IDS SHURGARD INCOME GROWTH PARTNERS L P III
SC 14D1/A, 1996-08-26
PUBLIC WAREHOUSING & STORAGE
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<PAGE>
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                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                SCHEDULE 14D-1/A
 
              TENDER OFFER STATEMENT PURSUANT TO SECTION 14(D)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
 
                               (AMENDMENT NO. 8)
 
                               ------------------
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
                           (Name of Subject Company)
 
                            ------------------------
 
                         SHURGARD STORAGE CENTERS, INC.
 
                                    (Bidder)
 
                           LIMITED PARTNERSHIP UNITS
                         (Title of Class of Securities)
 
                            ------------------------
 
                                   448933-200
                     (CUSIP Number of Class of Securities)
 
                            ------------------------
 
                             KRISTIN H. STRED, ESQ.
              SENIOR VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                         SHURGARD STORAGE CENTERS, INC.
                               1201 THIRD AVENUE
                                   SUITE 2200
                           SEATTLE, WASHINGTON 98101
                                 (206) 624-8100
 
            (Name, Address and Telephone Number of Person Authorized
           to Receive Notices and Communications on Behalf of Bidder)
 
                                   COPIES TO:
 
                             JEFFERY T. PERO, ESQ.
                            WILLIAM J. CERNIUS, ESQ.
                                LATHAM & WATKINS
                             650 TOWN CENTER DRIVE
                                TWENTIETH FLOOR
                          COSTA MESA, CALIFORNIA 92626
                                 (714) 540-1235
 
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<PAGE>
                                     14D-1
 
<TABLE>
<CAPTION>
    CUSIP NO.
<S>                <C>                                                                                 <C>
            1      NAME OF REPORTING PERSON AND S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                   SHURGARD STORAGE CENTERS, INC. (91-1603837)
            2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                    (a) / /
                                                                                                       (b) / /
            3      SEC USE ONLY
            4      SOURCES OF FUNDS
                   BK
            5      CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR      / /
                   2(f)
            6      CITIZENSHIP OR PLACE OF ORGANIZATION
                   DELAWARE
            7      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                   APPROXIMATELY 1,603 UNITS
            8      CHECK IF THE AGGREGATE AMOUNT IN ROW (7) EXCLUDES CERTAIN SHARES                    / /
            9      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7) APPROXIMATELY 1.3%
           10      TYPE OF REPORTING PERSON -- CO
</TABLE>
 
<PAGE>
    This  Amendment No. 8 to  the Tender Offer Statement  on Schedule 14D-1 (the
"Schedule 14D-1") relates to a tender offer by Shurgard Storage Centers, Inc., a
Delaware corporation  (the  "Purchaser"), to  purchase  up to  52,000  units  of
limited  partnership  interest  (the  "Units") in  IDS/  Shurgard  Income Growth
Partners, L.P. III,  a Washington  limited partnership  (the "Partnership"),  at
$308 per Unit, net to the seller in cash and without interest, upon the terms of
and  subject to the conditions set forth in  the Offer to Purchase dated July 2,
1996, as supplemented by  the Purchaser's Letter to  Unitholders dated July  16,
1996  and  the  Supplement to  Offer  to  Purchase dated  August  26,  1996 (the
"Supplement to  Offer to  Purchase"), a  copy  of which  is attached  hereto  as
Exhibit  99.19,  and  in  the  related  Letter  of  Transmittal  (which together
constitute the "Offer"). This Amendment No. 8 is being filed by the Purchaser.
 
                                       3
<PAGE>
ITEM 1.  ISSUER AND CLASS OF SECURITY SUBJECT TO THE TRANSACTION.
 
    Item 1 is hereby amended to add the following additional information:
 
    (c) The information set forth in "MARKET PRICES OF UNITS" of the  Supplement
to the Offer to Purchase is incorporated herein by reference.
 
    (d)  The information  set forth  in SCHEDULE VIII  of the  Supplement to the
Offer to Purchase is incorporated herein by reference.
 
ITEM 2.  IDENTITY AND BACKGROUND.
 
    Item 2 is hereby amended to add the following additional information:
 
    (d) The information set forth  in SCHEDULE I of  the Supplement to Offer  to
Purchase is incorporated herein by reference.
 
ITEM 3.  PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS WITH THE SUBJECT COMPANY.
 
    Item 3 is hereby amended to add the following additional information:
 
    (a)-(b)  The information  set forth  on the Cover  Page and  in the SUMMARY,
"SPECIAL  CONSIDERATIONS,"  "BACKGROUND  AND  PURPOSES  OF  THE  TRANSACTION  --
Background  of  the  Transaction"  and "INTERESTS  OF  CERTAIN  PERSONS"  of the
Supplement to Offer to Purchase is incorporated herein by reference.
 
ITEM 5.  PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE BIDDER.
 
    Item 5 is hereby amended to add the following additional information:
 
    (a)-(g) The information set forth on  the Cover Page and in "BACKGROUND  AND
PURPOSES  OF  THE  TRANSACTION"  of  the  Supplement  to  Offer  to  Purchase is
incorporated herein by reference.
 
ITEM 7.  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS  OR RELATIONSHIPS WITH  RESPECT
         TO THE SUBJECT COMPANY'S SECURITIES.
 
    Item 7 is hereby amended to add the following information:
 
    The  information set forth in "BACKGROUND AND PURPOSES OF THE TRANSACTION --
Background of the Transaction" is incorporated herein by reference.
 
ITEM 9.  FINANCIAL STATEMENTS OF CERTAIN BIDDERS.
 
    Item 9 is hereby amended to add the following additional information:
 
    The information set forth in "BACKGROUND AND PURPOSES OF THE TRANSACTION  --
The  Purchaser" and SCHEDULE VII  of the Supplement to  the Offer to Purchase is
incorporated herein by reference.
 
ITEM 10.  ADDITIONAL INFORMATION.
 
    Item 10 is hereby amended to add the following additional information:
 
    (a) The information set forth  in the SUMMARY, "SPECIAL CONSIDERATIONS"  and
"INTERESTS  OF  CERTAIN  PERSONS" of  the  Supplement  to Offer  to  Purchase is
incorporated herein by reference.
 
    (e) The information set forth in "THE OFFER -- Section 11" ("Miscellaneous")
is incorporated herein by reference.
 
    (f) The information set forth in the Supplement to Offer to Purchase, a copy
of which  is  attached  hereto  as Exhibit  99.19,  is  incorporated  herein  by
reference.
 
                                       4
<PAGE>
ITEM 11.  MATERIAL TO BE FILED AS EXHIBITS.
 
    Item 11 is hereby amended to add the following additional information:
 
<TABLE>
<S>        <C>
99.19      Supplement to Offer to Purchase dated August 26, 1996.
99.20      Letter to Unitholders dated August 26, 1996.
99.21      Text of Press Release dated August 26, 1996.
</TABLE>
 
    After due inquiry and to the best of my knowledge and belief, I certify that
the information set forth in this statement is true, complete and correct.
 
Dated: August 26, 1996
                                          SHURGARD STORAGE CENTERS, INC.
 
                                          By: /s/ HARRELL L. BECK
 
                                             -----------------------------------
                                              Name: Harrell L. Beck
                                              Title: Senior Vice President,
                                             Chief
                                                  Financial Officer and
                                             Treasurer
 
                                       5

<PAGE>
                                 SUPPLEMENT TO
                           OFFER TO PURCHASE FOR CASH
               UP TO 52,000 UNITS OF LIMITED PARTNERSHIP INTEREST
                                       OF
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
                                       AT
                               $308 NET PER UNIT
                                       BY
                         SHURGARD STORAGE CENTERS, INC.
 
THE  OFFER, PRORATION PERIOD AND WITHDRAWAL RIGHTS WILL EXPIRE AT 6:00 P.M., NEW
YORK CITY TIME, ON MONDAY, SEPTEMBER 9, 1996, UNLESS EXTENDED.
                            ------------------------
 
    SHURGARD STORAGE CENTERS, INC. (THE "PURCHASER") IS OFFERING TO PURCHASE  UP
TO  52,000 UNITS OF  LIMITED PARTNERSHIP INTEREST  (THE "UNITS") IN IDS/SHURGARD
INCOME GROWTH PARTNERS L.P. III (THE "PARTNERSHIP") AT A NET CASH PRICE PER UNIT
OF $308 (THE "OFFER PRICE"). THIS OFFER IS NOT CONDITIONED UPON A MINIMUM NUMBER
OF UNITS  BEING  VALIDLY  TENDERED, BUT  IT  IS  SUBJECT TO  CERTAIN  TERMS  AND
CONDITIONS  DESCRIBED IN  THE OFFER  TO PURCHASE. SEE  "THE OFFER"  -- SECTION 7
("CERTAIN CONDITIONS OF THE  OFFER"). IF MORE  THAN 52,000 UNITS  (APPROXIMATELY
44%  OF THE OUTSTANDING  UNITS) ARE VALIDLY TENDERED,  THE PURCHASER WILL ACCEPT
ONLY 52,000 UNITS AND  WILL PURCHASE UNITS FROM  TENDERING UNITHOLDERS ON A  PRO
RATA BASIS AS DESCRIBED IN THE OFFER TO PURCHASE.
 
    Following  the completion of  the purchase of Units  pursuant to this Offer,
the remaining Unitholders will be notified  of a special meeting of  Unitholders
(the  "Special Meeting") to  be held to  consider and vote  upon approval of the
merger of the  Partnership with and  into the Purchaser  (the "Merger"). If  the
Merger  is approved by the  requisite vote of the  Unitholders and certain other
conditions to the Merger are satisfied or waived, (i) the Partnership will merge
into the Purchaser and cease to exist  as a separate legal entity and (ii)  each
Unit,  other than Units held by the Purchaser (including Units purchased in this
Offer), which will  be cancelled,  and Units, if  any, held  by Unitholders  who
perfect  dissenters' rights, will be converted into the right to receive between
11.10 and 13.84 shares of Class A Common Stock of the Purchaser ("REIT Shares"),
depending upon the  average closing price  of the  REIT Shares on  the New  York
Stock Exchange during a designated period prior to the Special Meeting. All REIT
Shares will be aggregated for each Unitholder and cash will be issued in lieu of
any  fractional REIT Shares. If the average  closing price used to determine the
number of REIT Shares issuable in the Merger is less than $21.50 per REIT Share,
the Purchaser may  provide additional cash  consideration. See "The  Acquisition
Agreement."
 
    In  evaluating the matters described herein, Unitholders should consider the
following, among other factors:
 
    - The general partner of the Partnership, the Purchaser and their affiliates
      have significant conflicts of interest  in connection with this Offer  and
      the   Merger,  and  no  unaffiliated  representatives  were  appointed  to
      negotiate the  terms  of  this Offer  and  the  Merger on  behalf  of  the
      Partnership. The conflicts of interest arise, among other things, from the
      fact that certain representatives of the general partner are also officers
      of the Purchaser. See "Special Considerations."
 
    - As  a result of this Offer, the Purchaser  may hold the largest, or one of
      the largest, equity positions in the Partnership, and therefore may be  in
      a  position to influence  the policies and affairs  of the Partnership and
      the vote on approval of the Merger. See "Special Considerations."
 
    - If the average  price of  REIT Shares for  the designated  period used  to
      determine  the number of REIT  Shares issuable in the  Merger is less than
      $22.25 per share  or if the  market price of  REIT Shares decreases  after
      determination  of the number of REIT Shares to be issued in the Merger and
      prior to the issuance of REIT Shares, the market value of the REIT  Shares
      received  in the Merger  may be lower  than the Offer  Price. See "Special
      Considerations."
 
                                                        (CONTINUED ON NEXT PAGE)
                            ------------------------
 
    THIS TRANSACTION HAS NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES  AND
EXCHANGE  COMMISSION (THE "COMMISSION")  NOR HAS THE  COMMISSION PASSED UPON THE
FAIRNESS OR MERITS OF THIS TRANSACTION OR  UPON THE ACCURACY OR ADEQUACY OF  THE
INFORMATION  CONTAINED IN THIS  DOCUMENT. ANY REPRESENTATION  TO THE CONTRARY IS
UNLAWFUL.
 
August 26, 1996
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    - The Merger, if consummated, may affect the level of distributions made  to
      Unitholders  who become stockholders of  the Purchaser, with the potential
      that, depending upon the number of REIT Shares issued in the Merger,  some
      Unitholders  may receive  following the Merger  smaller distributions than
      they would have received if the  Merger had not been consummated and  they
      had  remained Unitholders. See  "Fairness of the  Transaction; Position of
      the General Partner."
 
    - Certain valuations  of  the  Partnerships  (as defined  in  the  Offer  to
      Purchase)  performed by Alex. Brown were above the aggregate consideration
      to be  issued in  the  Transaction and  Additional Transactions  (each  as
      defined   in  the  Offer  to  Purchase)  while  other  valuations  of  the
      Partnerships  that  Alex.  Brown   performed  were  below  the   aggregate
      consideration to be issued in the Transaction and Additional Transactions.
      In  particular, the valuation of the Partnerships Alex. Brown performed in
      its analysis of publicly-traded REITs resulted in a higher valuation  than
      the   consideration  to  be  issued  in  the  Transaction  and  Additional
      Transactions, whereas the  valuation of the  Partnerships it performed  in
      its  analysis of  selected real  estate acquisitions  resulted in  a lower
      valuation than the consideration to be  issued in the Transaction and  the
      Additional Transactions. See "Appraisal; Opinions of Financial Advisors --
      Opinion of the Purchaser's Financial Advisor."
 
    THE  GENERAL PARTNER OF THE PARTNERSHIP IS SHURGARD ASSOCIATES L.P. III (THE
"GENERAL PARTNER"). THE GENERAL PARTNER HAS  APPROVED THIS OFFER AND THE  MERGER
AND  HAS DETERMINED THAT THE TERMS OF THIS  OFFER AND THE MERGER ARE FAIR TO THE
UNITHOLDERS. THE GENERAL  PARTNER RECOMMENDS THAT  THOSE UNITHOLDERS WHO  DESIRE
IMMEDIATE LIQUIDITY TENDER THEIR UNITS PURSUANT TO THIS OFFER AND THAT ALL OTHER
UNITHOLDERS  RETAIN THEIR UNITS  AND, INSTEAD, PARTICIPATE  IN THE MERGER. THERE
CAN BE NO ASSURANCE, HOWEVER, THAT THE MERGER WILL BE CONSUMMATED.
 
                            ------------------------
 
                                   IMPORTANT
 
    Any Unitholder desiring to  tender all or  any portion of  his or her  Units
should  complete  and sign  the  Letter of  Transmittal  in accordance  with the
instructions in the Letter of Transmittal, and mail or deliver it with any other
required documents to the Depositary at the address set forth on the back  cover
of the Offer to Purchase.
 
    Questions  and requests for assistance or  additional copies of the Offer to
Purchase, the Letter of Transmittal and  this Supplement may be directed to  the
Information  Agent at  its address  and telephone number  set forth  on the back
cover of the Offer to Purchase.  Unitholders may also contact brokers,  dealers,
commercial banks and trust companies for assistance concerning this Offer.
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
Introduction...............................................................................................           1
Incorporation of Certain Documents By Reference............................................................           1
Cautionary Statement.......................................................................................           1
Summary....................................................................................................           1
Special Considerations.....................................................................................           2
Background and Purposes of the Transaction.................................................................           4
Fairness of the Transaction; Position of the General Partner...............................................          10
Appraisal; Opinions of Financial Advisors..................................................................          15
Market Prices of Units.....................................................................................          18
Interests of Certain Persons...............................................................................          18
The Offer..................................................................................................          19
</TABLE>
 
<TABLE>
<S>            <C>        <C>
Schedule I        --      Directors and Executive Officers of Shurgard Storage Centers, Inc.,
                          Shurgard General Partner, Inc. and the Individual General Partners of
                          Shurgard Associates L.P. III
 
Schedule V        --      Consolidated Financial Statements of IDS/Shurgard Income Growth Partners
                          L.P. III
 
Schedule VI       --      Management's Discussion and Analysis of Financial Condition and Results
                          of Operations of the Partnership
 
Schedule VII      --      Pro Forma Consolidated Financial Statements
 
Schedule VIII     --      Partnership Distributions
 
Schedule IX       --      Property Information
</TABLE>
 
                                       i
<PAGE>
                                  INTRODUCTION
 
    The Purchaser hereby amends and supplements the Offer to Purchase dated July
2, 1996, as supplemented by the Purchaser's letter to Unitholders dated July 16,
1996  (the "Offer  to Purchase").  Except as set  forth in  this Supplement, the
Offer continues to  be governed by  the terms  and conditions set  forth in  the
Offer  to Purchase  and the related  Letter of Transmittal,  and the information
contained therein continues to be  important to each Unitholder's decision  with
respect  to the Offer. Accordingly, this  Supplement should be carefully read in
conjunction with the Offer  to Purchase and the  related Letter of  Transmittal,
which  have been previously mailed to Unitholders. Capitalized terms not defined
herein have the meanings set forth in the Offer to Purchase.
 
    Procedures for tendering Units  are set forth in  the Section entitled  "The
Offer"  of the Offer  to Purchase. Tendering Unitholders  should continue to use
the Letter of Transmittal  circulated with the Offer  to Purchase. By  tendering
Units, Unitholders assign to the Purchaser all rights to cash distributions made
subsequent to July 2, 1996 with respect to those Units.
 
    UNITHOLDERS  WHO HAVE VALIDLY TENDERED UNITS AND NOT WITHDRAWN THEIR TENDERS
NEED TAKE NO FURTHER ACTION TO VALIDLY TENDER THOSE UNITS.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    THE FIRST  PARAGRAPH  OF  THE SECTION  ENTITLED  "INCORPORATION  OF  CERTAIN
DOCUMENTS  BY  REFERENCE" IS  HEREBY  AMENDED AND  RESTATED  IN ITS  ENTIRETY AS
FOLLOWS:
 
    The following documents filed with the Commission by the Purchaser (File No.
0-23466) are incorporated by reference in this Offer to Purchase:
 
        (i) the  Purchaser's Quarterly  Reports on  Form 10-Q  for the  quarters
    ended March 31, 1996 and June 30, 1996;
 
        (ii)  the  Purchaser's Annual  Report on  Form 10-K  for the  year ended
    December 31, 1995;
 
       (iii)  the  Purchaser's  Proxy  Statement  for  1996  Annual  Meeting  of
    Stockholders;
 
       (iv)  the description of the Purchaser's  Class A Common Stock, par value
    $.001 per share, contained in the Purchaser's Registration Statement on Form
    8-A, as amended, dated April 19, 1995; and
 
        (v) the description of the Preferred Share Purchase Rights contained  in
    the  Purchaser's Registration Statement on Form 8-A, as amended, dated April
    19, 1995.
 
                              CAUTIONARY STATEMENT
 
    THE SECTION ENTITLED "CAUTIONARY STATEMENT" IS HEREBY DELETED.
 
                                    SUMMARY
 
    THE SECTION ENTITLED "SUMMARY  -- CONFLICTS OF  INTEREST" IS HEREBY  AMENDED
AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
CONFLICTS OF INTEREST
 
    The General Partner of the Partnership has substantial conflicts of interest
in  the Transaction  because (i)  Charles K. Barbo,  the Chairman  of the Board,
President and Chief Executive Officer and a stockholder of the Purchaser, is  an
individual  general partner of the General  Partner and the sole shareholder and
director of the corporate general partner of the General Partner, (ii) Arthur W.
Buerk, a stockholder of the Purchaser,  is an individual general partner of  the
General Partner, (iii) certain executive officers of the Purchaser are executive
officers  of the corporate general partner of the General Partner, (iv) pursuant
to the terms  of the  Partnership's Amended  and Restated  Agreement of  Limited
Partnership (the "Partnership Agreement"), the General Partner will receive 7.5%
of the
 
                                       1
<PAGE>
Merger   Consideration  in  exchange  for  its  general  partner  interest  ("GP
Interest") in the Partnership and (v) the Purchaser is a limited partner of  the
General  Partner  and  manages  the  Partnership's  properties  pursuant  to the
Management Services Agreement  between the  Purchaser and  the Partnership  (the
"Management  Services Agreement").  In addition,  pursuant to  the terms  of the
Contingent Share Agreement (as defined in "Fairness of the Transaction; Position
of the General Partner -- Factors Considered by the General Partner --  Fairness
in  View of Conflicts of Interest"), assuming the REIT Share Price is within the
Share Price  Range, Charles  K. Barbo,  Arthur W.  Buerk and  certain  executive
officers of the Purchaser will receive REIT Shares in connection with the Merger
with  a value of  $301,900, $183,700 and  $37,300, respectively. See "Background
and Purposes  of the  Transaction --  Relationships" and  "Interests of  Certain
Persons."
 
    Under  the Partnership Agreement and  related Management Services Agreement,
the Partnership  currently  pays compensation,  fees  and distributions  to  the
General  Partner  and  its  affiliates.  Specifically,  the  General  Partner is
entitled to  receive 5%  of the  Partnership's cash  distributions, profits  and
losses  and the  percentage increases  to 20%  once Unitholders  have received a
specified return  on their  capital contributions  to the  Partnership. For  the
years  ended December 31, 1993, 1994 and 1995  and the six months ended June 30,
1996, the General Partner received distributions of $96,077, $111,764,  $117,648
and $58,824, respectively. The General Partner will receive, in exchange for its
general  partner  interest  in  the  Partnership,  a  percentage  of  the Merger
Consideration determined in accordance with  the distribution provisions of  the
Partnership  Agreement (See "Interests  of Certain Persons  -- General Partner's
Interest") which, assuming the REIT Share Price is within the Share Price Range,
results in the General Partner receiving REIT Shares with an aggregate value  of
$2,961,000,  of which Charles K.  Barbo and Arthur W.  Buerk will be entitled to
REIT Shares with a value of $200,300 and $196,300, respectively. As the property
manager, the Purchaser is entitled to receive 6% of gross revenues received from
operations of the Partnership's self storage properties and 5% of gross revenues
of the Partnership's office building, plus a monthly advertising fee of $75  per
property  (except the Partnership's  office building), as  well as reimbursement
for  certain  out-of-pocket   expenses  incurred  in   the  management  of   the
Partnership's  assets. For the years ended December  31, 1993, 1994 and 1995 and
the six months ended June 30,  1996, the Purchaser received property  management
and  advertising  fees  totaling  $256,850,  $407,784,  $447,716  and  $226,650,
respectively. In addition, the Purchaser  was reimbursed by the Partnership  for
certain  expenses it incurred as property manager. An affiliate of IPSC received
from the Purchaser a quarterly fee  of $12,000 for each quarter commencing  July
1,  1994 and ending  June 30, 1996  as reimbursement for  expenses in connection
with the rendering of certain  administrative services. The IPSC affiliate  will
be  reimbursed by  the Purchaser  for expenses  incurred in  connection with the
provision of certain  administrative services with  respect to the  Transaction,
which  the IPSC affiliate does  not expect to exceed  $50,000. See "Interests of
Certain Persons -- Payments for Administrative Services."
 
    If the Merger is consummated, all of  the assets of the Partnership will  be
acquired  by the Purchaser and, because  the Purchaser is self-administered, the
acquired assets will be  managed by employees of  the Purchaser and the  General
Partner  and its affiliates  will receive no  property management or advertising
fees. The  General  Partner and  its  affiliates  will be  entitled  to  receive
dividends  on the REIT Shares they each receive as a result of the Merger on the
same basis as all other stockholders of the Purchaser.
 
                             SPECIAL CONSIDERATIONS
 
    THE SECTION ENTITLED  "SPECIAL CONSIDERATIONS --  CONFLICTS OF INTEREST"  IS
HEREBY RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    CONFLICTS  OF INTEREST.   The General  Partner has  substantial conflicts of
interest with  respect to  the Transaction  because (i)  Charles K.  Barbo,  the
Chairman  of the Board, President and  Chief Executive Officer and a stockholder
of the Purchaser, is  an individual general partner  of the General Partner  and
the  sole  shareholder and  director  of the  corporate  general partner  of the
General Partner, (ii)  Arthur W. Buerk,  a stockholder of  the Purchaser, is  an
individual general partner of the General
 
                                       2
<PAGE>
Partner,  (iii)  certain  executive  officers  of  the  Purchaser  are executive
officers of  the corporate  general partner  of the  General Partner,  (iv)  the
General Partner will be entitled to 7.5% of the Merger Consideration pursuant to
the  terms  of the  Partnership Agreement  and  (v) the  Purchaser is  a limited
partner of the General Partner and  the manager of the Partnership's  properties
pursuant  to the  Management Services  Agreement. In  addition, pursuant  to the
terms of the Contingent Share Agreement, assuming the REIT Share Price is within
the Share Price Range, Charles K.  Barbo, Arthur W. Buerk and certain  executive
officers of the Purchaser will receive REIT Shares in connection with the Merger
with  a  value  of  $301,900, $183,700  and  $37,300,  respectively.  As general
partners of the General Partner, Messrs. Barbo and Buerk control the  day-to-day
affairs  of the  Partnership. See  "Interests of  Certain Persons."  For certain
limitations on the authority of the  general partners of the General Partner  to
enter  into the  Acquisition Agreement, see  "The Acquisition  Agreement -- IPSC
Consent."
 
    Under the Partnership Agreement  and related Management Services  Agreement,
the  Partnership  currently pays  compensation,  fees and  distributions  to the
General Partner  and  its  affiliates.  Specifically,  the  General  Partner  is
entitled  to receive  5% of  the Partnership's  cash distributions,  profits and
losses and the  percentage increases  to 20%  once Unitholders  have received  a
specified  return on  their capital  contributions to  the Partnership.  For the
years ended December 31, 1993, 1994 and  1995 and the six months ended June  30,
1996,  the General Partner received distributions of $96,077, $111,764, $117,648
and $58,824, respectively. The General Partner will receive, in exchange for its
general partner  interest  in  the  Partnership,  a  percentage  of  the  Merger
Consideration  determined in accordance with  the distribution provisions of the
Partnership Agreement (See  "Interests of Certain  Persons -- General  Partner's
Interest") which, assuming the REIT Share Price is within the Share Price Range,
results  in the General Partner receiving REIT Shares with an aggregate value of
$2,961,000, of which Charles K.  Barbo and Arthur W.  Buerk will be entitled  to
REIT Shares with a value of $200,300 and $196,300, respectively. As the property
manager, the Purchaser is entitled to receive 6% of gross revenues received from
operations of the Partnership's self storage properties and 5% of gross revenues
of  the Partnership's office building, plus a monthly advertising fee of $75 per
property (except the  Partnership's office building),  as well as  reimbursement
for   certain  out-of-pocket  expenses   incurred  in  the   management  of  the
Partnership's assets. For the years ended  December 31, 1993, 1994 and 1995  and
the  six months ended June 30,  1996, the Purchaser received property management
and  advertising  fees  totaling  $256,850,  $407,784,  $447,716  and  $226,650,
respectively.  In addition, the Purchaser was  reimbursed by the Partnership for
certain expenses it incurred as property manager. An affiliate of IPSC  received
from  the Purchaser a quarterly fee of  $12,000 for each quarter commencing July
1, 1994 and  ending June 30,  1996 as reimbursement  for expenses in  connection
with  the rendering of certain administrative  services. The IPSC affiliate will
be reimbursed by  the Purchaser  for expenses  incurred in  connection with  the
provision  of certain administrative  services with respect  to the Transaction,
which the IPSC affiliate  does not expect to  exceed $50,000. See "Interests  of
Certain Persons -- Payments for Administrative Services."
 
    If  the Merger is consummated, all of  the assets of the Partnership will be
acquired by the Purchaser and,  because the Purchaser is self-administered,  the
acquired  assets will be managed  by employees of the  Purchaser and the General
Partner and its affiliates  will receive no  property management or  advertising
fees.  The  General  Partner and  its  affiliates  will be  entitled  to receive
dividends on the REIT Shares they each receive as a result of the Merger on  the
same basis as all other stockholders of the Purchaser.
 
    THE SECTION ENTITLED "SPECIAL CONSIDERATIONS -- INVESTMENT OBJECTIVES OF THE
PURCHASER" IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    INVESTMENT  OBJECTIVES OF THE PURCHASER.  The Purchaser is making this Offer
with a view to further expanding its portfolio of self storage properties. There
is a conflict between  the desire of  the Purchaser to purchase  Units at a  low
price   and  the  desire   of  the  Unitholders   to  sell  their   Units  at  a
 
                                       3
<PAGE>
high price. The Offer Price was determined based upon the Net Asset Value of the
Partnership, which  Net Asset  Value  was, in  turn,  based primarily  upon  the
independently appraised values of the Partnership's real estate portfolio.
 
                   BACKGROUND AND PURPOSES OF THE TRANSACTION
 
    THE  SECTION ENTITLED  "BACKGROUND AND  PURPOSES OF  THE TRANSACTION  -- THE
PARTNERSHIP" IS HEREBY  AMENDED BY  ADDING THE  FOLLOWING PARAGRAPH  IMMEDIATELY
AFTER THE THIRD PARAGRAPH OF THAT SECTION:
 
    The  General Partner  of the Partnership  is a limited  partnership of which
Charles K.  Barbo,  Arthur W.  Buerk  and SGPI  are  the general  partners.  The
business   address,  current  principal   occupation  or  employment,  five-year
employment history and  citizenship of Mr.  Barbo, Mr. Buerk  and the  executive
officers  and directors  of SGPI are  set forth in  Schedule I to  this Offer to
Purchase.
 
    THE SECTION  ENTITLED "BACKGROUND  AND PURPOSES  OF THE  TRANSACTION --  THE
PARTNERSHIP" IS HEREBY AMENDED BY REPLACING THE FIFTH PARAGRAPH AND THE TABLE IN
THAT SECTION WITH THE FOLLOWING:
 
    The  following sets forth certain  financial information for the Partnership
which is derived from  the historical financial  statements of the  Partnership.
The  unaudited financial data  for the six  months ended June  30, 1995 and 1996
include all adjustments  (consisting only of  normally recurring accruals)  that
the Partnership considers necessary for a fair presentation of operating results
for  those interim  periods. Results for  the unaudited interim  periods are not
necessarily indicative of results for the full year. This information should  be
read  in  conjunction  with  the Financial  Statements  of  the  Partnership and
Management's Discussion  and  Analysis of  Financial  Condition and  Results  of
Operations  of the Partnership included as  Schedules V and VI, respectively, to
this Supplement.
 
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS ENDED
                                                                  YEAR ENDED DECEMBER 31,             JUNE 30,
                                                              --------------------------------  --------------------
                                                                 1993       1994       1995       1995       1996
                                                              ----------  ---------  ---------  ---------  ---------
<S>                                                           <C>         <C>        <C>        <C>        <C>
                                                                       (IN THOUSANDS, EXCEPT PER UNIT DATA)
OPERATING DATA:
Rental revenue..............................................  $    4,110  $   6,609  $   7,225  $   3,510  $   3,673
Interest Income.............................................         230         57         36         13         15
Earnings....................................................       1,427      1,655      1,885        822        644
Earnings per Unit (1).......................................       11.37      13.19      15.02       6.55       5.13
Distributions to Unitholders................................       1,825      2,124      2,235      1,117      1,117
Distributions per Unit (1)..................................       15.31      17.81      18.75       9.37       9.37
OTHER DATA:
Cash flows provided by (used by):
  Operating activities......................................  $    2,388  $   3,108  $   3,445  $   1,805  $   1,929
  Investing activites.......................................     (16,148)      (876)      (147)       (37)      (195)
  Financing activities......................................       5,951     (2,353)    (3,227)    (1,653)    (1,714)
Funds from operations (2)...................................  $    2,277  $   3,126  $   3,342  $   1,593  $   1,707
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                     DECEMBER 31,
                                                                                 --------------------  JUNE 30,
                                                                                   1994       1995       1996
                                                                                 ---------  ---------  ---------
<S>                                                                              <C>        <C>        <C>
BALANCE SHEET DATA:
Total assets...................................................................  $  36,930  $  35,636  $  35,130
Note payable...................................................................     11,620     10,746     10,333
Partners' equity...............................................................     24,882     24,414     23,881
</TABLE>
 
- ------------------------
(1) Earnings per  Unit and  Distributions per  Unit are  based on  earnings  and
    distributions,  respectively, allocated to Unitholders divided by the number
    of Units outstanding during the period (approximately 119,215 Units for  all
    periods shown).
 
(2) Funds from operations ("FFO"), as promulgated by the National Association of
    Real  Estate Investment Trusts in  its March 1995 White  Paper on Funds from
    Operations, is defined as net
 
                                       4
<PAGE>
    income  (calculated  in  accordance   with  generally  accepted   accounting
    principles  ("GAAP")) excluding gains or  losses from debt restructuring and
    sales  of  real  estate,  plus  depreciation  of  rental  real  estate   and
    amortization  of intangible  assets exclusive  of deferred  financing costs,
    plus or minus  certain nonrecurring revenue  and expenses. Contributions  to
    FFO  from unconsolidated  entities in  which the  reporting entity  holds an
    active interest  are  to  be  reflected  in  FFO  on  the  same  basis.  The
    Partnership  believes FFO is  a meaningful disclosure  as industry investors
    use FFO as a supplemental measure to compare the operational performance  of
    equity  REITs. FFO is  not a substitute  for net cash  provided by operating
    activities or net income computed in accordance with GAAP, nor should it  be
    considered   an  alternative  indication   of  the  Partnership's  operating
    performance or liquidity.
 
    FFO for each of the periods presented is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                                         SIX MONTHS ENDED
                                                          YEAR ENDED DECEMBER 31,            JUNE 30,
                                                      -------------------------------  --------------------
(IN THOUSANDS)                                          1993       1994       1995       1995       1996
                                                      ---------  ---------  ---------  ---------  ---------
<S>                                                   <C>        <C>        <C>        <C>        <C>
Earnings............................................  $   1,427  $   1,655  $   1,885  $     822  $     644
Depreciation and amortization.......................        873      1,518      1,505        795        666
Deferred financing costs............................        (23)       (47)       (48)       (24)       (24)
Transaction costs...................................     --         --         --         --            421
                                                      ---------  ---------  ---------  ---------  ---------
  Funds from operations.............................  $   2,277  $   3,126  $   3,342  $   1,593  $   1,707
                                                      ---------  ---------  ---------  ---------  ---------
                                                      ---------  ---------  ---------  ---------  ---------
</TABLE>
 
    THE SECTION  ENTITLED "BACKGROUND  AND PURPOSES  OF THE  TRANSACTION --  THE
PURCHASER"  IS HEREBY AMENDED BY REPLACING THE  FIFTH PARAGRAPH AND THE TABLE IN
THAT SECTION WITH THE FOLLOWING:
 
    The following sets  forth selected  financial information  of the  Purchaser
which  is derived from  the historical consolidated  financial statements of the
Purchaser. Selected unaudited financial data for  the six months ended June  30,
1995  and 1996  include all adjustments  (consisting only  of normally recurring
accruals) that  the Purchaser  considers necessary  for a  fair presentation  of
consolidated  operating  results  for  those interim  periods.  Results  for the
interim periods are  not necessarily indicative  of results for  the full  year.
This information should be read in conjunction with the Purchaser's consolidated
financial  statements and other financial  information incorporated by reference
in the
 
                                       5
<PAGE>
Offer to Purchase. See "Incorporation by Reference." Certain pro forma financial
information with respect to the Offer, the Additional Offers, the Merger and the
Additional Mergers is set forth in Schedule VII to this Supplement.
 
<TABLE>
<CAPTION>
                                                                                          PURCHASER (2)
                                                   PREDECESSOR (1)      --------------------------------------------------
                                                ----------------------                             SIX MONTHS ENDED JUNE
                                                YEAR ENDED   JAN. 1 TO    YEAR ENDED DEC. 31,               30,
                                                 DEC. 31,    MARCH 1,   ------------------------  ------------------------
                                                   1993        1994        1994         1995         1995         1996
                                                -----------  ---------  -----------  -----------  -----------  -----------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                             <C>          <C>        <C>          <C>          <C>          <C>
OPERATING DATA:
Total revenue.................................     $72,346   $  12,368  $  66,921    $  96,771    $  45,475    $  51,142
Net income....................................      18,284      34,286     17,821       29,572       11,972       15,114
Net income per common share (3)...............       34.11       63.97       1.05         1.43          .66          .65
Dividends declared per common share (3).......       59.57      732.05       1.02         2.38(4)      1.36(5)       .47(6)
OTHER DATA:
Cash flows provided by (used by):
  Operating activities........................     $35,049   $   5,116  $  29,309    $  46,113    $  20,602    $  23,070
  Investing activities........................      (5,582 )    62,962       (115  )   (86,311  )   (60,699  )   (31,802  )
  Financing activities........................     (30,269 )      (589)    99,021       32,719       33,947        6,797
Funds from operations (7).....................      39,657       5,980     29,759       45,788       19,574       25,078
</TABLE>
 
<TABLE>
<CAPTION>
                                                                         DECEMBER 31,              JUNE 30,
                                                                    ----------------------  ----------------------
                                                                       1994        1995        1995        1996
                                                                    ----------  ----------  ----------  ----------
<S>                                                                 <C>         <C>         <C>         <C>
BALANCE SHEET DATA:
Total assets......................................................  $  494,590  $  610,394  $  585,901  $  631,562
Total borrowings..................................................     167,137     142,840     132,391     171,140
</TABLE>
 
- --------------------------
(1) The Predecessor information reflects the combination of the 17  partnerships
    included in the Consolidation.
 
(2) The Purchaser was inactive from January 1 through March 1, 1994.
 
(3)  Predecessor  "per  share"  information is  earnings  and  distributions per
    original $1,000 investment.  Distributions for  the period  from January  1,
    1994  to  March  1,  1994  include  the  liquidating  distributions  made in
    connection with the Consolidation.
 
(4) Includes the  special dividend of  $0.10 declared in  November 1995 and  the
    dividend  of $0.46  per share declared  in December 1995  based on financial
    results for the quarter ended December 31, 1995.
 
(5) Includes the dividend of $0.44 per  share declared in January 1995 based  on
    financial  results for the quarter ended  December 31, 1994, the dividend of
    $0.46 per share declared in  May 1995 for the  quarter ended March 31,  1995
    and  the dividend of $0.46 per share declared in May 1995 based on financial
    results for the quarter ended June 30, 1995.
 
(6) A dividend  of $0.47 per  share relating  to the financial  results for  the
    quarter ended March 31, 1996 was declared in April 1996.
 
(7)  FFO, as promulgated  by the National Association  of Real Estate Investment
    Trusts in its March 1995 White Paper on Funds from Operations, is defined as
    net income (calculated in  accordance with GAAP)  excluding gains or  losses
    from  debt  restructuring and  sales of  real  estate, plus  depreciation of
    rental real  estate  and  amortization of  intangible  assets  exclusive  of
    deferred   financing  costs.   Contributions  to   FFO  from  unconsolidated
    entitities in which the reporting entity holds an active interest are to  be
    reflected in FFO on the same basis. The Purchaser believes FFO is meaningful
    disclosure  as  industry  investors use  FFO  as a  supplemental  measure to
    compare the operational performance of equity REITs. FFO is not a substitute
    for net cash  provided by  operating activities  or net  income computed  in
    accordance  with GAAP, nor should it be considered an alternative indication
    of the Purchaser's operating performance or liquidity.
 
                                       6
<PAGE>
    FFO for each of the periods presented is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                                            PURCHASER
                                                 PREDECESSOR             -----------------------------------------------
                                          -------------------------                                   SIX MONTHS ENDED
                                          YEAR ENDED      JAN. 1 TO       YEAR ENDED DEC. 31,             JUNE 30,
                                           DEC. 31,       MARCH 1,       ----------------------      -------------------
(IN THOUSANDS)                               1993           1994           1994          1995          1995       1996
                                          ----------      ---------      --------      --------      --------   --------
<S>                                       <C>             <C>            <C>           <C>           <C>        <C>
Net income..............................  $ 18,284        $34,286        $ 17,821      $ 29,572      $ 11,992   $ 15,114
Depreciation and amortization...........    14,017          2,406          11,452        17,559         8,142     10,524
Deferred financing costs................       (55)            (9)           (694)       (1,120)         (560)      (560)
Nonrecurring items......................     7,411(1)     (30,703)(2)       1,180(3)       (223)(4)     --         --
                                          ----------      ---------      --------      --------      --------   --------
    Funds from operations...............  $ 39,657        $ 5,980        $ 29,759      $ 45,788      $ 19,574   $ 25,078
                                          ----------      ---------      --------      --------      --------   --------
                                          ----------      ---------      --------      --------      --------   --------
</TABLE>
 
    ----------------------------------
    (1)  Litigation, hostile takeover and consolidation expenses.
 
    (2)  Litigation, hostile takeover and consolidation expenses of $12,180 less
         $48,223 of  gain in  consolidation plus  incentive management  fees  of
         $5,340.
 
    (3)  Extraordinary loss on retirement of debt.
 
    (4)  Gain on condemnation.
 
    THE  THIRD PARAGRAPH OF THE SECTION ENTITLED "BACKGROUND AND PURPOSES OF THE
TRANSACTION -- BACKGROUND OF THE TRANSACTION" IS HEREBY AMENDED AND RESTATED  IN
ITS ENTIRETY AS FOLLOWS:
 
    In  the fall of  1994, the General  Partner and the  general partners of the
Other Partnerships (collectively, the "General Partners") began considering  the
termination  of the  Partnership and  the Other  Partnerships (collectively, the
"Partnerships") through an acquisition of the Partnerships by the Purchaser. The
representatives  of  the  General  Partners  who  considered  the  Partnerships'
termination  and the  acquisition of the  Partnerships' assets  by the Purchaser
were also  executive  officers of  the  Purchaser. The  representatives  of  the
General  Partners and the Purchaser recognized that an acquisition might require
the consent of IPSC under the terms of the partnership agreements of the General
Partners. Consequently, on September 22, 1994, a representative of the Purchaser
sent IPSC  a letter  discussing  potential advantages  and disadvantages  of  an
acquisition of the Partnerships by the Purchaser for the appraised values of the
Partnerships,  whereby the  limited partners  of the  Partnerships would receive
either cash or REIT Shares in exchange for their limited partnership  interests.
The  letter presented  preliminary analyses  of the  value of  the Partnership's
properties of $39.7 million to $43.8 million, resulting in a net asset value  of
$26.1  million to $30.1 million and a net  asset value per Unit of $219 to $252.
For purposes of  the letter, net  asset value was  comprised of the  sum of  the
Purchaser's  internal  valuation of  the Partnership's  properties and  the book
value  of  the  Partnership's  non-real  estate  assets  less  the  sum  of  the
Partnership's  liabilities and  estimated transaction  costs. The  analyses were
based upon the Partnership's 1994  budgeted net operating income adjusted  based
upon  the Partnership's actual performance  when compared against budget through
July 1994, capitalization rates ranging from 10.5% to 9.5% and selling costs  of
5%  of  property  value.  The  letter  invited  IPSC  to  contact  the Purchaser
concerning how or if IPSC and the  Purchaser might wish to proceed. At the  time
the  initial  letter  was sent  to  IPSC  in 1994,  the  Purchaser  and Shurgard
Incorporated, the manager of  the Purchaser at that  time, were negotiating  the
terms of the merger of Shurgard Incorporated into the Purchaser (the "Management
Company  Merger") which was completed in March 1995. Although representatives of
the  Purchaser   and   the   Partnerships  had   occasional   discussions   with
representatives  of IPSC concerning the business of the Partnerships during that
period, they  did not  pursue a  potential transaction  due to  the  Purchaser's
representatives' involvement in the Management Company Merger.
 
                                       7
<PAGE>
    THE  SECTION  ENTITLED  "BACKGROUND  AND  PURPOSES  OF  THE  TRANSACTION  --
BACKGROUND OF  THE  TRANSACTION"  IS  HEREBY AMENDED  BY  ADDING  THE  FOLLOWING
PARAGRAPHS IMMEDIATELY AFTER THE FIFTH PARAGRAPH OF THAT SECTION:
 
    The   letter  noted  the   following  benefits  of   a  merger:  Unitholders
participating in the merger would acquire stock in an infinite life entity  with
a  larger asset base, greater diversification, larger market capitalization than
all three Partnerships combined and the ability to grow through increasing  cash
flows  from  its existing  portfolio, as  well as  through new  investments; the
merger would permit Unitholders to exchange their illiquid Units for shares of a
publicly traded  entity which  they could  liquidate at  the time  of their  own
choosing;  the  merger  would  permit  Unitholders  to  take  advantage  of  the
then-current  market  for  REIT  securities  which  more  fully  reflected   the
underlying  net asset value of REITs (such as the Purchaser) with the ability to
grow; the  merger  would  permit  Unitholders to  benefit  from  the  increasing
strength  of the  self-storage industry over  the past several  years; while the
merger would  be  a taxable  event,  the  then-current tax  liability  would  be
minimal,  but  would increase  the longer  the merger  was delayed,  assuming no
change in  other  factors; and  the  merger would  avoid  certain of  the  costs
associated  with a  liquidation of  the Partnership's  properties, such  as real
estate broker fees and transfer taxes.
 
    The letter outlined a merger which would contain the following elements: the
ability of  Unitholders  to  exchange their  Units  for  cash or  stock  of  the
Purchaser,  based on  the net  asset value of  the Partnership;  net asset value
would be determined  based upon an  appraisal of the  Partnership's real  estate
assets  as adjusted  for the  Partnership's other  assets and  liabilities; upon
completion of  the  merger,  the  Partnership  would  make  a  liquidating  cash
distribution  to partners in  order to reconcile to  the Partnership's net asset
value; the number of  shares to be received  by Unitholders would be  determined
based  upon the  average closing price  of REIT  Shares for the  20 trading days
preceding the week prior to the  special meeting of the Unitholders; the  merger
would  require the approval of a majority of Unitholders; any Unitholder who did
not vote or  did not specify  either cash or  stock would receive  stock in  the
merger;  consummation of the merger with respect to the Partnership would not be
dependent  upon  consummation  of  the   mergers  with  respect  to  the   Other
Partnerships; and the solicitation period with respect to the merger would be 30
to 45 days.
 
    The  letter presented preliminary analyses of the value of the Partnership's
properties of $43.6 million to $45.8 million, resulting in a net asset value  of
$32.7  million to $34.8 million and a net  asset value per Unit of $260 to $280.
For purposes of  the letter, net  asset value was  comprised of the  sum of  the
Purchaser's  internal  valuation of  the Partnership's  properties and  the book
value  of  the  Partnership's  non-real  estate  assets  less  the  sum  of  the
Partnership's  liabilities and  estimated transaction  costs. The  analyses were
based upon the Partnership's 1995  budgeted net operating income adjusted  based
upon  the Partnership's actual performance  when compared against budget through
June 1995,  capitalization rates  of 10.5%  to 10%  and Partnership  transaction
costs  of  1.5%  of  net  asset value.  In  addition,  the  letter  compared the
distributions received by  Unitholders for the  first quarter of  1995 with  the
estimated dividends that would be received by Unitholders exchanging their Units
for shares based upon the Purchaser's then-current distribution rate of $.46 per
share,  assuming a share  price of $23. Based  upon these assumptions, dividends
would range from  8% to  18% above then-current  Partnership distributions.  The
letter  also contained an analysis  of the taxable gain per  Unit as a result of
the transaction based upon  the Partnership's 1994 tax  return. The letter  also
noted that the anticipated total transaction costs would be from 2% to 3% of net
asset  value and proposed that  the costs be shared  by the Partnerships and the
Purchaser.
 
    The letter included  consideration of the  liquidation of the  Partnerships'
assets,  concluding  that it  was  a less  than  optimal time  to  liquidate the
Partnerships' portfolios. This  conclusion was based  upon then-current  general
market  conditions and  performance of the  properties owned and  managed by the
Purchaser. The letter noted the general deterioration of the real estate  market
which  had affected property values and  decreased sales activities, the reduced
sources of traditional  real estate  financing and  the oversupply  in the  real
estate  market caused by overbuilding and  sales of troubled properties acquired
by financial institutions. Although conditions had been improving more recently,
these
 
                                       8
<PAGE>
developments had  resulted  in  a  reduced market  for  sale  and  financing  of
commercial  real estate. The letter noted that, during the same time period, the
financial performance of the properties owned  and managed by the Purchaser  had
improved   and,   assuming  that   development   of  new   facilities   did  not
disproportionately  impact   the  Partnerships,   the  Partnerships'   financial
performance  was anticipated to improve. The  letter noted that the Unitholders'
net proceeds available for reinvestment after liquidation would be significantly
reduced as a result of real  estate commissions and other sales expenses.  Based
upon  these considerations, Mr. Barbo concluded  that it was not the appropriate
time to  liquidate  the  Partnerships'  portfolios; however,  a  merger  of  the
Partnerships with the Purchaser would provide Unitholders with an opportunity to
participate  in  the  benefits  of  publicly traded  REITs  in  general  and the
Purchaser in particular.
 
    The letter also discussed the benefits  and detriments of a continuation  of
the operation of the Partnership and concluded that, while the Partnerships were
performing  well and  it was anticipated  that distributions and  cash flow from
operations would continue to improve, continuation would not provide Unitholders
with the benefits  of the  merger. In  addition, the  letter noted  that it  was
anticipated  that  the Purchaser's  cash flow  and  funds from  operations would
improve at a faster  rate than the  Partnerships' as a  result of greater  asset
diversification and acquisition and development activities.
 
    THE  FIRST  SENTENCE  OF  THE  TWELFTH  PARAGRAPH  IN  THE  SECTION ENTITLED
"BACKGROUND AND PURPOSES OF THE TRANSACTION -- BACKGROUND OF THE TRANSACTION" IS
HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    On March 25, 1996, in connection with preliminary discussions relating to  a
potential business transaction which were subsequently terminated, the Purchaser
and  Public Storage,  Inc. ("PS") entered  into a  customary confidentiality and
standstill agreement whereby PS agreed that it would not acquire any interest in
the Purchaser or any of the Purchaser's affiliates (including the  Partnerships)
for  a period of two  years without the Purchaser's  consent (preventing PS from
making a competing tender offer for the units of limited partnership interest in
the Partnerships or proposing an  alternative transaction with the  Partnerships
without the permission of the Purchaser).
 
    THE THIRTEENTH PARAGRAPH IN THE SECTION ENTITLED "BACKGROUND AND PURPOSES OF
THE TRANSACTION -- BACKGROUND OF THE TRANSACTION" IS HEREBY AMENDED AND RESTATED
IN ITS ENTIRETY AS FOLLOWS:
 
    From  late March 1996 through May 1996, representatives of the Purchaser and
the Partnerships discussed the possibility of the Purchaser's acquisition of the
Partnerships. During  this  time,  the  parties  discussed  the  possibility  of
structuring  the acquisition as a cash tender  offer followed by a merger of the
Partnerships into the Purchaser  in which limited  partners of the  Partnerships
would  receive REIT Shares in exchange  for their limited partnership interests.
The parties viewed a two-step transaction (a partial cash tender offer  followed
by  a stock merger) as being more desirable than a one-step cash-election merger
transaction. Completion of a merger would  be subject to a number of  conditions
(including  the approval  of limited  partners of  each of  the Partnerships and
registration of the REIT Shares) that would  not be conditions to a cash  tender
offer.  Thus, the  two-step transaction  would provide  limited partners  of the
Partnerships with an  opportunity to  obtain liquidity  for a  portion of  their
limited  partnership interests more  quickly than waiting  for completion of the
merger. In addition,  the Purchaser  favored a two-step  transaction because  it
believed that such structure might enable it to acquire an ownership position in
the  Partnerships more quickly than  would be the case  in a one-step merger and
would enable the Purchaser to acquire Units that it could then vote in favor  of
a  second-step merger. During the  last week of May  1996, the Special Committee
proposed to the Partnerships that the  Purchaser acquire the Partnerships for  a
price  equal to  each of their  respective net  asset values pursuant  to a cash
tender offer for up to a  designated percentage of outstanding units of  limited
partnership  interest  followed by  a merger  in which  limited partners  of the
Partnerships would receive REIT Shares with a value equal to the respective  per
unit  net asset value of the Partnership. The value attributable to a REIT Share
was proposed to be  the average of the  closing prices for a  REIT Share on  the
NYSE    during   a    designated   future   period    (the   "Average   Price").
 
                                       9
<PAGE>
The parties discussed the provision in each Partnership's partnership  agreement
which  prohibits the transfer of any unit of limited partnership interest if the
proposed transfer would cause  the Partnership to  terminate for federal  income
tax  purposes due to a sale or exchange of  50% or more of the total interest in
the Partnership's capital and profits in a 12 month period. See "Certain Federal
Income Tax Consequences -- No Constructive Termination of the Partnership."  The
parties  concluded that  they should set  the percentage  of limited partnership
interests that would be  sought in the  first step tender offer  so that if  the
offer were fully subscribed, the number of limited partnership interests sold to
the  Purchaser would not result in a  termination of any of the Partnerships and
thus the limited partnership interests could be transferred to the Purchaser  in
accordance with the terms of the partnership agreements.
 
    THE   FIRST  SENTENCE  OF  THE  FIRST  PARAGRAPH  IN  THE  SECTION  ENTITLED
"BACKGROUND AND PURPOSES  OF THE TRANSACTION  -- PURPOSES AND  STRUCTURE OF  THE
TRANSACTION" IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    This Offer is being made and the Merger will be proposed for approval (i) to
enable  the Purchaser to  acquire the entire equity  interest in the Partnership
and (ii) to  give Unitholders an  opportunity to (a)  liquidate their Units  for
cash  subject to the proration  provisions of this Offer  if greater than 52,000
Units are tendered (see "The Offer" -- Section 1 ("Terms of the Offer")) or  (b)
continue  to own an equity interest in  a portfolio of properties, including the
Partnership's properties, through an acquisition of REIT Shares.
 
    THE  THIRD  SENTENCE  OF  THE  SECOND  PARAGRAPH  IN  THE  SECTION  ENTITLED
"BACKGROUND  AND PURPOSES  OF THE TRANSACTION  -- PURPOSES AND  STRUCTURE OF THE
TRANSACTION" IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    Because the Partnership Agreement prohibits the transfer of any Unit if  the
proposed  transfer  would cause  the Partnership  to  terminate for  federal tax
purposes due to a sale or exchange of  50% or more of the total interest in  the
Partnership's  capital and profits in a  12 month period, the maximum percentage
of Units sought by the Purchaser in  the Offer was set to prevent a  termination
of the Partnership under those circumstances.
 
          FAIRNESS OF THE TRANSACTION; POSITION OF THE GENERAL PARTNER
 
    THE  SECTION ENTITLED "FAIRNESS OF THE  TRANSACTION; POSITION OF THE GENERAL
PARTNER -- RECOMMENDATION OF THE GENERAL PARTNER" IS HEREBY AMENDED AND RESTATED
IN ITS ENTIRETY AS FOLLOWS:
 
RECOMMENDATION OF THE GENERAL PARTNER
 
    Based upon  its  analysis  of  the  Transaction,  the  General  Partner  has
concluded  that the  Offer Price  and the  Merger Consideration  constitute fair
consideration to Unitholders and  that the terms of  this Offer and the  Merger,
when  considered as a  whole, are fair  to the Unitholders.  The General Partner
formed  this   conclusion  notwithstanding   the   fact  that   no   independent
representative  was engaged by the General Partner to negotiate the terms of the
Transaction on behalf of the Unitholders and that the Partnership Agreement does
not  require  a  majority  vote  of  unaffiliated  Unitholders  to  approve  the
Transaction.  The factors considered  by the General Partner  in its analysis of
the fairness of the Offer and the  Merger are set forth below. Charles K.  Barbo
and SGPI, each an affiliate of the Partnership, have adopted the analysis of the
General Partner as set forth in this Offer to Purchase.
 
    The  General Partner recommends that  those Unitholders who desire immediate
liquidity tender  their  Units  pursuant  to  this  Offer  and  that  all  other
Unitholders  retain their Units  and, instead, participate  in the Merger. There
can be no assurance that the approval of the Merger by the holders of a majority
of the Units will be received or that the other conditions to the Merger will be
satisfied or waived, and that the Merger  will be consummated. If the Merger  is
not  consummated, those Unitholders who do not  tender their Units in this Offer
will continue to have an economic interest in
 
                                       10
<PAGE>
the Partnership. The General  Partner has significant  conflicts of interest  in
this  transaction, which conflicts arise, among other things, from the fact that
certain representatives  of  the  General  Partner  are  also  officers  of  the
Purchaser. See "Special Considerations."
 
    THE  THIRD PARAGRAPH OF  THE SECTION ENTITLED  "FAIRNESS OF THE TRANSACTION;
POSITION OF THE GENERAL PARTNER -- FACTORS CONSIDERED BY THE GENERAL PARTNER  --
DETERMINATION OF MERGER CONSIDERATION" IS HEREBY AMENDED BY ADDING THE FOLLOWING
SENTENCE IMMEDIATELY AFTER THE LAST SENTENCE OF THAT PARAGRAPH:
 
    Unitholders  should note that although the  Stanger Fairness Opinions do not
address the fairness of the Merger Consideration if the actual REIT Share  Price
is less than $22.25, the General Partner believes the method for determining the
Merger  Consideration is  fair if  the REIT  Share Price  is between  $22.25 and
$21.50 for the reasons  stated in clause  (iv) of the  previous sentence and  is
fair if the REIT Share Price is less than $21.50 because the General Partner may
withdraw  its recommendation in favor of the Merger or terminate the Acquisition
Agreement if the Purchaser does not agree to pay the Additional Consideration.
 
    THE SECTION ENTITLED "FAIRNESS OF  THE TRANSACTION; POSITION OF THE  GENERAL
PARTNER  -- FACTORS  CONSIDERED BY  THE GENERAL PARTNER  -- FAIRNESS  IN VIEW OF
CONFLICTS OF  INTEREST"  IS HEREBY  AMENDED  AND  RESTATED IN  ITS  ENTIRETY  AS
FOLLOWS:
 
    FAIRNESS  IN VIEW OF CONFLICTS OF INTEREST.   Charles K. Barbo, the Chairman
of the Board,  President and Chief  Executive Officer and  a stockholder of  the
Purchaser,  is an individual general partner of the General Partner and the sole
shareholder and  director  of  the  corporate general  partner  of  the  General
Partner.  Arthur  W. Buerk,  a stockholder  of the  Purchaser, is  an individual
general partner of the General Partner,  and the Purchaser is a limited  partner
of  the General  Partner. The  General Partner will  receive 7.5%  of the Merger
Consideration in  exchange  for its  interest  as  the General  Partner  of  the
Partnership. See "Interests of Certain Persons -- General Partner's Interest."
 
    In connection with the merger of Shurgard Incorporated with the Purchaser in
1995,  the Purchaser agreed  to deliver REIT  Shares as additional consideration
for that merger under certain circumstances  upon the liquidation of the  assets
of  certain  partnerships  sponsored  by  Shurgard  Incorporated,  including the
Partnership and the Other Partnerships  (the "Contingent Share Agreement").  The
Purchaser  entered into the Contingent Share Agreement because the Purchaser had
concluded that  it would  be difficult  at the  time of  the Management  Company
Merger   to  value   Shurgard  Incorporated's   interests  in   certain  limited
partnerships (including  the Partnerships).  Accordingly, Shurgard  Incorporated
shareholders did not receive any consideration with respect to such interests at
the  time of the Management Company Merger,  but instead are entitled to receive
additional consideration  at  a future  valuation  date or  when  the  Purchaser
receives  proceeds from the sale of such interests. If any of the Merger and the
Additional Mergers is consummated, certain executive officers and other  members
of  the  Purchaser's  management  will  receive  REIT  Shares  pursuant  to  the
Contingent Share  Agreement. See  "Interests of  Certain Persons  --  Contingent
Share Agreement."
 
    The  General  Partner  did  not engage  independent  representatives  of the
Unitholders to negotiate, review  and approve the terms  of the Transaction  and
the  terms of the Transaction are not  the results of arms' length negotiations.
The  General  Partner   believes  that   its  recommendation   results  from   a
determination  that the Transaction  is more attractive  to Unitholders than any
alternatives considered  by the  General Partner,  and that  this  determination
results  from the  General Partner's  discharge of  its fiduciary  duties to the
Unitholders and is not  affected by the conflicts  of interest described  above.
The  General  Partner has  based its  conclusion regarding  the fairness  of the
Transaction to Unitholders  on the factors  discussed in this  "Fairness of  the
Transaction;  Position  of the  General  Partner" section.  The  General Partner
believes that  the  analysis was  performed  in a  good  faith exercise  of  its
fiduciary duty, unaffected by these conflicts of interest.
 
                                       11
<PAGE>
    THE  SECOND PARAGRAPH OF THE SECTION  ENTITLED "FAIRNESS OF THE TRANSACTION;
POSITION OF THE GENERAL PARTNER -- FACTORS CONSIDERED BY THE GENERAL PARTNER  --
COMPARISON OF CERTAIN BENEFITS AND DETRIMENTS OF ALTERNATIVES TO THE TRANSACTION
- --  LIQUIDATION OF  THE PARTNERSHIP" IS  HEREBY AMENDED BY  ADDING THE FOLLOWING
SENTENCE IMMEDIATELY AFTER THE LAST SENTENCE OF THAT PARAGRAPH:
 
    While Unitholders could purchase REIT Shares in the public market using  the
proceeds  of  liquidation, the  number  of REIT  Shares  they would  be  able to
purchase would be less than the number of REIT Shares they would receive in  the
Merger  because the Partnership would incur  more expenses in a liquidation than
in  the  Merger  and  because   Unitholders  would  typically  incur   brokerage
commissions  in connection with their purchase of  the REIT Shares in the public
market.
 
    THE  LAST  TWO  PARAGRAPHS  OF   THE  SECTION  ENTITLED  "FAIRNESS  OF   THE
TRANSACTION;  POSITION  OF  THE GENERAL  PARTNER  -- FACTORS  CONSIDERED  BY THE
GENERAL PARTNER -- COMPARISON OF CERTAIN BENEFITS AND DETRIMENTS OF ALTERNATIVES
TO THE TRANSACTION  -- LIQUIDATION OF  THE PARTNERSHIP" ARE  HEREBY AMENDED  AND
RESTATED IN THEIR ENTIRETY AS FOLLOWS:
 
    The  transaction  costs  associated  with  the  Merger  are  expected  to be
significantly less than those  which would be incurred  in a liquidation of  the
Partnership's  assets, primarily  because the Partnership  would incur brokerage
fees and real estate transfer taxes if the properties were liquidated and  would
likely  be  responsible  for 100%  of  those  expenses rather  than  sharing the
transaction costs with the  acquiror as provided  in the Acquisition  Agreement.
See  "The  Acquisition  Agreement --  Fees  and Expenses."  The  General Partner
estimates that the  brokerage fees would  be approximately 2%  of the  appraised
value of the Partnership's properties (or approximately $1 million) and that the
transfer taxes would total approximately $150,000. If the Merger is consummated,
the Partnership will effectively dispose of all of its assets and liabilities in
a  single transaction, which will minimize  the liquidation costs. If the assets
of the Partnership were liquidated over time, not only is it likely that  higher
transaction  costs would be incurred, but  distributions to the Unitholders from
the  Partnership's  cash  flow  from   operations  may  be  reduced  since   the
Partnership's  fixed costs, such  as general and  administrative expenses, would
not be proportionately reduced with the liquidation of assets.
 
    The  General  Partner  favors  the  Transaction  over  liquidation  of   the
Partnership's  assets  because  this Offer  permits  those  Unitholders desiring
immediate liquidity to obtain cash,  while permitting the remaining  Unitholders
to  participate  in  the  Merger  which, if  consummated,  will  enable  them to
participate in acquisition  and development opportunities  existing in the  real
estate market through equity ownership in the Purchaser. Unlike the Partnership,
which  is not in a  position to take advantage  of external growth opportunities
since it  has already  committed its  capital  and is  not authorized  to  raise
additional   funds  or  reinvest  net  sale  or  refinancing  proceeds  for  new
investments, the  Purchaser  not  only  may reinvest  net  sale  or  refinancing
proceeds  but also  may raise  additional capital  through the  sale of  debt or
equity securities,  allowing  the  Purchaser to  take  advantage  of  investment
opportunities for acquisition or development that may be available. In addition,
the   estimated   transaction  costs   associated   with  the   Transaction  are
significantly less than those  which would be incurred  in a liquidation of  the
Partnership's assets on a single transaction or multiple transaction basis.
 
    THE  SECTION ENTITLED "FAIRNESS OF THE  TRANSACTION; POSITION OF THE GENERAL
PARTNER -- FACTORS CONSIDERED  BY THE GENERAL PARTNER  -- COMPARISON OF  CERTAIN
BENEFITS  AND DETRIMENTS OF  ALTERNATIVES TO THE  TRANSACTION -- CONTINUATION OF
THE PARTNERSHIP" IS HEREBY AMENDED BY ADDING THE FOLLOWING PARAGRAPH IMMEDIATELY
AFTER THE THIRD PARAGRAPH OF THAT SECTION:
 
    One of the significant differences between the Partnership and the Purchaser
is that the Partnership is a finite life entity and the Purchaser is an infinite
life entity. Continuing the  Partnership would preserve Unitholders'  investment
in  a  finite life  entity,  with the  eventual  liquidation of  that investment
resulting from  a  sale of  the  assets of  the  Partnership. In  contrast,  the
Purchaser does not expect to dispose of its investments within any specific time
periods and, in any event, plans to retain the net
 
                                       12
<PAGE>
sale  proceeds  for future  investments.  Stockholders are  expected  to achieve
liquidity for their investments by trading REIT Shares in the public market  and
not through the liquidation of the Purchaser's assets. The REIT Shares may trade
at  a discount  from, or  premium to, the  liquidation value  of the Purchaser's
properties.
 
    THE THIRD  PARAGRAPH AND  TABLE IN  THE SECTION  ENTITLED "FAIRNESS  OF  THE
TRANSACTION;  POSITION  OF  THE  GENERAL PARTNER  --  COMPARISON  OF TRANSACTION
CONSIDERATION TO ALTERNATIVES  -- GENERAL"  ARE HEREBY AMENDED  AND RESTATED  IN
THEIR ENTIRETY AS FOLLOWS:
 
    The estimated values presented in the following table are based upon certain
assumptions  that relate, among other things, to  (i) the REIT Share Price as of
the date of the Merger being within  the Share Price Range, (ii) projections  as
to  the Partnership's future revenues, expenses, cash flow and other significant
financial  matters,  (iii)  the  capitalization  rates  that  will  be  used  by
prospective  buyers when the  Partnership's assets are  liquidated, (iv) selling
costs, (v)  appropriate  discount rates  to  apply  to expected  cash  flows  in
computing the present value of the cash flows and (vi) the manner of sale of the
Partnership's  properties. Actual  results may vary  from those  set forth below
based on  numerous  factors,  including  interest  rate  fluctuations,  tax  law
changes,  supply and demand for self storage facilities, the manner in which the
properties  are  sold  and  changes  in  availability  of  capital  to   finance
acquisitions  of  self  storage properties.  Each  Unit in  the  following table
represents an original investment of $250.
 
<TABLE>
<CAPTION>
                                                                             ESTIMATED LIQUIDATION
                                                                                 VALUE PER UNIT
                                     SECONDARY          ESTIMATED GOING       ASSUMING PARTNERSHIP
                                    MARKET PRICE         CONCERN VALUE          ASSETS SOLD AT:
                   MERGER           PER UNIT (2)          PER UNIT (3)      ------------------------
 OFFER PRICE    CONSIDERATION   --------------------  --------------------   APPRAISED    NET BOOK
  PER UNIT      PER UNIT (1)      HIGH        LOW       HIGH        LOW      VALUE (4)    VALUE (5)
- -------------  ---------------  ---------  ---------  ---------  ---------  -----------  -----------
<S>            <C>              <C>        <C>        <C>        <C>        <C>          <C>
  $     308       $     308     $     200  $     165  $     304  $     283   $     299    $     192
</TABLE>
 
- ------------------------------
(1) Assumes the REIT  Share Price is  within the Share  Price Range. The  Merger
    Consideration is payable in REIT Shares, cash in lieu of any fractional REIT
    Shares  and, in  certain circumstances,  additional cash  consideration. See
    "The Acquisition Agreement -- The Merger."
 
(2) The secondary  market prices  are those reported  to Stanger  for the  first
    calendar quarter of 1996. See "Market Prices of Units."
 
(3)  The going concern  value estimates are  based upon a  number of assumptions
    regarding the  future net  operating income  and cash  distributions of  the
    Partnership  and assume a disposition of the Partnership's assets at the end
    of 2000. See  "-- Going  Concern Value." The  per Unit  going concern  value
    estimates  were calculated based  upon the General  Partner's aggregate high
    and low going  concern value  estimates for Unitholders  of $36,242,674  and
    $33,749,516, respectively.
 
(4)  Estimated Liquidation Value at Appraised  Value is based primarily upon the
    Appraisal and adjustments  for non-real  estate assets  and liabilities  and
    estimated   selling  costs.  See  "--   Liquidation  Value."  The  per  Unit
    liquidation value at Appraised Value estimate was calculated based upon  the
    General  Partner's aggregate  liquidation value at  Appraised Value estimate
    for Unitholders of $35,638,656.
 
(5) Estimated Liquidation Value at  Net Book Value is  computed as of March  31,
    1996 less estimated selling costs. See "-- Liquidation Value." The aggregate
    net  book value  of $22,851,497  represents the  value of  the Partnership's
    equity as of March 31, 1996 allocable to Unitholders computed in  accordance
    with  GAAP,  less  selling  costs equal  to  4%  of the  book  value  of the
    Partnership's real estate assets.
 
    THE SECOND PARAGRAPH OF THE  SECTION ENTITLED "FAIRNESS OF THE  TRANSACTION;
POSITION  OF THE GENERAL  PARTNER -- COMPARISON  OF TRANSACTION CONSIDERATION TO
ALTERNATIVES --  GOING CONCERN  VALUE" IS  HEREBY AMENDED  AND RESTATED  IN  ITS
ENTIRETY AS FOLLOWS:
 
    The  General Partner has presented two  estimates of the going concern value
of the  Partnership on  a  per Unit  basis, which  estimates  are based  on  the
five-year property cash flows beginning in 1996 used by Stanger in preparing the
Appraisal,  adjusted for general and  administrative expenses (which are assumed
to increase at the rate of 3.5%  per year), debt service payments and  principal
amortization,  and to  reflect the allocation  of the  Partnership's value among
Unitholders  and  the  General  Partner  in  accordance  with  the   Partnership
Agreement. The 1996 beginning property cash flow used
 
                                       13
<PAGE>
in  performing the going concern value  analysis was $4,790,000, and that amount
was increased  for  purposes  of the  analysis  by  a compound  annual  rate  of
approximately  4.0%  over the  projection period.  The  going concern  value was
established by computing the present  value of the projected distributions  with
respect  to  the Units,  discounted at  the rate  of 13.5%  per annum  under the
conservative scenario  and  at  the rate  of  12.5%  per annum  under  the  more
favorable  scenario. In determining the going  concern value of the Partnership,
the General Partner assumed  that the Partnership's  non-real estate assets  and
liabilities  on December 31,  2000 are the  same as those  on December 31, 1995,
adjusted for principal amortization of  $2,150,421 (including a balloon  payment
due  in 1996  of approximately $1,000,000),  resulting in an  excess of non-real
estate liabilities over non-real estate assets of $8,147,988. In determining the
discount rates deemed appropriate  for the going  concern analysis, the  General
Partner  considered, among other factors, the rates of return generally required
by real estate investors, the discount rates utilized in the Appraisal, and  the
amount  and maturities  of debt encumbering  the properties  and the refinancing
risks related  thereto.  Under  the  conservative  scenario,  the  Partnership's
income-producing  assets are sold  at the end  of 2000 for  an all-cash purchase
price of $55,219,048,  which is  sufficient to yield  the buyer  a 10.5%  return
based  on projected  property cash flows  for 2001  of approximately $5,798,000.
Under the  more  favorable  scenario,  it  is  assumed  that  the  Partnership's
income-producing  assets are sold  at the end  of 2000 for  an all-cash purchase
price of $57,980,000, which is sufficient to yield the buyer a 10% return  based
upon  projected  property cash  flows in  2001  of approximately  $5,798,000. In
addition, it was assumed that  the excess land held  by the Partnership is  sold
for approximately $446,000.
 
    THE  SECTION ENTITLED "FAIRNESS OF THE  TRANSACTION; POSITION OF THE GENERAL
PARTNER -- COMPARISON OF TRANSACTION TO ALTERNATIVES -- GOING CONCERN VALUE"  IS
HEREBY  AMENDED  BY  ADDING THE  FOLLOWING  AFTER  THE THIRD  PARAGRAPH  OF THAT
SECTION:
 
    Set forth below is a chart showing the calculation of the Partnership's cash
flows used  to calculate  the going  concern value  based upon  the  assumptions
described above.
 
<TABLE>
<CAPTION>
                                          GENERAL AND                                             UNITHOLDERS'
                             PROPERTY    ADMINISTRATIVE                 BUILDOUT     PRINCIPAL    SHARE OF NET
YEAR                         CASH FLOW      EXPENSE     DEBT SERVICE   IN PROGRESS  AMORTIZATION    CASH FLOW
- --------------------------  -----------  -------------  -------------  -----------  ------------  -------------
<S>                         <C>          <C>            <C>            <C>          <C>           <C>
1996......................  $ 4,790,000   $  (171,200)   $  (857,813)   $ 257,146    $(1,182,536)  $ 2,205,240
1997......................    5,074,000      (177,192)      (765,066)                  (214,794)     3,721,101
1998......................    5,282,000      (183,394)      (747,882)                  (231,978)     3,912,809
1999......................    5,462,000      (189,813)      (729,325)                  (250,535)     4,077,711
2000......................    5,634,000      (196,456)      (709,282)                  (270,578)     4,234,800
                            -----------  -------------  -------------  -----------  ------------  -------------
TOTAL.....................  $26,242,000   $  (918,054)   $(3,809,368)   $ 257,146    $(2,150,421)  $18,151,660
                            -----------  -------------  -------------  -----------  ------------  -------------
                            -----------  -------------  -------------  -----------  ------------  -------------
</TABLE>
 
    The  Partnership does  not as  a matter of  course make  public forecasts or
projections as to  future performance  or earnings. However,  in performing  its
going  concern  analysis, the  General  Partner prepared  the  above projections
relating to the Partnership's future  cash flows. THE PROJECTIONS WERE  PREPARED
SOLELY  FOR INTERNAL USE AND NOT WITH  A VIEW TO PUBLIC DISCLOSURE OR COMPLIANCE
WITH PUBLISHED  GUIDELINES  OF  THE  COMMISSION  REGARDING  PROJECTIONS  OR  THE
GUIDELINES ESTABLISHED BY THE AMERICAN INSTITUTE OF CERTIFIED PUBLIC ACCOUNTANTS
REGARDING  PROJECTIONS AND ARE  INCLUDED IN THIS OFFER  TO PURCHASE ONLY BECAUSE
SUCH INFORMATION WAS  MADE AVAILABLE TO  STANGER AND ALEX.  BROWN. In  addition,
because   the  estimates  and  assumptions   underlying  these  projections  are
inherently subject  to significant  economic and  competitive uncertainties  and
contingencies,  which  are beyond  the Partnership's  control,  there can  be no
assurance that the projections will be realized. Actual results may be higher or
lower than  those set  forth below.  Deloitte &  Touche LLP,  the  Partnership's
independent  auditor, has not examined, compiled or otherwise applied procedures
to the financial projections presented above, and, accordingly, does not express
an opinion or any other form of assurance on the financial projections.
 
                                       14
<PAGE>
    THE SECTION ENTITLED "FAIRNESS OF  THE TRANSACTION; POSITION OF THE  GENERAL
PARTNER  -- THE SPECIAL  COMMITTEE -- RECOMMENDATION OF  THE GENERAL PARTNER" IS
HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    RECOMMENDATION OF THE GENERAL PARTNER.  The Special Committee considered the
conclusions as  to fairness  of the  General Partner  and adopted  the  analysis
underlying  those conclusions for  purposes of reaching  its own conclusion that
the Transaction is fair  to Unitholders. See "--  Recommendation of the  General
Partner,"  "-- Factors Considered by the  General Partner" and "-- Comparison of
Transaction Consideration to Alternatives." The General Partner has  significant
conflicts  of interest in  this transaction, which  conflicts arise, among other
things, from the fact  that certain representatives of  the General Partner  are
also officers of the Purchaser. See "Special Considerations."
 
    THE  SECTION ENTITLED "FAIRNESS OF THE  TRANSACTION; POSITION OF THE GENERAL
PARTNER -- THE SPECIAL COMMITTEE -- PREMIUM OVER RECENT MARKET PRICES" IS HEREBY
AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    PREMIUM OVER RECENT  MARKET PRICES.   The Special  Committee considered  the
fact  that the Offer Price and the Merger Consideration (assuming the REIT Share
Price remains within the  Share Price Range) represents  a premium of more  than
54%  over the highest sales  price in the secondary market  of the Unit known to
the General Partner between January 1, 1992 and the end of the first quarter  of
1996. See "Market Prices of Units."
 
                   APPRAISAL; OPINIONS OF FINANCIAL ADVISORS
 
    THE  FOURTH  PARAGRAPH  OF  THE  SECTION  ENTITLED  "APPRAISAL;  OPINIONS OF
FINANCIAL ADVISORS  -- REAL  ESTATE  PORTFOLIO APPRAISAL  BY STANGER  --  INCOME
APPROACH" IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY TO READ AS FOLLOWS:
 
    Stanger  then  capitalized, at  terminal  capitalization rates  ranging from
10.25% to  10.75% (11%  for the  office property)  the estimated  net  operating
income of each property for the 12 months ending December 31, 2006, to determine
the property's residual value. The residual value was discounted after deducting
appropriate  sales  expenses to  a present  value using  the same  discount rate
applied to the stream of annual cash flows. The discount rates utilized, ranging
from 12.25% to  12.5%, were  based on  current acquisition  criteria among  self
storage  facility  investors, commercial/industrial  property  investors' target
rates for  return and  the historical  spread in  rates of  return between  real
estate  and other investments. Stanger then correlated the values resulting from
each method (direct  capitalization and  discounted cash  flow) to  arrive at  a
final  income approach valuation. The indicated aggregate value of the portfolio
of properties  based on  the income  approach valuation  was $50,890,000,  after
adjustment  for any  deferred maintenance  items and  the value  of certain land
parcels held for resale.
 
    THE SECTION  ENTITLED "APPRAISAL;  OPINIONS OF  FINANCIAL ADVISORS  --  REAL
ESTATE  PORTFOLIO APPRAISAL BY  STANGER -- SALES  COMPARISON APPROACH" IS HEREBY
AMENDED AND RESTATED IN ITS ENTIRETY TO READ AS FOLLOWS:
 
    SALES COMPARISON  APPROACH.   Stanger  compiled transaction  data  involving
properties  similar  in type  to  the Partnership's  properties  by interviewing
sources  in  local  markets  to  identify  recent  sales  of  self  storage   or
office/storage   properties,   reviewing  publicly   available   information  on
acquisitions of  self  storage  properties, reviewing  information  provided  by
management,  and contacting industry sources. Using this data, Stanger performed
a comparable sales analysis based upon  price per square foot. A probable  range
of  value  per  square  foot  was  estimated  for  each  property  based  on the
relationship between observed  sales prices  per square foot  and net  operating
income  per square foot. Price per square foot as estimated by this analysis was
multiplied by  the  rentable  square  footage of  each  property  to  derive  an
estimated  range of value. The valuation  included consideration of the value of
 
                                       15
<PAGE>
excess land parcels currently held for resale. The indicated aggregate value  of
the  portfolio  of  properties  based  on  the  sales  comparison  approach  was
$51,350,000 after adjustment for any deferred maintenance items and the value of
certain land parcels held for resale.
 
    Stanger reconciled the estimated values resulting from the sales  comparison
approach  and the  income approach for  each property, and  the resulting values
were summed  to  determine  the  estimated value  of  the  Partnership's  entire
portfolio. Stanger adjusted the value conclusion for excess land held for resale
and to reflect any deferred maintenance items associated with the properties. In
determining  a  final  value  of  the  portfolio  of  properties,  Stanger  also
reconciled the indicated aggregate portfolio values based on the income approach
and the  sales comparison  approach. In  determining a  final conclusion  as  to
value,  the income approach  was given primary  consideration by Stanger because
properties such as those  owned by the Partnership  are typically purchased  and
sold  based upon their income characteristics. Stanger gave the sales comparison
approach secondary consideration.
 
    THE SECTION  ENTITLED "APPRAISAL;  OPINIONS OF  FINANCIAL ADVISORS  --  REAL
ESTATE   PORTFOLIO   APPRAISAL   BY  STANGER   --   COMPENSATION   AND  MATERIAL
RELATIONSHIPS" IS HEREBY AMENDED BY  ADDING THE FOLLOWING IMMEDIATELY AFTER  THE
LAST SENTENCE IN THAT PARAGRAPH:
 
    The  General Partner  has adopted the  Appraisal in  forming its conclusions
regarding the fairness of the Transaction to Unitholders.
 
    THE SECTION ENTITLED "APPRAISAL; OPINIONS OF FINANCIAL ADVISORS --  OPINIONS
OF  THE  PARTNERSHIP'S FINANCIAL  ADVISOR --  APPRAISAL"  IS HEREBY  AMENDED AND
RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
    APPRAISAL.   In preparing  its opinions,  Stanger performed  an  independent
appraisal of the Partnership's portfolio of properties. During the course of the
Appraisal,  Stanger performed  site inspections  of each  property owned  by the
Partnership, conducted  inquiries into  local market  conditions affecting  each
property,  reviewed  historical  and  budgeted  operating  statements  for  each
property,  conducted  interviews  with   Partnership  and  property   management
personnel,  reviewed the acquisition criteria in use in the marketplace by major
self storage  property investors  and owners  and other  real estate  investors,
reviewed  information concerning transactions involving self storage properties,
and estimated the market value of  the portfolio utilizing the income and  sales
comparison  approaches  to  value See  "--  Real Estate  Portfolio  Appraisal by
Stanger." Stanger observed that the Offer Price equals the pro rata interest per
Unit in the  Appraised Value  as adjusted by  the General  Partner for  non-real
estate assets and liabilities of the Partnership, estimated Transaction costs to
be  borne by  the Partnership  and the Unitholders'  share of  the resulting Net
Asset Value according to  the provisions of  the Partnership Agreement.  Stanger
believes  that the Net Asset Value of  the Partnership, which is based primarily
on the  appraised value  of  the Partnership's  portfolio  of properties,  is  a
reasonable basis for determining the consideration offered in the transaction.
 
    THE  THIRD  PARAGRAPH  IN  THE  SECTION  ENTITLED  "APPRAISAL;  OPINIONS  OF
FINANCIAL ADVISORS -- OPINIONS OF THE PARTNERSHIP'S FINANCIAL ADVISOR --  REVIEW
OF  LIQUIDATION  ANALYSIS" IS  HEREBY AMENDED  AND RESTATED  IN ITS  ENTIRETY AS
FOLLOWS:
 
    Stanger observed that the Offer Price and the Merger Consideration  exceeded
the  estimated liquidation value per Unit by approximately $9. The fact that the
Offer Price and Merger Consideration exceed  the estimated value which would  be
received  by Unitholders in a liquidation  of the Partnership supports Stanger's
conclusion as to the fairness of the Offer Price and the Merger Consideration.
 
    THE SECOND  PARAGRAPH  IN  THE  SECTION  ENTITLED  "APPRAISAL;  OPINIONS  OF
FINANCIAL  ADVISORS -- OPINIONS OF THE PARTNERSHIP'S FINANCIAL ADVISOR -- REVIEW
OF GOING CONCERN  ANALYSIS" IS HEREBY  AMENDED AND RESTATED  IN ITS ENTIRETY  AS
FOLLOWS:
 
    Stanger  observed that the estimated going concern values resulting from the
above analyses ranged from $304 to $283  per Unit compared with the Offer  Price
of $308 per Unit. The fact that the
 
                                       16
<PAGE>
Offer  Price and the Merger Consideration exceed the estimated value per Unit of
continuing to  operate the  Partnership as  a going  concern supports  Stanger's
conclusion as to the fairness of the Offer Price and the Merger Consideration.
 
    THE  THIRD  PARAGRAPH  IN  THE  SECTION  ENTITLED  "APPRAISAL;  OPINIONS  OF
FINANCIAL ADVISORS -- OPINIONS OF THE PARTNERSHIP'S FINANCIAL ADVISOR --  REVIEW
OF  TENDER OFFER AND SECONDARY MARKET PRICES"  IS HEREBY AMENDED AND RESTATED IN
ITS ENTIRETY AS FOLLOWS:
 
    Stanger also observed that, based on  prices reported to Stanger by  various
firms  active in  the informal secondary  market for  partnership interests, the
highest selling  price  reported for  Units  in the  informal  secondary  market
between  January 1, 1995 and the  end of the first quarter  of 1996 was $200 per
Unit compared with  the Offer Price  of $308  per Unit. Although  prices in  the
informal secondary market for partnership interests generally do not reflect the
full  value of a partnership's assets (due in part to the discount a buyer would
ascribe to a minority interest), the fact that the Offer, if not followed by the
Merger, could result in the acquisition by the Purchaser of a minority  interest
in  the Partnership and that the Offer Price exceeds the selling prices reported
for Units in the  informal secondary market,  in a prior tender  offer and in  a
prior  bulk purchase of Units by  the Purchaser supports Stanger's conclusion as
to the fairness of the Offer Price.
 
    THE SECTION ENTITLED "APPRAISAL; OPINIONS OF FINANCIAL ADVISORS --  OPINIONS
OF   THE   PARTNERSHIP'S  FINANCIAL   ADVISOR   --  COMPENSATION   AND  MATERIAL
RELATIONSHIPS" IS HEREBY  AMENDED BY ADDING  THE FOLLOWING SENTENCE  IMMEDIATELY
PRIOR TO THE LAST SENTENCE OF THAT SECTION:
 
    The General Partner has adopted the Stanger Fairness Opinions in forming its
conclusions regarding the fairness of the Transaction to Unitholders.
 
    THE  SIXTH  PARAGRAPH  OF  THE  SECTION  ENTITLED  "APPRAISAL;  OPINIONS  OF
FINANCIAL ADVISORS -- OPINION  OF THE PURCHASER'S  FINANCIAL ADVISOR" IS  HEREBY
AMENDED AND RESTATED IN ITS ENTIRETY TO READ AS FOLLOWS:
 
    In  connection with  the delivery  of the  Alex. Brown  Opinion, Alex. Brown
presented to the Special  Committee a report  summarizing the material  analyses
performed  and the material factors considered by Alex. Brown in connection with
rendering the Alex. Brown Opinion (the "Alex. Brown Report"). The following is a
summary of such material analyses and material factors as described in the Alex.
Brown Report and as presented to the Special Committee.
 
    THE SECTION ENTITLED "APPRAISAL; OPINIONS  OF FINANCIAL ADVISORS --  OPINION
OF THE PURCHASER'S FINANCIAL ADVISOR -- HISTORICAL FINANCIAL POSITION" IS HEREBY
AMENDED AND RESTATED IN ITS ENTIRETY TO READ AS FOLLOWS:
 
    HISTORICAL  FINANCIAL  POSITION.    Alex. Brown  reviewed  and  analyzed for
informational purposes the  historical and  current financial  condition of  the
Purchaser  and  the  Partnerships  which  included:  (i)  an  assessment  of the
Partnerships' recent financial statements; (ii)  an analysis of the  Purchaser's
and  the  Partnerships' revenue,  growth and  operating performance  trends; and
(iii) an assessment of  the Partnerships' leverage, market  share and access  to
markets.  Alex. Brown reviewed that information  solely to provide a context for
its financial analyses and reached no conclusions based upon that information.
 
    THE SECTION ENTITLED "APPRAISAL; OPINIONS  OF FINANCIAL ADVISORS --  OPINION
OF  THE PURCHASER'S FINANCIAL ADVISOR --  HISTORICAL STOCK PRICE PERFORMANCE" IS
HEREBY AMENDED AND RESTATED IN ITS ENTIRETY TO READ AS FOLLOWS:
 
    HISTORICAL STOCK PRICE PERFORMANCE.   Alex. Brown reviewed and analyzed  the
daily closing per share market prices, trading volume, and 20 day moving average
stock  price for  the REIT  Shares, from June  25, 1995  to June  25, 1996. This
information was  presented  to give  the  Special Committee  background  trading
information  over the period  indicated. Alex. Brown  also reviewed and analyzed
information regarding the market prices and trading volume of the  Partnerships'
units,  on a  quarterly basis  from September  1995 to  April 1996.  Alex. Brown
reviewed that information solely to provide a context for its financial analyses
and reached no conclusions based upon that information.
 
                                       17
<PAGE>
    THE SECTION ENTITLED "APPRAISAL; OPINIONS  OF FINANCIAL ADVISORS --  OPINION
OF THE PURCHASER'S FINANCIAL ADVISOR -- REAL ESTATE MARKET AND ECONOMIC FACTORS"
IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY TO READ AS FOLLOWS:
 
    REAL  ESTATE MARKET AND  ECONOMIC FACTORS.  In  rendering its opinion, Alex.
Brown considered, among other factors, the condition of the U.S. stock  markets,
particularly  in  the real  estate  sector, and  the  current level  of economic
activity. However, Alex. Brown did not reach any independent conclusion from the
consideration of those factors.
 
    THE SECTION ENTITLED "APPRAISAL; OPINION OF FINANCIAL ADVISOR -- OPINION  OF
THE  PURCHASER'S  FINANCIAL  ADVISOR" IS  HEREBY  AMENDED TO  ADD  THE FOLLOWING
SENTENCE IMMEDIATELY PRIOR TO THE SECOND TO LAST PARAGRAPH OF THAT SECTION:
 
    The foregoing  description  of  the  Alex.  Brown  Report  is  qualified  by
reference  to  the  full text  of  such report  which  has been  filed  with the
Commission as an exhibit to the Schedule 13E-3 and which is incorporated  herein
by  reference.  Copies of  the Alex.  Brown  Report will  be made  available for
inspection and  copying at  the  principal executive  offices of  the  Purchaser
during  regular business hours  by any interested  Unitholder, or by  his or her
representative who has been so designated  in writing, and may be inspected  and
copied,  and obtained by mail,  from the Commission as  set forth in "Additional
Information."
 
                             MARKET PRICES OF UNITS
 
    THE SECTION ENTITLED "MARKET PRICES OF  UNITS -- VOLUME OF SALES" IS  HEREBY
AMENDED  BY  REPLACING THE  LAST  LINE OF  THE TABLE  IN  THAT SECTION  WITH THE
FOLLOWING:
 
<TABLE>
<CAPTION>
                                                                                % OF TOTAL
                                                              NO. OF UNITS         UNITS            NO. OF
PERIOD                                                         TRANSFERRED      OUTSTANDING      TRANSACTIONS
- -----------------------------------------------------------  ---------------  ---------------  -----------------
<S>                                                          <C>              <C>              <C>
Six months ended June 30, 1996.............................           531           0.445%                15
</TABLE>
 
    THE  SECTION  ENTITLED   "MARKET  PRICES  OF   UNITS  --  SECONDARY   MARKET
INFORMATION"  IS HEREBY SUPPLEMENTED  BY ADDING THE  FOLLOWING IMMEDIATELY AFTER
THE LAST LINE OF THE TABLE IN THAT SECTION:
 
<TABLE>
<CAPTION>
                                                                  TRANSACTION PRICE
                                                                 --------------------
REPORTING PERIOD                                                    LOW       HIGH       NUMBER OF UNITS
- ---------------------------------------------------------------  ---------  ---------  -------------------
<S>                                                              <C>        <C>        <C>
Quarter 2......................................................  $  180.00  $  200.00              38
</TABLE>
 
                          INTERESTS OF CERTAIN PERSONS
 
    THE SECTION  ENTITLED "INTERESTS  OF CERTAIN  PERSONS --  GENERAL  PARTNER'S
INTEREST"  IS  HEREBY  AMENDED BY  REPLACING  THE  FIFTH SENTENCE  OF  THE FIRST
PARAGRAPH OF THAT SECTION WITH THE FOLLOWING SENTENCE:
 
    Accordingly, the  General  Partner  has  been limited  to  receiving  5%  of
Partnership cash distributions resulting in the receipt of such distributions by
the  General  Partner of  $96,077,  $111,764 and  $117,648  for the  years ended
December 31, 1993, 1994 and 1995,  respectively, and $58,824 for the six  months
ended June 30, 1996.
 
    THE  SECTION ENTITLED "INTERESTS  OF CERTAIN PERSONS  -- PROPERTY MANAGEMENT
SERVICES" IS HEREBY SUPPLEMENTED BY REPLACING  THE SECOND SENTENCE OF THE  FIRST
PARAGRAPH OF THAT SECTION WITH THE FOLLOWING SENTENCE:
 
    The  Purchaser (or the Predecessor  under the Management Services Agreement)
received from  the  Partnership in  payment  of these  property  management  and
advertising  fees $256,850, $407,784  and $447,716 for  the years ended December
31, 1993, 1994  and 1995, respectively,  and $226,650 for  the six months  ended
June 30, 1996.
 
                                       18
<PAGE>
                                   THE OFFER
 
    THE  FIRST  PARAGRAPH  OF THE  SECTION  ENTITLED  "THE OFFER"  --  SECTION 7
("CERTAIN CONDITIONS  OF THE  OFFER")  IS HEREBY  AMENDED  AND RESTATED  IN  ITS
ENTIRETY AS FOLLOWS:
 
    7.   CERTAIN CONDITIONS OF THE  OFFER.  Notwithstanding any other provisions
of this Offer and subject to the applicable rules of the Securities and Exchange
Commission, the Purchaser will not be required to accept for purchase any  Units
tendered,  may postpone  the acceptance for  purchase of Units  tendered and may
terminate or  amend this  Offer  if prior  to the  Expiration  Date any  of  the
following  shall occur or the Purchaser shall  have learned of the occurrence of
any such events:
 
    THE SECTION ENTITLED "THE OFFER"  -- SECTION 11 ("MISCELLANEOUS") IS  HEREBY
AMENDED  TO  ADD  THE  FOLLOWING  PARAGRAPHS  IMMEDIATELY  FOLLOWING  THE SECOND
PARAGRAPH OF THAT SECTION:
 
    PENDING LITIGATION.  On  July 16, 1996, Irving  and Roberta B. Schuman  (the
"Plaintiffs"),  unitholders  of IDS2,  filed  a purported  class  and derivative
action complaint  (the  "Complaint")  on  behalf of  themselves  and  all  other
unitholders  of the Partnerships and derivatively  on behalf of the Partnerships
in the Superior Court of the State of  Washington in and for the County of  King
naming  the Purchaser,  Charles K. Barbo,  Arthur W.  Buerk, Shurgard Associates
L.P., Shurgard  Associates  L.P.  II, Shurgard  Associates  L.P.  III,  Shurgard
General Partner, Inc. and certain other individuals (each of whom has since been
dismissed  as  a  Defendant)  as  Defendants  and  the  Partnerships  as Nominal
Defendants.
 
    In the Complaint,  the Plaintiffs  asserted claims for  breach of  fiduciary
duty,  aiding and abetting  a breach of  fiduciary duty, breach  of contract and
fraud against each of the Defendants for their actions taken in connection  with
the  Transaction.  The Plaintiffs  seek monetary  damages and  equitable relief,
including an order enjoining the  consummation of the Offers, or  alternatively,
an  order requiring  the Defendants  to issue  disclosures to  correct allegedly
false and misleading statements and omissions of material facts in all documents
prepared, filed with the SEC, issued  or disseminated to the unitholders of  the
Partnerships by Defendants in connection with the Offers.
 
    The Defendants intend to vigorously defend the lawsuit.
 
    EXCEPT AS AMENDED OR SUPPLEMENTED HEREBY, ALL PROVISIONS OF THE OFFER REMAIN
UNAFFECTED.
 
                                  SHURGARD STORAGE CENTERS, INC.
 
                                       19
<PAGE>
SCHEDULE I OF THE OFFER TO PURCHASE IS HEREBY AMENDED AND RESTATED IN ITS
ENTIRETY AS FOLLOWS:
 
                                   SCHEDULE I
 
                      DIRECTORS AND EXECUTIVE OFFICERS OF
         SHURGARD STORAGE CENTERS, INC., SHURGARD GENERAL PARTNER, INC.
                     AND THE INDIVIDUAL GENERAL PARTNERS OF
                          SHURGARD ASSOCIATES L.P. III
 
    The  following  table  sets  forth  the  name,  business  address, principal
occupation or employment at the present time and during the last five years, and
the  name,  principal  business  and   address  of  any  corporation  or   other
organization  in which such occupation or employment is or was conducted, of the
directors and executive officers  of the Purchaser and  SGPI and the  individual
general  partners of the General Partner, all of whom are citizens of the United
States. Except  as otherwise  noted, the  address of  each such  corporation  or
organization listed and the business address of each person listed is 1201 Third
Avenue,  Suite 2200, Seattle,  Washington 98101. Except  as otherwise noted, the
principal business of  each corporation  or organization listed  is real  estate
investment and each person listed has had the principal occupation or employment
listed for more than the past five years.
 
<TABLE>
<CAPTION>
                                 COMPANY/ADDRESS/
      NAME                    DESCRIPTION OF BUSINESS                        OFFICE AND DATE OF ELECTION
- ----------------  -----------------------------------------------  -----------------------------------------------
<S>               <C>                                              <C>
Charles K. Barbo  Shurgard Storage Centers, Inc.                   Director (1995-present); Chairman of the Board,
                                                                   President and Chief Executive Officer
                                                                   (1995-present)
                  Shurgard General Partner, Inc.                   Chairman of the Board; President (1992-present)
                  Shurgard Incorporated                            Chairman of the Board and Chief Executive
                                                                   Officer (1972-1995)
                  Shurgard Associates L.P.                         General Partner
                  Shurgard Associates L.P. II                      General Partner
                  Shurgard Associates L.P. III                     General Partner
Arthur W. Buerk   Shurgard General Partner, Inc.                   Director (1979-1996); President (1983-1992)
                  Shurgard Associates L.P.                         General Partner
                  Shurgard Associates L.P. II                      General Partner
                  Shurgard Associates L.P. III                     General Partner
                  Northwestern Trust                               Co-Chairman (1995-1996); President (1993-1995)
                  1201 Third Avenue, Suite 2000
                  Seattle, WA 98101
                  (banking)
                  Manus Services Corp.                             President (1992)
                  1130 Rainier
                  Seattle, WA 98140
                  (marketing)
                  Shurgard Incorporated                            President (1983-1991)
Harrell L. Beck   Shurgard Storage Centers, Inc.                   Director (1993-present); President (1993-1995);
                                                                   Chief Financial Officer, Treasurer
                                                                   (1993-present); Senior Vice President
                                                                   (1995-present)
                  Shurgard General Partner, Inc.                   Treasurer (1992-present)
                  Shurgard Incorporated                            Chief Financial Officer (1990-1995)
Michael Rowe      Shurgard Storage Centers, Inc.                   Executive Vice President (1993-present); Chief
                                                                   Operating Officer (March 19, 1996-present)
                  Shurgard General Partner, Inc.                   Vice President (1994-present); Treasurer
                                                                   (1991-1992)
                  Shurgard Incorporated                            Director of Storage Operations (1987-1993)
Kristin H. Stred  Shurgard Storage Centers, Inc.                   Secretary (1993-present); Senior Vice President
                                                                   (1995-present)
                  Shurgard General Partner, Inc.                   Secretary (1993-present)
                  Shurgard Incorporated                            Secretary and General Counsel (1992-1995)
                  The Boeing Company                               Attorney (1991-1992)
                  (aerospace and defense)
</TABLE>
 
                              Schedule I - Page 1
<PAGE>
<TABLE>
<CAPTION>
                                 COMPANY/ADDRESS/
      NAME                    DESCRIPTION OF BUSINESS                        OFFICE AND DATE OF ELECTION
- ----------------  -----------------------------------------------  -----------------------------------------------
<S>               <C>                                              <C>
David K. Grant    Shurgard Storage Centers, Inc.                   Executive Vice President (1993-present);
                                                                   Director of European Operations (May 14,
                                                                   1996-present)
                  Shurgard Incorporated                            Director of Real Estate Investments (1985-1995)
Donald W. Lusk    Shurgard Storage Centers, Inc.                   Director (1994-present)
                  Lusk Consulting Group                            President
                  P.O. Box 3235
                  Redmond, WA 98087
                  (General management consulting)
Wendell J. Smith  Shurgard Storage Centers, Inc.                   Director (1994-present)
                  W.J.S. & Associates                              Founder
                  1301 Gary Way
                  Carmichael, CA 95608
                  (advisory and consulting services)
Howard Johnson    Shurgard Storage Centers, Inc.                   Director (1996-present)
                  Howard Johnson & Company                         Chairman, President and Chief Executive Officer
                  375 Park Avenue
                  New York, NY 10152 (independent consulting)
Greenlaw Grupe    Shurgard Storage Centers, Inc.                   Director (1996-present)
                  The Grupe Company                                Chairman and Chief Executive Officer
                  3255 W. March Lane, 4th Floor
                  Stockton, CA 95219
Mark Hall         Shurgard General Partner, Inc.                   Vice President (February, 1996-present)
                  Shurgard Storage Centers, Inc.                   Regional Vice President (1993-present)
                  Shurgard Incorporated                            Regional Vice President (1993-1995)
                                                                   Northwest Regional Manager (1991-1993)
</TABLE>
 
                              Schedule I - Page 2
<PAGE>
SCHEDULE V IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
                                   SCHEDULE V
 
                            FINANCIAL STATEMENTS OF
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
                                 BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                                   ------------------------------
                                                                        1994            1995
                                                                   --------------  --------------  JUNE 30, 1996
                                                                                                   --------------
                                                                                                    (UNAUDITED)
<S>                                                                <C>             <C>             <C>
ASSETS:
  Cash and cash equivalents......................................  $      602,285  $      673,130  $      693,347
  Storage centers, net...........................................      35,121,146      34,146,500      33,777,084
  Other assets...................................................         258,242         250,621         196,886
  Amortizable assets, less accumulated amortization of
   $749,294, $1,131,762 and $1,234,550...........................         746,789         364,101         261,313
  Land held for resale...........................................         201,835         201,835         201,835
                                                                   --------------  --------------  --------------
    Total Assets.................................................  $   36,930,297  $   35,636,187  $   35,130,465
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
LIABILITIES AND PARTNERS' EQUITY (DEFICIT):
  Liabilities:
  Accounts payable and other accrued expenses....................         428,900  $      476,306  $      619,862
  Accrued transaction costs......................................                                         295,932
  Notes payable..................................................      11,619,725      10,745,854      10,333,498
                                                                   --------------  --------------  --------------
    Total Liabilities............................................      12,048,625      11,222,160      11,249,292
  Partners' equity (deficit):
  Limited partners...............................................      24,962,899      24,518,638      24,012,429
  General partner................................................         (81,227)       (104,611)       (131,256)
                                                                   --------------  --------------  --------------
    Total Partners' Equity.......................................      24,881,672      24,414,027      23,881,173
                                                                   --------------  --------------  --------------
    Total Liabilities and Partners' Equity.......................  $   36,930,297  $   35,636,187  $   35,130,465
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
</TABLE>
 
See notes to financial statements
 
                              Schedule V - Page 1
<PAGE>
                             STATEMENTS OF EARNINGS
 
<TABLE>
<CAPTION>
                                                                                           SIX MONTHS ENDED
                                                  YEAR ENDED DECEMBER 31,                      JUNE 30,
                                        -------------------------------------------  ----------------------------
                                            1993           1994           1995           1995           1996
                                        -------------  -------------  -------------  -------------  -------------
                                                                                             (UNAUDITED)
<S>                                     <C>            <C>            <C>            <C>            <C>
REVENUE:
  Rental..............................  $   4,109,845  $   6,608,932  $   7,224,762  $   3,510,447  $   3,672,665
  Interest and other income...........        230,099         56,948         36,378         13,061         14,811
                                        -------------  -------------  -------------  -------------  -------------
    Total Revenue.....................      4,339,944      6,665,880      7,261,140      3,523,508      3,687,476
EXPENSES:
  Operating...........................      1,183,446      1,625,933      1,799,970        871,708        918,909
  Property management fees............        246,650        393,684        433,316        210,619        219,450
  Depreciation........................        661,921      1,052,532      1,122,039        561,244        564,005
  Real estate taxes...................        361,790        504,422        506,460        255,982        273,031
  Interest............................        122,691        820,083        960,964        459,663        431,549
  Transaction costs...................                                                                    420,945
  Amortization........................        211,138        465,348        382,688        234,544        102,788
  Administrative......................        125,635        148,544        170,424        108,125        113,191
                                        -------------  -------------  -------------  -------------  -------------
    Total Expenses....................      2,913,271      5,010,546      5,375,861      2,701,885      3,043,868
EARNINGS..............................  $   1,426,673  $   1,655,334  $   1,885,279  $     821,623  $     643,608
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
EARNINGS PER UNIT OF LIMITED
 PARTNERSHIP INTEREST.................  $       11.37  $       13.19  $       15.02  $        6.55  $        5.13
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
DISTRIBUTIONS PER UNIT OF LIMITED
 PARTNERSHIP INTEREST.................  $       15.31  $       17.81  $       18.75  $        9.37  $        9.37
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
</TABLE>
 
See notes to financial statements
 
                              Schedule V - Page 2
<PAGE>
                    STATEMENTS OF PARTNERS' EQUITY (DEFICIT)
 
<TABLE>
<CAPTION>
                                                                     LIMITED
                                                                    PARTNERS      GENERAL PARTNER      TOTAL
                                                                 ---------------  ---------------  --------------
<S>                                                              <C>              <C>              <C>
Balance, January 1, 1993.......................................   $  25,983,981    $     (27,488)  $   25,956,493
Distributions..................................................      (1,825,475)         (96,077)      (1,921,552)
Earnings.......................................................       1,355,338           71,335        1,426,673
                                                                 ---------------  ---------------  --------------
 
Balance, December 31, 1993.....................................      25,513,844          (52,230)      25,461,614
Distributions..................................................      (2,123,512)        (111,764)      (2,235,276)
Earnings.......................................................       1,572,567           82,767        1,655,334
                                                                 ---------------  ---------------  --------------
 
Balance, December 31, 1994.....................................      24,962,899          (81,227)      24,881,672
Distributions..................................................      (2,235,276)        (117,648)      (2,352,924)
Earnings.......................................................       1,791,015           94,264        1,885,279
                                                                 ---------------  ---------------  --------------
 
Balance, December 31, 1995.....................................      24,518,638         (104,611)      24,414,027
Distributions (unaudited)......................................      (1,117,638)         (58,824)      (1,176,462)
Earnings (unaudited)...........................................         611,429           32,179          643,608
                                                                 ---------------  ---------------  --------------
 
Balance, June 30, 1996 (unaudited).............................   $  24,012,429    $    (131,256)  $   23,881,173
                                                                 ---------------  ---------------  --------------
                                                                 ---------------  ---------------  --------------
</TABLE>
 
See notes to financial statements
 
                              Schedule V - Page 3
<PAGE>
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,             SIX MONTHS ENDED JUNE 30,
                                                -------------------------------------------  ---------------------------
                                                    1993           1994           1995                          1996
                                                -------------  -------------  -------------      1995       ------------
                                                                                             -------------
                                                                                              (UNAUDITED)
<S>                                             <C>            <C>            <C>            <C>            <C>
OPERATING ACTIVITIES:
  Earnings....................................  $   1,426,673  $   1,655,334  $   1,885,279  $     821,623  $    643,608
    Adjustments to reconcile earnings to net
     cash provided by operating activities:
      Transaction costs.......................                                                                   420,945
      Depreciation and amortization...........        873,059      1,517,880      1,504,727        795,788       666,793
      Changes in operating accounts:
        Other assets..........................        (41,318)       (50,866)         7,621         90,811        53,735
        Accounts payable and other accrued
         expenses.............................        129,143        (14,540)        47,406         97,231       143,556
                                                -------------  -------------  -------------  -------------  ------------
    Net cash provided by operating
     activities...............................      2,387,557      3,107,808      3,445,033      1,805,453     1,928,637
                                                -------------  -------------  -------------  -------------  ------------
 
INVESTING ACTIVITIES:
  Purchase of and improvements to storage
   centers....................................    (15,476,979)      (588,910)      (147,393)       (37,034)     (194,589)
  Consideration for amortizable assets........       (670,804)      (286,950)
                                                -------------  -------------  -------------  -------------  ------------
    Net cash used in investing activities.....    (16,147,783)      (875,860)      (147,393)       (37,034)     (194,589)
                                                -------------  -------------  -------------  -------------  ------------
 
FINANCING ACTIVITIES:
  Proceeds from notes payable.................      8,865,000      9,500,000                                   1,274,000
  Payments on notes payable...................       (865,000)    (9,375,275)      (873,871)      (476,616)   (1,686,356)
  Payments of loan costs......................       (127,846)      (242,226)
  Distributions to partners...................     (1,921,552)    (2,235,276)    (2,352,924)    (1,176,462)   (1,176,462)
  Payment of transaction costs................                                                                  (125,013)
                                                -------------  -------------  -------------  -------------  ------------
    Net cash (used in) provided by financing
     activities...............................      5,950,602     (2,352,777)    (3,226,795)    (1,653,078)   (1,713,831)
                                                -------------  -------------  -------------  -------------  ------------
 
  Increase (decrease) in cash and cash
   equivalents................................     (7,809,624)      (120,829)        70,845        115,341        20,217
  Cash and cash equivalents at beginning of
   year.......................................      8,532,738        723,114        602,285        602,285       673,130
                                                -------------  -------------  -------------  -------------  ------------
  Cash and cash equivalents at end of year....  $     723,114  $     602,285  $     673,130  $     717,626  $    693,347
                                                -------------  -------------  -------------  -------------  ------------
                                                -------------  -------------  -------------  -------------  ------------
 
SUPPLEMENTAL DISCLOSURE OF CASH FLOW
 INFORMATION:
  Cash paid during year for interest..........  $     113,247  $     776,498  $     940,442  $     423,278  $    413,167
                                                -------------  -------------  -------------  -------------  ------------
                                                -------------  -------------  -------------  -------------  ------------
 
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING
 ACTIVITIES:
  Liabilities incurred in connection with the
   purchase of storage centers................  $   2,821,000  $     674,000  $    --        $    --        $    --
                                                -------------  -------------  -------------  -------------  ------------
                                                -------------  -------------  -------------  -------------  ------------
</TABLE>
 
See notes to financial statements
 
                              Schedule V - Page 4
<PAGE>
                         NOTES TO FINANCIAL STATEMENTS
 
NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
    GENERAL:  IDS/Shurgard Income Growth Partners L.P. III (the Partnership) was
organized  under the laws  of the State  of Washington on  November 15, 1988, to
serve as a vehicle for investments in and ownership of a professionally  managed
real  estate  portfolio  consisting  of self  storage  properties  which provide
month-to-month leases  for  business  and personal  use.  The  Partnership  will
terminate  December 31, 2030, unless terminated  at an earlier date. The general
partner is Shurgard Associates L.P. III, a Washington limited partnership.
 
    As of June 30, 1996, there were approximately 3,880 limited partners in  the
Partnership.  There  were  approximately 119,215  units  of  limited partnership
interest outstanding at a contribution of $250 per unit.
 
    The  preparation  of  financial  statements  in  conformity  with  generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions that affect the reported amounts of revenue and expenses during  the
reporting period. Actual results can differ from those estimates.
 
    The  interim financial statements included in  this report are unaudited. In
the  opinion  of  the  Partnership,   all  adjustments  necessary  for  a   fair
presentation  of such financial statements  have been included. Such adjustments
consisted only of normal  recurring items. Interim  results are not  necessarily
indicative of results for a full year.
 
    CASH EQUIVALENTS:  Cash equivalents consist of money market instruments with
original maturities of 90 days or less.
 
    STORAGE  CENTERS:  Storage centers,  including land, buildings and equipment
are recorded at cost. Depreciation on  buildings and equipment is recorded on  a
straight-line  basis over their estimated useful lives which range from three to
thirty years.
 
    AMORTIZABLE ASSETS:  Amortizable assets, consisting primarily of non-compete
covenants and loan costs, are amortized over their expected useful lives of  two
to eight years.
 
    RENTAL  REVENUE:    Rental revenue  is  recognized as  earned  under accrual
accounting principles.
 
    TAXES ON INCOME:   The financial statements do  not reflect a provision  for
Federal income taxes because such taxes are the responsibility of the individual
partners.
 
    LITIGATION:   The Partnership has a  policy of accruing for probable losses,
which if any, could be material to  the future financial position or results  of
operations.  As of June 30, 1996, there  are currently no known probable losses,
therefore, no such accruals have been made.
 
    EARNINGS PER UNIT  OF LIMITED PARTNERSHIP  INTEREST:  Earnings  per unit  of
limited  partnership  interest is  based on  earnings  allocated to  the limited
partners divided by the number  of limited partnership units outstanding  during
the  year (119,215 units for each of the three years ended December 31, 1995 and
the six months ended June 30, 1995 and 1996).
 
    DISTRIBUTIONS PER UNIT OF LIMITED  PARTNERSHIP INTEREST:  Distributions  per
unit of limited partnership interest is based on the total amount distributed to
limited  partners divided by the number of limited partnership units outstanding
during the year (119,215 units  for each of the  three years ended December  31,
1995 and the six months ended June 30, 1995 and 1996).
 
    VALUATION  OF LONG LIVED ASSETS:   The Partnership, using its best estimates
based on reasonable and supportable assumptions and projections, reviews storage
centers  and  other  assets  for  impairment  whenever  events  or  changes   in
circumstances  have indicated that the carrying  amounts of its assets might not
be recoverable. Impaired assets are reported at the lower of cost or fair value.
Assets to be disposed  of are reported  at the lower of  cost or net  realizable
value. At June 30, 1996, no assets had been written down.
 
                              Schedule V - Page 5
<PAGE>
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
NOTE B -- STORAGE CENTERS
    Storage centers consist of the following:
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                         ------------------------------
                                                              1994            1995
                                                         --------------  --------------
                                                                                         JUNE 30, 1996
                                                                                         --------------
                                                                                          (UNAUDITED)
                                                                                         --------------
<S>                                                      <C>             <C>             <C>
Land...................................................  $    7,515,406  $    7,503,081  $    7,503,081
Buildings..............................................      29,110,884      29,238,967      29,433,556
Equipment..............................................         668,167         699,802         699,802
                                                         --------------  --------------  --------------
                                                             37,294,457      37,441,850      37,636,439
Less accumulated depreciation..........................      (2,173,311)     (3,295,350)     (3,859,355)
                                                         --------------  --------------  --------------
                                                         $   35,121,146  $   34,146,500  $   33,777,084
                                                         --------------  --------------  --------------
                                                         --------------  --------------  --------------
</TABLE>
 
NOTE C -- NOTES PAYABLE
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31,
                                                         ------------------------------
                                                              1994            1995
                                                         --------------  --------------
                                                                                         JUNE 30, 1996
                                                                                         --------------
                                                                                          (UNAUDITED)
                                                                                         --------------
<S>                                                      <C>             <C>             <C>
Notes payable to sellers...............................  $    2,264,000  $    1,583,653  $     --
Note payable to bank...................................       9,355,725       9,162,201      10,333,498
                                                         --------------  --------------  --------------
                                                         $   11,619,725  $   10,745,854  $   10,333,498
                                                         --------------  --------------  --------------
                                                         --------------  --------------  --------------
</TABLE>
 
    On  March 31, 1994,  the Partnership consolidated  outstanding notes payable
totaling $8 million and  borrowed an additional $1.5  million. The new terms  of
this note provide the Partnership the option to borrow an additional $3 million.
This  note is secured by real estate and  bears interest at 8%. The note matures
April 1, 2001 and requires monthly payments of principal and interest based on a
twenty-year  amortization.  The  note  reprices  to  market  every  six  months,
accordingly, the recorded value approximates fair value.
 
    Notes  to sellers,  which mature December  31, 1996, are  secured by certain
storage centers of the Partnership. The  recorded value of these seller's  notes
approximates fair value. Annual payments of principal are due 90 days after year
end  under  conditions provided  in the  note agreement  based on  each center's
performance. Quarterly  interest  is payable  to  the extent  any  center's  net
operating income, as defined, exceeds 10% of the Partnership's investment in the
related  center. In  1995 and 1994,  the Partnership made  principal payments of
$680,347 and $651,000 respectively,  on these notes. On  February 29, 1996,  the
Partnership  borrowed  $600,000 on  its bank  note to  partially fund  the final
payment of $909,653 on  the seller's note that  originated with the purchase  of
the  Castro Valley storage center and  to replenish cash reserves. Maturities of
notes payable include this final payment made February 29, 1996.
 
    Maturities of notes payable at December 31, 1995, are as follows:
 
<TABLE>
<S>                                                             <C>
1996..........................................................  $ 1,798,135
1997..........................................................      233,730
1998..........................................................      254,705
1999..........................................................      277,563
2000..........................................................      302,472
Thereafter....................................................    7,879,249
                                                                -----------
                                                                $10,745,854
                                                                -----------
                                                                -----------
</TABLE>
 
                              Schedule V - Page 6
<PAGE>
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
NOTE D -- ACQUISITION
    During the years ended December 31, 1993 and 1994, the Partnership  acquired
existing  storage  centers from  unaffiliated  parties. These  acquisitions were
funded through  a combination  of bank  notes, seller  notes and  cash.  Certain
information about these acquisitions is as follows:
 
<TABLE>
<CAPTION>
                                              PROPERTY            ACQUISITION
             FACILITY                         LOCATION               PRICE              DATE
- -----------------------------------  ---------------------------  -----------  -----------------------
<S>                                  <C>                          <C>          <C>
Castro Valley (1)                    Castro Valley, CA              5,000,000  August, 1993
Newark (1)                           Newark, CA                     3,340,000  August, 1993
San Leandro (1)                      San Leandro, CA                2,671,000  August, 1993
Tracy (1)                            Tracy, CA                      2,250,000  August, 1993
Sacramento (1)                       Sacramento, CA                 2,834,000  February, 1994
San Lorenzo (1)                      San Lorenzo, CA                2,905,000  February, 1994
Castro Valley Office Bldg. (2)       Castro Valley, CA                500,000  May, 1994
</TABLE>
 
- ------------------------
(1) These  purchases were funded with  cash, a $8 million  bank note, and $3.495
    million in seller notes.
 
(2) This purchase was funded with cash.
 
    The transactions  were  accounted  for  as purchases,  and  the  results  of
operations  for each  of the storage  centers from  their respective acquisition
date have  been  included  in  the financial  statements.  The  general  partner
estimates  that if  these properties  had been acquired  on January  1, 1994 and
1993, the pro forma combined results of operations for the year would have  been
as follows:
 
<TABLE>
<CAPTION>
                                                                                1993           1994
                                                                            -------------  -------------
                                                                                    (UNAUDITED)
<S>                                                                         <C>            <C>
Total revenue.............................................................  $   6,237,005  $   6,773,234
Earnings..................................................................  $   1,331,884  $   1,613,010
Earnings per unit of limited partnership interest.........................  $       10.61  $       12.85
</TABLE>
 
    These  pro  forma operating  results  include the  Partnership's  results of
operations, less increased depreciation and amortization on storage centers  and
other assets, respectively, and increased interest expense on the bank loans.
 
    The  pro forma information does not purport  to be indicative of the results
that actually  would have  been obtained  if the  combined operations  had  been
conducted  for the full  year and is not  intended to be  a projection of future
results.
 
NOTE E -- TRANSACTIONS WITH AFFILIATES
    In connection with the management of  the centers, the Partnership has  paid
or accrued a monthly property management fee equal to 6% of the properties gross
revenue  to Shurgard Storage Centers, Inc., an affiliate of the general partner.
On March 24, 1995  Shurgard Incorporated merged  with Shurgard Storage  Centers,
Inc. Prior to the merger date such fees were paid to Shurgard Incorporated.
 
                              Schedule V - Page 7
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
General Partner and Limited Partners
IDS/Shurgard Income Growth Partners L.P. III
Seattle, Washington
 
    We  have  audited the  accompanying  balance sheets  of  IDS/Shurgard Income
Growth Partners L.P.  III as  of December  31, 1994  and 1995,  and the  related
statements  of earnings, partners  equity (deficit), and cash  flows for each of
the three  years  in  the  period  ended  December  31,  1995.  These  financial
statements   are  the  responsibility  of   the  Partnership's  management.  Our
responsibility is to express an opinion  on these financial statements based  on
our audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our opinion, such  financial statements present  fairly, in all material
respects, the financial position of the Partnership as of December 31, 1994  and
1995  and the results of its operations and its cash flows for each of the three
years in  the  period ended  December  31,  1995 in  conformity  with  generally
accepted accounting principles.
 
Deloitte & Touche LLP
Seattle, Washington
March 1, 1996
 
                              Schedule V - Page 8
<PAGE>
SCHEDULE VI IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
                                  SCHEDULE VI
          MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                  AND RESULTS OF OPERATIONS OF THE PARTNERSHIP
 
RESULTS OF OPERATIONS -- SIX MONTHS ENDED JUNE 30, 1996, AND 1995
 
    The Partnership's earnings from operations for the six months ended June 30,
1995 increased $213,000 over the same period in 1995. Rental revenue for the six
months  ended June 30, 1996  also increased $162,000 over  the same periods last
year. The increase resulted primarily from  a 5% increase in the average  rental
rate  per square foot. During the month  of March, the Partnership lost its only
tenant in the  Castro Valley office  building representing approximately  $5,000
per  month in rent.  Management is currently  making efforts to  fill the office
space. Due in part to this  office space vacancy, average occupancies  decreased
eight percentage points from 90% at June 30, 1995 to 82% at June 30, 1996.
 
    Total  expenses decreased  $50,800 for the  six months ended  June 30, 1996,
compared to the same period in 1995. The majority of this decrease is due to the
drop in amortization expense which does not affect the Partnership's cash  flow.
Operating and administration expenses increased $52,300 for the six months ended
June  30, 1996, compared  to the same  period in 1995  due to 1)  an increase in
personnel costs associated with  additional hours worked  by store managers  and
increased  salaries, 2)  an increase  in marketing  costs in  the Atlanta market
reflecting increased yellow page advertisement and 3) an increase in the Georgia
state taxes.  Additionally, real  estate  taxes increased  $17,000 for  the  six
months  ended June  30, 1996,  mainly due  to a  tax assessment  increase at the
Gilbert storage center. Subsequent to June 30, 1996, a fire at the Tracy storage
center  completely  burned  four  units  and  effected  approximately  seventeen
additional units. All costs related to the fire are expected to be covered under
insurance after a $10,000 deductible.
 
RESULTS OF OPERATIONS -- YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993
 
    From  1993  to  1995,  the  Partnership's  revenue  and  expenses  increased
primarily due to the acquisition of new storage centers and the interest on  the
corresponding  debt.  The Partnership  acquired  the following  storage centers:
Sacramento and San Lorenzo (February  1994); Castro Valley Office Building  (May
1994); Castro Valley, Newark, San Leandro and Tracy (August 1993).
 
    The Partnership's rental revenue and earnings from 1994 to 1995 increased 9%
and  14%, respectively,  resulting from a  10.7% increase in  the average rental
rate per  square foot.  Rate increases  were partially  offset by  a decline  in
occupancies  from 93% at December 31, 1993 to 90% at December 31, 1994 to 88% at
December 31,  1995.  Although the  average  occupancy for  the  Partnership  has
decreased, the Partnership seeks to maximize revenue by adjusting rents to match
demand  more flexibly. Store managers evaluate their store's rental rates, based
on unit demand, unit availability and competitors' rental rates. The Partnership
trains its store managers  in revenue optimization and  empowers them to  adjust
marginal  rental rates  based on  their "on the  ground" analysis  of demand and
availability at their particular store.  In addition, the use of  month-to-month
leases,  combined with customer turnover, allows rents to be quickly adjusted to
match current demand in a flexible manner.
 
    Revenue for the  three storage centers  purchased in 1994  increased 20%  or
$156,000  in 1995 over  their 1994 results,  while comparable operating expenses
increased by 5% or $15,000. These combined to provide a 32% or $141,000 increase
in 1995 earnings  for these centers  compared to their  1994 operating  results.
These   increases  resulted  from  the  additional  two  months  of  operations.
Occupancies for  these  three centers,  which  averaged 91%  during  1994,  rose
slightly to an average of 92% during 1995.
 
    Revenue  and operating  expenses for the  four properties  purchased in 1993
rose 161% or $1.3 million and 145% or $415,000 from 1993 to 1994,  respectively.
These increases reflect the additional
 
                              Schedule VI - Page 1
<PAGE>
seven months of operations in 1994. Additionally, revenue and expenses increased
8%  or $173,000 and 4% or $26,000 from 1994 to 1995, respectively. This provided
a 11%  increase in  1995 earnings  for these  centers compared  to 1994.  Annual
occupancies  for these four centers  averaged 91%, 90%, and  91% at December 31,
1993, 1994 and 1995, respectively.
 
    Storage centers owned prior to 1993  had increased revenue of 14% from  1993
to  1994 and 8% from 1994 to  1995. Operating expenses for these storage centers
increased 8% or $126,000 in 1995 over 1994. The majority of this increase is due
to additional hours worked by  managers, higher repair and maintenance  expenses
which  included retail renovations  at the Tucker  facility, and increased store
inventory costs. Additionally operating expenses increased 3% in 1994 over 1993.
Annual occupancies for these storage centers averaged 94% at December 31,  1993,
89% at December 31, 1994, and 85% December 31, 1995.
 
LIQUIDITY AND CAPITAL RESOURCES -- SIX MONTHS ENDED JUNE 30, 1996 AND 1995
 
    TRANSACTION  COSTS.  On July 1, 1996,  the Partnership entered into a merger
agreement with the Purchaser  and two affiliated  Partnerships whereby: (1)  the
Purchaser  would commence  a cash  tender offer  for up  to 52,000  Units of the
Partnership and (2) following  completion of the  tender offer, the  Partnership
would  seek the  requisite approval  by the limited  partners to  merge into the
Purchaser. Upon consummation of  the merger all  limited partners would  receive
stock in the Purchaser.
 
    In  connection with this  transaction, the Partnership  is expected to incur
approximately $930,100 in costs. As of June 30, 1996, transaction costs totaling
approximately $420,900 have been posted  as expenses on the Partnership's  books
(of  which approximately $125,000 has already been  paid). In the event that the
merger is not consummated, the Partnership will bear certain expenses as defined
in the merger agreement.
 
    Due to  this transaction,  Partnership distributions  have been  temporarily
suspended. Upon completion of the merger, a final cash distribution will be made
from  the Partnership in an  amount, if any, by  which the Partnership's Closing
Net Asset Value exceeds its Net Asset Value as defined in the merger  agreement.
This  distribution will be received only  by those who were partners immediately
prior to the merger.
 
    INVESTING ACTIVITIES:  Capital  improvements for the  six months ended  June
30,  1996  totaled  $194,600  which largely  represents  conversion  of existing
storage units to climate  controlled units at the  Dobson Ranch storage  center,
which will increase the revenue potential of the property.
 
    FINANCING  ACTIVITIES:  During 1996,  the Partnership borrowed $1,274,000 on
its bank  note  in order  to  make final  payments  totaling $1,584,000  on  the
seller's  notes that originated with the purchase of certain northern California
storage centers. For the  six months ended June  30, 1995, the Partnership  made
payments totaling $378,000 on the seller's notes pertaining to the Castro Valley
and Newark storage centers.
 
    DISTRIBUTIONS TO PARTNERS:  Annualized distribution rates were 7.50% for the
six months ended June 30, 1996 and 1995.
 
LIQUIDITY AND CAPITAL RESOURCES -- YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993
 
    CASH  FROM OPERATIONS:  Cash from operations increased by $720,300 from 1993
to 1994 and  $337,200 from 1994  to 1995, reflecting  the increase in  earnings.
Management  believes that  cash balances and  cash flow from  operations will be
adequate to support the future operating needs of the Partnership.
 
    INVESTING ACTIVITIES:    In  1993,  the  Partnership  invested  $237,000  in
existing  storage  centers,  including  office  remodeling  at  Norcross,  Stone
Mountain, Tucker and Forest Park and  new signage at Rochester. The  Partnership
also  purchased four storage centers during the third quarter of 1993 at a total
cost of  $13.3 million.  The Partnership  acquired a  security interest  in  two
additional  properties as  part of  a binding  purchase agreement  with the same
seller. These two centers were purchased on
 
                              Schedule VI - Page 2
<PAGE>
February 10, 1994, for $5.7 million.  All six California properties are  subject
to  similar  terms under  the purchase  and  sales agreements.  These agreements
provide the  Partnership a  10% return  on funds  invested for  the first  three
years.  All of  these storage  centers are  located in  northern California, San
Francisco Bay and Sacramento areas and they range in size from 58,000 to  69,000
net rentable square feet. Additionally, in March 1994, the Partnership purchased
an office building from the same seller at a total cost of $500,000.
 
    In  1994,  the Partnership  invested $157,000  in existing  storage centers.
These improvements included new  signage at Castro  Valley, Newark, San  Leandro
and  Tracy. Security  improvements were also  made at the  Gilbert Dobson Ranch,
Castro Valley, Newark and Tracy storage  centers. As part of Stone Mountain  and
Forest  Park's original acquisitions, the  Partnership acquired undeveloped land
in Atlanta adjacent  to each  storage center.  The Partnership  has listed  both
parcels with a local real estate broker for resale.
 
    During 1995, the Partnership invested $147,000 in capital improvements which
included  pavement work  at the Gilbert,  Allen Boulevard  and Rochester storage
centers, as  well as  a new  perimeter fence  at the  Windcrest storage  center.
Additionally, the septic system at the Delray Beach storage center was replaced.
Planned  improvements for 1996 total approximately  $188,600 and are expected to
be funded from operations and cash reserves.
 
    FINANCING ACTIVITIES:   During 1993, the  Partnership issued $10,821,000  of
debt  in conjunction  with the purchase  of the  six storage centers  in the San
Francisco area.  This  debt  was  comprised  of an  $8  million  bank  note  and
$2,821,000  in seller notes. Seller's  notes require quarterly interest payments
to the extent any center's net operating income, as defined, exceeds 10% of  the
Partnership's  investment in the  related center. Annual  payments are due under
conditions provided in the note agreement based on each center's performance.
 
    During 1994, the Partnership consolidated existing outstanding notes payable
totaling $8  million and  borrowed an  additional $1.5  million. This  new  note
matures  April 1, 2001 and bears an interest rate of 8% until September 1, 1996,
at which  time  it  reprices  and  can be  fixed  for  various  periods  at  the
Partnership's  option. Cash  proceeds from  the additional  borrowing under this
note were used to make $580,000 in payments on the seller's notes taken in  1993
and  fund the $500,000 purchase price of  the Castro Valley office building. The
terms of  this note  provide  the Partnership  the option  to  borrow up  to  an
additional  $3 million. It may be necessary  for the Partnership to borrow under
this provision to meet the future repayment obligations of the seller's notes to
the extent  they  cannot  be funded  from  operating  cash flow.  In  1994,  the
Partnership  made  the final  payments of  $651,000 on  the seller's  notes that
originated with the purchase of the Tracy and San Leandro storage centers.
 
    In 1995, the Partnership made a  $65,347 payment on the seller's note  which
originated  with the  purchase of  the Castro Valley  storage center  as well as
final payment  of  $615,000 on  the  seller's  note which  originated  with  the
purchase of the Newark storage center.
 
    DISTRIBUTIONS TO PARTNERS:  Annualized distribution rates were 7.5%, 7.125%,
and 6.125% for 1995, 1994 and 1993, respectively.
 
                              Schedule VI - Page 3
<PAGE>
SCHEDULE VII IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
                                  SCHEDULE VII
                  PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS
 
    The  following pro forma consolidated balance sheets as of June 30, 1996 set
forth the effect of the Transaction  and Additional Transactions as if such  had
occurred  on June 30,  1996. The following pro  forma consolidated statements of
income for  the six  months ended  June 30,  1996 set  forth the  effect of  the
Transaction  and Additional Transactions  as if such had  occurred on January 1,
1995. The following  pro forma consolidated  statements of income  for the  year
ended December 31, 1995 set forth the effect of certain material transactions of
the  Purchaser not related to the Transaction or Additional Transactions and the
effect of the Transaction and Additional Transactions as if such had occurred on
January 1, 1995. The Transaction  and Additional Transactions will be  accounted
for  under  the purchase  method of  accounting  for business  combinations. The
purchase price of the Transaction and Additional Transactions will be  allocated
as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS)                                                       IDS1       IDS2        IDS3        TOTAL
                                                                   ---------  ---------  ----------  -----------
<S>                                                                <C>        <C>        <C>         <C>
Storage centers, at appraised value..............................  $  40,370  $  30,520  $   50,890  $   121,780
Cash, cash equivalents and other assets..........................      1,004        576         889        2,469
Accounts payable and other liabilities...........................     (1,307)    (1,403)     (1,797)      (4,507)
Notes payable....................................................         --     (2,831)    (10,333)     (13,164)
                                                                   ---------  ---------  ----------  -----------
  Total purchase price...........................................  $  40,067  $  26,862  $   39,649  $   106,578
                                                                   ---------  ---------  ----------  -----------
                                                                   ---------  ---------  ----------  -----------
</TABLE>
 
    These  pro  forma consolidated  financial  statements are  presented  in two
scenarios: (a)  the  purchase  by  the  Purchaser  through  the  Offer  and  the
Additional Offers of 29,640, 23,022 and 23,843 of the outstanding units of IDS1,
IDS2  and  IDS3,  respectively  (representing  approximately  20%  of  the total
outstanding units) and (b) the purchase  by the Purchaser of 65,000, 49,000  and
52,000   of  the  outstanding  units  of   IDS1,  IDS2  and  IDS3,  respectively
(representing the maximum number of units that may be acquired by the  Purchaser
through  the  Offer  and  the Additional  Offers).  The  pro  forma consolidated
financial statements  assume that  all of  the Partnerships  participate in  the
Mergers.
 
    The   pro  forma  consolidated  financial  statements  are  not  necessarily
indicative of  what the  Purchaser's  actual financial  position or  results  of
operations  would have been as of the date  or for the periods indicated, nor do
they purport  to represent  the  Purchaser's financial  position or  results  of
operations  as of or for any future period. The pro forma consolidated financial
statements should be read in conjunction with all financial statements  included
elsewhere herein or incorporated by reference in this Offer to Purchase.
 
                             Schedule VII - Page 1
<PAGE>
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                             20% TENDER ASSUMPTION
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                          PURCHASER
                                PURCHASER    PURCHASER    PRE-MERGER      IDS1         IDS2         IDS3
(IN THOUSANDS)                  HISTORICAL  ADJUSTMENTS (1) PRO FORMA  HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (5)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
<S>                             <C>         <C>           <C>          <C>          <C>          <C>          <C>
Storage centers, net..........  $549,658      $--          $549,658     $28,270      $24,547      $33,979      $ 37,068
Other real estate
 investments..................    25,127       20,072(2)     45,199       --           --           --          (22,521)
Cash, cash equivalents and
 other assets.................    56,777        1,358(3)     58,135       1,137          650        1,152          (790)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total assets..............  $631,562      $21,430      $652,992     $29,407      $25,197      $35,131      $ 13,757
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
Accounts payable and other
 liabilities..................  $ 57,881       --          $ 57,881     $   710      $   924      $   917      $  1,545
Notes payable.................   132,250       21,430(4)    153,680       --           2,831       10,333        --
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total liabilities.........   190,131       21,430       211,561         710        3,755       11,250         1,545
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
Minority interest.............     2,561       --             2,561       2,449        --           --           (2,449)
Stockholders' equity..........   438,870       --           438,870      26,248       21,442       23,881        14,661
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total liabilities and
     stockholders' equity.....  $631,562      $21,430      $652,992     $29,407      $25,197      $35,131      $ 13,757
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
 
<CAPTION>
                                 PURCHASER
                                POST-MERGER
(IN THOUSANDS)                   PRO FORMA
                                -----------
<S>                             <C>
Storage centers, net..........   $673,522
Other real estate
 investments..................     22,678
Cash, cash equivalents and
 other assets.................     60,284
                                -----------
    Total assets..............   $756,484
                                -----------
                                -----------
Accounts payable and other
 liabilities..................   $ 61,977
Notes payable.................    166,844
                                -----------
    Total liabilities.........    228,821
                                -----------
Minority interest.............      2,561
Stockholders' equity..........    525,102
                                -----------
    Total liabilities and
     stockholders' equity.....   $756,484
                                -----------
                                -----------
</TABLE>
 
- ----------------------------------
(1)  Purchaser Adjustments  reflect the  purchase of  29,640, 23,022  and 23,843
    Units of IDS1, IDS2 and IDS3, for $257, $222 and $308 per unit, respectively
    ("Tendered Units"), as if such occurred on January 1, 1995.
 
(2) Amount reflects Purchaser's acquisition of the Tendered Units.
 
(3) Amount reflects funds borrowed to  pay the unpaid amount of the  Purchaser's
    estimated costs of $2,300,000 related to the Mergers and the Offers.
 
(4)  Amount reflects the additional debt incurred to finance the purchase of the
    Tendered Units and the Purchaser's estimated transaction costs.
 
(5) Adjustments by Partnerships are as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS)                                                       IDS1       IDS2       IDS3     ADJUSTMENTS
- -----------------------------------------------------------------  ---------  ---------  ---------  -----------
<S>                                                                <C>        <C>        <C>        <C>
Storage centers, net.............................................  $  14,184(a) $   5,973 $  16,911  $  37,068(c)
Other real estate investments....................................    (10,066)    (5,111)    (7,344)    (22,521)(d)
Cash, cash equivalents and other assets..........................       (126)      (207)      (457)       (790)(e)
Accounts payable and other liabilities...........................        515        345        685(b)      1,545(f)
Minority interest................................................     (2,449)    --         --          (2,449)(g)
Stockholders' equity.............................................      5,926        310      8,425      14,661(h)
</TABLE>
 
       -----------------------------------------
       (a) Adjustment includes only  70% of the step-up  to market value of  SJP
        II's  storage centers  as the remaining  30% was owned  by the Purchaser
        prior to the Mergers and will continue to be carried at the  Purchaser's
        historical cost.
 
       (b)  Historical amount has been adjusted to include $176,000 of estimated
        costs to complete  the expansion of  Dobson Ranch, the  market value  of
        which was included in the Appraisal.
 
       (c)  Amount reflects  market value of  self storage centers  based on the
        Appraisals.
 
       (d) Historical amounts have been adjusted to eliminate the Tendered Units
        and the Purchaser's 30% interest in SJP II.
 
       (e) Historical  assets have  been reduced  to eliminate  (i)  amortizable
        assets  which  were specifically  excluded from  the calculation  of Net
        Asset Value per the Acquisition Agreement,  and (ii) cash that would  be
        payable  to  Unitholders  at  the time  of  the  Mergers  as liquidating
        distributions of  $113,000, $134,000  and $196,000  for IDS1,  IDS2  and
        IDS3, respectively. The actual amounts of such liquidating distributions
        may  be greater than or  less than pro forma  amounts depending upon the
        actual amount of transaction costs incurred by each Partnership and  the
        Partnerships'  results of  operations prior  to the  consummation of the
        Mergers.
 
       (f)  Historical  amounts   have  been  adjusted   to  include   estimated
        liabilities for unaccrued Partnership transaction costs. See "The Offer"
        -- Section 10 ("Fees and Expenses").
 
       (g)  Amount  reflects elimination  of  minority interest  related  to the
        Purchaser's 30% interest in SJP II.
 
       (h) Amount reflects  step-up to  Net Asset Value  less the  value of  the
        Tendered Units.
 
                             Schedule VII - Page 2
<PAGE>
                 PRO FORMA CONSOLIDATED STATEMENT OF NET INCOME
                             20% TENDER ASSUMPTION
                         SIX MONTHS ENDED JUNE 30, 1996
<TABLE>
<CAPTION>
                                                          PURCHASER
(IN THOUSANDS, EXCEPT SHARE     PURCHASER    PURCHASER    PRE-MERGER     IDS1         IDS2         IDS3
DATA)                           HISTORICAL  ADJUSTMENTS (1) PRO FORMA HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (5)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
<S>                             <C>         <C>           <C>         <C>          <C>          <C>          <C>
Rental revenue................  $   48,513     $--        $  48,513    $ 3,278      $ 2,255      $ 3,673      $  --
Revenue from other real estate
 investments..................         895       591(2)       1,486      --           --           --              (733)
Property management revenue...       1,734     --             1,734      --           --           --              (673)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total revenue.............      51,142       591         51,733      3,278        2,255        3,673         (1,406)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Operating expense.............      14,192     --            14,192        757          506          919              4
Property management fees......      --         --            --            197          135          219           (551)
Depreciation and
 amortization.................      10,399        38(3)      10,437        520          464          667             81
Real estate taxes.............       4,190     --             4,190        252          174          273         --
General and administrative....       2,244     --             2,244        136           94          113            (53)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total expenses............      31,025        38         31,063      1,862        1,373        2,191           (519)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Income from operations........      20,117       553         20,670      1,416          882        1,482           (887)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Transaction expenses..........      --         --            --           (425)        (285)        (421)         1,131
Minority interest in income...         (57)    --               (57 )     (142)       --           --               142
Interest and other income.....         302     --               302         18            9           15         --
Interest expense..............      (5,248)     (883)(4)     (6,131 )    --            (139)        (432)             8
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total other income
     (expense)................      (5,003)     (883)        (5,886 )     (549)        (415)        (838)         1,281
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income (loss).............  $   15,114     $(330)     $  14,784    $   867      $   467      $   644      $     394
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income per share..........  $     0.65     $(0.01)    $    0.64
                                ----------  -----------   ----------
                                ----------  -----------   ----------
Weighted average number of
 shares.......................  23,199,023                23,199,023  1,276,768     856,513     1,274,965     3,408,246
                                ----------                ----------  ----------   ----------   ----------   -----------
                                ----------                ----------  ----------   ----------   ----------   -----------
Weighted average number of
 units........................                                         148,202      115,110      119,215        382,527
                                                                      ----------   ----------   ----------   -----------
                                                                      ----------   ----------   ----------   -----------
 
<CAPTION>
                                 PURCHASER
(IN THOUSANDS, EXCEPT SHARE     POST-MERGER
DATA)                            PRO FORMA
                                -----------
<S>                             <C>
Rental revenue................  $   57,719
Revenue from other real estate
 investments..................         753
Property management revenue...       1,061
                                -----------
    Total revenue.............      59,533
                                -----------
Operating expense.............      16,378
Property management fees......      --
Depreciation and
 amortization.................      12,169
Real estate taxes.............       4,889
General and administrative....       2,534
                                -----------
    Total expenses............      35,970
                                -----------
Income from operations........      23,563
                                -----------
Transaction expenses..........      --
Minority interest in income...         (57)
Interest and other income.....         344
Interest expense..............      (6,694)
                                -----------
    Total other income
     (expense)................      (6,407)
                                -----------
Net income (loss).............  $   17,156
                                -----------
                                -----------
Net income per share..........  $     0.64
                                -----------
                                -----------
Weighted average number of
 shares.......................  26,607,269
                                -----------
                                -----------
Weighted average number of
 units........................      --
                                -----------
                                -----------
</TABLE>
 
- ----------------------------------
(1)  Purchaser Adjustments recognize the acquisition of the Tendered Units as if
    such had occurred on January 1, 1995.
 
(2) Amount reflects the Purchaser's  20% interest in the Partnerships'  earnings
    allocated to the Unitholders.
 
(3)  Amounts reflects  amortization of  transaction costs  of $2.3  million on a
    straight-line basis over 30 years.
 
(4) Amount reflects interest at 8.25%  per annum on additional debt incurred  to
    finance the acquisition of the Tendered Units and the transaction costs.
 
                             Schedule VII - Page 3
<PAGE>
(5) Adjustments by Partnership are as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS, EXCEPT SHARE DATA)                                IDS1       IDS2       IDS3       TOTAL
- -------------------------------------------------------------  ---------  ---------  ---------  ---------
<S>                                                            <C>        <C>        <C>        <C>
Revenue from other real estate investments...................  $    (388) $    (143) $    (202) $    (733)(a)
Property management revenue..................................       (244)      (168)      (261)      (673)(b)
Operating expense............................................          3          1         --          4(c)
Property management fees.....................................       (197)      (135)      (219)      (551)(d)
Depreciation and amortization................................         75        (37)        43         81(e)
General and administrative...................................        (20)       (14)       (19)       (53)(f)
Transaction expenses.........................................        425        285        421      1,131(g)
Minority interest in income..................................        142         --         --        142(h)
Interest expense.............................................         --          3          5          8(i)
Weighted average number of shares............................  1,276,768    856,513  1,274,965  3,408,246(j)
Weighted average number of units.............................    148,203    115,110    119,215    382,527
- ----------------------------------
(a)   Historical  amounts have been  adjusted to  eliminate the Purchaser's  20% interest  related to the
     Tendered Units and the Purchaser's 30% interest in the earnings of SJP II.
 
(b)  Amount  reflects elimination of  property management fees,  advertising fees (at  $900 per year  per
     storage  center), the Purchaser's interest in the General Partners and administrative reimbursements
     paid to the Purchaser by the Partnerships.
 
(c)  Amount represents elimination of advertising fees paid by the Partnerships to the Purchaser.
 
(d)  Amount reflects elimination of property management fees paid by the Partnerships to the Purchaser.
 
(e)  Amount  reflects the  change in  depreciation of storage  centers. Depreciation  on a  new basis  of
     $97,424  will  be recognized  on  a straight  line  basis over  five  to 30  years.  Amortization of
     amortizable assets has been eliminated as such assets are not included in Net Asset Value.
 
(f)   Amount reflects  elimination  of administrative  reimbursements paid  by  the Partnerships  to  the
     Purchaser.
 
(g)    Amount reflects  elimination of  transaction  expenses as  such costs  have  been included  in the
     calculation of Net Asset Value.
 
(h)  Amount reflects the elimination of the Purchaser's 30% minority interest in the earnings of SJP II.
 
(i)  Amount reflects the refinancing of the debt of the Partnerships at 8.25% per annum.
 
(j)  Weighted average number of shares to be  issued to each Partnership, assuming a $25.00 share  price,
     is calculated as follows:
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  IDS1        IDS2        IDS3
                                                               ----------  ----------  ----------
<S>                                                            <C>         <C>         <C>
Net Asset Value..............................................  $40,066,700 $26,861,846 $39,649,643
Less value of Tendered Units.................................  (7,617,480) (5,110,884) (7,343,644)
Purchaser's interest in General Partner......................    (530,000)   (338,125)   (431,875)
                                                               ----------  ----------  ----------
Consideration allocable to Unitholders participating in the
Merger.......................................................  $31,919,220 $21,412,837 $31,874,124
                                                                 DIVIDED BY   DIVIDED BY   DIVIDED BY
Assumed share price..........................................  25.00       25.00       25.00
                                                               ----------  ----------  ----------
Weighted average number of shares allocable to Unitholders
participating in the Mergers.................................   1,276,768     856,513   1,274,965
                                                               ----------  ----------  ----------
                                                               ----------  ----------  ----------
</TABLE>
 
                             Schedule VII - Page 4
<PAGE>
                 PRO FORMA CONSOLIDATED STATEMENT OF NET INCOME
                             20% TENDER ASSUMPTION
                          YEAR ENDED DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                          PURCHASER
(IN THOUSANDS, EXCEPT SHARE     PURCHASER    PURCHASER    PRE-MERGER     IDS1         IDS2         IDS3
DATA)                           HISTORICAL  ADJUSTMENTS (1) PRO FORMA HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (10)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
<S>                             <C>         <C>           <C>         <C>          <C>          <C>          <C>
Rental revenue................  $   92,397   $   1,984    $  94,381    $ 6,465      $ 4,309      $ 7,225      $  --
Revenue from other real estate
 investments..................       1,396       1,111(2)     2,507      --           --           --            (1,375)
Property management revenue...       2,978         802(3)     3,780      --           --           --            (1,424)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total revenue.............      96,771       3,897      100,668      6,465        4,309        7,225         (2,799)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Operating expense.............      26,171          23(4)    26,194      1,493          944        1,800             24
Property management fees......      --                                     388          258          433         (1,079)
Depreciation and
 amortization.................      17,410         733(5)    18,143      1,114          919        1,505            (75)
Real estate taxes.............       7,596         131(6)     7,727        466          324          506         --
General and administrative....       4,859         684(7)     5,543        216          159          170           (223)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total expenses............      56,036       1,571       57,607      3,677        2,604        4,414         (1,353)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Income from operations........      40,735       2,326       43,061      2,788        1,705        2,811         (1,446)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Minority interest in income...      --          --           --           (264)       --           --               264
Interest and other income.....         885        (368)(8)       517       109           10           35
Interest expense..............     (12,038)         24(9)   (12,014 )     (130)        (254)        (961)           220
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total other income
     (expense)................     (11,153)       (344)     (11,497 )     (285)        (244)        (926)           484
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net (loss) income.............  $   29,582   $   1,982    $  31,564    $ 2,503      $ 1,461      $ 1,885      $    (962)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income per share..........  $     1.43   $    0.79    $    1.36
                                ----------  -----------   ----------
                                ----------  -----------   ----------
Weighted average number of
 shares.......................  20,675,536   2,518,385    23,193,921  1,276,768     856,513     1,274,965     3,408,246
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Weighted average number of
 units........................                                         148,202      115,110      119,215        382,527
                                                                      ----------   ----------   ----------   -----------
                                                                      ----------   ----------   ----------   -----------
 
<CAPTION>
                                 PURCHASER
(IN THOUSANDS, EXCEPT SHARE     POST-MERGER
DATA)                            PRO FORMA
                                -----------
<S>                             <C>
Rental revenue................  $  112,380
Revenue from other real estate
 investments..................       1,132
Property management revenue...       2,356
                                -----------
    Total revenue.............     115,868
                                -----------
Operating expense.............      30,455
Property management fees......      --
Depreciation and
 amortization.................      21,606
Real estate taxes.............       9,023
General and administrative....       5,865
                                -----------
    Total expenses............      66,949
                                -----------
Income from operations........      48,919
                                -----------
Minority interest in income...      --
Interest and other income.....         671
Interest expense..............     (13,139 )
                                -----------
    Total other income
     (expense)................     (12,468 )
                                -----------
Net (loss) income.............  $   36,451
                                -----------
                                -----------
Net income per share..........  $     1.37
                                -----------
                                -----------
Weighted average number of
 shares.......................  26,602,167
                                -----------
                                -----------
Weighted average number of
 units........................
</TABLE>
 
- ----------------------------------
(1)   This  column  details  adjustments  related  to  the  recognition  of  the
    acquisition of the Tendered Units as if such had occurred on January 1, 1995
    and the effect  of the  following transactions as  if such  had occurred  on
    January 1, 1995:
 
     (i) the  merger of Shurgard  Incorporated which occurred  in March 1995 and
         was accounted for as a purchase;
 
    (ii) the acquisition of Shurgard Evergreen Limited Partnership ("Evergreen")
         which occurred  in  May 1995  and  was  accounted for  as  a  purchase.
         Evergreen  owned  7  storage  centers directly  and  an  interest  in 3
         additional stores through a joint venture;
 
   (iii) the sale of  approximately 4.9 million  shares of common  stock of  the
         Purchaser which occurred in June and July 1995; and
 
    (iv) the  acquisition of  four storage centers,  one was  purchased in March
         1995; the others, in summer 1995.
 
    Any additional net income resulting  from the assumption of consummation  of
    these transactions on January 1, 1995 is assumed to have been distributed to
    the Purchaser's stockholders during 1995.
 
(2)  Amount reflects the Purchaser's 20%  interest in the Partnerships' earnings
    allocated to Unitholders.
 
(3) Amounts reflects  increase in property  management fees from  the merger  of
    Shurgard Incorporated.
 
(4) Amount reflects increased operating expenses attributable to the acquisition
    of storage centers.
 
(5) Amount reflects increased depreciation related to the acquisition of storage
    centers  which are  being depreciated  over an  estimated useful  life of 30
    years and the  amortization of  $2.3 million  of transaction  costs over  an
    estimated useful life of 30 years.
 
(6)  Amount reflects increased  real estate taxes related  to the acquisition of
    storage centers.
 
(7) Amount  reflects  increased  expenses  related to  the  merger  of  Shurgard
    Incorporated.
 
(8)  Amount reflects decrease in investment income  as a result of using cash to
    finance the acquisitions described in (1) above.
 
                             Schedule VII - Page 5
<PAGE>
(9) Amount reflects reduction of interest  expense as a result of cash  provided
    by the offering of common stock described in (1) above.
 
(10) Adjustments by Partnership are as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS, EXCEPT SHARE DATA)                              IDS1       IDS2       IDS3     ADJUSTMENTS
- -----------------------------------------------------------  ---------  ---------  ---------  -----------
<S>                                                          <C>        <C>        <C>        <C>
Revenue from other real estate investments.................  $    (740) $    (278) $    (357)  $  (1,375)(a)
Property management revenue................................       (514)      (359)      (551)     (1,424)(b)
Operating expense..........................................         11          8          5          24(c)
Property management fees...................................        388        258        433       1,079(d)
Depreciation and amortization..............................         75        (65)       (85)        (75)(e)
General and administrative.................................        (77)       (70)       (76)       (223)(f)
Minority interest in earnings..............................        264         --         --         264(g)
Interest expense...........................................        130        (18)       108         220(h)
Weighted average number of shares..........................  1,276,768    856,513  1,274,965   3,408,246(i)
                                                             ---------  ---------  ---------  -----------
                                                             ---------  ---------  ---------  -----------
Weighted average number of units...........................    148,202    115,110    119,215     382,527
                                                             ---------  ---------  ---------  -----------
                                                             ---------  ---------  ---------  -----------
</TABLE>
 
       -----------------------------------------
       (a)  Historical amounts have  been adjusted to  eliminate the Purchaser's
        20% interest  related to  the  Tendered Units  and the  Purchaser's  30%
        interest in the earnings of SJP II.
 
       (b)  Amount reflects elimination of property management fees, advertising
        fees (at $900 per year per storage center), the Purchaser's interest  in
        the  General  Partners  and administrative  reimbursements  paid  to the
        Purchaser by the Partnerships.
 
       (c) Amount  represents  elimination  of  advertising  fees  paid  by  the
        Partnerships to the Purchaser.
 
       (d)  Amount reflects elimination of property  management fees paid by the
        Partnerships to the Purchaser.
 
       (e) Amount  reflects  the  change in  depreciation  of  storage  centers.
        Depreciation  on a new basis of $97,424 will be recognized on a straight
        line basis over five to 30 years. Amortization of amortizable assets has
        been eliminated as such assets are not included in Net Asset Value.
 
       (f) Amount reflects elimination of administrative reimbursements paid  by
        the Partnerships to the Purchaser.
 
       (g)  Amount  reflects the  elimination  of the  Purchaser's  30% minority
        interest in the earnings of SJP II.
 
       (h) Amount reflects the  refinancing of the debt  of the Partnerships  at
        8.25% per annum.
 
       (i)   Weighted average number of shares to be issued to each Partnership,
        assuming a $25.00 share price, is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                  IDS1        IDS2        IDS3
                                                               ----------  ----------  ----------
<S>                                                            <C>         <C>         <C>
Net Asset Value..............................................  $40,066,700 $26,861,846 $39,649,643
Less value of Tendered Units.................................  (7,617,480) (5,110,884) (7,343,644)
Purchaser's interest in General Partner......................    (530,000)   (338,125)   (431,875)
                                                               ----------  ----------  ----------
Consideration allocable to Unitholders participating in the
Merger.......................................................  $31,919,220 $21,412,837 $31,874,124
                                                                 DIVIDED BY   DIVIDED BY   DIVIDED BY
Assumed share price..........................................  25.00       25.00       25.00
                                                               ----------  ----------  ----------
Weighted average number of shares allocable to Unitholders
participating in the Merger..................................   1,276,768     856,513   1,274,965
                                                               ----------  ----------  ----------
                                                               ----------  ----------  ----------
</TABLE>
 
                             Schedule VII - Page 6
<PAGE>
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                           MAXIMUM TENDER ASSUMPTION
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                          PURCHASER
                                PURCHASER    PURCHASER    PRE-MERGER      IDS1         IDS2         IDS3
(IN THOUSANDS)                  HISTORICAL  ADJUSTMENTS (1) PRO FORMA  HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (5)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
<S>                             <C>         <C>           <C>          <C>          <C>          <C>          <C>
Storage centers, net..........  $549,658      $--          $549,658     $28,270      $24,547      $33,979      $ 37,068
Other real estate
 investments..................    25,127       43,599(2)     68,726       --           --           --          (46,048)
Cash, cash equivalents and
 other assets.................    56,777        1,358(3)     58,135       1,137          650        1,152          (790)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total assets..............  $631,562      $44,957      $676,519     $29,407      $25,197      $35,131      $ (9,770)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
Accounts payable and other
 liabilities..................  $ 57,881       --          $ 57,881     $   710      $   924      $   917      $  1,545
Notes payable.................   132,250       44,957(4)    177,207       --           2,831       10,333        --
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total liabilities.........   190,131       44,957       235,088         710        3,755       11,250         1,545
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
Minority interest.............     2,561       --             2,561       2,449        --           --           (2,449)
Stockholders' equity..........   438,870       --           438,870      26,248       21,442       23,881        (8,866)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total liabilities and
     stockholders' equity.....  $631,562      $44,957      $676,519     $29,407      $25,197      $35,131      $ (9,770)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
 
<CAPTION>
                                 PURCHASER
                                POST-MERGER
(IN THOUSANDS)                   PRO FORMA
                                -----------
<S>                             <C>
Storage centers, net..........   $673,522
Other real estate
 investments..................     22,678
Cash, cash equivalents and
 other assets.................     60,284
                                -----------
    Total assets..............   $756,484
                                -----------
                                -----------
Accounts payable and other
 liabilities..................   $ 61,977
Notes payable.................    190,371
                                -----------
    Total liabilities.........    252,348
                                -----------
Minority interest.............      2,561
Stockholders' equity..........    501,575
                                -----------
    Total liabilities and
     stockholders' equity.....   $756,484
                                -----------
                                -----------
</TABLE>
 
- ----------------------------------
(1)  Purchaser adjustments  reflect the  purchase of  65,000, 49,000  and 52,000
    Units of IDS1, IDS2 and IDS3, for $257, $222 and $308 per unit, respectively
    ("Maximum Tendered Units"), as if such occurred on January 1, 1995.
 
(2) Amount reflects Purchaser's acquisition of the Tendered Units.
 
(3) Amount reflects funds borrowed to  pay the unpaid amount of the  Purchaser's
    estimated costs of $2,300,000 related to the Mergers and the Offers.
 
(4)  Amount reflects the additional debt incurred to finance the purchase of the
    Tendered Units and the Purchaser's estimated transaction costs.
 
(5) Adjustments by Partnership are as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS)                                                      IDS1       IDS2       IDS3     ADJUSTMENTS
- ----------------------------------------------------------------  ---------  ---------  ---------  -----------
<S>                                                               <C>        <C>        <C>        <C>
Storage centers, net............................................  $  14,184(a) $   5,973 $  16,911  $  37,068(c)
Other real estate investments...................................    (19,154)   (10,878)   (16,016)    (46,048)(d)
Cash, cash equivalents and other assets.........................       (126)      (207)      (457)       (790)(e)
Accounts payable and other liabilities..........................        515        345        685(b)      1,545(f)
Minority interest...............................................     (2,449)    --         --          (2,449)(g)
Stockholders' equity............................................     (3,162)    (5,457)      (247)     (8,866)(h)
</TABLE>
 
       -----------------------------------------
       (a) Adjustment includes only  70% of the step-up  to market value of  SJP
        II's  storage centers  as the remaining  30% was owned  by the Purchaser
        prior to the Mergers and will continue to be carried at the  Purchaser's
        historical cost.
 
       (b)  Historical amount has been adjusted to include $176,000 of estimated
        costs to complete  the expansion of  Dobson Ranch, the  market value  of
        which was included in the Appraisal.
 
       (c)  Amount reflects  market value of  self storage centers  based on the
        Appraisals.
 
       (d) Historical  amounts  have  been adjusted  to  eliminate  the  Maximum
        Tendered Units and the Purchaser's 30% interest in SJP II.
 
       (e)  Historical  assets have  been reduced  to eliminate  (i) amortizable
        assets which  were specifically  excluded from  the calculation  of  Net
        Asset  Value per the Acquisition Agreement,  and (ii) cash that would be
        payable to  Unitholders  at  the  time of  the  Mergers  as  liquidating
        distributions  of  $113,000, $134,000  and $196,000  for IDS1,  IDS2 and
        IDS3, respectively. The actual amounts of such liquidating distributions
        may be greater than  or less than pro  forma amounts depending upon  the
        actual  amount of transaction costs incurred by each Partnership and the
        Partnerships' results of  operations prior  to the  consummation of  the
        Mergers.
 
       (f)   Historical  amounts   have  been  adjusted   to  include  estimated
        liabilities for unaccrued Partnership transaction costs. See "The Offer"
        -- Section 10 ("Fees and Expenses").
 
       (g) Amount  reflects  elimination of  minority  interest related  to  the
        Purchaser's 30% interest in SJP II.
 
       (h)  Amount reflects  step-up to  Net Asset Value  less the  value of the
        Maximum Tendered Units.
 
                             Schedule VII - Page 7
<PAGE>
                 PRO FORMA CONSOLIDATED STATEMENT OF NET INCOME
                           MAXIMUM TENDER ASSUMPTION
                         SIX MONTHS ENDED JUNE 30, 1996
<TABLE>
<CAPTION>
                                                          PURCHASER
(IN THOUSANDS, EXCEPT SHARE     PURCHASER    PURCHASER    PRE-MERGER     IDS1         IDS2         IDS3
DATA)                           HISTORICAL  ADJUSTMENTS (1) PRO FORMA HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (5)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
<S>                             <C>         <C>           <C>         <C>          <C>          <C>          <C>
Rental revenue................  $   48,513    $--         $  48,513    $ 3,278      $ 2,255      $ 3,673      $  --
Revenue from other real estate
 investments..................         895      1,285(2)      2,180      --           --           --            (1,427)
Property management revenue...       1,734     --             1,734      --           --           --              (673)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total revenue.............      51,142      1,285        52,427      3,278        2,255        3,673         (2,100)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Operating expense.............      14,192     --            14,192        757          506          919              4
Property management fees......      --         --            --            197          135          219           (551)
Depreciation and
 amortization.................      10,399         38(3)     10,437        520          464          667             81
Real estate taxes.............       4,190     --             4,190        252          174          273         --
General and administrative....       2,244     --             2,244        136           94          113            (53)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total expenses............      31,025         38        31,063      1,862        1,373        2,191           (519)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Income from operations........      20,117      1,247        21,364      1,416          882        1,482         (1,581)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Transaction expenses..........      --         --            --           (425)        (285)        (421)         1,131
Minority interest in income...         (57)    --               (57 )     (142)       --           --               142
Interest and other income.....         302     --               302         18            9           15         --
Interest expense..............      (5,248)    (1,854)(4)    (7,102 )    --            (139)        (432)             8
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total other income
     (expense)................      (5,003)    (1,854)       (6,857 )     (549)        (415)        (838)         1,281
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income (loss).............  $   15,114    $  (607)    $  14,507    $   867      $   467      $   644      $    (300)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income per share..........  $     0.65    $ (0.03)    $    0.63
                                ----------  -----------   ----------
                                ----------  -----------   ----------
Weighted average number of
 shares.......................  23,199,023  23,199,028    23,199,023   913,268      625,828      928,070      2,467,166
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Weighted average number of
 units........................                                         148,202      115,110      119,215        382,527
                                                                      ----------   ----------   ----------   -----------
                                                                      ----------   ----------   ----------   -----------
 
<CAPTION>
                                 PURCHASER
(IN THOUSANDS, EXCEPT SHARE     POST-MERGER
DATA)                            PRO FORMA
                                -----------
<S>                             <C>
Rental revenue................  $   57,719
Revenue from other real estate
 investments..................         753
Property management revenue...       1,061
                                -----------
    Total revenue.............      59,533
                                -----------
Operating expense.............      16,378
Property management fees......      --
Depreciation and
 amortization.................      12,169
Real estate taxes.............       4,889
General and administrative....       2,534
                                -----------
    Total expenses............      35,970
                                -----------
Income from operations........      23,563
                                -----------
Transaction expenses..........      --
Minority interest in income...         (57)
Interest and other income.....         344
Interest expense..............      (7,665)
                                -----------
    Total other income
     (expense)................      (7,378)
                                -----------
Net income (loss).............  $   16,185
                                -----------
                                -----------
Net income per share..........  $     0.63
                                -----------
                                -----------
Weighted average number of
 shares.......................  25,666,189
                                -----------
                                -----------
Weighted average number of
 units........................
</TABLE>
 
- ----------------------------------
(1) Purchaser  Adjustments recognize  the acquisition  of the  Maximum  Tendered
    Units as if such had occurred on January 1, 1995.
 
(2)  Amount reflects the Purchaser's 20%  interest in the Partnership's earnings
    allocated to the Unitholders.
 
(3) Amounts reflects  amortization of  transaction costs  of $2.3  million on  a
    straight-line basis over 30 years.
 
(4)  Amount reflects interest at 8.25% per  annum on additional debt incurred to
    finance the acquisition of  the Maximum Tendered  Units and the  transaction
    costs.
 
                             Schedule VII - Page 8
<PAGE>
(5) Adjustments by Partnership are as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS, EXCEPT SHARE DATA)                                IDS1       IDS2       IDS3       TOTAL
- -------------------------------------------------------------  ---------  ---------  ---------  ---------
<S>                                                            <C>        <C>        <C>        <C>
Revenue from other real estate investments...................  $    (681) $    (305) $    (441) $  (1,427)(a)
Property management revenue..................................       (244)      (168)      (261)      (673)(b)
Operating expense............................................          3          1         --          4(c)
Property management fees.....................................       (197)      (135)      (219)      (551)(d)
Depreciation and amortization................................         75        (37)        43         81(e)
General and administrative...................................        (20)       (14)       (19)       (53)(f)
Transaction expenses.........................................        425        285        421      1,131(g)
Minority interest in earnings................................        142         --         --        142(h)
Interest expense.............................................         --          3          5          8(i)
Weighted average number of shares............................    913,268    625,828    928,070  2,467,166(j)
Weighted average number of units.............................    148,203    115,110    119,215    382,527
- ----------------------------------
(a)   Historical  amounts have been  adjusted to  eliminate the Purchaser's  20% interest  related to the
     Maximum Tendered Units and the Purchaser's 30% interest in the earnings of SJP II.
 
(b)  Amount  reflects elimination of  property management fees,  advertising fees (at  $900 per year  per
     storage  center), the Purchaser's interest in the General Partners and administrative reimbursements
     paid to the Purchaser by the Partnerships.
 
(c)  Amount represents elimination of advertising fees paid by the Partnerships to the Purchaser.
 
(d)  Amount reflects elimination of property management fees paid by the Partnerships to the Purchaser.
 
(e)  Amount  reflects the  change in  depreciation of storage  centers. Depreciation  on a  new basis  of
     $97,424  will  be recognized  on  a straight  line  basis over  five  to 30  years.  Amortization of
     amortizable assets has been eliminated as such assets are not included in Net Asset Value.
 
(f)   Amount reflects  elimination  of administrative  reimbursements paid  by  the Partnerships  to  the
     Purchaser.
 
(g)    Amount reflects  elimination of  transaction  expenses as  such costs  have  been included  in the
     calculation of Net Asset Value.
 
(h)  Amount reflects the elimination of the Purchaser's 30% minority interest in the earnings of SJP II.
 
(i)  Amount reflects the refinancing of the debt of the Partnerships at 8.25% per annum.
 
(j)  Weighted average number of shares to be  issued to each Partnership, assuming a $25.00 share  price,
     is calculated as follows:
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  IDS1        IDS2        IDS3
                                                               ----------  ----------  ----------
<S>                                                            <C>         <C>         <C>
Net Asset Value..............................................  $40,066,700 $26,861,846 $39,649,643
Less value of Maximum Tendered Units.........................  (16,705,000) (10,878,000) (16,016,000)
Purchaser's interest in General Partner......................    (530,000)   (338,125)   (431,875)
                                                               ----------  ----------  ----------
Consideration allocable to Unitholders participating in the
Merger.......................................................  $22,831,700 $15,645,721 $23,201,768
                                                                 DIVIDED BY   DIVIDED BY   DIVIDED BY
Assumed share price..........................................  25.00       25.00       25.00
                                                               ----------  ----------  ----------
Weighted average number of shares allocable to Unitholders
participating in the Mergers.................................     913,268     625,828     928,070
                                                               ----------  ----------  ----------
                                                               ----------  ----------  ----------
</TABLE>
 
                             Schedule VII - Page 9
<PAGE>
                 PRO FORMA CONSOLIDATED STATEMENT OF NET INCOME
                           MAXIMUM TENDER ASSUMPTION
                          YEAR ENDED DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                          PURCHASER
(IN THOUSANDS, EXCEPT SHARE     PURCHASER    PURCHASER    PRE-MERGER     IDS1         IDS2         IDS3
DATA)                           HISTORICAL  ADJUSTMENTS (1) PRO FORMA HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (10)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
<S>                             <C>         <C>           <C>         <C>          <C>          <C>          <C>
Rental revenue................  $   92,397   $   1,984    $  94,381    $ 6,465      $ 4,309      $ 7,225      $  --
Revenue from other real estate
 investments..................       1,396       2,416(2)     3,812      --           --           --            (2,680)
Property management revenue...       2,978         802(3)     3,780      --           --           --            (1,424)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total revenue.............      96,771       5,202      101,973      6,465        4,309        7,225         (4,104)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Operating expense.............      26,171          23(4)    26,194      1,493          944        1,800             24
Property management fees......      --                                     388          258          433         (1,079)
Depreciation and
 amortization.................      17,410         733(5)    18,143      1,114          919        1,505            (75)
Real estate taxes.............       7,596         131(6)     7,727        466          324          506         --
General and administrative....       4,859         684(7)     5,543        216          159          170           (223)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total expenses............      56,036       1,571       57,607      3,677        2,604        4,414         (1,353)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Income from operations........      40,735       3,631       44,366      2,788        1,705        2,811         (2,751)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Minority interest in income...      --          --           --           (264)       --           --               264
Interest and other income.....         885        (368)(8)       517       109           10           35
Interest expense..............     (12,038)     (1,918)(9)   (13,956 )     (130)       (254)        (961)           220
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total other income
     (expense)................     (11,153)     (2,286)     (13,439 )     (285)        (244)        (926)           484
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net (loss) income.............  $   29,582   $   1,345    $  30,927    $ 2,503      $ 1,461      $ 1,885      $  (2,267)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income per share..........  $     1.43   $    0.53    $    1.33
                                ----------  -----------   ----------
                                ----------  -----------   ----------
Weighted average number of
 shares.......................  20,675,536   2,518,385    23,193,921   913,268      625,828      928,070      2,467,166
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Weighted average number of
 units........................                                         148,202      115,110      119,215        382,527
                                                                      ----------   ----------   ----------   -----------
                                                                      ----------   ----------   ----------   -----------
 
<CAPTION>
                                 PURCHASER
(IN THOUSANDS, EXCEPT SHARE     POST-MERGER
DATA)                            PRO FORMA
                                -----------
<S>                             <C>
Rental revenue................  $  112,380
Revenue from other real estate
 investments..................       1,132
Property management revenue...       2,356
                                -----------
    Total revenue.............     115,868
                                -----------
Operating expense.............      30,455
Property management fees......      --
Depreciation and
 amortization.................      21,606
Real estate taxes.............       9,023
General and administrative....       5,865
                                -----------
    Total expenses............      66,949
                                -----------
Income from operations........      48,919
                                -----------
Minority interest in income...      --
Interest and other income.....         671
Interest expense..............     (15,081 )
                                -----------
    Total other income
     (expense)................     (14,410 )
                                -----------
Net (loss) income.............  $   34,509
                                -----------
                                -----------
Net income per share..........  $     1.34
                                -----------
                                -----------
Weighted average number of
 shares.......................  25,661,087
                                -----------
                                -----------
Weighted average number of
 units........................
</TABLE>
 
- ----------------------------------
(1)   This  column  details  adjustments  related  to  the  recognition  of  the
    acquisition of the Maximum Tendered Units as if such had occurred on January
    1, 1995 and the effect of the following transactions as if such had occurred
    on January 1, 1995:
 
     (i) the merger of Shurgard  Incorporated which occurred  in March 1995  and
         was accounted for as a purchase;
 
    (ii) the acquisition of Shurgard Evergreen Limited Partnership ("Evergreen")
         which  occurred  in  May 1995  and  was  accounted for  as  a purchase.
         Evergreen owned  7  storage  centers  directly and  an  interest  in  3
         additional stores through a joint venture;
 
   (iii) the  sale of  approximately 4.9 million  shares of common  stock of the
         Purchaser which occurred in June and July 1995; and
 
    (iv) the acquisition of  four storage  centers, one was  purchased in  March
         1995; the others, in summer 1995.
 
    Any  additional net income resulting from  the assumption of consummation of
    these transactions on January 1, 1995 is assumed to have been distributed to
    the Purchaser's stockholders during 1995.
 
(2) Amount reflects the Purchaser's  20% interest in the Partnerships'  earnings
    allocated to Unitholders.
 
(3)  Amounts reflects  increase in property  management fees from  the merger of
    Shurgard Incorporated.
 
(4) Amount reflects increased operating expenses attributable to the acquisition
    of storage centers.
 
(5) Amount reflects increased depreciation related to the acquisition of storage
    centers which are  being depreciated  over an  estimated useful  life of  30
    years  and the  amortization of  $2.3 million  of transaction  costs over an
    estimated useful life of 30 years.
 
(6) Amount reflects increased  real estate taxes related  to the acquisition  of
    storage centers.
 
(7)  Amount  reflects  increased  expenses related  to  the  merger  of Shurgard
    Incorporated.
 
(8) Amount reflects decrease in investment income  as a result of using cash  to
    finance the acquisitions described in (1) above.
 
                             Schedule VII - Page 10
<PAGE>
(9)  Amount reflects reduction of interest expense  as a result of cash provided
    by the offering of common stock described in (1) above.
 
(10) Adjustments by Partnership are as follows:
 
<TABLE>
<CAPTION>
(IN THOUSANDS, EXCEPT SHARE DATA)                              IDS1       IDS2       IDS3     ADJUSTMENTS
- -----------------------------------------------------------  ---------  ---------  ---------  -----------
<S>                                                          <C>        <C>        <C>        <C>
Revenue from other real estate investments.................  $  (1,308) $    (591) $    (781)  $  (2,680)(a)
Property management revenue................................       (514)      (359)      (551)     (1,424)(b)
Operating expense..........................................         11          8          5          24(c)
Property management fees...................................        388        258        433       1,079(d)
Depreciation and amortization..............................         75        (65)       (85)        (75)(e)
General and administrative.................................        (77)       (70)       (76)       (223)(f)
Minority interest in earnings..............................        264         --         --         264(g)
Interest expense...........................................        130        (18)       108         220(h)
Weighted average number of shares..........................    913,268    625,828    928,070   2,467,166(i)
                                                             ---------  ---------  ---------  -----------
                                                             ---------  ---------  ---------  -----------
Weighted average number of units...........................    148,202    115,110    119,215     382,527
                                                             ---------  ---------  ---------  -----------
                                                             ---------  ---------  ---------  -----------
</TABLE>
 
       -----------------------------------------
       (a) Historical amounts  have been adjusted  to eliminate the  Purchaser's
        20%  interest related to the Maximum  Tendered Units and the Purchaser's
        30% interest in the earnings of SJP II.
 
       (b) Amount reflects elimination of property management fees,  advertising
        fees  (at $900 per year per storage center), the Purchaser's interest in
        the General  Partners  and  administrative reimbursements  paid  to  the
        Purchaser by the Partnerships.
 
       (c)  Amount  represents  elimination  of  advertising  fees  paid  by the
        Partnerships to the Purchaser.
 
       (d) Amount reflects elimination of  property management fees paid by  the
        Partnerships to the Purchaser.
 
       (e)  Amount  reflects  the  change in  depreciation  of  storage centers.
        Depreciation on a new basis of $97,424 will be recognized on a  straight
        line basis over five to 30 years. Amortization of amortizable assets has
        been eliminated as such assets are not included in Net Asset Value.
 
       (f)  Amount reflects elimination of administrative reimbursements paid by
        the Partnerships to the Purchaser.
 
       (g) Amount  reflects  the elimination  of  the Purchaser's  30%  minority
        interest in the earnings of SJP II.
 
       (h)  Amount reflects the  refinancing of the debt  of the Partnerships at
        8.25% per annum.
 
       (i)  Weighted average number of shares to be issued to each  Partnership,
        assuming a $25.00 share price, is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                  IDS1        IDS2        IDS3
                                                               ----------  ----------  ----------
<S>                                                            <C>         <C>         <C>
Net Asset Value..............................................  $40,066,700 $26,861,846 $39,649,643
Less value of Maximum Tendered Units.........................  (16,705,000) (10,878,000) (16,016,000)
Purchaser's interest in General Partner......................    (530,000)   (338,125)   (431,875)
                                                               ----------  ----------  ----------
Consideration allocable to Unitholders participating in the
Merger.......................................................  $22,831,700 $15,645,721 $23,201,768
                                                                 DIVIDED BY   DIVIDED BY   DIVIDED BY
Assumed share price..........................................  25.00       25.00       25.00
                                                               ----------  ----------  ----------
Weighted average number of shares allocable to Unitholders
participating in the Merger..................................     913,268     625,828     928,070
                                                               ----------  ----------  ----------
                                                               ----------  ----------  ----------
</TABLE>
 
                             Schedule VII - Page 11
<PAGE>
SCHEDULE VIII IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
                                 SCHEDULE VIII
 
                           PARTNERSHIP DISTRIBUTIONS
 
    PARTNERSHIP DISTRIBUTIONS.  The following table sets forth the distributions
paid  per Unit (original purchase price $250  per Unit) in the periods indicated
below:
 
<TABLE>
<CAPTION>
YEAR                                                                               DISTRIBUTION
- ---------------------------------------------------------------------------------  -------------
<S>                                                                                <C>
1990
  Fourth Quarter.................................................................         3.76
1991
  First Quarter..................................................................         3.44
  Second Quarter.................................................................         3.78
  Third Quarter..................................................................         3.78
  Fourth Quarter.................................................................         3.75
1992
  First Quarter..................................................................         3.75
  Second Quarter.................................................................         3.79
  Third Quarter..................................................................         3.87
  Fourth Quarter.................................................................         3.75
1993
  First Quarter..................................................................         3.75
  Second Quarter.................................................................         3.75
  Third Quarter..................................................................         3.75
  Fourth Quarter.................................................................         4.06
1994
  First Quarter..................................................................         4.22
  Second Quarter.................................................................         4.38
  Third Quarter..................................................................         4.53
  Fourth Quarter.................................................................         4.69
1995
  First Quarter..................................................................         4.69
  Second Quarter.................................................................         4.69
  Third Quarter..................................................................         4.69
  Fourth Quarter.................................................................         4.69
1996
  First Quarter..................................................................         4.69
  Second Quarter.................................................................         4.69
</TABLE>
 
                             Schedule VIII - Page 1
<PAGE>
SCHEDULE IX IS HEREBY AMENDED AND RESTATED IN ITS ENTIRETY AS FOLLOWS:
 
                                  SCHEDULE IX
 
                              PROPERTY INFORMATION
 
    The  following table  sets forth certain  information regarding  each of the
Partnership's self storage  centers, including occupancy  at December 31,  1991,
1992, 1993, 1994, 1995 and June 30, 1996
<TABLE>
<CAPTION>
                                                                                                                  OCCUPANCY AT
                                                                                                            ------------------------
                                                                       YEAR      NET RENTABLE                 DEC. 31      DEC. 31
        PROPERTY NAME             PROPERTY LOCATION    OWNED SINCE     BUILT     SQUARE FEET     ACREAGE       1991         1992
- ------------------------------  ---------------------  -----------  -----------  ------------  -----------  -----------  -----------
<S>                             <C>                    <C>          <C>          <C>           <C>          <C>          <C>
Gilbert                         Gilbert, AZ                  1991      1985           66,000          4.0        *            *
Delray Beach                    Delray Beach, FL             1991      1986           77,000          4.5       *            *
Allen Blvd.                     Beaverton, OR                1991    1973/1975        42,000          2.6       *            *
Windcrest                       San Antonio, TX              1991    1975/1993        86,000          6.3       *            *
Dobson Ranch                    Mesa, AZ                     1992      1978           55,000          4.2          N/A       *
Norcross                        Norcross, GA                 1992      1984           62,000          9.3          N/A       *
Stone Mountain                  Stone Mountain, GA           1992      1985           61,000         10.1          N/A       *
Tucker                          Tucker, GA                   1992      1987           60,000          4.6          N/A       *
Forest Park                     Forest Park, GA              1992      1980           65,000          7.9          N/A       *
Rochester                       Utica, MI                    1992      1989           57,000          4.8          N/A       *
Castro Valley                   Castro Valley, CA            1993    1975/1988        69,000          2.8          N/A          N/A
Newark                          Newark, CA                   1993      1991           61,000          3.1          N/A          N/A
San Leandro                     San Leandro, CA              1993      1991           59,000          2.7          N/A          N/A
Tracy                           Tracy, CA                    1993      1986           70,000          3.0          N/A          N/A
Sacramento                      Sacramento, CA               1994      1991           53,000          2.6          N/A          N/A
San Lorenzo                     San Lorenzo, CA              1994      1990           54,000          1.9          N/A          N/A
Castro Valley Business Park     Castro Valley, CA            1994      1989            3,000          0.3          N/A          N/A
                                                                                 ------------       -----
Total                                                                              1,000,000         74.7
 
<CAPTION>
                                  DEC. 31      DEC. 31      DEC. 31      JUNE 30
        PROPERTY NAME              1993         1994         1995         1996
- ------------------------------  -----------  -----------  -----------  -----------
<S>                             <C>          <C>          <C>          <C>
Gilbert                             *            *            *            *
Delray Beach                        *            *            *            *
Allen Blvd.                         *            *            *            *
Windcrest                           *            *            *            *
Dobson Ranch                        *            *            *            *
Norcross                            *            *            *            *
Stone Mountain                      *            *            *            *
Tucker                              *            *            *            *
Forest Park                         *            *            *            *
Rochester                           *            *            *            *
Castro Valley                           96           95           91           94
Newark                              *            *            *            *
San Leandro                         *            *            *            *
Tracy                               *            *            *            *
Sacramento                             N/A       *            *            *
San Lorenzo                            N/A       *            *            *
Castro Valley Business Park            N/A       *            *            *
Total
</TABLE>
 
- ----------------------------------------
 *   These properties are individually less than 10% of historical cost of total
    storage  centers  for  the  Partnership.  The  average  occupancy  of  these
    properties  was 93%,  92%, and  87% at  December 31,  1993, 1994,  and 1995,
    respectively and 89% at June 30, 1996.
 
    The following table presents the  average occupancy per net rentable  square
foot  and  average annual  rental  rate per  net  rentable square  foot  for the
Partnership's properties for the  years ended December 31,  1993, 1994 and  1995
and the six months ended June 30, 1996.
 
<TABLE>
<CAPTION>
                                                                      FOR THE YEAR ENDED DECEMBER 31,       FOR THE SIX
                                                                   -------------------------------------   MONTHS ENDED
                                                                      1993         1994         1995       JUNE 30, 1996
                                                                   -----------  -----------  -----------  ---------------
<S>                                                                <C>          <C>          <C>          <C>
Weighted average occupancy.......................................          90%          92 %         89 %           86   %
Average rental rate per square foot..............................  $     5.79   $     6.72   $     7.45   $       7.87
</TABLE>
 
                              Schedule IX - Page 1
<PAGE>
    A  Letter of Transmittal and any other  required documents should be sent or
delivered by each  Unitholder or  his or  her broker,  dealer, commercial  bank,
trust  company or other  nominee to the  Depositary at one  of its addresses set
forth below.
 
                       The Depositary for this Offer is:
 
                              GEMISYS CORPORATION
 
<TABLE>
<S>                                             <C>
         By Overnight/Hand Delivery:                               By Mail:
            7103 S. Revere Parkway                              P.O. Box 3897
             Englewood, CO 80112                           Englewood, CO 80155-9756
</TABLE>
 
    Any questions  or  requests for  assistance  or additional  copies  of  this
Supplement,  the Offer to Purchase and the Letter of Transmittal may be directed
to the Information Agent at its telephone number and location listed below.  You
may  also  contact your  broker, dealer,  commercial bank  or trust  company for
assistance concerning this Offer.
 
                    The Information Agent for this Offer is:
 
                             D.F. KING & CO., INC.
 
                                77 Water Street
                               New York, NY 10005
                         (212) 269-5550 (Call Collect)
                                       or
                           1-800-207-2872 (Toll Free)

<PAGE>
 [LOGO]
                        1201 Third Avenue, Suite 2200, Seattle, Washington 98101
 
IF YOU HAVE ANY QUESTIONS ABOUT THIS OFFER OR IF YOU NEED HELP IN COMPLETING THE
LETTER  OF TRANSMITTAL, PLEASE CALL THE INFORMATION AGENT, D.F. KING & CO., INC.
AT (800) 207-2872.
 
                                August 26, 1996
 
    Re:  Cash Tender Offer for up to 52,000 Units of
       IDS/Shurgard Income Growth Partners L.P. III
 
Dear Unitholder:
 
    Shurgard Storage Centers,  Inc., a Delaware  corporation (the  "Purchaser"),
has  amended and supplemented its  offer to purchase (the  "Offer") up to 52,000
units of  limited  partnership interest  (the  "Units") in  IDS/Shurgard  Income
Growth  Partners L.P. III, a Washington limited partnership (the "Partnership"),
at a net cash price per Unit of $308 (the "Offer Price"). The Offer is now  made
upon  the terms and subject to the conditions set forth in the Offer to Purchase
dated July 2, 1996,  as amended by the  Purchaser's letter to Unitholders  dated
July  16, 1996 (the  "July 16 Letter")  and the enclosed  Supplement to Offer to
Purchase (the "Supplement"), and in the related Letter of Transmittal.
 
    The Supplement amends and supplements the following sections of the Offer to
Purchase: the cover  page, "Incorporation  of Certain  Documents By  Reference,"
"Cautionary  Statement,"  "Summary," "Special  Considerations,"  "Background and
Purposes of  the Transaction,"  "Fairness of  the Transaction;  Position of  the
General Partner," "Appraisal; Opinions of Financial Advisors," "Market Prices of
Units,"  "Interests  of Certain  Persons," "The  Offer"  -- Section  7 ("Certain
Conditions of the Offer") and --  Section 11 ("Miscellaneous") and Schedules  I,
V,  VI, VII,  VIII and  IX. Except  as set  forth in  the Supplement,  the Offer
continues to be governed by the terms  and conditions set forth in the Offer  to
Purchase,  as  amended by  the  July 16  Letter, and  in  the related  Letter of
Transmittal, and the information contained therein continues to be important  to
each   Unitholder's  decision  with  respect  to  the  Offer.  Accordingly,  the
Supplement should be carefully read in  conjunction with the Offer to  Purchase,
the July 16 Letter and the Letter of Transmittal previously mailed to you.
 
    If  you wish to  sell your Units  and receive a  net cash price  of $308 per
Unit, please complete the Letter of Transmittal and return it to the address set
forth on the back cover of the  Offer to Purchase and the Supplement before  the
expiration date.
 
    PLEASE  NOTE THAT THE EXPIRATION DATE OF THE OFFER HAS BEEN EXTENDED TO 6:00
P.M., NEW YORK CITY TIME, ON MONDAY, SEPTEMBER 9, 1996.
 
    UNITHOLDERS WHO HAVE VALIDLY TENDERED UNITS AND NOT WITHDRAWN THEIR  TENDERS
NEED TAKE NO FURTHER ACTION TO VALIDLY TENDER THOSE UNITS.
 
    We thank you for your prompt attention to this matter.
 
                                          Very truly yours,
 
                                                 [SIGNATURE]
 
                                          Charles K. Barbo
                                          CHAIRMAN AND CHIEF EXECUTIVE OFFICER
                                          SHURGARD STORAGE CENTERS, INC.

<PAGE>

                                                                   PRESS RELEASE

                                     [Letterhead]


CONTACT:
Jennifer Wall                               DeLise Keim
David Frank                                 Harrell Beck
D.F. King & Co., Inc.                       Shurgard Storage Centers, Inc.
212/269-5550                                206/624-8100


FOR IMMEDIATE RELEASE

               SHURGARD EXTENDS OFFERS TO PURCHASE LIMITED PARTNERSHIP
             UNITS IN THREE AFFILIATED SELF STORAGE LIMITED PARTNERSHIPS

     SEATTLE, WASHINGTON, AUGUST 26, 1996...Shurgard Storage Centers,
Inc. ("Shurgard") (NYSE:SHU) announced today that it has extended its offers to
purchase (the "Offers") up to 65,000 limited partnership units in IDS/Shurgard
Income Growth Partners L.P. ("IDS1") for a net cash price of $257 per unit, up
to 49,000 limited partnership units in IDS/Shurgard Income Growth Partners L.P.
II("IDS2") for a net cash price of $222 per unit and up to 52,000 limited
partnership units in IDS/Shurgard Income Growth Partners L.P. III ("IDS3") for a
net cash price of $308 per unit.  The Offers have been extended to provide
unitholders an opportunity to review the Supplements to the Offers to Purchase,
dated August 26, 1996.  The Offers and withdrawal rights now will expire at 6:00
p.m., New York City time, Monday, September 9, 1996, unless extended.

     Shurgard also announced that as of 6:00 p.m., New York City time, August
23, 1996 IDS1 unitholders had validly tendered and not withdrawn approximately
60,206 IDS1 limited partnership units (approximately 41% of the total 
outstanding units).  IDS2 unitholders had validly tendered and not withdrawn
approximately 33,666 IDS2 limited partnership units (approximately 29% of the
total outstanding units) and IDS3 unitholders had validly tendered and not
withdrawn approximately 47,734 IDS3 limited partnership units (approximately 40%
of the total outstanding units).


                                        (MORE)

<PAGE>


Shurgard Storage Centers, Inc.
August 26, 1996
Page 2


     The Offers are being made pursuant to an Acquisition Agreement, dated as of
July 1, 1996, between Shurgard and IDS1, IDS2, and IDS3 (the "Partnerships"). 
The Acquisition Agreement provided that, after completion of the Offers and
subject to the approval of the requisite vote of unitholders of each
Partnership, the Partnerships will be merged with and into Shurgard.  If the
Merger is consummated, unitholders of the Partnerships who participate in the
Merger will receive shares of Shurgard Class A Common Stock in exchange for
their limited partnership units.  The General Partners of each of the
Partnerships have recommended that those unitholders who desire immediate
liquidity tender their units in the Offers and that all other unitholders retain
their units and, instead, participate in the Merger.


                                         ###




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