Document:

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                                                                   EXHIBIT 10.26
                                                                   -------------

                      SETTLEMENT AGREEMENT                      [Execution copy]
                      --------------------                      ----------------

THIS AGREEMENT (this "Agreement") is entered into as of January 4, 1999 between
Richard A. Gilleland ("Gilleland") and Physicians Resource Group, Inc., a
Delaware corporation ("PRG").

                             RECITATIONS OF FACTS:
                             ====================

     A.   On December 5, 1997, PRG and Gilleland entered into an employment
agreement (the "Employment Agreement") for the services of Gilleland as Chairman
of the Board, President, and Chief Executive Officer of PRG.  On October 2,
1998, a public announcement was made that Gilleland had been appointed Chief
Executive Officer of another company.  On October 29, 1998, Gilleland resigned
from the board of directors of PRG. Gilleland also resigned as an officer of
PRG.

     B.   Gilleland and PRG were in disagreement about the severance payments
owed to Gilleland under the Employment Agreement (the "Dispute").

     C.   Although not to be construed as an admission of liability by any party
to this Agreement, the parties to the Dispute and to this Agreement have
resolved the issues in the Dispute by mutual agreement, and the terms of the
resolution and agreement are contained in this Agreement.  By execution of this
document, all parties to this Agreement acknowledge that they clearly understand
each of the terms of this Agreement and have had an opportunity to seek legal
advice concerning this Agreement.

NOW, THEREFORE, for valuable consideration, the receipt and adequacy of which
are hereby acknowledged, the parties hereby agree as follows:

1.   Closing.  The "Closing" contemplated by this Agreement will occur on or
     -------        -------
before February 8, 1999, if counterpart signature pages have been executed by
both parties.

2.   Payment at Closing; Retention of Computers.  At the Closing, PRG shall
     ------------------------------------------
tender to the Gilleland a cashier's check made payable to the order of Gilleland
in the total amount of TWO HUNDRED THIRTY FIVE THOUSAND DOLLARS ($235,000.00),
which is the equivalent of a one year bonus ($270,000) (from January 5, 1998
through January 4, 1999) and an amount equal to Gilleland's salary from the date
of his last paycheck through January 4, 1999 ($45,000), minus a deduction
($80,000) discussed by the parties.  In addition,

                                                                    Page 1 of 4
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Gilleland shall have no obligation to return to PRG the obsolete personal
computer which PRG transferred to a student at Gilleland's request or the
obsolete personal computer which PRG transferred to Gilleland for his personal
use.

3.   Release; Termination of Employment Agreement and Stock Options.  In
     --------------------------------------------------------------
consideration of the foregoing, Gilleland agrees to and does hereby RELEASE,
ACQUIT, and FOREVER DISCHARGE PRG and each of its affiliates, directors,
officers, employees, attorneys, accountants, advisors and consultants from All
Claims and assigns, quitclaims and transfers to PRG All Claims.  As used herein,
"ALL CLAIMS" means all claims, demands, and causes of action, known or unknown,
pending or threatened, for all damages and remedies of any kind or nature
whatsoever that have been brought or that could have been brought by or on
behalf of Gilleland against PRG or any of its affiliates, directors, officers,
employees, attorneys, accountants, advisors or consultants directly or
indirectly arising out of the Employment Agreement and/or Gilleland's employment
relationship with PRG and/or his position as a director of PRG or otherwise
arising out of any matter that occurred prior to the date of this Agreement.
This definition of "All Claims" specifically excludes any and all obligations
and liabilities arising under or as a result of this Agreement.  All of PRG's
obligations under the Employment Agreement and all of the stock options granted
to Gilleland pursuant to or in connection with the Employment Agreement are
hereby terminated and cancelled and shall be of no further force and effect, and
the instruments evidencing such stock options shall be returned to PRG by
Gilleland immediately after the execution of this Agreement.

4.   Time To Review. Gilleland understands that this Agreement includes a
     --------------
release of claims arising under the Age Discrimination in Employment Act.
Gilleland understands and warrants that he has been offered a period of 21 days
to review and consider this Agreement. By his signature hereon, Gilleland
warrants that he has been fully and fairly advised by his legal counsel as to
the terms of this Agreement. Gilleland further warrants that he has used as much
or all of his 21-day period as he wished before signing and warrants that he has
done so.

5.   Revocation and Notice. Gilleland also warrants that he understands that he
     ---------------------
has until 5:00 p.m. (Pacific Standard Time) on the seventh day following the
execution of this Agreement to revoke this Agreement by notice in writing to
Michael Yeary, President of PRG by facsimile at (713) 629-0572, with a copy to
James S. Ryan, III, Jackson & Walker, by facsimile at (214) 953-5736, and the
original delivered by regular mail to the addresses shown at the end of this
Agreement.  This Agreement shall be binding, effective and enforceable upon the
parties upon the expiration of this seven-day revocation period if such
revocation notice has not been received by the persons indicated above prior
thereto.

                                                                    Page 2 of 4
<PAGE>

Contemporaneously with any such revocation, Gilleland must also return to PRG in
good funds the amount of the payment shown in Section 2 hereof.

6.   Adequacy of Consideration; No Admission Against Interest.  PRG and
     --------------------------------------------------------
Gilleland acknowledge the receipt and sufficiency of the consideration hereunder
by signing this Agreement.  Neither the execution of this Agreement nor the
payment or performance hereunder is an admission of liability or an admission
against interest by PRG or Gilleland and may not be so construed.  PRG and
Gilleland acknowledge that this Agreement is made as a compromise to avoid
further expense and to terminate for all time the Dispute.

7.   Assignment; Successors.  Subject to other provisions hereof, if any,
     ----------------------
limiting assignment, this Agreement shall inure to the benefit of and be binding
upon the parties hereto and their respective successors and assigns and, in the
case of individuals, their heirs and legal representatives.

8.   Severability.  Should any provision of this Agreement be held unenforceable
     ------------
or invalid under the laws of the United States of America or the State of Texas
or under any other applicable laws of any other jurisdiction, then the parties
hereto agree that such provision shall be deemed modified for purposes of
performance of this Agreement in such jurisdiction to the extent necessary to
render it lawful and enforceable, or if such a modification is not possible
without materially altering the intention of the parties hereto, then such
provision shall be severed herefrom for purposes of performance of this
Agreement in such jurisdiction.  The validity of the remaining provisions of
this Agreement shall not be affected by any such modification or severance,
except that if any severance materially alters the intentions of the parties
hereto as expressed herein (a modification being permitted only if there is no
material alteration), then the parties hereto shall use reasonable efforts to
agree to appropriate equitable amendments to this Agreement in light of such
severance.

9.   Entire Agreement.  THIS AGREEMENT REPRESENTS THE FINAL AGREEMENT AMONG THE
     ----------------
PARTIES WITH RESPECT TO THE SUBJECT MATTER HEREOF AND MAY NOT BE CONTRADICTED BY
EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS OF THE PARTIES.
THERE ARE NO UNWRITTEN ORAL AGREEMENTS AMONG THE PARTIES.

10.  Amendment; Waiver.  This Agreement may be amended, modified, superseded or
     -----------------
canceled, and any of the terms, provisions, representations, warranties,
covenants or

                                                                    Page 3 of 4
<PAGE>

agreements hereof may be waived, only by a written instrument executed by all
parties hereto, or, in the case of a waiver, by the party waiving compliance.

11.  Counterparts.  This Agreement may be executed simultaneously in two or more
     ------------
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.  This Agreement shall be
binding when one or more counterparts hereof, individually or taken together,
shall bear the signatures of the parties reflected hereon as signatories.

12.  Notices.  Any notices or other communications given under this Agreement
     -------
must be (i) given in writing and personally delivered or mailed by prepaid first
class mail or (ii) made by facsimile transmission to the party to whom such
notice or communication is directed, to the address or facsimile number of such
party stated beside its name on the signature lines below (or otherwise provided
to or obtained by the sending party), with a copy to the other persons
indicated.  Any such notice or other communication shall be deemed to have been
given (whether actually received or not) on the day it is mailed or personally
delivered or, if transmitted by facsimile, on the day that such notice is
transmitted.  Any party may change its address, telephone number or facsimile
number for purposes of this Agreement by giving notice of such change to the
other parties pursuant to this Section.

13.  Governing Law.  This Agreement shall be construed and enforced in
     -------------
accordance with the laws of the State of Texas, without regard to conflict-of-
laws rules as applied in Texas.

EXECUTED as of January 4, 1999.

/s/ Richard A. Gilleland                PHYSICIANS RESOURCE GROUP INC.
---------------------------
Richard A. Gilleland
(2/4/99)                                By: /s/ Michael Yeary, Pres.
                                            -----------------------------------
                                            Michael Yeary, President (2/8/99)

Mr. Richard A. Gilleland                Mr. Michael Yeary
2829 Townsgate Road, Suite 301          Physicians Resource Group, Inc.
Westlake Village, California 91361      5005 Riverway, Suite 400
Telephone  (805) 374-2737               Houston, Texas 77056
Facsimile: (805) 374-2736               Telephone: (713) 629-0572
                                        Facsimile: (713) 629-5780

                                                                    Page 4 of 4<PAGE>

                                                                    Exhibit 10.7

                         REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is entered into as of
                                               ---------
March 25, 1999, by and between Prentiss Properties Trust, a Maryland real estate
investment trust (the "Company"), and Value Enhancement Fund III, LLC, a Georgia
                       -------
limited liability company ( "VEF III").
                             -------

     WHEREAS, pursuant to that certain Amended and Restated Joint Venture
Agreement, dated as of March 25, 1999 (the "Venture Agreement"), by and between
                                            -----------------
Prentiss Properties Acquisition Partners, L.P., a Delaware limited partnership
(the "Operating Partnership"), and VEF III, the parties formed a joint venture
      ---------------------
(the "Joint Venture"); and
      -------------

     WHEREAS, pursuant to the Venture Agreement, VEF III acquired an 80%
interest in the Joint Venture which may be exchanged for common shares of
beneficial interest, par value $.01 per share, of the Company (the "Common
                                                                    ------
Shares") by written notice given to PPAP at any time after the second
------
anniversary and before the seventh anniversary of the date of this Agreement;
and

     WHEREAS, in connection with the Venture Agreement, the Company has agreed
to register for sale by VEF III and the Holders (as hereinafter defined) the
Registrable Securities (as hereinafter defined); and

     WHEREAS, the parties hereto desire to enter into this Agreement to evidence
the foregoing agreement of the Company to register the Registrable Securities
and the mutual covenants of the parties relating thereto.

     NOW, THEREFORE, in consideration of the foregoing and the covenants of the
parties set forth herein and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, subject to the terms
and conditions set forth herein, the parties hereby agree as follows:

     Section 1.  Certain Definitions.  In this Agreement the following terms
                 -------------------
shall have the following respective meanings:

     "Affiliate" shall mean, when used with respect to a specified Person,
      ---------
another Person that directly, or indirectly through one or more intermediaries,
controls or is controlled by or is under common control with the Person
specified.

     "Commission" shall mean the Securities and Exchange Commission or any other
      ----------
federal agency at the time administering the Securities Act.

     "Exchange Act" shall mean the Securities Exchange Act of 1934, as amended,
      ------------
and the rules and regulations of the Commission thereunder, all as the same
shall be in effect at the relevant time.

<PAGE>

     "Holders" shall mean (i) VEF III and (ii) any Permitted Assignee under the
      -------
Venture Agreement.

     "Partnership Agreement" shall mean the Second Amended and Restated
      ---------------------
Agreement of Limited Partnership of Prentiss Properties Acquisition Partners,
L.P., as amended, modified and supplemented from time to time.

     "Person" shall mean an individual, corporation, partnership, estate, trust,
      ------
association, private foundation, joint stock company or other entity.

     "Register," "Registered" and "Registration" refer to a registration
      --------    ----------       ------------
effected by preparing and filing a registration statement in compliance with the
Securities Act providing for the sale by the Holders of Registrable Securities
in accordance with the method or methods of distribution designated by the
Holders.

     "Registrable Securities" means the Common Shares issued in exchange for VEF
      ----------------------
III's interest in the Joint Venture and at any time owned, either of record or
beneficially, by any Holder and no matter how acquired (including, without
limitation, shares issued or issuable by way of stock dividend or stock split,
or in connection with a merger, consolidation, combination of shares,
recapitalization or other reorganization and any other securities issued
pursuant to any other distribution with respect to the Common Shares or in
exchange for or replacement of such Common Shares) until (i) a registration
statement covering such securities has been declared effective by the Commission
and such shares have been sold or transferred pursuant to such effective
registration statement, (ii) all such shares are permitted to be distributed in
a single transaction that would constitute a public sale thereof under the
Securities Act pursuant to Rule 144(k) or are otherwise freely transferable to
the public without registration pursuant to Section 4(l) of the Securities Act
(to be confirmed in a written opinion of counsel to the Company addressed to the
Holders) under circumstances in which all of the applicable conditions of Rule
144 are satisfied or (iii) such shares have been otherwise transferred pursuant
to an applicable exemption under the Securities Act, new securities for such
securities not bearing a legend restricting further transfer shall have been
delivered by the Company and such securities shall be freely transferable to the
public in a transaction that would constitute a sale thereof without
registration under the Securities Act.

     "Registering Holders" shall have the meaning set forth in Section 2(b).
      -------------------

     "Registration Expenses" shall mean all out-of-pocket expenses (excluding
      ---------------------
Selling Expenses) incurred by the Company or the Holders in complying with
Sections 2 and 3 hereof, including, without limitation, the following:  (a) all
registration, filing and listing fees;  (b) fees and expenses of compliance with
federal and state securities or real estate syndication laws (including, without
limitation, reasonable fees and disbursements of counsel of the Underwriters and
of one counsel of the Registering Holders (who shall be reasonably acceptable to
the Company) in connection with state securities and real estate syndication
qualifications of the Registrable Securities under the laws of such
jurisdictions as the Holders may reasonably designate);  (c) printing
(including, without limitation, expenses of printing or engraving certificates
for the Registrable Securities in a form eligible for deposit with The
Depository Trust

                                       2
<PAGE>

Company and otherwise meeting the requirements of any securities exchange on
which the Registrable Securities are listed and expenses of printing
registration statements and prospectuses), messenger, telephone, shipping and
delivery expenses; (d) fees and disbursements of counsel for the Company; (e)
fees and disbursements of all independent public accountants of the Company
(including, without limitation, the expenses of any annual or special audit and
comfort letters required by the managing underwriter); (f) Securities Act
liability insurance, if the Company so desires; (g) fees and expenses of other
Persons reasonably necessary in connection with the Registration, including any
experts, transfer agent or registrar, retained by the Company; (h) fees and
expenses incurred in connection with the listing of the Registrable Securities
on each securities exchange on which securities of the same class or series are
then listed; and (i) fees and expenses associated with any filing with the
National Association of Securities Dealers, Inc. required to be made in
connection with the registration statement.

     "Registration Request" shall have the meaning set forth in Section 2(b).
      --------------------

     "Rule 144" shall mean Rule 144 promulgated by the Commission under the
      --------
Securities Act.

     "Securities Act" shall mean the Securities Act of 1933, as amended, and the
      --------------
rules and regulations of the Commission thereunder, all as the same shall be in
effect at the relevant time.

     "Selling Expenses" shall mean all underwriting discounts, selling
      ----------------
commissions and stock transfer taxes applicable to any sale of Registrable
Securities.

     "Suspension Right" shall have the meaning set forth in Section 2(c).
      ----------------

     "Underwriter" means a securities dealer who purchases any Registrable
      -----------
Securities as principal and not as part of such dealer's market-making
activities.

     Section 2.  Registration.
                 ------------

     (a) Shelf Registration.  The Company agrees to file with the Commission a
         ------------------
resale shelf registration statement pursuant to Rule 415 of the Securities Act,
or similar rule that may be adopted by the Commission (the "Shelf
                                                            -----
Registration"), that shall include all Registrable Securities, at a time and in
------------
a manner reasonably designed to cause the Shelf Registration to be declared
effective by the Commission prior to the second anniversary of the date of this
Agreement.  The "Plan of Distribution" section of the Shelf Registration shall
permit sales by the Holders in privately negotiated purchases, underwritten
offerings, secondary distributions, block trades, ordinary brokerage
transactions or a combination of such methods of sale.  The Company will use its
reasonable best efforts to cause the Shelf Registration to be declared effective
under the Securities Act as soon as reasonably possible after filing.  The
Company will use its reasonable best efforts to keep the Shelf Registration
continuously effective until the earliest of (a) the date when all of the
Registrable Securities covered thereby are issued or sold thereunder, (b) the
date when all securities that were Registrable Securities on the date hereof
have ceased to be Registrable Securities or (c) the first date on which all of
the Common Shares covered thereby could, in the opinion of counsel for the
Company, be sold in any three month period pursuant to

                                       3
<PAGE>

Rule 144 under the Securities Act or any successor rule thereto (the "Shelf
                                                                      -----
Registration Period"). The Company further agrees to supplement or make
-------------------
amendments to the Shelf Registration, if required by the rules, regulations or
instructions applicable to the registration form utilized by the Company or by
the Securities Act or rules and regulations thereunder for the Shelf
Registration. No provision of this Section 2(a) shall require the Company to
file a registration statement on any form other than Form S-3 or a successor
form thereto. Notwithstanding this Section 2(a), the Company shall not be
obligated to take any action to effect any Registration, qualification or
compliance pursuant to this Section 2(a) in any particular jurisdiction in which
the Company would be required to execute a general consent to service of process
in effecting such Registration, qualification or compliance, unless the Company
already is subject to service in such jurisdiction.

     (b) Demand Registration.  After the second anniversary of the date of this
         -------------------
Agreement, upon receipt of a written request (a "Registration Request"), which
                                                 --------------------
shall include a description of such Holders' proposed method of distribution
(which method may also include an underwritten offering by a nationally
recognized Underwriter selected by the Company and reasonably acceptable to the
Registering Holders) from Holders holding a majority in interest of the
Registrable Securities, the Company shall (i) promptly give notice of the
Registration Request to all non-requesting Holders and (ii) prepare and file
with the Commission, within 30 days after receipt of such Registration Request,
an amendment or supplement to the Shelf Registration as may be required under
Rule 424 or any similar rule under the Securities Act to permit the sale of
Registrable Securities in the manner proposed in such Registration Request by
the requesting Holders and any other Holder who makes a written request of the
Company to have his Registrable Securities included in such offering, which such
written request must be received by the Company within 10 days after such Holder
receives the Registration Request (all of such Holders, collectively, the
"Registering Holders").  The Company shall use all commercially reasonable
--------------------
efforts to effect such Registration as soon as practicable after its receipt of
such Registration Request (including, without limitation, the execution of an
undertaking to file post-effective amendments and appropriate qualification
under the applicable state securities and real estate syndication laws).  The
Company shall keep such Registration continuously effective until the earlier of
either:  (i) the date when all securities that were Registrable Securities on
the date hereof have ceased to be Registrable Securities or (ii) two (2) years
from the effective date of the Registration.  Notwithstanding this Section 2(b),
the Company shall not be obligated to take any action to effect any
Registration, qualification or compliance pursuant to this Section 2(b) in any
particular jurisdiction in which the Company would be required to execute a
general consent to service of process in effecting such Registration,
qualification or compliance, unless the Company already is subject to service in
such jurisdiction. The Company shall not be required to effect more than two (2)
Registrations pursuant to this Section 2(b).

     (c) Suspension Right.  Notwithstanding the foregoing, the Company shall
         ----------------
have the right (the "Suspension Right") to defer its obligations under Section
                     ----------------
2(b) (or suspend sales under any filed registration statement or defer the
updating of any filed registration statement and suspend sales thereunder) for a
period not exceeding 45 days in any consecutive twelve month period, if the
Company shall furnish the Holders with a certificate signed by an executive
officer or any trustee of the Company stating that, in the good faith judgment
of the Company, it would

                                       4
<PAGE>

be detrimental to the Company and its shareholders to file such amendment or
supplement at such time (or continue sales under a filed registration statement)
and therefore the Company has elected to defer the filing of such amendment or
supplement (or suspend sales under a filed registration statement). The Company
shall extend the period during which a registration statement shall be
maintained effective by the number of days of suspension resulting from the
exercise of the Suspension Right.

     (d)  Piggy-Back Registration.
          -----------------------

          (i)  If the Company proposes to file a registration statement under
the Securities Act with respect to an offering by the Company to register any of
its common or preferred equity securities for its own account (a "Primary
                                                                  -------
Registration") or for the account of any of its respective securityholders (a
------------
"Secondary Registration") (other than (i) any registration statement filed by
-----------------------
the Company under the Securities Act relating to an offering of capital stock
for its own account as a result of the exercise of the exchange rights set forth
in Section 8.05 of the Partnership Agreement, and covering the resale by the
Holders of the shares of capital stock received in such exchange, (ii) a
registration statement on Form S-4 or S-8 (or any substitute form that may be
adopted by the Commission), (iii) an offering of securities in connection with
an employee benefit, share dividend, share ownership or dividend reinvestment
plan, or (iv) any registration statement filed in connection with an exchange
offer or offering of securities solely to the Company's existing
securityholders), then the Company shall promptly give written notice of such
proposed filing to the Holders of Registrable Securities and such notice shall
offer such Holders the opportunity to register such number of shares of
Registrable Securities as each such Holder may request (a "Piggy-Back
                                                           ----------
Registration"). The Company shall use all commercially reasonable efforts to
------------
include or to cause the managing Underwriter or Underwriters of a proposed
underwritten offering to permit the Registrable Securities requested to be
included in a Piggy-Back Registration to be included on the same terms and
conditions as any similar securities of the Company included therein.

          (ii) Withdrawal from Registration.  Any Holder requesting inclusion of
               ----------------------------
Registrable Securities pursuant to this Section 2(d) may, prior to the effective
date of the registration statement relating to such registration, revoke such
request by delivering written notice of such revocation to the Company and the
managing Underwriter, if any, at least two days prior to the effective date of
the registration; provided, however, that if the Company, in consultation with
its financial and legal advisors, determines that such revocation would
materially delay the registration or otherwise require a recirculation of the
prospectus contained in the registration statement, then such Holder shall have
no such right to revoke its request. If the withdrawal of any Registrable
Securities would allow, within the marketing limitations set forth below, the
inclusion in the underwriting of a greater number of shares of Registrable
Securities, then, to the extent practicable and without delaying the
underwriting, the Company shall offer to the Holders an opportunity to include
additional shares of Registrable Securities in the proportions discussed in
Section 2(e) below. Any Registrable Securities excluded or withdrawn from such
underwriting shall also be withdrawn from registration and shall not be
transferred in a public distribution prior to 90 days after the effective date
of the registration

                                       5
<PAGE>

statement relating thereto, or such shorter period of time as the managing
Underwriter may require.

          (iii)  Termination or Withdrawal by the Company. The Company shall
                 ----------------------------------------
have the right to terminate or withdraw any registration initiated by it under
this Section 2(d) prior to the effectiveness of such registration whether or not
any Holder has elected to include securities in such registration.

          (iv)   Holdback Agreement. If a Piggy-Back Registration is in
                 ------------------
connection with an underwritten Primary Registration, each Holder including
Registrable Securities in such Piggy-Back Registration agrees not to effect any
sale or distribution, including any sale under Rule 144, of any equity security
of the Company (otherwise than through the registered public offering then being
made), within 7 days prior to or 90 days after the effective date of the
applicable registration statement.

     (e)  Reduction of Offering.
          ---------------------

          (i)  If a Piggy-Back Registration is a Primary Registration and, if
the Piggy-Back Registration is not an underwritten offering, the Company in its
reasonable judgment determines that, or in the case of an underwritten Piggy-
Back Registration, the managing Underwriter or Underwriters advise the Company
in writing that in their opinion, the number of securities requested to be
included in such registration exceeds the number which can be sold in an orderly
manner within a price range acceptable to the Company, the Company will include
in such registration (a) first, the securities the Company proposes to sell and
(b) second, the Registrable Securities and other securities requested to be
included in such registration, pro rata among the holders of Registrable
Securities requesting such registration and the holders of such other securities
on the basis of the number of securities requested for inclusion in such
registration by each such holder.

          (ii) If a Piggy-Back Registration is a Secondary Registration on
behalf of holders of the Company's securities other than the holders of
Registrable Securities, and, if the Piggy-Back Registration is not an
underwritten offering, the Company determines that, or in the case of an
underwritten Piggy-Back Registration, the managing Underwriter or Underwriters
advise the Company in writing that in their opinion, the number of securities
requested to be included in such registration exceeds the number (the "Maximum
                                                                       -------
Number of Shares") which can be sold in an orderly manner in such offering
----------------
within a price range acceptable to the holders initially requesting such
registration, the Company will include in such registration the securities
requested to be included therein by the holders requesting such registration
and, to the extent that such number is less than the Maximum Number of Shares,
the Registrable Securities requested to be included in such registration,
reduced such that the number of Registrable Securities together with the shares
registered on behalf of the holders initially requesting such registration does
not exceed the Maximum Number of Shares.  The number of shares to be included by
each holder of Registrable Securities requesting such registration shall be pro
rata on the basis of the number of Registrable Securities initially requested
for inclusion in such registration by each such holder.

                                       6
<PAGE>

     Section 3.  Registration Procedures.
                 -----------------------

     (a)  The Company shall promptly notify the Registering Holders of the
occurrence of the following events:

          (i)    when any registration statement relating to such Registering
Holders' Registrable Securities, or any post-effective amendment thereto, filed
with the Commission has become effective;

          (ii)   the issuance by the Commission of any stop order suspending the
effectiveness of any registration statement relating to such Registering
Holders' Registrable Securities;

          (iii)  the Company's receipt of any notification of the suspension of
the qualification of any Registrable Securities covered by a registration
statement for sale in any jurisdiction; and

          (iv)   the existence of any event, fact or circumstance that results
in a registration statement or prospectus relating to such Registering Holders'
Registrable Securities or any document incorporated therein by reference
containing an untrue statement of material fact or omitting to state a material
fact required to be stated therein or necessary to make the statements therein
not misleading during the distribution of the securities.

          The Company agrees to use all commercially reasonable efforts to
obtain the withdrawal of any such order suspending the effectiveness of any such
registration statement or any state qualification as promptly as possible. By
acquisition of the Registrable Securities, the Registering Holders agree that
upon receipt of any notice from the Company of the occurrence of any event of
the type described in Sections 3(a)(ii), (iii) or (iv) to immediately
discontinue its disposition of its Registrable Securities pursuant to any
registration statement relating to such Registrable Securities until the
Registering Holders' receipt of written notice from the Company that such
disposition may be made. In the event the Company shall give notice as to the
occurrence of any event described in Sections 3(a)(ii), (iii) or (iv), the
Company shall extend the period during which such registration statement shall
be maintained effective by the number of days during the period from and
including the date of the giving of such notice to the date the Company delivers
notice that disposition may be made.

     (b)  The Company shall provide to the Registering Holders, at no cost to
such Holders, a copy of the registration statement and any amendment thereto
used to effect the Registration of such Registering Holders' Registrable
Securities, each prospectus contained in such registration statement or post-
effective amendment and any amendment or supplement thereto and such other
documents as such Holders may reasonably request in order to facilitate the
disposition of their Registrable Securities covered by such registration
statement. The Company consents to the use of each such prospectus and any
supplement thereto by such Holders in connection with the offering and sale of
their Registrable Securities covered by such registration statement or any
amendment thereto.

                                       7
<PAGE>

     (c)  The Company agrees to use all commercially reasonable efforts to cause
the Registering Holders' Registrable Securities covered by the registration
statement to be registered with or approved by such state securities authorities
as may be necessary to permit such Holders to consummate the disposition of such
shares pursuant to the plan of distribution set forth in the registration
statement;  provided, however, that the Company shall not be obligated to take
any action to effect any such Registration, qualification or compliance pursuant
to this Section 3 in any particular jurisdiction in which the Company would be
required to execute a general consent to service of process in effecting such
Registration, qualification or compliance unless the Company is already subject
to service in such jurisdiction.

     (d)  Subject to the Company's Suspension Right set forth in Section 2(c),
if any event, fact or circumstance requiring an amendment to a registration
statement relating to the Registering Holders' Registrable Securities or
supplement to a prospectus relating to such Registrable Securities shall exist,
immediately upon becoming aware thereof the Company agrees to notify such
Holders and prepare and file with the Commission and furnish to such Holders a
post-effective amendment to the registration statement or supplement to the
prospectus or any document incorporated therein by reference or file any other
required document so that, as thereafter delivered to the purchasers of such
Registrable Securities, the prospectus will not contain an untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading.

     (e)  The Company agrees to use all commercially reasonable efforts to
comply with the Securities Act and the Exchange Act in connection with the offer
and sale of the Registering Holders' Registrable Securities to be sold pursuant
to a registration statement, and, as soon as reasonably practicable following
the end of a fiscal year during which a registration statement effecting a
Registration of such Registrable Securities shall have been effective, to make
available to its security holders an earnings statement satisfying the
provisions of Section 11(a) of the Securities Act.

     (f)  The Company agrees to cooperate with the Registering Holders to
facilitate the timely preparation and delivery of certificates representing
their Registrable Securities to be sold pursuant to a Registration and not
bearing any Securities Act legend; and enable certificates for such Registrable
Securities to be issued for such numbers of shares and registered in such names
as such Holders may reasonably request at least two business days prior to any
sale of their Registrable Securities.

     (g)  The Company will enter into customary agreements (including an
underwriting agreement or securities sales agreement, if any, in customary form)
containing such representations and warranties to the Holders of such
Registrable Securities and the Underwriters, if any, in form, substance and
scope as are customarily made by issuers to underwriters in similar underwritten
offerings as may be reasonably requested by them and take such other actions as
are reasonably required in order to expedite or facilitate the disposition of
such Registrable Securities.

                                       8
<PAGE>

     (h)  The Company will make available for inspection by any Registering
Holder of such Registrable Securities, any Underwriter participating in any
disposition pursuant to such registration statement and any attorney, accountant
or other professional retained by any such Registering Holder or Underwriter
(collectively, the "Inspectors"), all financial and other records, pertinent
                    ----------
corporate documents and properties of the Company (collectively, the "Records")
                                                                      -------
as shall be reasonably necessary to enable them to exercise their due diligence
responsibility, and cause the Company's officers, directors and employees to
supply all information reasonably requested by any Inspectors in connection with
such registration statement. Records which the Company determines, in good
faith, to be confidential and which it notifies the Inspectors are confidential
shall not be disclosed by the Inspectors unless (i) the disclosure of such
registration statement or (ii) the release of such Records is ordered pursuant
to a subpoena or other order from a court of competent jurisdiction. Each
Registering Holder of such Registrable Securities agrees that information
obtained by it as a result of such inspections shall be deemed confidential and
shall not be used by it as the basis for any market transactions in the
securities of the Company or its Affiliates or otherwise disclosed by it unless
and until such is made generally available to the public. Each Registering
Holder of such Registrable Securities further agrees that it will, upon learning
that disclosure of such Records is sought in a court of competent jurisdiction,
give notice to the Company and allow the Company, at its expense, to undertake
appropriate action to prevent disclosure of the Records deemed confidential.

     (i)  The Company will furnish to each Registering Holder and to each
Underwriter, if any, a signed counterpart, addressed to such Registering Holder
or Underwriter, of (i) an opinion or opinions of counsel to the Company and (ii)
a comfort letter or comfort letters from the Company's independent public
accountants (to the extent permitted by the standards of the American Institute
of Certified Public Accountants), each in customary form and covering such
matters of the type customarily covered by opinions or comfort letters, as the
case may be, as the Holders of a majority of the Registrable Securities included
in such offering or the managing Underwriter or Underwriters therefor reasonably
request.

     (j)  The Company will otherwise use all commercially reasonable efforts to
comply with all applicable rules and regulations of the Commission and make
available to its securityholders, as soon as reasonably practicable, an earnings
statement covering a period of twelve (12) months, beginning within three (3)
months after the effective date of the registration statement, which earnings
statement shall satisfy the provisions of Section 11(a) of the Securities Act
and Rule 158 of the Commission promulgated thereunder (or any successor rule or
regulation hereafter adopted by the Commission).

     (k)  The Company will use all commercially reasonable efforts to cause all
such Registrable Securities to be listed on each securities exchange on which
similar securities issued by the Company are then listed.

     (l)  The Company will use all commercially reasonable efforts to obtain
CUSIP numbers for the Registrable Securities not later than the effective date
of the Registration.

                                       9
<PAGE>

     (m)  Each holder of Registrable Securities agrees that, prior to any
disposition of Registrable Securities pursuant to any Registration effected
pursuant to Section 2, such holder shall give at least 15 days prior written
notice of the desired disposition to the Company, including the anticipated date
thereof. The delivery by Registering Holders of requests for registration under
Section 2(b) shall satisfy the requirements of this Section 3(m).

     (n)  The Company shall file all reports required to be filed by it under
the Securities Act and the Exchange Act and the rules and regulations adopted by
the Commission thereunder and shall take such further action as any Holder may
reasonably request, all to the extent required to enable such Holders to sell
Registrable Securities pursuant to a registration statement on Form S-3 or any
similar registration form hereafter adopted by the Commission. Upon request, the
Company shall deliver to any Holder a written statement as to whether it has
complied with such requirements.

     Section 4.  Indemnification.
                 ---------------

     (a)  The Company will indemnify each Registering Holder, each such Holder's
officers and directors, and each person controlling such Holder within the
meaning of Section 15 of the Securities Act, against all claims, losses,
damages, liabilities and expenses (including reasonable legal expenses), arising
out of or based on any untrue statement (or alleged untrue statement) of a
material fact included or incorporated by reference in any registration
statement or prospectus relating to such Holders' Registrable Securities, or any
amendment or supplement thereto, or based on any omission (or alleged omission)
to state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading or any violation by the Company of
the Securities Act or any rule or regulation promulgated under the Securities
Act applicable to the Company in connection with any such registration;
provided, however, that the Company will not indemnify and will not be liable to
any Registered Holder in any such case to the extent that any such claim, loss,
damage, liability or expense arises out of or is based on any untrue statement
or omission or alleged untrue statement or omission, made in conformity with and
in reliance upon information furnished in writing to the Company by such Holder
for inclusion therein.

     (b)  Each Registering Holder will indemnify the Company, each of its
trustees and each of its officers who signs the registration statement, and each
person who controls the Company or such underwriter within the meaning of
Section 15 of the Securities Act, against all claims, losses, damages,
liabilities and expenses (including reasonable legal fees and expenses) arising
out of or based on any untrue statement (or alleged untrue statement) of a
material fact contained in any such registration statement or prospectus, or any
amendment or supplement thereto, or based on any omission (or alleged omission)
to state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading, in each case to the extent, but only
to the extent, that such untrue statement (or alleged untrue statement) or
omission (or alleged omission) is made in such registration statement or
prospectus, in reliance upon and in conformity with information furnished in
writing to the Company by such Holder for inclusion therein.

                                       10
<PAGE>

     (c)  Each party entitled to indemnification under this Section 4 (the
"Indemnified Party") shall give notice to the party required to provide
------------------
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
                      ------------------
has actual knowledge of any claim as to which indemnity may be sought. However,
the failure to so notify the Indemnifying Party shall not relieve the
Indemnifying Party from any liability which it may have to the Indemnified Party
pursuant to the provisions of this Section 4, except to the extent of the actual
damages suffered by such delay in notification. The Indemnifying Party shall
assume the defense of such action, including the employment of counsel, which
shall be chosen by the Indemnifying Party and shall be reasonably satisfactory
to the Indemnified Party, and payment of expenses in connection with such
defense. The Indemnified Party shall have the right to employ its own counsel in
any such case, but the legal fees and expenses of such counsel shall be at the
expense of the Indemnified Party unless (i) the employment of such counsel shall
have been authorized in writing by the Indemnifying Party, (ii) the Indemnifying
Party shall not have assumed the defense of such action within a reasonable
period of time, or (iii) the Indemnified Party shall have been reasonably
advised by its counsel that there may be defenses available to it or them which
are different from or additional to those available to Indemnifying Party (in
which case the Indemnifying Party shall not have the right to direct the defense
of such action on behalf of the Indemnified Party), in any of which events such
fees and expenses shall be borne by the Indemnifying Party. No Indemnifying
Party in the defense of any such claim or litigation, shall, except with the
consent of each Indemnified Party, consent to the entry of any judgment or enter
into any settlement that does not include as an unconditional term thereof the
giving by the claimant or plaintiff to each such Indemnified Party of a release
from all liability in respect to such claim or litigation.

     (d)  If the indemnification provided for in this Section 4 is unavailable
to a party that would have been an Indemnified Party under this Section 4, then
each party that would have been an Indemnifying Party hereunder shall, in lieu
of indemnifying such Indemnified Party, contribute to the amount paid or payable
by such Indemnified Party as a result of such claims, losses, damages,
liabilities and expenses in such proportion as is appropriate to reflect the
relative fault of the Indemnifying Party on the one hand and such Indemnified
Party on the other in connection with the statement or omission which resulted
in such claims, losses, damages, liabilities and expenses, as well as any other
relevant equitable considerations. The relative fault shall be determined by
reference to, among other things, whether the untrue or alleged untrue statement
of a material fact or the omission or alleged omission to state a material fact
related to information supplied by the Indemnifying Party or the Indemnified
Party and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission. The Company and
each Registering Holder agree that it would not be just and equitable if
contribution pursuant to this Section 4 were determined by pro rata allocation
or by any other method of allocation that fails to take account of the equitable
considerations referred to above in this Section 4(d).

     (e)  No person guilty of fraudulent misrepresentation (within the meaning
of Section 11(f) of the Securities Act) shall be entitled to contribution from
any person who was not guilty of such fraudulent misrepresentation.

                                       11
<PAGE>

     (f)  In no event shall any Registering Holder be liable for any claims,
losses, damages, liabilities or expenses pursuant to this Section 4 in excess of
the net proceeds to such Holder for the sale of such Holder's Registrable
Securities pursuant to an offering that is the subject of such claim, loss,
damage, liability or expense.

     Section 5. Expenses of Registrant. The Company shall pay all Registration
                ----------------------
Expenses incurred in connection with the registration, qualification or
compliance pursuant to Sections 2 and 3 hereof. All Selling Expenses incurred in
connection with the sale of Registrable Securities by any of the Registering
Holders shall be borne by such Holders. Each Registering Holder shall pay the
expenses of its own counsel other than those expenses that constitute
Registration Expenses.

     Section 6. Information to be Furnished by Holders. Each Registering Holder
                --------------------------------------
shall furnish to the Company such information as the Company may reasonably
request and as shall be required to be included in the registration statement in
connection with the Registration and related proceedings referred to in Section
2 or Section 3 hereof. If any Registering Holder fails to provide the Company
with such information within 10 days of receipt of the Company's request, the
Company's obligations under Section 2 or Section 3 hereof, as applicable, with
respect to such Holder or the Registrable Securities owned by such Holder shall
be suspended until such Holder provides such information.

     Section 7. Rule 144 Sales.
                --------------

     (a)  The Company covenants that it will file the reports required to be
filed by the Company under the Exchange Act, so as to enable any Holder to sell
Registrable Securities pursuant to Rule 144.

     (b)  In connection with any sale, transfer or other disposition by any
Holder of any Registrable Securities pursuant to Rule 144, the Company shall
cooperate with such Holder to facilitate the timely preparation and delivery of
certificates representing Registrable Securities to be sold, and the Company
shall prepare certificates for such Registrable Securities to be for such number
of shares and registered in such names as such Holder may reasonably request at
least two business days prior to any sale of Registrable Securities.

     Section 8. General
                -------

     (a)  Governing Law. THIS AGREEMENT SHALL BE GOVERNED IN ALL RESPECTS BY THE
          -------------
LAWS OF THE STATE OF TEXAS.

     (b)  Entire Agreement. This Agreement constitutes the full and entire
          ----------------
understanding and agreement between the parties with regard to the subject
matter hereof.

     (c)  Amendment. No supplement, modification, waiver or termination of this
          ---------
Agreement shall be binding unless executed in writing by the party to be bound
thereby.

                                       12
<PAGE>

     (d)  Notices. Each notice, demand, request, request for approval, consent,
          -------
approval, disapproval, designation or other communication (each of the foregoing
being referred to herein as a notice) required or desired to be given or made
under this Agreement shall be in writing (except as otherwise provided in this
Agreement), and shall be effective and deemed to have been received (i) when
delivered in person, (ii) when sent by fax with receipt acknowledged, (iii) five
(5) days after having been mailed by certified or registered United States mail,
postage prepaid, return receipt requested, or (iv) the next business day after
having been sent by a nationally-recognized overnight mail or courier service,
receipt requested. Notices shall be addressed as follows: (a) if to VEF III, at
VEF III's address or fax number set forth below its signature hereon, or at such
other address or fax number as VEF III shall have furnished to the Company in
writing, or (b) if to the Company, at the address of its principal executive
offices and addressed to the attention of the President, or at such other
address or fax number as the Company shall have furnished to VEF III or any
permitted assignee or transferee thereof. Any notice or other communication
required to be given hereunder to a Holder in connection with a registration may
instead be given to the designated representative of such Holder.

     (e)  Counterparts. This Agreement may be executed in any number of
          ------------
counterparts, each of which may be executed by fewer than all of the parties
hereto (provided that each party executes one or more counterparts), each of
which shall be enforceable against the parties actually executing such
counterparts, and all of which together shall constitute one instrument.

     (f)  Severability. In the event that any provision of this Agreement
          ------------
becomes or is declared by a court of competent jurisdiction to be illegal,
unenforceable or void, this Agreement shall continue in full force and effect
without said provision.

     (g)  Section Titles. Section titles are for descriptive purposes only and
          --------------
shall not control or alter the meaning of this Agreement as set forth in the
text.

     (h)  Successors and Assigns. The rights and obligations of VEF III
          ----------------------
hereunder may not be assigned except to a Permitted Assignee under the Venture
Agreement. This Agreement shall be binding upon the parties hereto and their
respective successors and permitted assigns.

     (i)  Remedies. The Company and VEF III acknowledge that there would be no
          --------
adequate remedy at law if any party fails to perform any of its obligations
hereunder, and accordingly agree that the Company and each Holder, in addition
to any other remedy to which it may be entitled at law or in equity, shall be
entitled to compel specific performance of the obligations of another party
under this Agreement in accordance with the terms and conditions of this
Agreement in any court of the United States or any State thereof having
jurisdiction.

     (j)  Attorneys' Fees. If the Company or any Holder brings an action to
          ---------------
enforce its rights under this Agreement, the prevailing party in the action
shall be entitled to recover its costs and expenses, including without
limitation, reasonable attorneys' fees, incurred in connection with such action,
including any appeal of such action.

     (k)  Authority; Binding Effect. Each party hereto represents and warrants
          --------------------------
that it has the full legal right, power and authority to execute this Agreement,
that this Agreement has been

                                       13
<PAGE>

duly authorized, executed and delivered on behalf of such party and constitutes
a valid and binding agreement of such party enforceable in accordance with its
terms.

                           [SIGNATURE PAGE FOLLOWS]

                                       14
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written

                                   PRENTISS PROPERTIES TRUST

                                   By: /s/ Thomas F. August
                                       -----------------------------------------
                                       Name: THOMAS F. AUGUST
                                             -----------------------------------
                                       Title:   PRESIDENT
                                              ----------------------------------

                                   VALUE ENHANCEMENT FUND III, LLC

                                   By: Lend Lease Real Estate Investments, Inc.
                                       Managing Member

                                       By:  /s/ George E. Chamblee III
                                            ------------------------------------
                                            George E. Chamblee III
                                            Executive Vice President

                                   ADDRESS:

                                   Value Enhancement Fund III, LLC
                                   Lend Lease Real Estate Investments, Inc.
                                   Suite 660
                                   8750 North Central Expressway
                                   Dallas, Texas 75231
                                   Attn: George E. Chamblee, III

                                   with a copy to:

                                   Value Enhancement Fund III, LLC
                                   c/o Lend Lease Real Estate Investments, Inc.
                                   Suite 800
                                   3424 Peachtree Road, N.E.
                                   Atlanta, Georgia 30326
                                   Attn: James P. Ryan

                                       15

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