the Partnership and Holdings, as such agreement may be amended, supplemented or restated from time to time.

“ Non-citizen Assignee ” means a Person whom the General Partner has determined in its discretion does not constitute an Eligible Citizen and as to whose Partnership Interest the General Partner has become the Substituted Limited Partner, pursuant to Section 4.9.

“ Nonrecourse Built-in Gain ” means with respect to any Contributed Properties or Adjusted Properties that are subject to a mortgage or pledge securing a Nonrecourse Liability, the amount of any taxable gain that would be allocated to the Partners pursuant to Sections 6.2(b)(i)(A), 6.2(b)(ii)(A) and 6.2(b)(iii) if such properties were disposed of in a taxable transaction in full satisfaction of such liabilities and for no other consideration.

“ Nonrecourse Deductions ” means any and all items of loss, deduction or expenditures (including, without limitation, any expenditures described in Section 705(a)(2)(B) of the Code) that, in accordance with the principles of Treasury Regulation Section 1.704-2(b), are attributable to a Nonrecourse Liability.

“ Nonrecourse Liability ” has the meaning set forth in Treasury Regulation Section 1.752-1(a)(2).

“ Notice of Election to Purchase ” has the meaning assigned to such term in Section 15.1(b).

“ Operating Expenditures ” means all Partnership Group expenditures, including, but not limited to, taxes, reimbursements of the General Partner, repayment of Working Capital Borrowings, debt service payments, and capital expenditures, subject to the following:

(a) Payments (including prepayments) of principal of and premium on indebtedness other than Working Capital Borrowings shall not constitute Operating Expenditures.

(b) Operating Expenditures shall not include (i) capital expenditures made for Acquisitions or for Capital Improvements, (ii) payment of transaction expenses relating to Interim Capital Transactions or (iii) distributions to Partners. Where capital expenditures are made in part for Acquisitions or for Capital Improvements and in part for other purposes, the General Partner’s good faith allocation between the amounts paid for each shall be conclusive.

“ Operating General Partner ” means Magellan GP, Inc. (formerly known as Williams GP Inc.), a Delaware corporation and wholly owned subsidiary of the Partnership, and any successors and permitted assigns as the general partner of Magellan OLP.

“ Operating Partnerships ” means Magellan OLP, Magellan Pipeline and such other Persons that are treated as partnerships for federal income tax purposes that are majority-owned by the Partnership and controlled by the Partnership (whether by direct or indirect ownership of the general partner of such Person or otherwise) and established or acquired for the purpose of conducting the business of the Partnership.

“ Operating Partnership Agreements ” means the agreement of limited partnership of any Operating Partnership that is a limited partnership, and any limited liability company agreement of any Operating Partnership that is a limited liability company that is treated as a partnership for federal income tax purposes, as such may be amended, supplemented or restated from time to time.

“ Operating Surplus ” means, with respect to any period ending prior to the Liquidation Date, on a cumulative basis and without duplication,

(a) the sum of (i) $15 million plus all cash and cash equivalents of the Partnership Group on hand as of the close of business on the Closing Date, (ii) all cash receipts of the Partnership Group for the period beginning on the Closing Date and ending with the last day of such period, other than cash receipts from Interim Capital Transactions (except to the extent specified in Section 6.5) and (iii) all cash receipts of the Partnership Group after the end of such period but on or before the date of determination of Operating Surplus with respect to such period resulting from Working Capital Borrowings, less

(b) the sum of (i) Operating Expenditures for the period beginning on the Closing Date and ending with the last day of such period and (ii) the amount of cash reserves that is necessary or advisable in the reasonable discretion of the General Partner to provide funds for future Operating Expenditures; provided, however, that disbursements made (including contributions to a Group Member or disbursements on behalf of a Group Member) or cash reserves established, increased or reduced after the end of such period but on or before the date of determination of Available Cash with respect to such period shall be deemed to have been made, established, increased or reduced, for purposes of determining Operating Surplus, within such period if the General Partner so determines.

Notwithstanding the foregoing, “ Operating Surplus ” with respect to the Quarter in which the Liquidation Date occurs and any subsequent Quarter shall equal zero.

“ Opinion of Counsel ” means a written opinion of counsel (who may be regular counsel to the Partnership or the General Partner or any of its Affiliates) acceptable to the General Partner in its reasonable discretion.

“ Option Closing Date ” means the date or dates on which any Common Units are sold by the Partnership to the Underwriters upon exercise of the Over-Allotment Option.

“ Organizational Limited Partner ” means Williams Energy Services, LLC in its capacity as the organizational limited partner of the Partnership pursuant to this Agreement.

“ Outstanding ” means, with respect to Partnership Securities, all Partnership Securities that are issued by the Partnership and reflected as outstanding on the Partnership’s books and records as of the date of determination; provided, however, that if at any time any Person or Group (other than the General Partner or its Affiliates) beneficially owns 20% or more of any Outstanding Partnership Securities of any class then Outstanding, all Partnership Securities owned by such Person or Group shall not be voted on any matter and shall not be considered to be Outstanding when sending notices of a meeting, of Limited Partners to vote on any matter (unless otherwise required by law), calculating required votes, determining the presence of a quorum or for other similar purposes under this Agreement, except that Common Units so owned shall be considered to be Outstanding for purposes of Section 11.1(b)(iv) (such Common Units shall not, however, be treated as a separate class of Partnership Securities for purposes of this Agreement); provided, further, that the foregoing limitation shall not apply (i) to any Person or Group who acquired 20% or more of any Outstanding Partnership Securities of any class then Outstanding directly from the General Partner or its Affiliates or (ii) to any Person or Group who acquired 20% or more of any Outstanding Partnership Securities of any class then Outstanding directly or indirectly from a Person or Group described in clause (i) provided that the General Partner shall have notified such Person or Group in writing that such limitation shall not apply; and provided, further, that none of the Class B Common Units shall be deemed to be Outstanding for purposes of determining if any Class B Common Units are entitled to distributions of Available Cash unless such Class B Common Units shall have been reflected on the books of the Partnership as outstanding during such Quarter and on the Record Date for the determination of any distribution of Available Cash.

“ Over-Allotment Option ” means the over-allotment option granted to the Underwriters by the Partnership pursuant to the Underwriting Agreement.

“ Parity Units ” means Common Units and all other Units of any other class or series that have the right to participate (i) in distributions of Available Cash from Operating Surplus pursuant to each of subclauses (a)(i) and (a)(ii) of Section 6.4 in the same order of priority with respect to the participation of Common Units in such distributions or (ii) to participate in allocations of Net Termination Gain pursuant to Section 6.1(c)(i)(B) in the same order of priority with the Common Units. Units whose participation in such (i) distributions of Available Cash from Operating Surplus and (ii) allocations of Net Termination Gain are subordinate in order of priority to such distributions and allocations on Common Units shall not constitute Parity Units even if such Units are convertible under certain circumstances into Common Units or Parity Units.

“ Partner Nonrecourse Debt ” has the meaning set forth in Treasury Regulation Section 1.704-2(b)(4).

“ Partner Nonrecourse Debt Minimum Gain ” has the meaning set forth in Treasury Regulation Section 1.704-2(i)(2).

“ Partner Nonrecourse Deductions ” means any and all items of loss, deduction or expenditure (including, without limitation, any expenditure described in Section 705(a)(2)(B) of the Code) that, in accordance with the principles of Treasury Regulation Section 1.704-2(i), are attributable to a Partner Nonrecourse Debt.

“ Partners ” means the General Partner and the Limited Partners.

“ Partnership ” means Magellan Midstream Partners, L.P. (formerly known as Williams Energy Partners L.P.), a Delaware limited partnership, and any successors thereto.

“ Partnership Group ” means the Partnership, the Operating Partnerships and any Subsidiary of any such entity, including the Operating General Partner, treated as a single consolidated entity.

“ Partnership Interest ” means an interest in the Partnership, which shall include the General Partner Interest and Limited Partner Interests.

“ Partnership Minimum Gain ” means that amount determined in accordance with the principles of Treasury Regulation Section 1.704-2(d).

“ Partnership Security ” means any class or series of equity interest in the Partnership (but excluding any options, rights, warrants and appreciation rights relating to an equity interest in the Partnership), including without limitation, Common Units, Subordinated Units and Incentive Distribution Rights.

“ Percentage Interest ” means as of the date of such determination (a) as to the General Partner, 2% and (b) as to any Limited Partner or Assignee holding Units, the product of (i) 98% multiplied by (ii) the quotient of (x) the number of Units held by such Limited Partner or Assignee divided by (y) the total number of all Units then Outstanding; provided, however, that following any issuance of additional Units by the Partnership in accordance with Section 5.6 hereof, proper adjustment shall be made to the Percentage Interest represented by each Unit to reflect such issuance. The Percentage Interest with respect to an Incentive Distribution Right shall at all times be zero.

“ Person ” means an individual or a corporation, limited liability company, partnership, joint venture, trust, unincorporated organization, association, government agency or political subdivision thereof or other entity.

“ Per Unit Capital Amount ” means, as of any date of determination, the Capital Account, stated on a per Unit basis, underlying any Unit held by a Person other than the General Partner or any Affiliate of the General Partner who holds Units.

“ Predecessor General Partner ” means Williams GP LLC, in its capacity as the general partner of the Partnership prior to the transfer of the General Partner Interest to the General Partner pursuant to the GP Transfer Agreement.

“ Pro Rata ” means (a) when modifying Units or any class thereof, apportioned equally among all designated Units in accordance with their relative Percentage Interests, (b) when modifying Partners and Assignees, apportioned among all Partners and Assignees in accordance with their relative Percentage Interests and (c) when modifying holders of Incentive Distribution Rights, apportioned equally among all holders of Incentive Distribution Rights in accordance with the relative number of Incentive Distribution Rights held by each such holder.

“ Purchase Date ” means the date determined by the General Partner as the date for purchase of all Outstanding Units of a certain class (other than Units owned by the General Partner and its Affiliates) pursuant to Article XV.

“ Quarter ” means, unless the context requires otherwise, a fiscal quarter, or with respect to the first fiscal quarter after the Closing Date the portion of such fiscal quarter after the Closing Date, of the Partnership.

“ Recapture Income ” means any gain recognized by the Partnership (computed without regard to any adjustment required by Section 734 or Section 743 of the Code) upon the disposition of any property or asset of the Partnership, which gain is characterized as ordinary income because it represents the recapture of deductions previously taken with respect to such property or asset.

“ Record Date ” means the date established by the General Partner for determining (a) the identity of the Record Holders entitled to notice of, or to vote at, any meeting of Limited Partners or entitled to vote by ballot or give approval of Partnership action in writing without a meeting or entitled to exercise rights in respect of any lawful action of Limited Partners or (b) the identity of Record Holders entitled to receive any report or distribution or to participate in any offer.

“ Record Holder ” means the Person in whose name a Common Unit is registered on the books of the Transfer Agent as of the opening of business on a particular Business Day, or with respect to other Partnership Securities, the Person in whose name any such other Partnership Security is registered on the books which the General Partner has caused to be kept as of the opening of business on such Business Day.

“ Redeemable Interests ” means any Partnership Interests for which a redemption notice has been given, and has not been withdrawn, pursuant to Section 4.10.

“ Registration Statement ” means the Registration Statement on Form S-1 (Registration No. 333-48866) as it has been or as it may be amended or supplemented from time to time, filed by the Partnership with the Commission under the Securities Act to register the offering and sale of the Common Units in the Initial Offering.

“Remaining Basket Amount” has the meaning assigned to such term in Section 5.7(g).

“ Remaining Net Positive Adjustments ” means as of the end of any taxable period, (i) with respect to the Unitholders holding Common Units or Subordinated Units, the excess of (a) the Net Positive Adjustments of the Unitholders holding Common Units or Subordinated Units as of the end of such period over (b) the sum of those Partners’ Share of Additional Book Basis Derivative Items for each prior taxable period, (ii) with respect to the General Partner (as holder of the General Partner Interest), the excess of (a) the Net Positive Adjustments of the General Partner as of the end of such period over (b) the sum of the General Partner’s Share of Additional Book Basis Derivative Items with respect to the General Partner Interest for each prior taxable period, and (iii) with respect to the holders of Incentive Distribution Rights, the excess of (a) the Net Positive Adjustments of the holders of Incentive Distribution Rights as of the end of such period over (b) the sum of the Share of Additional Book Basis Derivative Items of the holders of the Incentive Distribution Rights for each prior taxable period.

“ Required Allocations ” means (a) any limitation imposed on any allocation of Net Losses or Net Termination Losses under Section 6.1(b) or 6.1(c)(ii) and (b) any allocation of an item of income, gain, loss or deduction pursuant to Section 6.1(d)(i), 6.1(d)(ii), 6.1(d)(iv), 6.1(d)(vii) or 6.1(d)(ix).

“ Residual Gain ” or “ Residual Loss ” means any item of gain or loss; as the case may be, of the Partnership recognized for federal income tax purposes resulting from a sale, exchange or other disposition of a Contributed Property or Adjusted Property, to the extent such item of gain or loss is not allocated pursuant to Section 6.2(b)(i)(A) or 6.2(b)(ii)(A), respectively, to eliminate Book-Tax Disparities.

“ Restricted Assets ” has the meaning set forth in the New Omnibus Agreement.

“ Second Liquidation Target Amount ” has the meaning assigned to such term in Section 6.1(c)(i)(E).

“ Second Target Distribution ” means $0.328125 per Unit per Quarter (or, with respect to the period commencing on the Closing Date and ending on March 31, 2001, it means the product of $0.328125 multiplied by a fraction of which the numerator is equal to the number of days in such period and of which the denominator is 90), subject to adjustment in accordance with Sections 6.6 and 6.9.

“ Securities Act ” means the Securities Act of 1933, as amended, supplemented or restated from time to time and any successor to such statute.

“ Share of Additional Book Basis Derivative Items ” means in connection with any allocation of Additional Book Basis Derivative Items for any taxable period, (i) with respect to the Unitholders holding Common Units or Subordinated Units, the amount that bears the same ratio to such Additional Book Basis Derivative Items as the Unitholders’ Remaining Net Positive Adjustments as of the end of such period bears to the Aggregate Remaining Net Positive Adjustments as of that time, (ii) with respect to the General Partner (as holder of the General Partner Interest), the amount that bears the same ratio to such additional Book Basis Derivative Items as the General Partner’s Remaining Net Positive Adjustments as of the end of such period bears to the Aggregate Remaining Net Positive Adjustment as of that time, and (iii) with respect to the Partners holding Incentive Distribution Rights, the amount that bears the same ratio to such Additional Book Basis Derivative Items as the Remaining Net Positive Adjustments of the Partners holding the Incentive Distribution Rights as of the end of such period bears to the Aggregate Remaining Net Positive Adjustments as of that time.

“ Special Approval ” means approval by a majority of the members of the Conflicts Committee.

“ Subordinated Unit ” means a Unit representing a fractional part of the Partnership Interests of all Limited Partners and Assignees (other than of holders of the Incentive Distribution Rights) and having the rights and obligations specified with respect to Subordinated Units in this Agreement. The term “ Subordinated Unit ” as used herein does not include a Common Unit or Parity Unit. A Subordinated Unit that is convertible into a Common Unit or a Parity Unit shall not constitute a Common Unit or Parity Unit until such conversion occurs.

“ Subordination Period ” means the period commencing on the Closing Date and ending on the first to occur of the following dates:

(a) the first day of any Quarter beginning after December 31, 2005 in respect of which (i) (A) distributions of Available Cash from Operating Surplus on each of the Outstanding Common Units and Subordinated Units with respect to each of the three consecutive, non-overlapping four-Quarter periods immediately preceding such date equaled or exceeded, the sum of the Minimum Quarterly Distribution (or portion thereof for the first fiscal quarter after the Closing Date) on all Outstanding Common Units and Subordinated Units during such periods and (B) the Adjusted Operating Surplus generated during each of the three consecutive, non-overlapping four-Quarter periods immediately preceding such date equaled or exceeded the sum of the Minimum Quarterly Distribution on all of the Common Units and Subordinated Units that were Outstanding during such periods on a fully diluted basis (i.e., taking into account for purposes of such determination all Outstanding Common Units, all Outstanding Subordinated Units, all Common Units and Subordinated Units issuable upon exercise of employee options that have, as of the date of determination, already vested or are scheduled to vest prior to the end of the Quarter immediately following the Quarter with respect to which such determination is made, and all Common Units and Subordinated Units that have as of the date of determination, been earned by but not yet issued to management of the Partnership in respect of incentive compensation), plus the related distribution on the General Partner Interest in the Partnership during such periods and (ii) there are no Cumulative Common Unit Arrearages; and

(b) the date on which the General Partner is removed as general partner of the Partnership upon the requisite vote by holders of Outstanding Units under circumstances where Cause does not exist and Units held by the General Partner and its Affiliates are not voted in favor of such removal.

Notwithstanding any of the provisions of clause (a) of this definition, no Class B Common Unit shall be deemed Outstanding in any Quarter if (1) such Class B Common Unit was issued after the end of such Quarter or (2) such Class B Common Unit has been redeemed by the Partnership prior to the Record Date for the determination of any distributions of Available Cash from Operating Surplus on the Class B Common Units for such Quarter.

“ Subsidiary ” means, with respect to any Person, (a) a corporation of which more than 50% of the voting power of shares entitled (without regard to the occurrence of any contingency) to vote in the election of directors or other governing body of such corporation is owned, directly or indirectly, at the date of determination, by such Person, by one or more Subsidiaries of such Person or a combination thereof, (b) a partnership (whether general or limited) in which such Person or a Subsidiary of such Person is, at the date of determination, a general or limited partner of such partnership, but only if more than 50% of the partnership interests of such partnership (considering all of the partnership interests of the partnership as a single class) is owned, directly or indirectly, at the date of determination, by such Person, by one or more Subsidiaries of such Person, or a combination thereof, or (c) any other Person (other than a corporation or a partnership) in which such Person, one or more Subsidiaries of such Person, or a combination thereof, directly or indirectly, at the date of determination, has (i) at least a majority ownership interest or (ii) the power to elect or direct the election of a majority of the directors or other governing body of such-Person.

“ Substituted Limited Partner ” means a Person who is admitted as a Limited Partner to the Partnership pursuant to Section 10.2 in place of and with all the rights of a Limited Partner and who is shown as a Limited Partner on the books and records of the Partnership.

“ Surviving Business Entity ” has the meaning assigned to such term in Section 14.2(b).

“ Third Target Distribution ” means $0.39375 per Unit per Quarter (or, with respect to the period commencing on the Closing Date and ending on March 31, 2001, it means the product of $0.39375 multiplied by a fraction of which the numerator is equal to the number of days in such period and of which the denominator is 90), subject to adjustment in accordance with Sections 6.6 and 6.9.

“Third Target Liquidation Amount” has the meaning assigned to such term in Section 6.1(c)(i)(F).

“ Trading Day ” has the meaning assigned to such term in Section 15.1(a).

“ Transfer ” has the meaning assigned to such term in Section 4.4(a).

“ Transfer Agent ” means such bank, trust company or other Person (including the General Partner or one of its Affiliates) as shall be appointed from time to time by the Partnership to act as registrar and transfer agent for the Common Units; provided that if no Transfer Agent is specifically designated for any other Partnership Securities, the General Partner shall act in such capacity.

“ Transfer Application ” means an application and agreement for transfer of Units in the form set forth on the back of a Certificate or in a form substantially to the same effect in a separate instrument.

“ Underwriter ” means each Person named as an underwriter in Schedule I to the Underwriting Agreement who purchases Common Units pursuant thereto.

“ Underwriting Agreement ” means the Underwriting Agreement dated February 5, 2001 among the Underwriters, the Partnership and certain other parties, providing for the purchase of Common Units by such Underwriters.

“ Unit ” means a Partnership Security that is designated as a “ Unit ” and shall include Common Units and Subordinated Units but shall not include (i) a General Partner Interest or (ii) Incentive Distribution Rights.

“ Unitholders ” means the holders of Common Units and Subordinated Units.

“Unit Majority” means during the Subordination Period, (a) at least a majority of the Outstanding Common Units, excluding Common Units held by the General Partner and any Affiliates of the General Partner, voting as a class and (b) at least a majority of the Outstanding

Common Units and the Outstanding Subordinated Units voting as a class; provided, however, that each Common Unit shall count as one Unit and have one vote and each Subordinated Unit shall count as .5 of a Unit and have .5 of a vote for the purpose of this clause (b), and for the purpose of determining a quorum under Section 13.9, each Outstanding Subordinated Unit shall be counted as .5 of an Outstanding Limited Partner Interest. After the Subordination Period has ended, “Unit Majority” means a majority of the Outstanding Common Units.

“Unit Split” has the meaning set forth in the recitals.

“ Unpaid MQD ” has the meaning assigned to such term in Section 6.1(c)(i)(B).

“ Unrealized Gain ” attributable to any item of Partnership property means, as of any date of determination, the excess, if any, of (a) the fair market value of such property as of such date (as determined under Section 5.5(d)) over (b) the Carrying Value of such property as of such date (prior to any adjustment to be made pursuant to Section 5.5(d) as of such date).

“ Unrealized Loss ” attributable to any item of Partnership property means, as of any date of determination, the excess, if any, of (a) the Carrying Value of such property as of such date (prior to any adjustment to be made pursuant to Section 5.5(d) as of such date) over (b) the fair market value of such property as of such date (as determined under Section 5.5(d)).

“ Unrecovered Capital ” means at any time, with respect to a Unit, the Initial Unit Price less the sum of all distributions constituting Capital Surplus theretofore made in respect of an Initial Common Unit and any distributions of cash (or the Net Agreed Value of any distributions in kind) in connection with the dissolution and liquidation of the Partnership theretofore made in respect of an Initial Common Unit, adjusted as the General Partner determines to be appropriate to give effect to any distribution, subdivision or combination of such Units.

“ US GAAP ” means United States Generally Accepted Accounting Principles consistently applied.

“ Withdrawal Opinion of Counsel ” has the meaning assigned to such term in Section 11.1(b).

“ Working Capital Borrowings ” means borrowings exclusively for working capital purposes made pursuant to a credit facility or other arrangement requiring all such borrowings thereunder to be reduced to a relatively small amount each year (or for the year in which the Initial Offering is consummated, the 12-month period beginning on the Closing Date) for an economically meaningful period of time.

Section 1.2. Construction.

Unless the context requires otherwise: (a) any pronoun used in this Agreement shall include the corresponding masculine, feminine or neuter forms, and the singular form of nouns, pronouns and verbs shall include the plural and vice versa; (b) references to Articles and Sections refer to Articles and Sections of this Agreement; and (c) the term “ include ” or “ includes ” means includes, without limitation, and “ including ” means including, without limitation.

ARTICLE II.

ORGANIZATION

Section 2.1. Formation.

The Predecessor General Partner and the Organizational Limited Partner have previously formed the Partnership as a limited partnership pursuant to the provisions of the Delaware Act. Except as expressly provided to the contrary in this Agreement, the rights, duties (including fiduciary duties), liabilities and obligations of the Partners and the administration, dissolution and termination of the Partnership shall be governed by the Delaware Act. All Partnership Interests shall constitute personal property of the owner thereof for all purposes and a Partner has no interest in specific Partnership property. The Unit Split was effectuated in accordance with Section 5.10 of this Agreement, and all related numerical amounts in this Agreement are presented as if the Unit Split had occurred as of the commencement of the term of the Partnership.

Section 2.2. Name.

The name of the Partnership shall be “Magellan Midstream Partners, L.P.” The Partnership’s business may be conducted under any other name or names deemed necessary or appropriate by the General Partner in its sole discretion, including the name of the General Partner. The words “Limited Partnership,” “Ltd.” or similar words or letters shall be included in the Partnership’s name where necessary for the purpose of complying with the laws of any jurisdiction that so requires. The General Partner in its discretion may change the name of the Partnership at any time and from time to time and shall notify the Limited Partners of such change in the next regular communication to the Limited Partners.

Section 2.3. Registered Office; Registered Agent; Principal Office; Other Offices.

Unless and until changed by the General Partner, the registered office of the Partnership in the State of Delaware shall be located at 1209 Orange Street, Wilmington, Delaware 19801, and the registered agent for service of process on the Partnership in the State of Delaware at such registered office shall be The Corporation Trust Company. The principal office of the Partnership shall be located at One Williams Center, Tulsa, Oklahoma 74172 or such other place as the General Partner may from time to time designate by notice to the Limited Partners. The Partnership may maintain offices at such other place or places within or outside the State of Delaware as the General Partner deems necessary or appropriate. The address of the General Partner shall be One Williams Center, Tulsa Oklahoma 74172 or such other place as the General Partner may from time to time designate by notice to the Limited Partners.

Section 2.4. Purpose and Business.

The purpose and nature of the business to be conducted by the Partnership shall be to (a) serve as a partner of Magellan OLP and, in connection therewith, to exercise all the rights and powers conferred upon, the Partnership as a partner of Magellan OLP pursuant to the Operating Partnership Agreement of Magellan OLP or otherwise, (b) serve as the sole stockholder of the Operating General Partner and, in connection therewith, to exercise on behalf of the Partnership all the rights and powers held by the Partnership as the sole stockholder of the Operating General

Partner, (c) serve as the sole member of Magellan Pipeline and in connection therewith to exercise on behalf of the Partnership all the rights and powers held by the Partnership as the sole member of Magellan Pipeline, pursuant to the Operating Partnership Agreement of Magellan Pipeline or otherwise, (d) engage directly in, or enter into or form any corporation, partnership, joint venture, limited liability company or other arrangement to engage indirectly in, any business activity that the Operating Partnerships are permitted to engage in by the Operating Partnership Agreements and, in connection therewith, to exercise all of the rights and powers conferred upon the Partnership pursuant to the agreements relating to such business activity, (e) engage directly in, or enter into or form any corporation, partnership, joint venture, limited liability company or other entity or arrangement to engage indirectly in, any business activity that the General Partner approves and which lawfully may be conducted by a limited partnership organized pursuant to the Delaware Act and, in connection therewith, to exercise all of the rights and powers conferred upon the Partnership pursuant to the agreements relating to such business activity and (f) do anything necessary or appropriate to the foregoing, including the making of capital contributions or loans to a Group Member; provided, however, that the General Partner shall not cause the Partnership to engage, directly or indirectly, in any business activity that the General Partner reasonably determines would cause the Partnership to be treated as an association taxable as a corporation or otherwise taxable as an entity for federal income tax purposes. The General Partner has no obligation or duty to the Partnership, the Limited Partners or the Assignees to propose or approve, and in its discretion may decline to propose or approve, the conduct by the Partnership of any business.

Section 2.5. Powers.

The Partnership shall be empowered to do any and all acts and things necessary, appropriate, proper, advisable, incidental to or convenient for the furtherance and accomplishment of the purposes and business described in Section 2.4 and for the protection and benefit of the Partnership.

Section 2.6. Power of Attorney.

(a) Each Limited Partner and each Assignee hereby constitutes and appoints the General Partner and, if a Liquidator shall have been selected pursuant to Section 12.3, the Liquidator, (and any successor to the Liquidator by merger, transfer, assignment, election or otherwise) and each of their authorized officers and attorneys-in-fact, as the case may be, with full power of substitution, as his true and lawful agent and attorney-in-fact, with full power and authority in his name, place and stead, to:

(i) execute, swear to, acknowledge, deliver, file and record in the appropriate public offices (A) all certificates, documents and other instruments (including this Agreement and the Certificate of Limited Partnership and all amendments or restatements hereof or thereof) that the General Partner or the Liquidator deems necessary or appropriate to form, qualify or continue the existence or qualification of the Partnership as a limited partnership (or a partnership in which the limited partners have limited liability) in the State of Delaware and in all other jurisdictions in which the Partnership may conduct business or own property; (B) all certificates, documents and other instruments that the General Partner or the Liquidator deems necessary or appropriate to

reflect, in accordance with its terms, any amendment, change, modification or restatement of this Agreement; (C) all certificates, documents and other instruments (including conveyances and a certificate of cancellation) that the General Partner or the Liquidator deems necessary or appropriate to reflect the dissolution and liquidation of the Partnership pursuant to the terms of this Agreement; (D) all certificates, documents and other instruments relating to the admission, withdrawal, removal or substitution of any Partner pursuant to, or other events described in, Article IV, X, XI or XII; (E) all certificates, documents and other instruments relating to the determination of the rights, preferences and privileges of any class or series of Partnership Securities issued pursuant to Section 5.6; and (F) all certificates, documents and other instruments (including agreements and a certificate of merger) relating to a merger or consolidation of the Partnership pursuant to Article XIV; and

(ii) execute, swear to, acknowledge, deliver, file and record all ballots, consents, approvals, waivers, certificates, documents and other instruments necessary or appropriate, in the discretion of the General Partner or the Liquidator, to make, evidence, give, confirm or ratify any vote, consent, approval, agreement or other action that is made or given by the Partners hereunder or is consistent with the terms of this Agreement or is necessary or appropriate, in the discretion of the General Partner or the Liquidator, to effectuate the terms or intent of this Agreement; provided, that when required by Section 13.3 or any other provision of this Agreement that establishes a percentage of the Limited Partners or of the Limited Partners of any class or series required to take any action, the General Partner and the Liquidator may exercise the power of attorney made in this Section 2.6(a)(ii) only after the necessary vote, consent or approval of the Limited Partners or of the Limited Partners of such class or series, as applicable.

Nothing contained in this Section 2.6(a) shall be construed as authorizing the General Partner to amend this Agreement except in accordance with Article XIII or as may be otherwise expressly provided for in this Agreement.

(b) The foregoing power of attorney is hereby declared to be irrevocable and a power coupled with an interest, and it shall survive and, to the maximum extent permitted by law, not be affected by the subsequent death, incompetency, disability, incapacity, dissolution, bankruptcy or termination of any Limited Partner or Assignee and the transfer of all or any portion of such Limited Partner’s or Assignee’s Partnership Interest and shall extend to such Limited Partner’s or Assignee’s heirs, successors, assigns and personal representatives. Each such Limited Partner or Assignee hereby agrees to be bound by any representation made by the General Partner or the Liquidator acting in good faith pursuant to such power of attorney; and each such Limited Partner or Assignee, to the maximum extent permitted by law, hereby waives any and all defenses that may be available to contest, negate or disaffirm the action of the General Partner or the Liquidator taken in good faith under such power of attorney. Each Limited Partner or Assignee shall execute and deliver to the General Partner or the Liquidator, within 15 days after receipt of the request therefor, such further designation, powers of attorney and other instruments as the General Partner or the Liquidator deems necessary to effectuate this Agreement and the purposes of the Partnership.

Section 2.7. Term.

The term of the Partnership commenced upon the filing of the Certificate of Limited Partnership in accordance with the Delaware Act and shall continue in existence until the dissolution of the Partnership in accordance with the provisions of Article XII. The existence of the Partnership as a separate legal entity shall continue until the cancellation of the Certificate of Limited Partnership as provided in the Delaware Act.

Section 2.8. Title to Partnership Assets.

Title to Partnership assets, whether real, personal or mixed and whether tangible or intangible, shall be deemed to be owned by the Partnership as an entity, and no Partner or Assignee, individually or collectively, shall have any ownership interest in such Partnership assets or any portion thereof. Title to any or all of the Partnership assets may be held in the name of the Partnership, the General Partner, one or more of its Affiliates or one or more nominees, as the General Partner may determine. The General Partner hereby declares and warrants that any Partnership assets for which record title is held in the name of the General Partner or one or more of its Affiliates or one or more nominees shall be held by the General Partner or such Affiliate or nominee for the use and benefit of the Partnership in accordance with the provisions of this Agreement; provided, however, that the General Partner shall use reasonable efforts to cause record title to such assets (other than those assets in respect of which the General Partner determines that the expense and difficulty of conveyancing makes transfer of record title to the Partnership impracticable) to be vested in the Partnership as soon as reasonably practicable; provided, further, that, prior to the withdrawal or removal of the General Partner or as soon thereafter as practicable, the General Partner shall use reasonable efforts to effect the transfer of record title to the Partnership and, prior to any such transfer, will provide for the use of such assets in a manner satisfactory to the General Partner. All Partnership assets shall be recorded as the property of the Partnership in its books and records, irrespective of the name in which record title to such Partnership assets is held.

Section 2.9. Certain Undertakings Relating to the Separateness of the Partnership.

(a) Separate Records . The Partnership shall maintain (i) its books and records, (ii) its accounts, and (iii) its financial statements, separate from those of any other Person, except its consolidated Subsidiaries.

(b) Separate Assets . The Partnership shall not commingle or pool its funds or other assets with those of any other Person, except its consolidated Subsidiaries, and shall maintain its assets in a manner that is not costly or difficult to segregate, ascertain or otherwise identify as separate from those of any other Person.

(c) Separate Name . The Partnership shall (i) conduct its business in its own name, (ii) use separate stationery, invoices, and checks, (iii) correct any known misunderstanding regarding its separate identity, and (iv) generally hold itself out as a separate entity.

(d) Separate Credit . The Partnership shall not (i) pay its own liabilities from a source other than its own funds, (ii) guarantee or become obligated for the debts of any

other Person, except its Subsidiaries, (iii) hold out its credit as being available to satisfy the obligations of any other Person, except its Subsidiaries, (iv) acquire obligations or debt securities of Holdings its Affiliates (other than the Partnership or its Subsidiaries), or (v) pledge its assets for the benefit of any Person or make loans or advances to any Person, except its Subsidiaries; provided that the Partnership may engage in any transaction described in clauses (ii)-(v) of this Section 2.9(d) if prior Special Approval has been obtained for such transaction and either (A) the Conflicts Committee has determined, or has obtained reasonable written assurance from a nationally recognized firm of independent public accountants or a nationally recognized investment banking or valuation firm, that the borrower or recipient of the credit extension is not then insolvent and will not be rendered insolvent as a result of such transaction or (B) in the case of transactions described in clause (iv), such transaction is completed through a public auction or a National Securities Exchange.

(e) Separate Formalities . The Partnership shall (i) observe all partnership formalities and other formalities required by its organizational documents, the laws of the jurisdiction of its formation, or other laws, rules, regulations and orders of governmental authorities exercising jurisdiction over it, (ii) engage in transactions with the General Partner and its Affiliates (other than another Group Member) in conformity with the requirements of Section 7.9, and (iii) subject to the terms of the New Omnibus Agreement and the New Services Agreement, promptly pay, from its own funds, and on a current basis, its allocable share of general and administrative expenses, capital expenditures, and costs for shared services performed by Affiliates of the General Partner (other than another Group Member). Each material contract between the Partnership or another Group Member, on the one hand, and the Affiliates of the General Partner (other than a Group Member), on the other hand, shall be in writing.

ARTICLE III.

RIGHTS OF LIMITED PARTNERS

Section 3.1. Limitation of Liability.

The Limited Partners and the Assignees shall have no liability under this Agreement except as expressly provided in this Agreement or the Delaware Act.

Section 3.2. Management of Business.

No Limited Partner or Assignee, in its capacity as such, shall participate in the operation, management or control (within the meaning of the Delaware Act) of the Partnership’s business, transact any business in the Partnership’s name or have the power to sign documents for or otherwise bind the Partnership. Any action taken by any Affiliate of the General Partner or any officer, director, employee, manager, member, general partner, agent or trustee of the General Partner or any of its Affiliates, or any officer, director, employee, manager, member, general partner, agent or trustee of a Group Member, in its capacity as such, shall not be deemed to be participation in the control of the business of the Partnership by a limited partner of the Partnership (within the meaning of Section 17-303(a) of the Delaware Act) and shall not affect, impair or eliminate the limitations on the liability of the Limited Partners or Assignees under this Agreement.

Section 3.3. Outside Activities of the Limited Partners.

Subject to the provisions of Section 7.5 and Article III of the New Omnibus Agreement, which shall continue to be applicable to the Persons referred to therein, regardless of whether such Persons shall also be Limited Partners or Assignees, any Limited Partner or Assignee shall be entitled to and may have business interests and engage in business activities in addition to those relating to the Partnership, including business interests and activities in direct competition with the Partnership Group. Neither the Partnership nor any of the other Partners or Assignees shall have any rights by virtue of this Agreement in any business ventures of any Limited Partner or Assignee.

Section 3.4. Rights of Limited Partners.

(a) In addition to other rights provided by this Agreement or by applicable law, and except as limited by Section 3.4(b), each Limited Partner shall have the right, for a purpose reasonably related to such Limited Partner’s interest as a limited partner in the Partnership, upon reasonable written demand and at such Limited Partner’s own expense:

(i) to obtain true and full information regarding the status of the business and financial condition of the Partnership;

(ii) promptly after becoming available, to obtain a copy of the Partnership’s federal, state and local income tax returns for each year;

(iii) to have furnished to him a current list of the name and last known business, residence or mailing address of each Partner;

(iv) to have furnished to him a copy of this Agreement and the Certificate of Limited Partnership and all amendments thereto, together with a copy of the executed copies of all powers of attorney pursuant to which this Agreement, the Certificate of Limited Partnership and all amendments thereto have been executed;

(v) to obtain true and full information regarding the amount of cash and a description and statement of the Net Agreed Value of any other Capital Contribution by each Partner and which each Partner has agreed to contribute in the future, and the date on which each became a Partner; and

(vi) to obtain such other information regarding the affairs of the Partnership as is just and reasonable.

(b) The General Partner may keep confidential from the Limited Partners and Assignees, for such period of time as the General Partner deems reasonable, (i) any information that the General Partner reasonably believes to be in the nature of trade secrets or (ii) other information the disclosure of which the General Partner in good faith believes (A) is not in the best interests of the Partnership Group, (B) could damage the Partnership Group or (C) that any

Group Member is required by law or by agreement with any third party to keep confidential (other than agreements with Affiliates of the Partnership the primary purpose of which is to circumvent the obligations set forth in this Section 3.4).

ARTICLE IV.

CERTIFICATES; RECORD HOLDERS; TRANSFER OF PARTNERSHIP INTERESTS;

REDEMPTION OF PARTNERSHIP INTERESTS

Section 4.1. Certificates.

Upon the Partnership’s issuance of Common Units or Subordinated Units to any Person, the Partnership shall issue one or more Certificates in the name of such Person evidencing the number of such Units being so issued. In addition, (a) upon the General Partner’s request, the Partnership shall issue to it one or more Certificates in the name of the General Partner evidencing its interests in the Partnership and (b) upon the request of any Person owning Incentive Distribution Rights or any other Partnership Securities other than Common Units or Subordinated Units, the Partnership shall issue to such Person one or more Certificates evidencing such Incentive Distribution Rights or other Partnership Securities other than Common Units or Subordinated Units. Certificates shall be executed on behalf of the Partnership by the Chairman of the Board, President or any Vice President and the Secretary or any Assistant Secretary of the General Partner. No Common Unit Certificate shall be valid for any purpose until it has been countersigned by the Transfer Agent; provided, however, that if the General Partner elects to issue Common Units in global form, the Common Unit Certificates shall be valid upon receipt of a certificate from the Transfer Agent certifying that the Common Units have been duly registered in accordance with the directions of the Partnership and the Underwriters. Subject to the requirements of Section 6.7(b), the Partners holding Certificates evidencing Subordinated Units may exchange such Certificates for Certificates evidencing Common Units on or after the date on which such Subordinated Units are converted into Common Units pursuant to the terms of Section 5.8.

Section 4.2. Mutilated, Destroyed, Lost or Stolen Certificates.

(a) If any mutilated Certificate is surrendered to the Transfer Agent, the appropriate officers of the General Partner on behalf of the Partnership shall execute, and the Transfer Agent shall countersign and deliver in exchange therefor, a new Certificate evidencing the same number and type of Partnership Securities as the Certificate so surrendered.

(b) The appropriate officers of the General Partner on behalf of the Partnership shall execute and deliver, and the Transfer Agent shall countersign a new Certificate in place of any Certificate previously issued if the Record Holder of the Certificate:

(i) makes proof by affidavit, in form and substance satisfactory to the Partnership, that a previously issued Certificate has been lost, destroyed or stolen;

(ii) requests the issuance of a new Certificate before the Partnership has notice that the Certificate has been acquired by a purchaser for value in good faith and without notice of an adverse claim;

(iii) if requested by the Partnership, delivers to the Partnership a bond, in form and substance satisfactory to the Partnership, with surety or sureties and with fixed or open penalty as the Partnership may reasonably direct, in its sole discretion, to indemnify the Partnership, the Partners, the General Partner and the Transfer Agent against any claim that may be made on account of the alleged loss, destruction or theft of the Certificate; and

(iv) satisfies any other reasonable requirements imposed by the Partnership.

If a Limited Partner or Assignee fails to notify the Partnership within a reasonable time after he has notice of the loss, destruction or theft of a Certificate, and a transfer of the Limited Partner Interests represented by the Certificate is registered before the Partnership, the General Partner or the Transfer Agent receives such notification, the Limited Partner or Assignee shall be precluded from making any claim against the Partnership, the General Partner or the Transfer Agent for such transfer or for a new Certificate.

(c) As a condition to the issuance of any new Certificate under this Section 4.2, the Partnership may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses (including the fees and expenses of the Transfer Agent) reasonably connected therewith.

Section 4.3. Record Holders.

The Partnership shall be entitled to recognize the Record Holder as the Partner or Assignee with respect to any Partnership Interest and, accordingly, shall not be bound to recognize any equitable or other claim to or interest in such Partnership Interest on the part of any other Person, regardless of whether the Partnership shall have actual or other notice thereof, except as otherwise provided by law or any applicable rule, regulation, guideline or requirement of any National Securities Exchange on which such Partnership Interests are listed for trading. Without limiting the foregoing, when a Person (such as a broker, dealer, bank, trust company or clearing corporation or an agent of any of the foregoing) is acting as nominee, agent or in some other representative capacity for another Person in acquiring and/or holding Partnership Interests, as between the Partnership on the one hand, and such other Persons on the other, such representative Person (a) shall be the Partner or Assignee (as the case may be) of record and beneficially, (b) must execute and deliver a Transfer Application and (c) shall be bound by this Agreement and shall have the rights and obligations of a Partner or Assignee (as the case may be) hereunder and as, and to the extent, provided for herein.

Section 4.4. Transfer Generally.

(a) The term “ transfer ,” when used in this Agreement with respect to a Partnership Interest, shall be deemed to refer to a transaction by which the General Partner assigns its General Partner Interest to another Person who becomes the General Partner, by which the holder of a Limited Partner Interest assigns such Limited Partner Interest to another Person who is or becomes a Limited Partner or an Assignee, and includes a sale, assignment, gift, pledge, encumbrance, hypothecation, mortgage, exchange or any other disposition by law or otherwise.

(b) No Partnership Interest shall be transferred, in whole or in part, except in accordance with the terms and conditions set forth in this Article IV. Any transfer or purported transfer of a Partnership Interest not made in accordance with this Article IV shall be null and void.

(c) Nothing contained in this Agreement shall be construed to prevent a disposition by any member of the General Partner of any or all of the issued and outstanding membership interests of the General Partner.

Section 4.5. Registration and Transfer of Limited Partner Interests.

(a) The Partnership shall keep or cause to be kept on behalf of the Partnership a register in which, subject to such reasonable regulations as it may prescribe and subject to the provisions of Section 4.5(b), the Partnership will provide for the registration and transfer of Limited Partner Interests. The Transfer Agent is hereby appointed registrar and transfer agent for the purpose of registering Common Units and transfers of such Common Units as herein provided. The Partnership shall not recognize transfers of Certificates evidencing Limited Partner Interests unless such transfers are effected in the manner described in this Section 4.5. Upon surrender of a Certificate for registration of transfer of any Limited Partner Interests evidenced by a Certificate, and subject to the provisions of Section 4.5(b), the appropriate officers of the General Partner on behalf of the Partnership shall execute and deliver, and in the case of Common Units, the Transfer Agent shall countersign and deliver, in the name of the holder or the designated transferee or transferees, as required pursuant to the holder’s instructions, one or more new Certificates evidencing the same aggregate number and type of Limited Partner Interests as was evidenced by the Certificate so surrendered.

(b) Except as otherwise provided in Section 4.9, the Partnership shall not recognize any transfer of Limited Partner Interests until the Certificates evidencing such Limited Partner Interests are surrendered for registration of transfer and such Certificates are accompanied by a Transfer Application duly executed by the transferee (or the transferee’s attorney-in-fact duly authorized in writing). No charge shall be imposed by the Partnership for such transfer; provided, that as a condition to the issuance of any new Certificate under this Section 4.5, the Partnership may require the payment of a sum sufficient to cover any tax or other governmental charge that may be imposed with respect thereto.

(c) Limited Partner Interests may be transferred only in the manner described in this Section 4.5. The transfer of any Limited Partner Interests and the admission of any new Limited Partner shall not constitute an amendment to this Agreement.

(d) Until admitted as a Substituted Limited Partner pursuant to Section 10.2, the Record Holder of a Limited Partner Interest shall be an Assignee in respect of such Limited Partner Interest. Limited Partners may include custodians, nominees or any other individual or entity in its own or any representative capacity.

(e) A transferee of a Limited Partner Interest who has completed and delivered a Transfer Application shall be deemed to have (i) requested admission as a Substituted Limited Partner, (ii) agreed to comply with and be bound by and to have executed this Agreement,

(iii) represented and warranted that such transferee has the right, power and authority and, if an individual, the capacity to enter into this Agreement, (iv) granted the powers of attorney set forth in this Agreement and (v) given the consents and approvals and made the waivers contained in this Agreement.

(f) The General Partner and its Affiliates shall have the right at any time to transfer their Subordinated Units and Common Units (whether issued upon conversion of the Subordinated Units or otherwise) to one or more Persons.

Section 4.6. Transfer of the General Partner’s General Partner Interest.

(a) Subject to Section 4.6(c) below, prior to March 31, 2011, the General Partner shall not transfer all or any part of its General Partner Interest to a Person unless such transfer (i) has been approved by the prior written consent or vote of the holders of at least a majority of the Outstanding Common Units (excluding Common Units held by the General Partner and its Affiliates) or (ii) is of all, but not less than all, of its General Partner Interest to (A) an Affiliate of the General Partner or (B) another Person in connection with the merger or consolidation of the General Partner with or into another Person or the transfer by the General Partner of all or substantially all of its assets to another Person.

(b) Subject to Section 4.6(c) below, on or after March 31, 2011, the General Partner may transfer all or any of its General Partner Interest without Unitholder approval.

(c) Notwithstanding anything herein to the contrary, no transfer by the General Partner of all or any part of its General Partner Interest to another Person shall be permitted unless (i) the transferee agrees to assume the rights and duties of the General Partner under this Agreement and to be bound by the provisions of this Agreement, (ii) the Partnership receives an Opinion of Counsel that such transfer would not result in the loss of limited liability of any Limited Partner or of any limited partner or any member of the Operating Partnerships or cause the Partnership or the Operating Partnerships to be treated as an association taxable as a corporation or otherwise to be taxed as an entity for federal income tax purposes (to the extent not already so treated or taxed), (iii) such transferee also agrees to purchase all (or the appropriate portion thereof, if applicable) of the partnership or membership interest of the General Partner as the general partner or managing member of each other Group Member; and (iv) the organizational documents of the owner(s) of all the General Partner Interest, together, provide for the establishment of a “Conflicts Committee” to approve certain matters with respect to the General Partner and the Partnership, the selection of “Independent Directors” as members of such Conflicts Committee, and the submission of certain matters to the vote of such Conflicts Committee upon similar terms and conditions as set forth in the limited liability company agreement of the General Partner, as the same exists as of the date of this Agreement so as to provide the Limited Partners and the General Partner with the same rights and obligations as are herein contained. In the case of a transfer pursuant to and in compliance with this Section 4.6, the transferee or successor (as the case may be) shall, subject to compliance with the terms of Section 10.3, be admitted to the Partnership as a General Partner immediately prior to the transfer of the Partnership Interest, and the business of the Partnership shall continue without dissolution.

Section 4.7. Transfer of Incentive Distribution Rights.

Prior to March 31, 2011, a holder of Incentive Distribution Rights may transfer any or all of the Incentive Distribution Rights held by such holder without any consent of the Unitholders (a) to an Affiliate or (b) to another Person in connection with (i) the merger or consolidation of such holder of Incentive Distribution Rights with or into such other Person or (ii) the transfer by such holder of all or substantially all of its assets to such other Person. Any other transfer of the Incentive Distribution Rights prior to March 31, 2011, shall require the prior approval of holders at least a majority of the Outstanding Common Units (excluding Common Units held by the General Partner and its Affiliates). On or after March 31, 2011, the General Partner or any other holder of Incentive Distribution Rights may transfer any or all of its Incentive Distribution Rights without Unitholder approval. Notwithstanding anything herein to the contrary, no transfer of Incentive Distribution Rights to another Person shall be permitted unless the transferee agrees to be bound by the provisions of this Agreement. The General Partner shall have the authority (but shall not be required) to adopt such reasonable restrictions on the transfer of Incentive Distribution Rights and requirements for registering the transfer of Incentive Distribution Rights as the General Partner, in its sole discretion, shall determine are necessary or appropriate.

Section 4.8. Restrictions on Transfers.

(a) Except as provided in Section 4.8(d) below, but notwithstanding the other provisions of this Article IV, no transfer of any Partnership Interests shall be made if such transfer would (i) violate the then applicable federal or state securities laws or rules and regulations of the Commission, any state securities commission or any other governmental authority with jurisdiction over such transfer, (ii) terminate the existence or qualification of the Partnership under the laws of the jurisdiction of its formation, or (iii) cause the Partnership or Operating Partnerships to be treated as an association taxable as a corporation or otherwise to be taxed as an entity for federal income tax purposes (to the extent not already so treated or taxed).

(b) The General Partner may impose restrictions on the transfer of Partnership Interests if a subsequent Opinion of Counsel determines that such restrictions are necessary to avoid a significant risk of the Partnership becoming taxable as a corporation or otherwise to be taxed as an entity for federal income tax purposes. The restrictions may be imposed by making such amendments to this Agreement as the General Partner may determine to be necessary or appropriate to impose such restrictions; provided, however, that any amendment that the General Partner believes, in the exercise of its reasonable discretion, could result in the delisting or suspension of trading of any class of Limited Partner Interests on the principal National Securities Exchange on which such class of Limited Partner Interests is then traded must be approved, prior to such amendment being effected, by the holders of at least a majority of the Outstanding Limited Partner Interests of such class.

(c) The transfer of a Subordinated Unit that has converted into a Common Unit shall be subject to the restrictions imposed by Section 6.7(b).

(d) Nothing contained in this Article IV, or elsewhere in this Agreement, shall preclude the settlement of any transactions involving Partnership Interests entered into through the facilities of any National Securities Exchange on which such Partnership Interests are listed for trading.

Section 4.9. Citizenship Certificates; Non-citizen Assignees.

(a) If any Group Member is or becomes subject to any federal, state or local law or regulation that, in the reasonable determination of the General Partner, creates a substantial risk of cancellation or forfeiture of any property in which the Group Member has an interest based on the nationality, citizenship or other related status of a Limited Partner or Assignee, the General Partner may request any Limited Partner or Assignee to furnish to the General Partner, within 30 days after receipt of such request, an executed Citizenship Certification or such other information concerning his nationality, citizenship or other related status (or, if the Limited Partner or Assignee is a nominee holding for the account of another Person, the nationality, citizenship or other related status of such Person) as the General Partner may request. If a Limited Partner or Assignee fails to furnish to the General Partner within the aforementioned 30-day period such Citizenship Certification or other requested information or if upon receipt of such Citizenship Certification or other requested information the General Partner determines, with the advice of counsel, that a Limited Partner or Assignee is not an Eligible Citizen, the Partnership Interests owned by such Limited Partner or Assignee shall be subject to redemption in accordance with the provisions of Section 4.10. In addition, the General Partner may require that the status of any such Partner or Assignee be changed to that of a Non-citizen Assignee and, thereupon, the General Partner shall be substituted for such Non-citizen Assignee as the Limited Partner in respect of his Limited Partner Interests.

(b) The General Partner shall, in exercising voting rights in respect of Limited Partner Interests held by it on behalf of Non-citizen Assignees, distribute the votes in the same ratios as the votes of Partners (including without limitation the General Partner) in respect of Limited Partner Interests other than those of Non-citizen Assignees are cast, either for, against or abstaining as to the matter.

(c) Upon dissolution of the Partnership, a Non-citizen Assignee shall have no right to receive a distribution in kind pursuant to Section 12.4 but shall be entitled to the cash equivalent thereof, and the Partnership shall provide cash in exchange for an assignment of the Non-citizen Assignee’s share of the distribution in kind. Such payment and assignment shall be treated for Partnership purposes as a purchase by the Partnership from the Non-citizen Assignee of his Limited Partner Interest (representing his right to receive his share of such distribution in kind).

(d) At any time after he can and does certify that he has become an Eligible Citizen, a Non-citizen Assignee may, upon application to the General Partner, request admission as a Substituted Limited Partner with respect to any Limited Partner Interests of such Non-citizen Assignee not redeemed pursuant to Section 4.10, and upon his admission pursuant to Section 10.2, the General Partner shall cease to be deemed to be the Limited Partner in respect of the Non-citizen Assignee’s Limited Partner Interests.

Section 4.10. Redemption of Partnership Interests of Non-citizen Assignees.

(a) If at any time a Limited Partner or Assignee fails to furnish a Citizenship Certification or other information requested within the 30-day period specified in Section 4.9(a), or if upon receipt of such Citizenship Certification or other information the General Partner determines, with the advice of counsel, that a Limited Partner or Assignee is not an Eligible Citizen, the Partnership may, unless the Limited Partner or Assignee establishes to the satisfaction of the General Partner that such Limited Partner or Assignee is an Eligible Citizen or has transferred his Partnership Interests to a Person who is an Eligible Citizen and who furnishes a Citizenship Certification to the General Partner prior to the date fixed for redemption as provided below, redeem the Partnership Interest of such Limited Partner or Assignee as follows:

(i) The General Partner shall, not later than the 30th day before the date fixed for redemption, give notice of redemption to the Limited Partner or Assignee, at his last address designated on the records of the Partnership or the Transfer Agent, by registered or certified mail, postage prepaid. The notice shall be deemed to have been given when so mailed. The notice shall specify the Redeemable Interests, the date fixed for redemption, the place of payment, that payment of the redemption price will be made upon surrender of the Certificate evidencing the Redeemable Interests and that on and after the date fixed for redemption no further allocations or distributions to which the Limited Partner or Assignee would otherwise be entitled in respect of the Redeemable Interests will accrue or be made.

(ii) The aggregate redemption price for Redeemable Interests shall be an amount equal to the Current Market Price (the date of determination of which shall be the date fixed for redemption) of Limited Partner Interests of the class to be so redeemed multiplied by the number of Limited Partner Interests of each such class included among the Redeemable Interests. The redemption price shall be paid, in the discretion of the General Partner, in cash or by delivery of a promissory note of the Partnership in the principal amount of the redemption price, bearing interest at the rate of 10% annually and payable in three equal annual installments of principal together with accrued interest, commencing one year after the redemption date.

(iii) Upon surrender by or on behalf of the Limited Partner or Assignee, at the place specified in the notice of redemption, of the Certificate evidencing the Redeemable Interests, duly endorsed in blank or accompanied by an assignment duly executed in blank, the Limited Partner or Assignee or his duly authorized representative shall be entitled to receive the payment therefor.

(iv) After the redemption date, Redeemable Interests shall no longer constitute issued and Outstanding Limited Partner Interests.

(b) The provisions of this Section 4.10 shall also be applicable to Limited Partner Interests held by a Limited Partner or Assignee as nominee of a Person determined to be other than an Eligible Citizen.

(c) Nothing in this Section 4.10 shall prevent the recipient of a notice of redemption from transferring his Limited Partner Interest before the redemption date if such transfer is otherwise permitted under this Agreement. Upon receipt of notice of such a transfer, the General Partner shall withdraw the notice of redemption, provided the transferee of such Limited Partner Interest certifies to the satisfaction of the General Partner in a Citizenship Certification delivered in connection with the Transfer Application that he is an Eligible Citizen. If the transferee fails to make such certification, such redemption shall be effected from the transferee on the original redemption date.

ARTICLE V.

CAPITAL CONTRIBUTIONS AND ISSUANCE OF PARTNERSHIP INTERESTS

Section 5.1. Organizational Contributions.

In connection with the formation of the Partnership under the Delaware Act, the Predecessor General Partner made an initial Capital Contribution to the Partnership in the amount of $10.00 for an interest in the Partnership and was admitted as the Predecessor General Partner of the Partnership, and the Organizational Limited Partner made an initial Capital Contribution to the Partnership in the amount of $990.00 for an interest in the Partnership and was admitted as a Limited Partner of the Partnership. As of the Closing Date, the interest of the Organizational Limited Partner was redeemed as provided in the Contribution and Conveyance Agreement; the initial Capital Contributions of each Partner were refunded; and the Organizational Limited Partner ceased to be a Limited Partner of the Partnership. Ninety-nine percent of any interest or other profit that may have resulted from the investment or other use of such initial Capital Contributions was allocated and distributed to the Organizational Limited Partner, and the balance thereof was allocated and distributed to the Predecessor General Partner.

Section 5.2. Contributions by the General Partner and its Affiliates.

(a) On the Closing Date and pursuant to the Contribution and Conveyance Agreement, (i) the Predecessor General Partner contributed to the Partnership, as a Capital Contribution, all of its interest in Magellan Ammonia Pipeline, L.P. (formerly known as Williams Ammonia Pipeline, L.P.), a Delaware limited partnership, and all of its interest in Magellan Terminals Holdings, L.P. (formerly known as Williams Terminals Holdings, L.P.), a Delaware limited partnership, in exchange for (A) the continuation of its General Partner Interest, subject to all of the rights, privileges and duties of the General Partner under this Agreement, and (B) the Incentive Distribution Rights, (ii) Williams Natural Gas Liquids, Inc., contributed to the Partnership, as a Capital Contribution, all of its limited partner interest in Magellan OLP in exchange for 645,002 Common Units and 2,181,002 Subordinated Units and (iii) Williams Energy Services, LLC contributed to the Partnership, as a Capital Contribution, all of its limited partner interest in Magellan OLP in exchange for 2,714,386 Common Units and 9,178,386 Subordinated Units.

(b) Upon the issuance of any additional Limited Partner Interests by the Partnership (other than the issuance of the Common Units issued in the Initial Offering or pursuant to the Over-Allotment Option), the General Partner shall be required to make additional Capital Contributions equal to 2/98ths of any amount contributed to the Partnership by the

Limited Partners in exchange for such additional Limited Partner Interests, but only to the extent necessary such that the General Partner’s Capital Account is equal to 2% of the total of all Capital Accounts following such issuance. Except as set forth in the immediately preceding sentence and Article XII, the General Partner shall not be obligated to make any additional Capital Contributions to the Partnership.

(c) On each date provided for reimbursement of expenses to the General Partner pursuant to Section 7.4(b), the General Partner shall contribute an amount to the Partnership, as a Capital Contribution, equal to the amount of any Excess G&A Expenses outstanding on such date.

(d) Each payment by the General Partner or an Affiliate (other than a Group Member) in satisfaction of all or any portion of the Assumed Environmental Indemnification Obligations shall be treated as a Capital Contribution to the Partnership by the General Partner in the amount of such payment.

Section 5.3. Contributions by Initial Limited Partners and Reimbursement of the General Partner.

(a) On the Closing Date and pursuant to the Underwriting Agreement, each Underwriter contributed to the Partnership cash in an amount equal to the Issue Price per Initial Common Unit multiplied by the number of Common Units specified in the Underwriting Agreement to be purchased by such Underwriter at the Closing Date. In exchange for such Capital Contributions by the Underwriters, the Partnership issued Common Units to each Underwriter on whose behalf such Capital Contribution was made in an amount equal to the quotient obtained by dividing (i) the cash contribution to the Partnership by or on behalf of such Underwriter by (ii) the Issue Price per Initial Common Unit.

(b) Upon the exercise of the Over-Allotment Option, each Underwriter contributed to the Partnership cash in an amount equal to the Issue Price per Initial Common Unit, multiplied by the number of Common Units specified in the Underwriting Agreement to be purchased by such Underwriter at the Option Closing Date. In exchange for such Capital Contributions by the Underwriters, the Partnership issued Common Units to each Underwriter on whose behalf such Capital Contribution is made in an amount equal to the quotient obtained by dividing (i) the cash contributions to the Partnership by or on behalf of such Underwriter by (ii) the Issue Price per Initial Common Unit. Upon receipt by the Partnership of the Capital Contributions from the Underwriters as provided in this Section 5.3(b), the Partnership used such cash to redeem from Williams Energy Services, LLC that number of Common Units held by Williams Energy Services, LLC equal to the number of Common Units issued to the Underwriters as provided in this Section 5.3(b).

(c) No Limited Partner Interests were issued as of or at the Closing Date other than (i) the Common Units issued pursuant to subparagraph (a) hereof in aggregate number equal to 8,000,000 Units, (ii) the “ Option Units ” as such term is used in the Underwriting Agreement issued upon exercise of the Over-Allotment Option pursuant to subparagraph (b) hereof in an aggregate number of up to 1,200,000 Units, (iii) the 11,359,388 Subordinated Units issued to the Predecessor General Partner or its Affiliates pursuant to Section 5.2 hereof, and (iv) the Incentive Distribution Rights.

Section 5.4. Interest and Withdrawal.

No interest on Capital Contributions shall be paid by the Partnership. No Partner or Assignee shall be entitled to the withdrawal or return of its Capital Contribution, except to the extent, if any, that distributions made pursuant to this Agreement or upon termination of the Partnership may be considered as such by law and then only to the extent provided for in this Agreement. Except to the extent expressly provided in this Agreement, no Partner or Assignee shall have priority over any other Partner or Assignee either as to the return of Capital Contributions or as to profits, losses or distributions. Any such return shall be a compromise to which all Partners and Assignees agree within the meaning of 17-502(b) of the Delaware Act.

Section 5.5. Capital Accounts.

(a) The Partnership shall maintain for each Partner (or a beneficial owner of Partnership Interests held by a nominee in any case in which the nominee has furnished the identity of such owner to the Partnership in accordance with Section 6031(c) of the Code or any other method acceptable to the General Partner in its sole discretion) owning a Partnership Interest a separate Capital Account with respect to such Partnership Interest in accordance with the rules of Treasury Regulation Section 1.704-1(b)(2)(iv). Such Capital Account shall be increased by (i) the amount of all Capital Contributions made to the Partnership with respect to such Partnership Interest pursuant to this Agreement and (ii) all items of Partnership income and gain (including, without limitation, income and gain exempt from tax) computed in accordance with Section 5.5(b) and allocated with respect to such Partnership Interest pursuant to Section 6.1, and decreased by (x) the amount of cash or Net Agreed Value of all actual and deemed distributions of cash or property made with respect to such Partnership Interest pursuant to this Agreement and (y) all items of Partnership deduction and loss computed in accordance with Section 5.5(b) and allocated with respect to such Partnership Interest pursuant to Section 6.1.

(b) For purposes of computing the amount of any item of income, gain, loss or deduction which is to be allocated pursuant to Article VI and is to be reflected in the Partners’ Capital Accounts, the determination, recognition and classification of any such item shall be the same as its determination, recognition and classification for federal income tax purposes (including, without limitation, any method of depreciation, cost recovery or amortization used for that purpose), provided, that:

(i) Solely for purposes of this Section 5.5, the Partnership shall be treated as owning directly its proportionate share (as determined by the General Partner based upon the provisions of the Operating Partnership Agreements) of all property owned by the Operating Partnerships or any other Subsidiary that is classified as a partnership for federal income tax purposes.

(ii) All fees and other expenses incurred by the Partnership to promote the sale of (or to sell) a Partnership Interest that can neither be deducted nor amortized under

Section 709 of the Code, if any, shall, for purposes of Capital Account maintenance, be treated as an item of deduction at the time such fees and other expenses are incurred and shall be allocated among the Partners pursuant to Section 6.1.

(iii) Except as otherwise provided in Treasury Regulation Section 1.704-1(b)(2)(iv)(m), the computation of all items of income, gain, loss and deduction shall be made without regard to any election under Section 754 of the Code which may be made by the Partnership and, as to those items described in Section 705(a)(1)(B) or 705(a)(2)(B) of the Code, without regard to the fact that such items are not includable in gross income or are neither currently deductible nor capitalized for federal income tax purposes. To the extent an adjustment to the adjusted tax basis of any Partnership asset pursuant to Section 734(b) or 743(b) of the Code is required, pursuant to Treasury Regulation Section 1.704-1(b)(2)(iv)(m), to be taken into account in determining Capital Accounts, the amount of such adjustment in the Capital Accounts shall be treated as an item of gain or loss.

(iv) Any income, gain or loss attributable to the taxable disposition of any Partnership property shall be determined as if the adjusted basis of such property as of such date of disposition were equal in amount to the Partnership’s Carrying Value with respect to such property as of such date.

(v) In accordance with the requirements of Section 704(b) of the Code, any deductions for depreciation, cost recovery or amortization attributable to any Contributed Property shall be determined as if the adjusted basis of such property on the date it was acquired by the Partnership were equal to the Agreed Value of such property. Upon an adjustment pursuant to Section 5.5(d) to the Carrying Value of any Partnership property subject to depreciation, cost recovery or amortization, any further deductions for such depreciation, cost recovery or amortization attributable to such property shall be determined (A) as if the adjusted basis of such property were equal to the Carrying Value of such property immediately following such adjustment and (B) using a rate of depreciation, cost recovery or amortization derived from the same method and useful life (or, if applicable, the remaining useful life) as is applied for federal income tax purposes; provided, however, that, if the asset has a zero adjusted basis for federal income tax purposes, depreciation, cost recovery or amortization deductions shall be determined using any reasonable method that the General Partner may adopt.

(vi) If the Partnership’s adjusted basis in a depreciable or cost recovery property is reduced for federal income tax purposes pursuant to Section 48(q)(1) or 48(q)(3) of the Code, the amount of such reduction shall, solely for purposes hereof, be deemed to be an additional depreciation or cost recovery deduction in the year such property is placed in service and shall be allocated among the Partners pursuant to Section 6.1. Any restoration of such basis pursuant to Section 48(q)(2) of the Code shall, to the extent possible, be allocated in the same manner to the Partners to whom such deemed deduction was allocated.

(c) (i) A transferee of a Partnership Interest shall succeed to a pro rata portion of the Capital Account of the transferor relating to the Partnership Interest so transferred.

(ii) Immediately prior to the transfer of a Subordinated Unit or of a Subordinated Unit that has converted into a Common Unit pursuant to Section 5.8 by a holder thereof (other than a transfer to an Affiliate unless, the General Partner elects to have this subparagraph 5.5(c)(ii) apply), the Capital Account maintained for such Person with respect to its Subordinated Units or converted Subordinated Units will (A) first, be allocated to the Subordinated Units or converted Subordinated Units to be transferred in an amount equal to the product of (x) the number of such Subordinated Units or converted Subordinated Units to be transferred and (y) the Per Unit Capital Amount for a Common Unit, and (B) second, any remaining balance in such Capital Account will be retained by the transferor, regardless of whether it has retained any Subordinated Units or converted Subordinated Units. Following any such allocation, the transferor’s Capital Account, if any, maintained with respect to the retained Subordinated Units or converted Subordinated Units, if any, will have a balance equal to the amount allocated under clause (B) above, and the transferee’s Capital Account established with respect to the transferred Subordinated Units or converted Subordinated Units will have a balance equal to the amount allocated under clause (A) above.

(d) (i) In accordance with Treasury Regulation Section 1.704-1(b)(2)(iv)(f), on an issuance of additional Partnership Interests for cash or Contributed Property or the conversion of the General Partner’s Combined Interest to Common Units pursuant to Section 11.3(b), the Capital Account of all Partners and the Carrying Value of each Partnership property immediately prior to such issuance shall be adjusted upward or downward to reflect any Unrealized Gain or Unrealized Loss attributable to such Partnership property, as if such Unrealized Gain or Unrealized Loss had been recognized on an actual sale of each such property immediately prior to such issuance and had been allocated to the Partners at such time pursuant to Section 6.1(c) in the same manner as any item of gain or loss actually recognized during such period would have been allocated. In determining such Unrealized Gain or Unrealized Loss, the aggregate cash amount and fair market value of all Partnership assets (including, without limitation, cash or cash equivalents) immediately prior to the issuance of additional Partnership Interests shall be determined by the General Partner using such reasonable method of valuation as it may adopt; provided, however, that the General Partner, in arriving at such valuation, must take fully into account the fair market value of the Partnership Interests of all Partners at such time. The General Partner shall allocate such aggregate value among the assets of the Partnership (in such manner as it determines in its discretion to be reasonable) to arrive at a fair market value for individual properties.

(ii) In accordance with Treasury Regulation Section 1.704-1(b)(2)(iv)(f), immediately prior to any actual or deemed distribution to a Partner of any Partnership property (other than a distribution of cash that is not in redemption or retirement of a Partnership Interest), the Capital Accounts of all Partners and the Carrying Value of all Partnership property shall be adjusted upward or downward to reflect any Unrealized Gain or Unrealized Loss attributable to such Partnership property, as if such Unrealized Gain or Unrealized Loss had been recognized in a sale of such property immediately prior to such distribution for an amount equal to its fair market value, and had been allocated to the Partners, at such time, pursuant to Section 6.1(c) in the same manner as any item of gain or loss actually recognized during such period would have been allocated. In determining such Unrealized Gain or Unrealized Loss the aggregate cash

amount and fair market value of all Partnership assets (including, without limitation, cash or cash equivalents) immediately prior to a distribution shall (A) in the case of an actual distribution which is not made pursuant to Section 12.4 or in the case of a deemed contribution and/or distribution, be determined and allocated in the same manner as that provided in Section 5.5(d)(i) or (B) in the case of a liquidating distribution pursuant to Section 12.4, be determined and allocated by the Liquidator using such reasonable method of valuation as it may adopt.

Section 5.6. Issuances of Additional Partnership Securities.

(a) Subject to Section 5.7, the Partnership may issue additional Partnership Securities and options, rights, warrants and appreciation rights relating to the Partnership Securities for any Partnership purpose at any time and from time to time to such Persons for such consideration and on such terms and conditions as shall be established by the General Partner in its sole discretion, all without the approval of any Limited Partners.

(b) Each additional Partnership Security authorized to be issued by the Partnership pursuant to Section 5.6(a) may be issued in one or more classes, or one or more series of any such classes, with such designations, preferences, rights, powers and duties (which may be senior to existing classes and series of Partnership Securities), as shall be fixed by the General Partner in the exercise of its sole discretion, including (i) the right to share Partnership profits and losses or items thereof; (ii) the right to share in Partnership distributions; (iii) the rights upon dissolution and liquidation of the Partnership; (iv) whether, and the terms and conditions upon which, the Partnership may redeem the Partnership Security; (v) whether such Partnership Security is issued with the privilege of conversion or exchange and, if so, the terms and conditions of such conversion or exchange; (vi) the terms and conditions upon which each Partnership Security will be issued, evidenced by certificates and assigned or transferred; and (vii) the right, if any, of each such Partnership Security to vote on Partnership matters, including matters relating to the relative designations, preferences, rights, powers and duties of such Partnership Security.

(c) The General Partner is hereby authorized and directed to take all actions that it deems necessary or appropriate in connection with (i) each issuance of Partnership Securities and options, rights, warrants and appreciation rights relating to Partnership Securities pursuant to this Section 5.6, (ii) the conversion of the General Partner Interest and Incentive Distribution Rights into Units pursuant to the terms of this Agreement, (iii) the admission of Additional Limited Partners and (iv) all additional issuances of Partnership Securities. The General Partner is further authorized and directed to specify the relative rights, powers and duties of the holders of the Units or other Partnership Securities being so issued. The General Partner shall do all things necessary to comply with the Delaware Act and is authorized and directed to do all things it deems to be necessary or advisable in connection with any future issuance of Partnership Securities or in connection with the conversion of the General Partner Interest and Incentive Distribution Rights into Units pursuant to the terms of this Agreement, including compliance with any statute, rule, regulation or guideline of any federal, state or other governmental agency or any, National Securities Exchange on which the Units or other Partnership Securities are listed for trading.

Section 5.7. Limitations on Issuance of Additional Partnership Securities.

The issuance of Partnership Securities pursuant to Section 5.6 shall be subject to the following restrictions and limitations:

(a) During the Subordination Period, the Partnership shall not issue (and shall not issue any options, rights, warrants or appreciation rights relating to) an aggregate of more than 5,679,694 additional Parity Units without the prior approval of the holders of a Unit Majority. In applying this limitation, there shall be excluded Common Units and other Parity Units issued (A) in connection with the exercise of the Over-Allotment Option pursuant to Section 5.3(b), (B) in accordance with Sections 5.7(b), (c) and (f), (C) upon conversion of Subordinated Units pursuant to Section 5.8, (D) upon conversion of the General Partner Interest and Incentive Distribution Rights pursuant to Section 11.3(b), (E) pursuant to the employee benefit plans of the General Partner, the Partnership or any other Group Member and (F) in the event of a combination or subdivision of Common Units.

(b) During the Subordination Period, the Partnership may also issue an unlimited number of Common Units and other Parity Units without the prior approval of the Unitholders, if such issuance occurs (i) in connection with an Acquisition or a Capital Improvement or (ii) within 365 days of, and the net proceeds from such issuance are used to repay debt incurred in connection with, or to replenish cash reserves to the extent drawn down in connection with, an Acquisition or Capital Improvement, in each case where such Acquisition or Capital Improvement involves assets that, if acquired (or in the case of a Capital Improvement, put into commercial service) by the Partnership as of the date that is one year prior to the first day of the Quarter in which such Acquisition was consummated or such Capital Improvement was put into commercial service (“ One Year Test Period ”), would have resulted in an increase in:

(A) the amount of Adjusted Operating Surplus generated by the Partnership on a per-Unit basis (for all Outstanding Units) with respect to the One Year Test Period, on an estimated pro forma basis (as described below), as compared to

(B) the actual amount of Adjusted Operating Surplus generated by the Partnership on a per-Unit basis (for all Outstanding Units) with respect to the One Year Test Period, as adjusted as provided below.

The General Partner’s good faith determination that such an increase would have resulted shall be conclusive. The amount in clause (A) above shall be estimated by the General Partner in good faith using such assumptions as it believes are reasonable. There shall be excluded from the amount in clause (B) above any Operating Surplus attributable to such Acquisition or Capital Improvement (regardless of whether such Operating Surplus is positive or negative). The number of Units deemed to be Outstanding for the purpose of calculating the amount in clause (B) above shall be the weighted average number of Units Outstanding during the One Year Test Period and shall exclude the Units issued or to be issued in connection with such Acquisition or Capital Improvement or within 365 days of such Acquisition or Capital Improvement where the net proceeds from such issuance are used to repay debt incurred, or to replenish cash reserves to the extent drawn down, in connection with such Acquisition or Capital Improvement. For the

purposes of this Section 5.7(b), the term “debt” shall be deemed to include the indebtedness used to extend, refinance, renew, replace or defease debt originally incurred in connection with an Acquisition or Capital Improvement; provided, that, the amount of such indebtedness does not exceed the principal sum of, plus accrued interest on, the indebtedness so extended, refinanced, renewed, replaced or defeased.

(c) The Partnership may also issue an unlimited number of Parity Units, prior to the end of the Subordination Period and without the approval of the Unitholders, if the proceeds from such issuance are used exclusively to repay up to $40.0 million of indebtedness of a Group Member where the aggregate amount of distributions that would have been paid with respect to such newly issued Units or Partnership Securities, plus the related distributions on the General Partner Interest in the Partnership and the Operating Partnerships in respect of the four-Quarter period ending prior to the first day of the Quarter in which the issuance is to be consummated (assuming such additional Units or Partnership Securities had been Outstanding throughout such period and that distributions equal to the distributions that were actually paid on the Outstanding Units during the period were paid on such additional Units or Partnership Securities) did not exceed the interest costs actually incurred during such period on the indebtedness that is to be repaid (or, if such indebtedness was not outstanding throughout the entire period, would have been incurred had such indebtedness been outstanding for the entire period). In the event that the Partnership is required to pay a prepayment penalty in connection with the repayment of such indebtedness, for purposes of the foregoing test the number of Parity Units issued to repay such indebtedness shall be deemed increased by the number of Parity Units that would need to be issued to pay such penalty.

(d) During the Subordination Period, the Partnership shall not issue (and shall not issue any options, rights, warrants or appreciation rights relating to) additional Partnership Securities having rights to distributions or in liquidation ranking prior or senior to the Common Units, without the prior approval of the holders of a Unit Majority.

(e) No fractional Units shall be issued by the Partnership.

(f) During the Subordination Period, the Partnership may also issue an unlimited number of Common Units and other Parity Units without the prior approval of the Unitholders, if the net proceeds of such issuance are used to redeem an equal number of Outstanding Common Units at a price per unit equal to the net proceeds per unit, before expenses, that the Partnership receives from such issuance.

(g) During the Subordination Period, the Partnership may issue, without the approval of the Unitholders, and in connection with Acquisitions that have not been completed or Capital Improvements that have not Commenced Commercial Service, or both, an amount of Parity Units not to exceed the number of Parity Units then available for issuance without Unitholder approval pursuant to Section 5.7(a) (such number of Parity Units then available for issuance, the “ Remaining Basket Amount ”).

The following shall apply with respect to issuances of Parity Units pursuant to Sect