PUBLIC STORAGE INC /CA
SC 13D/A, 1997-08-29
REAL ESTATE INVESTMENT TRUSTS
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<PAGE>
 
                            UNITED STATES
                  SECURITIES AND EXCHANGE COMMISSION
                        Washington, D.C. 20549

                             SCHEDULE 13D

              Under the Securities Exchange Act of 1934
                          (Amendment No. 4 )*

                  Public Storage Properties XI, Inc.
                           (Name of Issuer)

                         Common Stock Series A
                    (Title of Class of Securities)

                             744609 10 8
                            (CUSIP Number)

       David Goldberg, 701 Western Avenue, Suite 200, Glendale,
             California 91201-2397, 818/244-8080, ext. 529
      ---------------------------------------------------------
            (Name, Address and Telephone Number of Person
          Authorized to Receive Notices and Communications)

                            August 18, 1997
       (Date of Event which Requires Filing of this Statement)

   If the filing person has previously filed a statement on
   Schedule 13G to report the acquisition which is the subject of
   this Schedule 13D, and is filing this schedule because of Rule
   13d-1(b)(3) or (4), check the following box [   ].

   Check the following box if a fee is being paid with the
   statement [   ].  (A fee is not required only if the reporting
   person: (1) has a previous statement on file reporting
   beneficial ownership of more than five percent of the class of
   securities described in Item 1; and (2) has filed no amendment
   subsequent thereto reporting beneficial ownership of five
   percent or less of such class.)  (See Rule 13d-7.)

   NOTE:  Six copies of this statement, including all exhibits,
   should be filed with the Commission.  See Rule 13d-1(a) for
   other parties to whom copies are to be sent.

   *The remainder of this cover page shall be filled out for a
   reporting person's initial filing on this form with respect to
   the subject class of securities, and for any subsequent
   amendment containing information which would alter disclosures
   provided in a prior cover page.

   The information required on the remainder of this cover page
   shall not be deemed to be "filed" for the purpose of Section 18
   of the Securities Exchange Act of 1934 ("Act") or otherwise
   subject to the liabilities of that section of the Act but shall
   be subject to all other provisions of the Act (however, see the
   Notes).
<PAGE>
 
                             SCHEDULE 13D

   CUSIP No. 744609 10 8

   1    Name of Reporting Person
        S.S. or I.R.S. Identification No. of Above Person

             Public Storage, Inc.

   2    Check the Appropriate Box if a Member of a Group*
                                          a. [ ]
                                          b. [ ]

   3    SEC Use Only

   4    Source of Funds*
             WC

   5    Check Box if Disclosure of Legal Proceedings is Required
        Pursuant to Items 2(d) or 2(e)    [  ]

   6    Citizenship or Place of Organization
             California

   NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON
   WITH
                  7    Sole Voting Power
                       223,712

                  8    Shared Voting Power
                       N/A

                  9    Sole Dispositive Power
                       223,288

                  10   Shared Dispositive Power
                       N/A

   11   Aggregate Amount Beneficially Owned by Each Reporting
        Person
             223,712

   12   Check Box if the Aggregate Amount in Row (11) Excludes
        Certain Shares*                   [  ]

   13   Percent of Class Represented by Amount in Row (11)
             12.29%

   14   Type of Reporting Person*
             CO

                                       2
<PAGE>
 
             The Statement on Schedule 13D dated November 16, 1995, as
   amended and restated by Amendment No. 1 dated January 12, 1996 and
   Amendment No. 2 dated April 16, 1996 and amended by Amendment No. 3 dated
   June 17, 1996 (the "Schedule 13D") filed by Public Storage, Inc. (the
   "Reporting Person"), relating to the Common Stock Series A, par value $.01
   per share (the "Common Stock Series A" or the "Series A Shares"), of Public
   Storage Properties XI, Inc., a California corporation (the "Issuer"), is
   amended by this Amendment No. 4 as set forth below. Defined terms that are
   not defined herein have the meanings assigned to those terms in the Schedule
   13D.

   Item 3.   Source and Amount of Funds or Other Consideration

             The 82,100 Series A Shares acquired by the Reporting Person
   (as of August 18, 1997) other than in the merger of Public Storage
   Management, Inc. into the Reporting Person were purchased for an aggregate
   cost (including commissions and fees) of approximately $1,467,661, with funds
   obtained from the Reporting Person's working capital.

   Item 4.   Purpose of Transaction
             
             The Issuer, American Office Park Properties, Inc. ("AOPP") and the
   Reporting Person have entered into an Agreement and Plan of Reorganization
   dated as of August 18, 1997 (the "Merger Agreement") providing for (i) the
   merger of AOPP with and into the Issuer and (ii) the tax-deferred like-kind
   exchange in which the Issuer will exchange 13 predominantly mini-warehouse
   properties for 11 commercial properties owned by the Reporting Person, which
   merger and exchange are subject to certain conditions (as described below).
   AOPP, a subsidiary of the Reporting Person, owns and operates commercial
   properties directly and through a consolidated partnership. Upon the merger
   of AOPP into the Issuer, each of the 1,819,937 outstanding Series A Shares
   (other than shares held by holders of Series A Shares of the Issuer ("Series
   A Shareholders") who have properly exercised dissenters' rights under
   California law) would continue to be owned by the Series A Shareholders or
   converted into the right to receive cash as follows: (i) with respect to up
   to 20% of the outstanding Series A Shares, $20.50 in cash and (ii) the
   balance of the outstanding Series A Shares would continue to be owned by the
   Series A Shareholders. In the merger, (i) each share of the Issuer's Common
   Stock Series B ("Series B Shares") and each share of the Issuer's Common
   Stock Series C ("Series C Shares") would be converted into 0.8641 Series A
   Shares of the Issuer (or up to 20% in cash) and (ii) each share of AOPP's
   capital stock will be converted into 1.18 Series A Shares of the Issuer (or
   up to 20% in cash). There are 707,071 outstanding Series B Shares and Series
   C Shares and 3,523,500 outstanding shares of AOPP Common Stock. Approximately
   4,727,000 Series A Shares of the Issuer would be issued in the merger
   (assuming no cash elections) with an additional 7,192,000 shares reserved for
   issuance upon conversion of partnership interests of AOPP's consolidated
   partnership into Series A Shares of the Issuer. After the merger, the
   ownership of the Issuer by public shareholders will be reduced from 63% to
   26% while the beneficial ownership of the Issuer by the Reporting Person will
   increase from 37% (which includes the Reporting Person's combined beneficial
   ownership of Series A Shares, Series B Shares and Series C Shares) to 74%
   (assuming no cash election and no conversion of partnership interests).
   Concurrently with the merger, the Issuer will exchange 13 predominantly mini-
   warehouse properties for 11 commercial properties owned by the Reporting
   Person. The merger and the exchange are conditioned on each other. The merger
   is conditioned on (among other things) approval by the Issuer's shareholders
   and receipt of a satisfactory fairness opinion by the Issuer and the exchange
   is conditioned on (among other things) approval by the Reporting Person's
   Board of Directors. The Reporting Person believes that the conditions to the
   merger and the exchange will be satisfied, although there can be no 
   assurance.

             For further information regarding the merger and the exchange, see 
the Merger Agreement which is filed as Exhibit 4 hereto and is incorporated 
herein by this reference.

                                       3
<PAGE>
 
   Item 5.   Interest in Securities of the Issuer

             As of August 18, 1997, the Reporting Person beneficially owned
   223,712 Series A Shares, representing approximately 12.29% of the 1,819,937
   Series A Shares outstanding. The Reporting Person has the sole power to vote
   all of these shares, has the sole power to dispose of 223,288 of these
   shares, and has no power to dispose of 424 of these shares.

   Item 7.   Material to be Filed as Exhibits

             (Exhibits 1 through 3 are listed in the Schedule 13D)

             Exhibit 4 - Agreement and Plan of Reorganization dated as of
   August 18, 1997 by and among the Issuer, AOPP and the Reporting Person.
   Filed herewith; exhibits to the Agreement and Plan of Reorganization (except
   Exhibit A, Agreement of Merger, which is filed herewith) have been omitted
   and will be furnished to the Securities and Exchange Commission upon request.


                                       4
<PAGE>
 
                                      SIGNATURE


        After reasonable inquiry and to the best of its knowledge and
   belief, the undersigned certifies that the information set forth in
   this statement is true, complete and correct.

   Dated:  August 29, 1997             PUBLIC STORAGE, INC.


                                       By:  /s/ SARAH HASS
                                           -------------------------
                                           Sarah Hass
                                           Vice President

                                       5

<PAGE>
 
                                                                    EXHIBIT 99.4

                      AGREEMENT AND PLAN OF REORGANIZATION



     THIS AGREEMENT AND PLAN OF REORGANIZATION ("Agreement") is entered into as
of this 18th day of August, 1997, by and among PUBLIC STORAGE PROPERTIES XI,
INC., a California corporation ("PSP11"), AMERICAN OFFICE PARK PROPERTIES, INC.,
a California corporation ("AOPP") and PUBLIC STORAGE, INC., a California
corporation ("PSI").

     A.  The parties intend that this Agreement shall constitute a Plan of
Reorganization for purposes of Section 368(a)(1)(A) of the Internal Revenue Code
of 1986, as amended (the "Code").  The Plan of Reorganization provides for (i)
the merger of AOPP with and into PSP11 in accordance with the applicable
provisions of the General Corporation Law of California (the "GCLC") and an
Agreement of Merger substantially in the form attached hereto as Exhibit A
("Merger Agreement") and (ii) the tax-deferred like-kind exchange (the
"Exchange") in which PSP11 will transfer to PSI the 13 properties listed on
Exhibit B hereto (the "PSP11 Exchange Properties") and PSI will transfer to
PSP11 the 11 properties listed on Exhibit C hereto (the "PSI Exchange
Properties").

     B.  PSP11, AOPP and PSI believe that it is in the best interests of such
corporations and their respective shareholders to enter into and complete this
Agreement and they have approved this Agreement and the transactions
contemplated hereby.

     NOW, THEREFORE, the parties agree as follows:

     1.  Adoption of Plan.  The parties hereby adopt the Plan of Reorganization
hereinafter set forth.

     2.  The Merger and the Exchange.

         2.1   Completion of the Merger and the Exchange.  At the Effective Time
(as defined below), (i) AOPP will be merged with and into PSP11 (the "Merger")
in accordance with the terms, conditions and provisions of this Agreement and
the Merger Agreement and (ii) the Exchange will be consummated in accordance
with the terms, conditions and provisions of this Agreement.  The Merger shall
become effective at the time at which the Merger Agreement, together with the
requisite Officers' Certificates of PSP11 and AOPP, are filed with the
California Secretary of State in accordance with the GCLC (the "Effective
Time").  PSP11 and AOPP are sometimes collectively referred to herein as the
"Constituent Corporations" and PSP11, as the surviving corporation of the
Merger, is sometimes referred to herein as the "Surviving Corporation."

         2.2   Effect of the Merger and Exchange.  At the Effective Time:

               2.2.1   Constituent Corporations. The separate corporate
existence of AOPP shall cease and the Surviving Corporation shall thereupon
succeed, without other transfer, to all the rights and property of AOPP and
shall be subject to all the debts and liabilities of AOPP in the same manner as
if the Surviving Corporation had itself incurred them; all rights of creditors
and all liens upon the property of each of the Constituent Corporations shall be
preserved unimpaired, provided that such liens upon property of AOPP shall be
limited to the property affected thereby immediately prior to the Effective
Time; and any action or proceeding pending by or against AOPP may be prosecuted
to judgment, which shall bind the Surviving Corporation, or the Surviving
Corporation may be proceeded against or substituted in its place.

               2.2.2   Articles and Bylaws.  Except as amended by the Merger
Agreement, the Articles of Incorporation and the Bylaws of PSP11, as in effect
at the Effective Time, shall continue to be the Articles of Incorporation and
the Bylaws of the Surviving Corporation until changed as provided by law and
their respective provisions; provided that such Articles of Incorporation and
Bylaws may be amended and restated following
<PAGE>
 
the Effective Time in forms reasonably acceptable to the Surviving Corporation.

          2.2.3      Directors.  The directors of the Surviving Corporation
immediately following the Merger shall be the following:

                     Ronald L. Havner, Jr.
                     Harvey Lenkin
                     Vern O. Curtis
                     James Kropp
                     Jack D. Steele
                     Christopher Weil

                     Such persons shall continue as directors of the Surviving
Corporation until their successors are elected and qualified as provided by law
and in accordance with the Articles of Incorporation and Bylaws of the Surviving
Corporation. If any of the above named individuals is unable to serve as a
director of the Surviving Corporation at the Effective Time, a successor will be
selected by the remaining above named individuals.

          2.2.4      Officers.  The executive officers of the Surviving
Corporation immediately following the Merger shall be the following:

                     Ronald L. Havner, Jr.
                     Mary Jayne Howard

                     Such persons shall continue as officers of the Surviving
Corporation until their successors are elected and qualified as provided by law
and in accordance with the Articles of Incorporation and Bylaws of the Surviving
Corporation.

          2.2.5      Name.  At the Effective Time, the name of the Surviving
Corporation shall be changed to "American Office Properties, Inc."

    2.3   Common Stock Series A of PSP11.  Each outstanding share of Common
Stock Series A ($.01 par value) of PSP11 (the "PSP11 Shares") would continue to
be owned by holders of PSP11 Shares or converted into the right to receive cash
as follows:

          2.3.1      Cash Election.  At the Effective Time, subject to Section
2.7.1 hereof, each PSP11 Share as to which a cash election has been made in
accordance with the provisions of Section 2.6 hereof and has not been revoked,
relinquished or lost pursuant to Section 2.6 hereof (the "Cash Election Shares")
shall be converted into and shall represent the right to receive $20.50 in cash.
As soon as practicable after the Effective Time, the registered holders of Cash
Election Shares shall be paid the cash to which they are entitled hereunder in
respect of such Cash Election Shares.

          2.3.2      No Cash Election.  At the Effective Time, subject to
Section 2.12 hereof, each PSP11 Share (other than Cash Election Shares) shall
continue to be owned by the holders of the PSP11 Shares.

    2.4   Common Stock Series B and C of PSP11.  Each outstanding share of
Common Stock Series B and C ($.01 par value) of PSP11 (the "PSP11 Series B and C
Shares") would be converted into the right to receive cash or PSP11 Shares as
follows:

          2.4.1      Cash Election.  At the Effective Time, subject to Section
2.7.2 hereof, each PSP11 Series B and C Share as to which a cash election has
been made in accordance with the provisions of Section 2.6 hereof and has not
been revoked, relinquished or lost pursuant to Section 2.6 hereof (the "Cash
Election Shares") shall be converted into and shall represent the right to
receive $17.71 in cash.  As soon as practicable after the Effective Time, the
registered holders of Cash

                                       2
<PAGE>
 
Election Shares shall be paid the cash to which they are entitled hereunder in
respect of such Cash Election Shares.

          2.4.2      No Cash Election.  At the Effective Time, subject to
Section 2.12 hereof, each PSP11 Series B and C Share (other than Cash Election
Shares) shall be converted into 0.8641 PSP11 Shares.  If PSP11 should split or
combine the PSP11 Shares, or pay a stock dividend, such conversion number will
be appropriately adjusted to reflect such action.

    2.5   AOPP Shares. Each outstanding share of Common Stock ($.10 par value)
of AOPP (the "AOPP Shares") would be converted into the right to receive cash or
PSP11 Shares as follows:

          2.5.1      Cash Election.  At the Effective Time, subject to Section
2.7.3 hereof, each AOPP Share as to which a cash election has been made in
accordance with the provisions of Section 2.6 hereof and has not been revoked,
relinquished or lost pursuant to Section 2.6 hereof (the "Cash Election Shares")
shall be converted into and shall represent the right to receive $24.19 in cash.
As soon as practicable after the Effective Time, the registered holders of Cash
Election Shares shall be paid the cash to which they are entitled hereunder in
respect of such Cash Election Shares.

          2.5.2      No Cash Election.  At the Effective Time, subject to
Section 2.12 hereof, each AOPP Share (other than Cash Election Shares) shall be
converted into 1.18 PSP11 Shares.  If PSP11 should split or combine the PSP11
Shares, or pay a stock dividend, such conversion number will be appropriately
adjusted to reflect such number.

    2.6   Procedure for Cash Election.  At the time of the mailing of the
Proxy Statement and Prospectus provided for in Section 7.5 hereof, PSP11 will
send to (i) each holder of record of PSP11 Shares and PSP11 Series B and C
Shares at the record date for the PSP11 meeting of shareholders referred to in
Section 7.2.1 hereof and (ii) each holder of record of AOPP Shares at the record
date for the AOPP meeting of shareholders referred to in Section 7.2.2 hereof a
cash election form (the "Form of Election") providing such holder with the
option to elect to receive the cash election payment contemplated by Section
2.3.1, 2.4.1 or 2.5.1 hereof with respect to such holder's shares.  Any such
election to receive such cash payment shall have been properly made only if
American Stock Transfer & Trust Company (the "Exchange Agent") shall have
received at its designated office, by 5:00 p.m., New York time, on the last
business day preceding the day of such meeting of shareholders, a Form of
Election properly completed and accompanied by certificates for the shares to
which such Form of Election relates (or an appropriate guarantee of delivery in
a form and on terms satisfactory to PSP11), as set forth in such Form of
Election.  Any Form of Election may be revoked by the person submitting the same
to the Exchange Agent only by written notice received by the Exchange Agent
prior to 5:00 p.m., New York time, on the last business day before the day of
the respective meeting of shareholders referred to in Section 7.2.1 or 7.2.2
hereof.  In addition, all Forms of Election shall automatically be revoked if
the Exchange Agent is notified in writing by the parties hereto that the Merger
has been abandoned.  If a Form of Election is revoked pursuant to this Section
2.6, the certificate or certificates or any guarantee of delivery in respect of
the PSP11 Shares, PSP11 Series B and C Shares or AOPP Shares to which such Form
of Election relates shall be promptly returned to the person submitting the same
to the Exchange Agent.  The Exchange Agent may determine whether or not
elections to receive cash have been properly made or revoked pursuant to this
Section 2.6, and any such determination shall be conclusive and binding.  If the
Exchange Agent determines that any election to receive cash was not properly or
timely made, the PSP11 Shares, PSP11 Series B and C Shares and AOPP Shares
covered thereby shall not be treated as Cash Election Shares, and shall be
treated in the Merger as provided in Section 2.3.2, 2.4.2 or 2.5.2 hereof.  The
Exchange Agent may, with the mutual agreement of PSP11 and AOPP, establish such
procedures, not inconsistent with this Section 2.6, as may be necessary or
desirable to implement this Section 2.6.

                                       3
<PAGE>
 
         2.7  Procedure for Proration.

              2.7.1  PSP11 Shares.

                     2.7.1.1   No Proration.  If the aggregate number of Cash
Election Shares owned by holders of PSP11 Shares is 20% or less than the number
of PSP11 Shares outstanding as of the record date for the meeting of
shareholders of PSP11 referred to in Section 7.2.1, then each such Cash Election
Share shall be converted in the Merger into the right to receive $20.50 in cash.

                     2.7.1.2   Proration.  If the aggregate number of Cash
Election Shares owned by holders of PSP11 Shares exceeds 20%, then each such
Cash Election Share shall be converted in the Merger into the right to receive
cash as follows:  the number of Cash Election Shares owned by a holder of PSP11
Shares that shall be converted into the right to receive $20.50 in cash shall
equal the number obtained by multiplying (i) 20% of the outstanding PSP11 Shares
by (ii) a fraction of which the numerator shall be the number of Cash Election
Shares owned by such holder and the denominator shall be the aggregate number of
Cash Election Shares owned by holders of PSP11 Shares.  The balance of such Cash
Election Shares shall be treated in accordance with the provisions of Section
2.3.2 hereof.  Notwithstanding the foregoing, PSP11, in its sole discretion, may
allow such Cash Election Shares to receive $20.50 in cash even if the aggregate
number of Cash Election Shares owned by holders of PSP11 Shares exceeds 20% of
the number of PSP11 Shares outstanding as of the record date for the meeting of
shareholders of PSP11 referred to in Section 7.2.1.

             2.7.2   PSP11 Series B and C Shares.

                     2.7.2.1    No Proration.  If the aggregate number of Cash
Election Shares owned by holders of PSP11 Series B and C Shares is 20% or less
than the number of PSP11 Series B and C Shares outstanding as of the record date
for the meeting of shareholders of PSP11 referred to in Section 7.2.1, then each
such Cash Election Share shall be converted in the Merger into the right to
receive $17.71 in cash.

                     2.7.2.2    Proration.  If the aggregate number of Cash
Election Shares owned by holders of PSP11 Series B and C Shares exceeds 20%,
then each such Cash Election Share shall be converted in the Merger into the
right to receive cash as follows:  the number of Cash Election Shares owned by a
holder of PSP11 Series B and C Shares that shall be converted into the right to
receive $17.71 in cash shall equal the number obtained by multiplying (i) 20% of
the outstanding PSP11 Series B and C Shares by (ii) a fraction of which the
numerator shall be the number of Cash Election Shares owned by such holder and
the denominator shall be the aggregate number of Cash Election Shares owned by
holders of PSP11 Series B and C Shares.  The balance of such Cash Election
Shares shall be treated in accordance with the provisions of Section 2.4.2
hereof.  Notwithstanding the foregoing, PSP11, in its sole discretion, may allow
such Cash Election Shares to receive $17.71 in cash even if the aggregate number
of Cash Election Shares owned by holders of PSP11 Series B and C Shares exceeds
20% of the number of PSP11 Shares outstanding as of the record date for the
meeting of shareholders of PSP11 referred to in Section 7.2.1.

             2.7.3   AOPP Shares.

                     2.7.3.1   No Proration.  If the aggregate number of Cash
Election Shares owned by holders of AOPP Shares is 20% or less than the number
of AOPP Shares outstanding as of the record date for the meeting of shareholders
of AOPP referred to in Section 7.2.2, then each such Cash Election Share shall
be converted in the Merger into the right to receive $24.19 in cash.

                     2.7.3.2   Proration.  If the aggregate number of Cash
Election Shares owned by holders of AOPP Shares exceeds 20%, then each

                                       4
<PAGE>
 
such Cash Election Share shall be converted in the Merger into the right to
receive cash as follows:  the number of Cash Election Shares owned by a holder
of AOPP Shares that shall be converted into the right to receive $24.19 in cash
shall equal the number obtained by multiplying (i) 20% of the outstanding AOPP
Shares by (ii) a fraction of which the numerator shall be the number of Cash
Election Shares owned by such holder and the denominator shall be the aggregate
number of Cash Election Shares owned by holders of AOPP Shares.  The balance of
such Cash Election Shares shall be treated in accordance with the provisions of
Section 2.5.2 hereof.  Notwithstanding the foregoing, PSP11, in its sole
discretion, may allow such Cash Election Shares to receive $24.19 in cash even
if the aggregate number of Cash Election Shares owned by holders of AOPP Shares
exceeds 20% of the number of AOPP Shares outstanding as of the record date for
the meeting of shareholders of AOPP referred to in Section 7.2.2.

         2.8   Exchange of Certificates.  After the Effective Time, each holder
of a certificate theretofore evidencing outstanding PSP11 Series B and C Shares
and AOPP Shares which were converted into PSP11 Shares pursuant hereto, upon
surrender of such certificate to the Exchange Agent or such other agent or
agents as shall be appointed by the Surviving Corporation, shall be entitled to
receive a certificate representing the number of whole PSP11 Shares into which
the PSP11 Shares theretofore represented by the certificate so surrendered shall
have been converted as provided in Section 2.3.2 hereof and cash payment in lieu
of fractional share interests, if any, as provided in Section 2.11 hereof.  As
soon as practicable after the Effective Time, the Exchange Agent will send a
notice and a transmittal form to each holder of record at the Effective Time of
PSP11 Series B and C Shares and AOPP Shares whose stock shall have been
converted into PSP11 Shares, advising such holder of the effectiveness of the
Merger and the procedure for surrendering to the Exchange Agent certificates
evidencing PSP11 Series B and C Shares and AOPP Shares in exchange for
certificates evidencing PSP11 Shares.

         2.9   Status Until Surrendered.  Until surrendered as provided in
Section 2.8 hereof, each outstanding certificate which, prior to the Effective
Time, represented PSP11 Series B and C Shares and AOPP Shares (other than
Dissenting Shares (as defined below), if any) will be deemed for all corporate
purposes to evidence ownership of the number of whole PSP11 Shares into which
the PSP11 Series B and C Shares and AOPP Shares evidenced thereby were
converted.  However, until such outstanding certificates formerly evidencing
PSP11 Series B and C Shares and AOPP Shares are so surrendered, no dividend
payable to holders of record of PSP11 Shares shall be paid to the holders of
such outstanding certificates in respect of PSP11 Series B and C Shares and AOPP
Shares, but upon surrender of such certificates by such holders there shall be
paid to such holders the amount of any dividends (without interest) theretofore
paid with respect to such whole PSP11 Shares as of any record date on or
subsequent to the Effective Time and the amount of any cash (without interest)
payable to such holder in lieu of fractional share interests pursuant to Section
2.11 hereof.

         2.10  Transfer of Shares.  After the Effective Time, there shall be no
further registration of transfers of PSP11 Series B and C Shares or AOPP Shares
on the respective corporate records and, if certificates formerly evidencing
such shares are presented to the Surviving Corporation, they shall be cancelled
and exchanged for certificates evidencing PSP11 Shares and cash in lieu of
fractional share interests as herein provided.

         2.11  No Fractional Shares.  Notwithstanding any other term or
provision of this Agreement, no fractional PSP11 Shares and no certificates or
script therefor, or other evidence of ownership thereof, will be issued in the
Merger.  In lieu of any such fractional share interests, each holder of AOPP
Shares or of PSP11 Series B and C Shares who would otherwise be entitled to such
fractional share will, upon surrender of the certificate representing such
shares, receive a whole PSP11 Share if such fractional share to which such
holder would otherwise have been entitled is .5 of a

                                       5
<PAGE>
 
PSP11 Share or more, and such fractional share shall be disregarded if it
represents less than .5 of a PSP11 Share; provided, however, that, such
fractional share shall not be disregarded if such fractional share to which such
holder would otherwise have been entitled represents .5 of 1% or more of the
total number of PSP11 Shares such holder is entitled to receive in the Merger.
In such event, such holder shall be paid an amount in cash (without interest),
rounded to the nearest $.01, determined by multiplying (i) the per share closing
price on the American Stock Exchange, Inc. of the PSP11 Shares at the Effective
Time by (ii) the factional interest.

         2.12  Dissenting Shares.  PSP11 Shares, PSP11 Series B and C Shares and
AOPP Shares held by a holder who has demanded and perfected his right to an
appraisal of such shares in accordance with Section 1300 et seq. of the GCLC and
who has not effectively withdrawn or lost his right to appraisal ("Dissenting
Shares") shall not continue to be owned by the holder thereof or converted into
or represent the right to receive cash and/or PSP11 Shares, but the holder
thereof shall be entitled only to such rights as are granted by Section 1300 et
seq. of the GCLC.  Each holder of Dissenting Shares who becomes entitled to
payment for PSP11 Shares, PSP11 Series B and C Shares or AOPP Shares pursuant to
these provisions of the GCLC shall receive payment therefor from the Surviving
Corporation in accordance therewith.  If any holder of PSP11 Shares, PSP11
Series B and C Shares or AOPP Shares who demands appraisal in accordance with
Section 1300 et seq. of the GCLC shall effectively withdraw with the consent of
the Surviving Corporation or lose (through failure to perfect or otherwise) his
right to appraisal with respect to PSP11 Shares, PSP11 Series B and C Shares or
AOPP Shares, such shares shall continue to be owned by the holder thereof or
shall automatically be converted into the right to receive PSP11 Shares pursuant
to Section 2.3.2, 2.4.2 or 2.5.2 hereof, as the case may be.

         2.13  Assumption of AOPP Options.  At the Effective Time, each
outstanding option to purchase AOPP Shares (an "AOPP Option") granted under
AOPP's 1997 Stock Option and Incentive Plan (the "AOPP Plan") shall be assumed
by PSP11 and, whether vested or unvested, shall be converted into, and shall be
deemed to constitute, an option to acquire, on the same terms and conditions
applicable to the AOPP Option, the number of shares of PSP11 Shares that the
holder of the AOPP Option would have received in the Merger if the AOPP Option
had been exercised in full immediately prior to the Effective Time, irrespective
of whether the AOPP Option was in fact then exercisable (a "Converted Option").
The exercise price per share of a Converted Option shall be the aggregate
exercise price of the AOPP Option divided by the number of PSP11 Shares
purchasable upon exercise of the Converted Option.  As soon as practicable after
the Effective Time, PSP11 shall deliver to each holder of an AOPP Option an
appropriate notice setting forth the holder's rights pursuant thereto.  PSP11
shall comply with the terms of each AOPP Option and take all corporate action
necessary to reserve for issuance a sufficient number of PSP11 Shares for
delivery upon exercise of the Converted Options.

         2.14  Exchange of Deeds.  At the Effective Time, (i) PSP11 will receive
from escrow deeds for the PSI Exchange Properties and (ii) PSI will receive from
escrow deeds for the PSP11 Exchange Properties.  PSP11 and PSI acknowledge that
the PSP11 Exchange Properties, and the PSI Exchange Properties, have the
respective values set forth in Exhibits B and C hereto.  PSP11 and PSI also
acknowledge that the Exchange is intended to qualify, as to each of PSP11 and
PSI, for "like-kind exchange" treatment under Section 1031 of the Code.

     3.  Closing.

         3.1   Time and Place of Closing.  If this Agreement is approved by the
shareholders of PSP11, a meeting (the "Closing") shall take place as promptly as
practicable thereafter at which the parties will exchange certificates and other
documents as required by this Agreement.  Such Closing shall take place at such
time and place as PSP11 may designate.  The date of the Closing shall be
referred to as the "Closing Date."

                                       6
<PAGE>
 
         3.2  Execution and Filing of Merger Agreement.  At or before the
Closing and after shareholder approval by PSP11 and AOPP, PSP11 and AOPP shall
execute and deliver the Merger Agreement, together with the requisite Officers'
Certificates, for filing with the California Secretary of State.  The Merger
Agreement, together with the requisite Officers' Certificates, shall be duly
filed with the California Secretary of State in accordance with the GCLC as soon
as practicable following the Closing.

     4.  Representations, Warranties and Agreements of PSP11.  PSP11 represents,
warrants and agrees with AOPP and PSI that:

         4.1   Authorization.  Subject to approval of this Agreement by the
shareholders of PSP11, (i) the execution, delivery and performance of this
Agreement by PSP11 has been duly authorized and approved by all necessary
corporate action of PSP11 and (ii) PSP11 has necessary corporate power and
authority to enter into this Agreement, to perform its obligations hereunder and
to complete the transactions contemplated hereby.

         4.2   Organization and Related Matters.  PSP11 is a corporation duly
organized, existing and in good standing under the laws of the State of
California with all requisite corporate power and authority to own, lease and
operate its properties and to carry on its business as and where now owned,
leased, operated or carried on, as the case may be; and is duly qualified to do
business as a foreign corporation and is in good standing in each jurisdiction
in which the property owned, leased or operated by it or the nature of the
business carried on by it requires such qualification and where the failure to
so qualify would have a material adverse effect on the business, properties,
results of operations or financial condition of PSP11.  PSP11 has no direct or
indirect equitable or beneficial interest in any other corporation other than
PSCC, Inc.

         4.3   Capital Stock.  The authorized capital stock of PSP11 consists
solely of (i) 2,828,929 shares of Common Stock Series A ($.01 par value),
1,819,937 of which were issued and outstanding as of August 18, 1997, (ii)
184,453 shares of Common Stock Series B ($.01 par value), all of which were
issued and outstanding as of August 18, 1997 and (iii) 522,618 shares of Common
Stock Series C ($.01 par value), all of which were issued and outstanding as of
August 18, 1997 (47,824 of which will be cancelled immediately prior to the
Merger).  All of the issued and outstanding shares of capital stock of PSP11
have been duly and validly authorized and issued, and are fully paid and
nonassessable.  There are no options or agreements to which PSP11 is a party or
by which it is bound calling for or requiring the issuance of any of PSP11's
capital stock, except (A) the PSP11 Common Stock Series B and C is convertible
into PSP11 Shares in accordance with PSP11's Articles of Incorporation and (B)
as provided in this Agreement.

         4.4   Consents and Approvals; No Violation.  Assuming approval of the
Merger and of this Agreement by the shareholders of PSP11, neither the execution
and delivery of this Agreement nor the consummation by PSP11 of the transactions
contemplated hereby will: (i) conflict with or result in any breach of any
provision of its Articles of Incorporation or Bylaws; (ii) require any consent,
waiver, approval, authorization or permit of, or filing with or notification to,
any governmental or regulatory authority, except (A) in connection with the
applicable requirements, if any, of the Hart-Scott-Rodino Antitrust Improvements
Act of 1976, as amended (the "HSR Act"), (B) pursuant to the applicable
requirements of the federal securities laws and the rules and regulations
promulgated thereunder, (C) the filing of the Merger Agreement and Officers'
Certificates pursuant to the GCLC and appropriate documents with the relevant
authorities of other states in which PSP11 is authorized to do business, (D) in
connection with any state or local tax which is attributable to the beneficial
ownership of PSP11's real property, (E) as may be required by any applicable
state securities or takeover laws, or (F) where the failure to obtain such
consent, approval, authorization or permit, or to make such filing or
notification, would not in the aggregate have a material adverse effect on PSP11
or adversely affect the ability of PSP11 to consummate the transactions
contemplated hereby; (iii) result in a violation or breach

                                       7
<PAGE>
 
of, or constitute a default (or give rise to any right of termination,
cancellation or acceleration) under any of the terms, conditions or provisions
of any note, license, mortgage, agreement or other instrument or obligation to
which PSP11 is a party or any of its properties or assets may be bound, except
for such violations, breaches and defaults which, in the aggregate, would not
have a material adverse effect on PSP11 or adversely affect the ability of PSP11
to consummate the transactions contemplated hereby; or (iv) assuming the
consents, approvals, authorizations or permits and filings or notifications
referred to in this Section 4.4 are duly and timely obtained or made, violate
any order, writ, injunction, decree, statute, rule or regulation applicable to
PSP11 or its properties or assets, except for violations which would not in the
aggregate have a material adverse effect on PSP11 or adversely affect the
ability of PSP11 to consummate the transactions contemplated hereby.

         4.5   Litigation.  There is no litigation, proceeding or governmental
investigation which, individually or in the aggregate, is or may be material and
adverse, pending or, to the knowledge of PSP11, threatened against PSP11 or
involving any of its properties or assets.

         4.6   SEC Reports.  Since January 1, 1994, PSP11 has filed all forms,
reports and documents with the Securities and Exchange Commission ("SEC")
required to be filed by it pursuant to the federal securities laws and the rules
and regulations promulgated by the SEC thereunder, all of which complied in all
material respects with all applicable requirements of the federal securities
laws and such rules and regulations (collectively, the "PSP11 SEC Reports").
None of the PSP11 SEC Reports, including without limitation any financial
statements or schedules included therein, at the time filed contained any untrue
statement of a material fact or omitted to state a material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading.

         4.7   Financial Statements.  The financial statements included in the
PSP11 SEC Reports complied as to form in all material respects with applicable
accounting requirements and the published rules and regulations of the SEC with
respect thereto, have been prepared in accordance with generally accepted
accounting principles applied on a basis consistent with prior periods (except
as otherwise noted therein), and present fairly the financial position of PSP11
as of their respective dates, and the results of operations of PSP11 for the
periods presented therein (subject, in the case of the unaudited interim
financial statements, to normal year-end adjustments).

         4.8   Absence of Certain Changes or Events.  Since January 1, 1997, the
business of PSP11 has been carried on only in the ordinary and usual course and
there has not been any material adverse change in its business, results of
operations or financial condition, or any damage or destruction in the nature of
a casualty loss, whether covered by insurance or not, that would materially and
adversely affect its properties, business or results of operations.

         4.9   S-4 Registration Statement and Proxy Statement and Prospectus.
None of the information supplied or to be supplied by PSP11 for inclusion or
incorporation by reference in the S-4 Registration Statement or the Proxy
Statement and Prospectus (as such terms are defined in Section 7.5 hereof) will
(i) in the case of the S-4 Registration Statement, at the time it becomes
effective and at the Effective Time, contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein not misleading, or (ii) in the
case of the Proxy Statement and Prospectus, at the time of the mailing of the
Proxy Statement and Prospectus and at the time of the meeting of the
shareholders of PSP11, contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary in order
to make the statements therein, in light of the circumstances under which they
are made, not misleading.

                                       8
<PAGE>
 
         4.10  Insurance.  All material insurance of PSP11 is currently in full
force and effect and PSP11 has reported all claims and occurrences to the extent
required by such insurance.

         4.11  PSP11 Exchange Properties.  PSP11 has valid and insurable fee
simple title to the PSP11 Exchange Properties, free and clear of all liens and
encumbrances, subject to certain matters that do not materially impair the use
or value of the respective PSP11 Exchange Property to which they relate.

         4.12  PSI Exchange Properties.  PSP11 agrees that it will not dispose
of the PSI Exchange Properties for at least a period of two years after the
Effective Time.

         4.13  Disclosure.  The representations and warranties by PSP11 in this
Agreement and any certificate or document delivered by it pursuant hereto do not
and will not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements contained herein or therein not
misleading.

     5.  Representations, Warranties and Agreements of AOPP.  AOPP hereby
represents, warrants and agrees with PSP11 and PSI that:

         5.1   Authorization.  Subject to approval of this Agreement by the
shareholders of AOPP, (i) the execution, delivery and performance of this
Agreement by AOPP has been duly authorized and approved by all necessary
corporate action of AOPP and (ii) AOPP has all necessary corporate power and
authority to enter into this Agreement, to perform its obligations hereunder and
to complete the transactions contemplated hereby.

         5.2   Organization and Related Matters.  AOPP is a corporation duly
organized, existing and in good standing under the laws of the State of
California, with all requisite corporate power and authority to own, lease and
operate its properties and to carry on its business as and where now owned,
leased, operated or carried on, as the case may be; and is duly qualified to do
business as a foreign corporation and is in good standing in each jurisdiction
in which the property owned, leased or operated by it or the nature of the
business carried on by it requires such qualification and where the failure to
so qualify would have a material adverse effect on the business, properties,
results of operations or financial condition of AOPP.

         5.3   Capital Stock.  The authorized capital stock of AOPP consists
solely of (i) 100,000,000 shares of Common Stock ($.10 par value), 3,523,500 of
which were issued and outstanding as of August 18, 1997 and (ii) 100,000,000
shares of Preferred Stock ($.10 par value), none of which were issued and
outstanding as of August 18, 1997.  All of the issued and outstanding shares of
Common Stock of AOPP have been duly and validly authorized and issued, and are
fully paid and nonassessable.

         5.4   Consents and Approvals; No Violation.  Neither the execution and
delivery of this Agreement nor the consummation by AOPP of the transactions
contemplated hereby will: (i) conflict with or result in any breach of any
provision of its Articles of Incorporation or Bylaws; (ii) require any consent,
waiver, approval, authorization or permit of, or filing with or notification to,
any governmental or regulatory authority, except (A) in connection with the
applicable requirements, if any, of the HSR Act, (B) pursuant to the applicable
requirements of the federal securities laws and the rules and regulations
promulgated thereunder, (C) the filing of the Merger Agreement and Officers'
Certificates pursuant to the GCLC and appropriate documents with the relevant
authorities of other states in which AOPP is authorized to do business, (D) in
connection with any state or local tax which is attributable to the beneficial
ownership of AOPP's real property, (E) as may be required by any applicable
state securities or takeover laws, or (F) where the failure to obtain such
consent, approval, authorization or permit, or to make such filing or
notification, would not in the aggregate have a material adverse effect on

                                       9
<PAGE>
 
AOPP or adversely affect the ability of AOPP to consummate the transactions
contemplated hereby; (iii) result in a violation or breach of, or constitute a
default (or give rise to any right of termination, cancellation or acceleration)
under any of the terms, conditions or provisions of any note, license, mortgage,
agreement or other instrument or obligation to which AOPP is a party or any of
its properties or assets may be bound, except for such violations, breaches and
defaults which, in the aggregate, would not have a material adverse effect on
AOPP or adversely affect the ability of AOPP to consummate the transactions
contemplated hereby; or (iv) assuming the consents, approvals, authorizations or
permits and filings or notifications referred to in this Section 5.4 are duly
and timely obtained or made, violate any order, writ, injunction, decree,
statute, rule or regulation applicable to AOPP or its properties or assets,
except for violations which would not in the aggregate have a material adverse
effect on AOPP or adversely affect the ability of AOPP to consummate the
transactions contemplated hereby.

         5.5   Litigation. There is no litigation, proceeding or governmental
investigation which, individually or in the aggregate, is or may be material and
adverse, pending or, to the knowledge of AOPP, threatened against AOPP or
involving any of its properties or assets.

         5.6   Financial Statements.  The financial statements of AOPP as of and
for the periods ended December 31, 1994, 1995 and 1996 and June 30, 1996 and
1997, have been prepared in accordance with generally accepted accounting
principles applied on a basis consistent with prior periods (except as otherwise
noted therein), and present fairly the financial position of AOPP as of their
respective dates, and the results of operations of AOPP for the periods
presented therein (subject, in the case of the unaudited interim financial
statements, to normal year-end adjustments).

         5.7   Absence of Certain Changes or Events.  Since January 1, 1997, the
business of AOPP has been carried on only in the ordinary and usual course and
there has not been any material adverse change in its business, results of
operations or financial condition, or any damage or destruction in the nature of
a casualty loss, whether covered by insurance or not, that would materially and
adversely affect its properties, business or results of operations.

         5.8   S-4 Registration Statement and Proxy Statement and Prospectus.
None of the information supplied or to be supplied by AOPP for inclusion or
incorporation by reference in the S-4 Registration Statement or the Proxy
Statement and Prospectus (as those terms are defined in Section 7.5 hereof) will
(i) in the case of the S-4 Registration Statement, at the time it becomes
effective and at the Effective Time, contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein not misleading, or (ii) in the
case of the Proxy Statement and Prospectus, at the time of the mailing of the
Proxy Statement and Prospectus and at the time of the meeting of the
shareholders of PSP11, contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary in order
to make the statements therein, in light of the circumstances under which they
are made, not misleading.

         5.9   Insurance.  All material insurance of AOPP is currently in full
force and effect and AOPP has reported all claims and occurrences to the extent
required by such insurance.

         5.10  Disclosure.  The representations and warranties by AOPP in this
Agreement and any certificate or document delivered by it pursuant hereto do not
and will not contain any untrue statement of a material fact or omit to state a
material fact necessary to make the statements contained herein or therein not
misleading.

                                       10
<PAGE>
 
     6.  Representations, Warranties and Agreements of PSI.  PSI hereby
represents, warrants and agrees with PSP11 and AOPP that:

         6.1   Authorization.  The execution, delivery and performance of this
Agreement by PSI has been duly authorized and approved by all necessary
corporate action of PSI, and PSI has all necessary corporate power and authority
to enter into this Agreement, to perform its obligations hereunder and to
complete the transactions contemplated hereby.

         6.2   Organization and Related Matters.  PSI is a corporation duly
organized, existing and in good standing under the laws of the State of
California, with all requisite corporate power and authority to own, lease and
operate its properties and to carry on its business as and where now owned,
leased, operated or carried on, as the case may be; and is duly qualified to do
business as a foreign corporation and is in good standing in each jurisdiction
in which the property owned, leased or operated by it or the nature of the
business carried on by it requires such qualification and where the failure to
so qualify would have a material adverse effect on the business, properties,
results of operations or financial condition of PSI.

         6.3   S-4 Registration Statement and Proxy Statement and Prospectus.
None of the information supplied or to be supplied by PSI for inclusion or
incorporation by reference in the S-4 Registration Statement or the Proxy
Statement and Prospectus (as those terms are defined in Section 7.5 hereof) will
(i) in the case of the S-4 Registration Statement, at the time it becomes
effective and at the Effective Time, contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or
necessary in order to make the statements therein not misleading, or (ii) in the
case of the Proxy Statement and Prospectus, at the time of the mailing of the
Proxy Statement and Prospectus and at the time of the meeting of the
shareholders of PSP11, contain any untrue statement of a material fact or omit
to state any material fact required to be stated therein or necessary in order
to make the statements therein, in light of the circumstances under which they
are made, not misleading.

         6.4   PSI Exchange Properties.  PSI has valid and insurable fee simple
title to the PSI Exchange Properties, free and clear of all liens and
encumbrances, subject to certain matters that do not materially impair the use
or value of the respective PSI Exchange Property to which they relate.

         6.5   PSP11 Exchange Properties.  PSI agrees that it will not dispose
of the PSP11 Exchange Properties for at least a period of two years after the
Effective Time.

     7.  Covenants and Agreements.

         7.1   Ordinary Course.  Except as contemplated by this Agreement,
during the period from the date of this Agreement to the Effective Time, each of
PSP11 and AOPP will carry on its business in the ordinary course in
substantially the same manner as heretofore conducted and use all reasonable
efforts to: (a) preserve intact its present business, organization and goodwill,
(b) maintain all permits, licenses and authorizations required by applicable
laws and (c) keep available the services of its present employees and preserve
its relationships with customers, suppliers, lenders, lessors, governmental
entities and others having business or regulatory dealings with it.  Without the
consent of the other, PSP11 and AOPP will not issue any capital stock or debt
securities convertible into capital stock.  Each of PSP11 and AOPP will promptly
notify the other of any event or occurrence not in the ordinary and usual course
of business or which may have a material adverse effect on the properties or
financial condition of such party.

         7.2   Meeting of Shareholders.

                                       11
<PAGE>
 
          7.2.1  PSP11.  PSP11 will take all action necessary in accordance with
applicable law to convene a meeting of its shareholders as promptly as
practicable to consider and vote upon approval of this Agreement, it being
understood that (i) the principal terms of the Agreement must be approved by the
affirmative vote of a majority of the outstanding shares of Common Stock Series
A, Common Stock Series B and Common Stock Series C of PSP11, counted together as
a single class, and (ii) the shares of Common Stock Series B and Common Stock
Series C of PSP11 will be voted with the holders of a majority of the
unaffiliated shares of Common Stock Series A of PSP11.

          7.2.2      AOPP.  AOPP will take all action necessary in accordance
with applicable law to convene a meeting of its shareholders as promptly as
practicable to consider and vote upon approval of this Agreement.

         7.3   Tax Reporting.  Each of PSP11 and AOPP agrees to report the
Merger for federal and state income tax purposes, as a reorganization of the
type described in Section 368(a)(1)(A) of the Code.

         7.4   Acquisition Proposals.  PSP11 will not initiate, solicit or
encourage, directly or indirectly, any inquiries or the making of any proposal
with respect to a merger, consolidation, share exchange or similar transaction
involving PSP11, or any purchase of all or any significant portion of the assets
of PSP11, or any equity interest in PSP11, other than the transactions
contemplated hereby (an "Acquisition Proposal"), or engage in any negotiations
concerning, or provide any confidential information or data to, or have any
discussions with, any person relating to an Acquisition Proposal; provided,
however, that the Board of Directors on behalf of PSP11 may furnish or cause to
be furnished information and may participate in such discussions and
negotiations through its representatives with persons who have sought the same
if the failure to provide such information or participate in such negotiations
and discussions might cause the members of the Board of Directors to breach
their fiduciary duty to PSP11's shareholders under applicable law as advised by
counsel.  PSP11 will notify PSI immediately if any such inquiries or proposals
are received by, any such information is requested from, or any such
negotiations or discussions are sought to be initiated or continued with PSP11,
and will keep AOPP informed of the status and terms of any such proposals and
any such negotiations or discussions.

         7.5   Registration and Proxy Statements.  PSP11 and AOPP will promptly
prepare and file with the SEC a preliminary proxy statement in connection with
the vote of shareholders of PSP11 with respect to the Merger.  PSP11 will, as
promptly as practicable, prepare and file with the SEC a registration statement
on Form S-4 (the "S-4 Registration Statement"), containing a proxy
statement/prospectus, in connection with the registration under the Securities
Act of 1933, as amended (the "Securities Act") of the PSP11 Shares to be issued
to holders of AOPP Shares in the Merger (such proxy statement/prospectus,
together with any amendments thereof or supplements thereto, in the form or
forms to be mailed or delivered to the shareholders of PSP11 and AOPP, being
herein called the "Proxy Statement and Prospectus").  PSP11 and AOPP will each
use its best efforts to have or cause the S-4 Registration Statement to be
declared effective as promptly as practicable, and also will take any other
action required to be taken under federal or state securities laws, and PSP11
and AOPP will use their best efforts to cause the Proxy Statement and Prospectus
to be mailed to their respective shareholders at the earliest practicable date.
PSP11 agrees that if at any time prior to the Effective Time any event with
respect to PSP11 should occur which is required to be described in an amendment
of, or a supplement to, the Proxy Statement and Prospectus or the S-4
Registration Statement, such event shall be so described, and such amendment or
supplement shall be promptly filed with the SEC and, as required by law,
disseminated to the shareholders of PSP11 and AOPP and (ii) the Proxy Statement
and Prospectus will (with respect to PSP11) comply as to form in all material
respects with the requirements of the federal securities laws.  AOPP agrees that
(i) if at any time prior to

                                       12
<PAGE>
 
the Effective Time any event with respect to AOPP should occur which is required
to be described in an amendment of, or a supplement to, the Proxy Statement and
Prospectus or the S-4 Registration Statement, such event shall be so described,
and such amendment or supplement shall be promptly filed with the SEC and, as
required by law, disseminated to the shareholders of PSP11 and (ii) the Proxy
Statement and Prospectus will (with respect to AOPP) comply as to form in all
material respects with the requirements of the federal securities laws.

         7.6   Best Efforts.  Each of PSP11 and AOPP shall:  (i) promptly make
its respective filings and thereafter make any other required submissions under
all applicable laws with respect to the Merger and the other transactions
contemplated hereby; and (ii) use its best efforts to promptly take, or cause to
be taken, all other actions and do, or cause to be done, all other things
necessary, proper or appropriate to consummate and make effective the
transactions contemplated by this Agreement as soon as practicable.

         7.7   Registration and Listing of PSP11 Shares.  PSP11 will use its
best efforts to register under the applicable provisions of the Securities Act
the shares of PSP11 Common Stock to be issued in the Merger and to cause such
shares to be listed for trading on the AMEX upon official notice of issuance.

         7.8   Distributions.  Neither PSP11 nor AOPP will, at any time prior to
the Effective Time, declare or pay any cash distribution on its capital stock or
make any other distribution of assets to its shareholders, except regular
quarterly dividends consistent with prior practice.

     8.  Conditions.

         8.1   Conditions to Each Party's Obligations.  The respective
obligations of each party to consummate the transactions contemplated by this
Agreement are subject to the fulfillment at or prior to the Closing of each of
the following conditions, any or all of which may be waived in whole or in part,
to the extent permitted by applicable law:

          8.1.1      Shareholder Approval.  This Agreement and the transactions
contemplated hereby shall have been duly approved by both the shareholders of
PSP11 and the shareholders of AOPP as contemplated by Sections 7.2.1 and 7.2.2
hereof.

          8.1.2      Governmental and Regulatory Consents.   All filings
required to be made prior to the Effective Time with, and all consents,
approvals, permits and authorizations required to be obtained prior to the
Effective Time from, governmental and regulatory authorities in connection with
the execution and delivery of this Agreement and the consummation of the
transactions contemplated hereby (including the expiration of the waiting period
requirements of the HSR Act) shall have been made or obtained (as the case may
be) without material restrictions, except where the failure to obtain such
consents, approvals, permits and authorizations could not reasonably be expected
to have a material adverse effect on PSP11, AOPP or PSI.

          8.1.3      Litigation.  No court or governmental or regula tory
authority of competent jurisdiction shall have enacted, issued, promulgated,
enforced or entered any statute, rule, regulation, judgment, decree, injunction
or other order (whether temporary, preliminary or permanent) or taken any action
which prohibits the consummation of the transactions contemplated by this
Agreement; provided, however, that the party invoking this condition shall use
its best efforts to have any such judgment, decree, injunction or other order
vacated.

          8.1.4      Registration Statement.  The S-4 Registration Statement
shall have been declared effective and no stop order suspending effectiveness
shall have been issued, no action, suit, proceeding or investigation by the SEC
to suspend the effectiveness thereof shall have

                                       13
<PAGE>
 
been initiated and be continuing, and all necessary approvals under federal and
state securities laws relating to the issuance or trading of the shares of PSP11
Common Stock to be issued in the Merger shall have been received.

          8.1.5      Listing of PSP11 Shares on AMEX.  The shares of PSP11
Common Stock to be issued in the Merger shall have been approved for listing on
the AMEX upon official notice of issuance.

          8.1.6      PSP11 Fairness Opinion.  The Board of Directors of PSP11
shall have received the opinion of Jefferies & Company, Inc. in form and
substance satisfactory to it to the effect that the terms of the Merger are,
from a financial point of view, fair to the public shareholders of PSP11, and
such opinion shall not have been withdrawn or revoked.

          8.1.7      Tax Opinion.  The Board of Directors of PSP11 and AOPP
shall have received a legal opinion of Hogan & Hartson L.L.P. that the Merger
will qualify as a tax-free reorganization under Section 368(a) of the Code.

          8.1.8      PSI Board Approval.  This Agreement and the transactions
contemplated hereby shall have been duly approved by the Board of Directors of
PSI.

          8.1.9      Merger and Exchange. The Merger and the Exchange are
conditioned on each other.

    8.2   Conditions to Obligations of PSP11.  The obligations of PSP11 to
consummate the transactions contemplated by this Agreement are subject to the
fulfillment at or prior to the Closing of the following conditions, which may be
waived in whole or in part by PSP11 to the extent permitted by applicable law:

          8.2.1      Accuracy of Representations; Performance of Agreements.
Each of the representations and warranties of AOPP and PSI contained in this
Agreement shall be true and correct in all material respects at and as of the
Closing Date as if made at and as of the Closing Date (except to the extent they
relate to a particular date) and AOPP and PSI shall have performed or complied
with all agreements and covenants required by this Agreement to be performed or
complied with by them at or prior to the Closing.

          8.2.2      Deeds and Cash.  PSI shall have delivered into escrow
deeds, in form and substance satisfactory to PSP11, for the PSI Exchange
Properties.

          8.2.3      Certificate of Officers.  PSP11 shall have received such
certificates of officers of AOPP and PSI as PSP11 may reasonably request in
connection with the Closing, including upon request a certificate satisfactory
to it of the Chief Executive Officers and the Chief Financial Officers of AOPP
and PSI to the effect that, to the best of their knowledge, all representations
and warranties of their respective corporation contained in this Agreement are
true and correct in all material respects at and as of the Closing Date as if
made at and as of the Closing Date, and their respective corporation has
performed or complied with all agreements and covenants required by this
Agreement to be performed or complied with at or prior to the Closing.

          8.2.4      Title to Properties; Environmental Audits.  PSP11 in its
sole discretion shall be satisfied as to the status of title to (including the
existence and effect of liens and encumbrances), and the results of an
environmental audit of, each of the real properties owned by AOPP and each of
the PSI Exchange Properties.

          8.2.5      Dissenting Shares.  None of the AOPP Shares shall have
become Dissenting Shares.

                                       14
<PAGE>
 
          8.3        Conditions to Obligations of AOPP. The obligations of AOPP
to consummate the transactions contemplated by this Agreement are subject to the
fulfillment at or prior to the Closing of the following conditions, which may be
waived in whole or in part by AOPP to the extent permitted by applicable law.

          8.3.1      Accuracy of Representations; Performance of Agreements.
Each of the representations and warranties of PSP11 and PSI contained in this
Agreement shall be true and correct in all material respects at and as of the
Closing Date as if made at and as of the Closing Date (except to the extent they
relate to a particular date) and PSP11 and PSI shall have performed or complied
in all material respects with all agreements and covenants required by this
Agreement to be performed or complied with by them at or prior to the Closing.

          8.3.2      Certificate of Officers.  AOPP shall have received such
certificates of officers of PSP11 and PSI as AOPP may reasonably request in
connection with the Closing, including upon request a certificate satisfactory
to it of the Chief Executive Officers and the Chief Financial Officers of PSP11
and PSI to the effect that, to the best of their knowledge, all representations
and warranties of their respective corporation contained in this Agreement are
true and correct in all material respects at and as of the Closing Date as if
made at and as of the Closing Date, and their respective corporation has
performed or complied with all agreements and covenants required by this
Agreement to be performed or complied with at or prior to the Closing.

          8.3.3      Title to Properties; Environmental Audits.  AOPP in its
sole discretion shall be satisfied as to the status of title to (including the
existence and effect of liens and encumbrances), and the results of an
environmental audit of, each of the real properties owned by PSP11.

          8.3.4      Dissenting Shares.  Less than 5% of the outstanding PSP11
Shares shall have become Dissenting Shares.

          8.4        Conditions to Obligations of PSI. The obligations of PSI to
consummate the transactions contemplated by this Agreement are subject to the
fulfillment at or prior to the Closing of the following conditions, which may be
waived in whole or in part by PSI to the extent permitted by applicable law.

          8.4.1      Accuracy of Representations; Performance of Agreements.
Each of the representations and warranties of PSP11 and AOPP contained in this
Agreement shall be true and correct in all material respects at and as of the
Closing Date as if made at and as of the Closing Date (except to the extent they
relate to a particular date) and PSP11 and AOPP shall have performed or complied
in all material respects with all agreements and covenants required by this
Agreement to be performed or complied with by them at or prior to the Closing.

          8.4.2      Deeds.  PSP11 shall have delivered into escrow deeds, in
form and satisfactory to PSI, for the PSP11 Exchange Properties.

          8.4.3      Certificate of Officers.  PSI shall have received such
certificates of officers of PSP11 and AOPP as PSI may reasonably request in
connection with the Closing, including upon request a certificate satisfactory
to it of the Chief Executive Officers and the Chief Financial Officers of PSP11
and AOPP to the effect that, to the best of their knowledge, all representations
and warranties of their respective corporation contained in this Agreement are
true and correct in all material respects at and as of the Closing Date as if
made at and as of the Closing Date, and their respective corporation has
performed or complied with all agreements and covenants required by this
Agreement to be performed or complied with at or prior to the Closing.

                                       15
<PAGE>
 
     9.  Termination.

         9.1   Termination by Mutual Consent.  This Agreement may be terminated
and the Merger may be abandoned at any time prior to the Effective Time, before
or after shareholder approval, by the mutual written consent of PSP11, AOPP and
PSI.

         9.2   Termination by PSP11, AOPP or PSI.  This Agreement may be
terminated and the Merger and the Exchange may be abandoned by action of the
Board of Directors of any of PSP11, AOPP or PSI if (i) both the Merger and the
Exchange shall not have been consummated by December 31, 1998 (provided that the
right to terminate this Agreement under this Section 9.2(i) shall not be
available to any party whose failure to fulfill any obligation under this
Agreement has been the cause of or resulted in the failure of the Merger to
occur on or before such date); (ii) any court of competent jurisdiction in the
United States or some other governmental body or regulatory authority shall have
issued an order, decree or ruling or taken any other action permanently
restraining, enjoining or otherwise prohibiting the Merger and such order,
decree, ruling or other action shall have become final and nonappealable; or
(iii) the shareholders of either PSP11 or AOPP shall have failed to approve this
Agreement and the transactions contemplated hereby at its respective meeting of
shareholders.

         9.3   Termination by PSP11.  This Agreement may be terminated by PSP11
and the Merger and the Exchange may be abandoned at any time prior to the
Effective Time, if (i) AOPP or PSI shall have failed to comply in any material
respect with any of the covenants, conditions or agreements contained in this
Agreement to be complied with or performed by AOPP or PSI, respectively, at or
prior to such date of termination, which failure to comply has not been cured
within five business days following notice to such party of such failure to
comply or (ii) any representation or warranty of AOPP or PSI contained in this
Agreement shall not be true in all material respects when made, which inaccuracy
or breach (if capable of cure) has not been cured within five business days
following notice to such party of the inaccuracy or breach, or on and as of the
Closing as if made on and as of the Closing Date.

         9.4   Termination by AOPP.  This Agreement may be terminated by AOPP
and the Merger and the Exchange may be abandoned at any time prior to the
Effective Time, before or after shareholder approval, if (i) PSP11 or PSI shall
have failed to comply in any material respect with any of the covenants,
conditions or agreements contained in this Agreement to be complied with or
performed by PSP11 or PSI, respectively, at or prior to such date of
termination, which failure to comply has not been cured within five business
days following notice to such party of such failure to comply or (ii) any
representation or warranty of PSP11 or PSI contained in this Agreement shall not
be true in all material respects when made, which inaccuracy or beach (if
capable of cure) has not been cured within five business days following notice
to such party of the inaccuracy or breach, or on and as of the Closing as if
made on and as of the Closing Date.

         9.5   Termination by PSI.  This Agreement may be terminated by PSI and
the Merger and the Exchange may be abandoned at any time prior to the Effective
Time, before or after shareholder approval, if (i) PSP11 or AOPP shall have
failed to comply in any material respect with any of the covenants, conditions
or agreements contained in this Agreement to be complied with or performed by
PSP11 or AOPP, respectively, at or prior to such date of termination, which
failure to comply has not been cured within five business days following notice
to such party of such failure to comply or (ii) any representation or warranty
of PSP11 or AOPP contained in this Agreement shall not be true in all material
respects when made, which inaccuracy or beach (if capable of cure) has not been
cured within five business days following notice to such party of the inaccuracy
or breach, or on and as of the Closing as if made on and as of the Closing Date.

         9.6   Effect of Termination and Abandonment.  In the event of
termination of this Agreement and abandonment of the Merger and the

                                       16
<PAGE>
 
Exchange pursuant to this Section 9, no party (or any directors, officers,
employees, agents or representatives of any party) shall have any liability or
further obligation to any other party or any person who controls a party within
the meaning of the Securities Act, except as provided in Section 10.1 and except
that nothing herein will relieve any party from liability for any breach of this
Agreement.

     10. Miscellaneous.

         10.1  Payment of Expenses.  If the Merger and Exchange are consummated,
the Surviving Corporation shall pay all the expenses incident to preparing for,
entering into and carrying out this Agreement and the consummation of the
transactions contemplated hereby.  If the Merger and Exchange are not
consummated, each of PSP11, AOPP and PSI shall pay its own expenses, except that
PSP11, AOPP and PSI shall each pay one-third of any expenses incurred in
connection with the printing of the S-4 Registration Statement and the Proxy
Statement and Prospectus, the real estate appraisals and environmental audits of
the properties of PSP11, AOPP and PSI and preparation for real estate closings,
and any filing fees under the HSR Act, the Securities Act and the Securities
Exchange Act of 1934, as amended.

         10.2  Survival of Representations, Warranties and Covenants.  The
respective representations and warranties of PSP11, AOPP and PSI contained
herein or in any certificate or document delivered pursuant hereto shall expire
with and be terminated and extinguished by the effectiveness of the Merger and
shall not survive the Effective Time.  The sole right and remedy arising from a
misrepresentation or breach of warranty, or from the failure of any of the
conditions to be met, shall be the termination of this Agreement by the other
party.  This Section 10.2 shall not limit any covenant or agreement of the
parties, which by its terms contemplates performance at or after the Effective
Time.

         10.3  Modification or Amendment.  The parties may modify or amend this
Agreement by written agreement authorized by the Boards of Directors and
executed and delivered by officers of the respective parties; provided, however,
that after approval of this Agreement by the shareholders of PSP11 or AOPP, no
amendment shall be made which changes any of the principal terms of the Merger
or this Agreement, without the approval of the shareholders of such corporation.

         10.4  Waiver of Conditions.  The conditions to each of the parties'
obligations to consummate the Merger are for the sole benefit of such party and
may be waived by such party in whole or in part to the extent permitted by
applicable law.

         10.5  Governing Law.  This Agreement shall be governed by and construed
in accordance with the laws of the State of California, without giving effect to
the principles of conflict of laws thereof.

         10.6  Interpretation.  This Agreement has been negotiated by the
parties and is to be interpreted according to its fair meaning as if the parties
had prepared it together and not strictly for or against any party.  Each of the
capitalized terms defined in this Agreement shall, for all purposes of this
Agreement (and whether defined in the plural and used in the singular, or vice
versa), have the respective meaning assigned to such term in the Section in
which such meaning is set forth.  References in this Agreement to "parties" or a
"party" refer to parties to this Agreement unless expressly indicated otherwise.
At each place in this Agreement where the context so requires, the masculine,
feminine or neuter gender includes the others and the singular or plural number
includes the other.  "Including" means "including without limitation."

         10.7  Headings.  The descriptive headings contained in the Sections and
subsections of this Agreement are for convenience of reference only and shall
not affect in any way the meaning or interpretation of this Agreement.

                                       17
<PAGE>
 
         10.8  Parties in Interest.  This Agreement, and the rights, interests
and obligations created by this Agreement, shall bind and inure to the benefit
of the parties and their respective successors and permitted assigns, and shall
confer no right, benefit or interest upon any other person, including
shareholders of the respective parties.

         10.9  Notices.  All notices or other communications required or
permitted under this Agreement shall be in writing and shall be delivered
personally or sent by U.S. mail, postage prepaid, addressed as follows or such
other address as the party to be notified has furnished in writing by a notice
given in accordance with this Section 10.9:

               If to PSP11:

               Public Storage Properties XI, Inc.
               701 Western Avenue, Suite 200
               Glendale, California 91201-2397
               Attention:  B. Wayne Hughes
                          Chief Executive Officer

               If to AOPP:

               American Office Park Properties, Inc.
               701 Western Avenue, Suite 200
               Glendale, California 91201-2397
               Attention:  Ronald L. Havner, Jr.
                          Chief Executive Officer

               If to PSI:

               Public Storage, Inc.
               701 Western Avenue, Suite 200
               Glendale, California 91201-2397
               Attention:  Harvey Lenkin
                          President

Any such notice or communication shall be deemed given as of the date of
delivery, if delivered personally, or on the second day after deposit with the
U.S. Postal Service, if sent by U.S. mail.

         10.10 Counterparts.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
shall be considered one and the same agreement.

         10.11 Assignment.  No rights, interests or obligations of either party
under this Agreement may be assigned or delegated without the prior written
consent of the other party.

         10.12 Entire Agreement.  This Agreement, including the Merger
Agreement, embodies the entire agreement and understanding between the parties
pertaining to the subject matter hereof, and supersedes all prior agreements,
understandings, negotiations, representations and discussions, whether written
or oral.

         10.13 Severable Provisions.  If any of the provisions of this Agreement
may be determined to be illegal or otherwise unenforceable, in whole or in part,
the remaining provisions, and any partially enforceable provisions to the extent
enforceable, shall nevertheless be binding and enforceable.

         10.14 Further Action.  If at any time after the Effective Time, the
Surviving Corporation shall determine that any assignments, transfers, deeds or
other assurances are necessary or desirable to vest, perfect or confirm, of
record or otherwise, in the Surviving Corporation, title to any property or
rights of AOPP, the officers of either Constituent Corporation are fully
authorized in the name of AOPP or otherwise to execute and deliver such
documents and do all things necessary and proper to vest,

                                       18
<PAGE>
 
perfect or confirm title to such property or rights in the Surviving
Corporation.

     IN WITNESS WHEREOF, the parties have entered into this Agreement as of the
date first above written.

                                PUBLIC STORAGE PROPERTIES XI, INC.


                                By:  /s/ B. WAYNE HUGHES
                                     -------------------
                                     B. Wayne Hughes
                                     Chief Executive Officer

                                AMERICAN OFFICE PARK PROPERTIES, INC.


                                By:  /s/ RONALD L. HAVNER, JR.
                                     -------------------------
                                     Ronald L. Havner, Jr.
                                     Chief Executive Officer

                                PUBLIC STORAGE, INC.


                                By:  /s/ HARVEY LENKIN
                                     -----------------
                                     Harvey Lenkin
                                     President

                                       19
<PAGE>
 
                                                                       Exhibit A


                              AGREEMENT OF MERGER


     THIS AGREEMENT OF MERGER ("Agreement") is entered into as of this ____ day
of __________, 1997, by and between PUBLIC STORAGE PROPERTIES XI, INC., a
California corporation ("PSP11") and AMERICAN OFFICE PARK PROPERTIES, INC., a
California corporation ("AOPP") with reference to the following:

     A. PSP11 was incorporated in 1990 under the laws of California, and on the
date hereof has outstanding _______________ shares of Common Stock Series A,
$.01 par value (the "PSP11 Shares"),__________ shares of Common Stock Series B
and __________ shares of Common Stock Series C.

     B. AOPP was incorporated in 1987 under the laws of California, and on the
date hereof its authorized capital stock consists of 100,000,000 shares of
Common Stock, $.10 par value (the "AOPP Shares"), ___________ of which are
issued and outstanding and 100,000,000 shares of Preferred Stock ($.10 par
value), none of which are issued and outstanding.

     C. PSP11, AOPP and Public Storage, Inc. ("PSI") have entered into an
Agreement and Plan of Reorganization dated as of August ___, 1997 (the "Plan"),
setting forth certain representations, warranties, conditions and agreements
pertaining to the Merger (as defined below).

     D. The Boards of Directors of PSP11, AOPP and PSI have approved the Plan
and this Agreement of Merger, and the requisite shareholder approval has been
obtained.

     NOW, THEREFORE, the parties agree as follows:

                                   ARTICLE I

        1.1 The Merger.  At the Effective Time (as defined below), AOPP will be
merged with and into PSP11 (the "Merger") and PSP11 shall be the surviving
corporation.  PSP11 and AOPP are sometimes collectively referred to herein as
the "Constituent Corporations" and PSP11, as the surviving corporation of the
Merger, is sometimes referred to herein as the "Surviving Corporation."

        1.2 Effective Time.  The Merger shall become effective at the time at
which this Agreement, together with the requisite Officers' Certificates of
PSP11 and AOPP, are filed with the California Secretary of State (the "Effective
Time").

        1.3 Effect of the Merger.  At the Effective Time:

          (a) The separate corporate existence of AOPP shall cease and the
Surviving Corporation shall thereupon succeed, without other transfer, to all
the rights and property of AOPP and shall be subject to all the debts and
liabilities of AOPP in the same manner as if the Surviving Corporation had
itself incurred them; all rights of creditors and all liens upon the property of
each of the Constituent Corporations shall be preserved unimpaired, provided
that such liens upon property of AOPP shall be limited to the property affected
thereby immediately prior to the Effective Time; and any action or proceeding
pending by or against AOPP may be prosecuted to judgment, which shall bind the
Surviving Corporation, or the Surviving Corporation may be proceeded against or
substituted in its place.

          (b) The Articles of Incorporation of PSP11, as amended in the
following respect at the Effective Time, shall continue to be the Articles of
Incorporation of the Surviving Corporation until changed as

                                      A-1
<PAGE>
 
provided by law and its respective provisions.  Article I shall be amended to
read as follows:

                 The name of this corporation is American Office Park
Properties, Inc.

            (c) The directors of the Surviving Corporation immediately following
the Merger shall be the following:

                 Ronald L. Havner, Jr.
                 Harvey Lenkin
                 Vern O. Curtis
                 James Kropp
                 Jack D. Steele
                 Christopher Weil

                                   ARTICLE II

     2.1  Common Stock Series A of PSP11.  Each outstanding share of Common
Stock Series A ($.01 par value) of PSP11 (the "PSP11 Shares") would continue to
be owned by holders of PSP11 Shares or converted into the right to receive cash
as follows:

          (a) At the Effective Time, subject to Section 2.7.1 of the Plan, each
PSP11 Share as to which a cash election has been made in accordance with the
provisions of Section 2.6 of the Plan and has not been revoked, relinquished or
lost pursuant to Section 2.6 of the Plan (the "Cash Election Shares") shall be
converted into and shall represent the right to receive $20.50 in cash.  As soon
as practicable after the Effective Time, the registered holders of Cash Election
Shares shall be paid the cash to which they are entitled hereunder in respect of
such Cash Election Shares.

          (b) At the Effective Time, subject to Section 2.12 of the Plan, each
PSP11 Share (other than Cash Election Shares) shall continue to be owned by the
holders of the PSP11 Shares.

     2.2  Common Stock Series B and C of PSP11.  Each outstanding share of
Common Stock Series B and C ($.01 par value) of PSP11 (the "PSP11 Series B and C
Shares") would be converted into the right to receive cash or PSP11 Shares as
follows:

          (a) At the Effective Time, subject to Section 2.7.2 of the Plan, each
PSP11 Series B and C Share as to which a cash election has been made in
accordance with the provisions of Section 2.6 of the Plan and has not been
revoked, relinquished or lost pursuant to Section 2.6 of the Plan (the "Series B
and C Cash Election Shares") shall be converted into and shall represent the
right to receive $17.71 in cash.  As soon as practicable after the Effective
Time, the registered holders of Series B and C Cash Election Shares shall be
paid the cash to which they are entitled hereunder in respect of such Series B
and C Cash Election Shares.

          (b) At the Effective Time, subject to Section 2.12 of the Plan, each
PSP11 Series B and C Share (other than Series B and C Cash Election Shares)
shall be converted into 0.8641 PSP11 Shares.

     2.3  AOPP Shares.  Each outstanding share of Common Stock ($.10 par
value) of AOPP (the "AOPP Shares") would be converted into the right to receive
cash or PSP11 Shares as follows:

          (a) At the Effective Time, subject to Section 2.7.3 of the Plan, each
AOPP Share as to which a cash election has been made in accordance with the
provisions of Section 2.6 of the Plan and has not been revoked, relinquished or
lost pursuant to Section 2.6 of the Plan (the "AOPP Cash Election Shares") shall
be converted into and shall represent the right to receive $24.19 in cash.  As
soon as practicable after the Effective Time, the registered holders of AOPP
Cash Election Shares shall

                                      A-2
<PAGE>
 
be paid the cash to which they are entitled hereunder in respect of such AOPP
Cash Election Shares.

             (b)  At the Effective Time, subject to Section 2.12 of the Plan,
each AOPP Share (other than AOPP Cash Election Shares) shall be converted into
1.18 PSP11 Shares.

        2.4  Exchange of Certificates.  After the Effective Time, each holder of
a certificate theretofore evidencing outstanding PSP11 Series B and C Shares and
AOPP Shares which were converted into PSP11 Shares pursuant hereto, upon
surrender of such certificate to American Stock Transfer & Trust Company (the
"Exchange Agent") or such other agent or agents as shall be appointed by the
Surviving Corporation, shall be entitled to receive a certificate representing
the number of whole PSP11 Shares into which the PSP11 Series B and C Shares and
AOPP Shares theretofore represented by the certificate so surrendered shall have
been converted and cash payment in lieu of fractional share interests, if any.
As soon as practicable after the Effective Time, the Exchange Agent will send a
notice and a transmittal form to each holder of PSP11 Series B and C Shares and
AOPP Shares of record at the Effective Time whose stock shall have been
converted into PSP11 Shares, advising such holder of the effectiveness of the
Merger and the procedure for surrendering to the Exchange Agent certificates
evidencing PSP11 Series B and C Shares and AOPP Shares in exchange for
certificates evidencing PSP11 Shares.

        2.5  Status Until Surrendered.  Until surrendered as provided in Section
2.6 hereof, each outstanding certificate which, prior to the Effective Time,
represented PSP11 Series B and C Shares and AOPP Shares (other than Dissenting
Shares (as defined below), if any) will be deemed for all corporate purposes to
evidence ownership of the number of whole PSP11 Shares into which the PSP11
Series B and C Shares and AOPP Shares evidenced thereby were converted.
However, until such outstanding certificates formerly evidencing PSP11 Series B
and C Shares and AOPP Shares are so surrendered, no dividend payable to holders
of record of PSP11 Shares shall be paid to the holders of such outstanding
certificates in respect of PSP11 Series B and C Shares and AOPP Shares, but upon
surrender of such certificates by such holders there shall be paid to such
holders the amount of any dividends (without interest) theretofore paid with
respect to such whole PSP11 Shares as of any record date on or subsequent to the
Effective Time and the amount of any cash (without interest) payable to such
holder in lieu of fractional share interests.

        2.6  Transfer of Shares.  After the Effective Time, there shall be no
further registration of transfers of PSP11 Series B and C Shares and AOPP Shares
on the corporate records and, if certificates formerly evidencing such shares
are presented to the Surviving Corporation, they shall be cancelled and
exchanged for certificates evidencing PSP11 Shares and cash in lieu of
fractional share interests as herein provided.

        2.7  No Fractional Shares.  Notwithstanding any other term or provision
of this Agreement or the Plan, no fractional PSP11 Shares and no certificates or
script therefor, or other evidence of ownership thereof, will be issued in the
Merger.  In lieu of any such fractional share interests, each holder of AOPP
Shares or of PSP11 Series B and C Shares who would otherwise be entitled to such
fractional share will, upon surrender of the certificate representing such
shares, receive a whole PSP11 Share if such fractional share to which such
holder would otherwise have been entitled is .5 of a PSP11 Share or more, and
such fractional share shall be disregarded if it represents less than .5 of a
PSP11 Share; provided, however, that, such fractional share shall not be
disregarded if such fractional share to which such holder would otherwise have
been entitled represents .5 of 1% or more of the total number of PSP11 Shares
such holder is entitled to receive in the Merger.  In such event, such holder
shall be paid an amount in cash (without interest), rounded to the nearest $.01,
determined by multiplying (i) the per share closing price on the American Stock
Exchange, Inc. of the PSP11 Shares at the Effective Time by (ii) the fractional
interest.

                                      A-3
<PAGE>
 
        2.8  Dissenting Shares.  PSP11 Shares, PSP11 Series B and C Shares and
AOPP Shares held by a holder who has demanded and perfected his right to an
appraisal of such shares in accordance with Section 1300 et seq. of the General
Corporation Law of California (the "GCLC") and who has not effectively withdrawn
or lost his right to appraisal ("Dissenting Shares") shall not continue to be
owned by the holder thereof or converted into or represent the right to receive
cash and/or PSP11 Shares, but the holder thereof shall be entitled only to such
rights as are granted by Section 1300 et seq. of the GCLC.  Each holder of
Dissenting Shares who becomes entitled to payment for PSP11 Shares, PSP11 Series
B and C Shares or AOPP Shares pursuant to these provisions of the GCLC shall
receive payment therefor from the Surviving Corporation in accordance therewith.
If any holder of PSP11 Shares, PSP11 Series B and C Shares or AOPP Shares who
demands appraisal in accordance with Section 1300 et seq. of the GCLC shall
effectively withdraw with the consent of the Surviving Corporation or lose
(through failure to perfect or otherwise) his right to appraisal with respect to
PSP11 Shares, PSP11 Series B and C Shares or AOPP Shares, such shares shall
automatically be converted into the right to receive PSP11 Shares pursuant to
Section 2.1(b), 2.2(b) or 2.3(b) hereof, as the case may be.

        2.9  Assumption of AOPP Options. At the Effective Time, each outstanding
option to purchase AOPP Shares (an "AOPP Option") granted under AOPP's 1997
Stock Option and Incentive Plan (the "AOPP Plan") shall be assumed by PSP11 and,
whether vested or unvested, shall be converted into, and shall be deemed to
constitute, an option to acquire, on the same terms and conditions applicable to
the AOPP Option, the number of shares of PSP11 Shares that the holder of the
AOPP Option would have received in the Merger if the AOPP Option had been
exercised in full immediately prior to the Effective Time, irrespective of
whether the AOPP Option was in fact then exercisable (a "Converted Option"). The
exercise price per share of a Converted Option shall be the aggregate exercise
price of the AOPP Option divided by the number of PSP11 Shares purchasable upon
exercise of the Converted Option. As soon as practicable after the Effective
Time, PSP11 shall deliver to each holder of an AOPP Option an appropriate notice
setting forth the holder's rights pursuant thereto. PSP11 shall comply with the
terms of each AOPP Option and take all corporate action necessary to reserve for
issuance a sufficient number of PSP11 Shares for delivery upon exercise of the
Converted Options.

                                  ARTICLE III

        3.1  Headings.  The descriptive headings contained in the Sections of
this Agreement are for convenience of reference only and shall not affect in any
way the meaning or interpretation of this Agreement.

        3.2  Parties in Interest.  This Agreement, and the rights, interests and
obligations created by this Agreement, shall bind and inure to the benefit of
the parties and their respective successors and permitted assigns, and shall
confer no right, benefit or interest upon any other person, including
shareholders of the respective parties.

        3.3  Counterparts.  This Agreement may be executed in two or more
counterparts, each of which shall be deemed to be an original, but all of which
shall be considered one and the same agreement.

        3.4  Further Action.  If at any time after the Effective Time, the
Surviving Corporation shall determine that any assignments, transfers, deeds or
other assurances are necessary or desirable to vest, perfect or confirm, of
record or otherwise, in the Surviving Corporation, title to any property or
rights of AOPP, the officers of either Constituent Corporation are fully
authorized in the name of AOPP or otherwise to execute and deliver such
documents and do all things necessary and proper to vest, perfect or confirm
title to such property or rights in the Surviving Corporation.

                                      A-4
<PAGE>
 
        3.5  Governing Law.  This Agreement shall be governed by and construed
in accordance with the laws of the State of California, without giving effect to
the principles of conflict of laws thereof.

        3.6  Abandonment of Merger.  The Constituent Corporations have the power
to abandon the Merger by mutual written consent prior to the filing of this
Agreement with the California Secretary of State.

        IN WITNESS WHEREOF, the parties have entered into this Agreement as of
the date first above written.

                              PUBLIC STORAGE PROPERTIES XI, INC.



                              By: _________________________________
                                   B. Wayne Hughes
                                   Chairman of the Board of Directors and Chief
                                   Executive Officer



                              By: _________________________________
                                   Obren B. Gerich
                                   Secretary

                              AMERICAN OFFICE PARK PROPERTIES, INC.



                              By: _________________________________
                                   Ronald L. Havner, Jr.
                                   Chief Executive Officer


                              By: _________________________________
                                   Mary Jayne Howard
                                   Assistant Secretary

                                      A-5


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