Document:

<PAGE>

                                                                   EXHIBIT 10.10

                                 FIRST AMENDMENT
                                       TO
                          THE PRENTISS PROPERTIES TRUST
                            1996 SHARE INCENTIVE PLAN

         This First Amendment to the Prentiss Properties Trust 1996 Share
Incentive Plan (the "Plan"), hereby amends the Plan as follows effective as of
May 6, 1997:

         1. Section 5.01 which describes the maximum aggregate number of shares
issuable under the Plan, is hereby amended by deleting the fourth sentence and
inserting in its place the following sentence:

         "The maximum aggregate number of Shares that may be issued under this
         Plan is 2,980,000 Shares, subject to increase and adjustment as
         provided in this Article V and Article XII."

         2. As amended by the foregoing, the Plan shall remain in full force and
effect.

Dated: February 10, 1998

                                     PRENTISS PROPERTIES TRUST

                                     By: /s/ Thomas F. August
                                         -------------------------------------
                                         Thomas F. August
                                         President and Chief Operating Officer<PAGE>

                                                                   EXHIBIT 10.11

                                SECOND AMENDMENT
                                       TO
                          THE PRENTISS PROPERTIES TRUST
                            1996 SHARE INCENTIVE PLAN

         This Second Amendment to the Prentiss Properties Trust 1996 Share
Incentive Plan (the "Plan") as amended by the First Amendment to the Plan, dated
effective as of May 6, 1997, hereby amends the Plan as follows effective as of
May 5, 1998:

         1. Section 5.01 which describes the maximum aggregate number of shares
issuable under the Plan, is hereby amended by deleting the fourth sentence and
inserting in its place the following sentence:

         "The maximum aggregate number of Shares that may be issued under this
         Plan is 4,500,000 Shares, subject to increase and adjustment as
         provided in this Article V and Article XII."

         2. As amended by the foregoing, the Plan shall remain in full force and
effect.

Dated: February 10, 1998

                                      PRENTISS PROPERTIES TRUST

                                      By: /s/ Thomas F. August
                                          -------------------------------------
                                          Thomas F. August
                                          President and Chief Operating Officer<PAGE>

                                                                   EXHIBIT 10.12

                                 AMENDMENT NO. 3
                                     TO THE
                            PRENTISS PROPERTIES TRUST
                            1996 SHARE INCENTIVE PLAN

     This Third Amendment to the Prentiss Properties Trust 1996 Share Incentive
Plan (the "Plan") as amended by the First Amendment to the Plan, dated effective
as of May 6, 1997, and the Second Amendment to the Plan, dated effective as of
May 5, 1998, hereby amends the Plan as follows effective as of May 9, 2001:

     1.   Section 5.01 which describes the maximum aggregate number of shares
          issuable under the Plan, is hereby amended by deleting the fourth
          sentence and inserting in its place the following sentence:

          "The maximum aggregate number of Shares that may be issued under this
          Plan is 5,000,000 Shares, subject to increase and adjustment as
          provided in this Article V and Article XII."

     2.   As amended by the foregoing, the Plan shall remain in full force and
          effect.

Dated:  May 9, 2001

                                 PRENTISS PROPERTIES TRUST

                                 By:  /s/ Thomas F. August
                                      -----------------------------------------
                                      Thomas F. August
                                      President and Chief Executive Officer<PAGE>

                                                                   EXHIBIT 10.13

                             FOURTH AMENDMENT TO THE
                            PRENTISS PROPERTIES TRUST
                            1996 SHARE INCENTIVE PLAN

         This Fourth Amendment to the Prentiss Properties Trust 1996 Share
Incentive Plan (the "Plan") as previously amended by the First through the Third
Amendments to the Plan, hereby amends the Plan effective as of October 15, 1996
in the following respects:

         1.       Section 8.02 of the Plan is hereby amended by the addition at
the end thereof of the following language:

         Attestation to the ownership of Shares or the assignment thereof to pay
         the exercise price and taxes shall be at the sole discretion of the
         Company. The Participant shall have no right to require the Company to
         accept payment in the form of shares. The Company may reject the
         attestation or assignment for any reason or no reason.

         The form of the attestation or assignment shall be on a form acceptable
         to the Company in any and all respects.

         Attestation to the ownership of Shares and the assignment thereof may
         be treated as the surrender of Shares under rules and procedures
         established by the Administrator. Any Shares surrendered, or attested
         to, must have been held by the surrendering Participant for more than
         six months, (or for any period required by the Company) and neither the
         surrender, or attestation to the ownership, of Shares shall be
         permitted if such action would cause the Company to recognize
         compensation expense (or additional compensation expense) with respect
         to the Option for financial reporting purposes.

         Any attempt to surrender shares, or any shares surrendered, or attested
         to, for any purpose, including payment of the Exercise Price and or
         taxes will be void AB INITIO, if such action would cause the Company to
         recognize compensation expense (or additional compensation expense)
         with respect to the Option for financial reporting purposes.

         Attestation to the ownership of Shares or the assignment thereof, may
         be only for the minimum number of Shares required to pay the exercise
         price and the minimum statutory taxes. Amounts in excess will be void
         AB INITIO

         2.       As amended by the foregoing, the Plan shall remain in full
force and effect.

Dated: May 9, 2001

                                  PRENTISS PROPERTIES TRUST

                                  By:  /s/ Thomas F. August
                                       -----------------------------------------
                                       Thomas F. August
                                       President and Chief Executive Officer<PAGE>

                                                                   EXHIBIT 10.14

                               AMENDMENT NO. 5 TO
                          THE PRENTISS PROPERTIES TRUST
                            1996 SHARE INCENTIVE PLAN

                             AS OF OCTOBER 23, 2002

         This Amendment by Prentiss Properties Trust to the Prentiss Properties
Trust 1996 Share Incentive Plan (the "Plan"), made pursuant to the right to
amend reserved in Article XV of the Plan, amends and modifies the Plan as
follows:

         1. The following shall be added to the end of Article III:

         "Notwithstanding the above or anything in this Plan to the contrary,
except as provided in Article XII, the Administrator shall not have the power to
adjust the price per share of Shares purchased on the exercise of an Option, or
the Initial Value of a SAR, without the consent of the Company's shareholders."

         2.       The final sentence of Section 8.02 shall be deleted in its
entirety and replaced with the following:

         "If Shares are used to pay all or part of the Option price, any Shares
surrendered (a) must have an aggregate Fair Market Value (determined as of the
day preceding the date of exercise) that, together with any cash or cash
equivalent paid, is not less than the Option price for the number of Shares for
which the Option is being exercised and (b) must have been held by the
Participant for at least six (6) months prior to exercise (or such longer or
shorter period as may be required to avoid a charge to earnings for financial
accounting purposes)."

         3. In all other respects, the Plan shall remain unchanged and in full
force and effect.

         IN WITNESS WHEREOF, the foregoing Amendment is hereby duly executed by
the corporate officer signing below on October 23, 2002.

                                       PRENTISS PROPERTIES TRUST

                                       By: /s/ Thomas F. August
                                          --------------------------------------
                                          Thomas F. August
                                          President and Chief Executive Officer<PAGE>

                                                                   EXHIBIT 10.15

                             SIXTH AMENDMENT TO THE

                            PRENTISS PROPERTIES TRUST

                            1996 SHARE INCENTIVE PLAN

This Sixth Amendment to the Prentiss Properties Trust 1996 Share Incentive Plan
(the "Plan") as amended by the First Amendment to the Plan, dated effective as
of May 6, 1997, the Second Amendment to the Plan, dated effective as of May 5,
1998, the Third Amendment to the Plan dated effective as of May 9, 2001, the
Fourth Amendment to the Plan dated effective as of October 15, 1996, and the
Fifth Amendment to the Plan dated effective as of October 23, 2002, hereby
amends the Plan as follows effective as of May 5, 2004:

1. Section 5.01 which describes the maximum aggregate number of shares issuable
under the Plan, is hereby amended by deleting the fourth sentence and inserting
in its place the following sentence:

"The maximum aggregate number of Shares that may be issued under this Plan is
6,500,000 Shares, subject to increase and adjustment as provided in this Article
V and Article XII."

2. As amended by the foregoing, the Plan shall remain in full force and effect.

Dated: May 5, 2004

PRENTISS PROPERTIES TRUST

By:    /S/    THOMAS F. AUGUST
    Thomas F. August
    President and Chief Executive Officer

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00096-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00096-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00096-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00096-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00096-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00096-of-00352.parquet"}]]