Document:

Prepared by R.R. Donnelley Financial -- Fourth Amendment

  
 Exhibit 10.20 
  
 PRENTISS PROPERTIES ACQUISITION PARTNERS, L.P. 
  
 Fourth Amendment to the Third Amended and Restated Agreement of Limited 
 Partnership of Prentiss Properties Acquisition Partners, L.P.

  
 RECITALS 
  
 Belmar Real Estate Corporation desires to assign and Belrose Realty Corporation (“Assignee”) desires to acquire 350,000 8.30% Series B Preferred Units of the Partnership.

  
 Pursuant to Article XI of the Third Amended and Restated Agreement of Limited Partnership, dated as of October 1,
2001, as amended by amendments dated December 18, 2001, January 3, 2002 and March 19, 2002 (as so amended, the “Agreement”), of the Partnership, Prentiss Properties I, Inc. as the sole general partner of the Partnership (the
“General Partner”), desires to amend the Agreement to admit Assignee as a Substitute Limited Partner with respect to the Assigned Units; terms being used herein as defined in the Agreement. 
  
 NOW, THEREFORE, the General Partner hereby adopts the following amendment to the Agreement. 
  
 1.    Exhibit A to the Agreement is hereby amended and restated in its entirety as set forth on Exhibit A
attached hereto. 
  
 2.    Notwithstanding anything to the contrary in Section 4.02 (d) (viii) or
elsewhere in the Agreement, none of the 8.30% Series B Preferred Units held by Belrose Realty Corporation may be exchanged for Series B Preferred Shares prior to January 1, 2012. 
  
 3.    Assignee accepts and agrees to be bound by the terms and provisions of the Agreement. 
  
 [Signature Page Follows] 
  
 

 1 

  
 IN WITNESS WHEREOF, the General Partner, Assignor and the Assignee have executed
this Fourth Amendment as of July 30, 2002. 
  
 
	 GENERAL PARTNER
 
	 
	 PRENTISS PROPERTIES I, INC.
 
	 
	 By:
 	 	 /s/    MICHAEL A. ERNST
        
 

	  	 	 Name:    Michael A. Ernst
 Title:    Executive Vice President Chief Financial Officer
 
	 
	 ASSIGNEE AND SUBSTITUTE LIMITED PARTNER:
 
	 
	 BELROSE REALTY CORPORATION
 
	 
	 By:
 	 	 /s/    WILLIAM R. CROSS
        
 

	  	 	 Name:    William R. Cross
 Title:    Vice President
 
	 
	 ASSIGNOR:
 
	 
	 BELMAR REALTY CORPORATION
 
	 
	 By:
 	 	 /s/    WILLIAM R. CROSS
        
 

	  	 	 Name:    William R. Cross
 Title:    Vice President
 

 
 

 2<PAGE>

                                                                     EXHIBIT 4.1

                                 CONCENTRA INC.

                                   as Obligor

                                       and

                              THE BANK OF NEW YORK

                                   as Trustee

                         -------------------------------

                             SUPPLEMENTAL INDENTURE

                            Dated as of June 25, 2002

                                       to

                                    Indenture

                           Dated as of August 17, 1999

                         -------------------------------

                     14% Senior Discount Debentures due 2010

<PAGE>

         SUPPLEMENTAL INDENTURE dated as of June __, 2002, among Concentra Inc.,
a Delaware corporation (the "Company"), The Bank of New York, as successor to
United States Trust Company of New York, as trustee (the "Trustee"), and the
other parties listed on the signature pages hereto (collectively, the "Debenture
Holders").

         WHEREAS, the Company has heretofore executed and delivered to the
Trustee that certain Indenture dated as of August 17, 1999 (the "Company
Indenture"), providing for the issuance of 14% Senior Discount Debentures due
2010 (collectively, the "Debentures");

         WHEREAS, Concentra Operating Corporation, a Nevada corporation and
wholly-owned subsidiary of the Company ("Operating"), proposes to purchase (the
"Equity Clawback") a portion of its 13% Series A Senior Subordinated Notes due
2009 and 13% Series B Senior Subordinated Notes due 2009 (collectively, the
"Operating Notes") in accordance with the terms and provisions of that certain
Indenture dated as of August 17, 1999, among Operating, the Guarantors named
therein and the Trustee;

         WHEREAS, the Company proposes to issue $55,000,000 in original
principal amount of notes (the "Bridge Notes") under that certain Bridge Loan
Agreement of even date herewith (the "Bridge Loan Agreement"), among the
Company, the lenders that are parties thereto and Citicorp North America, Inc.,
as administrative agent (the "Bridge Notes Issuance");

         WHEREAS, the Company proposes to pay a portion of the proceeds of the
Bridge Notes Issuance to Operating in consideration for Operating issuing shares
of its common stock to the Company;

         WHEREAS, Operating shall use such proceeds to consummate the Equity
Clawback;

         WHEREAS, Section 1008 of the Company Indenture does not permit the
Company to incur the Indebtedness evidenced by the Bridge Notes and the Bridge
Loan Agreement;

         WHEREAS, the Debenture Holders desire to consent to the incurrence of
the Indebtedness evidenced by the Bridge Notes and the Bridge Loan Agreement;

         WHEREAS, the execution and delivery of this Supplemental Indenture has
been authorized by resolutions of the Board of Directors of the Company; and

         WHEREAS, all conditions and requirements necessary to make this
Supplemental Indenture a valid, legal, binding and enforceable instrument in
accordance with its terms have been performed and fulfilled by the parties
hereto and the execution and delivery thereof have been in all respects duly
authorized by the parties hereto.

         NOW, THEREFORE, in consideration of the above premises, each party
hereby agrees, for the benefit of the others and for the equal and ratable
benefit of the holders of the Debenture Holders, as follows:

                                        1

<PAGE>

                                    ARTICLE I

                  CONSENT TO ADDITIONAL INDEBTEDNESS; AMENDMENT

       Section 1.1 Additional Indebtedness. By executing this Supplemental
Indenture, each of the Debenture Holders hereby consents to (a) the incurrence
of all Indebtedness under the Bridge Loan Agreement (including, without
limitation, the Bridge Notes) and (b) the Amendments (as hereinafter defined).
The Company and the Trustee hereby amend the Company Indenture (the
"Amendments") to:

                   (i)   delete clause (5) in Section 1008 in its entirety and
insert the following language in lieu thereof:

              (5)  the incurrence by the Company or any of its Restricted
                   Subsidiaries of Permitted Refinancing Indebtedness in
                   exchange for, or the net proceeds of which are used to
                   refund, refinance or replace Indebtedness (other than
                   intercompany Indebtedness) that was permitted by this
                   Indenture to be incurred under the first paragraph of this
                   covenant or clauses (14), (15) or (16) of this Section 1008;

                   (ii)  delete the word "and" located at the end of clause
(14) in Section 1008;

                   (iii) delete the period at the end of clause (15) in
Section 1008 and replace it with the following: "; and";

                   (iv)  add to the definition of Permitted Debt in Section
1008 of the Company Indenture the following paragraph:

              (16) the incurrence by the Company of all Indebtedness under that
                   certain Bridge Loan Agreement dated June ___, 2002, among the
                   Company, the lenders that are parties thereto and Citicorp
                   North America, Inc., as administrative agent (including,
                   without limitation, the bridge notes delivered thereunder);

                   (v)   delete the first sentence in the final paragraph in
Section 1008 in its entirety and insert the following language in lieu thereof:

              For purposes of determining compliance with this Section 1008, in
              the event that an item of proposed Indebtedness meets the criteria
              of more than one of the categories of Permitted Debt in clauses
              (1) through (16) above or is entitled to be incurred pursuant to
              the first paragraph of this covenant, the Company shall be
              permitted to classify such item of Indebtedness in any manner that
              complies with this covenant.

                                        2

<PAGE>

                                   ARTICLE II

                            MISCELLANEOUS PROVISIONS

       Section 2.1 Defined Terms. For all purposes of this Supplemental
Indenture, except as otherwise defined or unless the context otherwise requires,
terms used in capitalized form in this Supplemental Indenture and defined in the
Company Indenture have the meanings specified in the Company Indenture.

       Section 2.2 Indenture. Except as amended hereby, the Company Indenture
and the Debentures are in all respects ratified and confirmed and all the terms
shall remain in full force and effect.

       Section 2.3 Governing Law. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED
BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK WITHOUT
REGARD TO PRINCIPLES OF CONFLICT OF LAWS.

       Section 2.4 Successors. All agreements of the Company in this
Supplemental Indenture and the Debentures shall bind its successors. All
agreements of the Trustee in this Supplemental Indenture shall bind its
successors.

       Section 2.5 Duplicate Originals. All parties may sign any number of
copies of this Supplemental Indenture. Each signed copy shall be an original,
but all of them together shall represent the same agreement.

       Section 2.6 Severability. In case any one or more of the provisions in
this Supplemental Indenture or in the Debentures shall be held invalid, illegal
or unenforceable, in any respect for any reason, the validity, legality and
enforceability of any such provision in every other respect and of the remaining
provisions shall not in any way be affected or impaired thereby, it being
intended that all of the provisions hereof shall be enforceable to the full
extent permitted by law.

       Section 2.7 Trustee Disclaimer. The Trustee accepts the amendment of the
Company Indenture effected by this Supplemental Indenture and agrees to execute
the trust created by the Company Indenture as hereby amended, but on the terms
and conditions set forth in the Company Indenture, including the terms and
provisions defining and limiting the liabilities and responsibilities of the
Trustee, which terms and provisions shall in like manner define and limit its
liabilities and responsibilities in the performance of the trust created by the
Company Indenture as hereby amended, and without limiting the generality of the
foregoing, the Trustee shall not be responsible in any manner whatsoever for or
with respect to any of the recitals or statements contained herein, all of which
recitals or statements are made solely by the Company, or for or with respect to
(i) the validity or sufficiency of this Supplemental Indenture or any of the
terms or provisions hereof, (ii) the proper authorization hereof by the Company
or any Debenture Holder by corporate action or otherwise, (iii) the due
execution hereof by the Company or any Debenture Holder or (iv) the consequences
(direct or indirect and whether deliberate or inadvertent) of any amendment
herein provided for, and the Trustee makes no representation with respect to any
such matters.

                                        3

<PAGE>

       Section 2.8 Effectiveness. This Supplemental Indenture shall become
effective, once executed by all necessary parties, upon receipt by the Trustee
of a certificate of the appropriate officers of the Company and an Opinion of
Counsel, each of which shall be dated no earlier than the date hereof.

            [The Remainder of This Page Is Intentionally Left Blank]

                                        4

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed as of the day and year written above.

Attest:                                 CONCENTRA INC.,
                                        as Obligor

     /s/ Richard A. Parr II             By:     /s/ Thomas E. Kiraly
-----------------------------------        ----------------------------------
Richard A. Parr II, Secretary           Name:       Thomas E. Kiraly
                                        Title:      Executive Vice President

                                        THE BANK OF NEW YORK,
                                        as Trustee

                                        By:     /s/ Margaret M. Ciesmelewski
                                           ------------------------------------
                                        Name:       Margaret M. Ciesmelewski
                                        Title:      Vice President

<PAGE>

                                        DEBENTURE HOLDERS

                                        WCAS CAPITAL PARTNERS III, L.P.

                                        By:    /s/ Jonathan Rather
                                           -----------------------------------
                                        Name:      Jonathan Rather
                                        Title:     Managing Member

                                        CHASE EQUITY ASSOCIATES, L.P.

                                        By:    /s/ Richard Duckers
                                           -----------------------------------
                                        Name:      Richard Duckers
                                        Title:     Partner

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