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                                                                   EXHIBIT 10.12

                              AMB PROPERTY II, L.P.
                               SECOND AMENDMENT TO
                           TENTH AMENDED AND RESTATED
                        AGREEMENT OF LIMITED PARTNERSHIP

           This Second Amendment (this "Amendment") is made as of February 25,
2002, by AMB PROPERTY HOLDING CORPORATION, a Maryland corporation, as general
partner (the "General Partner") of AMB PROPERTY II, L.P., a Delaware limited
partnership (the "Partnership"), and as attorney-in fact for each of the limited
partners of the Partnership (collectively, the "Limited Partners") for the
purpose of amending the Tenth Amended and Restated Agreement of Limited
Partnership of the Partnership dated as of December 6, 2001, as amended by the
First Amendment to Tenth Amended and Restated Agreement of Limited Partnership
dated as of January 1, 2002 (as amended, the "Partnership Agreement"). All
defined terms used herein but not defined herein have the meanings assigned to
them in the Partnership Agreement.

                     WHEREAS, pursuant to Section 7.3D(iv) of the Partnership
Agreement, the General Partner may, without the consent of the other partners,
amend the Partnership Agreement to reflect a change that is of an
inconsequential nature and does not adversely affect the Limited Partners in any
material respect, or to cure any ambiguity in, correct or supplement any
provision;

                     WHEREAS, pursuant to the authority granted under the
Partnership Agreement, the General Partner desires to amend the Partnership
Agreement to correct a typographical error with respect to the date after which
the Series G Preferred Units may be redeemed.

           NOW THEREFORE, pursuant to Section 7.3D of the Partnership Agreement,
the General Partner, on its own behalf and as attorney-in-fact for the Limited
Partners, hereby amends the Partnership Agreement as follows:

           SECTION 1. Amendment to Section 20.5.A of the Partnership Agreement.

                     The first sentence of Section 20.5.A of the Partnership
Agreement is deleted in its entirety and replaced with the following:

                     "The Series G Preferred Units may not be redeemed prior to
August 29, 2005."

           SECTION 2. Miscellaneous.

                     2.1 Governing Law. This Amendment shall be construed under
and governed by the internal laws of the State of Delaware without regard to its
conflict of laws provisions.

           SECTION 3. Partnership Agreement. The Partnership Agreement and this
Amendment shall be read together and shall have the same effect as if the
provisions of the Partnership Agreement and this Amendment were contained in one
document. Any provisions of the Partnership Agreement not amended by this
Amendment shall remain in full force and effect as provided in the Partnership
Agreement immediately prior to the date hereof.

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        IN WITNESS WHEREOF the parties hereto have caused this Amendment to be
executed as of the date set forth above by their duly authorized
representatives.

                              GENERAL PARTNER:

                              AMB PROPERTY HOLDING CORPORATION,
                              a Maryland corporation

                              By:  /s/ Michael A. Coke
                                 -----------------------------------------------
                                   Michael A. Coke
                                   Executive Vice President and Chief Financial
                                   Officer

                              COMMON LIMITED PARTNER:

                              AMB PROPERTY, L.P., a Delaware limited partnership

                              By:  AMB Property Corporation,
                                   its general partner

                              By:  /s/ Michael A. Coke
                                 -----------------------------------------------
                                   Michael A. Coke
                                   Executive Vice President and Chief Financial
                                   Officer

                              GENERAL PARTNER OF COMMON LIMITED PARTNER:

                              AMB PROPERTY CORPORATION,
                              a Maryland corporation

                              By:  /s/ Michael A. Coke
                                 -----------------------------------------------
                                   Michael A. Coke
                                   Executive Vice President and Chief Financial
                                   Officer

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                              LIMITED PARTNERS:

                              By:  AMB PROPERTY HOLDING CORPORATION,
                                   a Maryland corporation, as attorney-in-fact
                                   for each of the Limited Partners

                              By:  /s/ Michael A. Coke
                                 -----------------------------------------------
                                   Michael A. Coke
                                   Executive Vice President and Chief Financial
                                   Officer<PAGE>
                                                                  EXHIBIT 10.20

                                 AMENDMENT NO. 1

                                     TO THE

         THIRD AMENDED AND RESTATED 1997 STOCK OPTION AND INCENTIVE PLAN

                                       OF

                            AMB PROPERTY CORPORATION

                              AND ITS SUBSIDIARIES

        AMB Property Corporation, a corporation organized under the laws of
State of Maryland (the "Company"), hereby adopts this Amendment No. 1 (this
"Amendment") to the Third Amended and Restated 1997 Stock Option and Incentive
Plan of AMB Property Corporation and its Subsidiaries (the "Plan"). Capitalized
terms used in this Amendment without definition shall have the meanings given to
such terms in the Plan.

        WHEREAS, Section 9.2 of the Plan currently provides that the full Board
of Directors of the Company, acting by a majority of its members in office,
shall conduct the general administration of the Plan with respect to Options
granted to Independent Directors;

        WHEREAS, Section 10.1 of the Plan currently provides that awards under
the Plan are not transferable in any manner other than by will or the laws of
descent and distribution; and

        WHEREAS, the Company's Board of Directors has determined that it is in
the best interests of the Company to amend the Plan in certain respects to (i)
permit the Committee to modify any outstanding Options granted to Independent
Directors and (ii) permit the transferability of awards under the Plan, other
than Incentive Stock Options, with the consent of the Committee or by gift to
family members of the award holder and entities owned by such family members.

        NOW, THEREFORE, the Plan is hereby amended as follows:

               1. Section 9.2. Section 9.2 of the Plan is hereby deleted and
replaced to read in its entirety as follows:

                      "9.2. Duties and Powers of Committee. It shall be the duty
of the Committee to conduct the general administration of this Plan in
accordance with its provisions. The Committee shall have the power to interpret
this Plan and the agreements pursuant to which Options, awards of Restricted
Stock or Deferred Stock, Performance Awards, Stock Appreciation Rights, Dividend
Equivalents or Stock Payments are granted or awarded, and to adopt such rules
for the administration, interpretation, and application of this Plan as are
consistent therewith and to interpret, amend or revoke any such rules; provided,
however, that only the full Board, acting by a majority of its members in
office, shall have the power to grant

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Options to Independent Directors. Any such grant or award under this Plan need
not be the same with respect to each Optionee, Grantee or Restricted
Stockholder. Any such interpretations and rules with respect to Incentive Stock
Options shall be consistent with the provisions of Section 422 of the Code. In
its absolute discretion, the Board may at any time and from time to time
exercise any and all rights and duties of the Committee under this Plan except
with respect to matters which under Rule 16b-3 or Section 162(m) of the Code, or
any regulations or rules issued thereunder, are required to be determined in the
sole discretion of the Committee."

               2. Section 10.1. Section 10.1 of the Plan is hereby deleted and
replaced to read in its entirety as follows:

                      "10.1. Not Transferable. Options, Restricted Stock awards,
Deferred Stock awards, Performance Awards, Stock Appreciation Rights, Dividend
Equivalents or Stock Payments under this Plan may not be sold, pledged,
assigned, or transferred in any manner other than by will or the laws of descent
and distribution or pursuant to a qualified domestic relations order as defined
by the Code or Title I of the Employee Retirement Income Security Act of 1974,
as amended, or the rules thereunder (a "QDRO"), unless and until such rights or
awards have been exercised, or the shares underlying such rights or awards have
been issued, and all restrictions applicable to such shares have lapsed;
provided, however, that Non-Qualified Stock Options, Restricted Stock awards,
Deferred Stock awards, Performance Awards, Stock Appreciation Rights, Dividend
Equivalents and Stock Payments may be transferred with the consent of the
Committee or by gift to a "Family Member" (as defined below), in which case the
transferee shall receive and hold the Option or other award so transferred
subject to the provisions of this Plan and the agreement governing such Option
or other award; provided, further, that a transfer of a Non-Qualified Stock
Option, Restricted Stock award, Deferred Stock award, Performance Award, Stock
Appreciation Right, Dividend Equivalent or Stock Payment to an entity in which
more than fifty percent (50%) of the voting interests are owned by Family
Members (or the Optionee, Grantee or Restricted Stockholder) in exchange for an
interest in that entity shall be considered a gift of such Option or other
award. No Option, Restricted Stock award, Deferred Stock award, Performance
Award, Stock Appreciation Right, Dividend Equivalent or Stock Payment or
interest or right therein shall be liable for the debts, contracts or
engagements of the Optionee, Grantee or Restricted Stockholder or his successors
in interest or shall be subject to disposition by transfer, alienation,
anticipation, pledge, encumbrance, assignment or any other means whether such
disposition be voluntary or involuntary or by operation of law by judgment,
levy, attachment, garnishment or any other legal or equitable proceedings
(including bankruptcy), and any attempted disposition thereof shall be null and
void and of no effect, except to the extent that such disposition is permitted
by the preceding sentence.

        For purposes of this Section 10.1, the term "Family Member" shall mean
any child, stepchild, grandchild, parent, stepparent, grandparent, spouse,
former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law,
daughter-in-law, brother-in-law, or sister-in-law, including adoptive
relationships, any person sharing the Optionee's, Grantee's or Restricted
Stockholder's household (other than a tenant or an employee), a trust in which
these persons have more than fifty percent (50%) of the beneficial interest, a
foundation in which these persons

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(or the Optionee, Grantee or Restricted Stockholder) control the management of
the assets, and any other entity in which these persons (or the Optionee,
Grantee or Restricted Stockholder) own more than fifty percent (50%) of the
voting interests.

        During the lifetime of the Optionee or Grantee, only he may exercise an
Option or other right or award (or any portion thereof) granted to him under the
Plan unless it has been transferred with the consent of the Committee or
pursuant to a QDRO or by gift to a Family Member, in which case the transferee
may exercise such Option or other award. Unless previously transferred as
permitted by this Section 10.1, after the death of the Optionee or Grantee, any
exercisable portion of an Option or other right or award may, prior to the time
when such portion becomes unexercisable under the Plan or the applicable Stock
Option Agreement or other agreement, be exercised by his personal representative
or by any person empowered to do so under the deceased Optionee's or Grantee's
will or under the then applicable laws of descent and distribution."

                            (SIGNATURE PAGE FOLLOWS)

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        I hereby certify that the foregoing Amendment to the Plan was duly
adopted by the Board of Directors of AMB Property Corporation effective as of
February 15, 2002.

        Executed on this 15th day of February, 2002.

                                                  /s/ Tamra D. Browne
                                        ---------------------------------------
                                        Secretary

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