SPIEKER PROPERTIES L P
8-K, 1998-01-30
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                       January 30, 1998 (December 3, 1998)
                       -----------------------------------
                Date of Report (Date of Earliest Event Reported)

                            SPIEKER PROPERTIES, L.P.
                            ------------------------
             (Exact Name of Registrant As Specified In Its Charter)

                                   CALIFORNIA
                                   ----------
         (State or Other Jurisdiction of Incorporation or Organization)

             33-98372-01                               94-3188774
             -----------                               ----------
      (Commission File Number)              (IRS Employer Identification No.)

                               2180 Sand Hill Road
                          Menlo Park, California 94025
                          ----------------------------
               (Address of Principal Executive Offices)(Zip Code)

                                 (650) 854-5600
                                 --------------
              (Registrant's Telephone Number, including Area Code)


                                        1

<PAGE>   2

Item 7.  Financial Statements, Pro forma Financial Statements and Exhibits.

      (c)   Exhibits.

      The Registrant hereby files the following exhibits to its Registration
Statement on Form S-3 (No. 333-35997), which was declared effective on October
1, 1997:

<TABLE>
<CAPTION>
Exhibit
Number      Description
- --------    -----------
<S>         <C>
1.1         Pricing Agreement, dated January 22, 1998, in connection with the
            offering of $150,000,000 of 6.75% Notes Due January 15, 2008.

1.2         Pricing Agreement, dated January 28, 1998, in connection with the
            offering of $125,000,000 of 6.875% Notes Due February 1, 2005.

1.3         Pricing Agreement, dated January 28, 1998, in connection with the
            offering of $1,500,000 of 7% Notes Due February 1, 2007.

4.13        Tenth Supplemental Indenture relating to the 7.35% Debentures due
            December 1, 2017, including a specimen of such Debenture

4.14        Eleventh Supplemental Indenture relating to the 6.75% Notes Due
            January 15, 2008, including a specimen of such Note

4.15        Twelfth Supplemental Indenture relating to the 6.875% Notes
            Due February 1, 2005, including a specimen of such Note

4.16        Thirteenth Supplemental Indenture relating to the 7% Notes
            Due February 1, 2007, including a specimen of such Note
</TABLE>


                                        2

<PAGE>   3
                                    SIGNATURE

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunder duly authorized.

Dated: January 30, 1998

                                          SPIEKER PROPERTIES, L.P.

                                          By:  Spieker Properties, Inc. as
                                                General Partner

                                    By:   /s/    Craig G. Vought
                                          --------------------------------------
                                          Name:  Craig G. Vought
                                          Title: Executive Vice President and
                                                 Chief Financial Officer


                                        3

<PAGE>   1
                                                                     EXHIBIT 1.1


                                PRICING AGREEMENT

                                                                January 22, 1998

Goldman, Sachs & Co.,
Merrill Lynch, Pierce, Fenner & Smith
      Incorporated,
J.P. Morgan Securities Inc.,
Morgan Stanley & Co. Incorporated,
c/o Goldman, Sachs & Co.,
85 Broad Street,
New York, New York 10004.

Ladies and Gentlemen:

     Spieker Properties, L.P., a California limited partnership (the "Operating
Partnership"), proposes, subject to the terms and conditions stated herein and
in the Underwriting Agreement, dated September 24, 1997 (the "Underwriting
Agreement"), between the Operating Partnership and Spieker Properties, Inc., a
Maryland corporation (the "Company"), on the one hand and Goldman, Sachs & Co.,
Merrill Lynch, Pierce, Fenner & Smith Incorporated, J.P. Morgan Securities Inc.
and Morgan Stanley & Co. Incorporated, on the other hand, to issue and sell to
the Underwriters named in Schedule I hereto (the "Underwriters") the Securities
specified in Schedule II hereto (the "Designated Securities"). Each of the
provisions of the Underwriting Agreement is incorporated herein by reference in
its entirety, and shall be deemed to be a part of this Agreement to the same
extent as if such provisions had been set forth in full herein; and each of the
representations and warranties set forth therein shall be deemed to have been
made at and as of the date of this Pricing Agreement, except that each
representation and warranty which refers to the Prospectus in Section 2 of the
Underwriting Agreement shall be deemed to be a representation or warranty as of
the date of the Underwriting Agreement in relation to the Prospectus (as therein
defined), and also a representation and warranty as of the date of this Pricing
Agreement in relation to the Prospectus as amended or supplemented relating to
the Designated Securities which are the subject of this Pricing Agreement. Each
reference to the Representatives herein and in the provisions of the
Underwriting Agreement so incorporated by reference shall be deemed to refer to
you. Unless otherwise defined herein, terms defined in the Underwriting
Agreement are used herein as therein defined. The Representatives designated to
act on behalf of the Representatives and on behalf of each of the Underwriters
of the Designated Securities pursuant to Section 12 of the Underwriting
Agreement and the address of the Representatives referred to in such Section 12
are set forth in Schedule II hereto.

     An amendment to the Registration Statement, or a supplement to the
Prospectus, as the case may be, relating to the Designated Securities, in the
form heretofore delivered to you is now proposed to be filed with the
Commission.

<PAGE>   2

     Subject to the terms and conditions set forth herein and in the
Underwriting Agreement incorporated herein by reference, the Operating
Partnership agrees to issue and sell to each of the Underwriters, and each of
the Underwriters agrees, severally and not jointly, to purchase from the
Operating Partnership, at the time and place and at the purchase price to the
Underwriters set forth in Schedule II hereto, the principal amount of Designated
Securities set forth opposite the name of such Underwriter in Schedule I hereto.

     If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof, and upon acceptance hereof by you, on
behalf of each of the Underwriters, this letter and such acceptance hereof,
including the provisions of the Underwriting Agreement incorporated herein by
reference, shall constitute a binding agreement between each of the Underwriters
and the Company and the Operating Partnership. It is understood that your
acceptance of this letter on behalf of each of the Underwriters is or will be
pursuant to the authority set forth in a form of Agreement among Underwriters,
the form of which shall be submitted to the Operating Partnership for
examination, upon request, but without warranty on the part of the
Representatives as to the authority of the signers thereof.

                           Very truly yours,

                           SPIEKER PROPERTIES, L.P.

                           By:   SPIEKER PROPERTIES, INC.  

                                 By: /s/    Craig G. Vought 
                                     -------------------------------------------
                                     Name:  Craig G. Vought 
                                     Title: Executive Vice President
                                              and Chief Financial Officer

                           SPIEKER PROPERTIES, INC.  

                                 By: /s/    Craig G. Vought 
                                     -------------------------------------------
                                     Name:  Craig G. Vought 
                                     Title: Executive Vice President
                                              and Chief Financial Officer

Accepted as of the date hereof:

Goldman, Sachs & Co.                               
Merrill Lynch, Pierce, Fenner & Smith Incorporated 
J. P. Morgan Securities Inc.
Morgan Stanley & Co. Incorporated

By: /s/ Goldman, Sachs & Co.
    ---------------------------------
    (Goldman, Sachs & Co.)


                                        2

<PAGE>   3

                                   SCHEDULE I

<TABLE>
<CAPTION>
                                                             PRINCIPAL AMOUNT OF
                                                            DESIGNATED SECURITIES
   UNDERWRITER                                                 TO BE PURCHASED
   -----------                                              ---------------------
<S>                                                         <C>         
Goldman, Sachs & Co.....................................           $90,000,000 
J.P. Morgan Securities Inc..............................            20,000,000 
Merrill Lynch, Pierce, Fenner &                                                
Smith Incorporated......................................            20,000,000 
Morgan Stanley & Co. Incorporated ......................            20,000,000 
                                                                  ------------
Total...................................................          $150,000,000
                                                                  ============
</TABLE>


                                        3

<PAGE>   4

                                   SCHEDULE II

TITLE OF DESIGNATED SECURITIES:

    6.75% Notes due January 15, 2008

AGGREGATE PRINCIPAL AMOUNT:

    $150,000,000

INITIAL OFFERING PRICE TO PUBLIC:

    99.71% plus accrued interest, if any, from January 27, 1998.

PURCHASE PRICE BY UNDERWRITERS:

    99.06% plus accrued interest, if any, from January 27, 1998.

FORM OF DESIGNATED SECURITIES:

    Global Form

SPECIFIED FUNDS FOR PAYMENT OF PURCHASE PRICE:

    Same day funds

TIME OF DELIVERY:

    9:30 a.m. (New York City time), January 27, 1998

INDENTURE:

    Indenture dated December 6, 1995, among the Operating Partnership, the
    Company and State Street Bank and Trust, as Trustee, as supplemented by the
    Eleventh Supplemental Indenture with First Trust of California, National
    Association as Trustee

MATURITY:

    January 15, 2008

INTEREST RATE:

    6.75%


                                        4

<PAGE>   5

INTEREST PAYMENT DATES:

    January 15 and July 15, beginning July 15, 1998.

REDEMPTION PROVISION:

    The Notes may be redeemed at any time at the option of the Operating
    Partnership, in whole or from time to time in part, at a redemption price
    equal to the sum of (i) the principal amount of the Notes being redeemed
    plus accrued interest thereon to the redemption date and (ii) the Make-Whole
    Amount, if any, with respect to such Notes.

CLOSING LOCATION:

    Sullivan & Cromwell
    444 South Flower Street
    Los Angeles, California  90071

NAMES AND ADDRESSES OF REPRESENTATIVES:

    Designated Representatives:

        Goldman, Sachs & Co., Merrill Lynch, Pierce, Fenner & Smith
        Incorporated, J.P. Morgan Securities Inc. and Morgan Stanley & Co.
        Incorporated

    Address for Notices, etc.:

        Goldman, Sachs & Co.
        85 Broad Street
        New York, New York  10004

CAPTIONS OF PROSPECTUS:

    "Description of Notes"


                                        5


<PAGE>   1
                                                                     EXHIBIT 1.2


                                PRICING AGREEMENT

                                                                January 28, 1998

Morgan Stanley & Co. Incorporated,
Goldman, Sachs & Co.,
Merrill Lynch, Pierce, Fenner & Smith
      Incorporated,
J.P. Morgan Securities Inc.,
c/o Morgan Stanley & Co. Incorporated,
1585 Broadway,
New York, New York 10036

Ladies and Gentlemen:

     Spieker Properties, L.P., a California limited partnership (the "Operating
Partnership"), proposes, subject to the terms and conditions stated herein and
in the Underwriting Agreement, dated September 24, 1997 (the "Underwriting
Agreement"), between the Operating Partnership and Spieker Properties, Inc., a
Maryland corporation (the "Company"), on the one hand and Goldman, Sachs & Co.,
Merrill Lynch, Pierce, Fenner & Smith Incorporated, J.P. Morgan Securities Inc.
and Morgan Stanley & Co. Incorporated, on the other hand, to issue and sell to
the Underwriters named in Schedule I hereto (the "Underwriters") the Securities
specified in Schedule II hereto (the "Designated Securities"). Each of the
provisions of the Underwriting Agreement is incorporated herein by reference in
its entirety, and shall be deemed to be a part of this Agreement to the same
extent as if such provisions had been set forth in full herein; and each of the
representations and warranties set forth therein shall be deemed to have been
made at and as of the date of this Pricing Agreement, except that each
representation and warranty which refers to the Prospectus in Section 2 of the
Underwriting Agreement shall be deemed to be a representation or warranty as of
the date of the Underwriting Agreement in relation to the Prospectus (as therein
defined), and also a representation and warranty as of the date of this Pricing
Agreement in relation to the Prospectus as amended or supplemented relating to
the Designated Securities which are the subject of this Pricing Agreement. Each
reference to the Representatives herein and in the provisions of the
Underwriting Agreement so incorporated by reference shall be deemed to refer to
you. Unless otherwise defined herein, terms defined in the Underwriting
Agreement are used herein as therein defined. The Representatives designated to
act on behalf of the Representatives and on behalf of each of the Underwriters
of the Designated Securities pursuant to Section 12 of the Underwriting
Agreement and the address of the Representatives referred to in such Section 12
are set forth in Schedule II hereto.

     An amendment to the Registration Statement, or a supplement to the
Prospectus, as the case may be, relating to the Designated Securities, in the
form heretofore delivered to you is now proposed to be filed with the
Commission.

<PAGE>   2

     Subject to the terms and conditions set forth herein and in the
Underwriting Agreement incorporated herein by reference, the Operating
Partnership agrees to issue and sell to each of the Underwriters, and each of
the Underwriters agrees, severally and not jointly, to purchase from the
Operating Partnership, at the time and place and at the purchase price to the
Underwriters set forth in Schedule II hereto, the principal amount of Designated
Securities set forth opposite the name of such Underwriter in Schedule I hereto.

     If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof, and upon acceptance hereof by you, on
behalf of each of the Underwriters, this letter and such acceptance hereof,
including the provisions of the Underwriting Agreement incorporated herein by
reference, shall constitute a binding agreement between each of the Underwriters
and the Company and the Operating Partnership. It is understood that your
acceptance of this letter on behalf of each of the Underwriters is or will be
pursuant to the authority set forth in a form of Agreement among Underwriters,
the form of which shall be submitted to the Operating Partnership for
examination, upon request, but without warranty on the part of the
Representatives as to the authority of the signers thereof.

                           Very truly yours,

                           SPIEKER PROPERTIES, L.P.

                           By:   SPIEKER PROPERTIES, INC.  

                                 By: /s/    Craig G. Vought 
                                     -------------------------------------------
                                     Name:  Craig G. Vought 
                                     Title: Executive Vice President
                                              and Chief Financial Officer

                           SPIEKER PROPERTIES, INC.  

                                 By: /s/    Craig G. Vought 
                                     -------------------------------------------
                                     Name:  Craig G. Vought 
                                     Title: Executive Vice President
                                              and Chief Financial Officer

Accepted as of the date hereof:

Morgan Stanley & Co. Incorporated
Goldman, Sachs & Co.                               
Merrill Lynch, Pierce, Fenner & Smith Incorporated 
J. P. Morgan Securities Inc.

By: /s/ Hal Hendershot III
    ---------------------------------


                                        2

<PAGE>   3

                                   SCHEDULE I

<TABLE>
<CAPTION>
                                                               PRINCIPAL AMOUNT OF
                                                              DESIGNATED SECURITIES
           UNDERWRITER                                           TO BE PURCHASED
        -----------------                                     ---------------------
<S>                                                           <C>
Morgan Stanley & Co. Incorporated ..........................       $ 75,000,000
Goldman, Sachs & Co.........................................         16,667,000
Merrill Lynch, Pierce, Fenner &                                      16,667,000
Smith Incorporated..........................................
J.P. Morgan Securities Inc..................................         16,666,000
                                                                   ------------
Total.......................................................       $125,000,000
                                                                   =============
</TABLE>


                                        3

<PAGE>   4

                                   SCHEDULE II

TITLE OF DESIGNATED SECURITIES:

    6.875% Notes Due February 1, 2005

AGGREGATE PRINCIPAL AMOUNT:

    $125,000,000

INITIAL OFFERING PRICE TO PUBLIC:

    100% plus accrued interest, if any, from February 2, 1998.

PURCHASE PRICE BY UNDERWRITERS:

    99.375% plus accrued interest, if any, from February 2, 1998.

FORM OF DESIGNATED SECURITIES:

    Global Form

SPECIFIED FUNDS FOR PAYMENT OF PURCHASE PRICE:

    Same day funds

TIME OF DELIVERY:

    9:30 a.m. (New York City time), February 2, 1998

INDENTURE:

    Indenture dated December 6, 1995, among the Operating Partnership, the
    Company and State Street Bank and Trust, as Trustee, as supplemented by the
    Twelfth Supplemental Indenture with First Trust of California, National
    Association as Trustee

MATURITY:

    February 1, 2005

INTEREST RATE:

    6.875%


                                        4

<PAGE>   5

INTEREST PAYMENT DATES:

    February 1 and August 1, beginning August 1, 1998.

REDEMPTION PROVISION:

    The Notes may be redeemed at any time at the option of the Operating
    Partnership, in whole or from time to time in part, at a redemption price
    equal to the sum of (i) the principal amount of the Notes being redeemed
    plus accrued interest thereon to the redemption date and (ii) the Make-Whole
    Amount, if any, with respect to such Notes.

CLOSING LOCATION:

    Sullivan & Cromwell
    444 South Flower Street
    Los Angeles, California  90071

NAMES AND ADDRESSES OF REPRESENTATIVES:

    Designated Representatives:

        Morgan Stanley & Co. Incorporated, Goldman, Sachs & Co., Merrill Lynch,
        Pierce, Fenner & Smith Incorporated and J.P. Morgan Securities Inc.

    Address for Notices, etc.:

        Morgan Stanley & Co. Incorporated
        1585 Broadway -- 2nd Floor
        New York, New York  10036
        Attn:  Medium-Term Note Trading Desk, Carlos Cabrera

CAPTIONS OF PROSPECTUS:

    "Description of Notes"


                                        5

<PAGE>   1
                                                                     EXHIBIT 1.3


                                PRICING AGREEMENT

                                                                January 28, 1998

Morgan Stanley & Co. Incorporated,
1585 Broadway,
New York, New York 10036.

Ladies and Gentlemen:

     Spieker Properties, L.P., a California limited partnership (the "Operating
Partnership"), proposes, subject to the terms and conditions stated herein and
in the Underwriting Agreement, dated September 24, 1997 (the "Underwriting
Agreement"), between the Operating Partnership and Spieker Properties, Inc., a
Maryland corporation (the "Company"), on the one hand and Goldman, Sachs & Co.,
Merrill Lynch, Pierce, Fenner & Smith Incorporated, J.P. Morgan Securities Inc.
and Morgan Stanley & Co. Incorporated, on the other hand, to issue and sell to
the Underwriter named in Schedule I hereto (the "Underwriter") the Securities
specified in Schedule II hereto (the "Designated Securities"). Each of the
provisions of the Underwriting Agreement is incorporated herein by reference in
its entirety, and shall be deemed to be a part of this Agreement to the same
extent as if such provisions had been set forth in full herein; and each of the
representations and warranties set forth therein shall be deemed to have been
made at and as of the date of this Pricing Agreement, except that each
representation and warranty which refers to the Prospectus in Section 2 of the
Underwriting Agreement shall be deemed to be a representation or warranty as of
the date of the Underwriting Agreement in relation to the Prospectus (as therein
defined), and also a representation and warranty as of the date of this Pricing
Agreement in relation to the Prospectus as amended or supplemented relating to
the Designated Securities which are the subject of this Pricing Agreement. Each
reference to the Representatives herein and in the provisions of the
Underwriting Agreement so incorporated by reference shall be deemed to refer to
you. Unless otherwise defined herein, terms defined in the Underwriting
Agreement are used herein as therein defined.

     An amendment to the Registration Statement, or a supplement to the
Prospectus, as the case may be, relating to the Designated Securities, in the
form heretofore delivered to you is now proposed to be filed with the
Commission.

     Subject to the terms and conditions set forth herein and in the
Underwriting Agreement incorporated herein by reference, the Operating
Partnership agrees to issue and sell to the Underwriter, and the Underwriter
agrees, to purchase from the Operating Partnership, at the time and place and at
the purchase price to the Underwriter set forth in Schedule II hereto, the
principal amount of Designated Securities set forth opposite the name of such
Underwriter in Schedule I hereto.

<PAGE>   2

     If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof, and upon acceptance hereof by you, this
letter and such acceptance hereof, including the provisions of the Underwriting
Agreement incorporated herein by reference, shall constitute a binding agreement
between the Underwriter and the Company and the Operating Partnership.

                           Very truly yours,

                           SPIEKER PROPERTIES, L.P.

                           By:   SPIEKER PROPERTIES, INC.  

                                 By: /s/    Craig G. Vought 
                                     -------------------------------------------
                                     Name:  Craig G. Vought 
                                     Title: Executive Vice President
                                              and Chief Financial Officer

                           SPIEKER PROPERTIES, INC.  

                                 By: /s/    Craig G. Vought 
                                     -------------------------------------------
                                     Name:  Craig G. Vought 
                                     Title: Executive Vice President
                                              and Chief Financial Officer

Accepted as of the date hereof:

Morgan Stanley & Co. Incorporated

By: /s/ Hal Hendershot III
    ---------------------------------


                                        2

<PAGE>   3

                                   SCHEDULE I

<TABLE>
<CAPTION>
                                                                    PRINCIPAL AMOUNT OF
                                                                   DESIGNATED SECURITIES
            UNDERWRITER                                               TO BE PURCHASED
         -----------------                                         ---------------------
<S>                                                                <C>
Morgan Stanley & Co. Incorporated ..............................       $ 1,500,000
                                                                       -----------
Total...........................................................       $ 1,500,000
                                                                       ===========
</TABLE>


                                        3

<PAGE>   4

                                   SCHEDULE II

TITLE OF DESIGNATED SECURITIES:

    7% Notes due February 1, 2007

AGGREGATE PRINCIPAL AMOUNT:

    $1,500,000

INITIAL OFFERING PRICE TO PUBLIC:

    100% plus accrued interest, if any, from February 2, 1998.

PURCHASE PRICE BY UNDERWRITERS:

    99.375% plus accrued interest, if any, from February 2, 1998.

FORM OF DESIGNATED SECURITIES:

    Global Form

SPECIFIED FUNDS FOR PAYMENT OF PURCHASE PRICE:

    Same day funds

TIME OF DELIVERY:

    9:30 a.m. (New York City time), February 2, 1998

INDENTURE:

    Indenture dated December 6, 1995, among the Operating Partnership, the
    Company and State Street Bank and Trust, as Trustee, as supplemented by the
    Thirteenth Supplemental Indenture with First Trust of California, National
    Association as Trustee

MATURITY:

    February 1, 2007

INTEREST RATE:

    7%


                                        4

<PAGE>   5

INTEREST PAYMENT DATES:

    February 1 and August 1, beginning August 1, 1998.

REDEMPTION PROVISION:

    The Notes may be redeemed at any time at the option of the Operating
    Partnership, in whole or from time to time in part, at a redemption price
    equal to the sum of (i) the principal amount of the Notes being redeemed
    plus accrued interest thereon to the redemption date and (ii) the Make-Whole
    Amount, if any, with respect to such Notes.

CLOSING LOCATION:

    Sullivan & Cromwell
    444 South Flower Street
    Los Angeles, California  90071

NAMES AND ADDRESSES OF UNDERWRITER:

        Morgan Stanley & Co. Incorporated
        1585 Broadway -- 2nd Floor
        New York, New York  10036
        Attn:  Medium-Term Note Trading Desk, Carlos Cabrera

CAPTIONS OF PROSPECTUS:

    "Description of Notes"


                                        5

<PAGE>   1
                                                                    EXHIBIT 4.13

                                 TENTH SUPPLEMENTAL INDENTURE


TENTH SUPPLEMENTAL INDENTURE, dated as of December 8, 1997 (this "Tenth
Supplemental Indenture"), among Spieker Properties, Inc., a corporation
organized under the laws of Maryland (the "General Partner"), Spieker
Properties, L.P., a limited partnership organized under the laws of California
(the "Issuer"), and First Trust of California, National Association, as Trustee
(the "Trustee").

                                     W I T N E S S E T H:

        WHEREAS, the Issuer, the General Partner and State Street Bank and Trust
Company ("State Street") executed and delivered an Indenture, dated as of
December 6, 1995 (as supplemented hereby, the "Indenture"), to provide for the
issuance by the Issuer from time to time of debt securities evidencing its
unsecured indebtedness;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, the Issuer and
the General Partner appointed the Trustee as trustee with respect to the series
of securities established by that Supplemental Indenture and future series of
securities under the Indenture, and the Trustee accepted such appointment;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, State Street
remains trustee of all series of securities prior to those established by the
Ninth Supplemental Indenture;

        WHEREAS, pursuant to Board Resolution, the Issuer has authorized the
issuance of $200,000,000 of its 7.35% Debentures Due December 1, 2017 (the
"Debentures");

        WHEREAS, the Issuer desires to establish the terms of the Debentures in
accordance with Section 301 of the Indenture and to establish the form of the
Debentures in accordance with Section 201 of the Indenture.


                                          ARTICLE 1

                                            TERMS

        SECTION 101.  TERMS OF DEBENTURES.  The following terms relating to the
Debentures are hereby established:

               (1) The Debentures shall constitute a series of Securities having
        the title "7.35% Debentures Due December 1, 2017."

               (2) The aggregate principal amount of the Debentures that may be
        authenticated and delivered under the Indenture (except for Debentures
        authenticated and delivered upon registration of transfer of, or in
        exchange for, or

                                            -1-

<PAGE>   2



        in lieu of, other Debentures pursuant to Sections 304, 305, 306, 906,
        1107 or 1305 of the Indenture) shall be up to $200,000,000.

               (3) The entire outstanding principal of the Debentures shall be
        payable on December 1, 2017 (the "Stated Maturity Date").

               (4) The rate at which the Debentures shall bear interest shall be
        7.35%; the date from which interest shall accrue shall be December 8,
        1997; the Interest Payment Dates for the Debentures on which interest
        will be payable shall be June 1 and December 1 in each year, beginning
        June 1, 1998; the Regular Record Dates for the interest payable on the
        Debentures on any Interest Payment Date shall be the 15th calendar day
        preceding the applicable Interest Payment Date; and the basis upon which
        interest shall be calculated shall be that of a 360-day year consisting
        of twelve 30-day months.

               (5) The Place of Payment where the principal of and interest on
        the Debentures shall be payable and Debentures may be surrendered for
        the registration of transfer or exchange shall be the Corporate Trust
        Office of the Trustee in St. Paul, Minnesota. The place where notices or
        demands to or upon the Issuer in respect of the Debentures and the
        Indenture may be served shall be the corporate trust office of the
        Trustee at One California Street, Suite 400, San Francisco, California
        94111.

               (6) (A) The Debentures may be redeemed at any time at the option
        of the Issuer, in whole, or from time to time in part, at a redemption
        price equal to the sum of (i) the principal amount of the Debentures (or
        portion thereof) being redeemed plus accrued interest thereon to the
        redemption date and (ii) the Make-Whole Amount (as defined below), if
        any, with respect to such Debentures (or portion thereof) (the
        "Redemption Price").

               If notice has been given as provided in the Indenture and funds
        for the redemption of any Debentures (or any portion thereof) called for
        redemption shall have been made available on the redemption date
        referred to in such notice, such Debentures (or any portion thereof)
        will cease to bear interest on the date fixed for such redemption
        specified in such notice and the only right of the Holders of the
        Debentures will be to receive payment of the Redemption Price, with
        respect to such Debentures or portion thereof so redeemed.

               Notice of any optional redemption of any Debentures (or any
        portion thereof) will be given to Holders at their addresses, as shown
        in the security register for the Debentures, not more than 60 nor less
        than 30 days prior to the date fixed for redemption. The notice of
        redemption will specify, among other items, the Redemption Price and the
        principal amount of the Debentures held by such Holder to be redeemed.
        On the third Business Day preceding the date notice of redemption is
        given, the Company will notify the Trustee of the Redemption Price and
        the Trustee may rely and shall be

                                            -2-

<PAGE>   3



        fully protected in acting upon the determination of the Company as to
        such Redemption Price.

               The Issuer will notify the Trustee in writing at least 45 days
        prior to giving notice of redemption (or such shorter period as is
        satisfactory to the Trustee in its sole discretion) of the aggregate
        principal amount of Debentures to be redeemed and their redemption date.
        If less than all the Debentures are to be redeemed at the option of the
        Issuer, the Trustee shall select by lot, the Debentures to be redeemed
        in whole or in part.

               In the event of redemption of the Debentures in part only, a new
        Debenture for the amount of the unredeemed portion thereof shall be
        issued in the name of the Holder thereto, upon cancellation thereof.

               (B) As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Debentures, the excess, if any,
        of (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Debentures being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of

                                            -3-

<PAGE>   4



        any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.

               (7) The Debentures shall not be redeemable at the option of any
        Holder thereof, upon the occurrence of any particular circumstances or
        otherwise. The Debentures will not have the benefit of any sinking fund.

               (8) The Debentures shall be issuable in denominations of $1,000
        and any integral multiple thereof.

               (9) The Trustee shall also be the Security Registrar and Paying
        Agent for the Debentures.

               (10) The entire outstanding principal amount plus the Make-Whole
        Amount of the Debentures shall be payable upon declaration of
        acceleration of the maturity thereof pursuant to Section 502 of the
        Indenture.

               (11) Payments of the principal of and interest on the Debentures
        shall be made in U.S. Dollars, and the Debentures shall be denominated
        in U.S. Dollars.

               (12) The Debentures will be payable on the Stated Maturity Date
        in an amount equal to the principal amount thereof plus any unpaid
        interest accrued to the Stated Maturity Date.

               (13) The Holders of the Debentures shall have no special rights
        in addition to those provided in the Indenture upon the occurrence of
        any particular events.

               (14) (A) There shall be no deletions from, modifications of or
        additions to the Events of Default with respect to the Debentures set
        forth in the Indenture.

                    (B) There shall be the following additions to the
        covenants set forth in the Indenture with respect to the Debentures,
        which shall be effective only for so long as any of the Debentures are
        Outstanding:

                    Limitations On Incurrence of Debt. The Issuer will not, and
               will not permit any Subsidiary to, incur any Debt (as defined
               below), other than inter-company debt representing Debt to which
               the only parties are Spieker Properties, Inc., a Maryland
               corporation (the "General Partner"), the Issuer and any of their
               Subsidiaries (but only so long as such Debt is held solely by any
               of the General Partner, the Issuer and any Subsidiary) that is
               subordinate in right of payment to the Debentures if, immediately
               after giving effect to the incurrence of such additional Debt,
               the aggregate principal amount of all outstanding Debt of the
               Issuer and its Subsidiaries on a consolidated basis is greater
               than 60% of the sum of (i) Total Assets (as defined below) as of
               the end of the calendar quarter covered

                                            -4-

<PAGE>   5



               in the Issuer's Annual Report on Form 10-K or Quarterly Report on
               Form 10-Q, as the case may be, most recently filed with the
               Trustee (or such reports of the General Partner if filed by the
               Issuer with the Trustee in lieu of filing its own reports) prior
               to the incurrence of such additional Debt and (ii) the increase
               in Total Assets from the end of such quarter including, without
               limitation, any increase in Total Assets resulting from the
               incurrence of such additional Debt (such increase, together with
               the Total Assets, is referred to as "Adjusted Total Assets").

                    In addition to the foregoing limitation on the incurrence of
               Debt, the Issuer will not, and will not permit any Subsidiary to,
               incur any Debt if the ratio of Consolidated Income Available for
               Debt Service to the Annual Service Charge (in each case as
               defined below) for the four consecutive fiscal quarters most
               recently ended prior to the date on which such additional Debt is
               to be incurred shall have been less than 1.5 to 1, on a pro forma
               basis after giving effect to the incurrence of such Debt and to
               the application of the proceeds therefrom, and calculated on the
               assumption that (i) such Debt and any other Debt incurred by the
               Issuer or its Subsidiaries since the first day of such
               four-quarter period and the application of the proceeds
               therefrom, including to refinance other Debt, had occurred at the
               beginning of such period, (ii) the repayment or retirement of any
               other Debt by the Issuer or its Subsidiaries since the first day
               of such four-quarter period had been incurred, repaid or retired
               at the beginning of such period (except that, in making such
               computation, the amount of Debt under any revolving credit
               facility shall be computed based upon the average daily balance
               of such Debt during such period), (iii) the income earned on any
               increase in Adjusted Total Assets since the end of such
               four-quarter period had been earned, on an annualized basis,
               during such period, and (iv) in the case of any acquisition or
               disposition by the Issuer or any Subsidiary of any asset or group
               of assets since the first day of such four-quarter period,
               including, without limitation, by merger, stock purchase or sale,
               or asset purchase or sale, such acquisition or disposition or any
               related repayment of Debt had occurred as of the first day of
               such period with the appropriate adjustments with respect to such
               acquisition or disposition being included in such pro forma
               calculation.

                    In addition to the foregoing limitations on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt secured by any mortgage, lien, charge, pledge,
               encumbrance or security interest of any kind upon any of the
               property of the Issuer or any Subsidiary ("Secured Debt"),
               whether owned at the date of the Indenture or thereafter
               acquired, if, immediately after giving effect to the incurrence
               of such additional Secured Debt, the aggregate principal amount
               of all outstanding Secured Debt is greater than 40% of Adjusted
               Total Assets.


                                            -5-

<PAGE>   6



                    For purposes of the foregoing provisions regarding the
               limitation on the incurrence of Debt, Debt shall be deemed to be
               "incurred" by the Issuer or a Subsidiary whenever the Issuer and
               its Subsidiary shall create, assume, guarantee or otherwise
               become liable in respect thereof.

                    Maintenance of Total Unencumbered Assets. The Issuer is
               required to maintain Total Unencumbered Assets of not less than
               165% of the aggregate outstanding principal amount of all
               outstanding Unsecured Debt.

                    As used herein:

                    "Annual Service Charge" as of any date means the amount
               which is expensed in any 12-month period for interest on Debt of
               the Issuer and its Subsidiaries.

                    "Consolidated Income Available For Debt Service" for any
               period means Consolidated Net Income plus amounts which have been
               deducted for (a) interest on Debt of the Issuer and its
               Subsidiaries, (b) provision for taxes of the Issuer and its
               Subsidiaries based on income, (c) amortization of Debt discount,
               (d) provisions for gains and losses on properties, (e)
               depreciation and amortization, (f) the effect of any noncash
               charge resulting from a change in accounting principles in
               determining Consolidated Net Income for such period and (g)
               amortization of deferred charges.

                    "Consolidated Net Income" for any period means the amount of
               consolidated net income (or loss) of the Issuer and its
               Subsidiaries for such period determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                    "Debt" of the Issuer or any Subsidiary means any
               indebtedness of the Issuer or such Subsidiary, as applicable,
               whether or not contingent, in respect of (i) borrowed money
               evidenced by bonds, notes, debentures or similar instruments,
               (ii) indebtedness secured by any mortgage, pledge, lien, charge,
               encumbrance or any security interest existing on property owned
               by the Issuer or such Subsidiary, (iii) the reimbursement
               obligations, contingent or otherwise, in connection with any
               letters of credit actually issued or amounts representing the
               balance that constitutes an accrued expense or trade payable or
               (iv) any lease of property by the Issuer or such Subsidiary as
               lessee which is reflected in the Issuer's consolidated balance
               sheet as a capitalized lease in accordance with generally
               accepted accounting principles, in the case of items of
               indebtedness under (i) through (iii) above to the extent that any
               such items (other than letters of credit) would appear as a
               liability on the Issuer's consolidated balance sheet in
               accordance with generally accepted accounting principles, and
               also includes, to the extent not otherwise included, any
               obligation by the Issuer or such Subsidiary to be liable

                                            -6-

<PAGE>   7



               for, or to pay, as obligor, guarantor or otherwise (other than
               for purposes of collection in the ordinary course of business),
               indebtedness of another person (other than the Issuer or any
               Subsidiary).

                    "Subsidiary" means a corporation, partnership or limited
               liability company, a majority of the outstanding voting stock,
               partnership interests or membership interests, as the case may
               be, of which is owned or controlled, directly or indirectly, by
               the Issuer or by one or more other Subsidiaries of the Issuer.
               For the purposes of this definition, "voting stock" means stock
               having the voting power for the election of directors, general
               partners, managers or trustees, as the case may be, whether at
               all times or only so long as no senior class of stock has such
               voting power by reason of any contingency.

                    "Total Assets" as of any date means the sum of (i)
               Undepreciated Real Estate Assets and (ii) all other assets of the
               Issuer and its Subsidiaries on a consolidated basis determined in
               accordance with generally accepted accounting principles (but
               excluding intangibles and accounts receivable).

                    "Total Unencumbered Assets" as of any date means the sum of
               (i) those Undepreciated Real Estate Assets which have not been
               pledged, mortgaged or otherwise encumbered by the owner thereof
               to secure Debt, excluding infrastructure assessment bonds, and
               (ii) all other assets of the Issuer and its Subsidiaries
               determined in accordance with generally accepted accounting
               principles (but excluding intangibles and accounts receivable)
               which have not been pledged, mortgaged or otherwise encumbered by
               the owner thereof to secure Debt.

                    "Undepreciated Real Estate Assets" as of any date means the
               cost (original cost plus capital improvements) of real estate
               assets of the Issuer and its Subsidiaries on such date, before
               depreciation and amortization, determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                    "Unsecured Debt" as of any date means Debt which is not
               secured by any mortgage, lien, charge, pledge, encumbrance or
               security interest of any kind upon any of the properties of the
               Issuer or any Subsidiary.

               (C) The Trustee shall not be obligated to monitor or confirm, on
        a continuing basis or otherwise, the Issuer's compliance with the
        covenants contained in this subsection or with respect to reports or
        other documents filed under the Indenture; provided, however, that
        nothing herein shall relieve the Trustee of any obligations to monitor
        the Issuer's timely delivery of all reports and certificates required
        under Sections 703 and 1005 of the Indenture and to fulfill its
        obligations under Article Six of the Indenture.


                                            -7-

<PAGE>   8



               (15) The Debentures shall be issuable only as Registered
        Securities in permanent global form (without coupons). Beneficial owners
        of interests in the permanent global Debentures may exchange such
        interests for Debentures of like tenor or any authorized form and
        denomination only in the manner provided in Section 305 of the
        Indenture. DTC shall be the depository with respect to the permanent
        global Debenture.

               (16) The Debentures shall not be issuable as Bearer Securities.

               (17) Interest on any Debenture shall be payable only to the
        Person in whose name that Debenture (or one or more predecessor
        Debentures thereof) is registered at the close of business on the
        Regular Record Date for such interest.

               (18) Sections 1402 and 1403 of the Indenture shall be applicable
        to the Debentures.

               (19) The Debentures shall not be issuable in definitive form
        except under the circumstances described in Section 305 of the
        Indenture.

               (20) Articles Sixteen and Seventeen of the Indenture shall not be
        applicable to the Debentures.

               (21) The Issuer shall not pay Additional Amounts with respect to
        the Debentures as contemplated by Section 1009 of the Indenture.

               (22) The Debentures shall not be subordinated to any other debt
        of the Issuer, and shall constitute senior unsecured obligations of the
        Issuer.

        SECTION 102. FORM OF DEBENTURE. The form of the Debenture is attached
hereto as Exhibit A.

                                   ARTICLE II

                                  MISCELLANEOUS

        SECTION 201. DEFINITIONS. Capitalized terms used but not defined in this
Tenth Supplemental Indenture shall have the meanings ascribed thereto in the
Indenture.

        SECTION 202. CONFIRMATION OF INDENTURE. The Indenture, as heretofore
supplemented and amended by this Tenth Supplemental Indenture, is in all
respects ratified and confirmed, and the Indenture, this Tenth Supplemental
Indenture and all indentures supplemental thereto shall be read, taken and
construed as one and the same instrument.

        SECTION 203. CONCERNING THE TRUSTEE. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Tenth Supplemental Indenture
other than as set

                                            -8-

<PAGE>   9


forth in the Indenture and, in carrying out its responsibilities hereunder,
shall have all of the rights, protections and immunities which it possesses
under the Indenture.

        SECTION 204. GOVERNING LAW. This Tenth Supplemental Indenture, the
Indenture and the Securities shall be governed by and construed in accordance
with the law of the State of New York.

        SECTION 205. SEPARABILITY. In case any provision in this Tenth
Supplemental Indenture shall for any reason be held to be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

        SECTION 206. COUNTERPARTS. This Tenth Supplemental Indenture may be
executed in any number of counterparts each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

                                            -9-

<PAGE>   10



        IN WITNESS WHEREOF, the parties hereto have caused this Tenth
Supplemental Indenture to be duly executed, and the corporate seal of the
General Partner to be hereunto affixed and attested, as of the day and year
first above written.


                               SPIEKER PROPERTIES, L.P.

                               By: Spieker Properties, Inc., as General Partner


                               By: /s/ Craig G. Vought
                                   ---------------------------------------------
                                   Name:  Craig G. Vought
                                   Title: Executive Vice President
                                          and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein
    --------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary


                              SPIEKER PROPERTIES, INC.


                              By:  /s/ Craig G. Vought
                                   ---------------------------------------------
                                   Name: Craig G. Vought
                                   Title: Executive Vice President
                                          and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein
    --------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary



                                            -10-

<PAGE>   11




                              FIRST TRUST OF CALIFORNIA,
                              NATIONAL ASSOCIATION, as Trustee



                              By:   /s/ Jennifer Holder
                                   ---------------------------------------------
                                    Name:  Jennifer Holder
                                    Title: Vice President
Attest:

By: /s/ Josephine Libunao
    --------------------------
    Name:  Josephine Libunao
    Title: Assistant Vice President





                                            -11-

<PAGE>   12




STATE OF  California           )
COUNTY OF San Mateo            ) ss.:

        On the 8th day of December, 1997, before me personally came Craig G.
Vought to me known, who, being by me duly sworn, did depose and say that he is
the EVP and CFO of Spieker Properties, Inc., one of the entities described in
and which executed the above instrument; that he knows the corporate seal of
said corporation; that the seal affixed to the said instrument is such corporate
seal; that it was so affixed by authority of the corporation, and that he signed
his name thereto by like authority.

                              /s/ Julie L. Bartlow
                                   ---------------------------------------------


        [Seal]


                                            -12-

<PAGE>   13



                                                                       EXHIBIT A


UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR DEBENTURES IN
DEFINITIVE FORM, THIS DEBENTURE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE
DEPOSITORY TO A NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO
THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY
SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR
DEPOSITORY. UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER
OR ITS AGENT FOR REGISTRATION OR TRANSFER, EXCHANGE OR PAYMENT, AND ANY
CERTIFICATE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS
REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO
CEDE & CO. OR SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE
OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR
TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO.,
HAS AN INTEREST HEREIN.


REGISTERED                                                     PRINCIPAL AMOUNT
NO.: R-1                                                              $

CUSIP NO.:  848503 AG 3

                            SPIEKER PROPERTIES, L.P.
                      7.35% DEBENTURE DUE DECEMBER 1, 2017

        SPIEKER PROPERTIES, L.P., a California limited partnership (the
"Issuer"), for value received, hereby promises to pay to Cede & Co., or
registered assignee (the "Holder"), upon presentation, the principal sum of 
$            on December 1, 2017, and to pay interest on the outstanding
principal amount thereon from December 8, 1997, or from the most recent Interest
Payment Date to which interest has been paid or duly provided for, semi-annually
in arrears on June 1 and December 1 in each year (each an "Interest Payment
Date"), commencing June 1, 1998, and at the Stated Maturity, at the rate of
7.35% per annum, computed on the basis of a 360-day year comprised of twelve
30-day months, until the entire principal amount hereof is paid or duly provided
for. The interest so payable, and punctually paid or duly provided for on any
Interest Payment Date will, as provided in the Indenture (hereinafter defined),
be paid to the person in whose name this debenture (the "Debenture") (or one or
more predecessor Debentures) is registered at the close of business on the
Regular Record Date for such Interest Payment Date which shall be the 15th
calendar day preceding the applicable Interest Payment Date. Any such interest
not so punctually paid or duly provided for shall forthwith cease to be payable
to the Holder on such Regular Record Date, and may either be paid to the Person
in whose name this Debenture (or one or more predecessor Debentures) is
registered at the close of business on a Special Record Date for the payment of
such Defaulted Interest to be fixed by the Trustee, notice whereof shall be
given to Holders of Debentures not more than 15 days and not less than 10 days

                                            -1-

<PAGE>   14


prior to such Special Record Date, or may be paid at any time in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which the Debentures may be listed, and upon such notice as may be required
by such exchange, all as more fully provided in the Indenture. Payments of the
principal of, and interest on, this Debenture will be made at the office or
agency of the Trustee (hereinafter defined) maintained for that purpose at 180
E. Fifth Street, St. Paul, Minnesota 55101, or elsewhere as provided in the
Indenture, in United States Dollars; provided, however, that at the option of
the Holder hereof, and upon written notice to the Trustee of not less than five
Business Days prior to the applicable Interest Payment Date, payment of interest
may be made by (i) check mailed to the address of the Person entitled thereto as
such address shall appear in the Security Register kept for the Debentures
pursuant to Section 305 of the Indenture (the "Debenture Register") or (ii)
transfer to an account of the Person entitled thereto located inside the United
States.

        This Debenture is one of a fully authorized issue of securities of the
Issuer issued as a series of securities issued and to be issued under an
Indenture, dated as of December 6, 1995 as supplemented by the Tenth
Supplemental Indenture dated December 8, 1997 (collectively, the "Indenture"),
among the Issuer and First Trust of California, National Association (the
"Trustee," which term includes any successor trustee under the Indenture with
respect to the Debentures), to which Indenture and all indentures supplemental
thereto reference is hereby made for a statement of the respective rights,
limitations of rights, duties and immunities thereunder of the Issuer, the
Trustee and the Holders of the Debentures, and of the terms upon which the
Debentures are, and are to be, authenticated and delivered. This Debenture is
one of the series designated as the "7.35% Debentures due December 1, 2017,"
limited in the aggregate principal amount to $200,000,000.

        The Debentures may be redeemed at any time at the option of the Issuer,
in whole or from time to time in part, at a redemption price (the "Redemption
Price") equal to the sum of (i) the principal amount of the Debentures (or
portion thereof) being redeemed plus accrued interest thereon to the redemption
date and (ii) the Make-Whole Amount (as defined below), if any, with respect to
such Debentures (or portion thereof).

        If notice has been given as provided in the Indenture and funds for the
redemption of any Debentures (or any portion thereof) called for redemption
shall have been made available on the redemption date referred to in such
notice, such Debentures (or any portion thereof) will cease to bear interest on
the date fixed for such redemption specified in such notice and the only right
of the Holders of the Debentures will be to receive payment of the Redemption
Price, with respect to such Debentures or portion thereof so redeemed.

        Notice of any optional redemption of any Debentures (or any portion
thereof) will be given to Holders at their addresses, as shown in the Debenture
Register, not more than 60 nor less than 30 days prior to the date fixed for
redemption. The notice of redemption will specify, among other items, the
Redemption Price and the principal amount of the Debentures held by such Holder
to be redeemed.

                                       -2-

<PAGE>   15


        The Issuer will notify the Trustee at least 45 days prior to giving
notice of redemption (or such shorter period as is satisfactory to the Trustee)
of the aggregate principal amount of Debentures to be redeemed and their
redemption date. If less than all the Debentures are to be redeemed at the
option of the Issuer, the Trustee shall select, in such manner as it shall deem
fair and appropriate, the Debentures to be redeemed in whole or in part.

        In the event of redemption of the Debentures in part only, a new
Debenture for the amount of the unredeemed portion hereof shall be issued in the
name of the Holder hereto, upon cancellation hereof.

        As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Debentures, the excess, if any,
        of (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Debentures being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.

                                       -3-

<PAGE>   16

        The Indenture contains provisions for defeasance at any time of (a) the
entire indebtedness of the Issuer on this Debenture and (b) certain restrictive
covenants and the related defaults and Events of Default applicable to the
Issuer, in each case, upon compliance by the Issuer with certain conditions set
forth in the Indenture, which provisions apply to this Debenture.

        The Issuer is subject to certain covenants contained in the Indenture
with respect to, and for the benefit of the Holders of, the Debentures. The
Trustee shall not be obligated to monitor or confirm, on a continuing basis or
otherwise, the Issuer's compliance with the covenants contained in the Indenture
or with respect to reports or other certificates filed under the Indenture;
provided, however, that nothing herein shall relieve the Trustee of any
obligations to monitor the Issuer's timely delivery of all reports and
certificates required under Sections 703 and 1005 of the Indenture and to
fulfill its obligations under Article Six of the Indenture. If an Event of
Default as defined in the Indenture with respect to the Debentures shall occur
and be continuing, the principal of the Debentures may be declared due and
payable in the manner and with the effect provided in the Indenture.

        As provided in and subject to the provisions of the Indenture, the
Holder of this Debenture shall not have the right to institute any proceeding
with respect to the Indenture or for the appointment of a receiver or trustee or
for any other remedy thereunder, unless such Holder shall have previously given
the Trustee written notice of a continuing Event of Default with respect to the
Debentures, the Holders of not less than a majority in principal amount of the
Debentures at the time Outstanding shall have made written request to the
Trustee to institute proceedings in respect of such Event of Default as Trustee
and offered the Trustee reasonable indemnity and shall have failed to institute
any such proceeding, for 60 days after receipt of such notice, request and offer
of indemnity and the Trustee shall not have received from the Holders of a
majority in principal amount of the Debentures at the time Outstanding a
direction inconsistent with such request. The foregoing shall not apply to any
suit instituted by the Holder of this Debenture for the enforcement of any
payment of principal hereof or any interest on or after the respective due dates
expressed herein.

        The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Debentures under the Indenture at
any time by the Issuer and the Trustee with the consent of the Holders of not
less than a majority in principal amount of the Outstanding Debentures. The
Indenture also contains provisions permitting the Holders of not less than a
majority in principal amount of the Debentures at the time Outstanding, on
behalf of the Holders of all Debentures, to waive compliance by the Issuer with
certain provisions of the Indenture and certain past defaults under the
Indenture and their consequences. Any such consent or waiver by the Holder of
this Debenture shall be conclusive and binding upon such Holder and upon all
future Holders of this Debenture and of any Debenture issued upon the
registration of transfer hereof or in exchange herefor or in lieu hereof,
whether or not notation of such consent or waiver is made upon this Debenture.


                                            -4-

<PAGE>   17

        No reference herein to the Indenture and no provision of this Debenture
or of the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of, and interest on, this
Debenture at the times, place and rate, and in the coin or currency, herein
prescribed.

        As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Debenture is registrable in the Debenture
Register, upon surrender of this Debenture for registration of transfer at the
office or agency of the Issuer in any Place of Payment where the principal of,
and interest on, this Debenture are payable, duly endorsed by, or accompanied by
a written instrument of transfer in form satisfactory to the Issuer and the
Security Registrar for the Debentures duly executed by, the Holder hereof or his
attorney duly authorized denominations and for the same aggregate principal
amount, will be issued to the designated transferee or transferees.

        The Debentures of this series are issuable only in registered form
without coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
the Debentures are exchangeable for a like aggregate principal amount of
Debentures of this series of a different authorized denomination, as requested
by the Holder surrendering the same.

        No service charge shall be made for any such registration of transfer or
exchange, but the Issuer may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

        Prior to due presentment of this Debenture for registration of transfer,
the Issuer, the Trustee and any agent of the Issuer or the Trustee may treat the
Person in whose name this Debenture is registered as the owner hereof for all
purposes, whether or not this Debenture be overdue, and neither the Issuer, the
Trustee nor any such agent shall be affected by notice to the contrary.

        All terms used in this Debenture which are defined in the Indenture
shall have the meanings assigned to them in the Indenture.

        THE INDENTURE AND THE DEBENTURES INCLUDING THIS DEBENTURE SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE OF NEW YORK.

        Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Issuer has caused "CUSIP" numbers to be
printed on the Debentures as a convenience to the Holders of the Debentures. No
representation is made as to the correctness or accuracy of such CUSIP numbers
as printed on the Debentures, and reliance may be placed only on the other
identification numbers printed hereon.


                                       -5-

<PAGE>   18

        Unless the certificate of authentication hereon has been executed by or
on behalf of the Trustee by manual signature, this Debenture shall not be
entitled to any benefit under the Indenture or be valid or obligatory for any
purposes.

        IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed under its corporate seal this ___ day of ____________.

                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as
                                    General Partner



                              By:
                                   ---------------------------------------------
                                   Name:  Craig G. Vought
                                   Title: Executive Vice President
                                            and Chief Financial Officer



[SEAL]

Attest:


By: --------------------------
    Name:  Stuart A. Rothstein
    Title: Vice President - Finance
             and Assistant Secretary



                                       -6-

<PAGE>   19

                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION:

        This is one of the Debentures of the series designated "7.35% Debentures
due December 1, 2017" referred to in the within-mentioned Indenture.

FIRST TRUST OF CALIFORNIA, NATIONAL ASSOCIATION,
as Trustee


By: ____________________________
      Name:
      Title:


                                            -7-

<PAGE>   20

                                 ASSIGNMENT FORM

                   FOR VALUE RECEIVED, the undersigned hereby
                         sells, assigns and transfers to




- -----------------------------------------------------------------
(Insert Social Security number or other identifying number of assignee)

- -----------------------------------------------------------------
(Please print or typewrite name and address, including zip, code of assignee)

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


the within Debenture of Spieker Properties, L.P. and hereby does irrevocably
constitute and appoint

- -----------------------------------------------------------------
Attorney to transfer said Debenture on the books of the within-named Issuer with
full power of substitution in the premises.

Dated:____________                  ___________________________________

                                    ___________________________________


Signature(s) must be guaranteed by an eligible Guarantor Institution (banks,
stock brokers, savings and loan associations and credit unions) with membership
in an approved signature guarantee medallion program pursuant to Securities and
Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it
appears on the first page of the within Debenture in every particular, without
alteration or enlargement or any change whatever.





                                       -8-


<PAGE>   1
                                                                    EXHIBIT 4.14


                         ELEVENTH SUPPLEMENTAL INDENTURE


        ELEVENTH SUPPLEMENTAL INDENTURE, dated as of January 27, 1998 (this
"Eleventh Supplemental Indenture"), among Spieker Properties, Inc., a
corporation organized under the laws of Maryland (the "General Partner"),
Spieker Properties, L.P., a limited partnership organized under the laws of
California (the "Issuer"), and First Trust of California, National Association,
as Trustee (the "Trustee").

                              W I T N E S S E T H:

        WHEREAS, the Issuer, the General Partner and State Street Bank and Trust
Company ("State Street") executed and delivered an Indenture, dated as of
December 6, 1995 (as supplemented hereby, the "Indenture"), to provide for the
issuance by the Issuer from time to time of debt securities evidencing its
unsecured indebtedness;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, the Issuer and
the General Partner appointed the Trustee as trustee with respect to the series
of securities established by that Supplemental Indenture and future series of
securities under the Indenture, and the Trustee accepted such appointment;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, State Street
remains trustee of all series of securities prior to those established by the
Ninth Supplemental Indenture;

        WHEREAS, pursuant to Board Resolution, the Issuer has authorized the
issuance of $150,000,000 of its 6.75% Notes Due January 15, 2008 (the "Notes");

        WHEREAS, the Issuer desires to establish the terms of the Notes in
accordance with Section 301 of the Indenture and to establish the form of the
Notes in accordance with Section 201 of the Indenture.


                                    ARTICLE 1

                                      TERMS

        SECTION 101. TERMS OF NOTES. The following terms relating to the Notes
are hereby established:

               (1) The Notes shall constitute a series of Securities having the
        title "6.75% Notes Due January 15, 2008."

               (2) The aggregate principal amount of the Notes that may be
        authenticated and delivered under the Indenture (except for Notes
        authenticated and delivered upon registration of transfer of, or in
        exchange for, or in lieu of,

                                       -1-

<PAGE>   2


        other Notes pursuant to Sections 304, 305, 306, 906, 1107 or 1305 of the
        Indenture) shall be up to $150,000,000.

               (3) The entire outstanding principal of the Notes shall be
        payable on January 15, 2008 (the "Stated Maturity Date").

               (4) The rate at which the Notes shall bear interest shall be
        6.75%; the date from which interest shall accrue shall be January 27,
        1998; the Interest Payment Dates for the Notes on which interest will be
        payable shall be January 15 and July 15 in each year, beginning July 15,
        1998; the Regular Record Dates for the interest payable on the Notes on
        any Interest Payment Date shall be the 15th calendar day preceding the
        applicable Interest Payment Date; and the basis upon which interest
        shall be calculated shall be that of a 360-day year consisting of twelve
        30-day months.

               (5) The Place of Payment where the principal of and interest on
        the Notes shall be payable and Notes may be surrendered for the
        registration of transfer or exchange shall be the Corporate Trust Office
        of the Trustee in St. Paul, Minnesota. The place where notices or
        demands to or upon the Issuer in respect of the Notes and the Indenture
        may be served shall be the corporate trust office of the Trustee at One
        California Street, Suite 400, San Francisco, California 94111.

               (6) (A) The Notes may be redeemed at any time at the option of
        the Issuer, in whole, or from time to time in part, at a redemption
        price equal to the sum of (i) the principal amount of the Notes (or
        portion thereof) being redeemed plus accrued interest thereon to the
        redemption date and (ii) the Make-Whole Amount (as defined below), if
        any, with respect to such Notes (or portion thereof) (the "Redemption
        Price").

               If notice has been given as provided in the Indenture and funds
        for the redemption of any Notes (or any portion thereof) called for
        redemption shall have been made available on the redemption date
        referred to in such notice, such Notes (or any portion thereof) will
        cease to bear interest on the date fixed for such redemption specified
        in such notice and the only right of the Holders of the Notes will be to
        receive payment of the Redemption Price, with respect to such Notes or
        portion thereof so redeemed.

                Notice of any optional redemption of any Notes (or any portion
        thereof) will be given to Holders at their addresses, as shown in the
        security register for the Notes, not more than 60 nor less than 30 days
        prior to the date fixed for redemption. The notice of redemption will
        specify, among other items, the Redemption Price and the principal
        amount of the Notes held by such Holder to be redeemed. On the third
        Business Day preceding the date notice of redemption is given, the
        Company will notify the Trustee of the Redemption Price and the Trustee
        may rely and shall be fully protected in acting upon the determination
        of the Company as to such Redemption Price.


                                       -2-

<PAGE>   3

               The Issuer will notify the Trustee in writing at least 45 days
        prior to giving notice of redemption (or such shorter period as is
        satisfactory to the Trustee in its sole discretion) of the aggregate
        principal amount of Notes to be redeemed and their redemption date. If
        less than all the Notes are to be redeemed at the option of the Issuer,
        the Trustee shall select by lot, the Notes to be redeemed in whole or in
        part.

               In the event of redemption of the Notes in part only, a new Note
        for the amount of the unredeemed portion thereof shall be issued in the
        name of the Holder thereto, upon cancellation thereof.

               (B) As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Notes, the excess, if any, of
        (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Notes being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.


                                       -3-

<PAGE>   4

               (7) The Notes shall not be redeemable at the option of any Holder
        thereof, upon the occurrence of any particular circumstances or
        otherwise. The Notes will not have the benefit of any sinking fund.

               (8) The Notes shall be issuable in denominations of $1,000 and
        any integral multiple thereof.

               (9) The Trustee shall also be the Security Registrar and Paying
        Agent for the Notes.

               (10) The entire outstanding principal amount plus the Make-Whole
        Amount of the Notes shall be payable upon declaration of acceleration of
        the maturity thereof pursuant to Section 502 of the Indenture.

               (11) Payments of the principal of and interest on the Notes shall
        be made in U.S. Dollars, and the Notes shall be denominated in U.S.
        Dollars.

               (12) The Notes will be payable on the Stated Maturity Date in an
        amount equal to the principal amount thereof plus any unpaid interest
        accrued to the Stated Maturity Date.

               (13) The Holders of the Notes shall have no special rights in
        addition to those provided in the Indenture upon the occurrence of any
        particular events.

               (14) (A) There shall be no deletions from, modifications of or
        additions to the Events of Default with respect to the Notes set forth
        in the Indenture.

               (B) There shall be the following additions to the covenants set
        forth in the Indenture with respect to the Notes, which shall be
        effective only for so long as any of the Notes are Outstanding:

                      Limitations On Incurrence of Debt. The Issuer will not,
               and will not permit any Subsidiary to, incur any Debt (as defined
               below), other than inter-company debt representing Debt to which
               the only parties are Spieker Properties, Inc., a Maryland
               corporation (the "General Partner"), the Issuer and any of their
               Subsidiaries (but only so long as such Debt is held solely by any
               of the General Partner, the Issuer and any Subsidiary) that is
               subordinate in right of payment to the Notes if, immediately
               after giving effect to the incurrence of such additional Debt,
               the aggregate principal amount of all outstanding Debt of the
               Issuer and its Subsidiaries on a consolidated basis is greater
               than 60% of the sum of (i) Total Assets (as defined below) as of
               the end of the calendar quarter covered in the Issuer's Annual
               Report on Form 10-K or Quarterly Report on Form 10-Q, as the case
               may be, most recently filed with the Trustee (or such reports of
               the General Partner if filed by the Issuer with the Trustee in
               lieu of filing its own reports) prior

                                       -4-

<PAGE>   5

               to the incurrence of such additional Debt and (ii) the increase
               in Total Assets from the end of such quarter including, without
               limitation, any increase in Total Assets resulting from the
               incurrence of such additional Debt (such increase, together with
               the Total Assets, is referred to as "Adjusted Total Assets").

                      In addition to the foregoing limitation on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt if the ratio of Consolidated Income Available
               for Debt Service to the Annual Service Charge (in each case as
               defined below) for the four consecutive fiscal quarters most
               recently ended prior to the date on which such additional Debt is
               to be incurred shall have been less than 1.5 to 1, on a pro forma
               basis after giving effect to the incurrence of such Debt and to
               the application of the proceeds therefrom, and calculated on the
               assumption that (i) such Debt and any other Debt incurred by the
               Issuer or its Subsidiaries since the first day of such
               four-quarter period and the application of the proceeds
               therefrom, including to refinance other Debt, had occurred at the
               beginning of such period, (ii) the repayment or retirement of any
               other Debt by the Issuer or its Subsidiaries since the first day
               of such four-quarter period had been incurred, repaid or retired
               at the beginning of such period (except that, in making such
               computation, the amount of Debt under any revolving credit
               facility shall be computed based upon the average daily balance
               of such Debt during such period), (iii) the income earned on any
               increase in Adjusted Total Assets since the end of such
               four-quarter period had been earned, on an annualized basis,
               during such period, and (iv) in the case of any acquisition or
               disposition by the Issuer or any Subsidiary of any asset or group
               of assets since the first day of such four-quarter period,
               including, without limitation, by merger, stock purchase or sale,
               or asset purchase or sale, such acquisition or disposition or any
               related repayment of Debt had occurred as of the first day of
               such period with the appropriate adjustments with respect to such
               acquisition or disposition being included in such pro forma
               calculation.

                      In addition to the foregoing limitations on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt secured by any mortgage, lien, charge, pledge,
               encumbrance or security interest of any kind upon any of the
               property of the Issuer or any Subsidiary ("Secured Debt"),
               whether owned at the date of the Indenture or thereafter
               acquired, if, immediately after giving effect to the incurrence
               of such additional Secured Debt, the aggregate principal amount
               of all outstanding Secured Debt is greater than 40% of Adjusted
               Total Assets.

                      For purposes of the foregoing provisions regarding the
               limitation on the incurrence of Debt, Debt shall be deemed to be
               "incurred" by the Issuer or a Subsidiary whenever the Issuer and
               its Subsidiary shall create, assume, guarantee or otherwise
               become liable in respect thereof.


                                       -5-

<PAGE>   6



                      Maintenance of Total Unencumbered Assets. The Issuer is
               required to maintain Total Unencumbered Assets of not less than
               165% of the aggregate outstanding principal amount of all
               outstanding Unsecured Debt.

                      As used herein:

                      "Annual Service Charge" as of any date means the amount
               which is expensed in any 12-month period for interest on Debt of
               the Issuer and its Subsidiaries.

                      "Consolidated Income Available For Debt Service" for any
               period means Consolidated Net Income plus amounts which have been
               deducted for (a) interest on Debt of the Issuer and its
               Subsidiaries, (b) provision for taxes of the Issuer and its
               Subsidiaries based on income, (c) amortization of Debt discount,
               (d) provisions for gains and losses on properties, (e)
               depreciation and amortization, (f) the effect of any noncash
               charge resulting from a change in accounting principles in
               determining Consolidated Net Income for such period and (g)
               amortization of deferred charges.

                      "Consolidated Net Income" for any period means the amount
               of consolidated net income (or loss) of the Issuer and its
               Subsidiaries for such period determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                      "Debt" of the Issuer or any Subsidiary means any
               indebtedness of the Issuer or such Subsidiary, as applicable,
               whether or not contingent, in respect of (i) borrowed money
               evidenced by bonds, notes, Notes or similar instruments, (ii)
               indebtedness secured by any mortgage, pledge, lien, charge,
               encumbrance or any security interest existing on property owned
               by the Issuer or such Subsidiary, (iii) the reimbursement
               obligations, contingent or otherwise, in connection with any
               letters of credit actually issued or amounts representing the
               balance that constitutes an accrued expense or trade payable or
               (iv) any lease of property by the Issuer or such Subsidiary as
               lessee which is reflected in the Issuer's consolidated balance
               sheet as a capitalized lease in accordance with generally
               accepted accounting principles, in the case of items of
               indebtedness under (i) through (iii) above to the extent that any
               such items (other than letters of credit) would appear as a
               liability on the Issuer's consolidated balance sheet in
               accordance with generally accepted accounting principles, and
               also includes, to the extent not otherwise included, any
               obligation by the Issuer or such Subsidiary to be liable for, or
               to pay, as obligor, guarantor or otherwise (other than for
               purposes of collection in the ordinary course of business),
               indebtedness of another person (other than the Issuer or any
               Subsidiary).


                                       -6-

<PAGE>   7

                      "Subsidiary" means a corporation, partnership or limited
               liability company, a majority of the outstanding voting stock,
               partnership interests or membership interests, as the case may
               be, of which is owned or controlled, directly or indirectly, by
               the Issuer or by one or more other Subsidiaries of the Issuer.
               For the purposes of this definition, "voting stock" means stock
               having the voting power for the election of directors, general
               partners, managers or trustees, as the case may be, whether at
               all times or only so long as no senior class of stock has such
               voting power by reason of any contingency.

                      "Total Assets" as of any date means the sum of (i)
               Undepreciated Real Estate Assets and (ii) all other assets of the
               Issuer and its Subsidiaries on a consolidated basis determined in
               accordance with generally accepted accounting principles (but
               excluding intangibles and accounts receivable).

                      "Total Unencumbered Assets" as of any date means the sum
               of (i) those Undepreciated Real Estate Assets which have not been
               pledged, mortgaged or otherwise encumbered by the owner thereof
               to secure Debt, excluding infrastructure assessment bonds, and
               (ii) all other assets of the Issuer and its Subsidiaries
               determined in accordance with generally accepted accounting
               principles (but excluding intangibles and accounts receivable)
               which have not been pledged, mortgaged or otherwise encumbered by
               the owner thereof to secure Debt.

                      "Undepreciated Real Estate Assets" as of any date means
               the cost (original cost plus capital improvements) of real estate
               assets of the Issuer and its Subsidiaries on such date, before
               depreciation and amortization, determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                      "Unsecured Debt" as of any date means Debt which is not
               secured by any mortgage, lien, charge, pledge, encumbrance or
               security interest of any kind upon any of the properties of the
               Issuer or any Subsidiary.

                      (C) The Trustee shall not be obligated to monitor or 
        confirm, on a continuing basis or otherwise, the Issuer's compliance
        with the covenants contained in this subsection or with respect to
        reports or other documents filed under the Indenture; provided, however,
        that nothing herein shall relieve the Trustee of any obligations to
        monitor the Issuer's timely delivery of all reports and certificates
        required under Sections 703 and 1005 of the Indenture and to fulfill its
        obligations under Article Six of the Indenture.

               (15) The Notes shall be issuable only as Registered Securities in
        permanent global form (without coupons). Beneficial owners of interests
        in the permanent global Notes may exchange such interests for Notes of
        like tenor or any authorized form and

                                       -7-

<PAGE>   8

        denomination only in the manner provided in Section 305 of the
        Indenture. DTC shall be the depository with respect to the permanent
        global Note.

               (16) The Notes shall not be issuable as Bearer Securities.

               (17) Interest on any Note shall be payable only to the Person in
        whose name that Note (or one or more predecessor Notes thereof) is
        registered at the close of business on the Regular Record Date for such
        interest.

               (18) Sections 1402 and 1403 of the Indenture shall be applicable
        to the Notes.

               (19) The Notes shall not be issuable in definitive form except
        under the circumstances described in Section 305 of the Indenture.

               (20) Articles Sixteen and Seventeen of the Indenture shall not be
        applicable to the Notes.

               (21) The Issuer shall not pay Additional Amounts with respect to
        the Notes as contemplated by Section 1009 of the Indenture.

               (22) The Notes shall not be subordinated to any other debt of the
        Issuer, and shall constitute senior unsecured obligations of the Issuer.

        SECTION 102. FORM OF NOTE. The form of the Note is attached hereto as
Exhibit A.

                                   ARTICLE II

                                  MISCELLANEOUS

        SECTION 201. DEFINITIONS. Capitalized terms used but not defined in this
Eleventh Supplemental Indenture shall have the meanings ascribed thereto in the
Indenture.

        SECTION 202. CONFIRMATION OF INDENTURE. The Indenture, as heretofore
supplemented and amended by this Eleventh Supplemental Indenture, is in all
respects ratified and confirmed, and the Indenture, this Eleventh Supplemental
Indenture and all indentures supplemental thereto shall be read, taken and
construed as one and the same instrument.

        SECTION 203. CONCERNING THE TRUSTEE. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Eleventh Supplemental
Indenture other than as set forth in the Indenture and, in carrying out its
responsibilities hereunder, shall have all of the rights, protections and
immunities which it possesses under the Indenture.


                                       -8-

<PAGE>   9

        SECTION 204. GOVERNING LAW. This Eleventh Supplemental Indenture, the
Indenture and the Securities shall be governed by and construed in accordance
with the law of the State of New York.

        SECTION 205. SEPARABILITY. In case any provision in this Eleventh
Supplemental Indenture shall for any reason be held to be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

        SECTION 206. COUNTERPARTS. This Eleventh Supplemental Indenture may be
executed in any number of counterparts each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

                                       -9-

<PAGE>   10

        IN WITNESS WHEREOF, the parties hereto have caused this Eleventh
Supplemental Indenture to be duly executed, and the corporate seal of the
General Partner to be hereunto affixed and attested, as of the day and year
first above written.


                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as General Partner


                              By: /s/ Craig G. Vought
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary


                              SPIEKER PROPERTIES, INC.


                              By: /s/ Craig G. Vought
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary



                                      -10-

<PAGE>   11


                              FIRST TRUST OF CALIFORNIA,
                                NATIONAL ASSOCIATION, as
                              Trustee



                              By: /s/ Jennifer Holder
                                  ----------------------------------------------
                                  Name: Jennifer Holder
                                  Title: Vice President
Attest:

By: /s/ Josephine Libuano
    ----------------------------
    Name: Josephine Libunao
    Title:  Assistant Vice President





                                      -11-

<PAGE>   12


STATE OF  California           )
COUNTY OF San Mateo            ) ss.:

        On the 8th day of December, 1997, before me personally came Craig G.
Vought to me known, who, being by me duly sworn, did depose and say that he is
the EVP and CFO of Spieker Properties, Inc., one of the entities described in
and which executed the above instrument; that he knows the corporate seal of
said corporation; that the seal affixed to the said instrument is such corporate
seal; that it was so affixed by authority of the corporation, and that he signed
his name thereto by like authority.

                              /s/ Melissa Trousdale
                              --------------------------------------------------


   [Seal]



                                      -12-

<PAGE>   13

                                                                       EXHIBIT A


UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A
NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR
ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY. UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS AGENT FOR
REGISTRATION OR TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH
OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

REGISTERED                                                     PRINCIPAL AMOUNT
NO.: R-1                                                              $

CUSIP NO.:  848503 AH 1

                            SPIEKER PROPERTIES, L.P.
                         6.75% NOTE DUE JANUARY 15, 2008

        SPIEKER PROPERTIES, L.P., a California limited partnership (the
"Issuer"), for value received, hereby promises to pay to Cede & Co., or
registered assignee (the "Holder"), upon presentation, the principal sum of
$            on January 15, 2008, and to pay interest on the outstanding
principal amount thereon from January 27, 1998, or from the most recent Interest
Payment Date to which interest has been paid or duly provided for, semi-annually
in arrears on January 15 and July 15 in each year (each an "Interest Payment
Date"), commencing July 15, 1998, and at the Stated Maturity, at the rate of
6.75% per annum, computed on the basis of a 360-day year comprised of twelve
30-day months, until the entire principal amount hereof is paid or duly provided
for. The interest so payable, and punctually paid or duly provided for on any
Interest Payment Date will, as provided in the Indenture (hereinafter defined),
be paid to the person in whose name this Note (the "Note") (or one or more
predecessor Notes) is registered at the close of business on the Regular Record
Date for such Interest Payment Date which shall be the 15th calendar day
preceding the applicable Interest Payment Date. Any such interest not so
punctually paid or duly provided for shall forthwith cease to be payable to the
Holder on such Regular Record Date, and may either be paid to the Person in
whose name this Note (or one or more predecessor Notes) is registered at the
close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee, notice whereof shall be given to Holders of
Notes not more than 15 days and not less than 10 days prior to such Special
Record Date, or may be paid at any time in any other lawful manner not
inconsistent with the

                                       -1-

<PAGE>   14

requirements of any securities exchange on which the Notes may be listed, and
upon such notice as may be required by such exchange, all as more fully provided
in the Indenture. Payments of the principal of, and interest on, this Note will
be made at the office or agency of the Trustee (hereinafter defined) maintained
for that purpose at 180 E. Fifth Street, St. Paul, Minnesota 55101, or elsewhere
as provided in the Indenture, in United States Dollars; provided, however, that
at the option of the Holder hereof, and upon written notice to the Trustee of
not less than five Business Days prior to the applicable Interest Payment Date,
payment of interest may be made by (i) check mailed to the address of the Person
entitled thereto as such address shall appear in the Security Register kept for
the Notes pursuant to Section 305 of the Indenture (the "Note Register") or (ii)
transfer to an account of the Person entitled thereto located inside the United
States.

        This Note is one of a fully authorized issue of securities of the Issuer
issued as a series of securities issued and to be issued under an Indenture,
dated as of December 6, 1995 as supplemented by the Eleventh Supplemental
Indenture dated January 27, 1998 (collectively, the "Indenture"), among the
Issuer and First Trust of California, National Association (the "Trustee," which
term includes any successor trustee under the Indenture with respect to the
Notes), to which Indenture and all indentures supplemental thereto reference is
hereby made for a statement of the respective rights, limitations of rights,
duties and immunities thereunder of the Issuer, the Trustee and the Holders of
the Notes, and of the terms upon which the Notes are, and are to be,
authenticated and delivered. This Note is one of the series designated as the
"6.75% Notes due December 1, 2017," limited in the aggregate principal amount to
$150,000,000.

        The Notes may be redeemed at any time at the option of the Issuer, in
whole or from time to time in part, at a redemption price (the "Redemption
Price") equal to the sum of (i) the principal amount of the Notes (or portion
thereof) being redeemed plus accrued interest thereon to the redemption date and
(ii) the Make-Whole Amount (as defined below), if any, with respect to such
Notes (or portion thereof).

        If notice has been given as provided in the Indenture and funds for the
redemption of any Notes (or any portion thereof) called for redemption shall
have been made available on the redemption date referred to in such notice, such
Notes (or any portion thereof) will cease to bear interest on the date fixed for
such redemption specified in such notice and the only right of the Holders of
the Notes will be to receive payment of the Redemption Price, with respect to
such Notes or portion thereof so redeemed.

        Notice of any optional redemption of any Notes (or any portion thereof)
will be given to Holders at their addresses, as shown in the Note Register, not
more than 60 nor less than 30 days prior to the date fixed for redemption. The
notice of redemption will specify, among other items, the Redemption Price and
the principal amount of the Notes held by such Holder to be redeemed.

        The Issuer will notify the Trustee at least 45 days prior to giving
notice of redemption (or such shorter period as is satisfactory to the Trustee)
of the aggregate principal amount of Notes to be redeemed and their redemption
date. If less than all the Notes are to be redeemed at the option

                                       -2-

<PAGE>   15

of the Issuer, the Trustee shall select, in such manner as it shall deem fair
and appropriate, the Notes to be redeemed in whole or in part.

In the event of redemption of the Notes in part only, a new Note for the amount
of the unredeemed portion hereof shall be issued in the name of the Holder
hereto, upon cancellation hereof.

        As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Notes, the excess, if any, of
        (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Notes being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.

        The Indenture contains provisions for defeasance at any time of (a) the
entire indebtedness of the Issuer on this Note and (b) certain restrictive
covenants and the related

                                       -3-

<PAGE>   16



defaults and Events of Default applicable to the Issuer, in each case, upon
compliance by the Issuer with certain conditions set forth in the Indenture,
which provisions apply to this Note.

        The Issuer is subject to certain covenants contained in the Indenture
with respect to, and for the benefit of the Holders of, the Notes. The Trustee
shall not be obligated to monitor or confirm, on a continuing basis or
otherwise, the Issuer's compliance with the covenants contained in the Indenture
or with respect to reports or other certificates filed under the Indenture;
provided, however, that nothing herein shall relieve the Trustee of any
obligations to monitor the Issuer's timely delivery of all reports and
certificates required under Sections 703 and 1005 of the Indenture and to
fulfill its obligations under Article Six of the Indenture. If an Event of
Default as defined in the Indenture with respect to the Notes shall occur and be
continuing, the principal of the Notes may be declared due and payable in the
manner and with the effect provided in the Indenture.

        As provided in and subject to the provisions of the Indenture, the
Holder of this Note shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Notes, the Holders of not less than a majority in principal amount of the Notes
at the time Outstanding shall have made written request to the Trustee to
institute proceedings in respect of such Event of Default as Trustee and offered
the Trustee reasonable indemnity and shall have failed to institute any such
proceeding, for 60 days after receipt of such notice, request and offer of
indemnity and the Trustee shall not have received from the Holders of a majority
in principal amount of the Notes at the time Outstanding a direction
inconsistent with such request. The foregoing shall not apply to any suit
instituted by the Holder of this Note for the enforcement of any payment of
principal hereof or any interest on or after the respective due dates expressed
herein.

        The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Notes under the Indenture at any
time by the Issuer and the Trustee with the consent of the Holders of not less
than a majority in principal amount of the Outstanding Notes. The Indenture also
contains provisions permitting the Holders of not less than a majority in
principal amount of the Notes at the time Outstanding, on behalf of the Holders
of all Notes, to waive compliance by the Issuer with certain provisions of the
Indenture and certain past defaults under the Indenture and their consequences.
Any such consent or waiver by the Holder of this Note shall be conclusive and
binding upon such Holder and upon all future Holders of this Note and of any
Note issued upon the registration of transfer hereof or in exchange herefor or
in lieu hereof, whether or not notation of such consent or waiver is made upon
this Note.

        No reference herein to the Indenture and no provision of this Note or of
the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of, and interest on, this Note
at the times, place and rate, and in the coin or currency, herein prescribed.

                                       -4-

<PAGE>   17

        As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Note is registrable in the Note Register, upon
surrender of this Note for registration of transfer at the office or agency of
the Issuer in any Place of Payment where the principal of, and interest on, this
Note are payable, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Issuer and the Security Registrar for the
Notes duly executed by, the Holder hereof or his attorney duly authorized
denominations and for the same aggregate principal amount, will be issued to the
designated transferee or transferees.

        The Notes of this series are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
the Notes are exchangeable for a like aggregate principal amount of Notes of
this series of a different authorized denomination, as requested by the Holder
surrendering the same.

        No service charge shall be made for any such registration of transfer or
exchange, but the Issuer may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

        Prior to due presentment of this Note for registration of transfer, the
Issuer, the Trustee and any agent of the Issuer or the Trustee may treat the
Person in whose name this Note is registered as the owner hereof for all
purposes, whether or not this Note be overdue, and neither the Issuer, the
Trustee nor any such agent shall be affected by notice to the contrary.

        All terms used in this Note which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

        THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE
OF NEW YORK.

        Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Issuer has caused "CUSIP" numbers to be
printed on the Notes as a convenience to the Holders of the Notes. No
representation is made as to the correctness or accuracy of such CUSIP numbers
as printed on the Notes, and reliance may be placed only on the other
identification numbers printed hereon.

        Unless the certificate of authentication hereon has been executed by or
on behalf of the Trustee by manual signature, this Note shall not be entitled to
any benefit under the Indenture or be valid or obligatory for any purposes.


                                       -5-

<PAGE>   18


        IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed under its corporate seal this ___ day of _____________.

                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as 
                                    General Partner


                              By: 
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer

(SEAL)

Attest:


By: 
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Vice President - Finance
             and Assistant Secretary



                                       -6-

<PAGE>   19


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION


        This is one of the Notes of the series designated "6.75% Notes due
January 15, 2008" referred to in the within-mentioned Indenture.


FIRST TRUST OF CALIFORNIA,
NATIONAL ASSOCIATION,
as Trustee


By:
    ----------------------------
      Name:
      Title:


                                       -7-

<PAGE>   20

                                 ASSIGNMENT FORM


                   FOR VALUE RECEIVED, the undersigned hereby
                         sells, assigns and transfers to




  -----------------------------------------------------------------------------
     (Insert Social Security number or other identifying number of assignee)

  -----------------------------------------------------------------------------
  (Please print or typewrite name and address, including zip, code of assignee)


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


the within Note of Spieker Properties, L.P. and hereby does irrevocably
constitute and appoint

- -----------------------------------------------------------------------------
Attorney to transfer said Note on the books of the within-named Issuer with full
power of substitution in the premises.

Dated:
      ------------                  -----------------------------------

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


Signature(s) must be guaranteed by an eligible Guarantor Institution (banks,
stock brokers, savings and loan associations and credit unions) with membership
in an approved signature guarantee medallion program pursuant to Securities and
Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it
appears on the first page of the within Note in every particular, without
alteration or enlargement or any change whatever.

                                       -8-


<PAGE>   1
                                                                    EXHIBIT 4.15


                         TWELFTH SUPPLEMENTAL INDENTURE


        TWELFTH SUPPLEMENTAL INDENTURE, dated as of February 2, 1998 (this
"Twelfth Supplemental Indenture"), among Spieker Properties, Inc., a
corporation organized under the laws of Maryland (the "General Partner"),
Spieker Properties, L.P., a limited partnership organized under the laws of
California (the "Issuer"), and First Trust of California, National Association,
as Trustee (the "Trustee").

                              W I T N E S S E T H:

        WHEREAS, the Issuer, the General Partner and State Street Bank and Trust
Company ("State Street") executed and delivered an Indenture, dated as of
December 6, 1995 (as supplemented hereby, the "Indenture"), to provide for the
issuance by the Issuer from time to time of debt securities evidencing its
unsecured indebtedness;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, the Issuer and
the General Partner appointed the Trustee as trustee with respect to the series
of securities established by that Supplemental Indenture and future series of
securities under the Indenture, and the Trustee accepted such appointment;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, State Street
remains trustee of all series of securities prior to those established by the
Ninth Supplemental Indenture;

        WHEREAS, pursuant to Board Resolution, the Issuer has authorized the
issuance of $125,000,000 of its 6.875% Notes Due February 1, 2005 (the "Notes");

        WHEREAS, the Issuer desires to establish the terms of the Notes in
accordance with Section 301 of the Indenture and to establish the form of the
Notes in accordance with Section 201 of the Indenture.


                                    ARTICLE 1

                                      TERMS

        SECTION 101. TERMS OF NOTES. The following terms relating to the Notes
are hereby established:

               (1) The Notes shall constitute a series of Securities having the
        title "6.875% Notes Due February 1, 2005."

               (2) The aggregate principal amount of the Notes that may be
        authenticated and delivered under the Indenture (except for Notes
        authenticated and delivered upon registration of transfer of, or in
        exchange for, or in lieu of,

                                       -1-

<PAGE>   2


        other Notes pursuant to Sections 304, 305, 306, 906, 1107 or 1305 of the
        Indenture) shall be up to $125,000,000.

               (3) The entire outstanding principal of the Notes shall be
        payable on February 1, 2005 (the "Stated Maturity Date").

               (4) The rate at which the Notes shall bear interest shall be
        6.875%; the date from which interest shall accrue shall be February 2,
        1998; the Interest Payment Dates for the Notes on which interest will be
        payable shall be February 1 and August 1 in each year, beginning August
        1, 1998; the Regular Record Dates for the interest payable on the Notes
        on any Interest Payment Date shall be the 15th calendar day preceding
        the applicable Interest Payment Date; and the basis upon which interest
        shall be calculated shall be that of a 360-day year consisting of twelve
        30-day months.

               (5) The Place of Payment where the principal of and interest on
        the Notes shall be payable and Notes may be surrendered for the
        registration of transfer or exchange shall be the Corporate Trust Office
        of the Trustee in St. Paul, Minnesota. The place where notices or
        demands to or upon the Issuer in respect of the Notes and the Indenture
        may be served shall be the corporate trust office of the Trustee at One
        California Street, Suite 400, San Francisco, California 94111.

               (6) (A) The Notes may be redeemed at any time at the option of
        the Issuer, in whole, or from time to time in part, at a redemption
        price equal to the sum of (i) the principal amount of the Notes (or
        portion thereof) being redeemed plus accrued interest thereon to the
        redemption date and (ii) the Make-Whole Amount (as defined below), if
        any, with respect to such Notes (or portion thereof) (the "Redemption
        Price").

               If notice has been given as provided in the Indenture and funds
        for the redemption of any Notes (or any portion thereof) called for
        redemption shall have been made available on the redemption date
        referred to in such notice, such Notes (or any portion thereof) will
        cease to bear interest on the date fixed for such redemption specified
        in such notice and the only right of the Holders of the Notes will be to
        receive payment of the Redemption Price, with respect to such Notes or
        portion thereof so redeemed.

                Notice of any optional redemption of any Notes (or any portion
        thereof) will be given to Holders at their addresses, as shown in the
        security register for the Notes, not more than 60 nor less than 30 days
        prior to the date fixed for redemption. The notice of redemption will
        specify, among other items, the Redemption Price and the principal
        amount of the Notes held by such Holder to be redeemed. On the third
        Business Day preceding the date notice of redemption is given, the
        Company will notify the Trustee of the Redemption Price and the Trustee
        may rely and shall be fully protected in acting upon the determination
        of the Company as to such Redemption Price.


                                       -2-

<PAGE>   3

               The Issuer will notify the Trustee in writing at least 45 days
        prior to giving notice of redemption (or such shorter period as is
        satisfactory to the Trustee in its sole discretion) of the aggregate
        principal amount of Notes to be redeemed and their redemption date. If
        less than all the Notes are to be redeemed at the option of the Issuer,
        the Trustee shall select by lot, the Notes to be redeemed in whole or in
        part.

               In the event of redemption of the Notes in part only, a new Note
        for the amount of the unredeemed portion thereof shall be issued in the
        name of the Holder thereto, upon cancellation thereof.

               (B) As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Notes, the excess, if any, of
        (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Notes being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.


                                       -3-

<PAGE>   4

               (7) The Notes shall not be redeemable at the option of any Holder
        thereof, upon the occurrence of any particular circumstances or
        otherwise. The Notes will not have the benefit of any sinking fund.

               (8) The Notes shall be issuable in denominations of $1,000 and
        any integral multiple thereof.

               (9) The Trustee shall also be the Security Registrar and Paying
        Agent for the Notes.

               (10) The entire outstanding principal amount plus the Make-Whole
        Amount of the Notes shall be payable upon declaration of acceleration of
        the maturity thereof pursuant to Section 502 of the Indenture.

               (11) Payments of the principal of and interest on the Notes shall
        be made in U.S. Dollars, and the Notes shall be denominated in U.S.
        Dollars.

               (12) The Notes will be payable on the Stated Maturity Date in an
        amount equal to the principal amount thereof plus any unpaid interest
        accrued to the Stated Maturity Date.

               (13) The Holders of the Notes shall have no special rights in
        addition to those provided in the Indenture upon the occurrence of any
        particular events.

               (14) (A) There shall be no deletions from, modifications of or
        additions to the Events of Default with respect to the Notes set forth
        in the Indenture.

                    (B) There shall be the following additions to the covenants
        set forth in the Indenture with respect to the Notes, which shall be
        effective only for so long as any of the Notes are Outstanding:

                      Limitations On Incurrence of Debt. The Issuer will not,
               and will not permit any Subsidiary to, incur any Debt (as defined
               below), other than inter-company debt representing Debt to which
               the only parties are Spieker Properties, Inc., a Maryland
               corporation (the "General Partner"), the Issuer and any of their
               Subsidiaries (but only so long as such Debt is held solely by any
               of the General Partner, the Issuer and any Subsidiary) that is
               subordinate in right of payment to the Notes if, immediately
               after giving effect to the incurrence of such additional Debt,
               the aggregate principal amount of all outstanding Debt of the
               Issuer and its Subsidiaries on a consolidated basis is greater
               than 60% of the sum of (i) Total Assets (as defined below) as of
               the end of the calendar quarter covered in the Issuer's Annual
               Report on Form 10-K or Quarterly Report on Form 10-Q, as the case
               may be, most recently filed with the Trustee (or such reports of
               the General Partner if filed by the Issuer with the Trustee in
               lieu of filing its own reports) prior

                                       -4-

<PAGE>   5

               to the incurrence of such additional Debt and (ii) the increase
               in Total Assets from the end of such quarter including, without
               limitation, any increase in Total Assets resulting from the
               incurrence of such additional Debt (such increase, together with
               the Total Assets, is referred to as "Adjusted Total Assets").

                      In addition to the foregoing limitation on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt if the ratio of Consolidated Income Available
               for Debt Service to the Annual Service Charge (in each case as
               defined below) for the four consecutive fiscal quarters most
               recently ended prior to the date on which such additional Debt is
               to be incurred shall have been less than 1.5 to 1, on a pro forma
               basis after giving effect to the incurrence of such Debt and to
               the application of the proceeds therefrom, and calculated on the
               assumption that (i) such Debt and any other Debt incurred by the
               Issuer or its Subsidiaries since the first day of such
               four-quarter period and the application of the proceeds
               therefrom, including to refinance other Debt, had occurred at the
               beginning of such period, (ii) the repayment or retirement of any
               other Debt by the Issuer or its Subsidiaries since the first day
               of such four-quarter period had been incurred, repaid or retired
               at the beginning of such period (except that, in making such
               computation, the amount of Debt under any revolving credit
               facility shall be computed based upon the average daily balance
               of such Debt during such period), (iii) the income earned on any
               increase in Adjusted Total Assets since the end of such
               four-quarter period had been earned, on an annualized basis,
               during such period, and (iv) in the case of any acquisition or
               disposition by the Issuer or any Subsidiary of any asset or group
               of assets since the first day of such four-quarter period,
               including, without limitation, by merger, stock purchase or sale,
               or asset purchase or sale, such acquisition or disposition or any
               related repayment of Debt had occurred as of the first day of
               such period with the appropriate adjustments with respect to such
               acquisition or disposition being included in such pro forma
               calculation.

                      In addition to the foregoing limitations on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt secured by any mortgage, lien, charge, pledge,
               encumbrance or security interest of any kind upon any of the
               property of the Issuer or any Subsidiary ("Secured Debt"),
               whether owned at the date of the Indenture or thereafter
               acquired, if, immediately after giving effect to the incurrence
               of such additional Secured Debt, the aggregate principal amount
               of all outstanding Secured Debt is greater than 40% of Adjusted
               Total Assets.

                      For purposes of the foregoing provisions regarding the
               limitation on the incurrence of Debt, Debt shall be deemed to be
               "incurred" by the Issuer or a Subsidiary whenever the Issuer and
               its Subsidiary shall create, assume, guarantee or otherwise
               become liable in respect thereof.


                                       -5-

<PAGE>   6



                      Maintenance of Total Unencumbered Assets. The Issuer is
               required to maintain Total Unencumbered Assets of not less than
               165% of the aggregate outstanding principal amount of all
               outstanding Unsecured Debt.

                      As used herein:

                      "Annual Service Charge" as of any date means the amount
               which is expensed in any 12-month period for interest on Debt of
               the Issuer and its Subsidiaries.

                      "Consolidated Income Available For Debt Service" for any
               period means Consolidated Net Income plus amounts which have been
               deducted for (a) interest on Debt of the Issuer and its
               Subsidiaries, (b) provision for taxes of the Issuer and its
               Subsidiaries based on income, (c) amortization of Debt discount,
               (d) provisions for gains and losses on properties, (e)
               depreciation and amortization, (f) the effect of any noncash
               charge resulting from a change in accounting principles in
               determining Consolidated Net Income for such period and (g)
               amortization of deferred charges.

                      "Consolidated Net Income" for any period means the amount
               of consolidated net income (or loss) of the Issuer and its
               Subsidiaries for such period determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                      "Debt" of the Issuer or any Subsidiary means any
               indebtedness of the Issuer or such Subsidiary, as applicable,
               whether or not contingent, in respect of (i) borrowed money
               evidenced by bonds, notes, Notes or similar instruments, (ii)
               indebtedness secured by any mortgage, pledge, lien, charge,
               encumbrance or any security interest existing on property owned
               by the Issuer or such Subsidiary, (iii) the reimbursement
               obligations, contingent or otherwise, in connection with any
               letters of credit actually issued or amounts representing the
               balance that constitutes an accrued expense or trade payable or
               (iv) any lease of property by the Issuer or such Subsidiary as
               lessee which is reflected in the Issuer's consolidated balance
               sheet as a capitalized lease in accordance with generally
               accepted accounting principles, in the case of items of
               indebtedness under (i) through (iii) above to the extent that any
               such items (other than letters of credit) would appear as a
               liability on the Issuer's consolidated balance sheet in
               accordance with generally accepted accounting principles, and
               also includes, to the extent not otherwise included, any
               obligation by the Issuer or such Subsidiary to be liable for, or
               to pay, as obligor, guarantor or otherwise (other than for
               purposes of collection in the ordinary course of business),
               indebtedness of another person (other than the Issuer or any
               Subsidiary).


                                       -6-

<PAGE>   7

                      "Subsidiary" means a corporation, partnership or limited
               liability company, a majority of the outstanding voting stock,
               partnership interests or membership interests, as the case may
               be, of which is owned or controlled, directly or indirectly, by
               the Issuer or by one or more other Subsidiaries of the Issuer.
               For the purposes of this definition, "voting stock" means stock
               having the voting power for the election of directors, general
               partners, managers or trustees, as the case may be, whether at
               all times or only so long as no senior class of stock has such
               voting power by reason of any contingency.

                      "Total Assets" as of any date means the sum of (i)
               Undepreciated Real Estate Assets and (ii) all other assets of the
               Issuer and its Subsidiaries on a consolidated basis determined in
               accordance with generally accepted accounting principles (but
               excluding intangibles and accounts receivable).

                      "Total Unencumbered Assets" as of any date means the sum
               of (i) those Undepreciated Real Estate Assets which have not been
               pledged, mortgaged or otherwise encumbered by the owner thereof
               to secure Debt, excluding infrastructure assessment bonds, and
               (ii) all other assets of the Issuer and its Subsidiaries
               determined in accordance with generally accepted accounting
               principles (but excluding intangibles and accounts receivable)
               which have not been pledged, mortgaged or otherwise encumbered by
               the owner thereof to secure Debt.

                      "Undepreciated Real Estate Assets" as of any date means
               the cost (original cost plus capital improvements) of real estate
               assets of the Issuer and its Subsidiaries on such date, before
               depreciation and amortization, determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                      "Unsecured Debt" as of any date means Debt which is not
               secured by any mortgage, lien, charge, pledge, encumbrance or
               security interest of any kind upon any of the properties of the
               Issuer or any Subsidiary.

                      (C) The Trustee shall not be obligated to monitor or 
        confirm, on a continuing basis or otherwise, the Issuer's compliance
        with the covenants contained in this subsection or with respect to
        reports or other documents filed under the Indenture; provided, however,
        that nothing herein shall relieve the Trustee of any obligations to
        monitor the Issuer's timely delivery of all reports and certificates
        required under Sections 703 and 1005 of the Indenture and to fulfill its
        obligations under Article Six of the Indenture.

               (15) The Notes shall be issuable only as Registered Securities in
        permanent global form (without coupons). Beneficial owners of interests
        in the permanent global Notes may exchange such interests for Notes of
        like tenor or any authorized form and

                                       -7-

<PAGE>   8


        denomination only in the manner provided in Section 305 of the
        Indenture. DTC shall be the depository with respect to the permanent
        global Note.

               (16) The Notes shall not be issuable as Bearer Securities.

               (17) Interest on any Note shall be payable only to the Person in
        whose name that Note (or one or more predecessor Notes thereof) is
        registered at the close of business on the Regular Record Date for such
        interest.

               (18) Sections 1402 and 1403 of the Indenture shall be applicable
        to the Notes.

               (19) The Notes shall not be issuable in definitive form except
        under the circumstances described in Section 305 of the Indenture.

               (20) Articles Sixteen and Seventeen of the Indenture shall not be
        applicable to the Notes.

               (21) The Issuer shall not pay Additional Amounts with respect to
        the Notes as contemplated by Section 1009 of the Indenture.

               (22) The Notes shall not be subordinated to any other debt of the
        Issuer, and shall constitute senior unsecured obligations of the Issuer.

        SECTION 102. FORM OF NOTE. The form of the Note is attached hereto as
Exhibit A.

                                   ARTICLE II

                                  MISCELLANEOUS

        SECTION 201. DEFINITIONS. Capitalized terms used but not defined in this
Twelfth Supplemental Indenture shall have the meanings ascribed thereto in the
Indenture.

        SECTION 202. CONFIRMATION OF INDENTURE. The Indenture, as heretofore
supplemented and amended by this Twelfth Supplemental Indenture, is in all
respects ratified and confirmed, and the Indenture, this Twelfth Supplemental
Indenture and all indentures supplemental thereto shall be read, taken and
construed as one and the same instrument.

        SECTION 203. CONCERNING THE TRUSTEE. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Twelfth Supplemental
Indenture other than as set forth in the Indenture and, in carrying out its
responsibilities hereunder, shall have all of the rights, protections and
immunities which it possesses under the Indenture.


                                       -8-

<PAGE>   9

        SECTION 204. GOVERNING LAW. This Twelfth Supplemental Indenture, the
Indenture and the Securities shall be governed by and construed in accordance
with the law of the State of New York.

        SECTION 205. SEPARABILITY. In case any provision in this Twelfth 
Supplemental Indenture shall for any reason be held to be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

        SECTION 206. COUNTERPARTS. This Twelfth Supplemental Indenture may be
executed in any number of counterparts each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

                                       -9-

<PAGE>   10

        IN WITNESS WHEREOF, the parties hereto have caused this Twelfth
Supplemental Indenture to be duly executed, and the corporate seal of the
General Partner to be hereunto affixed and attested, as of the day and year
first above written.


                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as General Partner


                              By: /s/ Craig G. Vought                    
                                  ----------------------------------------------
                                   Name:  Craig G. Vought
                                   Title: Executive Vice President
                                            and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein                         
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary


                              SPIEKER PROPERTIES, INC.


                              By: /s/ Craig G. Vought                     
                                  ----------------------------------------------
                                   Name:  Craig G. Vought
                                   Title: Executive Vice President
                                            and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein                            
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary



                                      -10-

<PAGE>   11


                              FIRST TRUST OF CALIFORNIA,
                                NATIONAL ASSOCIATION, as
                              Trustee



                              By: /s/ Jennifer Holder
                                  ----------------------------------------------
                                  Name: Jennifer Holder
                                  Title: Vice President
Attest:

By: /s/ Josephine Libunao
    ----------------------------
    Name: Josephine Libunao
    Title:  Assistant Vice President





                                      -11-

<PAGE>   12


STATE OF  California           )
COUNTY OF San Mateo            ) ss.:

        On February 2, 1998, before me personally came Craig G. Vought to me
known, who, being by me duly sworn, did depose and say that he is the EVP and
CFO of Spieker Properties, Inc., one of the entities described in and which
executed the above instrument; that he knows the corporate seal of said
corporation; that the seal affixed to the said instrument is such corporate
seal; that it was so affixed by authority of the corporation, and that he signed
his name thereto by like authority.

                                        /s/ Melissa Trousdale
                              --------------------------------------------------


   [Seal]



                                      -12-

<PAGE>   13

                                                                       EXHIBIT A


UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A
NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR
ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY. UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS AGENT FOR
REGISTRATION OR TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH
OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

REGISTERED                                                     PRINCIPAL AMOUNT
NO.: R-1                                                              $

CUSIP NO.:  848503 AJ 1

                            SPIEKER PROPERTIES, L.P.
                         6.875% NOTE DUE FEBRUARY 1, 2005

        SPIEKER PROPERTIES, L.P., a California limited partnership (the
"Issuer"), for value received, hereby promises to pay to Cede & Co., or
registered assignee (the "Holder"), upon presentation, the principal sum of
$            on February 1, 2005, and to pay interest on the outstanding
principal amount thereon from February 2, 1998, or from the most recent Interest
Payment Date to which interest has been paid or duly provided for, semi-annually
in arrears on February 1 and August 1, in each year (each an "Interest Payment
Date"), commencing August 1, 1998, and at the Stated Maturity, at the rate of
6.875% per annum, computed on the basis of a 360-day year comprised of twelve
30-day months, until the entire principal amount hereof is paid or duly provided
for. The interest so payable, and punctually paid or duly provided for on any
Interest Payment Date will, as provided in the Indenture (hereinafter defined),
be paid to the person in whose name this Note (the "Note") (or one or more
predecessor Notes) is registered at the close of business on the Regular Record
Date for such Interest Payment Date which shall be the 15th calendar day
preceding the applicable Interest Payment Date. Any such interest not so
punctually paid or duly provided for shall forthwith cease to be payable to the
Holder on such Regular Record Date, and may either be paid to the Person in
whose name this Note (or one or more predecessor Notes) is registered at the
close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee, notice whereof shall be given to Holders of
Notes not more than 15 days and not less than 10 days prior to such Special
Record

                                       -1-

<PAGE>   14
Date, or may be paid at any time in any other lawful manner not inconsistent
with the requirements of any securities exchange on which the Notes may be
listed, and upon such notice as may be required by such exchange, all as more
fully provided in the Indenture. Payments of the principal of, and interest on,
this Note will be made at the office or agency of the Trustee (hereinafter
defined) maintained for that purpose at 180 E. Fifth Street, St. Paul, Minnesota
55101, or elsewhere as provided in the Indenture, in United States Dollars;
provided, however, that at the option of the Holder hereof, and upon written
notice to the Trustee of not less than five Business Days prior to the
applicable Interest Payment Date, payment of interest may be made by (i) check
mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register kept for the Notes pursuant to Section 305 of
the Indenture (the "Note Register") or (ii) transfer to an account of the Person
entitled thereto located inside the United States.

        This Note is one of a fully authorized issue of securities of the Issuer
issued as a series of securities issued and to be issued under an Indenture,
dated as of December 6, 1995 as supplemented by the Twelfth Supplemental
Indenture dated February 2, 1998 (collectively, the "Indenture"), among the
Issuer and First Trust of California, National Association (the "Trustee," which
term includes any successor trustee under the Indenture with respect to the
Notes), to which Indenture and all indentures supplemental thereto reference is
hereby made for a statement of the respective rights, limitations of rights,
duties and immunities thereunder of the Issuer, the Trustee and the Holders of
the Notes, and of the terms upon which the Notes are, and are to be,
authenticated and delivered. This Note is one of the series designated as the
"6.875% Notes due February 1, 2005," limited in the aggregate principal amount
to $125,000,000.

        The Notes may be redeemed at any time at the option of the Issuer, in
whole or from time to time in part, at a redemption price (the "Redemption
Price") equal to the sum of (i) the principal amount of the Notes (or portion
thereof) being redeemed plus accrued interest thereon to the redemption date and
(ii) the Make-Whole Amount (as defined below), if any, with respect to such
Notes (or portion thereof).

        If notice has been given as provided in the Indenture and funds for the
redemption of any Notes (or any portion thereof) called for redemption shall
have been made available on the redemption date referred to in such notice, such
Notes (or any portion thereof) will cease to bear interest on the date fixed for
such redemption specified in such notice and the only right of the Holders of
the Notes will be to receive payment of the Redemption Price, with respect to
such Notes or portion thereof so redeemed.

        Notice of any optional redemption of any Notes (or any portion thereof)
will be given to Holders at their addresses, as shown in the Note Register, not
more than 60 nor less than 30 days prior to the date fixed for redemption. The
notice of redemption will specify, among other items, the Redemption Price and
the principal amount of the Notes held by such Holder to be redeemed.

        The Issuer will notify the Trustee at least 45 days prior to giving
notice of redemption (or such shorter period as is satisfactory to the Trustee)
of the aggregate principal amount of Notes to be redeemed and their redemption
date. If less than all the Notes are to be redeemed at the option

                                       -2-

<PAGE>   15

of the Issuer, the Trustee shall select, in such manner as it shall deem fair
and appropriate, the Notes to be redeemed in whole or in part.

In the event of redemption of the Notes in part only, a new Note for the amount
of the unredeemed portion hereof shall be issued in the name of the Holder
hereto, upon cancellation hereof.

        As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Notes, the excess, if any, of
        (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Notes being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.

        The Indenture contains provisions for defeasance at any time of (a) the
entire indebtedness of the Issuer on this Note and (b) certain restrictive
covenants and the related

                                       -3-

<PAGE>   16



defaults and Events of Default applicable to the Issuer, in each case, upon
compliance by the Issuer with certain conditions set forth in the Indenture,
which provisions apply to this Note.

        The Issuer is subject to certain covenants contained in the Indenture
with respect to, and for the benefit of the Holders of, the Notes. The Trustee
shall not be obligated to monitor or confirm, on a continuing basis or
otherwise, the Issuer's compliance with the covenants contained in the Indenture
or with respect to reports or other certificates filed under the Indenture;
provided, however, that nothing herein shall relieve the Trustee of any
obligations to monitor the Issuer's timely delivery of all reports and
certificates required under Sections 703 and 1005 of the Indenture and to
fulfill its obligations under Article Six of the Indenture. If an Event of
Default as defined in the Indenture with respect to the Notes shall occur and be
continuing, the principal of the Notes may be declared due and payable in the
manner and with the effect provided in the Indenture.

        As provided in and subject to the provisions of the Indenture, the
Holder of this Note shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Notes, the Holders of not less than a majority in principal amount of the Notes
at the time Outstanding shall have made written request to the Trustee to
institute proceedings in respect of such Event of Default as Trustee and offered
the Trustee reasonable indemnity and shall have failed to institute any such
proceeding, for 60 days after receipt of such notice, request and offer of
indemnity and the Trustee shall not have received from the Holders of a majority
in principal amount of the Notes at the time Outstanding a direction
inconsistent with such request. The foregoing shall not apply to any suit
instituted by the Holder of this Note for the enforcement of any payment of
principal hereof or any interest on or after the respective due dates expressed
herein.

        The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Notes under the Indenture at any
time by the Issuer and the Trustee with the consent of the Holders of not less
than a majority in principal amount of the Outstanding Notes. The Indenture also
contains provisions permitting the Holders of not less than a majority in
principal amount of the Notes at the time Outstanding, on behalf of the Holders
of all Notes, to waive compliance by the Issuer with certain provisions of the
Indenture and certain past defaults under the Indenture and their consequences.
Any such consent or waiver by the Holder of this Note shall be conclusive and
binding upon such Holder and upon all future Holders of this Note and of any
Note issued upon the registration of transfer hereof or in exchange herefor or
in lieu hereof, whether or not notation of such consent or waiver is made upon
this Note.

        No reference herein to the Indenture and no provision of this Note or of
the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of, and interest on, this Note
at the times, place and rate, and in the coin or currency, herein prescribed.

                                       -4-

<PAGE>   17

        As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Note is registrable in the Note Register, upon
surrender of this Note for registration of transfer at the office or agency of
the Issuer in any Place of Payment where the principal of, and interest on, this
Note are payable, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Issuer and the Security Registrar for the
Notes duly executed by, the Holder hereof or his attorney duly authorized
denominations and for the same aggregate principal amount, will be issued to the
designated transferee or transferees.

        The Notes of this series are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
the Notes are exchangeable for a like aggregate principal amount of Notes of
this series of a different authorized denomination, as requested by the Holder
surrendering the same.

        No service charge shall be made for any such registration of transfer or
exchange, but the Issuer may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

        Prior to due presentment of this Note for registration of transfer, the
Issuer, the Trustee and any agent of the Issuer or the Trustee may treat the
Person in whose name this Note is registered as the owner hereof for all
purposes, whether or not this Note be overdue, and neither the Issuer, the
Trustee nor any such agent shall be affected by notice to the contrary.

        All terms used in this Note which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

        THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE
OF NEW YORK.

        Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Issuer has caused "CUSIP" numbers to be
printed on the Notes as a convenience to the Holders of the Notes. No
representation is made as to the correctness or accuracy of such CUSIP numbers
as printed on the Notes, and reliance may be placed only on the other
identification numbers printed hereon.

        Unless the certificate of authentication hereon has been executed by or
on behalf of the Trustee by manual signature, this Note shall not be entitled to
any benefit under the Indenture or be valid or obligatory for any purposes.


                                       -5-

<PAGE>   18


        IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed under its corporate seal this ___ day of ___________, 1998.

                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as 
                                    General Partner


                              By: 
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer

(SEAL)

Attest:


By: 
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Vice President - Finance
             and Assistant Secretary



                                       -6-

<PAGE>   19


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION


        This is one of the Notes of the series designated "6.875% Notes due
February 1, 2005" referred to in the within-mentioned Indenture.


FIRST TRUST OF CALIFORNIA,
NATIONAL ASSOCIATION,
as Trustee


By:
    ----------------------------
      Name:
      Title:


                                       -7-

<PAGE>   20

                                 ASSIGNMENT FORM


                   FOR VALUE RECEIVED, the undersigned hereby
                         sells, assigns and transfers to




  -----------------------------------------------------------------------------
     (Insert Social Security number or other identifying number of assignee)

  -----------------------------------------------------------------------------
  (Please print or typewrite name and address, including zip, code of assignee)


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


the within Note of Spieker Properties, L.P. and hereby does irrevocably
constitute and appoint

- -----------------------------------------------------------------------------
Attorney to transfer said Note on the books of the within-named Issuer with full
power of substitution in the premises.

Dated:
      ------------                  -----------------------------------

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


Signature(s) must be guaranteed by an eligible Guarantor Institution (banks,
stock brokers, savings and loan associations and credit unions) with membership
in an approved signature guarantee medallion program pursuant to Securities and
Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it
appears on the first page of the within Note in every particular, without
alteration or enlargement or any change whatever.

                                       -8-


<PAGE>   1
                                                                    EXHIBIT 4.16


                       THIRTEENTH SUPPLEMENTAL INDENTURE


        THIRTEENTH SUPPLEMENTAL INDENTURE, dated as of February 2, 1998 (this
"Thirteenth Supplemental Indenture"), among Spieker Properties, Inc., a
corporation organized under the laws of Maryland (the "General Partner"),
Spieker Properties, L.P., a limited partnership organized under the laws of
California (the "Issuer"), and First Trust of California, National Association,
as Trustee (the "Trustee").

                              W I T N E S S E T H:

        WHEREAS, the Issuer, the General Partner and State Street Bank and Trust
Company ("State Street") executed and delivered an Indenture, dated as of
December 6, 1995 (as supplemented hereby, the "Indenture"), to provide for the
issuance by the Issuer from time to time of debt securities evidencing its
unsecured indebtedness;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, the Issuer and
the General Partner appointed the Trustee as trustee with respect to the series
of securities established by that Supplemental Indenture and future series of
securities under the Indenture, and the Trustee accepted such appointment;

        WHEREAS, pursuant to the Ninth Supplemental Indenture, State Street
remains trustee of all series of securities prior to those established by the
Ninth Supplemental Indenture;

        WHEREAS, pursuant to Board Resolution, the Issuer has authorized the
issuance of $1,500,000 of its 7% Notes Due February 1, 2007 (the "Notes");

        WHEREAS, the Issuer desires to establish the terms of the Notes in
accordance with Section 301 of the Indenture and to establish the form of the
Notes in accordance with Section 201 of the Indenture.


                                    ARTICLE 1

                                      TERMS

        SECTION 101. TERMS OF NOTES. The following terms relating to the Notes
are hereby established:

               (1) The Notes shall constitute a series of Securities having the
        title "7% Notes Due February 1, 2007."

               (2) The aggregate principal amount of the Notes that may be
        authenticated and delivered under the Indenture (except for Notes
        authenticated and delivered upon registration of transfer of, or in
        exchange for, or in lieu of,

                                       -1-

<PAGE>   2
other Notes pursuant to Sections 304, 305, 306, 906, 1107 or 1305 of the
Indenture) shall be up to $1,500,000.

        (3)     The entire outstanding principal of the Notes shall be payable
on February 1, 2007 (the "Stated Maturity Date").

        (4)     The rate at which the Notes shall bear interest shall be 7%; the
date from which interest shall accrue shall be February 2, 1998; the Interest
Payment Dates for the Notes on which interest will be payable shall be February
1 and August 1 in each year, beginning August 1, 1998; the Regular Record Dates
for the interest payable on the Notes on any Interest Payment Date shall be the
15th calendar day preceding the applicable Interest Payment Date; and the basis
upon which interest shall be calculated shall be that of a 360-day year
consisting of twelve 30-day months.

        (5)     The Place of Payment where the principal of and interest on the
Notes shall be payable and Notes may be surrendered for the registration of
transfer or exchange shall be the Corporate Trust Office of the Trustee in St.
Paul, Minnesota. The place where notices or demands to or upon the Issuer in
respect of the Notes and the Indenture may be served shall be the corporate
trust office of the Trustee at One California Street, Suite 400, San Francisco,
California 94111.

        (6)     (A)     The Notes may be redeemed at any time at the option of
the Issuer, in whole, or from time to time in part, at a redemption price equal
to the sum of (i) the principal amount of the Notes (or portion thereof) being
redeemed plus accrued interest thereon to the redemption date and (ii) the
Make-Whole Amount (as defined below), if any, with respect to such Notes (or
portion thereof) (the "Redemption Price").

        If notice has been given as provided in the Indenture and funds for the
redemption of any Notes (or any portion thereof) called for redemption shall
have been made available on the redemption date referred to in such notice, such
Notes (or any portion thereof) will cease to bear interest on the date fixed for
such redemption specified in such notice and the only right of the Holders of
the Notes will be to receive payment of the Redemption Price, with respect to
such Notes or portion thereof so redeemed.

        Notice of any optional redemption of any Notes (or any portion thereof)
will be given to Holders at their addresses, as shown in the security register
for the Notes, not more than 60 nor less than 30 days prior to the date fixed
for redemption. The notice of redemption will specify, among other items, the
Redemption Price and the principal amount of the Notes held by such Holder to be
redeemed. On the third Business Day preceding the date notice of redemption is
given, the Company will notify the Trustee of the Redemption Price and the
Trustee may rely and shall be fully protected in acting upon the determination
of the Company as to such Redemption Price.


                                       -2-

<PAGE>   3

               The Issuer will notify the Trustee in writing at least 45 days
        prior to giving notice of redemption (or such shorter period as is
        satisfactory to the Trustee in its sole discretion) of the aggregate
        principal amount of Notes to be redeemed and their redemption date. If
        less than all the Notes are to be redeemed at the option of the Issuer,
        the Trustee shall select by lot, the Notes to be redeemed in whole or in
        part.

               In the event of redemption of the Notes in part only, a new Note
        for the amount of the unredeemed portion thereof shall be issued in the
        name of the Holder thereto, upon cancellation thereof.

               (B) As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Notes, the excess, if any, of
        (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Notes being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.


                                       -3-

<PAGE>   4

               (7) The Notes shall not be redeemable at the option of any Holder
        thereof, upon the occurrence of any particular circumstances or
        otherwise. The Notes will not have the benefit of any sinking fund.

               (8) The Notes shall be issuable in denominations of $1,000 and
        any integral multiple thereof.

               (9) The Trustee shall also be the Security Registrar and Paying
        Agent for the Notes.

               (10) The entire outstanding principal amount plus the Make-Whole
        Amount of the Notes shall be payable upon declaration of acceleration of
        the maturity thereof pursuant to Section 502 of the Indenture.

               (11) Payments of the principal of and interest on the Notes shall
        be made in U.S. Dollars, and the Notes shall be denominated in U.S.
        Dollars.

               (12) The Notes will be payable on the Stated Maturity Date in an
        amount equal to the principal amount thereof plus any unpaid interest
        accrued to the Stated Maturity Date.

               (13) The Holders of the Notes shall have no special rights in
        addition to those provided in the Indenture upon the occurrence of any
        particular events.

               (14) (A) There shall be no deletions from, modifications of or
        additions to the Events of Default with respect to the Notes set forth
        in the Indenture.

               (B) There shall be the following additions to the covenants set
        forth in the Indenture with respect to the Notes, which shall be
        effective only for so long as any of the Notes are Outstanding:

                      Limitations On Incurrence of Debt. The Issuer will not,
               and will not permit any Subsidiary to, incur any Debt (as defined
               below), other than inter-company debt representing Debt to which
               the only parties are Spieker Properties, Inc., a Maryland
               corporation (the "General Partner"), the Issuer and any of their
               Subsidiaries (but only so long as such Debt is held solely by any
               of the General Partner, the Issuer and any Subsidiary) that is
               subordinate in right of payment to the Notes if, immediately
               after giving effect to the incurrence of such additional Debt,
               the aggregate principal amount of all outstanding Debt of the
               Issuer and its Subsidiaries on a consolidated basis is greater
               than 60% of the sum of (i) Total Assets (as defined below) as of
               the end of the calendar quarter covered in the Issuer's Annual
               Report on Form 10-K or Quarterly Report on Form 10-Q, as the case
               may be, most recently filed with the Trustee (or such reports of
               the General Partner if filed by the Issuer with the Trustee in
               lieu of filing its own reports) prior

                                       -4-

<PAGE>   5

               to the incurrence of such additional Debt and (ii) the increase
               in Total Assets from the end of such quarter including, without
               limitation, any increase in Total Assets resulting from the
               incurrence of such additional Debt (such increase, together with
               the Total Assets, is referred to as "Adjusted Total Assets").

                      In addition to the foregoing limitation on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt if the ratio of Consolidated Income Available
               for Debt Service to the Annual Service Charge (in each case as
               defined below) for the four consecutive fiscal quarters most
               recently ended prior to the date on which such additional Debt is
               to be incurred shall have been less than 1.5 to 1, on a pro forma
               basis after giving effect to the incurrence of such Debt and to
               the application of the proceeds therefrom, and calculated on the
               assumption that (i) such Debt and any other Debt incurred by the
               Issuer or its Subsidiaries since the first day of such
               four-quarter period and the application of the proceeds
               therefrom, including to refinance other Debt, had occurred at the
               beginning of such period, (ii) the repayment or retirement of any
               other Debt by the Issuer or its Subsidiaries since the first day
               of such four-quarter period had been incurred, repaid or retired
               at the beginning of such period (except that, in making such
               computation, the amount of Debt under any revolving credit
               facility shall be computed based upon the average daily balance
               of such Debt during such period), (iii) the income earned on any
               increase in Adjusted Total Assets since the end of such
               four-quarter period had been earned, on an annualized basis,
               during such period, and (iv) in the case of any acquisition or
               disposition by the Issuer or any Subsidiary of any asset or group
               of assets since the first day of such four-quarter period,
               including, without limitation, by merger, stock purchase or sale,
               or asset purchase or sale, such acquisition or disposition or any
               related repayment of Debt had occurred as of the first day of
               such period with the appropriate adjustments with respect to such
               acquisition or disposition being included in such pro forma
               calculation.

                      In addition to the foregoing limitations on the incurrence
               of Debt, the Issuer will not, and will not permit any Subsidiary
               to, incur any Debt secured by any mortgage, lien, charge, pledge,
               encumbrance or security interest of any kind upon any of the
               property of the Issuer or any Subsidiary ("Secured Debt"),
               whether owned at the date of the Indenture or thereafter
               acquired, if, immediately after giving effect to the incurrence
               of such additional Secured Debt, the aggregate principal amount
               of all outstanding Secured Debt is greater than 40% of Adjusted
               Total Assets.

                      For purposes of the foregoing provisions regarding the
               limitation on the incurrence of Debt, Debt shall be deemed to be
               "incurred" by the Issuer or a Subsidiary whenever the Issuer and
               its Subsidiary shall create, assume, guarantee or otherwise
               become liable in respect thereof.


                                       -5-

<PAGE>   6



                      Maintenance of Total Unencumbered Assets. The Issuer is
               required to maintain Total Unencumbered Assets of not less than
               165% of the aggregate outstanding principal amount of all
               outstanding Unsecured Debt.

                      As used herein:

                      "Annual Service Charge" as of any date means the amount
               which is expensed in any 12-month period for interest on Debt of
               the Issuer and its Subsidiaries.

                      "Consolidated Income Available For Debt Service" for any
               period means Consolidated Net Income plus amounts which have been
               deducted for (a) interest on Debt of the Issuer and its
               Subsidiaries, (b) provision for taxes of the Issuer and its
               Subsidiaries based on income, (c) amortization of Debt discount,
               (d) provisions for gains and losses on properties, (e)
               depreciation and amortization, (f) the effect of any noncash
               charge resulting from a change in accounting principles in
               determining Consolidated Net Income for such period and (g)
               amortization of deferred charges.

                      "Consolidated Net Income" for any period means the amount
               of consolidated net income (or loss) of the Issuer and its
               Subsidiaries for such period determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                      "Debt" of the Issuer or any Subsidiary means any
               indebtedness of the Issuer or such Subsidiary, as applicable,
               whether or not contingent, in respect of (i) borrowed money
               evidenced by bonds, notes, Notes or similar instruments, (ii)
               indebtedness secured by any mortgage, pledge, lien, charge,
               encumbrance or any security interest existing on property owned
               by the Issuer or such Subsidiary, (iii) the reimbursement
               obligations, contingent or otherwise, in connection with any
               letters of credit actually issued or amounts representing the
               balance that constitutes an accrued expense or trade payable or
               (iv) any lease of property by the Issuer or such Subsidiary as
               lessee which is reflected in the Issuer's consolidated balance
               sheet as a capitalized lease in accordance with generally
               accepted accounting principles, in the case of items of
               indebtedness under (i) through (iii) above to the extent that any
               such items (other than letters of credit) would appear as a
               liability on the Issuer's consolidated balance sheet in
               accordance with generally accepted accounting principles, and
               also includes, to the extent not otherwise included, any
               obligation by the Issuer or such Subsidiary to be liable for, or
               to pay, as obligor, guarantor or otherwise (other than for
               purposes of collection in the ordinary course of business),
               indebtedness of another person (other than the Issuer or any
               Subsidiary).


                                       -6-

<PAGE>   7

                      "Subsidiary" means a corporation, partnership or limited
               liability company, a majority of the outstanding voting stock,
               partnership interests or membership interests, as the case may
               be, of which is owned or controlled, directly or indirectly, by
               the Issuer or by one or more other Subsidiaries of the Issuer.
               For the purposes of this definition, "voting stock" means stock
               having the voting power for the election of directors, general
               partners, managers or trustees, as the case may be, whether at
               all times or only so long as no senior class of stock has such
               voting power by reason of any contingency.

                      "Total Assets" as of any date means the sum of (i)
               Undepreciated Real Estate Assets and (ii) all other assets of the
               Issuer and its Subsidiaries on a consolidated basis determined in
               accordance with generally accepted accounting principles (but
               excluding intangibles and accounts receivable).

                      "Total Unencumbered Assets" as of any date means the sum
               of (i) those Undepreciated Real Estate Assets which have not been
               pledged, mortgaged or otherwise encumbered by the owner thereof
               to secure Debt, excluding infrastructure assessment bonds, and
               (ii) all other assets of the Issuer and its Subsidiaries
               determined in accordance with generally accepted accounting
               principles (but excluding intangibles and accounts receivable)
               which have not been pledged, mortgaged or otherwise encumbered by
               the owner thereof to secure Debt.

                      "Undepreciated Real Estate Assets" as of any date means
               the cost (original cost plus capital improvements) of real estate
               assets of the Issuer and its Subsidiaries on such date, before
               depreciation and amortization, determined on a consolidated basis
               in accordance with generally accepted accounting principles.

                      "Unsecured Debt" as of any date means Debt which is not
               secured by any mortgage, lien, charge, pledge, encumbrance or
               security interest of any kind upon any of the properties of the
               Issuer or any Subsidiary.

                      (C) The Trustee shall not be obligated to monitor or 
        confirm, on a continuing basis or otherwise, the Issuer's compliance
        with the covenants contained in this subsection or with respect to
        reports or other documents filed under the Indenture; provided, however,
        that nothing herein shall relieve the Trustee of any obligations to
        monitor the Issuer's timely delivery of all reports and certificates
        required under Sections 703 and 1005 of the Indenture and to fulfill its
        obligations under Article Six of the Indenture.

               (15) The Notes shall be issuable only as Registered Securities in
        permanent global form (without coupons). Beneficial owners of interests
        in the permanent global Notes may exchange such interests for Notes of
        like tenor or any authorized form and

                                       -7-

<PAGE>   8

        denomination only in the manner provided in Section 305 of the
        Indenture. DTC shall be the depository with respect to the permanent
        global Note.

               (16) The Notes shall not be issuable as Bearer Securities.

               (17) Interest on any Note shall be payable only to the Person in
        whose name that Note (or one or more predecessor Notes thereof) is
        registered at the close of business on the Regular Record Date for such
        interest.

               (18) Sections 1402 and 1403 of the Indenture shall be applicable
        to the Notes.

               (19) The Notes shall not be issuable in definitive form except
        under the circumstances described in Section 305 of the Indenture.

               (20) Articles Sixteen and Seventeen of the Indenture shall not be
        applicable to the Notes.

               (21) The Issuer shall not pay Additional Amounts with respect to
        the Notes as contemplated by Section 1009 of the Indenture.

               (22) The Notes shall not be subordinated to any other debt of the
        Issuer, and shall constitute senior unsecured obligations of the Issuer.

        SECTION 102. FORM OF NOTE. The form of the Note is attached hereto as
Exhibit A.

                                   ARTICLE II

                                  MISCELLANEOUS

        SECTION 201. DEFINITIONS. Capitalized terms used but not defined in this
Eleventh Supplemental Indenture shall have the meanings ascribed thereto in the
Indenture.

        SECTION 202. CONFIRMATION OF INDENTURE. The Indenture, as heretofore
supplemented and amended by this Thirteenth Supplemental Indenture, is in all
respects ratified and confirmed, and the Indenture, this Thirteenth Supplemental
Indenture and all indentures supplemental thereto shall be read, taken and
construed as one and the same instrument.

        SECTION 203. CONCERNING THE TRUSTEE. The Trustee assumes no duties,
responsibilities or liabilities by reason of this Thirteenth Supplemental
Indenture other than as set forth in the Indenture and, in carrying out its
responsibilities hereunder, shall have all of the rights, protections and
immunities which it possesses under the Indenture.


                                       -8-

<PAGE>   9
        SECTION 204. GOVERNING LAW. This Thirteenth Supplemental Indenture, the
Indenture and the Securities shall be governed by and construed in accordanece
with the law of the State of New York.

        SECTION 205. SEPARABILITY. In case any provision in this Thirteenth
Supplemental Indenture shall for any reason be held to be invalid, illegal or
unenforceable, the validity, legality and enforceability of the remaining
provisions shall not in any way be affected or impaired thereby.

        SECTION 206. COUNTERPARTS. This Thirteenth Supplemental Indenture may be
executed in any number of counterparts each of which shall be an original, but
such counterparts shall together constitute but one and the same instrument.

                                       -9-

<PAGE>   10
 IN WITNESS WHEREOF, the parties hereto have caused this Thirteenth Supplemental
Indenture to be duly executed, and the corporate seal of the General Partner to
be hereunto affixed and attested, as of the day and year first above written.


                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as General Partner


                              By: /s/ Craig G. Vought
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein
   ----------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary


                              SPIEKER PROPERTIES, INC.


                              By: /s/ Craig G. Vought
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer
(seal)
Attest:

By: /s/ Stuart A. Rothstein
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Assistant Secretary



                                      -10-

<PAGE>   11


                              FIRST TRUST OF CALIFORNIA,
                                NATIONAL ASSOCIATION, as
                              Trustee



                              By: /s/ Jennifer Holder
                                  ----------------------------------------------
                                  Name: Jennifer Holder
                                  Title: Vice President
Attest:

By: /s/ Josephine Libunao
    ----------------------------
    Name: Josephine Libunao
    Title:  Assistant Vice President





                                      -11-

<PAGE>   12


STATE OF  California           )
COUNTY OF San Mateo            ) ss.:

        On the 2nd day of February, 1998, before me personally came Craig G.
Vought to me known, who, being by me duly sworn, did depose and say that he is
the EVP and CFO of Spieker Properties, Inc., one of the entities described in
and which executed the above instrument; that he knows the corporate seal of
said corporation; that the seal affixed to the said instrument is such corporate
seal; that it was so affixed by authority of the corporation, and that he signed
his name thereto by like authority.

                                            /s/  Melissa Trousdale            
                              --------------------------------------------------


   [Seal]



                                      -12-

<PAGE>   13

                                                                       EXHIBIT A


UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE
FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A
NOMINEE OF THE DEPOSITORY OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR
ANOTHER NOMINEE OF THE DEPOSITORY OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A
SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY. UNLESS THIS
CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST
COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS AGENT FOR
REGISTRATION OR TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE ISSUED IS
REGISTERED IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS REQUESTED BY AN
AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR SUCH
OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

REGISTERED                                                     PRINCIPAL AMOUNT
NO.: R-1                                                              $

CUSIP NO.:  848503 AK 4

                            SPIEKER PROPERTIES, L.P.
                          7% NOTE DUE FEBRUARY 1, 2007

        SPIEKER PROPERTIES, L.P., a California limited partnership (the
"Issuer"), for value received, hereby promises to pay to Cede & Co., or
registered assignee (the "Holder"), upon presentation, the principal sum of
$          on February 1, 2007, and to pay interest on the outstanding principal
amount thereon from February 2, 1998, or from the most recent Interest Payment
Date to which interest has been paid or duly provided for, semi-annually in
arrears on February 1 and August 1 in each year (each an "Interest Payment
Date"), commencing August 1, 1998, and at the Stated Maturity, at the rate of 7%
per annum, computed on the basis of a 360-day year comprised of twelve 30-day
months, until the entire principal amount hereof is paid or duly provided for.
The interest so payable, and punctually paid or duly provided for on any
Interest Payment Date will, as provided in the Indenture (hereinafter defined),
be paid to the person in whose name this Note (the "Note") (or one or more
predecessor Notes) is registered at the close of business on the Regular Record
Date for such Interest Payment Date which shall be the 15th calendar day
preceding the applicable Interest Payment Date. Any such interest not so
punctually paid or duly provided for shall forthwith cease to be payable to the
Holder on such Regular Record Date, and may either be paid to the Person in
whose name this Note (or one or more predecessor Notes) is registered at the
close of business on a Special Record Date for the payment of such Defaulted
Interest to be fixed by the Trustee, notice whereof shall be given to Holders of
Notes not more than 15 days and not less than 10 days prior to such Special
Record 

                                      -1-

<PAGE>   14
Date, or may be paid at any time in any other lawful manner not inconsistent
with the requirements of any securities exchange on which the Notes may be
listed, and upon such notice as may be required by such exchange, all as more
fully provided in the Indenture. Payments of the principal of, and interest on,
this Note will be made at the office or agency of the Trustee (hereinafter
defined) maintained for that purpose at 180 E. Fifth Street, St. Paul, Minnesota
55101, or elsewhere as provided in the Indenture, in United States Dollars;
provided, however, that at the option of the Holder hereof, and upon written
notice to the Trustee of not less than five Business Days prior to the
applicable Interest Payment Date, payment of interest may be made by (i) check
mailed to the address of the Person entitled thereto as such address shall
appear in the Security Register kept for the Notes pursuant to Section 305 of
the Indenture (the "Note Register") or (ii) transfer to an account of the Person
entitled thereto located inside the United States.

        This Note is one of a fully authorized issue of securities of the Issuer
issued as a series of securities issued and to be issued under an Indenture,
dated as of December 6, 1995 as supplemented by the Thirteenth Supplemental
Indenture dated February 2, 1998 (collectively, the "Indenture"), among the
Issuer and First Trust of California, National Association (the "Trustee," which
term includes any successor trustee under the Indenture with respect to the
Notes), to which Indenture and all indentures supplemental thereto reference is
hereby made for a statement of the respective rights, limitations of rights,
duties and immunities thereunder of the Issuer, the Trustee and the Holders of
the Notes, and of the terms upon which the Notes are, and are to be,
authenticated and delivered. This Note is one of the series designated as the
"7% Notes due February 1, 2007" limited in the aggregate principal amount to
$1,500,000.

        The Notes may be redeemed at any time at the option of the Issuer, in
whole or from time to time in part, at a redemption price (the "Redemption
Price") equal to the sum of (i) the principal amount of the Notes (or portion
thereof) being redeemed plus accrued interest thereon to the redemption date and
(ii) the Make-Whole Amount (as defined below), if any, with respect to such
Notes (or portion thereof).

        If notice has been given as provided in the Indenture and funds for the
redemption of any Notes (or any portion thereof) called for redemption shall
have been made available on the redemption date referred to in such notice, such
Notes (or any portion thereof) will cease to bear interest on the date fixed for
such redemption specified in such notice and the only right of the Holders of
the Notes will be to receive payment of the Redemption Price, with respect to
such Notes or portion thereof so redeemed.

        Notice of any optional redemption of any Notes (or any portion thereof)
will be given to Holders at their addresses, as shown in the Note Register, not
more than 60 nor less than 30 days prior to the date fixed for redemption. The
notice of redemption will specify, among other items, the Redemption Price and
the principal amount of the Notes held by such Holder to be redeemed.

        The Issuer will notify the Trustee at least 45 days prior to giving
notice of redemption (or such shorter period as is satisfactory to the Trustee)
of the aggregate principal amount of Notes to be redeemed and their redemption
date. If less than all the Notes are to be redeemed at the option

                                       -2-

<PAGE>   15

of the Issuer, the Trustee shall select, in such manner as it shall deem fair
and appropriate, the Notes to be redeemed in whole or in part.

In the event of redemption of the Notes in part only, a new Note for the amount
of the unredeemed portion hereof shall be issued in the name of the Holder
hereto, upon cancellation hereof.

        As used herein:

               "Make-Whole Amount" means, in connection with any optional
        redemption or accelerated payment of any Notes, the excess, if any, of
        (i) the aggregate present value as of the date of such redemption or
        accelerated payment of each dollar of principal being redeemed or paid
        and the amount of interest (exclusive of interest accrued to the date of
        redemption or accelerated payment) that would have been payable in
        respect of each such dollar if such redemption or accelerated payment
        had not been made, determined by discounting, on a semi-annual basis,
        such principal and interest at the Reinvestment Rate (determined on the
        third Business Day preceding the date such notice of redemption is given
        or declaration of acceleration is made) from the respective dates on
        which such principal and interest would have been payable if such
        redemption or accelerated payment had not been made, over (ii) the
        aggregate principal amount of the Notes being redeemed or paid.

               "Reinvestment Rate" means 0.25% plus the arithmetic mean of the
        yields under the respective heading "Week Ending" published in the most
        recent Statistical Release under the caption "Treasury Constant
        Maturities" for the maturity (rounded to the nearest month)
        corresponding to the remaining life to maturity, as of the payment date
        of the principal being redeemed or paid. If no maturity exactly
        corresponds to such maturity, yields for the two published maturities
        most closely corresponding to such maturity shall be calculated pursuant
        to the immediately preceding sentence and the Reinvestment Rate shall be
        interpolated or extrapolated from such yields on a straight-line basis,
        rounding in each of such relevant periods to the nearest month. For the
        purpose of calculating the Reinvestment Rate, the most recent
        Statistical Release published prior to the date of determination of the
        Make-Whole Amount shall be used.

               "Statistical Release" means the statistical release designated
        "H.15(519)" or any successor publication which is published weekly by
        the Federal Reserve System and which establishes yields on actively
        traded United States government securities adjusted to constant
        maturities, or, if such statistical release is not published at the time
        of any determination under the Indenture, then such other reasonably
        comparable index which shall be designated by the Issuer.

        The Indenture contains provisions for defeasance at any time of (a) the
entire indebtedness of the Issuer on this Note and (b) certain restrictive
covenants and the related

                                       -3-

<PAGE>   16



defaults and Events of Default applicable to the Issuer, in each case, upon
compliance by the Issuer with certain conditions set forth in the Indenture,
which provisions apply to this Note.

        The Issuer is subject to certain covenants contained in the Indenture
with respect to, and for the benefit of the Holders of, the Notes. The Trustee
shall not be obligated to monitor or confirm, on a continuing basis or
otherwise, the Issuer's compliance with the covenants contained in the Indenture
or with respect to reports or other certificates filed under the Indenture;
provided, however, that nothing herein shall relieve the Trustee of any
obligations to monitor the Issuer's timely delivery of all reports and
certificates required under Sections 703 and 1005 of the Indenture and to
fulfill its obligations under Article Six of the Indenture. If an Event of
Default as defined in the Indenture with respect to the Notes shall occur and be
continuing, the principal of the Notes may be declared due and payable in the
manner and with the effect provided in the Indenture.

        As provided in and subject to the provisions of the Indenture, the
Holder of this Note shall not have the right to institute any proceeding with
respect to the Indenture or for the appointment of a receiver or trustee or for
any other remedy thereunder, unless such Holder shall have previously given the
Trustee written notice of a continuing Event of Default with respect to the
Notes, the Holders of not less than a majority in principal amount of the Notes
at the time Outstanding shall have made written request to the Trustee to
institute proceedings in respect of such Event of Default as Trustee and offered
the Trustee reasonable indemnity and shall have failed to institute any such
proceeding, for 60 days after receipt of such notice, request and offer of
indemnity and the Trustee shall not have received from the Holders of a majority
in principal amount of the Notes at the time Outstanding a direction
inconsistent with such request. The foregoing shall not apply to any suit
instituted by the Holder of this Note for the enforcement of any payment of
principal hereof or any interest on or after the respective due dates expressed
herein.

        The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Issuer and the rights of the Holders of the Notes under the Indenture at any
time by the Issuer and the Trustee with the consent of the Holders of not less
than a majority in principal amount of the Outstanding Notes. The Indenture also
contains provisions permitting the Holders of not less than a majority in
principal amount of the Notes at the time Outstanding, on behalf of the Holders
of all Notes, to waive compliance by the Issuer with certain provisions of the
Indenture and certain past defaults under the Indenture and their consequences.
Any such consent or waiver by the Holder of this Note shall be conclusive and
binding upon such Holder and upon all future Holders of this Note and of any
Note issued upon the registration of transfer hereof or in exchange herefor or
in lieu hereof, whether or not notation of such consent or waiver is made upon
this Note.

        No reference herein to the Indenture and no provision of this Note or of
the Indenture shall alter or impair the obligation of the Issuer, which is
absolute and unconditional, to pay the principal of, and interest on, this Note
at the times, place and rate, and in the coin or currency, herein prescribed.

                                       -4-

<PAGE>   17

        As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Note is registrable in the Note Register, upon
surrender of this Note for registration of transfer at the office or agency of
the Issuer in any Place of Payment where the principal of, and interest on, this
Note are payable, duly endorsed by, or accompanied by a written instrument of
transfer in form satisfactory to the Issuer and the Security Registrar for the
Notes duly executed by, the Holder hereof or his attorney duly authorized
denominations and for the same aggregate principal amount, will be issued to the
designated transferee or transferees.

        The Notes of this series are issuable only in registered form without
coupons in denominations of $1,000 and any integral multiple thereof. As
provided in the Indenture and subject to certain limitations therein set forth,
the Notes are exchangeable for a like aggregate principal amount of Notes of
this series of a different authorized denomination, as requested by the Holder
surrendering the same.

        No service charge shall be made for any such registration of transfer or
exchange, but the Issuer may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

        Prior to due presentment of this Note for registration of transfer, the
Issuer, the Trustee and any agent of the Issuer or the Trustee may treat the
Person in whose name this Note is registered as the owner hereof for all
purposes, whether or not this Note be overdue, and neither the Issuer, the
Trustee nor any such agent shall be affected by notice to the contrary.

        All terms used in this Note which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

        THE INDENTURE AND THE NOTES INCLUDING THIS NOTE SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAW OF THE STATE
OF NEW YORK.

        Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures, the Issuer has caused "CUSIP" numbers to be
printed on the Notes as a convenience to the Holders of the Notes. No
representation is made as to the correctness or accuracy of such CUSIP numbers
as printed on the Notes, and reliance may be placed only on the other
identification numbers printed hereon.

        Unless the certificate of authentication hereon has been executed by or
on behalf of the Trustee by manual signature, this Note shall not be entitled to
any benefit under the Indenture or be valid or obligatory for any purposes.


                                       -5-

<PAGE>   18


        IN WITNESS WHEREOF, the Issuer has caused this instrument to be duly
executed under its corporate seal this __ day of February, 1998.

                              SPIEKER PROPERTIES, L.P.

                              By: Spieker Properties, Inc., as 
                                    General Partner


                              By: 
                                  ----------------------------------------------
                                   Name: Craig G. Vought
                                         Executive Vice President
                                           and Chief Financial Officer

(SEAL)

Attest:


By: 
    ----------------------------
    Name:  Stuart A. Rothstein
    Title: Vice President - Finance
             and Assistant Secretary



                                       -6-

<PAGE>   19


                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION


        This is one of the Notes of the series designated "7% Notes Due
February 1, 2007" referred to in the within-mentioned Indenture.


FIRST TRUST OF CALIFORNIA,
NATIONAL ASSOCIATION,
as Trustee


By:
    ----------------------------
      Name:
      Title:


                                       -7-

<PAGE>   20

                                 ASSIGNMENT FORM


                   FOR VALUE RECEIVED, the undersigned hereby
                         sells, assigns and transfers to




  -----------------------------------------------------------------------------
     (Insert Social Security number or other identifying number of assignee)

  -----------------------------------------------------------------------------
  (Please print or typewrite name and address, including zip, code of assignee)


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


the within Note of Spieker Properties, L.P. and hereby does irrevocably
constitute and appoint

- -----------------------------------------------------------------------------
Attorney to transfer said Note on the books of the within-named Issuer with full
power of substitution in the premises.

Dated:
      ------------                  -----------------------------------

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


Signature(s) must be guaranteed by an eligible Guarantor Institution (banks,
stock brokers, savings and loan associations and credit unions) with membership
in an approved signature guarantee medallion program pursuant to Securities and
Exchange Commission Rule 17Ad-15.

NOTICE: The signature to this assignment must correspond with the name as it
appears on the first page of the within Note in every particular, without
alteration or enlargement or any change whatever.

                                       -8-



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