FIRST AMENDMENT TO

                     REAL ESTATE PURCHASE AND SALE AGREEMENT

         THIS FIRST  AMENDMENT TO REAL ESTATE  PURCHASE AND SALE AGREEMENT (this
"Amendment")  is made as of the  28th  day of  February,  1997,  by and  between
MAGELLAN  HEALTH  SERVICES,  INC.,  a Delaware  corporation  ("Magellan"  or the
"Seller"),  and CRESCENT REAL ESTATE EQUITIES  LIMITED  PARTNERSHIP,  a Delaware
limited partnership (the "Purchaser").


                                R E C I T A L S:


A.       The parties  entered into that  certain  Real Estate  Purchase and Sale
         Agreement  dated as of  January  29,  1997 (the  "Agreement")  and that
         certain  Contribution  Agreement  dated as of  January  29,  1997  (the
         "Contribution  Agreement").  Capitalized  terms  used  but not  defined
         herein have the meanings ascribed to them in the Agreement.


B.       The  parties  desire to enter into this  Amendment  to  evidence  their
         agreement  to certain  changes to the  Agreement,  as  hereinafter  set
         forth,  and to  declare  the  Contribution  Agreement  null and void ab
         initio and of no force and effect.


         NOW,  THEREFORE,  in  consideration  of the mutual  covenants set forth
herein, the parties hereby agree as follows:


1.       Contribution  Agreement.  The parties hereby declare the  Contribution
         Agreement to be null and void ab initio and of no force and effect, as
         though it had never been entered into by them.


2.       Recitals  in  Agreement.  Recital A of the  Agreement  is amended  and
         restated in its entirety as follows:


                       In connection with the transactions  contemplated by this
                       Agreement,  Magellan and the Purchaser  have entered into
                       that  certain  Warrant  Purchase  Agreement  of even date
                       herewith (the "Warrant Purchase Agreement"). Magellan and
                       the  Purchaser  have also  agreed  that,  follow  ing the
                       execution  of the  Warrant  Purchase  Agreement  and this
                       Agree ment and  pursuant to the terms  hereof,  they will
                       cause certain other agreements to be executed, including,
                       without limitation,  (i) that certain Operating Agreement
                       of  Charter  Behavioral  Health  Systems,  LLC  ("OpCo"),
                       between  Magellan  and a designee of the  Purchaser to be
                       formed as a Delaware  limited  partnership or corporation
                       ("New Cres cent") (the "Operating Agreement"),  (ii) that
                       certain Contribution

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                       Agreement  among  Magellan,  OpCo and New  Crescent  (the
                       "OpCo  Con  tribution  Agreement"),  (iii)  that  certain
                       Master Franchise Agreement between Magellan and OpCo (the
                       "Master  Franchise  Agreement")  and  certain  additional
                       Franchise   Agreements   between   Magellan  and  certain
                       subsidiaries   of   OpCo   (the   "Subsidiary   Franchise
                       Agreements,  and col lectively with the Master  Franchise
                       Agreement, the "Franchise Agree ment"), (iv) that certain
                       Master Lease  Agreement  between the  Purchaser  and OpCo
                       (the "Facilities Lease"), (v) that certain  Subordination
                       Agree ment by and among Magellan,  the Purchaser and OpCo
                       (the  "Subordi  nation  Agreement"),  (vi)  that  certain
                       Warrant  Purchase  Agreement  (the  "Warrant  Agreement")
                       between  Magellan and New Crescent or Cres cent Corp. (as
                       such term is defined in the OpCo Contribution Agree ment)
                       and (vii) subject to certain  conditions set forth in the
                       OpCo Con tribution  Agreement,  that certain  Bridge Loan
                       and  Security   Agreement  and  Promissory  Note  between
                       Magellan  and OpCo (the  "Bridge  Loan  Agreement")  (the
                       Agreement,   this   Amendment,   the   Warrant   Purchase
                       Agreement, the Operating Agreement, the OpCo Contribution
                       Agree  ment,  the  Franchise  Agreement,  the  Facilities
                       Lease, the Subordination Agreement, the Warrant Agreement
                       and  the  Bridge   Loan   Agreement   are   referred   to
                       collectively as the  "Transaction  Documents," and all of
                       the  transactions  contemplated  hereby and  thereby  are
                       referred to collec tively as the "Transactions").


3.                     Seller's Representations and Warranties.

(a)                    Section  6.1(b) of the  Agreement is amended to add the
                       following new first sentence:

                       The  execution  and  delivery of this  Agreement  and the
                       other Transaction  Documents by Magellan and the Magellan
                       Subsidiaries   (as  defined  in  the  OpCo   Contribution
                       Agreement)  and  the  performance  by  Magellan  and  the
                       Magellan  Subsidiaries  of  all  obligations  under  this
                       Agreement and the other Transaction Documents, including,
                       without   limitation,   the  sale  and  delivery  of  the
                       Contributed  Assets, the Purchased Assets and the Working
                       Capital  Assets (as each such term is defined in the OpCo
                       Con tribution  Agreement) as contemplated  under the OpCo
                       Contribution Agreement,  have been duly authorized by all
                       necessary  corporate  action on the part of Magellan  and
                       the Magellan Subsidiaries.

(b)                    The  following  new  Section  6.1(bb)  is  added to the
                       Agreement:

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                       (bb) Magellan hereby makes the following  representations
                       and  warran  ties to the  Purchaser  with  respect to the
                       operation of the  businesses  con ducted at the Hospitals
                       (as defined in the OpCo Contribution  Agree ment), all of
                       which are true as of the date hereof:


                               (i) Insurance.  A complete and accurate  schedule
                               of all insurance policies  (including a statement
                               of  policy  limits  and   deductibles)   held  by
                               Magellan and the Magellan  Subsidiaries  relating
                               to  the  Hospitals  or the  businesses  conducted
                               therein   now  in   force,   including,   without
                               limitation,    malpractice,   public   liability,
                               property damage and workers compensation or other
                               coverage,   has  been  made   available   to  the
                               Purchaser.  All insurance policies remain in full
                               force and effect  except  where  such  failure to
                               remain in full force and  effect  will not have a
                               material  adverse  effect on a Hospital or on the
                               business of the Hospitals taken as a whole.


                               (ii)  Litigation.  Except asset forth in Schedule
                      5.1(f) to the OpCo  Contribution  Agreement,  there are no
                      lawsuits,  proceedings,  actions, arbitrations,  claims or
                      governmental  investigations,   inquiries  or  proceedings
                      pending  or, to the  knowledge  of  Magellan,  threatened,
                      against  Magellan  or  any  Magellan   Subsidiary  seeking
                      damages for an amount in excess of $1  million,  and there
                      is no action,  suit or  proceeding by any person or agency
                      pending or, to the knowledge of Magellan, threatened which
                      questions  the  legality or  validity of the  transactions
                      contemplated by the OpCo Contribution Agreement.


                               (iii)  Licenses,  Accreditation  and  Third-Party
                      Payors.  Magellan and the Magellan  Subsidiaries  hold all
                      licenses, permits, registrations, approvals, certificates,
                      contracts,   consents,   accreditations,   approvals   and
                      franchises  ("Operating  Licenses")  necessary  to  own or
                      lease the  Contributed  Assets and to conduct  and operate
                      the  Hospitals  in the manner  presently  operated and for
                      participation  in the Medicare and Medicaid  reimbursement
                      programs,  including,  without  limitation,  all licenses,
                      certificates of need and permits  required by the state in
                      which they  operate  and by all other  appropriate  health
                      care facility licensing agencies,  federal,  state, county
                      or local governmental authorities and regulatory agencies,
                      except where the failure to hold such  Operating  Licenses
                      would not have a material  adverse effect on a Hospital or
                      on the business of the Hospitals taken as a whole.

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                               (iv) The  Business.  Upon transfer to OpCo of the
                      Contributed  Assets,  the Purchased Assets and the Working
                      Capital Assets as  contemplated  in the OpCo  Contribution
                      Agreement,    and   consummation   of   the   transactions
                      contemplated  by the other  Transactional  Documents,  (i)
                      OpCo will have or, through the Franchise  Agreement,  will
                      have access to all tangible and intangible  assets and all
                      personnel  reasonably necessary to conduct a business that
                      is  substantially   the  same  as  and  that  operates  in
                      accordance  with the same  standards  of  operation as the
                      business of the Hospitals  prior to the Closing,  and (ii)
                      OpCo will have the means to provide the services specified
                      in Section 7.9 of the OpCo Contribution Agreement.


                               (v)  Contracts.   Schedule  5.1(i)  to  the  OpCo
                      Contribution Agreement contains a listing of all contracts
                      or series of related  contracts  which are material to the
                      business  of the  Hospitals,  taken as a whole  ("Material
                      Contracts"),  including all amendments,  modifications and
                      side letters thereto, currently in existence. With respect
                      to  each  Material  Contract,  neither  Magellan  nor  any
                      Magellan  Subsidiary has received a notice of termination,
                      has sent a notice of  termination,  is in default,  or has
                      any  knowledge  that  any  other  party  to such  Material
                      Contracts is in default thereunder.


                               (vi)  No  Other   Owned   Hospitals.   Except  as
                      described on Schedule 5.1(j), no Magellan  Subsidiary owns
                      or operates any Hospital other than the Hospitals operated
                      using  the  assets  which are  being  contributed  or sold
                      pursuant  to  this  Agreement  and the  OpCo  Contribution
                      Agreement.


                               (vii) Financial Statements. All books and records
                      relating to operating income and expenses of the Hospitals
                      made available to the Purchaser by Magellan were and shall
                      be those maintained by Magellan in regard to the Hospitals
                      in the normal  course of business.  The audited  Financial
                      Statements as of and for the year ended September 30, 1996
                      (the "1996 Financial Statements") furnished by Magellan to
                      the  Purchaser as a part of the Seller's  Deliveries  have
                      been  prepared  from the books and  records of Magellan in
                      the ordinary  course of business and present fairly in all
                      material  respects the results of  operations  of Magellan
                      for the periods then ended and the financial  condition of
                      Magellan as of the date of the 1996 Financial Statements.


                               (viii) No Material Adverse Change. Since the date
                      of Magellan's 1996 Financial Statements, there has been no
                      material  adverse  change in the  business  or  results of
                      operations of Magellan and the Magellan Subsidiaries taken
                      as a whole or the  business  of the  Hospitals  taken as a
                      whole.

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                               (ix) SEC Reports.  The periodic  reports filed by
                      Magellan with the Securities and Exchange  Commission with
                      respect to Magellan's  immediately  preceding  fiscal year
                      and any interim periods in its current fiscal year did not
                      as of their respective dates contain any untrue statements
                      of a  material  fact or omit to state  any  material  fact
                      required  to be stated  therein or  necessary  to make the
                      statements  therein,  in the  light  of the  circumstances
                      under which they were made, not misleading.


                               (x) Compliance With Laws.  Magellan has delivered
                      to the  Purchaser a draft dated  January 24, 1997  ("Proxy
                      Statement") of its proxy statement to shareholders for its
                      Annual  Meeting  of  Shareholders  at which,  among  other
                      matters,  shareholders  of Magellan will consider and vote
                      on  the   transactions   which  are  the  subject  of  the
                      Transaction  Documents.  Except as  described in the Proxy
                      Statement,  or in documents  filed with the Securities and
                      Exchange  Commission  pursuant to applicable law, Magellan
                      is not aware of any material risk that Magellan is, in the
                      conduct  of  the   Business   (as   defined  in  the  OpCo
                      Contribution Agreement) prior to the Closing, or that OpCo
                      will be, in the conduct of the Business after the Closing,
                      in violation of any  applicable  federal law  specifically
                      designed  to  regulate  the  healthcare  industry,   which
                      violation will have a material  adverse effect on Magellan
                      or OpCo.


4.      Representations and Warranties of the Purchaser.

(a)     Section  6.2(b) of the  Agreement is amended to add the following new
        first sentence:

                       The  execution  and  delivery of this  Agreement  and the
                       other  Transaction  Documents  by the  Purchaser  and the
                       consummation of the transactions con templated hereby and
                       thereby have been duly authorized by all necessary action
                       on the  part  of the  Purchaser,  including  its  general
                       partner.

(b)     The following new Section 6.2(d) is added to the Agreement:

                       (d) SEC Reports.  The periodic  reports filed by Crescent
                       Real Estate Equities  Company ("CEI") with the Securities
                       and   Exchange   Commission   with  re   spect  to  CEI's
                       immediately preceding fiscal year and any interim periods
                       in its current fiscal year did not as of their respective
                       dates contain any untrue statements of a material fact or
                       omit to state any  material  fact  required  to be stated
                       therein or necessary to make the statements  therein,  in
                       the  light of the  circumstances  under  which  they were
                       made, not misleading.

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5.                     Survival.  Section 8.4 of the  Agreement  is amended to
                       add, as the new last sentence thereof, the following:


                       Notwithstanding  the foregoing,  the  representations and
                       warranties set forth in (i) the first sentence of Section
                       6.1(b),  (ii) Section 6.1(bb),  (iii) the first sen tence
                       of Section  6.2(b),  and (iv) Section  6.2(d) (all as set
                       forth in this Amend  ment)  shall not survive the Closing
                       except to the  extent  set  forth in the same or  similar
                       form in the OpCo Contribution Agreement.


6.                     Seller's Covenants.

(a)                    Section  7.1(k) of the  Agreement is amended to add the
                       following as the new last two sentences:

                       Magellan  and  the  Purchaser   shall  cooperate  in  all
                       reasonable  respects  in  OpCo's  application  to  obtain
                       necessary licenses,  permits and governmental  approvals.
                       In connection  with each such  application on the part of
                       OpCo,  Magellan  will  promptly  furnish  OpCo  with such
                       information and data as is reasonably necessary to obtain
                       such license, permit or approval.

(b)                    The following new Sections  7.1(s) through  7.1(aa) are
                       added to the Agree ment:







                       (s)  Magellan's Pre-Closing Covenants.


                               (i) Preservation of Business.  Magellan covenants
                               and   agrees,   and  will  cause  each   Magellan
                               Subsidiary  to covenant and agree,  that from the
                               date  of  this  Agreement  to the  Closing  Date,
                               except as otherwise  specif  ically  agreed to in
                               writing  by  the  Purchaser,  Magellan  will  (i)
                               preserve   the  business   organization   of  the
                               Hospitals intact,  and (ii) preserve for OpCo the
                               goodwill of suppliers,  customers and others with
                               whom business relationships exist.


                               (ii)  Access  to   Information   and   Personnel.
                               Magellan agrees that the Purchaser shall have the
                               right to speak to any Magellan personnel and make
                               such  further  review  as it deems  necessary  or
                               advisable,  provided  that  the  Purchaser  shall
                               exercise reasonable efforts to coordinate such

                                      - 6 -







                               review with  Magellan and to minimize  disruption
                               to Magellan's  opera tions.  Notwithstanding  the
                               foregoing,  nothing  herein  contained  shall  be
                               deemed to provide the Purchaser with the right to
                               terminate  this  Agreement  or  any   Transaction
                               Document as a result of any such re view, and the
                               results of such  review  shall not be a condition
                               to the Closing of the Transaction Documents.


                               (iii)   Consents.    Magellan   shall   use   its
                               commercially  reasonable  best  efforts to obtain
                               consent to the assignment of all of the contracts
                               as  signed   under   Section   2.1  of  the  OpCo
                               Contribution Agreement.


                               (iv) No Change in Assets.  Except in the ordinary
                               course of business consistent with past practice,
                               Magellan  will not and will  cause  the  Magellan
                               Subsidiaries  not to, in any manner  which  would
                               result  in  a  material  adverse  change  in  the
                               Contributed  Assets,  Purchased Assets or Working
                               Capital Assets (i) sell or transfer, (ii) create,
                               incur or as sume  any  indebtedness  secured  by,
                               (iii) grant, create, incur or suffer to exist any
                               liens,  charges  or  encumbrances,  which did not
                               exist on the  date of this  Agreement,  on,  (iv)
                               incur any  liability  or  obligation  (abso lute,
                               accrued or  contingent),  with respect to, or (v)
                               write-down  the value on the books and records of
                               Magellan or a Magellan Subsidiary.


                               (v)  No  Change  in  Constitutive  Documents.  No
                               change  shall  be  made  in  the  Certificate  or
                               Articles of  Incorporation  or bylaws of Magellan
                               or any of the Magellan  Subsidiaries  which would
                               result  in  any   representa   tion  of  Magellan
                               becoming  untrue or in  preventing  Magellan from
                               full  performance of this Agreement and the other
                               Transaction Documents.


                               (vi)  Payment  and  Performance  of  Obligations.
                               Unless  being  disputed in good  faith,  Magellan
                               will not fail to pay and perform in its  ordinary
                               course and consistent  with past practice any and
                               all liabilities and obligations in respect of any
                               of the Contributed  Assets as the same mature and
                               become  owing,  or cause or permit any default or
                               penalty  to  exist  or  occur  under  any  of its
                               contracts or commitments.


                               (vii) No  Amendment.  Magellan  will  not  amend,
                               alter or terminate any agreement to which it is a
                               party and which is to be assumed by OpCo pursuant
                               to  this   Agreement   other  than   renewals  or
                               amendments in the ordinary and regular  course of
                               the Hospitals' business.

                                      - 7 -








                               (viii)  Changes in Material  Contracts.  Magellan
                               will not, and Magellan will not permit a Magellan
                               Subsidiary to, without the prior written  consent
                               of  the   Purchaser,   (i)  other  than  Material
                               Contracts  entered into in the ordinary course of
                               business,  enter into any Material  Contract that
                               will or  could  be  binding  upon  OpCo or  other
                               entity  operating  the  Hospitals and that is not
                               terminable  upon at most 30 days' notice,  unless
                               such contract will be fully performed by Magellan
                               or a  Magel  lan  Subsidiary  on  or  before  the
                               Closing,  or (ii) amend,  modify,  supple ment or
                               terminate any Material Contract other than in the
                               ordinary   course  of   business.   Any   consent
                               requested   by   Magellan    pursuant   to   this
                               subparagraph  (viii)  will be deemed  approved if
                               the Purchaser  does not respond by written notice
                               to  Magellan   within  ten  Business  Days  after
                               written notice from Magellan.


                       (t) Bridge  Financing.  On the Closing  Date,  either (i)
                       Magellan  shall provide OpCo with bridge  financing for a
                       one-year  term  in the  amount  of up to $55  million  as
                       requested  by OpCo to fund  its  working  capital  needs,
                       including   funding   OpCo's   acquisition   of  existing
                       supplies,  inventory, prepaid expenses, and other Working
                       Capital  Assets (the form of the Bridge Loan Agreement is
                       attached  as  Exhibit D and D-1 to the OpCo  Contribution
                       Agreement)  or (ii)  OpCo  shall  have  obtained  working
                       capital  financing of at least $55 million  pursuant to a
                       loan facility with a syndicate of financial institutions.


                      (u) Financial Statements.  Magellan shall provide  to  the
                      Purchaser  unaudited  financial statements relating to
                      Magellan  and the  business of the  Hospitals as may be
                      prepared by Magellan through the Closing Date.


                      (v) Insurance Reserves.  Magellan  will  cause  Plymouth
                      Insurance   Company  Ltd.   ("Plymouth")   to  maintain
                      reserves  in amounts  that are  reasonably  actuarially
                      adequate to cover risks insured by Plymouth  associated
                      with the operation of the business of the Hospitals.


                       (w) Trade Accounts.  Except for amounts  disputed in good
                       faith,  Magellan will cause to be paid all trade accounts
                       and costs and expenses of operation  and  maintenance  of
                       the  Facilities  incurred or  attributable  to the period
                       prior to the Closing,  and  Magellan  agrees to indemnify
                       and hold the  Purchaser  harm less  from  such  costs and
                       expenses.


                       (x) Services Agreements. Prior to closing, Magellan, in 
                       its capacity as a joint venturer,  will or will cause any
                       Magellan Subsidiary which is a joint

                                      - 8 -







                       venturer  in any Joint  Venture  that owns or  operates a
                       domestic Hospital,  which Joint Ventures are set forth on
                       Schedule  7.9  to the  OpCo  Contribution  Agreement  and
                       defined in the Franchise Agreement as "Existing Joint Ven
                       tures"  (a "Joint  Venture"),  to enter  into a  services
                       agreement  with  OpCo for  each  such  Hospital  owned or
                       operated by a Joint Venture,  pursuant to which OpCo will
                       perform,  to the extent agreed by joint venture partners,
                       all of  Magellan's  obligations  under the Joint  Venture
                       agreement in exchange for the payment to OpCo by Magellan
                       of all  distributions  and fees paid to Magellan by or on
                       behalf  of the  Joint  Venture.  Magellan  will  use  its
                       commercially   reasonable  best  efforts  to  obtain  the
                       consent  of  Magellan's  joint  venture  partners  to the
                       performance, by OpCo, of Magellan's obligations under the
                       Joint  Venture  Agreements.  Each service  agreement,  as
                       referred to in this Section 7.1(x),  shall be approved by
                       the Purchaser,  which approval shall not be  unreasonably
                       withheld.  The services  agreement(s)  shall  continue in
                       effect until termination of the Facilities Lease.


                       (y) Third Party  Consents;  Further  Assurances.  Each of
                       Magellan  and the  Purchaser  shall give (or shall  cause
                       their  respective  subsidiaries  to give) any  notices to
                       third  parties,  and  use,  and  cause  their  respective
                       subsidiaries  to use, all  commercially  reasonable  best
                       efforts to obtain  any third  party  consents  necessary,
                       proper or advisable for it to effect the  consummation of
                       the trans actions  contemplated by the OpCo  Contribution
                       Agreement.


                       (z) Employee Solicitation.  Magellan will not directly or
                       indirectly   induce  or  attempt  to  influence  any  key
                       employee  of the  Purchaser  to  leave  such em  ployee's
                       position  except as mutually  agreed by the Purchaser and
                       Magellan.  Prior to Closing,  Magellan and the  Purchaser
                       will  mutually  agree  as  to  which  employees  will  be
                       employed by OpCo, based on the contemplated  functions of
                       OpCo,  and which will be employed by  Magellan,  based on
                       the contem  plated  services  to be  supplied by Magellan
                       under the Franchise Agreement.


                       (aa) Assets.  Magellan agrees and covenants that, between
                       the date  hereof and the Closing  Date,  there will be no
                       material  change in the type of Working Capital Assets or
                       type or amount of Contributed Assets or Purchased Assets.


7.                     Limitation  on Survival of  Covenants.  Notwithstanding
                       anything  to the con trary  contained  herein,  Section
                       7.1(v)  shall not  survive  the  Closing  except to the
                       extent  set  forth in the same or  similar  form in the
                       OpCo Contribution Agreement.

                                      - 9 -








8.                     Purchaser's  Conditions  Precedent to Closing.  Section
                       8.1 of the  Agreement  is amended to add the  following
                       new subsections:


                       (p)  Purchaser  shall have  caused the  formation  of New
                       Crescent  as an entity  substantially  conforming  to the
                       description in Schedule  8.1(p) to the Agree ment and the
                       distribution  to the  public of  shares  of New  Crescent
                       (unless New  Crescent is the  operating  partnership,  in
                       which  case  the  distribution  of  shares  will  be from
                       Crescent Corp.).


                       (q) The OpCo Contribution  Agreement in the form attached
                       hereto as Exhibit A, updated to reflect any change in the
                       name or  form of  organization  of New  Crescent  (and/or
                       Crescent   Corp.),   shall  have  been  executed  by  New
                       Crescent, Magellan and OpCo.


                       (r) The  Operating  Agreement in the form attached to the
                       OpCo  Contribution  Agreement  as Exhibit  C,  updated to
                       reflect any change in the name or form of organization of
                       New  Crescent,  the names of the Directors and the source
                       of the initial bank  financing  referred to therein,  and
                       with all missing information completed prior to execution
                       thereof,  shall have been  executed  by New Cres cent and
                       Magellan.


                       (s) Unless  working  capital  financing has been obtained
                       from a  financial  institution  as  provided  in  Section
                       7.1(t) of the Agreement, the Bridge Loan Agreement in the
                       form  of  Exhibit  D and  D-1  to the  OpCo  Contribution
                       Agreement shall have been executed by Magellan and OpCo.


9.                     Seller's Conditions  Precedent to Closing.  Section 8.2
                       of the  Agreement is amended to add the  following  new
                       subsections:


                       (n)  Purchaser  shall have  caused the  formation  of New
                       Crescent  as an entity  substantially  conforming  to the
                       description in Schedule  8.1(p) to the Agree ment and the
                       distribution  to the  public of  shares  of New  Crescent
                       (unless New  Crescent is the  operating  partnership,  in
                       which  case  the  distribution  of  shares  will  be from
                       Crescent Corp.).


                       (o) The OpCo Contribution  Agreement in the form attached
                       hereto as Exhibit A, updated to reflect any change in the
                       name or  form of  organization  of New  Crescent  (and/or
                       Crescent   Corp.),   shall  have  been  executed  by  New
                       Crescent, Magellan and OpCo.

                                     - 10 -








                       (p) The  Operating  Agreement in the form attached to the
                       OpCo  Contribution  Agreement  as Exhibit  C,  updated to
                       reflect any change in the name or form of organization of
                       New  Crescent,  the names of the Directors and the source
                       of the initial bank  financing  referred to therein,  and
                       with all missing information completed prior to execution
                       thereof,  shall have been  executed  by New Cres cent and
                       Magellan.


                       (q) The Franchise  Agreement in the form of Exhibit B and
                       B-1 to the OpCo  Contribution  Agreement (except that (i)
                       the "Territory" for each Franchise Owner, as such term is
                       defined in the  Franchise  Agreement,  shall be specified
                       prior  to  execution   thereof  in  accordance  with  the
                       criteria  set  forth  on  Schedule  6.1(b)  to  the  OpCo
                       Contribution  Agreement and as  reasonably  determined by
                       Magellan  with input from the  individuals  who have been
                       designated  to be the  President  and the Chairman of the
                       Governing  Board of OpCo,  (ii) the identi  ties and fees
                       payable by each Franchise  Owner shall be specified prior
                       to  execution   thereof  and  (iii)  all  other   missing
                       information shall be completed prior to execution thereof
                       and  reflecting any change in the amount of the Franchise
                       Fee  thereunder as mutually  agreed by the parties) shall
                       have been executed by Magellan and, as  applicable,  OpCo
                       or the appropriate subsidiary of OpCo.


                       (r) The Warrant Agreement in the form of Exhibit E to the
                       OpCo  Contribu  tion  Agreement  (updated  to reflect any
                       change in the name or form of organi  zation of  Crescent
                       Corp.  and with the number of shares  issuable  under the
                       Warrant  completed  and  the  exercise  price  completed,
                       reflecting  the same  premium  as used to  calculate  the
                       exercise   price  for  the  warrants  under  the  Warrant
                       Purchase  Agreement,   and  based  upon  a  valuation  of
                       Crescent  Corp.  conducted  by  a  mutually  agreed  upon
                       independent   appraiser)  shall  have  been  executed  by
                       Magellan and Crescent Corp.


10.                    The  following new Section is added to Article 8 of the
                       Agreement:


                       8.4  Ownership  Limitation  on  Purchaser.  Both  parties
                       recognize that if the principal partner of the Purchaser,
                       CEI,  which  is a  real  estate  investment  trust  under
                       sections 856 to 859 of the Internal Revenue Code of 1986,
                       as amended (the "Code") (a "REIT"),  were  considered  to
                       own,  directly  or by  operation  of certain  attribution
                       rules, a specified interest in OpCo and/or entities owned
                       by OpCo which are the Tenant under the Facilities  Lease,
                       the  rents to be re  ceived  by the  Purchaser  would not
                       constitute  "rents  from  real  property"  under  section
                       856(d)  of the Code for  purposes  of  determining  CEI's
                       compliance

                                     - 11 -







                       with certain  requirements  of being a REIT. Both parties
                       agree that,  notwith standing anything to the contrary in
                       this   Agreement   or  any  of  the  other  Trans  action
                       Documents,  neither the  Purchaser,  nor any other entity
                       the  assets  of  which  would  be  attributed  to CEI for
                       federal  income tax  purposes in any period  during which
                       such entity owned such assets, has the right,  option, or
                       obligation, directly or indirectly, (i) to enter into the
                       OpCo Contribution  Agreement or (ii) otherwise to own any
                       entities  constituting such Tenant, and any attempt to do
                       so will be null and void ab initio.  Both  parties  agree
                       that the failure of the  Purchaser to cause the formation
                       and distribution of an entity substantially conforming to
                       the description in Schedule 8.1(p) of the Agreement shall
                       not  be  considered  (i) a  breach  entitling  Seller  to
                       enforce specific performance under Section 12.2(i) of the
                       Agreement   or  (ii)  a  breach  or  a  failure   to  use
                       commercially  reasonable best efforts entitling Seller to
                       recover damages under the last sentence of Section 8.3 or
                       under Section 12.2(ii) of the Agreement, but only if such
                       failure  by the  Purchaser  occurs  in  reliance  upon an
                       opinion of Shaw,  Pittman,  Potts & Trowbridge to the Pur
                       chaser that, if the Purchaser were to form and distribute
                       an entity substantially  conforming to the description in
                       Schedule  8.1(p)  of  the  Agreement,  the  rents  to  be
                       received by the  Purchaser  would  likely not  constitute
                       "rents  from  real  property"  or if such  formation  and
                       distribution  would likely expose the Pur chaser to a tax
                       exceeding  $10 million  under  section  857(b)(5)  of the
                       Internal Revenue Code of 1986, as amended.

11.                    Continuation of Agreement. The Agreement shall continue
                       in full force and  effect as  modified  hereby.  In the
                       event of any conflicts or inconsistencies  between this
                       Amendment   (including   all  exhibits  and   Schedules
                       attached  hereto) and the Agreement,  the provisions of
                       this Amendment shall control.


12.                    Counterparts.  This Amendment may be signed in any number
                       of counter  parts,  each of which  shall be an  original,
                       with the same effect as if the signa  tories  thereto and
                       hereto were upon the same  instrument.  Signatures may be
                       transmitted   by  facsimile  and  will  be  accepted  and
                       considered  effective  as  long as  such  signatures  are
                       followed  up with  signature  pages with  original  signa
                       tures within two (2) business days thereafter.








                                     - 12 -






IN WITNESS  WHEREOF,  this Amendment has been duly executed and delivered by the
parties hereto effective as of the date first above written.

                       CRESCENT REAL ESTATE EQUITIES
                       LIMITED PARTNERSHIP, a Delaware
                       limited partnership

                                By: Crescent Real Estate Equities, Ltd.,
                                        a Delaware corporation,
                                        its sole general partner

                                      By: /s/ Dallas E. Lucas
                                         ------------------------------
                                      Name: Dallas E. Lucas
                                      Title:   Chief Financial Officer

                       MAGELLAN HEALTH SERVICES, INC.,
                       a Delaware corporation

                                      By: /s/ Craig McKnight
                                         ------------------------------
                                      Name: Craig McKnight
                                      Title:   Executive Vice President CFO

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