SIXTH AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF CROSSTEX ENERGY, L.P.

Exhibit 3.1

Execution Copy

SIXTH AMENDED AND RESTATED

AGREEMENT OF LIMITED PARTNERSHIP

OF

CROSSTEX ENERGY, L.P.

TABLE OF CONTENTS

SIXTH AMENDED AND RESTATED AGREEMENT OF LIMITED
PARTNERSHIP OF CROSSTEX ENERGY, L.P.

     THIS SIXTH AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF CROSSTEX ENERGY, L.P. dated as of March 23, 2007, is entered into by and among Crosstex Energy GP, L.P., a Delaware limited partnership, as the General Partner, together with any other Persons who become Partners in the Partnership or parties hereto as provided herein. In consideration of the covenants, conditions and agreements contained herein, the parties hereto hereby agree 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.

     “ 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 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 ” of a Partner means the Capital Account maintained for such Partner adjusted as provided herein. The balance of an Adjusted Capital Account at any time is the balance of the Capital Account at such time (a) increased by any amounts that such Partner is obligated at such time 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 losses and deductions that are reasonably expected at such time to be allocated to such Partner in subsequent taxable periods of the Partnership 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 are reasonably expected at such time to be made to such Partner in subsequent taxable periods to the extent they exceed offsetting increases to such Partner’s Capital Account that are reasonably expected to occur during (or prior to) the taxable period 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” in respect of a General Partner Interest, a Common Unit, a Senior Subordinated Unit, a Senior Subordinated Series C Unit, a Senior Subordinated Series D Unit, a Subordinated Unit or an Incentive Distribution

Right or any other Partnership Interest shall be the amount which the Adjusted Capital Account of a Partner would be if such Partnership Interest were the only interest in the Partnership held by that Partner from and after the date on which such Partnership 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 with respect to such period and (ii) any net reduction in cash reserves for Operating Expenditures with respect to such period not relating to an Operating Expenditure made with respect to such period, and (b) plus (i) any net decrease in Working Capital Borrowings with respect to such period, and (ii) any net increase in cash reserves for Operating Expenditures with respect to 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.

     “ 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.

     “ 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.

     “ Agreed Value ” of any item of property means the fair market value of such item of property 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 one or more properties that are 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 such item of property.

     “ Agreement ” means this Sixth Amended and Restated Agreement of Limited Partnership of Crosstex Energy, 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.

     “ 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 are 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 and (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.

     “ Book-Down Event ” means an event after which a negative adjustment is made to the aggregate Carrying Values of the assets of the Partnership pursuant to Section 5.5(d).

     “ Book-Up Event ” means an event after which a positive adjustment is made to the aggregate Carrying Values of the assets of the Partnership 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 State of Texas shall not be regarded as a Business Day.

     “ Capital Account ” of a Partner is maintained as provided in Section 5.5. The “ Capital Account ” in respect of a General Partner Interest, a Common Unit, a Senior Subordinated Unit, a Senior Subordinated Series C Unit, a Senior Subordinated Series D Unit, a Subordinated Unit, an Incentive Distribution Right or other Partnership Interest is the Capital Account that would be maintained if such Partnership Interest were the only interest in the Partnership held by a Partner from and after the date on which such 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 Agreements.

     “ 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, natural gas gathering or transmission pipelines and natural gas treating or processing plants and natural gas liquids pipelines, fractionation plants and storage and distribution facilities and related assets), in each case if such addition, improvement, acquisition or construction is 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 ” of an item of Partnership property immediately after the Closing Date is the fair market value of such item of Partnership property as determined by the General Partner using such reasonable method of valuation as it may adopt. For purposes hereof, the Partnership shall be treated as owning directly its share (as determined by the General Partner) of all property owned by the Operating Partnership or any other Subsidiary that is classified as a partnership or is disregarded for federal income tax purposes. The Carrying Value of any item of Partnership property shall be adjusted from time to time as provided in Section 5.5(b) and Section 5.5(d). The Carrying Value of an item of property that is acquired by the Partnership after the Closing Date shall be the amount that would be the adjusted basis for federal income tax purposes of such property in the hands of the Partnership immediately after its acquisition if the adjusted basis for federal income tax purposes of each asset of the Partnership at that time were equal to its Carrying Value at that time.

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

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

     “ Closing Date ” means the first date on which Common Units are 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 any successor law.

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

     “ 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 having the rights and obligations specified with respect to Common Units in this Agreement. The term “Common Unit” does not refer to a Senior Subordinated Unit, a Senior Subordinated Series C Unit, a Senior Subordinated Series D Unit or 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 two or more directors who are not (a) security holders, officers or employees of the General Partner, (b) officers, directors or employees of any Affiliate of the General Partner or (c) holders of any ownership interest in the Partnership Group other than Common Units and who also meet the independence standards required of directors who serve on an audit committee of a board of directors established by the National Securities Exchange on which the Common Units are listed for trading.

     “ 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.

     “ Contribution Agreements ” mean, collectively, the First Contribution Agreement and the Closing Contribution Agreement.

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

     “ Crosstex Energy, Inc. ” means Crosstex Energy, Inc., a Delaware corporation formerly named of Crosstex Energy Holdings Inc.

     “ Crosstex GP ” means Crosstex Energy GP, LLC, a Delaware limited liability company and the general partner of the General Partner.

     “ Crosstex Texas Inc. ” means Crosstex Energy Inc., a Texas corporation and former wholly-owned subsidiary of Crosstex Energy, Inc., a Delaware corporation, which subsequent to the Closing Date, was merged with and into Crosstex Energy, Inc.

     “ 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 Section 6.1(d)(x).

     “ 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. Section 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.

     “ 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).

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

     “ First Contribution Agreement ” means that certain Contribution, Conveyance and Assumption Agreement, dated as of November 27, 2002, among the General Partner, the Partnership, the Operating Partnership, Crosstex Energy, Inc. and certain other parties, together with the additional conveyance documents and instruments contemplated or referenced thereunder.

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

     “ First Target Distribution ” means $0.3125 per Unit per Quarter (or, with respect to the period commencing on the Closing Date and ending on March 31, 2003, it means the product of $0.3125 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 6.12.

     “ Fully Diluted Basis ” means, when calculating the number of Outstanding Units for any period, a basis that includes, in addition to the Outstanding Units, all Partnership Securities and options, rights, warrants and appreciation rights relating to an equity interest in the Partnership (a) that are convertible into or exercisable or exchangeable for Units that are senior to or pari passu with the Subordinated Units, (b) whose conversion, exercise or exchange price is less than the Current Market Price on the date of such calculation, and (c) that may be converted into or exercised or exchanged for such Units prior to or during the Quarter following the end of the last Quarter contained in the period for which the calculation is being made without the satisfaction of any contingency beyond the control of the holder other than the payment of consideration and the compliance with administrative mechanics applicable to such conversion, exercise or exchange; provided that for purposes of determining the number of Outstanding Units on a Fully Diluted Basis when calculating whether the Subordination Period has ended or Subordinated Units are entitled to convert into Common Units pursuant to Section 5.10, such Partnership Securities, options, rights, warrants and appreciation rights shall be deemed to have been Outstanding Units only for the four Quarters that comprise the last four Quarters of the measurement period; provided, further, that if consideration will be paid to any Group Member in connection with such conversion, exercise or exchange, the number of Units to be included in such calculation shall be that number equal to the difference between (i) the number of Units issuable upon such conversion, exercise or exchange and (ii) the number of Units which such consideration would purchase at the Current Market Price.

     “ General Partner ” means Crosstex Energy GP, L.P. 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.

     “ 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).

     “ Incentive Distribution Right ” means a non-voting Limited Partner Interest issued to the General Partner pursuant to Section 5.2, which Partnership Interest will confer 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 Section 6.4 or any other provision of this Agreement.

     “ 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, fiduciary 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 Crosstex Energy, Inc. 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 multiplied (in order to give effect to the Unit Split) by 50 percent, (b) with

respect to the Senior Subordinated Units, $37.4545 per unit, (c) with respect to the Senior Subordinated Series C Units, $36.48 per unit, (d) with respect to the Senior Subordinated Series D Units, $34.75 per unit, or (e) 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 (including the Common Units sold to the Underwriters pursuant to the exercise of the 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. In the case of (i) the Senior Subordinated Units, the Issue Price shall be deemed to be $33.4356 per unit, (ii) the Senior Subordinated Series C Units, the Issue Price shall be deemed to be $28.06 per unit and (iii) the Senior Subordinated Series D Units, the Issue Price shall be deemed to be $25.80 per unit.

     “ 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 Departing 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, Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D 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.

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

     “ Minimum Quarterly Distribution ” means $0.25 per Unit per Quarter (or with respect to the period commencing on the Closing Date and ending on March 31, 2003, it means the product of $0.25 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 6.12.

     “ 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 Stock 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 by the Partnership, the Partnership’s Carrying Value in such property assuming that the adjustment permitted by Section 5.5(d)(ii) is made immediately before the time such property is distributed, reduced by any indebtedness either assumed by the distributee 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 ” for any taxable period of the Partnership means the sum, if positive, of all items of income, gain, loss and deduction that are recognized by the Partnership during such taxable period and on or before the Liquidation Date. The items included in the calculation of Net Income shall be determined in accordance with Section 5.5(b) but shall not include any items allocated under Section 6.1(d).

     “ Net Loss ” for any taxable period of the Partnership means the sum, if negative, of all items of income, gain, loss or deduction that are recognized by the Partnership during such taxable period of the Partnership and on or before the Liquidation Date. The items included in the calculation of Net Loss shall be determined in accordance with Section 5.5(b) but shall not include any items allocated under Section 6.1(d).

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

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

     “ 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 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(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).

     “ Omnibus Agreement ” means that Omnibus Agreement, dated as of the Closing Date, among Crosstex Energy, Inc., the General Partner, Crosstex GP, the Partnership and the Operating Partnership.

     “ 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; and

          (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 Partnership ” means Crosstex Energy Services, L.P., a Delaware limited partnership, and any successors thereto.

     “ Operating Partnership Agreement ” means the Amended and Restated Agreement of Limited Partnership of the Operating Partnership, as it 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) $8.9 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 on 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 Crosstex Energy, Inc. 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, (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, or (iii) to any Person or Group who acquired 20% or more of any Partnership Securities issued by the Partnership with the prior approval of the board of directors of the General Partner.

     “ 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 (i) to receive 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, in each case regardless of whether the amounts or value so distributed or allocated on each Parity Unit equals the amount or value so distributed or allocated on each Common Unit. 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 or deduction determined in accordance with Section 5.5(b) 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 Crosstex Energy, L.P., a Delaware limited partnership, and any successors thereto.

     “ Partnership Group ” means the Partnership, the Operating Partnership and any Subsidiary of any such entity, 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, Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units, Subordinated Units and Incentive Distribution Rights.

     “ Percentage Interest ” means as of any date of determination (a) as to the General Partner (in its capacity as General Partner without reference to any Limited Partner Interests held by it), 2%, (b) as to any Unitholder or Assignee holding Units, the product obtained by multiplying (i) 98% less the percentage applicable to paragraph (c) by (ii) the quotient obtained by dividing (A) the number of Units held by such Unitholder or Assignee (or, in the case of Senior Subordinated Series D Units that are entitled to convert into a number of Common Units as provided in the second sentence of Section 5.10, the number of Common Units into which such Senior Subordinated Series D Units held by such Unitholder or Assignee would then convert under such Section 5.10) by (B) the total number of all Outstanding Units, and (c) as to the holders of additional Partnership Securities issued by the Partnership in accordance with Section 5.6, the number of Units to which such Partnership Securities are equivalent for the purpose of determining Percentage Interest (and only for such purpose) as determined by the General Partner as a part of 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.

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

     “ 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. 333-97779) 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.

     “ Required Allocations ” means (a) any limitation imposed on the allocation of Net Losses or Net Termination Losses under Section 6.1(b) or 6.1(c) that is identified therein as a Required Allocation and (b) any allocation of an item of income, gain, loss or deduction pursuant to Section 6.1(d) that is identified therein as a Required Allocation.

     “ Restricted Business ” has the meaning assigned to such term in the Omnibus Agreement.

     “ Second Target Distribution ” means $0.375 per Unit per Quarter (or, with respect to the period commencing on the Closing Date and ending on March 31, 2003, it means the product of $0.375 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 6.12.

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

     “ Senior Subordinated Series C Unit ” means a Unit representing a fractional part of the Partnership Interests of all Limited Partners and Assignees and having the rights and obligations specified with respect to Senior Subordinated Series C Units in this Agreement. The term “Senior Subordinated Series C Unit” as used herein does not include a Common Unit, a Parity Unit, a Subordinated Unit, a Senior Subordinated Unit, or a Senior Subordinated Series D Unit. A Senior Subordinated Series C Unit shall not constitute a Common Unit or Parity Unit until it converts into a Common Unit. For the avoidance of doubt, a Senior Subordinated Series C Unit shall not be considered senior or equal in right of distribution to a Subordinated Unit for the purposes of clause (a) of the definition of Subordination Period and the second sentence of Section 5.10 until such time as the Senior Subordinated Series C Unit is entitled by its terms to receive distributions of Available Cash from Operating Surplus.

     “ Senior Subordinated Series D Unit ” means a Unit representing a fractional part of the Partnership Interests of all Limited Partners and Assignees and having the rights and obligations specified with respect to Senior Subordinated Series D Units in this Agreement. The term

“Senior Subordinated Series D Unit” as used herein does not include a Common Unit, a Parity Unit, a Subordinated Unit, a Senior Subordinated Unit or a Senior Subordinated Series C Unit. A Senior Subordinated Series D Unit shall not constitute a Common Unit or Parity Unit until it converts into a Common Unit. For the avoidance of doubt, a Senior Subordinated Series D Unit shall not be considered senior or equal in right of distribution to a Subordinated Unit for the purpose of clause (a) of the definition of Subordination Period and the second sentence of Section 5.10 until such time as the Senior Subordinated Series D Unit is entitled by its terms to receive distributions of Available Cash from Operating Surplus.

     “ Senior Subordinated Unit ” means a Unit representing a fractional part of the Partnership Interests of all Limited Partners and Assignees and having the rights and obligations specified with respect to Senior Subordinated Units in this Agreement. The term “Senior Subordinated Unit” as used herein does not include a Common Unit, a Parity Unit, a Subordinated Unit, a Senior Subordinated Series C Unit or a Senior Subordinated Series D Unit. A Senior Subordinated Unit shall not constitute a Common Unit or Parity Unit until it converts into a Common Unit.

     “ Series D Target Distribution ” means $0.62 per Unit, subject to adjustment in accordance with Sections 6.6 and 6.12.

     “ 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 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, a Parity Unit, a Senior Subordinated Unit, a Senior Subordinated Series C Unit or a Senior Subordinated Series D 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, 2007 in respect of which (i) (A) distributions of Available Cash from Operating Surplus on each of the Outstanding Common Units and Subordinated Units and any other Outstanding Units that are senior or equal in right of distribution to the 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 and any other Outstanding Units that are senior or equal in right of distribution to the 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 and any other Units that are senior or equal in right of distribution to the Subordinated Units that were Outstanding during such periods on a Fully Diluted Basis, plus the

related distribution on the General Partner Interest, 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.

     “ 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).

     “ Taxable Period of the Partnership” or “taxable period of the Partnership” has the meaning assigned thereto in Section 5.5(b)(viii).

     “ 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 General Partner 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 December 11, 2002 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, Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units and Subordinated Units but shall not include (i) a General Partner Interest or (ii) Incentive Distribution Rights.

     “ Unit Split” has the meaning assigned to such term in Section 2.1.

     “ Unitholders ” means the holders of Units.

     “ Unit Majority ” means, during the Subordination Period, at least a majority of the Outstanding Common Units (excluding Common Units owned by the General Partner and its Affiliates) voting as a class and at least a majority of the Outstanding Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units and Subordinated Units voting as a single class, and thereafter, at least a majority of the Outstanding Common Units.

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

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

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

     “ 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.

     “ U.S. 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 used solely for working capital purposes or to pay distributions to Partners made pursuant to a credit facility or other arrangement to the extent such borrowings are required 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; (c) the term “include” or “includes” means includes, without limitation, and “including” means including, without limitation; and (d) references to directors, officers and employees of the General Partner shall mean the directors, officers and employees, respectively, of Crosstex GP acting on behalf of the General Partner.

ARTICLE II

ORGANIZATION

Section 2.1 Formation.

     The General Partner and the Organizational Limited Partner have previously formed the Partnership as a limited partnership pursuant to the provisions of the Delaware Act. The General Partner and the Limited Partners have previously entered into that certain Amended and Restated Agreement of Limited Partnership of the Partnership, dated as of December 17, 2002. On March 29, 2004, the General Partner and the Limited Partners entered into that certain Second Amended and Restated Agreement of Limited Partnership of the Partnership (i) to reflect the various numerical changes resulting from the two-for-one split in Common Units and Subordinated Units (the “Unit Split”) declared by Crosstex GP on February 26, 2004, having a record date of March 16, 2004 and a distribution date of March 29, 2004 (ii) and make other miscellaneous revisions. The Unit Split was effected in accordance with Section 5.13 of this Agreement, and all such numerical changes are reflected as if the Unit Split had occurred at the beginning of the Partnership’s existence. On June 24, 2005, the General Partner and the Limited Partners entered into that certain Third Amended and Restated Agreement of Limited Partnership of the Partnership (i) to establish the rights and obligations of the Senior Subordinated Units in connection with the issuance of such Partnership Securities pursuant to Section 5.7(e) of this Agreement and (ii) to make other miscellaneous revisions. On November 1, 2005, the General Partner and the Limited Partners entered into that certain Fourth Amended and Restated Agreement of Limited Partnership (i) to establish the rights and obligations of certain Units denominated as “Senior Subordinated Series B Units” in connection with the issuance of such Partnership Securities pursuant to Section 5.7(e) of this Agreement and (ii) to make other miscellaneous revisions. On June 29, 2006, the General Partner and the Limited Partners entered into that certain Fifth Amended and Restated Agreement of Limited Partnership (i) to establish the rights and obligations of the Senior Subordinated Series C Units in connection with the issuance of such Partnership Securities pursuant to Section 5.7(e) of this Agreement and (ii) to make other miscellaneous revisions. The purpose of this Sixth Amended and Restated Agreement of Limited Partnership is (i) to establish the rights and obligations of the Senior Subordinated Series D Units in connection with the issuance of such Partnership Securities pursuant to Section 5.7(e) of this Agreement and (ii) to make other miscellaneous revisions.

This amendment and restatement shall become effective on the date of this Agreement. 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.

Section 2.2 Name.

     The name of the Partnership shall be “Crosstex Energy, 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,” “L.P.,” “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 2501 Cedar Springs, Dallas, Texas 75201 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 2501 Cedar Springs, Dallas, Texas 75201 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 the Operating Partnership and, in connection therewith, to exercise all the rights and powers conferred upon the Partnership as a partner of the Operating Partnership pursuant to the Operating Partnership Agreement or otherwise, (b) 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 Partnership is permitted to engage in by the Operating Partnership Agreement or that its subsidiaries are permitted to engage in by their limited liability company or 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, (c) 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 is approved by the General Partner 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 (d) 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.

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 the 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, Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units or Subordinated Units to any Person, the Partnership may 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, the Partnership shall issue to such Person one or more certificates evidencing such Incentive Distribution Rights or other Partnership Securities. Certificates shall be executed on behalf of the Partnership by the Chairman of the Board, President or any Executive Vice President or 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 Sections 6.7(c), 6.8(c), 6.9(c) and 6.10(b), the Partners holding Certificates evidencing Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units or Subordinated Units may exchange such Certificates for Certificates evidencing Common Units on or after the date on which such Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units or Subordinated Units are converted into Common Units pursuant to the terms of Sections 5.8, 5.9, 5.10 and 5.11, respectively.

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 General Partner, that a previously issued Certificate has been lost, destroyed or stolen;

     (ii) requests the issuance of a new Certificate before the General Partner 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 General Partner, delivers to the General Partner a bond, in form and substance satisfactory to the General Partner, with surety or sureties and with fixed or open penalty as the General Partner 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 General Partner.

     If a Limited Partner or Assignee fails to notify the General Partner 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 General Partner 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 of the Partnership, 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 partner or other owner of the General Partner of any or all of the partnership interests or other ownership interests of the General Partner.

Section 4.5 Registration and Transfer of Limited Partner Interests.

     (a) The General Partner 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 General Partner 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 General Partner for such transfer; provided, that as a condition to the issuance of any new Certificate under this Section 4.5, the General Partner 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 December 31, 2012, 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 (other than an individual) or (B) another Person (other than an individual) in connection with the merger or consolidation of the General Partner with or into another Person (other than an individual) or the transfer by the General Partner of all or substantially all of its assets to another Person (other than an individual).

     (b) Subject to Section 4.6(c) below, on or after December 31, 2012, 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 of the Operating Partnership or cause the Partnership or the Operating Partnership 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) and (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, if any, of each other Group Member. 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 the 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 December 31, 2012, 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 of such holder (other than an individual) or (b) to another Person (other than an individual) in connection with (i) the merger or consolidation of such holder of Incentive Distribution Rights with or into such other Person, (ii) the transfer by such holder of all or substantially all of its assets to such other Person or (iii) the sale of all or substantially all of the equity interests of such holder to such other Person. Any other transfer of the Incentive Distribution Rights prior to December 31, 2012, shall require the prior approval of holders of at least a majority of the Outstanding Common Units (excluding Common Units held by the General Partner and its Affiliates). On or after December 31, 2012, 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.

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 or the Operating Partnership under the laws of the jurisdiction of its formation, or (iii) cause the Partnership or the Operating Partnership 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 any Group Member 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 Senior Subordinated Unit, a Senior Subordinated Series C Unit, a Senior Subordinated Series D Unit or a Subordinated Unit that has converted into a Common Unit shall be subject to the restrictions imposed by Sections 6.7(c), 6.8(c), 6.9(c) and 6.10(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 General Partner made an initial Capital Contribution to the Partnership in the amount of $20.00, for a 2% General Partner interest in the Partnership and has been admitted as the General Partner of the Partnership, and the Organizational Limited Partner made an initial Capital Contribution to the Partnership in the amount of $980.00 for a 98% Limited Partner interest in the Partnership and has been admitted as a Limited Partner of the Partnership. As of the Closing Date, the interest of the Organizational Limited Partner shall be redeemed as provided in the Closing Contribution Agreement; the initial Capital Contributions of the Organizational Limited Partner shall thereupon be refunded; and the Organizational Limited Partner shall cease to be a Limited Partner of the Partnership. Ninety-eight percent of any interest or other profit that may have resulted from the investment or other use of such initial Capital Contributions shall be allocated and distributed to the Organizational Limited Partner, and the balance thereof shall be allocated and distributed to the General Partner. On December 6, 2002 and pursuant to the First Contribution Agreement, among other things, (i) Crosstex Energy, Inc. and Crosstex Texas Inc. transferred their interests in the predecessor to the Operating Partnership to the Partnership in exchange for a limited partner interest in the Partnership and (ii) Crosstex Texas Inc. transferred its limited partner interest in the Partnership to the General Partner.

Section 5.2 Contributions by the General Partner and its Affiliates.

     (a) On the Closing Date and pursuant to the Closing Contribution Agreement, (i) the General Partner’s initial general partner interest and its limited partner interest was converted into (A) the 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, and (ii) Crosstex Energy, Inc.’s limited partner interest was converted (taking into account the effect of the Unit Split) into (A) 666,000 Common Units, (B) 9,334,000 Subordinated Units and (C) the right to receive $2.5 million from the Partnership on the Closing Date.

     (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 and other than the issuance of the Common Units issued 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 the additional Limited Partner Interests issued to such Limited Partners. 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.

Section 5.3 Contributions by Initial Limited Partners.

     (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 number of Common Units.

     (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 number of Common Units.

     (c) No Limited Partner Interests were issued or issuable as of or at the Closing Date other than (i) the Common Units issuable pursuant to subparagraph (a) hereof in aggregate number equal to 4,000,000, (ii) the “Additional Units” as such term is used in the Underwriting Agreement in an aggregate number up to 600,000 issuable upon exercise of the Over-Allotment Option pursuant to subparagraph (b) hereof, (iii) the 666,000 Common Units issuable to Crosstex Energy, Inc. pursuant to Section 5.2 hereof, (iv) the 9,334,000 Subordinated Units issuable to Crosstex Energy, Inc. pursuant to Section 5.2 hereof, and (v) the Incentive Distribution Rights.

Section 5.4 Interest and Withdrawal.

     No interest shall be paid by the Partnership on Capital Contributions. 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 Section 17-502(b) of the Delaware Act.

Section 5.5 Capital Accounts.

     The provisions of this Section 5.5 are subject to Section 5.5(e) which addresses the effect of the Unit Split.

     (a) The balance of the Capital Account of an Underwriter (and derivatively of the holder of one or more Common Units who purchases directly or indirectly from an Underwriter) in respect of each Common Unit acquired thereby pursuant to the Underwriting Agreement at the Closing or by reason of the exercise of the Over-Allotment Option shall be the Issue Price for an Initial Common Unit, and the balance of the Capital Account of each such Underwriter shall be the product of such initial balance for a Common Unit multiplied by the number of Common Units held thereby. The initial balance of the Capital Account of the General Partner and of its Affiliates shall be the amount of cash and the Net Agreed Value of the property of the Partnership (that is, the property for which the Partnership computes a Carrying Value) that would be distributed to the General Partner and any such affiliate pursuant to this Agreement

prior to the contributions that are to be made pursuant to Section 5.3 hereof if such cash and Net Agreed Value were distributed only to the General Partner Interest and the Units held by the General Partner and its Affiliates in proportion to the relative right of such interests to distributions that are made 2% to the General Partner Interest and 98% to the holders of Units, Pro Rata. The balance of the Capital Accounts of the Common Units held by such a Person shall be determined as though the aggregate amount that was deemed distributed with respect to the Units held thereby was distributed first to such Common Units, Pro Rata until the Initial Issue Price was distributed to each Common Unit held thereby. The balance of the Capital Accounts of the Subordinated Units held by such a Person shall be the portion of such cash and Net Agreed Value that could have been, but was not, applied pursuant to the preceding sentence in determining the Capital Account balance of the Common Units. Any Common Unit the Capital Account balance of which is less than the Initial Issue Price shall be treated as a converted Subordinated Unit for purposes of Section 5.5(c)(ii) and Section 6.10(b) and as a Final Subordinated Unit for purposes of Section 6.1(d)(ix). The initial Capital Account balance in respect of each Senior Subordinated Unit shall be the Issue Price for such Senior Subordinated Unit, and the initial Capital Account balance of each holder of Senior Subordinated Units in respect of all Senior Subordinated Units held shall be the product of such initial balance for a Senior Subordinated Unit multiplied by the number of Senior Subordinated Units held thereby. The initial Capital Account balance in respect of each Senior Subordinated Series C Unit shall be the Issue Price for such Senior Subordinated Series C Unit, and the initial Capital Account balance of each holder of Senior Subordinated Series C Units in respect of all Senior Subordinated Series C Units held shall be the product of such initial balance for a Senior Subordinated Series C Unit multiplied by the number of Senior Subordinated Series C Units held thereby. The initial Capital Account balance in respect of each Senior Subordinated Series D Unit shall be the Issue Price for such Senior Subordinated Series D Unit, and the initial Capital Account balance of each holder of Senior Subordinated Series D Units in respect of all Senior Subordinated Series D Units held shall be the product of such initial balance for a Senior Subordinated Series D Unit multiplied by the number of Senior Subordinated Series D Units held thereby. The initial Capital Account balance of any other Partner shall be zero. Thereafter, the Capital Account of each Partner shall be increased by (i) the amount of cash and the Net Agreed Value of property contributed to the Partnership by such Partner pursuant to this Agreement and (ii) all items of Partnership income and gain allocated to such Partner pursuant to Section 6.1, and it shall be decreased by (x) the amount of cash or Net Agreed Value of all distributions of cash or property made to such Partner pursuant to this Agreement and (y) all items of Partnership deduction and loss allocated to such Partner pursuant to Section 6.1. The General Partner may in connection with the issuance of Partnership Interests after the Initial Offering and the exercise (or not) of the Over-Allotment Option adjust the balance of the Capital Account of any Partner so as to preserve the agreed economic relationship between the Partnership Interests that are so issued and the Partnership Interests that were outstanding prior to such issuance; provided that the economic relationships between the Partnership Interests that were outstanding prior to such issuance are not changed thereby. Any such adjustment shall be recorded in the records of the Partnership.

     (b) The items of income, gain, loss or deduction that are recognized by the Partnership for federal income tax purposes during a taxable period of the Partnership shall be adjusted as is set out in this Section 5.5(b) and shall then be allocated among the Partners as is provided in Section 6.1.

     (i) The Partnership shall be treated as owning directly its share (as determined by the General Partner) of all property owned by the Operating Partnership or any other Subsidiary that is, in each case, classified as a partnership or is disregarded 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 cannot either be deducted or amortized under Section 709 of the Code shall be treated as an item of deduction at the time such fees and other expenses are incurred. Any such fees and expenses that were incurred in connection with the Initial Offering shall be deemed to have been incurred in the first taxable period of the Partnership that ends after the Initial Offering. Any underwriting discount or commission that is allowed to an Underwriter by reason of the Underwriting Agreement or the Over-Allotment Option, any difference between the Initial Unit Price and the Issue Price of the Senior Subordinated Units, any difference between the Initial Unit Price and the Issue Price of the Senior Subordinated Series C Units and any difference between the Initial Unit Price and the Issue Price of the Senior Subordinated Series D Units shall not be treated as an item of deduction of the Partnership that is allocable pursuant to Section 6.1.

     (iii) The computation of items of income, gain, loss and deduction shall be made without regard to any election under Section 754 of the Code; provided that if an adjustment to the adjusted tax basis of any Partnership asset is required pursuant to Section 734(b) or 743(b) of the Code, 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 shall be treated as an item of income or deduction, as the case may be, at the time of the adjustment, and the Carrying Value of each Partnership asset in respect of which there was such an adjustment shall also be adjusted at that time.

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

     (v) Any deductions for depreciation, cost recovery or amortization that are attributable to any Partnership property shall be determined as if the adjusted basis of such property were equal to the Carrying Value thereof and by 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 and appropriately taking into account the length of any short taxable period of the Partnership; provided, however, that, if the Partnership property 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. Any deduction for depreciation, cost recovery or amortization in respect of Partnership property that is determined pursuant to this Section 5.5(b) shall reduce the Carrying Value of that Partnership property as of the end of the taxable period of the Partnership in which such deduction was recognized. Notwithstanding the foregoing portion of this Section 5.5(b)(v), such deductions for depreciation, cost recovery, or amortization shall

be determined with respect to any portion of such Carrying Value with respect to which Treasury Regulation Section 1.704-3(d) remedial allocations are to be made (including reverse section 704(c) allocations that are to be made as Treasury Regulation Section 1.704-3(d) remedial allocations) pursuant to provisions hereof in accordance with a method that is permitted by such Treasury Regulation Section 1.704-3(d) and that is selected by the General Partner.

     (vi) If the Partnership’s adjusted basis in 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 be an additional depreciation or cost recovery deduction in the year such property is placed in service at the time of such reduction and shall be treated as a reduction in the Carrying Value of such property. Any restoration of such basis pursuant to Section 48(q)(2) of the Code shall be an item of income at the time of such restoration and shall be treated as an increase in the Carrying Value of such property at the time of such restoration.

     (vii) Any items of gain and loss that are determined pursuant to Section 5.5(d) hereof shall be treated as items of income and deduction, respectively, that are recognized in the taxable period of the Partnership that ends with the event that causes the determination of such gain or loss. An item of income of the Partnership that is described in Section 705(a)(1)(B) of the Code (with respect to items of income that are exempt from tax) shall be treated as an item of income for the purpose of this Section 5.5(b), and an item of expense of the Partnership that is described in Section 705(a)(2)(B) of the Code (with respect to expenditures that are deductible and not chargeable to capital accounts), shall be treated as an item of deduction for the purpose of this Section 5.5(b).

     (viii) A taxable period of the Partnership includes a taxable year of the Partnership. The portion of a taxable period of the Partnership that ends with the Closing Date or with an event in respect of which there is an adjustment to Carrying Values pursuant to Section 5.5(d) hereof shall be treated as the end of a taxable period of the Partnership. The portion of such taxable year of the Partnership that begins immediately thereafter shall be treated as a taxable period for purposes of the preceding sentence with the result that each taxable year of the Partnership may contain one or more taxable periods of the Partnership. The items of income, gain, loss and deduction of the Partnership that are recognized for federal, state or local income tax purposes prior to the Closing Date shall not be allocated pursuant to this Agreement.

     (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 Senior Subordinated Unit, a Senior Subordinated Series C Unit, a Senior Subordinated Series D Unit or a Subordinated Unit, or of a Senior Subordinated Unit, a Senior Subordinated Series C Unit, a Senior Subordinated Series D Unit or a Subordinated Unit that has converted into a Common Unit pursuant to Sections 5.8, 5.9, 5.10 or 5.11 (other than a transfer to an Affiliate unless the General Partner elects to have this Section 5.5(c)(ii) apply with respect to such transfer), the Capital Account maintained for such Person with respect to its Senior

Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units, Subordinated Units, converted Senior Subordinated Units, converted Senior Subordinated Series C Units, converted Senior Subordinated Series D Units or converted Subordinated Units, as the case may be, will (A) first, be allocated to such Units that are to be transferred so that the balance of the Capital Account thereof shall be equal to the then balance of the Capital Account of an Initial Common Unit, and (B) second, shall be allocated to any Senior Subordinated Units, Senior Subordinated Series C Units, Senior Subordinated Series D Units, Subordinated Units, converted Senior Subordinated Units, converted Senior Subordinated Series C Units, converted Senior Subordinated Series D Units or converted Subordinated Units that are retained. The amount so allocated to each class of Units shall thereafter be the balance of the Capital Account thereof.

     (d) (i) On an issuance of additional Partnership Interests for cash (excluding however any issuance of Units pursuant to the Over-Allotment Option) or other property or the conversion of a General Partner’s Combined Interest to Common Units pursuant to Section 11.3(b), the General Partner may cause any Unrealized Gain or Unrealized Loss attributable to Partnership property to be recognized as if there had been a sale of all such property immediately prior to such issuance in which event the Capital Accounts of all Partners (other than with respect to the Senior Subordinated Series D Units prior to their conversion into Common Units pursuant to Section 6.10) and the Carrying Value of each Partnership property shall be adjusted as of the beginning of the next taxable period to be equal to such fair market value; provided that the General Partner shall cause Unrealized Gain or Unrealized Loss to be recognized and Carrying Values to be adjusted if doing so would cause Corrective Allocations to be made pursuant to Section 6.1(d)(xi). In determining such Unrealized Gain or Unrealized Loss, the aggregate cash amount and fair market value of all Partnership assets 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). Any adjustments that are made under this paragraph in connection with the issuance of the Senior Subordinated Units shall be based on the Initial Unit Price of the Senior Subordinated Units.

     (ii) Immediately prior to any distribution to a Partner (other than a distribution of cash that is not in redemption or retirement of a Partnership Interest), the General Partner may cause any Unrealized Gain or Unrealized Loss attributable to each Partnership property to be recognized as if there had been a sale of such property immediately prior to such distribution in which event the Capital Accounts of all Partners (other than with respect to the Senior Subordinated Series D Units prior to their conversion into Common Units pursuant to Section 6.10) and the Carrying Value of each Partnership property shall be as of the beginning of the next taxable period equal to the fair market value thereof; provided that the General Partner shall cause Unrealized Gain or Unrealized Loss to be recognized and Carrying Values to be adjusted if doing so would permit Corrective Allocations to be made pursuant to Section 6.1(d)(xi). In determining such Unrealized Gain or Unrealized Loss the aggregate cash amount and fair market value of all Partnership assets immediately prior to a distribution shall (A) in the

case of a distribution that is not made pursuant to Section 12.4 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.

     (iii) After any adjustment of Carrying Values pursuant to Section 5.5(d)(i) or 5.5(d)(ii), the General Partner shall determine the way, if any, in which such changes in Carrying Value shall affect the allocations for federal, state and local income tax purposes pursuant to Section 6.2 of the items of income, gain, loss, deduction and credit that are recognized by the Partnership for such purposes. Any such determination shall be entered in the records of the Partnership.

     (e) The balance of the Capital Account of a Partner (which is the sum of the balances of the Capital Account of all the Units or other Partnership Interests that are owned by the Partner) shall be unchanged by reason of the Unit Split; but the balance of a Capital Account of a Common Unit or of a Subordinated Unit at the end of the first taxable period that ends after the Unit Split shall be 50 percent of the amount that would have been the balance thereof at that time if the Unit Split had not occurred. In particular, the balance of a Capital Account of a Common Unit and of a Subordinated Unit shall be determined pursuant to this Section 5.5 and other provisions of this Agreement as if the Unit Split had been effective immediately before the initial application of this Section 5.5 and by giving effect at that time to the reduction in Initial Unit Price that occurs with the amendments to this Agreement that implement the Unit Split. The foregoing shall be applied so that the effect of the Unit Split is to double the number of Common Units and the number of Subordinated Units that are held by a person who is a holder of Common Units or who is a holder of Subordinated Units prior to the record date for the Unit Split without any change being effected in the relative rights of any such Partner or Assignee, such as the right thereof to distributions. The General Partner may make such other changes to the determination of Capital Account balances as are necessary in its judgment to achieve the effect of the Unit Split that is described in the preceding sentence.

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 (the specification of which may include an amendment of Section 6.1); (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; (vii) the number of Units to which such Partnership Securities are equivalent for the purpose of determining Percentage Interest (and only for such purpose); and (viii) the right, if any, of each such Partnership Security to vote on Partnership matters, including matters relating to the relative rights, preferences and privileges 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 or any 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 or any 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 2,333,000 (plus an amount, if any, equal to one half of the number of Units issued pursuant to the Over-Allotment Option, if and to the extent exercised) additional Parity Units without the prior approval of the holders of a Unit Majority; provided that any Common Units that were issued prior to the Unit Split shall be counted as two Common Units for purposes of this Section 5.7. 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, (B) in accordance with Sections 5.7(b), 5.7(c) and 5.7(d), (C) upon conversion of Subordinated Units pursuant to Section 5.10, (D) upon conversion of the General Partner Interest or any Incentive Distribution Rights pursuant to Section 11.3(b), (D) pursuant to the employee benefit plans of the General Partner, the Partnership or any other Group Member, (E) upon a conversion or exchange of Parity Units issued after the date hereof into Common Units or other Parity Units; provided that the total amount of Available Cash required to pay the aggregate Minimum Quarterly Distribution on all Common Units and all Parity Units does not increase as a result of this conversion or exchange, and (F) in the event of a combination or subdivision of Common Units.

     (b) The Partnership may also issue an unlimited number of Parity Units, prior to the end of the Subordination Period and 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, an Acquisition or a Capital Improvement, in each case where such Acquisition or Capital Improvement involves assets that, if acquired by the Partnership as of the date that is one year prior to the first day of the Quarter in which such Acquisition is to be consummated or such Capital Improvement is to be completed, would have resulted, on a pro forma basis, 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 most recently completed four-Quarter period (on a 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) (excluding Adjusted Operating Surplus attributable to the Acquisition or Capital Improvement) with respect to such most recently completed four-Quarter period.

The General Partner’s good faith determination that such an increase would have resulted shall be conclusive. If the issuance of Parity Units with respect to an Acquisition or Capital Improvement occurs within the first four full Quarters after the Closing Date, then Adjusted Operating Surplus as used in clauses (A) (subject to the succeeding sentence) and (B) above shall be calculated (i) for each Quarter, if any, that commenced after the Closing Date for which actual results of operations are available, based on the actual Adjusted Operating Surplus of the Partnership generated with respect to such Quarter, and (ii) for each other Quarter, on a pro forma basis consistent with the procedures, as applicable, set forth in Appendix D to the Registration Statement. Furthermore, the amount in clause (A) shall be determined on a pro forma basis assuming that (1) all of the Parity Units to be issued in connection with or within 365 days of such Acquisition or Capital Improvement had been issued and outstanding, (2) all indebtedness for borrowed money to be incurred or assumed in connection with such Acquisition or Capital Improvement (other than any such indebtedness that is to be repaid with the proceeds of such issuance of Parity Units) had been incurred or assumed, in each case as of the commencement of such four-Quarter period, (3) the personnel expenses that would have been incurred by the Partnership in the operation of the acquired assets are the personnel expenses for employees to be retained by the Partnership in the operation of the acquired assets, and (4) the non-personnel costs and expenses are computed on the same basis as those incurred by the Partnership in the operation of the Partnership’s business at similarly situated Partnership facilities. For the purposes of this Section 5.7(b), the term “debt” shall be deemed to include 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 extended, refinanced, renewed, replaced or defeased indebtedness does not exceed the principal sum of, plus accrued interest on, the indebtedness so extended, replaced 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 indebtedness of a Group Member where the aggregate amount of distributions that would have been paid with respect to such newly issued Units, plus the related distributions on the General Partner Interest in the Partnership 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 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) would not have exceeded 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, without the prior approval of the holders of