SHURGARD STORAGE CENTERS INC
424B3, 1996-10-15
LESSORS OF REAL PROPERTY, NEC
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<PAGE>
                     Filed Pursuant to Rule 424(b)(3) Registration No. 333-07937
 
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
                         1201 THIRD AVENUE, SUITE 2200
                           SEATTLE, WASHINGTON 98101
 
                                                                October 11, 1996
 
Dear Limited Partners:
 
    Special  Meetings of limited partners in IDS/Shurgard Income Growth Partners
L.P., IDS/Shurgard  Income  Growth Partners  L.P.  II, and  IDS/Shurgard  Income
Growth  Partners L.P. III, each a  Washington limited partnership (together, the
"Partnerships"), will be held on November  13, 1996, at 10:00 a.m., local  time,
at  1201 Third Avenue, Suite 2200, Seattle, Washington (the "Special Meetings").
You are cordially invited  to attend the Special  Meeting of the Partnership  of
which you are a limited partner.
 
    At each of the Special Meetings, including any adjournments or postponements
thereof,  limited  partners  of the  respective  Partnerships will  be  asked to
consider and vote upon approval of the Acquisition Agreement dated as of July 1,
1996 (the "Acquisition Agreement"),  by and among each  of the Partnerships  and
Shurgard   Storage  Centers,  Inc.,  a  Delaware  corporation  (the  "Company"),
providing for the merger of each of  the Partnerships with and into the  Company
(collectively,  the "Mergers").  Approval of  the Acquisition  Agreement and the
transactions contemplated thereby by limited partners of a Partnership will,  if
applicable,  also  constitute approval  of the  amendments to  the Partnership's
Amended and  Restated Agreement  of Limited  Partnership that  are necessary  to
effect  its  respective  Merger. THE  CLOSING  OF  EACH OF  THE  MERGERS  IS NOT
CONDITIONED UPON THE CLOSING OF ANY OF THE OTHER MERGERS.
 
    The Acquisition Agreement and the transactions contemplated thereby are more
fully  described  in  the  accompanying  Proxy  Statement/Prospectus,  including
discussions  concerning the reasons  for the Mergers and  factors that should be
considered in  connection with  your vote  on the  Merger of  your  Partnership.
Please review this information carefully.
 
    AFTER CAREFUL CONSIDERATION, THE GENERAL PARTNER OF EACH OF THE PARTNERSHIPS
HAS  DETERMINED THAT THE  APPLICABLE MERGER IS  FAIR TO THE  UNITHOLDERS OF THAT
PARTNERSHIP AND RECOMMENDS THAT UNITHOLDERS VOTE FOR APPROVAL OF THE ACQUISITION
AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY.
 
    I hope  that  you will  attend  the  Special Meeting  of  your  Partnership.
However,  whether  or  not  you  plan to  attend  your  Special  Meeting, please
complete, sign and date the  enclosed proxy card and  promptly return it in  the
enclosed  postage prepaid envelope. If you  are present at your Special Meeting,
you may,  if you  wish, withdraw  your proxy  and vote  in person.  If you  have
questions  or need assistance  in completing your proxy,  please call D.F. King,
the Information Agent, at 1-800-207-2872.
 
                                          Very truly yours,
 
                                          [CHARLES K. BARBO SIGNATURE]
 
                                          CHARLES K. BARBO
                                          GENERAL PARTNER OF THE GENERAL PARTNER
                                           OF EACH OF
                                           THE PARTNERSHIPS
<PAGE>
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
                         1201 THIRD AVENUE, SUITE 2200
                           SEATTLE, WASHINGTON 98101
 
                            ------------------------
 
                 NOTICE OF SPECIAL MEETINGS OF LIMITED PARTNERS
                        TO BE HELD ON NOVEMBER 13, 1996
 
                            ------------------------
 
TO THE LIMITED PARTNERS OF IDS/SHURGARD INCOME GROWTH PARTNERS L.P. ("IDS1"),
IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II ("IDS2") AND IDS/SHURGARD INCOME
GROWTH PARTNERS L.P. III ("IDS3"):
 
    NOTICE IS HEREBY  GIVEN THAT  Special Meetings (the  "Special Meetings")  of
limited  partners in  each of  IDS1, IDS2  and IDS3,  each a  Washington limited
partnership (together, the "Partnerships"), will  be held on November 13,  1996,
at  10:00  a.m.,  local  time,  at  1201  Third  Avenue,  Suite  2200,  Seattle,
Washington, to consider and vote upon approval of an Acquisition Agreement dated
as of July  1, 1996  (the "Acquisition  Agreement"), by  and among  each of  the
Partnerships  and Shurgard  Storage Centers,  Inc., a  Delaware corporation (the
"Company"), providing for the merger of  each of the Partnerships with and  into
the  Company  (the "Mergers").  Under the  Acquisition  Agreement, each  unit of
limited partnership interest ("Unit") of  each Partnership that participates  in
the Mergers will be converted into that number of shares of Class A Common Stock
of  the Company,  par value  $.001 per  share (the  "Common Stock"),  derived by
dividing the Net Asset Value (as defined in the Acquisition Agreement) per  Unit
of  the applicable Partnership by the average of the per share closing prices of
the Common  Stock on  the New  York  Stock Exchange  during the  20  consecutive
trading  days ending  on the  fifth trading  day prior  to the  date the General
Partner of the  Partnership actually  calls for  the vote  of the  Partnership's
Unitholders to approve the applicable Merger (the "Share Price"). Depending upon
each  Partnership's Share Price, (i)  each IDS1 Unit will  be converted into the
right to receive between 9.26 and 11.55  shares of Common Stock, (ii) each  IDS2
Unit will be converted into the right to receive between 8.00 and 9.98 shares of
Common  Stock  and (iii)  each IDS3  Unit will  be converted  into the  right to
receive between  11.10  and 13.84  shares  of Common  Stock.  See  "Summary--The
Mergers--The Mergers" in the accompanying Proxy Statement/Prospectus for a chart
indicating  the number of shares  of Common Stock to  be received in the Mergers
for each  Unit held  based upon  various Common  Stock prices.  For  information
regarding  the actual  number of shares  of Common  Stock to be  received in the
Mergers,  please  call  1-800-955-2235  ext.  4.  Approval  of  the  Acquisition
Agreement  and the  transactions contemplated thereby  by limited  partners of a
Partnership will, if applicable, also constitute approval of those amendments to
the  Partnership's  Amended  and  Restated  Agreement  of  Limited   Partnership
necessary to effect its respective Merger. THE CLOSING OF EACH OF THE MERGERS IS
NOT CONDITIONED ON THE CLOSING OF ANY OF THE OTHER MERGERS.
 
    UNITHOLDERS SHOULD CAREFULLY REVIEW THE ACCOMPANYING PROXY
STATEMENT/PROSPECTUS,  WHICH MORE FULLY  DESCRIBES THE TERMS  OF THE MERGERS AND
RELATED TRANSACTIONS. THE FULL TEXT OF THE ACQUISITION AGREEMENT IS ATTACHED  AS
APPENDIX A TO THE PROXY STATEMENT/PROSPECTUS.
 
    Limited    partners   as   of   the   date   of   the   accompanying   Proxy
Statement/Prospectus are entitled to notice of the Special Meetings. If Units of
a  Partnership  are  transferred  after  the  date  of  the  accompanying  Proxy
Statement/Prospectus but prior to the date of that Partnership's Special Meeting
or  any  adjournment  or  postponement  thereof,  and  the  new  holders  of the
transferred  Units  are  admitted  as  substituted  limited  partners  of   that
Partnership,   this   Notice  of   Special   Meeting,  the   accompanying  Proxy
Statement/Prospectus and related  information will  be sent  to the  substituted
limited  partners along  with notice of  their substitution  and admission. This
substitution and admission will terminate
<PAGE>
the right of the prior limited partners  to vote on approval of the  Acquisition
Agreement  and the  transactions contemplated thereby,  and any votes  as to the
transferred Units must be made by the substituted limited partners.
 
    A limited partner will be entitled to dissenters' rights in connection  with
the Mergers if the limited partner properly exercises those rights under Section
25.10.900  et seq. of  the Washington Uniform Limited  Partnership Act. The full
text  of   this   Section   is   attached   as   Appendix   E   to   the   Proxy
Statement/Prospectus.
 
    Whether  or not  you plan to  attend your Special  Meeting, please complete,
sign and date the  enclosed proxy card  and return it  promptly in the  enclosed
postage  prepaid envelope. Your prompt  cooperation will be greatly appreciated.
You may, if you wish,  revoke your proxy by  attending your Special Meeting  and
voting  in person or by sending Gemisys  Corporation a duly executed later dated
proxy or written notice of revocation. Any subsequent proxy or written notice of
revocation should be mailed to Gemisys Corporation at P.O. Box 3897,  Englewood,
Colorado 80155-9756, faxed to Gemisys Corporation at 1-800-387-7361 at least one
business  day prior to the date on which the General Partner of your Partnership
actually calls for the  vote of your Partnership's  Unitholders to approve  your
Partnership's  Merger or hand delivered to Gemisys Corporation at 7103 S. Revere
Parkway, Englewood,  Colorado 80112.  However,  in order  for faxed  proxies  or
revocations  to be effective,  Unitholders must also mail  the original proxy or
revocation to Gemisys Corporation for receipt  no later than five business  days
after  the date the General  Partner of your Partnership  actually calls for the
Merger vote.
 
                                          Very truly yours,
 
                                          [CHARLES K. BARBO SIGNATURE]
 
                                          CHARLES K. BARBO
                                          GENERAL PARTNER OF THE GENERAL PARTNER
                                           OF EACH OF
                                           THE PARTNERSHIPS
 
October 11, 1996
<PAGE>
                         SHURGARD STORAGE CENTERS, INC.
                           PROXY STATEMENT/PROSPECTUS
                FOR THE SPECIAL MEETINGS OF LIMITED PARTNERS OF
                   IDS/SHURGARD INCOME GROWTH PARTNERS L.P.,
                IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II AND
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
                        TO BE HELD ON NOVEMBER 13, 1996
 
    This  Proxy Statement/Prospectus is  being furnished to  holders of units of
limited partnership  interest  ("IDS1  Units")  in  IDS/Shurgard  Income  Growth
Partners  L.P. ("IDS1"), holders of units of limited partnership interest ("IDS2
Units") in IDS/Shurgard Income Growth Partners  L.P. II ("IDS2") and holders  of
units  of limited partnership interest ("IDS3 Units," and together with the IDS1
Units and IDS2 Units, the "Units")  in IDS/Shurgard Income Growth Partners  L.P.
III  ("IDS3"), each  a Washington  limited partnership,  in connection  with the
solicitation of proxies to  be used at  the special meetings  of holders of  the
Units  (the "IDS1  Special Meeting,"  "IDS2 Special  Meeting" and  "IDS3 Special
Meeting," respectively, and collectively, the "Special Meetings") to be held  on
November  13, 1996, at 10:00 a.m., local time, at 1201 Third Avenue, Suite 2200,
Seattle, Washington. The holders  of IDS1 Units, IDS2  Units and IDS3 Units  are
referred   to  as   the  "IDS1   Unitholders,"  "IDS2   Unitholders"  and  "IDS3
Unitholders," respectively, and collectively,  as the "Unitholders." IDS1,  IDS2
and  IDS3 are  referred to  collectively as the  "Partnerships." At  each of the
Special Meetings,  Unitholders of  each of  the Partnerships  will be  asked  to
consider  and vote upon approval of an Acquisition Agreement dated as of July 1,
1996 (the "Acquisition Agreement") by and among Shurgard Storage Centers,  Inc.,
a  Delaware  corporation  (the  "Company"  or  "SSCI"),  and  the  Partnerships,
providing for the merger of each of  the Partnerships with and into the  Company
(the   "IDS1  Merger,"  "IDS2  Merger"  and  "IDS3  Merger,"  respectively,  and
collectively, the "Mergers").
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 23 FOR CERTAIN FACTORS WHICH SHOULD  BE
CONSIDERED IN EVALUATING THE MATTERS DESCRIBED HEREIN, INCLUDING AMONG OTHERS:
 
    - The  Company, the General  Partners and their  affiliates have significant
      conflicts of interest in connection with the Mergers, and no  unaffiliated
      representatives  were appointed to  negotiate the terms  of the Mergers on
      behalf of  any of  the  Partnerships. These  conflicts of  interest  arise
      because,  among  other  factors, certain  representatives  of  the General
      Partners are also officers of the Company.
 
    - As a result  of the Mergers,  the nature of  each Unitholder's  investment
      will  change from an interest in a specified portfolio of properties for a
      finite period to an investment in an ongoing fully-integrated real  estate
      company, which has a portfolio of properties that may be changed from time
      to  time and which  does not plan  to liquidate its  assets within a fixed
      period of time.
 
    - The Mergers will be taxable events resulting in the recognition of gain or
      loss to taxable Unitholders, and no special cash distribution will be made
      to Unitholders for the payment of any tax.
 
    - The Mergers  may affect  the  level or  growth  of distributions  made  to
      Unitholders   who  become  stockholders,  with  the  potential  that  some
      Unitholders may receive smaller distributions or distributions may grow at
      a slower rate than if the  Mergers were not consummated and they  remained
      Unitholders.
 
    - The  properties of the  Partnerships may appreciate in  value and might be
      able to  be liquidated  at a  later date  for a  price which  would  yield
      Unitholders more consideration than they would receive in the Mergers.
 
    - The   Company  could  become  more  highly   leveraged  than  any  of  the
      Partnerships, resulting in an increase in debt service and an increase  in
      the risk of default on its obligations.
                                                        (CONTINUED ON NEXT PAGE)
                            ------------------------
 
THE  SECURITIES ISSUABLE  PURSUANT TO  THIS PROXY  STATEMENT/PROSPECTUS HAVE NOT
BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY
   STATE  SECURITIES  COMMISSION,  NOR  HAS  THE  SECURITIES  AND  EXCHANGE
     COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  PASSED  UPON THE
       ACCURACY OR ADEQUACY OF THIS PROXY STATEMENT/PROSPECTUS. ANY
                REPRESENTATION  TO  THE  CONTRARY  IS  A  CRIMINAL
                                    OFFENSE.
                            ------------------------
 
        The date of this Proxy Statement/Prospectus is October 11, 1996
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    -The  consideration to  be received by  Unitholders is  based in substantial
     part on third  party appraisals of  the market value  of the  Partnerships'
     properties  as of December 31, 1995. These appraisals are opinions of value
     as of the date specified, do not reflect any changes in value that may have
     occurred after that date,  are subject to certain  assumptions and may  not
     represent  the  true worth  or realizable  value of  the properties  of the
     Partnerships.
 
    -Certain valuations  of the  Partnerships performed  by Alex.  Brown &  Sons
     Incorporated,  the financial advisor to a special committee of the Board of
     Directors of the  Company ("Alex.  Brown"), were above,  while others  were
     below, the aggregate consideration to be issued per Unit in the Mergers.
 
    -There  can be no assurance  that the Company will  continue to qualify as a
     real estate  investment trust  ("REIT"). If  the Company  were to  fail  to
     qualify as a REIT, its distributed income would be subject to two levels of
     taxation  and would reduce the amount of cash available for distribution to
     stockholders.
 
    -If the  average  price of  the  Common Stock  (as  defined below)  for  the
     designated period used to determine the Share Price is less than $22.25 per
     share  or  if  the  market  price  of  the  Common  Stock  decreases  after
     determination of the number of Shares  (as defined herein) to be issued  in
     the  Mergers and prior to  the issuance of the  Shares, the market value of
     the Shares received by Unitholders in the Mergers may be less than the  Net
     Asset Values (as defined herein) of the Partnerships.
 
    -The market price of the Common Stock may decrease following issuance of the
     Shares.
 
    -A  Unitholder  will  be  entitled to  dissenters'  rights  of  appraisal in
     connection with  a  Merger  only  if  the  Unitholder  satisfies  specified
     procedures.
 
    The  Acquisition Agreement provides  that upon consummation  of the Mergers,
each of the IDS1 Units, IDS2 Units and IDS3 Units (other than Units held by  the
Company,  which will be  cancelled, and Units,  if any, held  by Unitholders who
perfect dissenters' rights)  will be converted  into the right  to receive  that
number  of shares  of Class A  Common Stock, par  value $.001 per  share, of the
Company (the "Common Stock") derived by dividing the respective Net Asset  Value
per  Unit by the respective Share Price. Depending upon each Partnership's Share
Price (which is the average of the per share closing prices of the Common  Stock
on  the New York Stock Exchange during the 20 consecutive trading days ending on
the fifth trading day prior to the  date the General Partner of the  Partnership
actually  calls for  the vote  of the  Partnership's Unitholders  to approve the
applicable Merger),  (i) each  IDS1 unit  will be  converted into  the right  to
receive  between 9.26 and 11.55 shares of Common Stock, (ii) each IDS2 unit will
be converted into the right  to receive between 8.00  and 9.98 shares of  Common
Stock  and (iii)  each IDS3  unit will  be converted  into the  right to receive
between 11.10 and  13.84 shares of  Common Stock. The  Company may also  provide
additional   cash  consideration  in  certain  circumstances.  For  purposes  of
computing the number of shares of Common  Stock to be issued to Unitholders,  if
the  average price of  the Common Stock is  greater than $27.75  then it will be
deemed to be $27.75, and if the average  price of the Common Stock is less  than
$22.25 then it will be deemed to be $22.25. The total number of shares of Common
Stock  to be issued in connection with the Mergers will be between approximately
2,349,200 and approximately 2,929,800, depending upon the Share Price. See  "The
Summary  -- The  Mergers -- The  Mergers" for  a chart indicating  the number of
shares of Common Stock to  be received in the Mergers  for each Unit held  based
upon various Common Stock prices. For information regarding the actual number of
shares of Common Stock to be received in the Mergers, please call 1-800-955-2235
ext.  4.  Approval of  the Acquisition  Agreement by  IDS2 Unitholders  and IDS3
Unitholders will also constitute approval of those amendments to the  applicable
Partnership's  Amended  and  Restated  Agreement  of  Limited  Partnership  (the
"Partnership Agreement") necessary to  effect the applicable  Merger. A copy  of
the   Acquisition  Agreement   is  attached   as  Appendix   A  to   this  Proxy
Statement/Prospectus. The closing of each of the Mergers is not conditioned upon
the closing of any of the other Mergers.
 
    Based on the  assumptions stated in  "Estimated Taxable Gain  or Loss,"  the
applicable  General Partner  estimates that  Unitholders will  realize a taxable
gain of approximately $43 per IDS1 Unit, $2 per IDS2 Unit and $72 per IDS3 Unit,
respectively. The actual amount  of gain or loss  recognized by each  Unitholder
depends upon a variety of factors.
 
    THE  GENERAL PARTNER OF EACH PARTNERSHIP, WHICH HAS SIGNIFICANT CONFLICTS OF
INTEREST IN CONNECTION WITH  THE MERGERS, RECOMMENDS  THAT UNITHOLDERS VOTE  FOR
APPROVAL OF THE ACQUISITION AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY,
INCLUDING THE MERGERS.
 
    The Common Stock is traded on the New York Stock Exchange (the "NYSE") under
the  symbol "SHU." On October 9, 1996, the  closing price of the Common Stock on
the NYSE was $25.50. There is no established trading market for the Units.
 
    This Proxy Statement/Prospectus is  first being mailed  on or about  October
15,  1996 to Unitholders of record at the  close of business on the date of this
Proxy Statement/Prospectus.
 
                                       ii
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
AVAILABLE INFORMATION......................................................................................         ix
 
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE............................................................         ix
 
SUMMARY....................................................................................................          1
  The Company..............................................................................................          1
  The Partnerships.........................................................................................          1
    IDS1...................................................................................................          1
    IDS2...................................................................................................          1
    IDS3...................................................................................................          2
  Risk Factors.............................................................................................          2
    Risks Relating to the Mergers..........................................................................          2
    General Real Estate Investment Risks...................................................................          3
    Risks Relating to Qualification and Operation as a REIT................................................          4
    Other General Risks....................................................................................          4
  The Special Meetings.....................................................................................          4
  The Mergers..............................................................................................          5
    Background.............................................................................................          5
    The Mergers............................................................................................          6
  General Partners' Reasons for Recommending the Mergers...................................................          8
  IPSC Consent.............................................................................................          8
  Expected Benefits from the Mergers.......................................................................          8
  Alternatives to the Mergers..............................................................................          8
    Liquidation............................................................................................          8
    Continuation of Partnerships...........................................................................          9
    Support of Secondary Market............................................................................          9
    Reorganizations of Partnerships as Separate REITs......................................................          9
  Comparison of Merger Consideration to Alternatives.......................................................          9
  Fairness of the Mergers..................................................................................         11
  Third Party Opinions.....................................................................................         12
    The Appraisals.........................................................................................         12
    Stanger Fairness Opinion...............................................................................         12
  Comparison of the Partnerships and the Company...........................................................         12
    Form of Organization...................................................................................         12
    Length of Investment...................................................................................         12
    Nature of Investment...................................................................................         13
    Properties and Diversification.........................................................................         13
    Permitted Investments..................................................................................         13
    Additional Equity......................................................................................         13
    Borrowing Policies.....................................................................................         13
    Restrictions on Related Party Transactions.............................................................         13
    Compensation, Fees and Distributions...................................................................         14
    Management Control and Responsibilities................................................................         14
    Management Liability and Indemnification...............................................................         14
    Voting Rights..........................................................................................         14
    Liquidity..............................................................................................         14
    Taxation of Taxable Investors..........................................................................         14
    Taxation of Tax-Exempt Investors.......................................................................         14
  Conflicts of Interest....................................................................................         14
  Amendments to Partnership Agreements.....................................................................         15
  Dissenters' Rights of Unitholders........................................................................         15
</TABLE>
 
                                      iii
<PAGE>
<TABLE>
<S>                                                                                                          <C>
  Material Federal Income Tax Considerations...............................................................         15
  Accounting Treatment.....................................................................................         16
  Ownership Structure of the Partnerships..................................................................         16
 
SELECTED FINANCIAL INFORMATION OF THE COMPANY..............................................................         18
 
SUMMARY PRO FORMA CONSOLIDATED FINANCIAL DATA..............................................................         20
 
COMPARATIVE PER SHARE DATA.................................................................................         21
 
DISTRIBUTIONS AND MARKET PRICES OF COMMON STOCK............................................................         22
 
RISK FACTORS...............................................................................................         23
  Risks Relating to the Mergers............................................................................         23
    Conflicts of Interest..................................................................................         23
    Lack of Independent Representation.....................................................................         23
    Change in Nature of Investment.........................................................................         23
    Mergers as Taxable Events; No Special Cash Distribution for the Payment of Any Tax.....................         23
    Mergers as Taxable Events for Non-Tax-Exempt Unitholders...............................................         24
    Consequences of Mergers to Tax-Exempt Unitholders......................................................         24
    Changes in Tax Characterization of Distributions.......................................................         24
    Potential Differences Between Merger Consideration and Realizable Value................................         24
    Uncertainty Regarding Market Price of Common Stock.....................................................         24
    Potential Change in Growth and Level of Distributions..................................................         25
    Consideration Different than Alex. Brown Valuations....................................................         25
    Elimination of Priority Returns to Unitholders.........................................................         25
    Potential Loss of Future Appreciation..................................................................         25
    Risk of Substantial Indebtedness.......................................................................         25
    Loss of Relative Voting Power..........................................................................         25
    Availability of Dissenters' Rights.....................................................................         25
  General Real Estate Investment Risks.....................................................................         26
    General Risks Relating to Real Estate Ownership and Operation of Self Storage Centers..................         26
    Risks of Real Estate Development.......................................................................         26
    Investments in Other Commercial Real Estate............................................................         26
    Indirect Investments...................................................................................         26
    Limited Asset Diversification..........................................................................         27
    Competition............................................................................................         27
    Limited Potential for Occupancy Gains..................................................................         27
    Possible Liability Relating to Environmental Matters...................................................         27
    Cost of Compliance with Americans With Disabilities Act and Fire and Safety Regulations................         28
    Property Taxes.........................................................................................         28
  Risks Relating to Qualification and Operation as a REIT..................................................         28
    Failure to Remain Qualified as a REIT..................................................................         28
    Effect of Distribution Requirements....................................................................         29
    Changes in Tax Laws Which Could Affect REITs...........................................................         29
  Other General Risks......................................................................................         29
    Risks Associated with Management of Properties.........................................................         29
    Effect of Market Interest Rates on Price of Common Stock...............................................         29
 
THE SPECIAL MEETINGS.......................................................................................         30
  General..................................................................................................         30
  The IDS1 Special Meeting.................................................................................         30
  The IDS2 Special Meeting.................................................................................         31
  The IDS3 Special Meeting.................................................................................         32
</TABLE>
 
                                       iv
<PAGE>
<TABLE>
<S>                                                                                                          <C>
  Solicitation of Proxies by Soliciting Agent..............................................................         34
  Information and Tabulation...............................................................................         34
 
BACKGROUND AND REASONS FOR THE MERGERS.....................................................................         35
  Background...............................................................................................         35
  Purposes and Structure of the Offers and the Mergers.....................................................         40
  General Partners' Recommendations and Reasons............................................................         41
  Expected Benefits From the Mergers.......................................................................         42
    Asset Diversification..................................................................................         42
    Liquidity..............................................................................................         42
    Retirement Plan and IRA Valuations.....................................................................         42
    Simplified Tax Administration..........................................................................         42
    Reduced State Income Tax Reporting.....................................................................         42
  Alternatives to the Mergers..............................................................................         42
    Liquidation............................................................................................         42
    Continuation of the Partnerships.......................................................................         44
    Support of Secondary Market............................................................................         44
    Reorganizations of Partnerships as Separate REITs......................................................         44
 
FAIRNESS OF THE MERGERS....................................................................................         45
  Conclusions of the General Partners......................................................................         45
  Determination of Merger Consideration....................................................................         45
  Fairness of the Mergers to the Unitholders...............................................................         46
    Real Estate Portfolio Appraisals.......................................................................         46
    Stanger Fairness Opinion...............................................................................         46
    Comparison of Certain Benefits and Detriments of Alternatives to the Mergers...........................         46
    Distributions in Accordance With Original Investor Understandings......................................         47
    Fairness in View of Conflicts of Interest..............................................................         47
    Fairness in View of PS Agreement.......................................................................         47
    Allocation of Merger Expenses..........................................................................         47
    Impact of Merger on Partnership Distributions..........................................................         47
    Washington Statutory Dissenters' Rights................................................................         48
  Comparison of Merger Consideration to Alternatives.......................................................         48
    General................................................................................................         48
    Going Concern Values...................................................................................         49
    Liquidation Values.....................................................................................         51
  Distribution Comparison..................................................................................         52
  Conclusions of the Special Committee.....................................................................         53
    Recommendation of the General Partners.................................................................         53
    Consent of IPSC........................................................................................         53
    Appraisals.............................................................................................         53
    Fairness Opinion.......................................................................................         53
 
THE ACQUISITION AGREEMENT..................................................................................         53
  The Mergers..............................................................................................         53
  Representation and Warranties............................................................................         54
  Conduct of Business Pending the Effective Time...........................................................         54
  IPSC Consent.............................................................................................         55
  Standstill Agreement.....................................................................................         55
  No Solicitation of Transactions..........................................................................         55
  Indemnification..........................................................................................         55
</TABLE>
 
                                       v
<PAGE>
<TABLE>
<S>                                                                                                          <C>
  Conditions Precedent to the Mergers......................................................................         55
    Conditions to Each Party's Obligations.................................................................         55
    Conditions to the Obligations of the Company...........................................................         56
    Conditions to the Obligations of the Partnerships......................................................         56
  Termination..............................................................................................         56
  Fees and Expenses........................................................................................         57
  Effect of Termination....................................................................................         58
  Amendment................................................................................................         58
  Dissenters' Rights.......................................................................................         58
  Amendments to the Partnership Agreements.................................................................         59
  General Partner Undertaking..............................................................................         59
 
SOURCE AND AMOUNT OF FUNDS.................................................................................         59
 
APPRAISALS AND OPINIONS OF FINANCIAL ADVISORS..............................................................         60
  Portfolio Appraisals of the Partnerships' Properties.....................................................         60
    Experience of Stanger..................................................................................         60
    Summary of Methodology.................................................................................         60
    Income Approach........................................................................................         61
    Sales Comparison Approach..............................................................................         62
    Conclusions as to Value................................................................................         63
    Assumptions, Limitations and Qualifications of Portfolio Appraisals....................................         63
    Compensation and Material Relationships................................................................         63
  Opinion of the Partnerships' Financial Advisor...........................................................         63
    Summary of Materials Considered........................................................................         64
    Summary of Analysis....................................................................................         64
    Appraisals.............................................................................................         64
    Review of Liquidation Analysis.........................................................................         64
    Review of Going Concern Analysis.......................................................................         65
    Review of Tender Offer and Secondary Market Prices.....................................................         65
    Conclusions............................................................................................         66
    Assumptions............................................................................................         66
    Limitations and Qualifications of Fairness Opinion.....................................................         66
    Compensation and Material Relationships................................................................         67
  Opinion of the Company's Financial Advisor...............................................................         67
    Historical Financial Position..........................................................................         68
    Historical Stock Price Performance.....................................................................         68
    Analysis of Certain Other Publicly Traded Companies....................................................         68
    Analysis of Selected Real Estate Acquisitions..........................................................         69
    Discounted Cash Flow Analysis..........................................................................         69
    Pro Forma Combined Earnings Analysis...................................................................         70
    Real Estate Market and Economic Factors................................................................         70
    Analysis of Offers Absent Consummation of Merger.......................................................         70
 
PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS................................................................         72
 
COMPARISONS OF PARTNERSHIPS AND COMPANY....................................................................         78
 
CONFLICTS OF INTEREST......................................................................................         92
  Common Composition of General Partners...................................................................         92
  Overlaps Between Affiliates of the General Partners and Directors and Officers of the Company............         92
  Company Ownership of Units...............................................................................         92
  General Partner's Interest...............................................................................         92
  Management Agreements....................................................................................         93
</TABLE>
 
                                       vi
<PAGE>
<TABLE>
<S>                                                                                                          <C>
  Ownership of Company Common Stock by Affiliates of the General Partners..................................         94
  Contingent Shares Agreement..............................................................................         94
  Comparison of Pre- and Post-Merger Compensation and Distributions to General Partners and Affiliates.....         94
    Pre-Merger Compensation and Distributions..............................................................         94
    Post-Merger Compensation and Dividends.................................................................         95
  Absence of Independent Soliciting Agent; Indemnification.................................................         96
 
FIDUCIARY RESPONSIBILITY...................................................................................         96
  Directors and Officers of the Company....................................................................         96
  General Partners of the Partnerships.....................................................................         97
 
BUSINESS AND PROPERTIES OF THE PARTNERSHIPS................................................................         98
  General..................................................................................................         98
  Employees and Property Management........................................................................         99
  Litigation...............................................................................................         99
  IDS1.....................................................................................................        100
    Property Information...................................................................................        100
    Selected Financial Information.........................................................................        101
    Management's Discussion and Analysis of Financial Condition and Results of Operations..................        102
      Results of Operations - Six Months Ended June 30, 1996 and 1995......................................        102
      Results of Operations - Years Ended December 31, 1995, 1994 and 1993.................................        102
      Liquidity and Capital Resources - Six Months Ended June 30, 1996 and 1995............................        103
      Liquidity and Capital Resources - Years Ended December 31, 1995, 1994 and 1993.......................        103
  IDS2.....................................................................................................        104
    Property Information...................................................................................        104
    Selected Financial Information.........................................................................        105
    Management's Discussion and Analysis of Financial Condition and Results of Operations..................        106
      Results of Operations - Six Months Ended June 30, 1996 and 1995......................................        106
      Results of Operations - Years Ended December 31, 1995, 1994 and 1993.................................        106
      Liquidity and Capital Resources - Six Months Ended June 30, 1996 and 1995............................        107
      Liquidity and Capital Resources - Years Ended December 31, 1995, 1994 and 1993.......................        107
  IDS3.....................................................................................................        109
    Property Information...................................................................................        109
    Selected Financial Information.........................................................................        110
    Management's Discussion and Analysis of Financial Condition and Results of Operations..................        111
      Results of Operations - Six Months Ended June 30, 1996 and 1995......................................        111
      Results of Operations - Years Ended December 31, 1995, 1994 and 1993.................................        111
      Liquidity and Capital Resources - Six Months Ended June 30, 1996 and 1995............................        112
      Liquidity and Capital Resources - Years Ended December 31, 1995, 1994 and 1993.......................        113
  Beneficial Ownership.....................................................................................        114
 
DISTRIBUTIONS AND MARKET PRICES OF UNITS...................................................................        115
  Partnership Distributions................................................................................        115
  Market Prices of Units...................................................................................        115
    Volume of Sales........................................................................................        115
    Secondary Market Information...........................................................................        116
 
BUSINESS AND PROPERTIES OF THE COMPANY.....................................................................        120
  History of the Company...................................................................................        120
  The Properties...........................................................................................        120
</TABLE>
 
                                      vii
<PAGE>
<TABLE>
<S>                                                                                                          <C>
DESCRIPTION OF CAPITAL STOCK...............................................................................        126
  Common Stock and Class B Common Stock....................................................................        126
    Terms..................................................................................................        126
    Restrictions on Ownership..............................................................................        126
    Transfer Agent.........................................................................................        126
    Stockholder Rights Plan................................................................................        126
  Preferred Stock..........................................................................................        129
  Restrictions On Transfers Of Capital Stock; Excess Stock.................................................        129
 
DISSENTERS' RIGHTS OF UNITHOLDERS..........................................................................        131
 
ESTIMATED TAXABLE GAIN OR LOSS.............................................................................        132
 
MATERIAL FEDERAL INCOME TAX CONSIDERATIONS.................................................................        133
  General..................................................................................................        133
  Opinion of Counsel.......................................................................................        133
  Tax Consequences of the Mergers..........................................................................        134
    Tax Consequences of Acquisition........................................................................        134
    Allocation of Gain or Loss Among Participating Unitholders.............................................        135
    Characterization of Gain or Loss.......................................................................        135
    Mergers of the Partnerships............................................................................        136
    Distribution of Shares.................................................................................        136
    Tax Consequences to Dissenting Unitholders.............................................................        136
    Consequences to Tax-Exempt Unitholders.................................................................        137
    Tax Consequences to the Company........................................................................        137
  Taxation of the Company as a REIT........................................................................        137
    General................................................................................................        137
    Requirements for Qualification.........................................................................        138
    Income Tests...........................................................................................        139
    Asset Tests............................................................................................        140
    Annual Distribution Requirements.......................................................................        141
    Failure to Qualify.....................................................................................        141
    Taxation of Taxable Stockholders.......................................................................        141
    Taxation of Tax-Exempt Stockholders....................................................................        142
    Taxation of Foreign Stockholders.......................................................................        143
    Backup Withholding.....................................................................................        144
    State and Local Taxes and Withholding..................................................................        144
 
LEGAL MATTERS..............................................................................................        144
 
EXPERTS....................................................................................................        144
 
GLOSSARY OF TERMS..........................................................................................        145
 
INDEX TO FINANCIAL STATEMENTS..............................................................................        F-1
 
APPENDIX A -- Acquisition Agreement........................................................................        A-1
 
APPENDIX B -- Summary Portfolio Appraisal Report of Robert A. Stanger & Co., Inc. .........................        B-1
 
APPENDIX C -- Fairness Opinion of Robert A. Stanger & Co., Inc. ...........................................        C-1
 
APPENDIX D -- Fairness Opinion of Alex. Brown & Sons Incorporated .........................................        D-1
 
APPENDIX E -- Dissenters' Rights -- Section 25.10.900 et seq. of the Washington Uniform Limited Partnership
 Act.......................................................................................................        E-1
</TABLE>
 
                                      viii
<PAGE>
                             AVAILABLE INFORMATION
 
    The  Company  has filed  with the  Securities  and Exchange  Commission (the
"Commission")  a  Registration   Statement  on  Form   S-4  (the   "Registration
Statement") under the Securities Act of 1933, as amended (the "Securities Act"),
with respect to the shares of Common Stock to be issued upon consummation of the
Mergers.  This  Proxy  Statement/Prospectus,  which constitutes  a  part  of the
Registration Statement, does not  contain all the information  set forth in  the
Registration Statement and exhibits to the Registration Statement. Copies of the
Registration  Statement  and the  exhibits are  on  file at  the offices  of the
Commission and  may be  obtained, upon  payment of  the fees  prescribed by  the
Commission,  or may be examined without charge at the offices of the Commission.
All summaries of  agreements contained  in this  Proxy Statement/Prospectus  are
subject in all respects to the full text of such documents. Reference is made to
the  copies of  certain of  those documents  filed with  the Commission  for the
complete statement of their provisions.
 
    The Company  and each  of  the Partnerships  are  subject to  the  reporting
requirements  of the Securities Exchange Act  of 1934, as amended (the "Exchange
Act"), and, in accordance therewith, file reports and other information with the
Commission. Such reports  and other  information filed  by the  Company and  the
Partnerships  can be copied at the public reference facilities maintained by the
Commission at  450 Fifth  Street,  N.W., Washington,  D.C. 20549,  the  regional
offices  of the Commission  at 7 World  Trade Center, 13th  Floor, New York, New
York 10048, and Citicorp Center, Suite  1400, 500 West Madison Street,  Chicago,
Illinois 60661. Copies of such material can be obtained at prescribed rates from
the Public Reference Section of the Commission at its office in Washington, D.C.
Such  information for the  Company can also  be inspected at  the offices of the
NYSE, 20 Broad Street, New York, New York 10005.
 
    All  information   concerning   the   Company  contained   in   this   Proxy
Statement/Prospectus  has  been furnished  by  the Company  and  all information
concerning the Partnerships or the General Partners of the Partnerships has been
furnished by the applicable Partnership or General Partner. Neither the delivery
of this Proxy Statement/Prospectus nor any distribution of securities  hereunder
shall  under any circumstances be deemed to  imply that there has been no change
in the assets, properties or affairs of  the Company or any of the  Partnerships
since  the date hereof or that the information set forth herein is correct as of
any time subsequent to the date hereof.
 
    No  person  is  authorized   to  give  any  information   or  to  make   any
representations  other than those  contained herein and, if  given or made, such
information must not be relied upon as having been authorized by the Company  or
the  Partnerships. This Proxy Statement/Prospectus  does not constitute an offer
to sell any  securities other than  the securities  to which it  relates, or  an
offer  to sell or  a solicitation of  an offer to  buy any of  the securities to
which  this  Proxy  Statement/Prospectus  relates   to  or  by  anyone  in   any
jurisdiction  in which the offer  or solicitation is not  authorized or in which
the person making the offer or solicitation is not qualified to do so or to  any
person to whom it is unlawful to make the offer or solicitation.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The  following documents filed with the  Commission by the Company (File No.
0-23466) are incorporated by reference in this Proxy Statement/Prospectus:
 
        (i) the Company's Quarterly Reports on Form 10-Q for the quarters  ended
    June 30, 1996 and March 31, 1996;
 
        (ii)  the  Company's  Proxy Statement  for  its 1996  Annual  Meeting of
    Stockholders;
 
       (iii) the  Company's  Annual Report  on  Form  10-K for  the  year  ended
    December  31, 1995, as amended by the Company's Form 10-K/A filed on October
    9, 1996;
 
       (iv)  the  description  of  Common  Stock  contained  in  the   Company's
    Registration Statement on Form 8-A, as amended, dated April 19, 1995; and
 
                                       ix
<PAGE>
        (v)  the description of the Preferred Share Purchase Rights contained in
    the Company's Registration Statement  on Form 8-A,  as amended, dated  April
    19, 1995.
 
    All  documents filed by the Company pursuant  to Section 13(a), 13(c), 14 or
15(d)  of   the  Exchange   Act   subsequent  to   the   date  of   this   Proxy
Statement/Prospectus  and prior  to the  date of  the Special  Meetings shall be
deemed to  be incorporated  by reference  herein from  the date  of filing  such
documents.  Any  statement contained  herein or  in  a document  incorporated or
deemed to be incorporated by reference herein shall be deemed to be modified  or
superseded  for purposes of this Proxy Statement/Prospectus to the extent that a
statement contained herein or in any  subsequently filed document which also  is
or  is deemed to be incorporated by reference herein modifies or supersedes that
statement. Any statement so modified or  superseded shall not be deemed,  except
as   so  modified   or  superseded,   to  constitute   a  part   of  this  Proxy
Statement/Prospectus.
 
    THIS PROXY STATEMENT/PROSPECTUS  INCORPORATES DOCUMENTS  BY REFERENCE  WHICH
ARE  NOT PRESENTED HEREIN OR DELIVERED  HEREWITH. COPIES OF THESE DOCUMENTS (NOT
INCLUDING EXHIBITS  TO  THE  DOCUMENTS, UNLESS  THE  EXHIBITS  ARE  SPECIFICALLY
INCORPORATED    BY   REFERENCE   INTO   THE    INFORMATION   THAT   THIS   PROXY
STATEMENT/PROSPECTUS INCORPORATES)  WILL  BE  PROVIDED WITHOUT  CHARGE  TO  EACH
PERSON,  INCLUDING ANY BENEFICIAL OWNER, TO WHOM THIS PROXY STATEMENT/PROSPECTUS
IS DELIVERED,  UPON WRITTEN  OR ORAL  REQUEST. REQUESTS  SHOULD BE  DIRECTED  TO
SHURGARD  STORAGE CENTERS,  INC., INVESTOR  RELATIONS, 1201  THIRD AVENUE, SUITE
2200, SEATTLE, WASHINGTON 98101 (TELEPHONE NUMBER: (206) 624-8100).
 
                                       x
<PAGE>
                                    SUMMARY
 
    THE  FOLLOWING  SUMMARY  IS  QUALIFIED  IN  ITS  ENTIRETY  BY  THE  DETAILED
INFORMATION APPEARING ELSEWHERE  IN THIS  PROXY STATEMENT/PROSPECTUS,  INCLUDING
THE   APPENDICES.   UNITHOLDERS  ARE   URGED  TO   CAREFULLY  READ   THIS  PROXY
STATEMENT/PROSPECTUS AND ITS APPENDICES IN  THEIR ENTIRETY BEFORE VOTING ON  THE
MATTERS  DISCUSSED HEREIN. SEE "GLOSSARY OF TERMS" BEGINNING ON PAGE 145 FOR THE
DEFINITIONS  OF  CERTAIN   OF  THE   CAPITALIZED  TERMS  USED   IN  THIS   PROXY
STATEMENT/PROSPECTUS.
 
THE COMPANY
 
    Shurgard  Storage Centers, Inc. is a fully integrated, self-administered and
self-managed real  estate investment  trust that  develops, acquires,  owns  and
manages  self storage centers.  The Company is  one of the  largest operators of
self storage centers  in the United  States. As  of June 30,  1996, the  Company
owned  and operated, directly  and through its  subsidiaries and joint ventures,
185 self storage properties, containing approximately 12.0 million net  rentable
square  feet, which are located in over 20 major metropolitan areas in 19 states
and Europe. In addition,  the Company owns two  business parks and a  commercial
building.  The Company also manages, under  the "Shurgard" name, 88 self storage
centers containing approximately 4.6 million net rentable square feet, of  which
48  are owned by affiliates (including the properties owned by the Partnerships)
and 40 are  owned by nonaffiliates.  The Company  developed 78 of  its owned  or
managed  stores. For the quarter  ended June 30, 1996,  the self storage centers
owned by the Company had a  weighted average net rentable square foot  occupancy
rate  of approximately 87% and  a weighted average annual  rent per net rentable
square foot of $9.09.
 
    The Company began operations as a REIT through the consolidation on March 1,
1994 of 17 publicly held real estate limited partnerships (the  "Consolidation")
that  were  sponsored by  Shurgard Incorporated  (the "Management  Company"). On
March 24, 1995,  the Management Company  merged with and  into the Company  (the
"Management  Company  Merger"),  and the  Company  became  self-administered and
self-managed.
 
    The Company was  incorporated in Delaware  on July 23,  1993. The  Company's
executive  offices  are  located  at 1201  Third  Avenue,  Suite  2200, Seattle,
Washington 98101, and its telephone number is (206) 624-8100.
 
THE PARTNERSHIPS
 
    Each Partnership is  a publicly  held limited partnership  formed under  the
laws  of the State  of Washington for  the purpose of  acquiring, developing and
operating self storage centers and office and business parks. The  Partnerships'
storage  centers are designed  to offer high-quality  storage space for personal
and business  use  at a  competitive  price. The  Partnerships'  properties  are
managed  by  the  Company  and  are operated  under  the  "Shurgard"  name. Each
Partnership's executive offices are  located at 1201  Third Avenue, Suite  2200,
Seattle, Washington 98101, and the telephone number is (206) 624-8100.
 
    IDS1.   IDS1 owns and operates eight self storage properties and holds a 70%
interest in Shurgard Joint Partners II ("SJP II"), which owns four self  storage
properties.  The remaining 30% interest in SJP II is held by the Company. The 12
properties, which are located in six states, contained approximately 764,000 net
rentable square  feet  (including 100%  of  the SJP  II  properties) and  had  a
weighted average net rentable square foot occupancy rate of approximately 89% as
of June 30, 1996 and a weighted average annual rent per net rentable square foot
of $8.92 for the six months ended June 30, 1996. IDS1 was organized on September
29, 1987. See "Business and Properties of the Partnerships -- IDS1."
 
    IDS2.    IDS2 owns  and operates  eight self  storage properties.  The eight
properties, which are  located in five  states, contained approximately  538,000
net  rentable square feet  and had a  weighted average net  rentable square foot
occupancy  rate   of   approximately  89%   as   of   June  30,   1996   and   a
 
                                       1
<PAGE>
weighted  average annual rent per net rentable  square foot of $8.88 for the six
months ended  June  30, 1996.  IDS2  was organized  on  November 15,  1988.  See
"Business and Properties of the Partnerships -- IDS2."
 
    IDS3.   IDS3  owns and  operates 16 self  storage properties  and one office
building. The  17  properties, which  are  located in  seven  states,  contained
approximately  1,000,000 net rentable square feet and had a weighted average net
rentable square foot occupancy rate of approximately 86% as of June 30, 1996 and
a weighted average annual rent per net rentable square foot of $7.87 for the six
months ended  June  30, 1996.  IDS3  was organized  on  November 15,  1988.  See
"Business and Properties of the Partnerships -- IDS3."
 
RISK FACTORS
 
    In  evaluating  the Mergers  and the  Company, Unitholders  should carefully
consider the factors  discussed under  "Risk Factors." Some  of the  significant
factors include:
 
    RISKS RELATING TO THE MERGERS
 
    - The  Company, the General  Partners and their  affiliates have significant
      conflicts of interest in connection  with the Mergers. These conflicts  of
      interest arise because, among other things, certain representatives of the
      General Partners are also officers of the Company.
 
    - The  interests of the Unitholders  have not been independently represented
      in structuring  and negotiating  the terms  of the  Mergers; had  separate
      representation been arranged for the Unitholders, the terms of the Mergers
      might have been different.
 
    - As  a result  of the Mergers,  the nature of  each Unitholder's investment
      will change from an interest in a specified portfolio of properties for  a
      finite  period to an investment in an ongoing fully-integrated real estate
      company, which has a portfolio of properties that may be changed from time
      to time without the  approval of stockholders and  which does not plan  to
      liquidate its assets within a fixed period of time.
 
    - The   Mergers  will  be  treated  as  taxable  events,  resulting  in  the
      recognition by all non-tax-exempt Unitholders of either taxable income  or
      loss,  and no special cash  distributions will be made  for the payment of
      any tax. In addition, Company  distributions to taxable stockholders  will
      be treated as "portfolio income," eliminating the potential tax benefit of
      the   Partnerships  where  passive  income  could  be  passed  through  to
      Unitholders and used, to the  extent permitted under applicable tax  laws,
      to offset passive losses from other sources.
 
    - The  Mergers are expected to affect  the growth and level of distributions
      made to Unitholders  who become  stockholders of the  Company. The  growth
      and,  depending upon the Share Price (as defined in "-- The Mergers -- The
      Mergers") used to determine  the number of Shares  (as defined in "--  The
      Mergers  --  The Mergers")  to  be issued  in  the Mergers,  the  level of
      distributions after the  Mergers to  Unitholders who  have become  Company
      stockholders  may  be lower  than the  level  and growth  of distributions
      received with respect to their Units prior to the Mergers.
 
    - The consideration to be  received by Unitholders  is based in  substantial
      part  on third party  appraisals of the market  value of the Partnerships'
      properties as of December 31, 1995. Appraisals are opinions of value as of
      the date  specified,  are  subject  to certain  assumptions  and  may  not
      represent  the true  worth or  realizable value  of the  properties of the
      Partnerships. The  appraisals do  not  reflect any  change that  may  have
      occurred  in the market value of the properties subsequent to December 31,
      1995. In addition, Unitholders are subject to the risk that the Net  Asset
      Values   (as  defined  in  "--  The   Mergers  --  The  Mergers")  of  the
      Partnerships, which  are based  primarily upon  the independent  appraised
      value  of  the Partnerships'  properties, may  not reflect  the realizable
      value  of   the   Partnerships'   assets   in   an   actual   transaction.
 
                                       2
<PAGE>
      Were this to be the case as to a Partnership, the Merger Consideration (as
      defined  in "-- The Mergers  -- The Mergers") received  by a Unitholder of
      that Partnership may be understated or overstated.
 
    - Certain valuations of the Partnerships performed by Alex. Brown were above
      the aggregate consideration  per Unit to  be issued in  the Mergers  while
      other valuations of the Partnerships that Alex. Brown performed were below
      the  aggregate  consideration to  be issued  per Unit  in the  Mergers. 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 Mergers, 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 per Unit in the Mergers. See "Appraisals and Opinions of  Financial
      Advisors -- Opinion of the Company's Financial Advisor."
 
    - The  Mergers  will  result in  the  elimination of  Unitholders'  right to
      receive a  priority return  and, after  the Mergers,  Unitholders and  the
      General  Partners will be entitled to receive dividends on the Shares they
      receive in the Mergers on the same basis as all other stockholders of  the
      Company.
 
    - If  the average price  of Common Stock  for the designated  period used to
      determine the Share Price is less than  $22.25 per share or if the  market
      price  of the Common Stock decreases  after determination of the number of
      Shares to  be issued  in the  Mergers and  prior to  the issuance  of  the
      Shares,  the market  value of  the Shares  received by  Unitholders in the
      Mergers may be less than the Net Asset Values of the Partnerships.
 
    - The market price of  Common Stock may decrease  following issuance of  the
      Shares  if there is increased  selling activity or as  a result of general
      market conditions or other factors.
 
    - The properties of the  Partnerships may appreciate in  value and might  be
      able  to  be liquidated  at a  later date  for a  price which  would yield
      Unitholders more consideration than they would receive in the Mergers.
 
    - The  Company  could  become  more   highly  leveraged  than  any  of   the
      Partnerships,  resulting in an increase in debt service, an increased risk
      that  the  Company  could  lose  its  interests  in  properties  given  as
      collateral if it defaults on its obligations and an increased risk that it
      may not be able to meet the REIT qualification requirement of distributing
      95% of its REIT taxable income to stockholders.
 
    - A  Unitholder is  entitled to  dissenters' rights  in connection  with the
      Merger of  his or  her Partnership  if the  Unitholder properly  exercises
      dissenters'  rights under  the Washington Uniform  Limited Partnership Act
      (the "WULPA"). However, Unitholders who vote  in favor of the Mergers  are
      not entitled to dissenters' rights.
 
    GENERAL REAL ESTATE INVESTMENT RISKS
 
    - The  Company is subject to general risks relating to real estate ownership
      and operation of self storage centers, including the fact that real estate
      investments  are  generally  illiquid,  as  well  as  the  risks  normally
      associated  with  changes  in  market  rental  rates  and  the  impact  of
      environmental protection laws.
 
    - The Company  is subject  to  risks of  real  estate development,  such  as
      problems  in obtaining necessary permits  and approvals, cost overruns and
      delays in construction, and difficulties and delays in property lease-up.
 
    - The Company is authorized to invest  in commercial real estate other  than
      self  storage centers, exposing  the Company to the  risks unique to these
      investments which may  be different than  the risks of  being in the  self
      storage business.
 
                                       3
<PAGE>
    - The  Company  may acquire  indirect  interests in  real  estate, including
      interests outside the United States, through investments in  partnerships,
      joint ventures, participating mortgages and other legal entities, exposing
      the Company not only to the risk of the underlying real estate investments
      but  also currency risks  and risks associated with  the entity owning the
      real estate.
 
    - The Company is not  expected to have substantial  interests in other  real
      estate  investments to hedge  against the risk  that national trends might
      adversely affect the profitability of self storage facilities.
 
    - Competition may adversely affect the occupancy levels and rental rates  of
      the Company's properties.
 
    - Limited  potential  for  significant occupancy  gains  indicates  that any
      future increases in revenue from  self storage centers currently owned  by
      the Company will be primarily the result of rental rate increases.
 
    - Possible  liability relating  to unknown  environmental matters, including
      the presence of hazardous substances  on a property, may adversely  affect
      the Company's ability to sell the property or to borrow using the property
      as  collateral, and may cause the Company to incur substantial remediation
      or other costs, such  as liabilities resulting from  a claim by a  private
      party  for personal injury  or a claim  by an adjacent  property owner for
      property damage.
 
    - The Company  may be  required to  make capital  expenditures for  building
      alterations  to comply with the Americans  With Disabilities Act, fire and
      safety regulations, building codes and other land use regulations.
 
    - Real property taxes on  properties owned or developed  or acquired in  the
      future by the Company may increase as property tax rates change and as the
      properties are assessed or reassessed by tax authorities.
 
    RISKS RELATING TO QUALIFICATION AND OPERATION AS A REIT
 
    - There  can be no assurance that the  Company will continue to qualify as a
      REIT. If the Company were  to fail to qualify  as a REIT, its  distributed
      income  would be subject to two levels  of taxation which would reduce the
      amount of cash available for distribution to stockholders.
 
    - The Company  may have  taxable  income in  excess  of cash  available  for
      distribution,  and  in  the future  may  be  required to  borrow  money or
      liquidate investments  in  order  to meet  the  distribution  requirements
      necessary to maintain REIT status.
 
    - Legislation,  new  regulations,  administrative  interpretations  or court
      decisions may  significantly  change the  tax  laws with  respect  to  the
      Company's  qualification as a REIT or  the federal income tax consequences
      of such qualification.
 
    OTHER GENERAL RISKS
 
    - The Company manages  86 self  storage properties (including  those of  the
      Partnerships)  under contracts  that generally  may be  terminated without
      cause on 60 days' notice. If these contracts were terminated, the  Company
      would lose management fees and other income and would experience decreased
      economies of scale.
 
    - Market  interest rates may  increase, resulting in  higher yields on other
      financial instruments, which  could adversely affect  the market price  of
      the Common Stock.
 
THE SPECIAL MEETINGS
 
    Each  of the Special Meetings is scheduled  to be held on November 13, 1996,
at  10:00  a.m.,  local  time,  at  1201  Third  Avenue,  Suite  2200,  Seattle,
Washington.  At  each of  the Special  Meetings,  including any  adjournments or
postponements thereof,  Unitholders will  be asked  to consider  and vote  on  a
proposal  to approve the Acquisition Agreement and the transactions contemplated
thereby,
 
                                       4
<PAGE>
providing for  the Merger  of their  respective Partnership  with and  into  the
Company.  Approval of  the Acquisition  Agreement by  IDS2 Unitholders  and IDS3
Unitholders will also constitute approval of those amendments to the  applicable
Partnership's  Partnership Agreement necessary to  effect its respective Merger.
See "The Special Meetings" and "The  Acquisition Agreement -- Amendments to  the
Partnership  Agreements." The closing of each  of the Mergers is not conditioned
upon the closing of any of the other Mergers.
 
    For  each  Partnership,   Unitholders  as   of  the  date   of  this   Proxy
Statement/Prospectus whose Units have not been purchased by the Company pursuant
to  the Offers  (as defined  below) are entitled  to notice  of their respective
Special Meeting. If  Units of a  Partnership are transferred  after the date  of
this  Proxy  Statement/Prospectus but  prior to  the  date of  the Partnership's
Special Meeting or any adjournment or  postponement thereof, and the holders  of
the  transferred Units  are admitted as  substituted Unitholders,  the Notice of
Special Meeting, this Proxy Statement/Prospectus and related information will be
sent to the substituted Unitholders along with notice of their substitution  and
admission. This substitution and admission will terminate the right of the prior
Unitholders  to  vote  on the  approval  of  the Acquisition  Agreement  and the
transactions contemplated thereby,  and any  votes as to  the transferred  Units
must  be made  by the substituted  Unitholders. Unitholders are  entitled to one
vote at  their respective  Special Meeting  or any  adjournment or  postponement
thereof for each Unit of their Partnership held of record by them as of the date
of the Special Meeting or any adjournment or postponement thereof.
 
    For   each  Partnership,   Unitholders  holding   more  than   50%  of  that
Partnership's Units,  in  person  or  by  proxy,  constitute  a  quorum  at  the
applicable  Special Meeting. For IDS1, the  affirmative vote of IDS1 Unitholders
holding more than 75% of the outstanding  IDS1 Units is required to approve  the
Acquisition  Agreement and the transactions  contemplated thereby, including the
IDS1 Merger. For  IDS2, the affirmative  vote of IDS2  Unitholders holding  more
than  50% of the outstanding  IDS2 Units is required  to approve the Acquisition
Agreement and the transactions contemplated  thereby, including the IDS2  Merger
and  the amendment to the IDS2  Partnership Agreement. For IDS3, the affirmative
vote of IDS3 Unitholders holding more than 50% of the outstanding IDS3 Units  is
required  to approve the Acquisition Agreement and the transactions contemplated
thereby, including the  IDS3 Merger and  the amendment to  the IDS3  Partnership
Agreement. For information regarding the solicitation and revocation of proxies,
see  "The Special Meetings  -- The IDS1  Special Meeting," "--  The IDS2 Special
Meeting" and "-- The IDS3 Special Meeting."
 
    As of the date of this Proxy Statement/Prospectus, there were  approximately
148,202  IDS1 Units outstanding  held by approximately  3,477 holders of record,
approximately 115,110 IDS2 Units outstanding held by approximately 2,846 holders
of record and approximately 119,215 IDS3 Units outstanding held by approximately
2,462 holders of record.
 
    As of the date of this  Proxy Statement/Prospectus, the Company owns  65,059
IDS1 Units (approximately 44%), 38,766 IDS2 Units (approximately 34%) and 52,648
IDS3  Units  (approximately 44%).  The Company  intends to  vote such  Units for
approval of the Acquisition Agreement and the transactions contemplated thereby.
 
THE MERGERS
 
    BACKGROUND.  In the fall of 1994, the General Partners began considering the
termination of the Partnership through an acquisition of the Partnerships by the
Company.  The  representatives  of  the  General  Partners  who  considered  the
Partnerships' termination and the acquisition of the Partnerships' assets by the
Company  were also executive officers  of the Company. Between  the fall of 1994
and July  1996, the  General  Partners analyzed  such a  transaction,  including
various  potential structures of  the transaction and  alternatives thereto, and
held meetings  with  representatives  of  the Company  and  IPSC  to  discuss  a
transaction. See "Background and Reasons for the Mergers -- Background."
 
    On  March 25, 1996, in connection with preliminary discussions relating to a
potential business transaction (involving the Company and not the  Partnerships)
which were subsequently terminated,
 
                                       5
<PAGE>
the   Company  and  Public  Storage,  Inc.   ("PS")  entered  into  a  customary
confidentiality and standstill agreement (the "PS Agreement") whereby PS  agreed
that  it would not acquire  any interest in the Company  or any of the Company's
affiliates (including the Partnerships)  for a period of  two years without  the
Company's  consent (preventing PS  from making a competing  tender offer for the
Units or proposing an alternative transaction with the Partnerships without  the
permission  of  the Company).  If  the PS  Agreement  did not  prohibit  PS from
acquiring an interest in the Partnership, it is possible that PS might have made
an offer to  purchase the Units  or acquire the  Partnerships for  consideration
greater  or lesser than  the Merger Consideration,  although neither the General
Partners nor the Company,  at the time  the PS Agreement  was executed, had  any
knowledge  of any plan or intention by PS  to make any such offer in the absence
of the PS Agreement. See "Fairness of  the Merger -- Fairness of the Mergers  to
the Unitholders -- Fairness in View of Standstill Agreement with PS."
 
    On July 1, 1996, based upon the reasons set forth in "Background and Reasons
for  the  Mergers --  Background," "Background  and Reasons  for the  Mergers --
General Partners' Recommendations and Reasons"  and "Fairness of the Mergers  --
Conclusions  of the Special Committee," the  Company and the General Partners on
behalf of their respective Partnerships  executed and delivered the  Acquisition
Agreement.  The Offers (as  defined below) were  made and the  Mergers are being
proposed for approval  (i) to enable  the Company to  acquire the entire  equity
interest in each of the Partnerships and (ii) to give Unitholders an opportunity
(a) to liquidate their Units for cash in the Offers or (b) to continue to own an
economic  interest  in a  portfolio of  properties, including  the Partnerships'
properties, through an acquisition of an  equity interest in the Company in  the
Mergers.
 
    Pursuant  to the Acquisition Agreement, the  Company commenced the Offers on
July 2, 1996. On  September 12, 1996,  the Company completed  (i) a cash  tender
offer  for up to  65,000 of the  outstanding IDS1 Units  by purchasing 63,234 or
approximately 43% of the outstanding IDS1 Units  at $257 net per IDS1 Unit  (the
"IDS1 Offer"), (ii) a cash tender offer for up to 49,000 of the outstanding IDS2
Units by purchasing 37,164 or approximately 32% of the outstanding IDS2 Units at
$222  net per IDS2 Unit (the "IDS2 Offer")  and (iii) a cash tender offer for up
to 52,000 of the  outstanding IDS3 Units by  purchasing 50,609 or  approximately
42%  of the outstanding IDS3 Units at $308  net per IDS3 Unit (the "IDS3 Offer,"
and together with the IDS1 Offer and IDS2 Offer, the "Offers"). The Offers  were
made  and the Mergers are being proposed  for approval (i) to enable the Company
to acquire the entire equity  interest in each of  the Partnerships and (ii)  to
give  Unitholders an opportunity  (a) to liquidate  their Units for  cash in the
Offers subject to  the proration provisions  of the Offers  if greater than  the
maximum number of Units which the Company offered to purchase in the Offers were
validly  tendered, or (b) to continue to own an economic interest in a portfolio
of properties, including the Partnerships' properties, through an acquisition of
an equity interest in the Company in the Mergers.
 
    THE MERGERS.   With respect to  each Partnership, upon  the satisfaction  or
waiver  of the conditions to closing relating to that Partnership, it will merge
with and into the Company, with  the Company continuing as the surviving  entity
(the date of the Merger is referred to as the "Closing Date"). Each Unit of that
Partnership  (other than Units owned  by the Company and  Units, if any, held by
Unitholders who  perfect dissenters'  rights  under the  WULPA and  the  general
partner  interest (the "GP Interest") in that Partnership will be converted into
the right to receive (i) that number of whole shares of Common Stock,  including
associated  preferred  stock  purchase  rights  (the  "Shares"),  calculated  by
dividing  (a)  the  Net  Asset  Value  (as  defined  below)  of  the  applicable
Partnership  that would be allocated to one Unit or the GP Interest, as the case
may be,  if  the Net  Asset  Value were  distributed  in a  dissolution  of  the
Partnership  in accordance with  its Partnership Agreement  (a "Dissolution") by
(b) the Share Price (as defined below), (ii) cash in lieu of a fractional  Share
and  (iii) Additional  Consideration (as defined  below), if any,  that would be
allocated to one  Unit or  the GP Interest,  as the  case may be,  if such  cash
payments  were distributed in  a Dissolution. Depending  upon each Partnership's
Share Price, (i)  each IDS1 Unit  will be  converted into the  right to  receive
between  9.26 and 11.55 Shares,  (ii) each IDS2 Unit  will be converted into the
right to receive between 8.00 and 9.98  Shares and (iii) each IDS3 Unit will  be
converted  into the right to  receive between 11.10 and  13.84 Shares. All Units
owned by the  Company will  be cancelled upon  consummation of  the Mergers.  No
 
                                       6
<PAGE>
certificates  representing fractional Shares will be  issued in the Mergers, but
cash will be paid in lieu  thereof. The Shares to be  issued and the cash to  be
paid   in  lieu  of  fractional  shares   of  Common  Stock  and  as  Additional
Consideration are referred to as the "Merger Consideration." To the extent  that
a  Partnership's Closing  Net Asset  Value exceeds  the Partnership's  Net Asset
Value,  the  Partnership  will  make   cash  distributions  to  its   pre-Merger
Unitholders and General Partner in the amount of the difference.
 
    The  following chart sets forth  the number of shares  of Common Stock to be
received by Unitholders in the  Mergers for each IDS1  Unit, IDS2 Unit and  IDS3
Unit held based upon various assumed Share Prices.
 
<TABLE>
<CAPTION>
              SHARES OF COMMON STOCK TO BE
                 RECEIVED FOR EACH UNIT
             -------------------------------
SHARE PRICE    IDS1       IDS2       IDS3
- -----------  ---------  ---------  ---------
<S>          <C>        <C>        <C>
 $   22.25       11.55       9.98      13.84
     23.00       11.17       9.65      13.39
     24.00       10.71       9.25      12.83
     25.00       10.28       8.88      12.32
     26.00        9.88       8.54      11.85
     27.00        9.52       8.22      11.41
     27.75        9.26       8.00      11.10
</TABLE>
 
    The  "Net Asset Value" of a  Partnership is equal to (i)  the sum of (a) the
appraised fair market value of the real  estate assets of the Partnership as  of
December  31, 1995  (the "Appraised Value")  set forth in  the Summary Portfolio
Appraisal Report dated June 26, 1996  (the "Appraisals"), prepared by Robert  A.
Stanger  &  Co.,  Inc. ("Stanger"),  which  reflected the  value  of in-progress
buildouts and unit conversions, and (b)  the book values of the non-real  estate
assets,  except for amortizable assets, of the Partnership as of March 31, 1996,
less (ii) the sum of (x) the Partnership's liabilities as of March 31, 1996, (y)
the estimated cost remaining  to be incurred  as of March  31, 1996 to  complete
in-progress  buildouts and unit conversions (the  value of which was included in
the Appraised Value) and (z) the estimated  costs of the Offers and the  Mergers
that  would be borne  by the Partnership pursuant  to the Acquisition Agreement,
assuming the applicable Merger is consummated.  See "Fairness of the Mergers  --
Conclusions   of  the  General   Partners"  and  "--   Determination  of  Merger
Consideration."
 
    The "Closing Net Asset Value"  of a Partnership is equal  to (i) the sum  of
(a)  the Appraised Value, (b) the cost incurred to the Closing Date of buildouts
and unit conversions, if  any, that were not  reflected in the Appraised  Value,
and  (c) the book values  of the non-real estate  assets, except for amortizable
assets, of the Partnership as of the Closing Date of the applicable Merger, less
(ii) the sum of (x)  the Partnership's liabilities as  of the Closing Date,  (y)
the  estimated costs remaining to be incurred, if any, as of the Closing Date to
complete the buildouts and unit conversions that were included in the  Appraised
Value and (z) the Partnership's Individual Expenses and pro rata share of Shared
Expenses (as such terms are defined herein).
 
    The "Share Price" for a Partnership is equal to the average of the per share
closing prices of the Common Stock on the NYSE during the 20 consecutive trading
days  ending on the fifth  trading day prior to the  date the General Partner of
the Partnership actually calls for the vote of the Partnership's Unitholders  to
approve the applicable Merger (the "Vote Date"). The Vote Date for a Partnership
will  differ from the date of the  original Special Meeting for that Partnership
if such Special Meeting is adjourned. If the Share Price, however, is less  than
$22.25  per share, then for  purposes of calculating the  number of Shares to be
issued in the applicable Merger, the Share Price will be deemed to equal $22.25,
and if the Share Price  is greater than $27.75 per  share, then for purposes  of
calculating  the number  of Shares  to be issued  in the  applicable Merger, the
Share Price will be  deemed to equal  $27.75 (the range of  $22.25 to $27.75  is
referred to as the "Share Price Range").
 
    In  the event the  Share Price exceeds $28.50  for a particular Partnership,
the Company has  the right  to terminate the  Acquisition Agreement  as to  that
Partnership. In the event the Share Price is
 
                                       7
<PAGE>
less  than  $21.50 for  a particular  Partnership, the  General Partner  of that
Partnership may withdraw its recommendation in favor of the applicable Merger or
terminate  the  Acquisition   Agreement;  provided,  however,   that  prior   to
withdrawing  its recommendation or  terminating the Acquisition  Agreement as to
that Partnership, the  General Partner,  if so  requested by  the Company,  must
adjourn the Special Meeting of the applicable Partnership for up to ten business
days  and the General Partner  may not withdraw its  recommendation if, at least
two business  days prior  to the  date  of the  adjourned Special  Meeting,  the
Company  agrees to  pay an amount  of cash  equal to the  difference between the
actual Share Price and $21.50, multiplied by  the number of Shares to be  issued
in the applicable Merger (the "Additional Consideration").
 
GENERAL PARTNERS' REASONS FOR RECOMMENDING THE MERGERS
 
    THE  GENERAL PARTNER OF EACH PARTNERSHIP  RECOMMENDS THAT UNITHOLDERS OF THE
PARTNERSHIP VOTE FOR APPROVAL OF THE ACQUISITION AGREEMENT AND THE  TRANSACTIONS
CONTEMPLATED  THEREBY. This recommendation is  based upon each General Partner's
belief that (i) the terms of the respective Merger, when considered as a  whole,
are  fair  to the  Unitholders of  the respective  Partnership, (ii)  the Merger
Consideration  being  offered  in  exchange  for  the  Units  constitutes   fair
consideration  for the  interests of the  Unitholders and  (iii) after comparing
certain potential benefits and detriments of the respective Merger with those of
several  alternatives,  the  respective  Merger   is  more  attractive  to   the
Unitholders  than the  alternatives. These beliefs  are based  upon each General
Partner's analysis of  the terms  of the  respective Merger,  assessment of  the
respective  Merger's potential economic impact  upon the Unitholders, comparison
of certain  potential  benefits and  detriments  of the  respective  Merger  and
several  alternatives  to  the respective  Merger  and review  of  the financial
condition and performance of the respective Partnership and the Company and  the
terms of material agreements by which they are bound.
 
IPSC CONSENT
 
    Pursuant  to the  Agreement of  Limited Partnership  of each  of the General
Partners (the "GP  Agreements"), the  general partners  of each  of the  General
Partners  may not have authority  to approve the Mergers  without the consent of
IDS Partnership Services Corporation, a limited  partner of each of the  General
Partners  which is not affiliated with the Company ("IPSC"). Based on its review
of documents, the General  Partners' review of alternatives  to the Mergers  and
the  Stanger Fairness Opinion (as defined below), IPSC consented to the Mergers.
IPSC has certain conflicts of interest in the Mergers and tendered in the Offers
the Units it  had owned.  See "The Acquisition  Agreement --  IPSC Consent"  and
"Conflicts of Interest."
 
EXPECTED BENEFITS FROM THE MERGERS
 
    The  following highlights the  primary benefits the  Mergers are expected to
generate for the Unitholders:
 
    - The Company's  real  estate portfolio  is  substantially larger  and  more
      geographically   diverse  than  any  of  the  Partnerships,  reducing  the
      dependence of  an  investment in  the  Company  on the  performance  of  a
      particular asset or group of assets.
 
    - Unitholders  will receive publicly  traded securities listed  on the NYSE,
      enabling Unitholders to liquidate their  investment in the public  trading
      market to meet personal financial planning objectives.
 
    - Tax  filing for investors is simplified because Company tax information is
      included on Form 1099-DIV rather than the more complicated Schedule K-1.
 
ALTERNATIVES TO THE MERGERS
 
    The following is a  brief discussion of certain  benefits and detriments  of
alternatives to the Mergers that were considered by the General Partners.
 
    LIQUIDATION.   An alternative to the Mergers would be liquidating the assets
of the Partnerships and distributing the net liquidation proceeds to the General
Partners and Unitholders. Liquidating the
 
                                       8
<PAGE>
Partnerships would  result  in  concluding  the  investors'  investment  in  the
Partnerships  within the anticipated  liquidation timeframes for  certain of the
properties in  the  Partnerships'  portfolios  and  somewhat  earlier  than  the
anticipated  liquidation timeframes for other properties. The liquidations would
result  in  the  marketplace   establishing  the  fair   market  value  of   the
Partnerships'  assets. The General Partners believe  that the Mergers are a more
attractive alternative than liquidation  because the Mergers permit  Unitholders
to   participate  in  the  Company's   substantially  larger,  more  diversified
investment portfolio, to benefit  from the Company's  ability to access  capital
markets  and to take advantage of acquisition and development opportunities. The
General Partners  believe  that over  time  Unitholders will  benefit  from  the
Company's  growth opportunities even  though the cumulative  total return on the
Common Stock from the completion of the Consolidation through September 30, 1996
has underperformed the Standard & Poor's 500 Stock Index by approximately  18.7%
based  on  the initial  trading  price of  the  Common Stock.  In  addition, the
estimated transaction costs associated with  the Mergers are significantly  less
than would be incurred in a liquidation of the Partnerships' assets.
 
    CONTINUATION  OF PARTNERSHIPS.  Another alternative  to the Mergers would be
to continue each  of the Partnerships  as a separate  legal entity.  Unitholders
would continue to receive regular quarterly distributions, which are expected to
improve in the foreseeable future. Also, continuation of the Partnerships avoids
those  disadvantages which might be inherent in the Mergers. See "Risk Factors."
The primary  disadvantage with  continuing the  Partnerships is  the failure  to
secure the benefits that the General Partners expect to result from the Mergers.
See  "Background  and Reasons  for  the Mergers  --  Expected Benefits  From the
Mergers." If the Partnerships continue, Unitholders may not have an  opportunity
for  liquidity in the near future and there can be no assurance that Unitholders
will be able to sell their Units  for consideration as attractive as the  Merger
Consideration.
 
    SUPPORT  OF  SECONDARY  MARKET.    Another  alternative  which  would create
liquidity for  Unitholders  desiring to  dispose  of their  investments  in  the
Partnerships  would be  a creation  or support of  the secondary  market for the
Units through limited cash tender offers or repurchase programs sponsored by the
Partnerships. While the  General Partners  believe that  this alternative  might
provide  liquidity for some Unitholders, the terms of the Partnership Agreements
and federal tax laws effectively  prevent this alternative from being  available
with  respect to  a majority of  the Units  in any 12-month  period. The General
Partners believe  that the  benefits of  this alternative  are not  sufficiently
broad-based  to provide an overall solution to the liquidity problem. While this
alternative was  considered  by  the General  Partners,  no  detailed  financial
analysis  was done  that would  allow the General  Partners to  predict with any
degree of certainty the possible impact of this alternative on the value of  the
Units.
 
    REORGANIZATIONS OF PARTNERSHIPS AS SEPARATE REITS.  Reorganizing each of the
Partnerships as a separate corporation taxed as a REIT could provide Unitholders
with some of the advantages to be secured through the Mergers, such as providing
investors in the reorganized entities with some liquidity through the listing of
their  equity securities in  a recognized trading  market and simplified federal
income tax reporting. In addition, these reorganizations could be effected on  a
tax-free   basis,  unlike  the  Mergers,  which   will  be  taxable  events  for
Unitholders. The reorganizations of the  Partnerships would, however, result  in
substantial  costs  and expenses,  and, due  to the  sizes of  the Partnerships,
access to  capital  markets  and  the liquidity  of  the  reorganized  entities'
securities  could be  limited. The  General Partners  believe that  the separate
REITs would  not  provide,  or  would  provide on  a  more  limited  basis,  the
advantages expected from the Mergers.
 
COMPARISON OF MERGER CONSIDERATION TO ALTERNATIVES
 
    To assist Unitholders in evaluating the Mergers, the General Partner of each
Partnership has attempted to compare the Merger Consideration with (i) estimates
of the value of the Units on a liquidation basis assuming that the Partnership's
assets were sold at their Appraised Value or net book value and the net proceeds
distributed  to  the  General Partner  and  Unitholders in  accordance  with the
applicable Partnership Agreement and (ii) estimates of the value of the Units on
a going concern basis  assuming that the Partnership  continued as an  operating
business  and its assets were sold at the end of 2000. Due to the uncertainty in
establishing these values, each General Partner has,
 
                                       9
<PAGE>
in instances it deemed appropriate, established a range of potential values  for
each   alternative,  representing  a  high  and  low  value  for  the  potential
consideration. NO ASSURANCE  CAN BE  GIVEN THAT  THE RANGE  OF POTENTIAL  VALUES
INDICATED ESTABLISHES THE HIGHEST OR LOWEST POSSIBLE VALUE.
 
    The  results of this comparative analysis are summarized in the table below.
The estimated  values  are based  upon  information available  to  each  General
Partner  at  the  time  they  were  computed,  including  historical information
regarding the applicable Partnership and current real estate markets, and  there
can  be no assurance  that the same  conditions analyzed by  each of the General
Partners in  arriving at  the estimates  of value  would exist  at the  time  of
consummation  of the Mergers. In addition,  the estimated values assigned to the
alternatives are based on a variety of assumptions made by each General  Partner
that  relate, among other things, to (i) the  Share Price as of the Closing Date
for the applicable 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,  changes in
capitalization rates used by prospective purchasers, tax law changes,  increased
supply  of  or decreased  demand for  self storage  facilities leading  to lower
occupancy rates or lower  rental rates, the manner  in which the properties  are
sold  and the related  selling costs 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
                                ESTIMATED GOING         ASSUMING PARTNERSHIP
                                 CONCERN VALUE            ASSETS SOLD AT:
                 MERGER           PER UNIT (2)      ----------------------------
              CONSIDERATION   --------------------     APPRAISED      NET BOOK
PARTNERSHIP   PER UNIT (1)      HIGH        LOW        VALUE (3)      VALUE (4)
- -----------  ---------------  ---------  ---------  ---------------  -----------
<S>          <C>              <C>        <C>        <C>              <C>
IDS1            $     257     $     251  $     235     $     253      $     175
IDS2                  222           218        203           217            183
IDS3                  308           304        283           299            192
</TABLE>
 
- ------------------------
(1)  Assumes  the  Share Price  is  within  the Share  Price  Range.  The Merger
    Consideration is payable in  Shares and cash in  lieu of fractional  Shares.
    See "Fairness of the Mergers -- Determination of Merger Consideration."
 
(2)  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 "Fairness of the Mergers -- Comparison of Merger  Consideration
    to  Alternatives -- Going Concern Values."  The per Unit going concern value
    estimates were  calculated  based  upon  the  applicable  General  Partner's
    aggregate   high  and  low  going   concern  value  estimates  allocable  to
    Unitholders  of  $37,128,461  and  $34,777,892  for  IDS1,  $25,126,033  and
    $23,285,941 for IDS2 and $36,242,674 and $33,749,516 for IDS3.
 
(3)  Estimated Liquidation Value at Appraised  Value is based primarily upon the
    Appraisals and adjustments  for non-real estate  assets and liabilities  and
    estimated  selling  costs. See  "Fairness of  the  Mergers --  Comparison of
    Merger Consideration to  Alternatives -- Liquidation  Values." The per  Unit
    liquidation  value at Appraised  Value estimates were  calculated based upon
    the applicable General  Partner's aggregate liquidation  value at  Appraised
    Value  estimate for Unitholders of  $37,422,115, $24,957,589 and $35,638,656
    for IDS1, IDS2 and IDS3, respectively.
 
(4) Estimated Liquidation Value at  Net Book Value is  computed as of March  31,
    1996,  less  estimated  selling  costs.  See  "Fairness  of  the  Mergers --
    Comparison of Merger Consideration  to Alternatives -- Liquidation  Values."
    The  aggregate net book  values of $25,930,707,  $21,011,081 and $22,851,497
    for IDS1,  IDS2 and  IDS3, respectively,  each represent  the value  of  the
    applicable
 
                                       10
<PAGE>
    Partnership's  equity as of March 31,  1996 allocable to Unitholders of that
    Partnership computed in accordance  with GAAP, less  selling costs equal  to
    four percent of the book value of that Partnership's real estate assets.
 
FAIRNESS OF THE MERGERS
 
    The  General  Partner of  each Partnership  believes that  the terms  of the
applicable Merger, when considered  as a whole, are  fair to the Unitholders  of
the  Partnership and the Merger Consideration  offered in exchange for the Units
of the  Partnership constitutes  fair  consideration for  the interests  of  the
Unitholders.  The following  provides a  summary of  the factors  upon which the
General Partners based their conclusions as  to the fairness of the Mergers  and
the Merger Consideration to be received by Unitholders. The General Partners did
not find it practicable to, and did not attempt to, quantify or otherwise assign
relative weights to these factors in reaching their determinations.
 
    - The  Merger Consideration is determined based upon the Net Asset Values of
      the Partnerships, which Net  Asset Values were,  in turn, based  primarily
      upon  the independently appraised values of  the real estate assets of the
      Partnerships.
 
    - Stanger has opined as to the fairness, from a financial point of view,  of
      the Merger Consideration to the Unitholders.
 
    - The  Share Price, which  is used to  determine the number  of Shares to be
      received by Unitholders in the Mergers, is based upon a 20-day average  of
      the  per share  closing prices  of the Common  Stock on  the NYSE, thereby
      reducing the likelihood that the Share Price will be artificially inflated
      or affected by general market volatility.
 
    - If the Share Price is below $21.50 for a Partnership, the General  Partner
      of  that  Partnership  may withdraw  its  recommendation in  favor  of the
      applicable Merger  or  terminate  the Acquisition  Agreement  as  to  that
      Partnership  unless the Company elects to pay the Additional Consideration
      in accordance with the provisions of the Acquisition Agreement.
 
    - The General Partners compared certain potential benefits and detriments of
      the Mergers  with certain  potential benefits  and detriments  of  several
      alternatives  to the  Mergers, including liquidation  of the Partnerships,
      continuation of the  Partnerships, support  of secondary  markets for  the
      Units  of  each Partnership  and  reorganizations of  the  Partnerships as
      separate corporations taxed  as REITs. Based  upon these comparisons,  the
      General  Partners  believe  the  Mergers  are  more  attractive  than  the
      alternatives.
 
    - Certain Merger  expenses  are considered  shared  expenses and  have  been
      allocated   equally  between  the  Company,  on  the  one  hand,  and  the
      Partnerships,  on  the  other  hand,  and  certain  Merger  expenses   are
      considered  individual  expenses to  be paid  by  the party  incurring the
      expenses.  Merger  expenses   allocated  to  the   Partnerships  will   be
      apportioned  to  the  Partnerships  based upon  their  relative  Net Asset
      Values.
 
    - If the  Closing Net  Asset Value  of  a Partnership  is greater  than  the
      Partnership's  Net Asset Value, the difference  will be distributed to the
      pre-Merger  Unitholders  and  General   Partner  of  the  Partnership   in
      accordance with the applicable Partnership Agreement.
 
    - The General Partners have followed the original distribution provisions of
      the  Partnership Agreements  in allocating the  Merger Consideration among
      the Unitholders and General Partner of each Partnership.
 
    - Unitholders  who  are  opposed  to  the  Mergers  who  properly   exercise
      dissenters'  rights under  the WULPA  will be  entitled to  receive a cash
      payment equal to the fair value of their Units.
 
    - The General Partners,  the Company and  their affiliates have  significant
      conflicts  of interest in connection with the Mergers, and no unaffiliated
      representatives were appointed to negotiate
 
                                       11
<PAGE>
      the terms of the Mergers on behalf of any of the Partnerships. The General
      Partners believe, however, that their determination regarding the fairness
      of the  Mergers was  based upon  the proper  exercise of  their  fiduciary
      duties, unaffected by these conflicts of interest.
 
THIRD PARTY OPINIONS
 
    THE  APPRAISALS.   The Partnerships  retained Stanger  to appraise  the fair
market value of  each Partnership's  real estate  portfolio as  of December  31,
1995.  In  preparing the  Appraisals,  Stanger collected  from  the Partnerships
information regarding the  operating history of  the properties, conducted  site
inspections of all of the Partnerships' properties in March 1996 and interviewed
and relied on representations of certain representatives of the Partnerships and
the Company as property manager. Stanger's conclusions are based upon conditions
Stanger  observed  at  the  properties during  its  inspection  and assumptions,
qualifications and limitations Stanger deemed reasonable at the time concerning,
among other things, legal  title, the absence of  physical defects or  hazardous
materials,  future  occupancy,  income  and  competition  with  respect  to each
property.  The  Appraisals  reflect  Stanger's  valuation  of  the  real  estate
portfolios  of the Partnerships as  of December 31, 1995,  in the context of the
information available  on  that  date  as  well  as  the  operating  information
available as of March 31, 1996. Events occurring subsequent to December 31, 1995
could  affect the properties  and assumptions used  in preparing the Appraisals.
The Summary  Portfolio Appraisal  Report  for the  Partnerships is  attached  as
Appendix  B to this Proxy Statement/Prospectus.  See "Appraisals and Opinions of
Financial Advisors -- Portfolio Appraisals of the Partnerships' Properties."
 
    STANGER FAIRNESS OPINION.   The  Partnerships have obtained  from Stanger  a
written  opinion  dated July  1, 1996  (the "Stanger  Fairness Opinion")  to the
effect  that,  as  of  the  date  thereof,  and  subject  to  the   assumptions,
qualifications  and  limitations  contained  therein,  the  consideration  to be
received by  Unitholders in  the Mergers  is  fair to  the Unitholders  of  each
Partnership  from  a financial  point  of view.  The  full text  of  the Stanger
Fairness Opinion is attached as  Appendix C to this Proxy  Statement/Prospectus.
Stanger  was not requested  to, and therefore  did not (i)  select the method of
determining  the  consideration   offered  in   the  Mergers,   (ii)  make   any
recommendation to the Unitholders of the Partnerships with respect to whether to
approve  or  reject the  Mergers or  whether  to exchange  their Units  for cash
through the  Offers or  for Shares  through the  Mergers, or  (iii) express  any
opinion as to the business decision to effect the Mergers or alternatives to the
Mergers,  the  tax  implications of  the  Mergers,  the fairness  of  the Merger
Consideration to be received in the Mergers  if the actual Share Price is  lower
than the low end of the Share Price Range, the allocation of expenses associated
with  the Mergers  and the  Offers between  and among  the Partnerships  and the
Company, or any other terms of  the Mergers other than the Merger  Consideration
to  be  received by  Unitholders.  The Stanger  Fairness  Opinion is  based upon
business, economic, real estate and securities markets, and other conditions  as
of  July 1, 1996, and does not reflect  any changes in those conditions that may
have occurred  since  that  date.  See "Appraisals  and  Opinions  of  Financial
Advisors -- Opinion of the Partnerships' Financial Advisor."
 
COMPARISON OF THE PARTNERSHIPS AND THE COMPANY
 
    The summary information below highlights a number of significant differences
between  the Partnerships and the Company.  See "Comparisons of Partnerships and
Company."
 
    FORM OF ORGANIZATION.   The Partnerships and the  Company are each  vehicles
appropriate  for holding real  estate investments and  afford passive investors,
such as  Unitholders  and  stockholders,  certain  benefits,  including  limited
liability,  a professionally managed portfolio and the avoidance of double-level
taxation on distributed income. The Partnerships are under the control of  their
respective  General  Partners, while  the Company  is governed  by its  Board of
Directors. In addition, there are  significant differences in the tax  treatment
of  the Partnerships as partnerships and the Company as a REIT. See "Comparisons
of Partnerships and Company -- Taxation  of Taxable Investors" and "--  Taxation
of Tax-Exempt Investors."
 
    LENGTH  OF  INVESTMENT.   Unitholders  in  each of  the  Partnerships expect
liquidation of  their  investments  when  the  assets  of  the  Partnership  are
liquidated. In contrast, the Company does not expect to
 
                                       12
<PAGE>
dispose  of its assets within any prescribed periods and, in any event, plans to
retain the net sale proceeds  for future investments. Stockholders are  expected
to achieve liquidity for their investments by trading shares of the Common Stock
in the public market and not through the liquidation of the Company's assets.
 
    NATURE  OF INVESTMENT.  Both the Units and Shares represent equity interests
entitling the holders thereof to participate  in the growth of the  Partnerships
and  the Company, respectively. Distributions and dividends payable with respect
to the Units and Shares depend upon the performance of the Partnerships and  the
Company, respectively.
 
    PROPERTIES   AND  DIVERSIFICATION.    The  real  estate  portfolio  of  each
Partnership was limited to the assets acquired with its initial equity  offering
and   limited  debt  financing.  The  Company  holds  a  real  estate  portfolio
substantially larger  and more  diversified than  the portfolio  of any  of  the
Partnerships  and with the  potential for future  growth through acquisition and
development. An investment in the Company should not be viewed as an  investment
in  a specific pool of  assets, but instead as an  investment in an ongoing real
estate investment business, subject to  the risks normally attendant to  ongoing
real estate ownership and to the risks related to property development.
 
    PERMITTED  INVESTMENTS.  The Company  and the Partnerships have concentrated
their investments almost solely in  self storage facilities. The Amended  Bylaws
of  the Company (the "Bylaws") authorize it to make other commercial real estate
investments (including outside of the United States) or mortgage loans,  secured
by  collateral of  a type in  which the Company  is permitted to  invest, if the
Board  of  Directors  makes  certain  determinations  required  by  the  Bylaws.
Accordingly,  the  Company's  investments  may  be  more  diversified  than  the
investments of the Partnerships. The  investment diversification, if it  occurs,
while  potentially serving  as a  hedge against  the risk  of having  all of the
Company's investments limited to a single asset group, would expose the  Company
to  the risk of owning and operating  assets not directly related to its primary
business.
 
    ADDITIONAL EQUITY.    As  the  Partnerships  are  not  authorized  to  issue
additional  Units  or  other equity  interests,  the  Units are  not  subject to
dilution, except as  provided in  the Partnership Agreements.  In contrast,  the
Company  has  substantial flexibility  to raise  equity  capital to  finance its
businesses and  affairs through  the  sale of  equity securities.  The  Company,
through  the issuance  of new  equity securities,  may substantially  expand its
capital base to  make new real  estate investments. The  issuance of  additional
equity  securities by the  Company may dilute the  interests of stockholders and
the Company may issue Preferred Stock with priorities or preferences over Common
Stock with respect to dividends and liquidation proceeds.
 
    BORROWING POLICIES.   In  conducting its  business, the  Company may  borrow
funds  subject to the limitations on indebtedness contained in the Bylaws of 50%
of its total assets and 300% of its adjusted net worth. The Company may be  more
highly  leveraged than  any of the  Partnerships. Borrowing funds  may allow the
Company to  substantially expand  its asset  base, but  will also  increase  the
Company's  risks due  to its  leveraged investments.  As of  June 30,  1996, the
Company's percentage of debt to total market capitalization was 23%.
 
    RESTRICTIONS  ON  RELATED  PARTY  TRANSACTIONS.    Except  for  transactions
specifically approved in the Partnership Agreements (and which were disclosed in
the  disclosure documents prepared for the offering  and sale of the Units), the
Partnerships are  not authorized  to enter  into transactions  with the  General
Partners and their affiliates unless the transactions are approved in advance by
a   vote  of  the  Unitholders.  The  Bylaws  of  the  Company  contain  similar
restrictions, but the Company may enter  into a transaction with its  directors,
officers  and  significant  stockholders if  the  transaction is  approved  by a
majority of the directors not interested in the matter (including a majority  of
independent  directors) following a determination  that the transaction is fair,
competitive and commercially reasonable. The Bylaws do not require the  approval
of stockholders for entering into transactions with interested parties.
 
                                       13
<PAGE>
    COMPENSATION,  FEES AND DISTRIBUTIONS.  Under the Partnership Agreements and
the Management Services Agreements, each  of the Partnerships pays  compensation
to  its General Partner and fees to the Company. After the Mergers, no fees will
be paid to the Company and the Company will manage the Partnerships'  properties
through   its  employees.  Unlike   Unitholders,  stockholders  realize  certain
efficiencies arising from the Company's  self-managed structure and the  Company
can expand its property holdings without a proportionate increase in the cost of
managing the properties.
 
    MANAGEMENT CONTROL AND RESPONSIBILITIES.  The members of the Company's Board
of  Directors are elected for  three-year terms, with a  portion of the Board of
Directors elected at each annual  meeting of stockholders. The General  Partners
do  not  need  to seek  re-election,  but  instead serve  unless  removed  by an
affirmative vote of Unitholders owning a majority of the Units entitled to vote.
As passive investors, Unitholders and stockholders must rely upon management  of
the  Partnerships and Company,  respectively, for the  prudent administration of
their investments.
 
    MANAGEMENT LIABILITY AND INDEMNIFICATION.   The General  Partner of each  of
the  Partnerships has, under most circumstances, no liability to its Partnership
for acts or omissions it  undertakes when performed in  good faith, in a  manner
reasonably  believed to  be within the  scope of  its authority and  in the best
interests of the  Partnership. Each  General Partner also  has, under  specified
circumstances,  a right to be reimbursed by its Partnership for liability, loss,
damage, costs and expenses  it incurs by virtue  of serving as General  Partner.
Although  the standards  are expressed  somewhat differently,  there are similar
protections from liability available  to directors and  officers of the  Company
when  acting on behalf  of the Company  and rights of  directors and officers to
seek indemnification  from the  Company. In  the Mergers,  the Company  will  be
assuming  all of  the existing and  contingent liabilities  of the Partnerships,
including their obligations to indemnify the General Partners.
 
    VOTING RIGHTS.   Stockholders have  different voting  rights, including  the
right to elect directors on a periodic basis, than the voting rights afforded to
Unitholders.
 
    LIQUIDITY.   The Units  constitute illiquid investments  and Unitholders may
find it difficult to dispose of  their Units, if they wish  to do so, or may  be
obligated to sell the Units at substantial discounts to facilitate the sales. In
contrast, the Common Stock is listed on the NYSE.
 
    TAXATION  OF TAXABLE INVESTORS.  The Partnerships allow full pass-through of
tax benefits resulting in taxable income or loss being taxed only at the partner
level. Unitholders  are taxed  on their  allocable share  of Partnership  income
regardless of the amount of cash distributions. The Company, as a REIT, is taxed
on  income in excess  of dividends paid  to stockholders. Company  losses do not
pass through to stockholders. Stockholders are taxed on cash dividends  received
out  of Company  earnings and profits.  Distributions in excess  of earnings and
profits are taxable to stockholders to the extent they exceed the  stockholders'
basis in his or her Common Stock.
 
    TAXATION  OF TAX-EXEMPT  INVESTORS.  A  tax-exempt Unitholder  is treated as
carrying on the  trade or  business activities of  the Partnership  in which  it
invests.  Income from real estate rental activities will not be characterized as
unrelated business taxable income  ("UBTI") as long  as only customary  services
are   rendered  in  connection  with   the  activities.  Accordingly,  to  avoid
characterization of the  Unitholder's allocable share  of Partnership income  as
UBTI,  the  income received  by the  Partnership  must be  income from  a rental
activity in  which only  customary services  are rendered.  Dividends paid  with
respect to, or gain recognized on a disposition of, the Shares are not UBTI.
 
CONFLICTS OF INTEREST
 
    A  number of conflicts  of interest are inherent  in the relationships among
the Partnerships, the General Partners and the Company and their affiliates. See
"Conflicts of Interest." These conflicts of interest include, among others:
 
    - Since the  general and  limited partners  are  the same  for each  of  the
      General  Partners, they are not in a position to view the proposed Mergers
      solely from the perspective of a single Partnership.
 
                                       14
<PAGE>
    - Because the general and limited partners of the General Partner of each of
      the Partnerships have  a financial interest  in consummating the  Mergers,
      there  is  an  inherent  conflict  of  interest  in  the  General  Partner
      structuring the terms and conditions of  the Mergers and the terms of  the
      Mergers  might  have been  different if  structured  by persons  having no
      financial interest in whether or not the Mergers were consummated.
 
    - Charles K. Barbo, the Chairman, President and Chief Executive Officer  and
      a  stockholder of the Company, is an individual general partner of each of
      the General Partners  and the  sole shareholder and  director of  Shurgard
      General  Partner, Inc. ("SGPI"), the corporate  general partner of each of
      the General Partners. Arthur W. Buerk, a stockholder of the Company, is an
      individual general partner of each  of the General Partners. In  addition,
      certain executive officers of the Company also serve as executive officers
      of SGPI. If all of the Mergers are consummated, the General Partners would
      receive   in  exchange   for  their   general  partner   interest  in  the
      Partnerships, assuming the Share  Price is within  the Share Price  Range,
      Shares  with an aggregate  value of $6,307,000, of  which Charles K. Barbo
      and Arthur W. Buerk would be entitled  to Shares with a value of  $538,300
      and $527,600, respectively.
 
    - Pursuant  to the  terms of  an agreement  executed in  connection with the
      Management Company Merger and assuming the Share Price is within the Share
      Price Range, Messrs.  Barbo and Buerk  and the executive  officers of  the
      Company,  as former stockholders  of the Management  Company, will receive
      Shares upon  consummation of  the Mergers  with a  value of  approximately
      $475,600, $289,400 and $77,900, respectively.
 
    - The  Partnerships'  properties  are  managed by  the  Company  pursuant to
      Management Services Agreements  under which the  Company receives  certain
      fees for its management services.
 
AMENDMENTS TO PARTNERSHIP AGREEMENTS
 
    Approval of the Acquisition Agreement by IDS2 and IDS3 Unitholders will also
constitute   approval  of  those  amendments  to  their  respective  Partnership
Agreements necessary to effect the transactions contemplated by the  Acquisition
Agreement,  including the Mergers. See "The Special Meetings -- The IDS2 Special
Meeting" and  "--  The IDS3  Special  Meeting," "The  Acquisition  Agreement  --
Amendments  to the Partnership  Agreements" and "Background  and Reasons for the
Mergers."
 
DISSENTERS' RIGHTS OF UNITHOLDERS
 
    A Unitholder will be entitled to  dissenters' rights in connection with  the
Merger   of  his  or  her  Partnership  if  the  Unitholder  properly  exercises
dissenters' rights under Section 25.10.900 et  seq. of the WULPA, the full  text
of  which  is attached  as Appendix  E to  this Proxy  Statement/Prospectus. See
"Dissenters' Rights of Unitholders."
 
MATERIAL FEDERAL INCOME TAX CONSIDERATIONS
 
    The Merger involves numerous federal income tax consequences to Unitholders.
See "Material Federal Income Tax Considerations." These material federal  income
tax consequences include:
 
    - Unitholders  who are  subject to income  tax will realize  taxable gain or
      loss in the  Mergers. See  "Estimated Taxable  Gain or  Loss." No  special
      distribution  of cash will be  made to Unitholders for  the payment of any
      tax. Any  gain or  loss  will be  recognized in  the  year the  Merger  is
      consummated.
 
    - For federal income tax purposes, gain resulting from the Merger is treated
      as  being recognized at the Partnership level.  The amount of gain will be
      allocated among  Unitholders based  on the  allocation provisions  of  the
      applicable Partnership Agreement.
 
    - The gain or loss recognized by a Unitholder from the Merger generally will
      be  treated as arising from the sale of assets used in a trade or business
      and will be characterized as capital gain  or loss except to the extent  a
      portion  of  the  amount realized  by  the Unitholder  is  attributable to
      depreciation recapture in Partnership property.
 
                                       15
<PAGE>
    - Unitholders who  are  not subject  to  income  tax will  not  recognize  a
      material amount of UBTI in the Merger.
 
ACCOUNTING TREATMENT
 
    Each  of the  Mergers will  be accounted for  as a  purchase under generally
accepted accounting principles ("GAAP").
 
OWNERSHIP STRUCTURE OF THE PARTNERSHIPS
 
    The following diagram shows the ownership structure of the Partnerships  and
the  General  Partners.  The structure  is  the  same for  each  Partnership. As
reflected in the diagram below, (i) Charles K. Barbo, the Chairman of the Board,
President and Chief Executive  Officer and a stockholder  of the Company, is  an
individual  general  partner  of  each  of the  General  Partners  and  the sole
shareholder and director of SGPI, the  corporate general partner of each of  the
General  Partners, (ii)  Arthur W.  Buerk, a stockholder  of the  Company, is an
individual general partner of each of the General Partners and (iii) the Company
is a limited partner of each of the General Partners.
 
    Under each  of the  Partnership Agreements,  the General  Partner  initially
receives 5% of all Partnership distributions until the Unitholders have received
distributions  equal  to their  capital contributions  plus a  preferred return.
Thereafter, the General Partner receives  20% of all further cash  distributions
and  the  sharing arrangement  between the  partners of  the General  Partner is
revised. The diagram below reflects the initial sharing percentages between  the
General Partner and Unitholders and among the partners of each General Partner.
 
    The  General Partners' percentage interest  in the Merger Consideration will
be based upon these distribution principles. Based upon the Net Asset Values  of
IDS1  and IDS2, the  Unitholders in those Partnerships  will not receive through
the Mergers the  amount of their  undistributed preferred returns.  Accordingly,
the  IDS1 General Partner and the IDS2  General Partner will only be entitled to
5% of the Merger  Consideration paid with respect  to those Partnerships.  Based
upon  the Net Asset Value for IDS3, the IDS3 Unitholders are expected to receive
Merger  Consideration  in  excess  of  their  undistributed  preferred   return,
entitling  the IDS3  General Partner to  20% of some  part, but not  all, of the
Merger  Consideration,  resulting   in  the  IDS3   General  Partner   receiving
approximately  7.5%  of  the  Merger Consideration  with  respect  to  IDS3. See
"Conflicts of Interest--General Partner's Interests."
 
                                       16
<PAGE>
                                    [CHART]
- ------------------------
(1) As of the date of  this Proxy Statement/Prospectus, the Company owns  65,059
    IDS1  Units (approximately 44%),  38,766 IDS2 Units  (approximately 34%) and
    52,648 IDS3 Units (approximately 44%).
 
                                       17
<PAGE>
                 SELECTED FINANCIAL INFORMATION OF THE COMPANY
 
    The  following selected financial information is derived from the historical
consolidated financial statements of  the Company. Selected unaudited  financial
data  for the six  months ended June  30, 1995 and  1996 include all adjustments
(consisting only  of  normal  recurring accruals)  that  the  Company  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  Company's  consolidated  financial  statements  and  other  financial
information incorporated by reference in this Proxy Statement/Prospectus.
 
                         SHURGARD STORAGE CENTERS, INC.
 
<TABLE>
<CAPTION>
                                                PREDECESSOR (1)                                  COMPANY (2)
                                   ------------------------------------------  ------------------------------------------------
                                                                                                        SIX MONTHS ENDED JUNE
                                         YEAR ENDED DEC. 31,        JAN. 1 TO   YEAR ENDED DEC. 31,              30,
                                   -------------------------------  MARCH 1,   ----------------------  ------------------------
                                     1991       1992       1993       1994       1994        1995         1995         1996
                                   ---------  ---------  ---------  ---------  ---------  -----------  -----------  -----------
<S>                                <C>        <C>        <C>        <C>        <C>        <C>          <C>          <C>
(IN THOUSANDS, EXCEPT PER SHARE DATA)
OPERATING DATA:
Total revenue....................  $  60,767  $  67,073  $  72,346  $  12,368  $  66,921  $  96,771    $  45,475    $  51,142
Net income.......................     20,411     22,055     18,284     34,286     17,821     29,572       11,992       15,114
Net income per common share (3)..      38.08      41.15      34.11      63.97       1.05       1.43          .66          .65
Dividends declared per common
 share (3).......................      60.45      56.71      59.57     732.05       1.02       2.38(4)      1.36(5)       .47(6)
</TABLE>
 
<TABLE>
<CAPTION>
                                          DECEMBER 31,              AS OF          DECEMBER 31,                JUNE 30,
                                 -------------------------------  MARCH 1,   ------------------------  ------------------------
                                   1991       1992       1993       1994        1994         1995         1995         1996
                                 ---------  ---------  ---------  ---------  -----------  -----------  -----------  -----------
<S>                              <C>        <C>        <C>        <C>        <C>          <C>          <C>          <C>
BALANCE SHEET DATA:
Total assets...................  $ 416,085  $ 400,182  $ 393,982  $ 391,685  $ 494,590    $ 610,394    $ 585,901    $ 631,562
Total borrowings...............     24,430     24,365     26,016     --        167,137      142,840      132,391      171,140
</TABLE>
 
<TABLE>
<CAPTION>
                                                PREDECESSOR (1)                                  COMPANY (2)
                                   ------------------------------------------  ------------------------------------------------
                                                                                                        SIX MONTHS ENDED JUNE
                                         YEAR ENDED DEC. 31,        JAN. 1 TO   YEAR ENDED DEC. 31,              30,
                                   -------------------------------  MARCH 1,   ----------------------  ------------------------
                                     1991       1992       1993       1994       1994        1995         1995         1996
                                   ---------  ---------  ---------  ---------  ---------  -----------  -----------  -----------
 
<S>                                <C>        <C>        <C>        <C>        <C>        <C>          <C>          <C>
OTHER DATA:
Cash flows provided by (used by):
  Operating activities...........  $  34,095  $  35,437    $35,049  $   5,116  $  29,309  $  46,113    $  20,602    $  23,070
  Investing activities...........      3,136     (5,189)    (5,582)    62,962   (115,169)   (86,311  )   (60,699  )   (31,802  )
  Financing activities...........    (33,736)   (31,635)   (30,269)      (589)    99,021     32,719       33,947        6,797
Funds from operations (7)........     32,991     35,968     39,657      5,980     29,759     45,788       19,574       25,078
<FN>
- ------------------------------
(1)  The Predecessor information reflects the combination of the 17 partnerships
     included in the Consolidation.
(2)  The Company was inactive from January 1 through March 1, 1994.
(3)  Predecessor  "per share" information is based on 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 ending March 31, 1996 was declared in April 1996.
(7)  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 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 Company
     believes FFO is meaningful disclosure as a supplement to net income because
     net income implicitly assumes that the value of assets diminish predictably
     over  time  while  the  Company  believes  that  real  estate  values  have
     historically  risen  or  fallen  with  market  conditions.  FFO  is  not  a
     substitute for  net cash  provided by  operating activities  or net  income
     computed in
</TABLE>
 
                                       18
<PAGE>
 
<TABLE>
<S>  <C>
     accordance with GAAP, nor should it be considered an alternative indication
     of  the Company's operating  performance or liquidity.  In addition, FFO is
     not comparable to "funds from operations"  reported by other REITs that  do
     not   define  funds  from  operations   in  accordance  with  the  National
     Association of  Real  Estate  Investment Trusts'  definition  used  by  the
     Company.
 
     FFO for each of the periods presented is calculated as follows:
 
                                                                                             COMPANY
                                                   PREDECESSOR                  ----------------------------------
                                     ----------------------------------------
                                                                                YEAR ENDED DEC.   SIX MONTHS ENDED
                                         YEAR ENDED DEC. 31,        JAN. 1 TO         31,             JUNE 30,
                                     ----------------------------   MARCH 1,    ----------------  ----------------
                                      1991     1992       1993        1994       1994     1995     1995     1996
                                     -------  -------  ----------   ---------   -------  -------  -------  -------
(IN THOUSANDS)
Net income.........................  $20,411  $22,055   $18,284      $34,286    $17,821  $29,572  $11,992  $15,114
Depreciation and amortization......   13,557   13,650    14,017        2,406     11,452   17,559    8,142   10,524
Deferred financing costs...........      (31)     (43)      (55)          (9)      (694)  (1,120)    (560)    (560)
Nonrecurring items.................     (946 (1)     306(2)    7,411(3)  (30,703)(4)   1,180(5)    (223 (6)   --   --
                                     -------  -------  ----------   ---------   -------  -------  -------  -------
    Funds from operations..........  $32,991  $35,968   $39,657      $ 5,980    $29,759  $45,788  $19,574  $25,078
                                     -------  -------  ----------   ---------   -------  -------  -------  -------
                                     -------  -------  ----------   ---------   -------  -------  -------  -------
</TABLE>
 
    ----------------------------------
    (1) Gain on sale of real estate.
    (2) Loss on condemnation.
    (3) Litigation, hostile takeover and consolidation expenses.
 
    (4)  Litigation, hostile takeover and consolidation expenses of $12,180 less
       $48,223 of gains  in sale  of storage centers  plus incentive  management
       fees of $5,340.
 
    (5) Extraordinary loss on retirement of debt.
 
    (6) Gain on condemnation.
 
                                       19
<PAGE>
                 SUMMARY PRO FORMA CONSOLIDATED FINANCIAL DATA
 
    The  following pro forma consolidated balance sheet data as of June 30, 1996
set forth the effect of  the Mergers as if such  had occurred on June 30,  1996.
The following pro forma consolidated data for the six months ended June 30, 1996
set  forth the effect of the Mergers as if such had occurred on January 1, 1995.
The following pro forma consolidated data  for the year ended December 31,  1995
set forth the effect of certain material transactions of the Company not related
to  the Mergers and the effect of the Mergers as if such had occurred on January
1, 1995.  The  Mergers  will be  accounted  for  under the  purchase  method  of
accounting for business combinations.
 
    The  pro forma consolidated financial  statement data are presented assuming
the purchase by  the Company  of 63,234, 37,164  and 50,609  of the  outstanding
units  of IDS1, IDS2 and IDS3, respectively, as completed on September 12, 1996.
The pro  forma consolidated  financial statement  data assume  that all  of  the
Partnerships participate in the Mergers.
 
    The  pro  forma consolidated  financial statement  data are  not necessarily
indicative of  what  the  Company'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  Company's financial  position  or  results  of
operations  as of or for any future period. The pro forma consolidated financial
statement data should be read in  conjunction with all financial statements  and
pro  forma  financial statements  included elsewhere  herein or  incorporated by
reference in this Proxy Statement/Prospectus.
 
                 SUMMARY PRO FORMA CONSOLIDATED FINANCIAL DATA
<TABLE>
<CAPTION>
                                                             COMPANY
                                   COMPANY      COMPANY    PRE-MERGER      IDS1         IDS2         IDS3
                                  HISTORICAL  ADJUSTMENTS   PRO FORMA   HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS
                                  ----------  -----------  -----------  -----------  -----------  -----------  -----------
<S>                               <C>         <C>          <C>          <C>          <C>          <C>          <C>
(IN THOUSANDS, EXCEPT PER SHARE
 AND SHARE DATA)
SIX MONTHS ENDED JUNE 30, 1996
  Revenue.......................  $   51,142   $   1,184    $  52,326    $   3,278    $   2,255    $   3,673    $  (1,999)
  Net income....................      15,114        (346)      14,768          867          467          644         (127)
  Net income per share (1)......        0.65       (0.01)        0.64       --           --           --           --
  Weighted average shares
   outstanding (1)..............  23,199,023      --       23,199,023       --           --           --        2,607,563
 
YEAR ENDED DECEMBER 31, 1995
  Revenue.......................  $   96,771   $   5,009    $ 101,780    $   6,465    $   4,309    $   7,225    $  (3,911)
  Net income....................      29,582       1,954       31,536        2,503        1,461        1,885       (1,931)
  Net income per share (1)......        1.43        0.78         1.36       --           --           --           --
  Weighted average shares
   outstanding (1)..............  20,675,536   2,518,385   23,193,921       --           --           --        2,607,563
 
AS OF JUNE 30, 1996
  Total assets..................  $  631,562   $  41,447    $ 673,009    $  29,407    $  25,197    $  35,131    $  (6,260)
  Notes payable.................     132,250      41,447      173,697       --            2,831       10,333       --
  Equity........................     438,870      --          438,870       26,248       21,442       23,881       (5,356)
 
<CAPTION>
                                    COMPANY
                                  POST-MERGER
                                   PRO FORMA
                                  -----------
<S>                               <C>
(IN THOUSANDS, EXCEPT PER SHARE
 AND SHARE DATA)
SIX MONTHS ENDED JUNE 30, 1996
  Revenue.......................   $  59,533
  Net income....................      16,619
  Net income per share (1)......        0.64
  Weighted average shares
   outstanding (1)..............  25,806,586
YEAR ENDED DECEMBER 31, 1995
  Revenue.......................   $ 115,868
  Net income....................      35,454
  Net income per share (1)......        1.37
  Weighted average shares
   outstanding (1)..............  25,801,484
AS OF JUNE 30, 1996
  Total assets..................   $ 756,484
  Notes payable.................     186,861
  Equity........................     505,085
</TABLE>
 
- ------------------------------
(1) Calculation is based on an assumption of a $25.00 Share Price.
 
                                       20
<PAGE>
                           COMPARATIVE PER SHARE DATA
 
    The following table sets forth certain comparative per share data:
 
<TABLE>
<CAPTION>
                                        AS OF AND FOR THE YEAR ENDED          AS OF AND FOR THE SIX MONTHS ENDED
                                             DECEMBER 31, 1995                          JUNE 30, 1996
                                   --------------------------------------  ----------------------------------------
                                   NET INCOME    DIVIDENDS    BOOK VALUE   NET INCOME   DIVIDENDS (3)   BOOK VALUE
                                   -----------  ------------  -----------  -----------  --------------  -----------
<S>                                <C>          <C>           <C>          <C>          <C>             <C>
The Company:
  Pre-Merger pro forma (1).......   $    1.33   $    2.38(2)   $   18.73    $     .63    $     .94       $   18.92
  Post-Merger pro forma combined
   (4)...........................        1.37        2.38(2)       19.40          .64          .94           19.57
IDS1:
  Historical (5).................       16.04       19.22         183.44         5.56         9.69          177.11
  Pro forma equivalent (6).......       14.13       24.47         199.44         6.62         9.66          201.18
IDS2:
  Historical (5).................       12.06       16.25         192.34         3.86         8.13          186.29
  Pro forma equivalent (6).......       12.20       21.13         172.28         5.72         8.35          173.78
IDS3:
  Historical (5).................       15.02       18.75         205.67         5.13         9.37          200.32
  Pro forma equivalent (6).......       16.93       29.32         239.02         7.93        11.58          241.10
</TABLE>
 
- ------------------------
(1) Pre-Merger pro forma  per share data are  based on the Company's  historical
    financial  statements adjusted to reflect  the consummation of the following
    transactions as if such had occurred on January 1, 1995: (i) the  Management
    Company  Merger in  March 1995, (ii)  the acquisition  of Shurgard Evergreen
    Limited Partnership in May 1995, (iii) the sale of approximately 4.9 million
    shares of  Common Stock  of the  Company in  June and  July 1995,  (iv)  the
    acquisition  of four storage centers in 1995 and (v) the purchase of 63,234,
    37,164 and  50,609  of  the  outstanding  Units  of  IDS1,  IDS2  and  IDS3,
    respectively,  pursuant to  the Offers. The  1995 pre-Merger  pro forma data
    assume that any additional net income generated by the preceding assumptions
    was distributed to stockholders in  1995. Per share amounts were  calculated
    by  dividing  the pre-Merger  pro forma  data by  the number  of outstanding
    shares of Class A  and Class B  Common Stock of  the Company ("Total  Common
    Stock")  as  of  December  31,  1995  and  June  30,  1996  (23,193,921  and
    23,201,421,  respectively)  and  the  weighted  average  number  of   shares
    outstanding  for the year ended  December 31, 1995 and  the six months ended
    June 30, 1996 adjusted for the transactions described above (23,193,921  and
    23,199,023, respectively).
 
(2)  Amount is  based on  historical dividends  declared by  the Company  in the
    periods indicated. Although it is the Company's intention to continue to pay
    quarterly dividends, the  payment of such  in the future  is subject to  the
    discretion  of the  Company's Board  of Directors,  which may  consider such
    factors as the Company's net  income, financial condition, requirements  for
    qualification as a REIT and other matters it deems relevant.
 
(3) Includes the dividend of $0.47 for the quarter ended June 30, 1996 which was
    declared  in July 1996.  The pro forma  equivalents for IDS1,  IDS2 and IDS3
    also include two dividends.
 
(4) The post-Merger pro forma combined per share data give effect to the Mergers
    by combining the Company's  and the Partnerships' per  share data using  the
    purchase  method of  accounting. Post-Merger outstanding  shares include the
    actual outstanding Total  Common Stock at  June 30, 1996,  and the  weighted
    average shares for the year ended December 31, 1995 and the six months ended
    June 30, 1996 adjusted for the transactions described in footnote (1) above,
    plus  the shares expected to be issued to Unitholders in connection with the
    Mergers (25,808,984 at December 31, 1995  and June 30, 1996, 25,801,484  and
    25,806,586  for the year  ended December 31,  1995 and the  six months ended
    June 30, 1996, respectively).
 
(5) Historical  per share  data  is based  on historical  financial  information
    divided  by  148,202, 115,110  and  119,215 Units  of  IDS1, IDS2  and IDS3,
    respectively.
 
(6) Amounts  represent post-Merger  pro forma  per share  financial  information
    divided  by the exchange ratio of Shares per Unit (approximately 10.28, 8.88
    and 12.32 for IDS1, IDS2 and IDS3, respectively), assuming a Share Price  of
    $25.00.  The exchange ratios were calculated by dividing the Net Asset Value
    per Unit of $257, $222 and $308 for IDS1, IDS2 and IDS3, respectively, by an
    assumed Share Price of $25.00.
 
                                       21
<PAGE>
                DISTRIBUTIONS AND MARKET PRICES OF COMMON STOCK
 
    On May 5, 1995, the Company's Common  Stock began trading on the NYSE  under
the  symbol "SHU." Before May 5, 1995, the Common Stock was quoted on the Nasdaq
National Market ("Nasdaq") under the symbol  "SHUR." The table below sets  forth
the high and low sale prices per share of Common Stock, as reported in published
financial sources, and distributions declared for the fiscal periods indicated.
 
<TABLE>
<CAPTION>
                                                                     PRICE PER SHARE OF
                                                                        COMMON STOCK
                                                                    --------------------  DISTRIBUTIONS
                                                                      HIGH        LOW      DECLARED (1)
                                                                    ---------  ---------  --------------
<S>                                                                 <C>        <C>        <C>
1994
  First Quarter (beginning March 28, 1994)........................  $  24.25   $  21.50    $     .14(2)
  Second Quarter..................................................     24.25      21.00          .44
  Third Quarter...................................................     23.25      20.50          .44
  Fourth Quarter..................................................     23.00      17.75          .44
1995
  First Quarter...................................................     24.00      19.50          .46
  Second Quarter (3)..............................................     24.50      22.63          .46
  Third Quarter...................................................     26.00      22.25          .46
  Fourth Quarter..................................................     27.00      24.75          .56(4)
1996
  First Quarter...................................................     27.50      25.88          .47
  Second Quarter..................................................     26.13      24.13          .47
  Third Quarter...................................................     26.13      23.25         --
  Fourth Quarter (through October 9, 1996)........................     25.88      24.88
</TABLE>
 
- ------------------------
(1) Distributions  declared  by  the  Company's  Board  of  Directors  based  on
    financial results for the quarter specified.
 
(2) The first quarter distribution  reflects one month  of operations after  the
    Consolidation.
 
(3) The  high and  low sales prices  per share  of Common Stock  were $24.00 and
    $22.75, respectively, during the  period from April 1,  1995 through May  4,
    1995,  when the Common  Stock was quoted  on Nasdaq. The  high and low sales
    prices per  share of  Common  Stock were  $24.50 and  $22.63,  respectively,
    during  the period from May 5, 1995,  the date of commencement of trading of
    the Common Stock on the NYSE, through June 30, 1995.
 
(4) Includes the special dividend of $.10 declared in November, 1995.
 
    The percentage of total distributions paid to stockholders in 1994 and  1995
which represented return of capital was 0% and 13.51%, respectively. In order to
maintain  its status as a REIT, the Company was required to distribute a minimum
of $19,304,519 and $30,866,986 in 1994 and 1995, respectively; actual  dividends
paid deduction in 1994 and 1995 were $21,159,283 and $38,414,423, respectively.
 
    The  last reported sale price per share of Common Stock on July 1, 1996, the
last trading day preceding  public announcement of the  Mergers, was $25.38.  On
October  9, 1996,  the last reported  sale price  per share of  Common Stock was
$25.50.
 
    No public market exists for the Units. See "Distributions and Market  Prices
of Units."
 
  UNITHOLDERS ARE URGED TO OBTAIN CURRENT MARKET QUOTATIONS FOR COMMON STOCK.
 
                                       22
<PAGE>
                                  RISK FACTORS
 
    In  evaluating  the Mergers  and the  Company, Unitholders  should carefully
consider the following factors, in addition to other matters set forth elsewhere
or incorporated in this Proxy Statement/ Prospectus by reference.
 
RISKS RELATING TO THE MERGERS
 
    CONFLICTS OF INTEREST. The Company,  the Partnerships, the General  Partners
and  their affiliates have significant conflicts  of interest in connection with
the Mergers,  including  (i)  Charles  K. Barbo,  the  Chairman  of  the  Board,
President  and Chief Executive Officer  and a stockholder of  the Company, is an
individual general  partner  of  each  of the  General  Partners  and  the  sole
shareholder  and director of SGPI, the corporate  general partner of each of the
General Partners, (ii)  Arthur W.  Buerk, a stockholder  of the  Company, is  an
individual  general  partner  of each  of  the General  Partners,  (iii) certain
executive officers  of  the Company  are  executive officers  of  the  corporate
general  partner of each of the General  Partners, (iv) pursuant to the terms of
the Partnership Agreements,  the General  Partners will receive  between 5%  and
7.5%  of the Merger  Consideration in exchange  for their GP  Interests, (v) the
Company and IPSC are limited partners of  each of the General Partners and  will
receive Shares in the Mergers, (vi) pursuant to the Contingent Shares Agreement,
Messrs. Barbo and Buerk and certain executive officers of the Company, as former
stockholders of the Management Company, will receive Shares upon consummation of
the  Mergers and (vii)  the Partnerships' properties are  managed by the Company
pursuant to the Management Services Agreements under which the Company  receives
certain fees for its management services. Assuming the Share Price is within the
Share  Price Range, the General Partners  would receive Shares with an aggregate
value of  $6,307,000 in  exchange for  their general  partner interests  in  the
Partnerships  if all of the  Mergers are consummated, of  which Charles K. Barbo
and Arthur W. Buerk  would be entitled  to Shares with a  value of $538,300  and
$527,600, respectively. See "Conflicts of Interest."
 
    LACK  OF INDEPENDENT  REPRESENTATION.   The terms  of the  Mergers have been
established through negotiations between the  Company and the General  Partners,
which  have significant conflicts  of interest as described  in "-- Conflicts of
Interest." Unitholders  were  not  separately  represented  in  structuring  and
negotiating  the terms  of the  Mergers by  an unaffiliated  representative. Had
separate representation  been arranged  for the  Unitholders, the  terms of  the
Mergers might have been different.
 
    CHANGE  IN  NATURE OF  INVESTMENT.   Unitholders who  receive Shares  in the
Mergers will have  changed the  nature of their  investment. While  each of  the
Partnerships  was  formed  as  a finite-life  investment,  with  the Unitholders
receiving regular  cash distributions  out of  the Partnership's  net  operating
income  and special distributions upon  liquidation of the Partnership's assets,
the Company intends  to operate  for an  indefinite period  of time  and has  no
specific  plans for the  sale of its  assets. Stockholders receive distributions
out of the Company's cash flow from operations, but it is not expected that  any
special  distributions of liquidation  proceeds will be  made. Instead of having
their investments liquidated  through the liquidation  of the Company's  assets,
stockholders may liquidate their investment in the Company only through the sale
of  the Shares and the amount realized through the sale of the Shares may not be
equal to the amount  that would have been  realized by the stockholders  through
the  sale of the Company's assets. Stockholders  are subject to the market risks
of all  public  companies,  particularly  in that  the  value  of  their  equity
securities  will  fluctuate  from time  to  time depending  upon  general market
conditions and the Company's future performance.
 
    MERGERS AS TAXABLE EVENTS; NO SPECIAL  CASH DISTRIBUTION FOR THE PAYMENT  OF
ANY TAX.  For taxable Unitholders, the Mergers will result in the recognition of
either taxable income or loss, and no special cash distribution will be made for
the  payment of any tax. See "Material  Federal Income Tax Considerations -- Tax
Consequences of the Mergers." The following summarizes the tax consequences  for
Unitholders:
 
                                       23
<PAGE>
        MERGERS  AS TAXABLE EVENTS FOR  NON-TAX-EXEMPT UNITHOLDERS.  The Mergers
    will result in the recognition of gain or loss to each Partnership based  on
    the  difference between (i) the  sum of the fair  market value of Shares and
    any cash paid by the  Company as Additional Consideration  and in lieu of  a
    fractional share and the amount of liabilities of the Partnership assumed or
    pertaining  to properties acquired by the Company and (ii) the Partnership's
    adjusted tax basis  in its assets  acquired by the  Company in the  Mergers.
    Each Unitholder (except, as discussed below, certain tax-exempt Unitholders)
    in a Partnership generally will recognize his or her allocable share of gain
    or  loss  in  accordance  with  the  terms  of  the  applicable  Partnership
    Agreement. Furthermore, that Unitholder will  recognize gain on the  receipt
    of  the Shares or cash to the extent  of the excess of the fair market value
    of the Shares and amount  of cash received by  the Unitholder in the  Merger
    over  the Unitholder's adjusted tax  basis in his or  her Units (as adjusted
    after taking into account the Unitholder's  allocable share of gain or  loss
    recognized   by  the  applicable  Partnership  in  the  Mergers).  Any  gain
    recognized on  the  distribution of  the  Shares  or cash  will  be  treated
    substantially  as capital gain.  Gain or loss  recognized by the Unitholders
    will be treated  as passive income  or loss. For  a discussion of  potential
    withholding requirements, see "Material Federal Income Tax Considerations --
    Taxation  of the Company as a REIT  -- Backup Withholding" and "-- State and
    Local Taxes and Withholding."
 
        CONSEQUENCES OF MERGERS TO TAX-EXEMPT UNITHOLDERS.  Based on the General
    Partners' representations that the Partnerships do not hold their properties
    for sale to customers  in the ordinary  course of a  trade or business,  the
    Mergers  will not  result in  recognition of  a material  amount of  UBTI by
    certain tax-exempt Unitholders  that do  not hold  their Units  as a  dealer
    under  Section 512(b)(5)(B) of the Internal Revenue Code of 1986, as amended
    (the "Code"),  or as  "debt-financed property"  within the  meaning of  Code
    Section  514. Certain tax-exempt organizations,  however, do not qualify for
    that treatment.  See  "Material Federal  Income  Tax Considerations  --  Tax
    Consequences of the Merger."
 
        CHANGES  IN  TAX CHARACTERIZATION  OF  DISTRIBUTIONS.   Stockholders are
    taxed on  cash  dividends received  out  of Company  earnings  and  profits.
    Distributions  in excess of earnings and profits are taxable to stockholders
    to the extent  they exceed  the stockholder's basis  in his  or her  Shares.
    Company  distributions to taxable stockholders will be treated as "portfolio
    income," eliminating the  potential tax  benefit of  the Partnerships  where
    passive  income  could be  passed through  to Unitholders  and used,  to the
    extent permitted under applicable  tax laws, to  offset passive losses  from
    other  sources.  Such  dividends will  not  be  treated as  UBTI  to certain
    tax-exempt stockholders. See "Material Federal Income Tax Considerations  --
    Taxation  of the Company as a REIT  -- Taxation of Taxable Stockholders" and
    "-- Taxation of Tax-Exempt Stockholders."
 
    POTENTIAL  DIFFERENCES   BETWEEN   MERGER   CONSIDERATION   AND   REALIZABLE
VALUE.   Unitholders are  subject to the risk  that the Net  Asset Values of the
Partnerships, which are based primarily upon the independent appraised value  of
the  Partnerships'  properties,  do  not reflect  the  realizable  value  of the
Partnerships' assets in an actual transaction. Were this to be the case as to  a
Partnership,   the  Merger  Consideration  received  by  a  Unitholder  of  that
Partnership may be understated  or overstated. Stanger  was engaged to  evaluate
each  Partnership's portfolio of real estate  on a limited scope basis utilizing
the income approach  and the sales  comparison approach to  valuation. The  cost
approach,  another  approach  typically  used  by  appraisers  in  valuing  real
property, was not  utilized by  Stanger. To the  extent that  the cost  approach
would  have produced different  values for the portfolios,  the Net Asset Values
may have varied. Stanger considered the  cost approach to be less reliable  than
the  income approach or the sales comparison approach given the primary criteria
used by  buyers  of  the type  of  property  appraised in  the  Appraisals.  The
Appraisals  are as of December  31, 1995 and have not  been updated to take into
account any developments  since that date,  such as changes  in the  portfolios'
operating results or changes in the yield expectations of prospective purchasers
of such real estate assets, possibly affecting real estate value.
 
    UNCERTAINTY  REGARDING MARKET PRICE  OF COMMON STOCK.   The number of Shares
that will be received by the Unitholders of each Partnership is based in part on
the average market price of the
 
                                       24
<PAGE>
Common Stock for the 20 consecutive trading days ending on the fifth trading day
prior to the Vote Date; provided, however, that the Share Price Range fixes  the
minimum  Share Price  at $22.25  regardless of  the actual  market price  of the
Shares. See "Fairness of the Mergers -- Conclusions of the General Partners" and
"-- Determination of Merger Consideration." Accordingly, if the market price  of
the  Common Stock (i) is less  than $22.25 per share on  the Share Price Date or
(ii) decreases after determination of the number  of Shares to be issued in  the
Mergers  and prior  to issuance of  the Shares,  the market value  of the Shares
received by Unitholders in the Mergers may be less than the Net Asset Values  of
the  Partnerships.  In addition,  the market  value of  the Shares  may decrease
following consummation of the Mergers if there is increased selling activity  or
as a result of general market and other factors.
 
    POTENTIAL  CHANGE IN  GROWTH AND  LEVEL OF  DISTRIBUTIONS.   The Mergers may
affect the growth  and level  of distributions  made to  Unitholders who  become
stockholders of the Company. The growth and, depending upon the Share Price used
to  determine the  number of Shares  to be issued  in the Mergers,  the level of
distributions  after  the  Mergers  to  Unitholders  who  have  become   Company
stockholders  may be lower  than the growth and  level of distributions received
with respect to their Units prior to  the Mergers. See "Fairness of the  Mergers
- -- Distribution Comparison."
 
    CONSIDERATION  DIFFERENT THAN ALEX. BROWN VALUATIONS.  Certain valuations of
the Partnerships performed by Alex. Brown were above the aggregate consideration
to be issued per Unit in the Mergers while other valuations of the  Partnerships
that  Alex. Brown performed were below  the aggregate consideration to be issued
per Unit in the Mergers. In particular, the valuation of the Partnerships  Alex.
Brown  performed in its  analysis of publicly-traded REITs  resulted in a higher
valuation per Unit than the consideration to be issued per Unit in the  Mergers,
whereas  the  valuation of  the  Partnerships it  performed  in its  analysis of
selected real estate acquisitions  resulted in a lower  valuation per Unit  than
the  consideration to  be issued  per Unit in  the Mergers.  See "Appraisals and
Opinions of Financial Advisors -- Opinion of the Company's Financial Advisor."
 
    ELIMINATION OF PRIORITY RETURNS TO UNITHOLDERS.  The Partnership  Agreements
provide  for certain priority returns to Unitholders before each General Partner
is entitled to receive an  increased percentage of the applicable  Partnership's
cash  distributions.  After the  Mergers, Unitholders  will  not be  entitled to
receive any priority  return and Unitholders  and the General  Partners will  be
entitled  to receive dividends on the Shares  they receive in the Mergers on the
same basis as all other stockholders of the Company. See "Conflicts of  Interest
- -- General Partner's Interest."
 
    POTENTIAL  LOSS OF FUTURE APPRECIATION.   The properties of the Partnerships
may appreciate in value and might be able to be liquidated at a later date for a
price which would yield Unitholders  more consideration than they would  receive
in the Mergers.
 
    RISK OF SUBSTANTIAL INDEBTEDNESS.  Each of the Partnerships has adhered to a
policy  of limiting its  borrowings, reducing the  risk of leveraged investments
and allowing a substantial portion of the Partnership's net operating income  to
be  distributed to Unitholders. In contrast, the Company is authorized to borrow
up to 50% of its total assets as defined in the Company's Bylaws. If the Company
incurs substantial debt, it will  be subject to the  risks that (i) the  Company
could lose its interests in properties given as collateral for secured borrowing
if  the required principal and interest payments  are not made when due and (ii)
the Company's obligation to  make principal payments, which  are not treated  as
deductions  for  federal  income tax  purposes,  does  not relieve  it  from the
obligation of distributing at least 95% of the Company's REIT taxable income  to
stockholders in order to maintain its REIT status.
 
    LOSS  OF RELATIVE VOTING POWER.   Both Unitholders and stockholders have one
vote per  Unit and  share of  Common  Stock, respectively.  If the  Mergers  are
completed,  Unitholders will have an investment in an entity larger than each of
the Partnerships and will thus lose relative voting power.
 
    AVAILABILITY OF  DISSENTERS'  RIGHTS.   A  Unitholder will  be  entitled  to
dissenters'  rights in connection with the Merger of his or her Partnership only
if the Unitholder properly exercises dissenters'
 
                                       25
<PAGE>
rights under Section 25.10.900 et  seq of the WULPA, the  full text of which  is
attached  as Appendix E to this Proxy Statement/Prospectus. Unitholders who vote
in favor of the Mergers are not entitled to dissenters' rights. See "Dissenters'
Rights of Unitholders."
 
GENERAL REAL ESTATE INVESTMENT RISKS
 
    GENERAL RISKS  RELATING  TO REAL  ESTATE  OWNERSHIP AND  OPERATION  OF  SELF
STORAGE  CENTERS.  An investment in the Company is subject to the risks incident
to the ownership of real estate-related assets and the operation of self storage
centers. These risks include the fact that real estate investments are generally
illiquid, which  may impact  the  Company's ability  to  vary its  portfolio  in
response  to changes  in economic  and other  conditions, as  well as  the risks
normally associated  with changes  in  market rental  rates  and the  impact  of
environmental protection laws and changes in tax, real estate and zoning laws.
 
    RISKS  OF REAL ESTATE  DEVELOPMENT.  The  Company may invest  new capital or
reinvest sale or refinancing proceeds to develop properties or to purchase newly
constructed properties  that  are  still  in the  lease-up  stage.  Real  estate
development  involves risks in  addition to those involved  in the ownership and
operation of established properties, including  the risks that construction  may
not  be completed  on schedule,  resulting in  increased construction  and other
costs, and  that  properties  may  not  be leased  on  profitable  terms  or  in
accordance  with scheduled lease-up  plans. In addition,  to develop properties,
the Company must  engage appropriate  contractors or subcontractors  or both  to
construct  the  properties,  and  problems may  arise  in  connection  with such
engagements, thereby increasing the  cost of the  construction and resulting  in
delays  in completion. If any  of the above were to  occur to a material extent,
the Company's ability to  make expected distributions  to stockholders would  be
adversely affected.
 
    INVESTMENTS  IN OTHER COMMERCIAL REAL ESTATE.   Although the Company invests
primarily in self  storage properties, it  may also invest  in other  commercial
real estate if such investments are specifically approved by the Company's Board
of Directors. The Company has no present plans to make any such investments. The
authority of the Board of Directors to make such investments permits the Company
flexibility  in selecting appropriate investments and in adjusting to changes in
the  marketplace,  without  requiring  amendments  to  the  Bylaws  or  specific
stockholder approval. Investments in other forms of real estate, if they were to
occur,  will  be  subject  to  the risks  unique  to  such  investments  and, in
particular, the Company must ensure that such investments are managed by persons
having the experience and expertise  necessary for the effective management  and
operation  of those investments.  Unfamiliarity with local  laws, procedures and
practices, or in the operation of such other investments, might adversely affect
the  Company's  FFO  and   its  ability  to   make  expected  distributions   to
stockholders.
 
    INDIRECT  INVESTMENTS.  The Company has  invested and may continue to invest
in real estate by making  participating mortgages or acquiring equity  interests
in  partnerships,  joint ventures  or  other legal  entities  that in  turn have
invested in real  estate constituting appropriate  investments for the  Company.
For example, in 1995 and 1996, the Company invested an aggregate of $7.5 million
(as  of June 30, 1996) in SSC Benelux &  Co. SCS, a Belgian entity that owns and
operates self storage properties in the  Benelux region of Europe. In  addition,
as  of the date of this Proxy Statement/ Prospectus the Company owns 65,059 IDS1
Units, 38,766  IDS2  Units  and  52,648  IDS3 Units.  If  one  or  more  of  the
Partnerships does not elect to participate in the Mergers, the Company may elect
to  hold the Units for an indefinite period  of time. Under the Bylaws, a number
of conditions must be  satisfied before the Company  is permitted to make  these
indirect  investments,  including, among  others, the  requirement that  a joint
investment not jeopardize  the Company's eligibility  to be taxed  as a REIT  or
result  in  the  Company becoming  an  investment company  under  the Investment
Company Act of 1940, as amended.  These indirect investments expose the  Company
to  certain risks  not present  had the  Company invested  directly in  the real
estate, including, among others, currency risks,  the risk that the Company  may
not  have control over the  legal entity that has title  to the real estate, the
possibility that the Company  may invest in an  enterprise that has  liabilities
that are not disclosed at the time of the
 
                                       26
<PAGE>
investment  and the possibility that the Company's investments would be illiquid
and not readily accepted as collateral  by the Company's lenders. Each of  these
risks  might reduce  the Company's  cash flow  or impair  its ability  to borrow
funds, which ultimately  could adversely  affect the Company's  ability to  meet
debt service obligations and make expected distributions to stockholders.
 
    LIMITED ASSET DIVERSIFICATION.  The Company limits its investments primarily
to  self storage properties.  The success of  an investment in  the Company will
depend in large measure on the profitability of these businesses and real estate
investments. The Company is not expected to have substantial interests in  other
real  estate investments  to hedge against  the risk that  national trends might
adversely affect the profitability of self storage facilities.
 
    COMPETITION.   Competition exists  in every  market in  which the  Company's
stores  are located. The Company competes with, among others, national, regional
and numerous local self storage  operators and developers. Such competition  may
adversely  affect the occupancy levels and  the rental revenues of the Company's
self storage properties, which  could adversely affect  the Company's cash  flow
from  operations  and its  ability  to meet  debt  service obligations  and make
expected distributions to  stockholders. The Company  believes that the  primary
competition  for potential customers of any of the Company's self storage stores
comes from other self storage  properties within a three-to-five-mile radius  of
that  store.  The Company  does not  seek  to be  the lowest-price  self storage
provider. Entry into the self  storage business through acquisition of  existing
properties  is relatively  easy for  persons or  institutions with  the required
initial capital. Some of the Company's competitors may have more resources  than
the  Company. Competition may be accelerated  by any increase in availability of
funds for  investment  in real  estate.  Decreases  in interest  rates  tend  to
increase  the availability of funds and  therefore can increase competition. Due
to recent  increases  in  development  of self  storage  properties  in  certain
markets,  the  Company anticipates  that increased  available storage  space may
reduce occupancy levels per storage property within the industry in 1996 or 1997
and further intensify competition among storage providers for available tenants.
The extent  to which  the Company  is  affected by  competition will  depend  in
significant part on local market conditions.
 
    LIMITED POTENTIAL FOR OCCUPANCY GAINS.  Although relatively low increases in
storage   supply  and  continued  increases   in  industry  demand  have  driven
substantial occupancy gains over  the last several  years, the Company  believes
that  significant  future  occupancy gains  will  be difficult  to  achieve with
respect to stabilized properties. The Company anticipates that future  increases
in  revenue from  stabilized properties in  its portfolio will  be primarily the
result of rental  rate increases.  To the  extent that  the existing  properties
continue  to operate profitably, this  will likely stimulate further development
and result  in greater  competition  between the  newly developed  and  existing
properties.
 
    POSSIBLE  LIABILITY  RELATING  TO  ENVIRONMENTAL  MATTERS.    Under  various
federal, state and local laws, ordinances and regulations, an owner or  operator
of  real property may become  liable for the costs  of removal or remediation of
certain hazardous  substances released  on or  in its  property. Such  laws  may
impose  liability without regard  to whether the  owner or operator  knew of, or
caused, the  release of  such  hazardous substances.  Although the  Company  has
received  a Phase I  environmental assessment report for  each of the properties
that it owns, it has  not received such a report  for certain of the  properties
that it manages, where the Company might be considered the operator. The purpose
of  each such report was  to identify, as of the  date of that report, potential
sources  of  contamination  of  the  property  and  to  assess  the  status   of
environmental  regulatory compliance.  In addition,  for some  of the properties
that it owns, the Company has received Phase II environmental assessment reports
consisting of soil testing, subsurface  water sampling, asbestos inspections  or
other   investigations  deemed  appropriate   by  an  independent  environmental
consultant. The presence  of hazardous  substances on a  property may  adversely
affect  the  owner's ability  to  sell such  property  or to  borrow  using such
property as collateral, and it may cause the owner or manager of the property to
incur substantial remediation costs.  In addition to  claims for cleanup  costs,
the  presence of hazardous substances on a property could result in the owner or
manager incurring substantial liabilities  as a result of  a claim by a  private
party  for personal injury or a claim by an adjacent property owner for property
damage. There can be no assurance that any environmental assessments  undertaken
by the Company with
 
                                       27
<PAGE>
respect  to the properties that  it owns and certain  properties that it manages
have revealed all potential environmental  liabilities, that any prior owner  or
operator  of the properties did not  create any material environmental condition
not known to the Company, or that an environmental condition does not  otherwise
exist as to any one or more of the properties that could have a material adverse
effect  on  the  Company's  financial condition  or  results  of  operations. In
addition, there  can  be  no  assurance that  (i)  future  laws,  ordinances  or
regulations  will  not impose  any  material environmental  liability,  (ii) the
current environmental conditions  of the Company's  owned or managed  properties
will  not be  affected by the  condition of  properties in the  vicinity of such
properties (such as  the presence of  leaking underground storage  tanks) or  by
third  parties unrelated to the Company or  (iii) tenants will not violate their
leases by introducing hazardous or toxic substances into the Company's owned  or
managed  properties that could expose the  Company to liability under federal or
state environmental laws.
 
    COST OF COMPLIANCE WITH AMERICANS WITH DISABILITIES ACT AND FIRE AND  SAFETY
REGULATIONS.   All of the  Company's properties are required  to comply with the
Americans With Disabilities Act, and the regulations, rules and orders that  may
be  issued thereunder (the "ADA"). The  ADA has separate compliance requirements
for "public accommodations" and "commercial facilities," but generally  requires
that  buildings be made accessible to persons with disabilities. Compliance with
ADA requirements might require, among  other things, removal of access  barriers
and  noncompliance  could  result  in  the  imposition  of  fines  by  the  U.S.
government, or  an award  of  damages to  private  litigants. In  addition,  the
Company is required to operate its properties in compliance with fire and safety
regulations,  building  codes and  other land  use regulations,  as they  may be
adopted by  governmental  agencies  and  bodies and  become  applicable  to  the
Company's  properties. Compliance with such requirements may require the Company
to make substantial capital expenditures,  which expenditures would reduce  cash
otherwise available for distribution to stockholders.
 
    PROPERTY  TAXES.    Each of  the  Company's  properties is  subject  to real
property taxes.  The real  property  taxes on  these  properties and  any  other
properties  that the Company develops or acquires  in the future may increase as
property tax rates change and as  such properties are assessed or reassessed  by
tax authorities.
 
RISKS RELATING TO QUALIFICATION AND OPERATION AS A REIT
 
    FAILURE  TO REMAIN QUALIFIED AS A REIT.  The Company has elected to be taxed
as a REIT under the  Code, commencing with its  taxable year ended December  31,
1994.  So  long  as  the  Company meets  the  requirements  under  the  Code for
qualification as a REIT each year, the  Company will be entitled to a  deduction
when  calculating its taxable income for dividends paid to its stockholders. For
the  Company  to  qualify  as  a  REIT,  however,  certain  detailed   technical
requirements  must be met  (including certain income,  asset and stock ownership
tests) under Code provisions  for which, in many  cases, there are only  limited
judicial  and administrative interpretations. In  addition, the determination of
various factual  matters and  circumstances not  entirely within  the  Company's
control  may affect its  ability to qualify as  a REIT, and  no assurance can be
given that new legislation, regulations, administrative interpretations or court
decisions  will  not  significantly  change   the  tax  laws  with  respect   to
qualification  as  a  REIT  or  the  federal  income  tax  consequences  of such
qualification. Although  the Company  believes that  it is  organized so  as  to
qualify  as a REIT under the Code and  that it has operated and will continue to
operate in such a manner to so qualify  as a REIT, the highly complex nature  of
the  rules governing REITs, the ongoing importance of factual determinations and
the possibility of future  changes in the  Company's circumstances preclude  any
assurance  that the Company  will so qualify  in any year.  For any taxable year
that the Company  fails to  qualify as a  REIT, it  would not be  entitled to  a
deduction  for dividends  paid to  its stockholders  in calculating  its taxable
income. Consequently,  the  net  assets  of the  Company  and  distributions  to
stockholders  would be substantially reduced  because of the Company's increased
tax liability. Furthermore, to  the extent that distributions  had been made  in
anticipation  of the  Company's qualification  as a  REIT, the  Company might be
required to borrow additional funds or  to liquidate certain of its  investments
in
 
                                       28
<PAGE>
order  to pay the applicable  tax. Should the Company's  qualification as a REIT
terminate, the Company may not be able to elect to be treated as a REIT for  the
four  taxable years following the year  during which the qualification was lost.
See "Material Federal Income Tax Considerations -- Taxation of the Company as  a
REIT."
 
    EFFECT  OF DISTRIBUTION REQUIREMENTS.  To maintain  its status as a REIT for
federal income tax  purposes, the  Company generally  is required  each year  to
distribute  to its stockholders at least 95% of its taxable income. In addition,
the Company is subject to a 4%  nondeductible excise tax on the amount, if  any,
by  which certain distributions paid by it with respect to any calendar year are
less than the sum of 85% of its  ordinary income for such calendar year, 95%  of
its  capital gain net income for the calendar year and any amount of such income
that was not  distributed in  prior years. The  Company may  be required,  under
certain  circumstances, to accrue as income  for tax purposes interest, rent and
other items  treated  as  earned for  tax  purposes  but not  yet  received.  In
addition, the Company may be required not to accrue as expenses for tax purposes
certain items that actually have been paid. It is also possible that the Company
could  realize income, such as income from cancellation of indebtedness, that is
not accompanied by  cash proceeds.  In any such  event, the  Company could  have
taxable   income  in  excess  of  cash   available  for  distribution.  In  such
circumstances, the  Company  could be  required  to borrow  money  or  liquidate
investments  on unfavorable terms in order  to meet the distribution requirement
applicable to  a  REIT.  See  "Material Federal  Income  Tax  Considerations  --
Taxation of the Company as a REIT -- Annual Distribution Requirements."
 
    CHANGES IN TAX LAWS WHICH COULD AFFECT REITS.  Income tax treatment of REITs
may  be modified,  prospectively or  retroactively, by  legislative, judicial or
administrative action at any time. No  assurance can be given that  legislation,
new  regulations,  administrative interpretations  or  court decisions  will not
significantly change the tax laws with respect to the qualification as a REIT or
the federal  income  tax consequences  of  such qualification.  While  any  such
legislation may contain transitional rules that would reduce their impact on the
Company,  it is impossible to  predict whether or in  what form such legislation
may be enacted in the future. See "Material Federal Income Tax Considerations."
 
OTHER GENERAL RISKS
 
    RISKS ASSOCIATED WITH MANAGEMENT OF PROPERTIES.  The Company manages 86 self
storage  properties,  of  which  47  are  owned  by  affiliates  (including  the
Partnerships)  and 39 are owned by nonaffiliates, under contracts that generally
may be terminated with or without cause  on 60 days' notice. If these  contracts
were  terminated, the Company would lose management fee income and other revenue
and, in addition, would experience decreased economies of scale in  advertising,
management and other overhead.
 
    EFFECT  OF  MARKET INTEREST  RATES ON  PRICE OF  COMMON STOCK.   One  of the
factors that influence the price of  the Common Stock in public trading  markets
is  the annual yield from distributions by the Company on the price paid for the
Common Stock as  compared to  yields on  other financial  instruments. Thus,  an
increase  in  market  interest  rates  will result  in  higher  yields  on other
financial instruments,  which could  adversely affect  the market  price of  the
Common Stock.
 
                                       29
<PAGE>
                              THE SPECIAL MEETINGS
 
GENERAL
 
    This  Proxy Statement/Prospectus is  first being mailed  on or about October
15, 1996 to the Unitholders of each  of the Partnerships in connection with  the
solicitation  of  proxies  by  each  of the  General  Partners  for  use  at the
respective Special Meetings  to be  held on November  13, 1996,  at 10:00  a.m.,
local  time, at 1201 Third  Avenue, Suite 2200, Seattle,  Washington, and at any
adjournment or postponement thereof.
 
THE IDS1 SPECIAL MEETING
 
    At the  IDS1  Special Meeting,  including  any adjournment  or  postponement
thereof,  IDS1 Unitholders will be  asked to consider and  vote on a proposal to
approve the  Acquisition Agreement  and the  transactions contemplated  thereby,
including the IDS1 Merger. THE IDS1 GENERAL PARTNER HAS DETERMINED THAT THE IDS1
MERGER IS FAIR TO THE IDS1 UNITHOLDERS AND RECOMMENDS THAT IDS1 UNITHOLDERS VOTE
FOR  APPROVAL  OF THE  ACQUISITION AGREEMENT  AND THE  TRANSACTIONS CONTEMPLATED
THEREBY.
 
    The IDS1  Partnership  Agreement  prohibits  IDS1  from  entering  into  any
transaction  with the IDS1 General Partner or  its "affiliates," as such term is
defined therein (including the Company), not specifically authorized in the IDS1
Partnership Agreement, unless the  terms and conditions  of the transaction  are
disclosed to IDS1 Unitholders in advance and approved by the affirmative vote of
IDS1  Unitholders holding of record more than 75% of the outstanding IDS1 Units.
Accordingly,  approval  of  the  Acquisition  Agreement  and  the   transactions
contemplated  thereby requires the affirmative  vote of IDS1 Unitholders holding
of record more than 75% of the outstanding IDS1 Units.
 
    Unitholders as of  the date  of this Proxy  Statement/Prospectus whose  IDS1
Units  have not been purchased by the Company  in the IDS1 Offer are entitled to
notice of the IDS1 Special Meeting. If IDS1 Units are transferred after the date
of this Proxy  Statement/Prospectus but prior  to the date  of the IDS1  Special
Meeting  or  any adjournment  or postponement  thereof, and  the holders  of the
transferred IDS1 Units are admitted as substituted IDS1 Unitholders, the  Notice
of  Special Meeting, this  Proxy Statement/Prospectus, the  accompanying form of
proxy and related information will be  sent to the substituted IDS1  Unitholders
along  with notice  of their substitution  and admission.  This substitution and
admission will terminate  the right  of the prior  IDS1 Unitholders  to vote  on
approval of the Acquisition Agreement and the transactions contemplated thereby,
and  any votes as to the transferred IDS1  Units must be made by the substituted
IDS1 Unitholders. The IDS1 General Partner does not anticipate the  substitution
of  any new IDS1 Unitholders  other than the Company  with respect to those IDS1
Units it acquired in the IDS1 Offer and  any person who obtains IDS1 Units as  a
result  of intrafamily or testamentary  transfers. IDS1 Unitholders are entitled
to one vote at  the IDS1 Special Meeting  for each IDS1 Unit  held of record  by
them  as  of  the  date  of  the IDS1  Special  Meeting  or  any  adjournment or
postponement thereof.  As  of the  date  of this  Proxy  Statement/  Prospectus,
approximately  148,202  IDS1  Units  were  outstanding  and  held  of  record by
approximately 3,477 IDS1 Unitholders.
 
    If a  proxy card  is returned,  properly signed  and dated,  the IDS1  Units
represented  thereby will be voted in the manner specified on the proxy card. If
an IDS1 Unitholder returns a signed proxy card but does not indicate how his  or
her IDS1 Units are to be voted, the IDS1 Units will be voted FOR approval of the
Acquisition Agreement and the transactions contemplated thereby. Any proxy given
pursuant to this solicitation may be revoked by the person giving it at any time
before  it is voted. Proxies may be revoked  by (i) duly executing a later dated
proxy related to the  same IDS1 Units and  delivering it to Gemisys  Corporation
prior  to the taking of  the vote at the IDS1  Special Meeting, (ii) filing with
Gemisys Corporation, at or  before the taking  of the vote  at the IDS1  Special
Meeting,  a written notice of revocation bearing a later date than the proxy, or
(iii) attending  the  IDS1  Special  Meeting  and  voting  in  person  (although
attendance  at the IDS1 Special  Meeting will not in  and of itself constitute a
revocation of a  proxy). Any subsequent  proxy or written  notice of  revocation
should  be mailed to  Gemisys Corporation at P.O.  Box 3897, Englewood, Colorado
80155-9756, faxed to Gemisys Corporation at 1-800-387-7361 at least one business
day   prior    to   the    Vote   Date    or   hand    delivered   to    Gemisys
 
                                       30
<PAGE>
Corporation  at 7103 S. Revere Parkway,  Englewood, Colorado 80112, at or before
the taking of the vote at the IDS1 Special Meeting. However, in order for  faxed
proxies  or revocations to be effective, Unitholders must also mail the original
proxy or revocation  to Gemisys  for receipt no  later than  five business  days
after the Vote Date.
 
    The  presence, either in person or by proxy, of a majority of the IDS1 Units
constitutes a quorum. The IDS1 Special Meeting may be adjourned for the  purpose
of   permitting  the  Company  to  determine   whether  to  pay  the  Additional
Consideration if the  Share Price  is less than  $21.50 in  accordance with  the
provisions  of the  General Partner  Undertaking (as  defined herein), obtaining
additional proxies or votes or for any other purpose. In the event consideration
of a motion to adjourn the IDS1 Special Meeting to another time and/or place  is
presented at the IDS1 Special Meeting, the persons named in the enclosed form of
proxy  and acting  thereunder will  have discretion  to vote  on such  motion in
accordance with  their best  judgment.  In the  event insufficient  proxies  are
received  by the IDS1 General Partner by the date of the IDS1 Special Meeting to
approve the IDS1 Merger, the persons named on the enclosed form of proxy  intend
to  vote the  IDS1 Units  subject to  such proxies  to adjourn  the IDS1 Special
Meeting to a later date in order  to seek additional proxies. At any  subsequent
reconvening  of the IDS1 Special Meeting, all  proxies will be voted in the same
manner as such proxies would  have been voted at  the original convening of  the
IDS1 Special Meeting (except for any proxies that have theretofore properly been
revoked or withdrawn), notwithstanding that they may have been properly voted on
the same or any other matter at a previous meeting.
 
    As  of the date of this  Proxy Statement/Prospectus, the Company owns 65,059
IDS1 Units or 44%  of the then  outstanding IDS1 Units.  The Company intends  to
vote  these  IDS1  Units  FOR  approval of  the  Acquisition  Agreement  and the
transactions contemplated thereby.
 
THE IDS2 SPECIAL MEETING
 
    At the  IDS2  Special Meeting,  including  any adjournment  or  postponement
thereof,  IDS2 Unitholders will be  asked to consider and  vote on a proposal to
approve the  Acquisition Agreement  and the  transactions contemplated  thereby,
including  the IDS2 Merger and the  amendment to the IDS2 Partnership Agreement.
THE IDS2 GENERAL PARTNER HAS DETERMINED THAT THE IDS2 MERGER IS FAIR TO THE IDS2
UNITHOLDERS AND  RECOMMENDS  THAT IDS2  UNITHOLDERS  VOTE FOR  APPROVAL  OF  THE
ACQUISITION AGREEMENT AND THE TRANSACTIONS CONTEMPLATED THEREBY.
 
    The  IDS2 Partnership  Agreement prohibits the  sale of any  property by the
IDS2 Partnership to the IDS2 General  Partner or its "affiliates," as such  term
is  defined therein (including the Company). Accordingly, in order to consummate
the IDS2  Merger, the  IDS2 Partnership  Agreement must  be amended  to add  the
following subsection to Section 13.3(c):
 
        (iii)  Notwithstanding any provision of  this Agreement, the Partnership
    may merge  with and  into  Shurgard Storage  Centers, Inc.  (the  "Company")
    pursuant  to,  and consummate  all other  transactions contemplated  by, the
    terms of the Acquisition Agreement dated July 1, 1996, between the  Company,
    the  Partnership, IDS/Shurgard Income Growth Partners L.P. and IDS/ Shurgard
    Income Growth Partners L.P. III.
 
    Amendment of  the  IDS2  Partnership Agreement  requires  approval  of  IDS2
Unitholders holding of record more than 50% of the outstanding IDS2 Units. Thus,
approval  of the Acquisition Agreement and the transactions contemplated thereby
requires the affirmative vote  of IDS2 Unitholders holding  of record more  than
50%  of  the  outstanding  IDS2  Units. By  voting  to  approve  the Acquisition
Agreement and the  transactions contemplated thereby,  IDS2 Unitholders will  be
deemed to have voted in favor of the foregoing amendment to the IDS2 Partnership
Agreement.
 
    Unitholders  as of  the date of  this Proxy  Statement/Prospectus whose IDS2
Units have not been purchased by the  Company in the IDS2 Offer are entitled  to
notice of the IDS2 Special Meeting. If IDS2 Units are transferred after the date
of  this Proxy Statement/Prospectus  but prior to  the date of  the IDS2 Special
Meeting or  any adjournment  or postponement  thereof, and  the holders  of  the
transferred  IDS2 Units are admitted as  substitute IDS2 Unitholders, the Notice
of Special Meeting,
 
                                       31
<PAGE>
this Proxy  Statement/Prospectus, the  accompanying form  of proxy  and  related
information  will be sent to the  substituted IDS2 Unitholders along with notice
of their  substitution  and  admission. This  substitution  and  admission  will
terminate  the right of  the prior IDS2  Unitholders to vote  on approval of the
Acquisition Agreement and the transactions  contemplated thereby, and any  votes
as  to  the  transferred  IDS2  Units  must  be  made  by  the  substituted IDS2
Unitholders. The IDS2 General  Partner does not  anticipate the substitution  of
any new IDS2 Unitholders other than the Company with respect to those IDS2 Units
it  acquired in the IDS2 Offer and any person who obtains IDS2 Units as a result
of intrafamily or testamentary transfers.  IDS2 Unitholders are entitled to  one
vote at the IDS2 Special Meeting for each IDS2 Unit held of record by them as of
the date of the IDS2 Special Meeting or any adjournment or postponement thereof.
As  of the date of this  Proxy Statement/ Prospectus, approximately 115,110 IDS2
Units  were  outstanding  and  held  of  record  by  approximately  2,846   IDS2
Unitholders.
 
    If  a proxy  card is  returned, properly  signed and  dated, the  IDS2 Units
represented thereby will be voted in the manner specified on the proxy card.  If
an  IDS2 Unitholder returns a signed proxy card but does not indicate how his or
her IDS2 Units are to be voted, the IDS2 Units will be voted FOR approval of the
Acquisition Agreement and the transactions contemplated thereby. Any proxy given
pursuant to this solicitation may be revoked by the person giving it at any time
before it is voted. Proxies may be  revoked by (i) duly executing a later  dated
proxy  related to the same  IDS2 Units and delivering  it to Gemisys Corporation
prior to the taking of  the vote at the IDS2  Special Meeting, (ii) filing  with
Gemisys  Corporation, at or  before the taking  of the vote  at the IDS2 Special
Meeting, a written notice of revocation bearing a later date than the proxy,  or
(iii)  attending  the  IDS2  Special  Meeting  and  voting  in  person (although
attendance at the IDS2 Special  Meeting will not in  and of itself constitute  a
revocation  of a  proxy). Any subsequent  proxy or written  notice of revocation
should be mailed to  Gemisys Corporation at P.O.  Box 3897, Englewood,  Colorado
80155-9756, faxed to Gemisys Corporation at 1-800-387-7361 at least one business
day  prior to the Vote Date or hand  delivered to Gemisys Corporation at 7103 S.
Revere Parkway, Englewood, Colorado 80112, at  or before the taking of the  vote
at  the IDS2 Special Meeting. However, in order for faxed proxies or revocations
to be effective, Unitholders must also mail the original proxy or revocation  to
Gemisys for receipt no later than five business days after the Vote Date.
 
    The  presence, either in person or by proxy, of a majority of the IDS2 Units
constitutes a quorum. The IDS2 Special Meeting may be adjourned for the  purpose
of   permitting  the  Company  to  determine   whether  to  pay  the  Additional
Consideration if the  Share Price  is less than  $21.50 in  accordance with  the
provisions  of the  General Partner  Undertaking (as  defined herein), obtaining
additional proxies or votes or for any other purpose. In the event consideration
of a motion to adjourn the IDS2 Special Meeting to another time and/or place  is
presented at the IDS2 Special Meeting, the persons named in the enclosed form of
proxy  and acting  thereunder will  have discretion  to vote  on such  motion in
accordance with  their best  judgment.  In the  event insufficient  proxies  are
received  by the IDS2 General Partner by the date of the IDS2 Special Meeting to
approve the IDS2 Merger, the persons named on the enclosed form of proxy  intend
to  vote the  IDS2 Units  subject to  such proxies  to adjourn  the IDS2 Special
Meeting to a later date in order  to seek additional proxies. At any  subsequent
reconvening  of the IDS2 Special Meeting, all  proxies will be voted in the same
manner as such proxies would  have been voted at  the original convening of  the
IDS2 Special Meeting (except for any proxies that have theretofore properly been
revoked or withdrawn), notwithstanding that they may have been properly voted on
the same or any other matter at a previous meeting.
 
    As  of the date of this  Proxy Statement/Prospectus, the Company owns 38,766
IDS2 Units or 34%  of the then  outstanding IDS2 Units.  The Company intends  to
vote  these  IDS2  Units  FOR  approval of  the  Acquisition  Agreement  and the
transactions contemplated thereby.
 
THE IDS3 SPECIAL MEETING
 
    At the  IDS3  Special Meeting,  including  any adjournment  or  postponement
thereof,  IDS3 Unitholders will be  asked to consider and  vote on a proposal to
approve the  Acquisition Agreement  and the  transactions contemplated  thereby,
including the IDS3 Merger and the amendment to the
 
                                       32
<PAGE>
IDS3  Partnership Agreement.  THE IDS3 GENERAL  PARTNER HAS  DETERMINED THAT THE
IDS3 MERGER IS FAIR TO THE IDS3 UNITHOLDERS AND RECOMMENDS THAT IDS3 UNITHOLDERS
VOTE FOR APPROVAL OF THE ACQUISITION AGREEMENT AND THE TRANSACTIONS CONTEMPLATED
THEREBY.
 
    The IDS3 Partnership Agreement requires that a merger of IDS3 be approved by
IDS3 Unitholders owning of record more  than 50% of the outstanding IDS3  Units.
In  addition, the IDS3 Partnership Agreement  prohibits the sale of any property
by the IDS3 Partnership to the IDS3 General Partner or its "affiliates," as such
term is  defined  therein (including  the  Company). Accordingly,  in  order  to
consummate  the IDS3 Merger,  the IDS3 Partnership Agreement  must be amended to
add the following subsection to Section 13.3(c):
 
        (iii) Notwithstanding any provision  of this Agreement, the  Partnership
    may  merge  with and  into Shurgard  Storage  Centers, Inc.  (the "Company")
    pursuant to,  and consummate  all other  transactions contemplated  by,  the
    terms  of the Acquisition Agreement dated July 1, 1996, between the Company,
    the Partnership, IDS/Shurgard Income Growth Partners L.P. and IDS/  Shurgard
    Income Growth Partners L.P. II.
 
    Amendment  of  the  IDS3  Partnership Agreement  requires  approval  of IDS3
Unitholders holding of record more than 50% of the outstanding IDS3 Units. Thus,
approval of the Acquisition Agreement and the transactions contemplated  thereby
requires  the affirmative vote  of IDS3 Unitholders holding  of record more than
50% of  the  outstanding  IDS3  Units. By  voting  to  approve  the  Acquisition
Agreement  and the transactions  contemplated thereby, IDS3  Unitholders will be
deemed to have voted in favor of the foregoing amendment to the IDS3 Partnership
Agreement.
 
    Unitholders as of  the date  of this Proxy  Statement/Prospectus whose  IDS3
Units  have not been purchased by the Company  in the IDS3 Offer are entitled to
notice of the IDS3 Special Meeting. If IDS3 Units are transferred after the date
of this Proxy  Statement/Prospectus but prior  to the date  of the IDS3  Special
Meeting  or  any adjournment  or postponement  thereof, and  the holders  of the
transferred IDS3 Units are admitted as substituted IDS3 Unitholders, the  Notice
of  Special Meeting, this  Proxy Statement/Prospectus, the  accompanying form of
proxy and related information will be  sent to the substituted IDS3  Unitholders
along  with notice  of their substitution  and admission.  This substitution and
admission will terminate  the right  of the prior  IDS3 Unitholders  to vote  on
approval of the Acquisition Agreement and the transactions contemplated thereby,
and  any votes as to the transferred IDS3  Units must be made by the substituted
IDS3 Unitholders. The IDS3 General Partner does not anticipate the  substitution
of  any new IDS3 Unitholders  other than the Company  with respect to those IDS3
Units it acquired in the IDS3 Offer and  any person who obtains IDS3 Units as  a
result  of intrafamily or testamentary  transfers. IDS3 Unitholders are entitled
to one vote at  the IDS3 Special Meeting  for each IDS3 Unit  held of record  by
them  as  of  the  date  of  the IDS3  Special  Meeting  or  any  adjournment or
postponement thereof.  As  of the  date  of this  Proxy  Statement/  Prospectus,
approximately  119,215  IDS3  Units  were  outstanding  and  held  of  record by
approximately 2,462 IDS3 Unitholders.
 
    If a  proxy card  is returned,  properly signed  and dated,  the IDS3  Units
represented  thereby will be voted in the manner specified on the proxy card. If
an IDS3 Unitholder returns a signed proxy card but does not indicate how his  or
her IDS3 Units are to be voted, the IDS3 Units will be voted FOR approval of the
Acquisition Agreement and the transactions contemplated thereby. Any proxy given
pursuant to this solicitation may be revoked by the person giving it at any time
before  it is voted. Proxies may be revoked  by (i) duly executing a later dated
proxy related to the  same IDS3 Units and  delivering it to Gemisys  Corporation
prior  to the taking of  the vote at the IDS3  Special Meeting, (ii) filing with
Gemisys Corporation, at or  before the taking  of the vote  at the IDS3  Special
Meeting,  a written notice of revocation bearing a later date than the proxy, or
(iii) attending  the  IDS3  Special  Meeting  and  voting  in  person  (although
attendance  at the IDS3 Special  Meeting will not in  and of itself constitute a
revocation of a  proxy). Any subsequent  proxy or written  notice of  revocation
should  be mailed to Gemisys Corporation,  at P.O. Box 3897, Englewood, Colorado
80155-9756, faxed to Gemisys Corporation at 1-800-387-7361 at least one business
day   prior    to   the    Vote   Date    or   hand    delivered   to    Gemisys
 
                                       33
<PAGE>
Corporation  at 7103 S. Revere Parkway,  Englewood, Colorado 80112, at or before
the taking of the vote at the IDS3 Special Meeting. However, in order for  faxed
proxies  or revocations to be effective, Unitholders must also mail the original
proxy or revocation  to Gemisys  for receipt no  later than  five business  days
after the Vote Date.
 
    The  presence, either in person or by proxy, of a majority of the IDS3 Units
constitutes a quorum. The IDS3 Special Meeting may be adjourned for the  purpose
of   permitting  the  Company  to  determine   whether  to  pay  the  Additional
Consideration if the  Share Price  is less than  $21.50 in  accordance with  the
provisions  of the  General Partner  Undertaking (as  defined herein), obtaining
additional proxies or votes or for any other purpose. In the event consideration
of a motion to adjourn the IDS3 Special Meeting to another time and/or place  is
presented at the IDS3 Special Meeting, the persons named in the enclosed form of
proxy  and acting  thereunder will  have discretion  to vote  on such  motion in
accordance with  their best  judgment.  In the  event insufficient  proxies  are
received  by the IDS3 General Partner by the date of the IDS3 Special Meeting to
approve the IDS3 Merger, the persons named on the enclosed form of proxy  intend
to  vote the  IDS3 Units  subject to  such proxies  to adjourn  the IDS3 Special
Meeting to a later date in order  to seek additional proxies. At any  subsequent
reconvening  of the IDS3 Special Meeting, all  proxies will be voted in the same
manner as such proxies would  have been voted at  the original convening of  the
IDS3 Special Meeting (except for any proxies that have theretofore properly been
revoked or withdrawn), notwithstanding that they may have been properly voted on
the same or any other matter at a previous meeting.
 
    As  of the date of this  Proxy Statement/Prospectus, the Company owns 52,648
IDS3 Units or 44%  of the then  outstanding IDS3 Units.  The Company intends  to
vote  these  IDS3  Units  FOR  approval of  the  Acquisition  Agreement  and the
transactions contemplated thereby.
 
SOLICITATION OF PROXIES BY SOLICITING AGENT
 
    Shurgard Realty Advisors, Inc. ("SRA"), as the soliciting agent, will  enter
into  a Soliciting Agent Agreement with the  Company under which it will use its
best efforts  to solicit  Unitholders to  approve  the Mergers.  A copy  of  the
Soliciting  Agent Agreement  has been  filed as  an exhibit  to the Registration
Statement. SRA will  not receive any  commissions with respect  to the  Mergers;
however,  all  out-of-pocket expenses  (including  telephone, mailing  and legal
expenses) incurred by SRA will be  treated as solicitation expenses and will  be
reimbursed  to  SRA as  set  forth in  "The  Acquisition Agreement  --  Fees and
Expenses." SRA is wholly owned by Charles K. Barbo. See "Conflicts of Interest."
 
    SRA may be deemed to be an underwriter under the Securities Act. The Company
has agreed  to  indemnify SRA  against  certain liabilities,  including  certain
liabilities  under the Securities  Act and state securities  laws. To the extent
that such  indemnification provisions  purport  to include  indemnification  for
liabilities  under the  Securities Act, in  the opinion of  the Commission, such
indemnification is contrary to public policy and, therefore, unenforceable.
 
INFORMATION AND TABULATION
 
    D.F. King  & Co.,  Inc. has  been engaged  as Information  Agent to  perform
consulting,  administrative and  clerical work  in connection  with the Mergers.
Total fees to the Information Agent are  expected to be in the range of  $75,000
to $200,000. Gemisys Corporation has been engaged by each of the Partnerships to
act as Inspector of Elections and will be responsible for receipt and tabulation
of  proxies. Total fees to the Inspector of  Elections are expected to be in the
range of  $75,000  to $125,000.  The  costs of  the  Information Agent  and  the
Inspector   of  Elections  are  Shared  Expenses  and  will  be  shared  by  the
Partnerships and the Company in  accordance with the Acquisition Agreement.  See
"The Acquisition Agreement -- Fees and Expenses."
 
    Under  the Partnership Agreements,  Unitholders are entitled  to inspect the
books and  records of  their  respective Partnership  at reasonable  times  upon
requisite notice to the General Partner of that Partnership (five business days'
notice   in  the  case  of  IDS1  Unitholders  and  two  business  days'  notice
 
                                       34
<PAGE>
in the case of IDS2 and IDS3 Unitholders). Any Unitholder, upon paying the  cost
of  duplicating and  mailing, is  entitled to a  copy of  the list  of names and
addresses of Unitholders  of his  or her respective  Partnership, including  the
number of Units held by each Unitholder.
 
                     BACKGROUND AND REASONS FOR THE MERGERS
 
BACKGROUND
 
    The  Partnerships  were  organized  to  serve  as  investment  vehicles  for
investors interested  in  a professionally  managed  portfolio of  self  storage
facilities and office and business parks with cash flow and capital appreciation
potential.  The  Partnerships  were  presented  to  Unitholders  as  finite-life
investments, with  the Unitholders  receiving quarterly  cash distributions  and
special  distributions  upon liquidation  of  the real  estate  investments. The
Partnerships expected to dispose of their properties within a period of seven to
nine years after acquisition or  development for IDS1 and  IDS2 and five to  ten
years after acquisition or development for IDS3.
 
    IDS1  was formed  on September  29, 1987  and made  its first  investment in
properties in  1988.  The anticipated  timeframe  for liquidation  of  IDS1  was
1995-1999. IDS2 was formed on November 15, 1988 and made its first investment in
properties  in  1988.  The anticipated  timeframe  for liquidation  of  IDS2 was
1995-2000. IDS3 was formed on November 15, 1988 and made its first investment in
properties in  1991.  The anticipated  timeframe  for liquidation  of  IDS3  was
1996-2004. See "Business and Properties of the Partnerships -- General."
 
    Since  each Partnership  expected to  hold its  investments for  a number of
years after its formation, no efforts to dispose of the properties were made  by
the  General Partner  in the  early years  of the  Partnership's existence. Each
General Partner concentrated its initial efforts on making suitable  investments
for  the Partnership, consistent with  the Partnership's investment policies and
restrictions, and, with the  assistance of the Company  and its predecessor,  on
managing   the  properties  efficiently  to  control  operating  expenses  while
maximizing operating revenues.
 
    In the fall of  1994, because the anticipated  timeframe for liquidation  of
the   Unitholders'  investment  was  approaching,  the  General  Partners  began
considering the termination of  the Partnerships through  an acquisition of  the
Partnerships by the Company. Because the representatives of the General Partners
had  recently completed the Consolidation, they were aware of the long lead time
needed in order to complete such  a transaction and concluded that  commencement
of consideration of the transaction was necessary at that time in order to allow
sufficient  time for analysis, structuring,  preparation of disclosure documents
and regulatory  clearances.  The representatives  of  the General  Partners  who
considered   the   Partnerships'  termination   and   the  acquisition   of  the
Partnerships' assets by the Company were also executive officers of the Company.
The representatives of the General Partners  and the Company recognized that  an
acquisition  might  require  the consent  of  IPSC  under the  terms  of  the GP
Agreements. Consequently, on September 22, 1994, a representative of the Company
sent IPSC  a letter  discussing  potential advantages  and disadvantages  of  an
acquisition  of the Partnerships by the Company  for the appraised values of the
Partnerships, whereby the Unitholders of  the Partnerships would receive  either
cash  or Common  Stock in  exchange for  their Units.  The letter  presented the
following preliminary analyses of values of  the Partnerships and set forth  the
resulting net asset value and net asset value per Unit for each Partnership.
 
<TABLE>
<CAPTION>
                                                                                                    NET ASSET
                                                                                                      VALUE
                                                   PROPERTY VALUE           NET ASSET VALUE          PER UNIT
                                              ------------------------  ------------------------  --------------
<S>                                           <C>                       <C>                       <C>
IDS1........................................  $   31.8 - $35.2 million  $   30.4 - $33.5 million   $ 205 - $226
IDS2........................................      24.6 -  27.2 million      20.9 -  23.4 million     182 -  203
IDS3........................................      39.7 -  43.8 million      26.1 -  30.1 million     219 -  252
</TABLE>
 
    For  purposes of the letter, net asset value was comprised of the sum of the
Company's internal estimates of the Partnerships' properties value and the  book
value  of  the  Partnerships'  non-real  estate  assets  less  the  sum  of  the
Partnerships' liabilities  and estimated  transaction costs.  The analyses  were
 
                                       35
<PAGE>
based  upon the Partnerships' 1994 budgeted  net operating income adjusted based
upon the Partnerships' 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 Company concerning how or if IPSC and
the Company might wish to  proceed. At the time the  initial letter was sent  to
IPSC  in 1994, the Company and Shurgard Incorporated, the manager of the Company
at that time, were negotiating the terms of the Management Company Merger  which
was  completed in  March 1995. Although  representatives of the  Company and the
Partnerships had occasional discussions with representatives of IPSC  concerning
the  business of  the Partnerships thereafter,  they did not  pursue a potential
transaction due to the involvement of the representatives of the Company in  the
Management Company Merger.
 
    On  or  about June  22, 1995,  representatives of  the Company,  the General
Partners and IPSC held a meeting in which they discussed the possibility of  the
Partnerships   merging  with  the  Company  and  other  alternatives,  including
liquidation of the Partnerships, designed  to enable the Unitholders to  realize
value  for their Units. The meeting was  inconclusive, but the parties agreed to
continue to analyze alternatives for Unitholders in the Partnerships.
 
    On July 18, 1995, Charles  K. Barbo, on behalf  of the Partnerships, sent  a
letter  to IPSC providing an analysis of alternative means to permit Unitholders
to realize value for  their Units, including a  merger of the Partnerships  with
the  Company,  a  liquidation of  the  Partnerships  and a  continuation  of the
business of the Partnerships.  Mr. Barbo recommended  that the General  Partners
consider,  as the  preferred alternative, mergers  of the  Partnerships with the
Company in which Unitholders would receive Common Stock or cash in the amount of
their respective Partnership's  net asset value  per Unit. The  net asset  value
would be based in substantial part on an independent appraisal of the properties
of  each of the  Partnerships. The letter  emphasized that no  decision had been
made to proceed with any transaction.
 
    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  Company) 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  Partnerships' 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 Company,
based  on the respective net  asset values of the  Partnerships; net asset value
would be determined based  upon an appraisal of  each Partnership's real  estate
assets  as adjusted  for the  Partnership's other  assets and  liabilities; upon
completion of  the  merger,  the  Partnerships would  make  a  liquidating  cash
distribution  to partners  in order  to reconcile  each 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  meetings of  Unitholders; the  merger
would  require the approval of 75% of Unitholders  of IDS1 and a majority of the
Unitholders in IDS2 and IDS3; 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 each 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.
 
                                       36
<PAGE>
    The letter presented the following preliminary analyses of the value of  the
Partnerships'  properties and  set forth the  resulting net asset  value and net
asset value per Unit for each Partnership:
 
<TABLE>
<CAPTION>
                                                                                                    NET ASSET
                                                                                                      VALUE
                                                   PROPERTY VALUE           NET ASSET VALUE          PER UNIT
                                              ------------------------  ------------------------  --------------
<S>                                           <C>                       <C>                       <C>
IDS1........................................  $   37.0 - $38.8 million  $   36.3 - $38.2 million   $ 230 - $245
IDS2........................................      26.6 -  28.0 million      22.8 -  24.1 million     190 -  200
IDS3........................................      43.6 -  45.8 million      32.7 -  34.8 million     260 -  280
</TABLE>
 
    For purposes of the letter, net asset value was comprised of the sum of  the
Company's  internal valuation of the Partnerships' properties and the book value
of the Partnerships' non-real  estate assets less the  sum of the  Partnerships'
liabilities  and estimated transaction  costs. The analyses  were based upon the
Partnerships' 1995  budgeted  net  operating  income  adjusted  based  upon  the
Partnerships' 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 Company's then-current distribution rate of $.46 per share, assuming a share
price  of $23. Based upon these assumptions, dividends would range from 5% below
to 5% above then-current IDS1 distributions,  9% below to 2% above  then-current
IDS2  distributions and  8% to  18% above  then-current IDS3  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
Company.
 
    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
Company.  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  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 Company 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 Company would  provide Unitholders with an opportunity  to
participate  in the benefits of publicly traded REITs in general and the Company
in particular.
 
    The letter also discussed the benefits  and detriments of a continuation  of
the  operation of  the Partnerships 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 Company'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.
 
    IPSC  subsequently asked the General Partners  for an analysis of the impact
on the partners of the General Partners  with respect to their interests in  the
Partnerships  of the alternatives  discussed in the July  18 letter. The General
Partners provided that  analysis to IPSC  in a letter  dated November 10,  1995.
Thereafter,  the  parties agreed  that  they would  be  willing to  have further
discussions after the beginning of the new year.
 
                                       37
<PAGE>
    In January and  February 1996, the  General Partners and  IPSC continued  to
explore  the possibility of a merger involving the Partnerships and the Company.
In late February  1996, the  General Partners determined  that the  Partnerships
should  engage an appraiser  and an investment advisor  to assist in considering
the possibility of pursuing a transaction with the Company.
 
    On February 28, 1996, Everest Storage Investors, LLC ("Everest") commenced a
tender offer for  Units of the  Partnerships (the "Everest  Tender Offer").  The
cash  consideration offered by Everest (i) to  the IDS1 Unitholders was $110 per
Unit, which was 27% to  44% below the prices at  which the IDS1 Units were  then
traded  during the first quarter  of 1996 on the  secondary market and 57% below
the price paid by the  Company in the IDS1 Offer,  (ii) to the IDS2  Unitholders
was $120 per Unit, which was 26% to 35% below the prices at which the IDS2 Units
were  then traded during the  first quarter of 1996  on the secondary market and
46% below the price paid by the Company in the IDS2 Offer, and (iii) to the IDS3
Unitholders was $112 per Unit,  which was 32% to 44%  below the prices at  which
the  IDS3  Units  were then  traded  during the  first  quarter of  1996  on the
secondary market and 64% below the price paid by the Company in the IDS3  Offer.
The General Partners advised Unitholders not to accept the Everest Tender Offer.
Through  the  Everest Tender  Offer, Everest  acquired a  total of  1,816.5 IDS1
Units, 1,931.3 IDS2  Units and  1,582.5 IDS3 Units  (collectively, the  "Everest
Tendered Units").
 
    On  March  8, 1996,  the General  Partners, on  behalf of  the Partnerships,
engaged Stanger to provide opinions as to the fairness to the Unitholders,  from
a  financial  point of  view,  of the  consideration  that might  be  offered to
Unitholders in a potential transaction with the Company and to render appraisals
as to  the fair  market  values of  the  Partnerships' real  estate  portfolios.
Stanger  previously  conducted  appraisals and  provided  fairness  opinions and
special reports  to affiliates  of  the General  Partners  with respect  to  the
Consolidation. See "Appraisals and Opinions of Financial Advisors."
 
    On  March 14, 1996,  representatives of the  General Partners, IPSC, Stanger
and the Partnerships  met to  discuss the terms  on which  the General  Partners
would  consider  an acquisition  of the  Partnerships by  the Company  through a
one-step merger of the Partnerships into the Company. The discussion centered on
a transaction  in which  Unitholders would  receive, at  their election,  Common
Stock  or cash equal to their respective Partnership's net asset value (based on
an independent appraisal)  per Unit. On  March 18, 1996,  legal counsel for  the
Partnerships  provided the Company  with a draft of  an agreement reflecting the
terms discussed by the parties.
 
    On March 19, 1996,  at a regular  meeting of the Board  of Directors of  the
Company,  the  Board  discussed  the possible  acquisition  of  the Partnerships
through a merger. The  directors were informed by  management of the Company  of
the  potential  conflicts  of  interest  involved  in  a  transaction  with  the
Partnerships. See "Conflicts of Interest."  The Board confirmed the  appointment
of  a special committee (the "Special  Committee") consisting of two independent
directors, Donald  W. Lusk  and Wendell  J. Smith,  and authorized  the  Special
Committee  (i)  to review,  evaluate  and negotiate  the  terms of  any proposed
transactions involving the acquisition of the Partnerships by the Company,  (ii)
to  make a recommendation to the Board of Directors with respect to the approval
or  disapproval  of  any  proposed  transaction  between  the  Company  and  the
Partnerships,  and  (iii)  to  select and  retain  legal  counsel  and financial
advisors. Thereafter, the Special Committee decided to retain Alex. Brown & Sons
Incorporated ("Alex. Brown") to assist in its evaluation of any transaction with
the Partnerships and also retained legal counsel to assist in its  consideration
and negotiation of any transaction with the Partnerships.
 
    On  March 25, 1996, in connection with preliminary discussions relating to a
potential business transaction (involving the Company and not the  Partnerships)
which were subsequently terminated, the Company and Public Storage, Inc. entered
into a customary confidentiality and standstill agreement whereby PS agreed that
it  would  not acquire  any interests  in the  Company or  any of  the Company's
affiliates (including the Partnerships)  for a period of  two years without  the
Company's  consent (preventing PS  from making a competing  tender offer for the
Units or proposing an alternative transaction with the Partnerships without  the
permission of the Company). Soon thereafter, PS disclosed to the Company that PS
had  an agreement with Everest, whereby PS  had agreed to purchase the interests
owned  by  Everest  in  various  public  limited  partnerships,  including   the
Partnerships,  owning self storage assets. Pursuant  to a letter agreement dated
April 1, 1996, the Company consented to PS's acquisition of the Everest Tendered
Units   as    well    as    other    Units   owned    by    Everest,    for    a
 
                                       38
<PAGE>
total  of  1,824.5  IDS1  Units,  2,038.3  IDS2  Units  and  1,602.5  IDS3 Units
(collectively, the  "Everest Units"),  on the  condition that  PS grant  to  the
Company  a right to purchase the Everest Units on terms substantially similar to
those on  which PS  acquired the  Everest Units  from Everest.  PS acquired  the
Everest  Units from Everest  on May 20, 1996  at a price of  $200 per IDS1 Unit,
$180 per IDS2 Unit and $190 per  IDS3 Unit. The Company exercised its option  to
acquire the Everest Units from PS at the same price, plus four days of interest,
and  PS transferred  the Everest Units  to the  Company effective as  of May 20,
1996.
 
    From late March 1996  through May 1996, representatives  of the Company  and
the  Partnerships discussed the possibility of  the Company'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 Company  in  which Unitholders  would receive  Shares  in
exchange  for their Units. 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 Unitholders  and
registration of the Shares) that would not be conditions to a cash tender offer.
Thus,  the two-step transaction would provide Unitholders with an opportunity to
obtain liquidity for  a portion  of their Units  more quickly  than waiting  for
completion   of  the  merger.  In  addition,  the  Company  favored  a  two-step
transaction because it believed that such  structure might enable it to  acquire
an ownership position in each of the Partnerships more quickly than would be the
case  in a one-step merger and would enable the Company 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 Company
acquire each of the Partnerships for a price equal to their respective net asset
value, pursuant to a cash tender offer for up to a designated percentage of  the
outstanding Units followed by a merger in which Unitholders would receive Shares
with  a  value  equal  to the  per  Unit  net asset  value  of  their respective
Partnership. The value attributable to a Share was proposed to be the average of
the closing prices for  a Share on  the NYSE during  a designated future  period
(the  "Average Price"). The parties discussed  the provision in each Partnership
Agreement which prohibits  the transfer  of any  Unit 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 Partnership  capital
and profits in a twelve-month period. The parties concluded that they should set
the  percentage of Units that would be sought  in the first step tender offer so
that if the offer were fully subscribed, the number of Units sold to the Company
would not result in a termination of any of the Partnerships and thus the  Units
could  be  transferred  to the  Company  in  accordance with  the  terms  of the
Partnership Agreements.
 
    The Special Committee indicated that its  proposal on behalf of the  Company
would  require  that (i)  if the  acquisition were  not completed  under certain
circumstances, the  Company  would  receive  a  fee  from  the  Partnerships  (a
"Termination Fee") and reimbursement for all expenses incurred by the Company in
connection  with  the transaction,  and (ii)  if  the Average  Price of  a Share
exceeded or was lower than the limits  of a price range, then the Average  Price
would be fixed at the upper or lower limit of that price range, as appropriate.
 
    On  June  4,  1996,  representatives of  the  Company  and  the Partnerships
commenced  active  negotiation  of  the  terms  of  an  acquisition   agreement.
Thereafter,  the terms of an acquisition agreement were also discussed with IPSC
and its legal counsel since the General Partner intended to seek the consent  of
IPSC to complete a merger. See "The Acquisition Agreement." The most significant
negotiations  concerned the operation  of the price  range and the Partnerships'
payment of the Termination Fee and reimbursement of the Company's expenses under
certain circumstances. During the negotiations, the General Partners advised the
Special Committee  that  IPSC  objected  to  the  Termination  Fee  and  to  any
requirement  that the Partnerships complete the Mergers if the Average Price was
lower than the lower  limit of the  price range. The  IDS1 General Partner  also
advised  the Special Committee that  it would be prohibited  by the terms of the
IDS1 Partnership Agreement  from agreeing  to pay  the Termination  Fee and  the
Company's  expenses.  In  light  of  the  General  Partners'  positions  and the
provisions of the IDS1 Partnership  Agreement, the Special Committee  ultimately
withdrew its request for the Termination
 
                                       39
<PAGE>
Fee,  determining that it was advisable and in the best interests of the Company
and its  stockholders  to  proceed  with the  transaction  on  this  basis.  The
Partnerships  and the  General Partners  agreed to  accept the  price range with
certain modifications that would  allow the General  Partners to withdraw  their
recommendations  of the Mergers  and terminate the  Acquisition Agreement if the
Average Price was more than  $.75 below the lower limit  of the price range  and
the  Company does not elect  to increase the consideration  paid in the Mergers.
IPSC informed  the Company  that it  would  reserve the  right to  withdraw  its
consent  under these  circumstances. The  parties also  agreed that  the Company
would similarly have the right to elect  not to proceed with the Mergers if  the
Average Price exceeded the upper limit of the price range by more than $.75.
 
    On  June  13, 1996,  representatives of  the  General Partners,  IPSC, their
respective counsel and Stanger held a  teleconference to discuss the Offers  and
the  Mergers  and alternatives  thereto and  to  consider the  draft acquisition
agreement, draft appraisals and the draft fairness opinions and the  assumptions
made in preparing the fairness opinions.
 
    On  June  26,  1996,  Stanger delivered  the  Appraisals  and  revised draft
fairness opinions to the General Partners. On June 26, 1996, representatives  of
the  General Partners,  IPSC and  Stanger held  a teleconference  to discuss the
draft acquisition agreement, the Appraisals and revised draft fairness  opinion.
During  that  teleconference, Stanger  indicated its  willingness to  render the
Stanger Fairness Opinion  in the  form presented  to the  General Partners.  The
General  Partners concluded that  the terms of  the Offers and  the Mergers were
fair to Unitholders, approved the execution of the Acquisition Agreement and the
Partnerships' participation in the transaction and formulated the recommendation
set forth in this Proxy  Statement/Prospectus, subject to Stanger's delivery  of
the Stanger Fairness Opinion on July 1, 1996.
 
    On  June 26, 1996  and June 27,  1996, Alex. Brown  presented to the Special
Committee a draft of its opinion that the consideration to be paid in the Offers
and the Mergers is fair to the Company from a financial point of view,  together
with  related materials, and discussed the opinion and related materials and the
analysis performed and the assumptions made  in preparing the opinions with  the
Special  Committee and its legal counsel. Subsequent to that meeting the Special
Committee and its legal counsel  and Alex. Brown met on  June 27, 1996 with  the
other  members of the Company's  Board of Directors in  a meeting to discuss the
transaction and  the draft  of  the Alex.  Brown  fairness opinion  and  related
materials.
 
    On  July 1, 1996, the  Special Committee, its legal  counsel and Alex. Brown
met with the  Board of  Directors to discuss  further the  transaction. At  that
meeting,  Alex. Brown delivered its opinion to the effect that the consideration
to be paid in the Offers and the Mergers is fair to the Company from a financial
point of view, and the Special Committee recommended that the Board of Directors
of the Company approve, and the Board of Directors did approve, the  Acquisition
Agreement  and the consummation by the  Company of the transactions contemplated
by the Acquisition Agreement.
 
    On July  1, 1996,  Stanger delivered  the Stanger  Fairness Opinion  to  the
General Partners.
 
    On  July 1, 1996,  the Company and  the General Partners  on behalf of their
respective Partnerships executed and delivered the Acquisition Agreement.
 
    On July 2, 1996, the Company commenced the Offers.
 
    On September 12, 1996, the Company completed the Offers and purchased 63,234
or 43% of  the outstanding IDS1  Units, 37,164  or 32% of  the outstanding  IDS2
Units, and 50,609 or 42% of the outstanding IDS3 Units.
 
PURPOSES AND STRUCTURE OF THE OFFERS AND THE MERGERS
 
    The  Offers were made and the Mergers have been proposed for approval (i) to
enable the  Company  to  acquire the  entire  equity  interest in  each  of  the
Partnerships  and (ii) to give Unitholders an opportunity to (a) liquidate their
Units for cash in the Offers subject  to the proration provisions of the  Offers
if  greater  than the  maximum  number of  Units  which the  Company  offered to
purchase in the Offers were  validly tendered or (b)  continue to own an  equity
interest in a portfolio of properties,
 
                                       40
<PAGE>
including  their respective Partnership's properties,  through an acquisition of
Shares in the  Mergers. For information  concerning the factors  leading to  the
decision  by  the  Company to  commence  the  Offers and  the  Mergers,  see "--
Background." If the conditions to the consummation of the Mergers are satisfied,
the Company intends  to consummate  the Mergers  and acquire  the entire  equity
interest in the Partnerships that it does not already own.
 
    The  Company's  proposal to  acquire  the Partnerships  commenced  with cash
tender offers for up to a specified number of Units of each Partnership and,  if
applicable  conditions have been satisfied, will be followed by Mergers in which
the outstanding equity interests in the  Partnerships will be exchanged for  the
Merger  Consideration. Pursuant to  the Partnership Agreements,  approval of the
IDS1 Merger requires the affirmative vote by holders of greater than 75% of  the
outstanding  IDS1 Units  and approval  of the  IDS2 Merger  and the  IDS3 Merger
requires the affirmative vote by holders of a majority of the IDS2 Units and the
IDS3 Units,  respectively.  Because  the  Partnership  Agreements  prohibit  the
transfer  of  any  Unit if  the  proposed  transfer would  cause  the applicable
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 in each Offer was set to
prevent a termination of the Partnerships under those circumstances. The parties
viewed a  two-step transaction  (partial cash  tender offers  followed by  stock
mergers)  as being  more desirable  than one-step  cash-election mergers because
completion of the mergers would be subject to a number of conditions  (including
the  approval of Unitholders and  registration of the Shares)  that would not be
conditions to  tender  offers.  See "The  Acquisition  Agreement  --  Conditions
Precedent  to  the  Mergers." Thus,  the  two-step transaction  was  designed to
provide Unitholders with  an opportunity to  obtain liquidity for  a portion  of
their  Units  more  quickly  than  waiting for  completion  of  the  Mergers. In
addition, the  Company favored  a two-step  transaction because  that  structure
might  enable it to  acquire an ownership  position in each  of the Partnerships
more quickly  than through  one-step mergers  and would  enable the  Company  to
acquire Units that it could then vote in favor of a second-step merger.
 
    Pursuant  to the  General Partner  Undertaking and  the Standstill Agreement
contained in the Acquisition  Agreement, the Company has  agreed that, upon  its
admission  as a substituted limited partner  with respect to any Units purchased
in the Offers, it will not, except through the Offers and the Mergers,  directly
or indirectly acquire any additional Units, propose any merger or other business
combination involving any Partnership, or propose any other transaction pursuant
to which it would control any of the assets of any Partnership without the prior
written  consent of a majority of the general partners of the General Partner of
the Partnership. In addition, in the event that any of the Mergers do not  occur
for  any reason,  the Company will  evaluate its  other alternatives, including,
subject to  the General  Partner Undertaking  and the  Standstill Agreement  and
restrictions  imposed by law, purchasing additional Units in the open market, in
privately negotiated  transactions,  in  another tender  or  exchange  offer  or
otherwise,  or  taking  no  further  action  to  acquire  additional  Units. Any
additional purchase of Units could be for cash, stock or a combination  thereof.
Alternatively,  the Company may  sell or otherwise  dispose of any  or all Units
acquired pursuant to the Offers or otherwise. These transactions may be effected
on terms and at prices then determined  by the Company, which may vary from  the
Merger Consideration.
 
    The  Company regards  the acquisition of  the Partnerships  as an attractive
investment opportunity at this time  because it believes that the  Partnerships'
future  business prospects  are favorable.  In addition,  the Mergers  are being
undertaken within  the time  period within  which the  Partnerships expected  to
liquidate their properties. See "-- Background."
 
GENERAL PARTNERS' RECOMMENDATIONS AND REASONS
 
    THE  GENERAL PARTNER OF EACH PARTNERSHIP  RECOMMENDS THAT UNITHOLDERS OF THE
PARTNERSHIP VOTE FOR APPROVAL OF THE ACQUISITION AGREEMENT AND THE  TRANSACTIONS
CONTEMPLATED  THEREBY. This recommendation is  based upon each General Partner's
belief that (i) the terms of the respective Merger, when considered as a  whole,
are  fair  to the  Unitholders of  the respective  Partnership, (ii)  the Merger
Consideration  being  offered  in  exchange  for  the  Units  constitutes   fair
consideration for the interests of the Unitholders and
 
                                       41
<PAGE>
(iii)   after  comparing  certain  potential  benefits  and  detriments  of  the
respective Merger with those of  several alternatives, the respective Merger  is
more  attractive to  the Unitholders  than the  alternatives. These  beliefs are
based upon  each General  Partner's  analysis of  the  terms of  the  respective
Merger, assessment of the respective Merger's potential economic impact upon the
Unitholders,  comparison  of certain  potential benefits  and detriments  of the
respective Merger and several alternatives  to the respective Merger and  review
of the financial condition and performance of the respective Partnership and the
Company and the terms of material agreements by which they are bound.
 
EXPECTED BENEFITS FROM THE MERGERS
 
    In deciding whether to recommend the Mergers as well as in negotiating their
terms,  the General Partners considered the benefits  that would be derived as a
result of  the Mergers.  The following  is  a brief  discussion of  the  primary
benefits for the Unitholders and the General Partners that are expected from the
Mergers:
 
    ASSET   DIVERSIFICATION.     The  Mergers  permit   Unitholders  who  become
stockholders to participate in an investment portfolio substantially larger  and
more  geographically diversified than the portfolio  of any of the Partnerships.
The size and geographic diversity of the Company's portfolio spreads the risk of
an investment in  the Company over  a broader  group of assets  and reduces  the
dependence  of the  investment upon the  performance of any  particular asset or
group of assets, such as assets in the same geographical area.
 
    LIQUIDITY.  No active trading market  exists for the Units, and  Unitholders
may  have difficulty in disposing  of their Units, if they  so desire, or may be
obligated to sell the Units at substantial discounts to facilitate the sales. In
contrast, approval of the Mergers will provide Unitholders with the  opportunity
to  own Common Stock in an entity publicly  traded on the NYSE. For a discussion
of the risks associated with owning Shares, see "Risk Factors."
 
    RETIREMENT PLAN  AND IRA  VALUATIONS.   The  Internal Revenue  Service  (the
"IRS")  has  taken  the  position  that custodians  and  trustees  of  Keogh and
corporate retirement plans must determine, on  an annual basis, the fair  market
value  of the units in the limited partnerships owned by such plans and, in some
cases, must use independent  appraisal or valuation  services to determine  such
values.  The  cost of  these independent  valuations impacts  the return  on the
plan's investment  in  the  limited partnership.  In  addition,  custodians  and
trustees  of IRAs are required to report to the IRS on an annual basis, the fair
market value of the units owned by such IRAs. Approval of the Mergers  generally
will allow custodians and trustees of such plans and IRAs to value the Shares by
reference  to  published price  information  from the  NYSE  without independent
valuation or appraisal.
 
    SIMPLIFIED TAX ADMINISTRATION.   The Mergers will  result in simplified  tax
administration  for many Unitholders. Stockholders will receive Form 1099-DIV to
report their dividends from the  Company. Form 1099-DIV is substantially  easier
to  understand than the more complicated Schedule K-1 prepared for the reporting
of the financial results of the Partnerships.
 
    REDUCED STATE INCOME  TAX REPORTING.   Unitholders  who become  stockholders
will  no longer be subject to the  requirements to file state income tax returns
and/or pay state income taxes in the following states in which the  Partnerships
earn taxable income (assuming the Unitholders are not otherwise required to file
in the states): Arizona, California, Georgia, Michigan, Oregon and Virginia.
 
ALTERNATIVES TO THE MERGERS
 
    The following is a brief discussion of certain benefits and disadvantages of
alternatives to the Mergers that were considered by the General Partners.
 
    LIQUIDATION.   An alternative to the Mergers would be liquidating the assets
of the Partnerships, distributing  the net liquidation  proceeds to the  General
Partners  and  Unitholders in  accordance with  the Partnership  Agreements, and
thereafter dissolving the Partnerships. Through these liquidations, Unitholders'
investment in the Partnerships would be  concluded. All Unitholders would be  at
liberty  to use the net liquidation  proceeds for investment, business, personal
or other purposes.
 
                                       42
<PAGE>
    In recent  years,  operating  results  with  respect  to  the  Partnerships'
properties  have improved, there has been  increased sales activity with respect
to self storage facilities and the capitalization rates at which facilities have
been selling have become more favorable  to sellers resulting in higher  prices.
The General Partners anticipate that net operating income from the Partnerships'
facilities  will continue to improve although at a slower rate than in the past.
If performance  improvements  continue,  the  value of  the  properties  of  the
Partnerships  would be expected to increase,  so long as capitalization rates at
which self storage facilities  are sold do not  increase and sufficient  capital
remains  available  to  finance  acquisitions.  A  complete  liquidation  of the
Partnerships would  deprive those  Unitholders who  do not  desire to  liquidate
their  investment in self storage properties  from participating in the benefits
of  future  performance   and  possible  property   value  improvements.   While
Unitholders could purchase shares of Common Stock in the public market using the
proceeds of liquidation, the number of shares of Common Stock they would be able
to  purchase would be less  than the number of Shares  they would receive in the
Mergers because the Partnerships would incur more expenses in a liquidation that
in the Mergers and  Unitholders would typically  incur brokerage commissions  in
connection  with their purchase of shares of  Common Stock in the public market.
In addition, liquidation of the  Partnerships' properties does not have  certain
of  the other benefits  of the Mergers, including  (i) permitting Unitholders to
hold  their  investment  in  real  estate  until  a  time  when  liquidation  is
appropriate for their individual investment strategy and (ii) the opportunity to
participate  in acquisition and  development opportunities existing  in the real
estate market through equity ownership in the Company.
 
    The transaction  costs  associated  with  the Mergers  are  expected  to  be
significantly  less than those which  would be incurred in  a liquidation of the
Partnerships'  assets,  primarily  because  the  Partnerships  would  incur,  in
addition to certain types of fees incurred in connection with the Offers and the
Mergers  (such as  accounting and  legal fees),  brokerage fees  and real estate
transfer taxes if the properties were liquidated and would likely be responsible
for most if not all 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  Partners  estimate  that the
brokerage fees  would  be  approximately  2%  of  the  appraised  value  of  the
Partnerships' properties (or approximately $800,000, $600,000 and $1 million for
IDS1,  IDS2  and  IDS3,  respectively),  that  the  transfer  taxes  would total
approximately  $160,000,  $180,000  and  $150,000  for  IDS1,  IDS2  and   IDS3,
respectively,  and that the  aggregate costs incurred in  a liquidation would be
approximately $1.7 million,  $1.3 million and  $1.9 million for  IDS1, IDS2  and
IDS3,  respectively.  If  the  Mergers are  consummated,  the  Partnerships will
effectively dispose  of  all  of  their  assets  and  liabilities  in  a  single
transaction,  which will  minimize the liquidation  costs. If the  assets of the
Partnerships were liquidated over time, not only would higher transaction  costs
likely be incurred, but distributions to Unitholders from the Partnerships' cash
flow from operations may be reduced since the Partnerships' fixed costs, such as
general  and administrative expenses, would  not be proportionately reduced with
the liquidation of assets.
 
    The General Partners favor the Mergers over liquidation of the  Partnerships
because  the Mergers will  enable Unitholders to  participate in acquisition and
development opportunities  existing in  the real  estate market  through  equity
ownership  in the Company. Unlike the Partnerships,  which are not in a position
to take  advantage of  external  growth opportunities  since they  have  already
committed  their capital  and are  not authorized  to raise  additional funds or
reinvest net sale or refinancing proceeds  for new investments, the Company  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 Company to
take advantage of investment opportunities  for acquisition or development  that
may  be available. The General Partners  believe that over time Unitholders will
benefit from the Company's growth opportunities even though the cumulative total
return on the  Common Stock  from the  completion of  the Consolidation  through
September  30, 1996 has underperformed the Standard  & Poor's 500 Stock Index by
approximately  18.7%  based  on  the   initial  trading  price  of  the   Common
 
                                       43
<PAGE>
Stock.  In addition, the estimated transaction costs associated with the Mergers
are  significantly  less  than  would  be  incurred  in  a  liquidation  of  the
Partnerships' assets on a single transaction or multiple transaction basis.
 
    CONTINUATION OF THE PARTNERSHIPS.  A second alternative to the Mergers would
be to continue each of the Partnerships as a separate legal entity, with its own
assets  and liabilities. While the disclosure  documents used to offer the Units
for sale to the public disclosed the intentions of the Partnerships to liquidate
their assets within  seven to nine  years after acquisition  or development  for
IDS1  and IDS2 and within five to ten years after acquisition or development for
IDS3, each of the Partnerships has  a stated life of approximately forty  years,
the  Unitholders were  advised that  the liquidation  of the  Partnerships would
depend upon market conditions  as they might  change from time  to time and  the
Partnerships  are  all operating  profitably  and do  not  need to  liquidate to
satisfy debt  obligations or  other current  liabilities or  to avert  defaults,
foreclosures or other adverse business developments.
 
    One  of the significant differences between the Partnerships and the Company
is that the Partnerships are finite life entities and the Company is an infinite
life entity. Continuing the Partnerships 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  Partnerships. In  contrast,  the
Company  does not expect to dispose of  its investments within any specific time
periods and, in  any event, plans  to retain  the net sale  proceeds for  future
investments.   Stockholders  are   expected  to  achieve   liquidity  for  their
investments by  trading  Shares  in  the  public  market  and  not  through  the
liquidation of the Company's assets. The Shares may trade at a discount from, or
premium to, the liquidation value of the Company's properties.
 
    A  number  of  advantages would  be  expected  to arise  from  the continued
operation of the  Partnerships. Unitholders would  probably continue to  receive
regular quarterly distributions of net cash flow arising from operations and the
sale  or refinancing of their Partnership's  assets. The General Partners expect
that net  operating  income  from  the properties  would  continue  to  improve,
although  at a slower rate than in the past because the Partnerships' properties
are essentially fully-leased;  thus, future  increases in  net operating  income
would  come primarily from rent increases and,  to a lesser degree, buildouts of
existing properties  rather than  from  both rent  and occupancy  increases.  In
addition,  the decision to  continue the Partnerships,  if selected, would avoid
whatever disadvantages might be inherent in the Mergers. See "Risk Factors."
 
    The primary disadvantage with continuing the Partnerships is the failure  to
secure  the benefits that the General Partners  expect from the Mergers. See "--
Expected Benefits From the Mergers." In addition, if the Partnerships  continue,
Unitholders  may not have an  opportunity for liquidity in  the near future. The
Partnerships might, however, be sold at another time in another transaction that
could be  on terms  more  or less  favorable  to Unitholders.  Accordingly,  the
General  Partners have concluded that continuation of the Partnerships is not as
attractive as the Mergers.
 
    SUPPORT OF  SECONDARY  MARKET.    Another  alternative  which  would  create
liquidity  for  Unitholders  desiring to  dispose  of their  investments  in the
Partnerships is the creation  or support of the  secondary market for the  Units
through  limited  cash tender  offers or  repurchase  programs sponsored  by the
Partnerships. While the  General Partners  believe that  this alternative  might
provide  liquidity for some Unitholders, the terms of the Partnership Agreements
and federal tax law effectively  prohibit this alternative from being  available
with respect to a majority of the Units. No detailed financial analysis was done
that  would allow the General  Partners to predict with  any degree of certainty
the possible impact of this alternative on the value of the Units.
 
    REORGANIZATIONS OF PARTNERSHIPS  AS SEPARATE  REITS.   The General  Partners
considered  the  advisability  of reorganizing  each  of the  Partnerships  as a
separate corporation taxed as  a REIT, which could  provide Unitholders some  of
the  advantages to be secured by the Mergers, such as providing investors in the
reorganized entities with  some liquidity  through the listing  of their  equity
securities  in a  recognized trading  market and  simplified federal  income tax
reporting. In  addition, the  reorganizations could  be effected  on a  tax-free
basis,  unlike the Mergers, which  will be a taxable  event for Unitholders. The
reorganizations of the Partnerships would, however, result in substantial  costs
and
 
                                       44
<PAGE>
expenses,  and, due to the  size of the Partnerships,  access to capital markets
and the liquidity of the reorganized  entity's securities could be limited.  The
General  Partners have concluded  that the Mergers are  more attractive than the
reorganizations of the Partnerships as separate REITs because the separate REITs
would not provide,  or would  provide on a  more limited  basis, the  advantages
expected  from the Mergers, including the  elimination of potential conflicts of
interest,  simplified  administration,  self-administration,  growth  potential,
asset  diversification and improved access to  capital markets. See "-- Expected
Benefits From the Mergers."
                            FAIRNESS OF THE MERGERS
 
CONCLUSIONS OF THE GENERAL PARTNERS
 
    The General Partners believe that the terms of the Mergers, when  considered
as  a whole,  are fair to  the Unitholders of  each of the  Partnerships and the
Shares offered in  exchange for the  Units of the  Partnerships constitute  fair
consideration  for the interests of the  Unitholders. This section discusses the
factors upon which the General Partners  have based their conclusions as to  the
fairness  of the  Mergers and should  be carefully reviewed  by Unitholders. The
General Partners  did  not find  it  practicable to,  and  did not  attempt  to,
quantify  the relative importance of these factors, but have, where appropriate,
noted which  of the  factors support  or detract  from their  belief as  to  the
fairness of the Mergers to Unitholders.
 
DETERMINATION OF MERGER CONSIDERATION
 
    The  General Partners believe that the  methods used to determine the Merger
Consideration are  fair to  Unitholders.  For each  Partnership, the  number  of
Shares  that would  be received per  Unit in each  of the Mergers  is derived by
dividing (i) the Partnership's  Net Asset Value that  would be allocated to  one
Unit  if the Partnership's Net Asset Value were distributed in accordance with a
Dissolution in accordance with the Partnership Agreement by (ii) the Share Price
(the average of the  per share closing  prices of the Common  Stock on the  NYSE
during  the 20 consecutive trading days ending on the fifth trading day prior to
the Vote Date).
 
    If the Share  Price exceeds  $27.75, then  for purposes  of calculating  the
number  of Shares to be issued  in each of the Mergers,  the Share Price will be
deemed to equal $27.75, and,  if the Share Price is  less than $22.25, then  for
purposes  of  calculating the  number  of Shares  to be  issued  in each  of the
Mergers, the Share  Price will be  deemed to  equal $22.25. If  the Share  Price
exceeds  $28.50,  the  Company  has  the  right  to  terminate  the  Acquisition
Agreement, and if  the Share  Price is  less than  $21.50, each  of the  General
Partners  may withdraw its  recommendation in favor of  the applicable Merger or
terminate the Acquisition Agreement, subject to the Company's option to pay  the
Additional  Consideration. If the  Share Price is between  $27.75 and $28.50 and
all other conditions to the applicable Merger are satisfied, the Merger will  be
consummated  and Unitholders will receive  Shares with a value  in excess of the
Net Asset Value per Unit.  If the Share Price is  between $21.50 and $22.25  and
all  other conditions to the applicable Merger are satisfied, the Merger will be
consummated and Unitholders will receive Shares  with a value that is less  than
the Net Asset Value per Unit.
 
    The  General Partners  believe that the  methods for  determining the Merger
Consideration are fair because  (i) the closing prices  of the Shares have  been
within the Share Price Range for more than a year, (ii) a fluctuation in average
share  prices outside  of the  Share Price  Range will  likely be  due to market
forces not directly  related to  the intrinsic value  of the  Shares, (iii)  the
Share  Price Range provides  reciprocal protection for  each of the Partnerships
and the Company, (iv)  the $.75 difference  between the lower  end of the  Share
Price  Range  and the  Share Price  at which  each of  the General  Partners may
withdraw  its  recommendation  and   terminate  the  Acquisition  Agreement   is
approximately  equal to  the amount the  General Partners estimate  would be the
applicable Partnership's cost to negotiate and present a revised merger proposal
to Unitholders if the  applicable Merger were not  consummated on its  currently
contemplated  terms and (v) under certain circumstances, Unitholders may receive
Shares with a value in  excess of Net Asset  Value per Unit. Unitholders  should
note that although the Stanger Fairness Opinion does not address the fairness of
the  Merger Consideration if  the Share Price  is less than  $22.25, the General
Partners believe the method for determining the Merger Consideration is fair  if
the  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 Share Price is less than $21.50
because each
 
                                       45
<PAGE>
General Partner  may withdraw  its  recommendation in  favor of  the  applicable
Merger  or terminate the Acquisition Agreement if  the Company does not agree to
pay the Additional Consideration. There can  be no assurance, however, that  any
of the General Partners, in discharging its fiduciary duties, would withdraw its
recommendation in favor of the applicable Merger if the Share Price is less than
$21.50.
 
    The  following table sets forth  the calculation of the  Net Asset Values of
the Partnerships.
 
              CALCULATION OF NET ASSET VALUE AS OF MARCH 31, 1996
 
<TABLE>
<CAPTION>
                                                                       IDS1            IDS2            IDS3
                                                                  --------------  --------------  ---------------
<S>                                                               <C>             <C>             <C>
Appraised value of real estate assets...........................  $   40,370,000  $   30,520,000  $    50,890,000
Balance sheet adjustments:
  Cash and cash equivalents.....................................         625,600         367,914          395,166
  Other assets..................................................         342,800         193,561          358,552
  Mortgages, lines of credit and other liabilities..............        (331,900)     (3,589,529)     (11,063,975)
  Estimated transaction costs...................................        (939,800)       (630,100)        (930,100)
                                                                  --------------  --------------  ---------------
Total balance sheet adjustments.................................        (303,300)     (3,658,154)     (11,240,357)
                                                                  --------------  --------------  ---------------
Net Asset Value of Partnership..................................  $   40,066,700  $   26,861,846  $    39,649,643
                                                                  --------------  --------------  ---------------
                                                                  --------------  --------------  ---------------
</TABLE>
 
        ALLOCATION OF NET ASSET VALUE AMONG GENERAL AND LIMITED PARTNERS
 
<TABLE>
<CAPTION>
                                                                       IDS1            IDS2            IDS3
                                                                  --------------  --------------  ---------------
<S>                                                               <C>             <C>             <C>
Net Asset Value allocable to General Partner....................  $    2,003,335  $    1,343,092  $     2,960,762
Net Asset Value allocable to Unitholders........................      38,063,365      25,518,754       36,668,881
Net Asset Value per Unit........................................             257             222              308
</TABLE>
 
FAIRNESS OF THE MERGERS TO THE UNITHOLDERS
 
    REAL ESTATE PORTFOLIO APPRAISALS.  The General Partners have relied in  part
upon  the Appraisals prepared by Stanger, an independent appraiser, to establish
the Appraised  Values of  the Partnerships'  real estate  assets. The  Appraised
Values were utilized in determining the Net Asset Value of each Partnership. See
"Appraisals  and  Opinions of  Financial  Advisors." The  General  Partners have
adopted the Appraisals in  forming their conclusions  regarding the fairness  of
the Mergers to Unitholders.
 
    STANGER FAIRNESS OPINION.  The General Partners have relied in part upon the
Stanger   Fairness  Opinion  to   support  their  conclusion   that  the  Merger
Consideration constitutes fair consideration to  the Unitholders for the  Units.
Subject  to the  assumptions, qualifications  and limitations  set forth  in the
Stanger Fairness Opinion, Stanger concluded that, as of the date of the  Stanger
Fairness  Opinion, the Merger  Consideration was fair to  the Unitholders from a
financial point  of view.  The Stanger  Fairness Opinion  does not  address  the
fairness of any of the terms of the Mergers other than the Merger Consideration.
The  Stanger Fairness Opinion is based  upon business, economic, real estate and
securities markets,  and other  conditions as  of  July 1,  1996, and  does  not
reflect  any changes in those conditions that may have occurred since that date.
See "Appraisals and Opinions of  Financial Advisors." The General Partners  have
adopted  the Stanger Fairness Opinion in forming their conclusions regarding the
fairness of the Mergers to Unitholders.
 
    COMPARISON OF  CERTAIN  BENEFITS  AND  DETRIMENTS  OF  ALTERNATIVES  TO  THE
MERGERS.     Prior  to  concluding  that  the  Mergers  should  be  proposed  to
Unitholders,  the  General  Partners  considered  several  alternatives  to  the
Mergers,   including  liquidation  of  the  Partnerships,  continuation  of  the
Partnerships, support  of  the  secondary  market  and  reorganizations  of  the
Partnerships  as  separate  corporations  taxed as  REITs.  See  "Background and
Reasons for the Mergers  -- Alternatives to the  Mergers." To determine  whether
the  Mergers  or one  of  their alternatives  would  be more  attractive  to the
Unitholders, the  General  Partners  compared  certain  potential  benefits  and
detriments  of the Mergers with certain potential benefits and detriments of the
alternatives. Based  upon  this comparison,  the  General Partners  believe  the
Mergers  are more attractive than the alternatives. See "Reasons for the Mergers
- -- Alternatives to Mergers."
 
                                       46
<PAGE>
    DISTRIBUTIONS  IN ACCORDANCE WITH ORIGINAL INVESTOR UNDERSTANDINGS.  Each of
the Partnership Agreements sets forth  a procedure for allocating  distributions
among  the Unitholders  and the General  Partner. These  distribution rules were
described in detail  in the  disclosure documents delivered  to the  Unitholders
when,  through  the sale  of the  Units,  capital was  originally raised  by the
Partnerships, and constituted the basis upon which Unitholders elected to invest
funds in  the Partnerships.  The  General Partners  have followed  the  original
distribution  rules in determining the Shares  to be received by the Unitholders
and General Partner of each of the Partnerships.
 
    FAIRNESS IN  VIEW  OF CONFLICTS  OF  INTEREST.   The  Company,  the  General
Partners  and  their  affiliates  have  significant  conflicts  of  interest  in
connection with the Mergers, and no unaffiliated representatives were  appointed
to  negotiate the terms of the Mergers on behalf of any of the Partnerships. The
conflicts  of   interest   arise   because,   among   other   factors,   certain
representatives  of  the General  Partners are  also  executive officers  of the
Company. See "Conflicts  of Interest."  The General  Partners believe,  however,
that their recommendation results from a determination that the Mergers are more
attractive to Unitholders than any of the alternatives considered by the General
Partners,  and  that  this  determination  results  from  the  General Partners'
discharge of their  fiduciary duties  to the Unitholders.  The General  Partners
have   based  their  conclusions  regarding  the  fairness  of  the  Mergers  to
Unitholders on the factors discussed in this "Fairness of the Mergers"  section.
The  General Partners believe that  the analyses were performed  in a good faith
exercise of their fiduciary duties, unaffected by these conflicts of interest.
 
    FAIRNESS IN VIEW  OF PS  AGREEMENT.   Pursuant to  the PS  Agreement, PS  is
prohibited  from acquiring (through a tender offer or otherwise) any interest in
the Company or any of the Company's affiliates, including the Partnerships,  for
a period of two years without the Company's consent. See "Background and Reasons
for  the Mergers --  Background." If the  PS Agreement did  not prohibit PS from
acquiring an interest  in the Partnerships,  it is possible  that PS might  have
made   an  offer  to  purchase  the   Units  or  acquire  the  Partnerships  for
consideration greater or lesser than the Merger Consideration, although  neither
the General Partners nor the Company, at the time the PS Agreement was executed,
had  any knowledge of any plan or intention by  PS to make any such offer in the
absence of  the PS  Agreement.  The General  Partners  believe that  the  Merger
Consideration  is  fair to  Unitholders  notwithstanding the  PS  Agreement. The
General Partners  have based  their conclusions  regarding the  fairness of  the
Mergers  to  Unitholders on  their  analyses of  the  factors discussed  in this
"Fairness of  the  Mergers"  section.  The General  Partners  believe  that  the
analyses  were performed in a good faith  exercise of their fiduciary duties and
were not affected by the PS Agreement.
 
    ALLOCATION OF MERGER EXPENSES.  The General Partners believe the  procedures
for  allocating  the  expenses of  the  Mergers  are fair  to  the Partnerships,
inasmuch as each of the Partnerships (i)  will bear its pro rata portion of  the
Shared Expenses based on its relative Net Asset Value if Unitholders approve the
applicable  Merger and (ii) will bear only  a percentage of its pro rata portion
of the Shared Expenses equal to the percentage of Unitholders voting in favor of
the applicable Merger if Unitholders do  not approve that Merger and if  certain
other  events have not  occurred. While the  Acquisition Agreement provides that
the Partnerships, except for  IDS1, will pay  a pro rata  portion of the  Shared
Expenses  and the  Individual Expenses  that would  otherwise be  payable by the
Company if  the Acquisition  Agreement is  terminated for  certain reasons,  the
General Partner believes this is fair because the circumstances under which such
expenses  would be payable by the Partnerships are generally situations in which
the Partnerships  have  entered  into  an  alternative  transaction,  presumably
resulting  in greater value to Unitholders and  prompted at least in part by the
proposed Mergers. See "The Acquisition Agreement -- Fees and Expenses."
 
    IMPACT OF MERGER ON PARTNERSHIP DISTRIBUTIONS.  The Merger Consideration  to
be  received by Unitholders is based primarily upon the Net Asset Value of their
respective Partnership. Recognizing that there may be changes in a Partnership's
values between March 31, 1996 (the date on which the Net Asset Values are based)
and the Partnership's Closing Date  and that it is  a condition to that  Closing
that  the respective Partnership's Closing  Net Asset Value is  no less than its
Net Asset  Value,  the  General  Partner  of  the  Partnership  may  delay  cash
distributions if it deems appropriate. As soon
 
                                       47
<PAGE>
as  practicable following the  Closing for a  particular Partnership, pre-Merger
Unitholders and the  General Partner  of that  Partnership will  receive a  cash
distribution  in an aggregate amount  equal to the amount,  if any, by which the
Partnership's Closing  Net  Asset  Value  exceeds its  Net  Asset  Value.  If  a
Partnership   does  not  participate  in  the  Mergers,  the  Mergers  may  only
temporarily delay, but are  not otherwise expected to  affect or reduce  (except
for  the Partnership's portion of Merger expenses), the total distributions made
by the Partnership. The General Partners do not consider this delay or reduction
in distributions due  to payment  of Merger  expenses to  affect materially  the
fairness of the Mergers with respect to Unitholders.
 
    WASHINGTON STATUTORY DISSENTERS' RIGHTS.  Unitholders who are opposed to the
Mergers  will be entitled to statutory dissenters' rights under the WULPA. Under
the WULPA, Unitholders  opposing the  Mergers may  contest the  fairness of  the
value of the Merger Consideration, request that any unresolved dispute regarding
the  value  of the  assets be  determined by  an appraiser  or appraisers  to be
selected by a  Washington Superior  Court and  require that  their interests  be
purchased  for an all  cash payment. Dissenting  Unitholders would not, however,
have the right to  prevent their Partnership's participation  in the Mergers  if
their  Partnership's Merger is approved by  the requisite vote of the applicable
Unitholders. See "Dissenters' Rights of Unitholders."
 
COMPARISON OF MERGER CONSIDERATION TO ALTERNATIVES
 
    GENERAL.   To assist  Unitholders  in evaluating  the Mergers,  the  General
Partner  of each Partnership  has attempted to  compare the Merger Consideration
with (i) estimates of  the value of  the Units on  a liquidation basis  assuming
that  the Partnership's assets were sold at  their fair market value (based upon
the Appraisals)  or net  book value  and  the net  proceeds distributed  to  the
General  Partner and Unitholders  in accordance with  the applicable Partnership
Agreement and (ii) estimates of the value of the Units on a going concern  basis
assuming  that the Partnership continued as an operating business and its assets
were sold at  the end  of 2000.  Due to  the uncertainty  in establishing  these
values, the General Partner has, in instances it deemed appropriate, established
a  range of estimated values  for each alternative, representing  a high and low
estimated value for the  potential consideration. Each  of the General  Partners
believe  that analyzing the alternatives in  terms of ranges of estimated value,
established based upon currently available  market data and, where  appropriate,
reasonable  assumptions made in  good faith, establishes  a reasonable framework
for comparing  alternatives.  The  results  of  this  comparative  analysis  are
summarized in the table below. For information regarding secondary market prices
as  reported to Stanger by certain secondary  market firms involved in the sales
of Units, see  "Distributions and  Market Prices of  Units --  Market Prices  of
Units."
 
    The  estimated values are  based upon information  available to each General
Partner at  the  time  they  were  computed,  including  historical  information
regarding  the applicable Partnership and current real estate markets, and there
can be no assurance  that the same  conditions analyzed by  each of the  General
Partners in arriving at the estimates would exist at the time of consummation of
the  Mergers. In  addition, the  estimated values  assigned to  the alternatives
below are based on a variety of assumptions that have been made by each  General
Partner  that  relate, among  other things,  to (i)  the Share  Price as  of the
Closing Date for the applicable 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,  changes  in
capitalization  rates used by prospective purchasers, tax law changes, increased
supply  of  or  decreased  demand   for  self  storage  facilities  leading   to
 
                                       48
<PAGE>
lower  occupancy rates or lower rental rates, the manner in which the properties
are sold and the related selling costs 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
                                                                               ESTIMATED GOING     VALUE PER UNIT ASSUMING
                                                                                                   PARTNERSHIP ASSETS SOLD
                                                                              CONCERN VALUE PER              AT:
                                                               MERGER              UNIT (2)        ------------------------
                                                            CONSIDERATION    --------------------   APPRAISED    NET BOOK
PARTNERSHIP                                                 PER UNIT (1)       HIGH        LOW      VALUE (3)    VALUE (4)
- --------------------------------------------------------  -----------------  ---------  ---------  -----------  -----------
<S>                                                       <C>                <C>        <C>        <C>          <C>
IDS1....................................................      $     257      $     251  $     235   $     253    $     175
IDS2....................................................            222            218        203         217          183
IDS3....................................................            308            304        283         299          192
</TABLE>
 
- ------------------------
(1)  Assumes  the  Share Price  is  within  the Share  Price  Range.  The Merger
    Consideration is payable in  Shares and cash in  lieu of fractional  Shares.
    See "-- Determination of Merger Consideration."
 
(2)  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 "-- Comparison of Merger Consideration to Alternatives -- Going
    Concern Values." The per Unit going concern value estimates were  calculated
    based  upon the  applicable General Partner's  aggregate high  and low going
    concern  value  estimates  allocable  to  Unitholders  of  $37,128,461   and
    $34,777,892  for IDS1, $25,126,033 and  $23,285,941 for IDS2 and $36,242,674
    and $33,749,516 for IDS3.
 
(3) Estimated Liquidation Value at Appraised  Value is based primarily upon  the
    Appraisals  and adjustments for  non-real estate assets  and liabilities and
    estimated selling  costs.  See "--  Comparison  of Merger  Consideration  to
    Alternatives  --  Liquidation Values."  The  per Unit  liquidation  value at
    Appraised Value estimates were calculated based upon the applicable  General
    Partner's  aggregate  liquidation  value  at  Appraised  Value  estimate for
    Unitholders of $37,422,115, $24,957,589 and  $35,638,656 for IDS1, IDS2  and
    IDS3, respectively.
 
(4)  Estimated Liquidation Value at  Net Book Value is  computed as of March 31,
    1996  less  estimated   selling  costs.   See  "--   Comparison  of   Merger
    Consideration to Alternatives -- Liquidation Values." The aggregate net book
    values  of $25,930,707, $21,011,081 and $22,851,497 for IDS1, IDS2 and IDS3,
    respectively, each  represent  the  value of  the  applicable  Partnership's
    equity  as of  March 31, 1996  allocable to Unitholders  of that Partnership
    computed in accordance with GAAP, less selling costs equal to 4% of the book
    value of that Partnership's real estate assets.
 
    GOING CONCERN VALUES.  The General Partners have estimated the going concern
value of each of the Partnerships by analyzing each Partnership's projected cash
distributions, assuming that the Partnership was operated as an ongoing business
through the  end  of  2000 and  its  assets  sold  at that  time  based  upon  a
capitalization  of projected property cash flows  in 2001. Each Unitholder would
be entitled to receive a pro rata share of the quarterly distributions from  his
or   her  Partnership's  cash   available  for  distribution   and  the  special
distribution of  the  liquidation  proceeds, net  of  existing  liabilities,  in
accordance with the Partnership Agreements. This analysis is consistent with the
expectation that each of the Partnerships would be a finite-life investment. The
assumption  of property dispositions in 2000  is consistent with the anticipated
disposition timeframes for IDS2 and IDS3 and one year later than the anticipated
disposition timeframe for IDS1.
 
    The General Partners have presented two estimates of the going concern value
of each of the Partnerships  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  Appraisals,  adjusted for  general and  administrative expenses  (which are
assumed to  increase  at  a rate  of  3.5%  per year),  debt  service  (interest
payments)  and principal amortization payments, where applicable, and to reflect
the allocation of the Partnership's  value among Unitholders and the  applicable
General  Partner in  accordance with  the applicable  Partnership Agreement. The
going   concern    value    of    each   Partnership    was    established    by
 
                                       49
<PAGE>
computing  the present value of the  projected distributions with respect to the
applicable Partnership's Units, discounted  at a rate of  13%, 13.25% and  13.5%
per annum for IDS1, IDS2 and IDS3, respectively, under the conservative scenario
and  at a  rate of  12%, 12.25%  and 12.5%  per annum  for IDS1,  IDS2 and IDS3,
respectively, under the  more favorable  scenario. In  determining the  discount
rates  deemed appropriate for  the going concern  analyses, the General Partners
considered, among other factors, the rates of return generally required by  real
estate  investors  and the  discount rates  utilized in  the Appraisals  and, as
applicable, the amount  and maturities  of debt encumbering  the properties  and
refinancing risks related thereto. In determining the going concern value of the
Partnerships,  the  General Partners  assumed  that each  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  $933,428 for IDS2,
including a balloon payment due in 1997 of $470,000, and adjusted for  principal
amortization of $2,150,421 for IDS3, including balloon payments due in 1996 (net
of  amounts refinanced) of approximately $1,000,000),  resulting in an excess of
non-real estate assets over non-real estate liabilities of $444,317 for IDS1 and
an excess  of  non-real  estate  liabilities  over  non-real  estate  assets  of
$2,182,284   and  $8,147,988  for   IDS2  and  IDS3,   respectively.  Under  the
conservative scenario, each Partnership's assets are sold at the end of 2000 for
an all-cash purchase price of $43,333,333, $32,933,333 and $55,219,048 for IDS1,
IDS2 and IDS3,  respectively, which  is sufficient to  yield the  buyer a  10.5%
return  based on the applicable Partnership's  projected property cash flows for
2001 of approximately $4,550,000, $3,458,000  and $5,798,000 for IDS1, IDS2  and
IDS3,  respectively. Under the  more favorable scenario, it  is assumed that the
Partnership's assets are sold at the end of 2000 for an all-cash purchase  price
of   $45,500,000,  $34,580,000  and   $57,980,000  for  IDS1,   IDS2  and  IDS3,
respectively, which is sufficient to yield the buyer a 10% return based upon the
applicable Partnership's projected property cash flows in 2001. In addition,  it
was  assumed  that  the excess  land  held  by IDS3  is  sold  for approximately
$446,000.
 
    The going concern analysis assumes  all of the Partnerships' properties  are
sold  in a single transaction at the end  of 2000 with selling expenses equal to
4% of then current  real estate value. If,  instead, the assets were  liquidated
over  time,  even  at prices  equal  to  those projected,  distributions  to the
Unitholders out of the Partnerships' cash flow from operations might be  reduced
because   the  Partnerships'  relatively  fixed   costs,  such  as  general  and
administrative  expenses,  would  not   be  proportionately  reduced  with   the
liquidation  of assets. Accordingly, the General Partners believe the assumption
that all the properties  are sold in  a single transaction  results in the  most
favorable valuation for Unitholders.
 
    Set  forth  below  are  tables  showing  the  calculation  of  each  of  the
Partnership's cash flows used  to calculate the going  concern value based  upon
the assumptions described above.
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. (1)
 
<TABLE>
<CAPTION>
                                                                                 GENERAL AND
                                                                 PROPERTY CASH  ADMINISTRATIVE UNITHOLDERS' SHARE
YEAR                                                                 FLOW         EXPENSES      OF NET CASH FLOW
- ---------------------------------------------------------------  -------------  -------------  -------------------
<S>                                                              <C>            <C>            <C>
1996...........................................................   $ 3,962,000    $  (210,100)     $   3,564,305
1997...........................................................     4,036,000       (217,454)         3,627,619
1998...........................................................     4,159,000       (225,064)         3,737,239
1999...........................................................     4,285,000       (232,942)         3,849,455
2000...........................................................     4,416,000       (241,095)         3,966,160
                                                                 -------------  -------------  -------------------
  Total........................................................   $20,858,000    $(1,126,654)     $  18,744,779
                                                                 -------------  -------------  -------------------
                                                                 -------------  -------------  -------------------
</TABLE>
 
- ------------------------
 
(1)  IDS1 does not have any indebtedness;  thus, no adjustments for debt service
    and principal amortization are necessary.
 
                                       50
<PAGE>
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 
<TABLE>
<CAPTION>
                                                           GENERAL AND                               UNITHOLDERS'
                                           PROPERTY CASH  ADMINISTRATIVE                PRINCIPAL    SHARE OF NET
YEAR                                           FLOW         EXPENSES     DEBT SERVICE  AMORTIZATION    CASH FLOW
- -----------------------------------------  -------------  -------------  ------------  ------------  -------------
<S>                                        <C>            <C>            <C>           <C>           <C>
1996.....................................  $   2,923,000   $  (159,200)  $   (274,700)  $  (78,207)  $   2,290,348
1997.....................................      3,051,000      (164,772)      (239,851)    (554,856)      1,986,945
1998.....................................      3,146,000      (170,539)      (218,645)     (92,071)      2,531,508
1999.....................................      3,259,000      (176,508)      (210,817)     (99,899)      2,633,187
2000.....................................      3,358,000      (182,686)      (202,321)    (108,395)      2,721,369
                                           -------------  -------------  ------------  ------------  -------------
  Total..................................  $  15,737,000   $  (853,705)  $ (1,146,334)  $ (933,428)  $  12,163,357
                                           -------------  -------------  ------------  ------------  -------------
                                           -------------  -------------  ------------  ------------  -------------
</TABLE>
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
<TABLE>
<CAPTION>
                                              GENERAL AND                                            UNITHOLDERS'
                              PROPERTY CASH  ADMINISTRATIVE               BUILDOUT IN   PRINCIPAL    SHARE OF NET
YEAR                              FLOW         EXPENSES     DEBT SERVICE   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 Partnerships do not as a matter of course make forecasts or  projections
as to future performance or earnings. However, in performing their going concern
analyses,  the General Partners  prepared the above  projections relating to the
Partnerships' 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 PROXY  STATEMENT/PROSPECTUS 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  Partnerships' control,  there can  be  no
assurance that the projections will be realized. Actual results may be higher or
lower than those set forth above.
 
    LIQUIDATION  VALUES.  Since one of the alternatives available to the General
Partners is  to  proceed  with  a  liquidation  of  the  Partnerships,  and  the
corresponding  distribution  of  the  net liquidation  proceeds  to  the General
Partners and Unitholders,  the General Partners  have estimated the  liquidation
value  of the Units  (i) assuming that the  Partnerships' real estate portfolios
were sold  at  their  Appraised  Values and  that  non-real  estate  assets  and
liabilities were sold at their book value except for amortizable assets and (ii)
assuming that all of the Partnerships' assets and liabilities were sold at their
net  book value.  Both alternatives assume  that the  Partnerships incur selling
costs of 4% of the  real estate assets' value  and the net liquidation  proceeds
are  distributed among the  General Partners and  Unitholders in accordance with
the applicable Partnership Agreement.
 
    The liquidation analysis assumes that  each of the Partnerships'  portfolios
is  sold in a single  transaction at its Appraised Value  or net book value. If,
instead, the assets  were liquidated over  time, even at  prices equal to  those
projected,  distributions to the Unitholders out  of the Partnerships' cash flow
from operations  might be  reduced because  the Partnerships'  relatively  fixed
costs, such as general and administrative expenses, would not be proportionately
reduced  with  the  liquidation  of assets.  Accordingly,  the  General Partners
believe the  assumption  that  all  of  the properties  are  sold  in  a  single
transaction results in the most favorable valuation for Unitholders.
 
    Of  the two columns provided for liquidation  values in the above table, the
General Partners  believe that  the  liquidations at  Appraised Value  are  more
reflective  of the amounts that would actually be distributed to the Unitholders
if  the  Partnerships  were  to  proceed  with  liquidating  their  assets.  See
 
                                       51
<PAGE>
"Appraisals  and Opinions of  Financial Advisors --  Portfolio Appraisals of the
Partnerships' Properties." The  Appraisals set forth,  subject to the  specified
assumptions,  limitations and qualifications,  Stanger's professional opinion as
to the market value of the Partnerships' real estate portfolios. While the price
at which the assets  would sell if actually  liquidated could differ  materially
from the Appraised Values, the Appraisals are intended to estimate the prices at
which  the  real estate  assets would  sell  if disposed  of in  an arm's-length
transaction between a willing buyer and a willing seller, each having access  to
relevant  information  regarding the  historical  revenues and  expenses  of the
properties. The Appraisals assume that the Partnerships' assets are disposed  of
in  an  orderly manner  and are  not sold  in forced  or distressed  sales where
sellers might be expected to dispose of their interests at substantial discounts
to their actual fair market value.
 
    In contrast, the net  book value represents the  value of the  Partnerships'
equity  as of  March 31,  1996, computed in  accordance with  GAAP, less selling
costs equal to 4% of the book value of the Partnerships' real estate assets. The
net book value computations are not  adjusted for, or intended to be,  estimates
of  the fair  market value  of the real  estate assets.  Nonetheless, since book
value is a commonly used accounting principle, and shows the values at which the
assets are carried  on the Partnerships'  books, it does  establish a basis  for
comparing the value of the Units to other commonly used measures of value.
 
DISTRIBUTION COMPARISON
 
    The  General Partners  have considered the  potential impact  of the Mergers
upon distributions  that would  be made  to Unitholders  becoming  stockholders.
Depending  upon the  Share Price used  to determine  the number of  Shares to be
issued in  the  Mergers,  after  the  Mergers  the  level  of  distributions  to
Unitholders who have become Company stockholders may be higher or lower than the
level  of distributions with  respect to their  Units prior to  the Mergers. The
General  Partners  believe  that  such   changes  in  distribution  levels   are
justifiable  when taking into  account differences in  the Partnerships' and the
Company's cash distribution  policies, principal and  interest payments on  debt
and   capital  expenditure  levels.   The  table  below   shows  the  pro  forma
distributions that  would  have been  made  to  Unitholders as  if  they  became
stockholders  on  January 1,  1996, using  the actual  distribution paid  by the
Company in the quarter  ended June 30,  1996 ($.47 per  share of Common  Stock),
assuming  the Mergers  occurred on  January 1, 1996  and rounding  the number of
Shares to be received to the nearest  whole Share. The table compares these  pro
forma  estimates against  the actual  distributions to  Unitholders paid  in the
second quarter of 1996 (not upon the amounts that might have been distributed by
the Partnerships based upon their cash balances).
 
<TABLE>
<CAPTION>
                                             QUARTER ENDED
                                             JUNE 30, 1996
                                             DISTRIBUTION
                                             -------------
                                                                    PRO FORMA                   PRO FORMA
                                                                  JUNE 30, 1996               JUNE 30, 1996
                                                                 DISTRIBUTION AT             DISTRIBUTION AT
                                                                $22.25 SHARE PRICE         $27.75 SHARE PRICE
                                                            --------------------------  -------------------------
PARTNERSHIP                                                     $         % CHANGE          $         % CHANGE
- -------------------------------------------                 ---------  ---------------  ---------  --------------
<S>                                          <C>            <C>        <C>              <C>        <C>
IDS1.......................................    $    4.84    $    5.64           17%     $    4.23         (13)%
IDS2.......................................         4.06         4.70           16           3.76          (7)
IDS3.......................................         4.69         6.58           40           5.17          10
</TABLE>
 
    When reviewing  this data,  Unitholders  should consider  that a  number  of
factors affect the level of the Partnerships' quarterly distributions, including
the   distributable  income  generated  by  the  Partnerships'  operations,  the
principal and interest payments on  the Partnerships' debt, capital  expenditure
levels  (in excess of  normal expenditures for  ongoing maintenance and repairs)
and the Partnerships' policy  with respect to  quarterly cash distributions.  In
some  cases,  the Partnerships  have, in  order to  maintain constant  levels of
distributions, made quarterly distributions in  excess of cash generated by  the
Partnerships' operations during the preceding quarter. The Partnerships' ability
to  make such  an excess  distribution would also  be affected  by existing cash
reserves and the ability to borrow funds necessary to make the distribution.  In
addition,  the portion of total assets and debt represented by income generating
real estate  versus  cash  and  non-cash generating  assets  differs  among  the
Partnerships. Such differences impact to some degree the amount of distributable
cash
 
                                       52
<PAGE>
generated  relative  to  the  Net  Asset Values  of  the  Partnerships.  For the
foregoing reasons, a  comparison of  pro forma  and actual  distributions for  a
single period does not clearly show how the Mergers might affect a Partnership's
distribution levels when analyzed over a number of years.
 
CONCLUSIONS OF THE SPECIAL COMMITTEE
 
    The  Special Committee of the Board of Directors of the Company has reviewed
the terms  of the  Mergers and  believes that  each of  the Mergers  is fair  to
Unitholders.  In determining the fairness of the Mergers to the Unitholders, the
Special Committee considered a number  of factors, including the following,  and
did not assign relative weights to them in reaching its conclusion.
 
    RECOMMENDATION  OF THE GENERAL  PARTNERS.  The  Special Committee considered
the conclusions of the General Partners as to fairness and adopted the  analysis
underlying  those conclusions for  purposes of reaching  its own conclusion that
the Mergers  are  fair  to  Unitholders. See  "--  Conclusions  of  the  General
Partners," "-- Fairness of the Mergers to the Unitholders" and "-- Comparison of
Merger  Consideration to  Alternatives." The  General Partners  have significant
conflicts of  interest in  connection with  the Mergers,  which conflicts  arise
because, among other factors, certain representatives of the General Partner are
also officers of the Company. See "Conflicts of Interest."
 
    CONSENT  OF IPSC.   The Special Committee  considered the fact  that IPSC, a
limited partner of each of the General Partners which is not affiliated with the
Company, consented to the Mergers. The Special Committee noted that pursuant  to
the GP Agreements the consent of IPSC may be required to consummate the Mergers.
 
    APPRAISALS.   The Special  Committee considered the  Appraisals delivered to
the General Partners by Stanger and the  fact that the Net Asset Value is  based
in  large part  on the  Appraisals. Copies  of the  Appraisals, which  set forth
discussions of the specific assumptions,  limitations and qualifications of  the
analysis    undertaken,   are   attached   as   Appendix   B   to   this   Proxy
Statement/Prospectus and should be  read in their  entirety by each  Unitholder.
See  "Appraisals and Opinions  of Financial Advisors  -- Portfolio Appraisals of
the Partnerships' Properties."
 
    FAIRNESS OPINION.   The Special  Committee considered  the Stanger  Fairness
Opinion   delivered  to  the   General  Partner  by   Stanger  that  the  Merger
Consideration is fair to  the Unitholders of each  Partnership from a  financial
point  of view.  A copy of  the Stanger  Fairness Opinion, which  sets forth the
assumptions made, matters considered and  limitations of the review  undertaken,
is  attached as Appendix C to this Proxy Statement/Prospectus and should be read
in its entirety by  each Unitholder. See "Appraisals  and Opinions of  Financial
Advisors -- Opinions of the Partnerships' Financial Advisor."
 
                           THE ACQUISITION AGREEMENT
 
    The  following  is  a  summary  of  certain  provisions  of  the Acquisition
Agreement,  a  copy  of  which  is   attached  as  Appendix  A  to  this   Proxy
Statement/Prospectus  and is incorporated herein by reference. This summary does
not purport to be complete and is qualified in its entirety by reference to  the
full text of the Acquisition Agreement.
 
THE MERGERS
 
    Subject  to the  terms and conditions  of the Acquisition  Agreement, at the
effective time of  the Mergers  (the "Effective  Time") each  Partnership as  to
which  the  conditions  to  closing  have  been  satisfied  or  waived  (each, a
"Participating Partnership") will be  merged with and into  the Company. At  the
Effective  Time, the separate  existence of the  Participating Partnerships will
cease, and the Company will continue as the surviving entity of the Mergers.
 
    At the Effective Time, each Unit (other than Units owned by the Company  and
Units owned by Unitholders exercising dissenters' rights) and the GP Interest of
each  of  the Participating  Partnerships will  be converted  into the  right to
receive (i) that number of Shares calculated by dividing (a) the Net Asset Value
of the applicable  Partnership that would  be allocated  to one Unit  or the  GP
Interest,  as  the  case  may  be, if  the  Partnership's  Net  Asset  Value was
distributed in a Dissolution by (b) the Share Price
 
                                       53
<PAGE>
and (ii) the  amount of the  Additional Consideration, if  any is payable,  that
would  be allocated to one Unit  or the GP Interest, as  the case may be, if the
Additional Consideration was  distributed in  a Dissolution, and  (iii) cash  in
lieu  of a fractional  Share. All Units  owned by the  Company will be cancelled
upon consummation of the Merger.
 
    In the event the  Share Price exceeds $28.50  for a particular  Partnership,
the  Company has  the right  to terminate the  Acquisition Agreement  as to that
Partnership. In the event the Share Price  is less than $21.50 for a  particular
Partnership,   the  General  Partner  of   that  Partnership  may  withdraw  its
recommendation in favor of  the applicable Merger  or terminate the  Acquisition
Agreement;  provided, however, that  prior to withdrawing  its recommendation or
terminating the  Acquisition  Agreement  as to  that  Partnership,  the  General
Partner, if so requested by the Company, must adjourn the Special Meeting of the
applicable  Partnership for up to ten business  days and the General Partner may
not withdraw its recommendation if, at least two business days prior to the date
of the  adjourned Special  Meeting, the  Company agrees  to pay  the  Additional
Consideration.  Additional Consideration,  with respect to  each Partnership, is
that amount of cash equal to the  difference between the actual Share Price  and
$21.50,  multiplied  by the  number of  Shares  to be  issued in  the applicable
Merger.
 
    The Acquisition Agreement  provides that  in the  event the  payment of  the
Merger  Consideration pursuant to the Acquisition  Agreement would result in the
issuance by the Company  of more than  20% of the  outstanding shares of  Common
Stock,  the Company may elect to  pay cash in lieu of  shares of Common Stock in
excess of such amount. The Company currently does not expect that the number  of
Shares  issued  pursuant to  the Acquisition  Agreement will  exceed 20%  of the
outstanding shares of Common Stock.
 
REPRESENTATIONS AND WARRANTIES
 
    In the Acquisition Agreement, the  Company has made various  representations
and  warranties to  each Partnership,  including representations  and warranties
relating to (i) the due organization of  the Company and its authority to  enter
into  the  Acquisition  Agreement,  (ii)  the absence  of  the  need  (except as
specified) for third-party or  governmental consents to  the Mergers, (iii)  the
Mergers'  nonviolation  of  laws  and material  agreements,  (iv)  the Company's
capitalization, (v) the  due authorization  of the Shares  to be  issued in  the
Mergers,  (vi)  the  accuracy  of  publicly  filed  documents,  (vii)  financial
statements, (viii) full disclosure and (ix) the absence of material litigation.
 
    In  addition,  each  Partnership   has  made  various  representations   and
warranties   to  the  Company,  including  (i)   the  due  organization  of  the
Partnership, (ii) its authority to  enter into the Acquisition Agreement,  (iii)
the  absence of the  need (except as specified)  for third-party or governmental
consents to  its Merger  and  its Merger's  nonviolation  of laws  and  material
agreements,  (iv)  the  accuracy  of  publicly  filed  documents,  (v) financial
statements, (vi)  full disclosure,  (vii) the  absence of  defaults of  material
agreements,  (viii) the absence of material litigation, (ix) title to assets and
properties and  the absence  of  environmental liabilities  and (x)  payment  of
taxes.
 
CONDUCT OF BUSINESS PENDING THE EFFECTIVE TIME
 
    Each Partnership has agreed that, prior to the Effective Time or the earlier
termination  of the Acquisition Agreement, it will  carry on its business in the
ordinary course in  substantially the  same manner as  previously conducted  and
will  use  its  reasonable  efforts  to  preserve  intact  its  present business
organization and  goodwill, maintain  permits, licenses  and authorizations  and
preserve  its relationship with third parties. In addition, each Partnership has
agreed to  use its  best efforts  to  manage its  business, including,  but  not
limited to, suspending cash distributions to its partners if the General Partner
deems  it advisable to do so, so  that the Partnership's Closing Net Asset Value
will not be  less than  the Partnership's  Net Asset  Value. To  the extent  the
Partnership's  Closing  Net Asset  Value  exceeds its  Net  Asset Value,  a cash
distribution in the  amount of  such excess will  be made  to the  Partnership's
pre-Merger  Unitholders and General Partner in  accordance with the terms of the
applicable Partnership Agreement as soon as practicable following the Closing.
 
                                       54
<PAGE>
IPSC CONSENT
 
    Pursuant to the GP Agreements, the general partners of the General  Partners
may  not have authority  to approve the  Mergers without the  consent of IPSC, a
limited partner of each of the General Partners which is not affiliated with the
Company. IPSC reviewed  a draft of  the registration statement  relating to  the
Mergers,  including the preliminary  Proxy Statement/Prospectus, the Acquisition
Agreement, the draft Appraisals  and the form of  the Stanger Fairness  Opinion,
and  retained independent legal counsel. IPSC  did not conduct any due diligence
review of the information contained  in this Proxy Statement/Prospectus and  has
not  participated in the management or control of the Partnerships. Based on its
review of documents, the General Partners' review of alternatives to the  Offers
and the Mergers and the Stanger Fairness Opinion, IPSC consented to the Mergers.
IPSC  has  significant conflicts  of  interest in  the  Mergers because,  if the
Mergers are consummated, IPSC would receive  (based upon an assumed Share  Price
of  $25.00) approximately 32,050,  21,500 and 52,600 Shares  with respect to its
limited partnership  interests in  the IDS1  General Partner,  the IDS2  General
Partner and the IDS3 General Partner, respectively. See "Conflicts of Interest."
 
STANDSTILL AGREEMENT
 
    The  Company has  agreed that,  upon its  admission as  a substitute limited
partner with respect  to the  Units it  purchased in  the Offers,  it will  not,
directly  or indirectly, without the prior written  consent of a majority of the
general partners  of  the General  Partner  of the  applicable  Partnership  (i)
acquire  any additional  Units of  the Partnership,  (ii) propose  any merger or
other business combination involving the Partnership or (iii) propose any  other
transaction  pursuant to which it would control  or acquire any of the assets of
the Partnership.
 
NO SOLICITATION OF TRANSACTIONS
 
    Until the termination of the Acquisition Agreement, no Partnership will, nor
will it permit  its partners (including  any general or  limited partner of  its
General   Partner),   agents  or   other  representatives   (including,  without
limitation, any investment banker,  attorney or accountant  retained by it)  to,
directly  or indirectly, initiate, solicit or  encourage, or, except as required
by law, including  fiduciary duties required  by law, engage  in discussions  or
negotiations  with or provide any information to any entity or group (other than
the Company or an affiliate of the Company) concerning any acquisition proposal,
tender offer,  exchange  offer, merger,  consolidation,  sale of  a  substantial
amount  of assets, or sale  of securities or equity  interests, or in connection
with  a  liquidation,   dissolution  or  similar   transaction  involving   such
Partnership. Subject to fiduciary duty requirements of the General Partners, the
Partnerships have agreed to notify the Company immediately if any such inquiries
or  proposals are received  by, any such  information is requested  from, or any
such negotiations or discussions are sought  to be initiated or continued  with,
the Partnerships, and have agreed to keep the Company informed of the status and
terms of any such proposals and any such negotiations or discussions.
 
INDEMNIFICATION
 
    From  and  after the  Effective Time,  the Company  will indemnify  and hold
harmless the General Partner of each  of the Participating Partnerships and  its
general  and limited partners  to the same  extent that such  persons would have
been entitled  to  indemnification  by the  Partnership  under  its  Partnership
Agreement.
 
CONDITIONS PRECEDENT TO THE MERGERS
 
    The  consummation of a Merger as to  any Partnership is not conditioned upon
the consummation of a Merger as to any other Partnership. In the event that  the
conditions  to Closing have been satisfied or  waived with respect to one or two
Partnerships, the Mergers may be effected with respect to such Partnerships, and
in the event the conditions to Closing subsequently are satisfied or waived with
respect to any additional Partnerships, the  Mergers may be effected as to  such
Partnerships.
 
    CONDITIONS  TO EACH PARTY'S OBLIGATIONS.  The respective obligations of each
party to effect  the Mergers are  subject to  the fulfillment on  or before  the
Closing  Date of the  following conditions: (i)  the Acquisition Agreement shall
have been approved by the requisite vote of the Unitholders of the Partnerships;
(ii) no injunctions relating to the Mergers  or any of the parties thereto  that
would have a
 
                                       55
<PAGE>
material  adverse effect on the Company or  on the business or properties of the
Partnerships,  taken  as  a  whole  or  individually,  or  that  would   prevent
consummation  of the Mergers, will have been issued or remain outstanding; (iii)
the Registration Statement will have  been declared effective by the  Commission
under  the Securities Act and no stop  order suspending the effectiveness of the
Registration Statement shall  have been issued;  and (iv) the  Shares will  have
been authorized for listing on the NYSE upon official notice of issuance.
 
    CONDITIONS  TO THE OBLIGATIONS OF THE COMPANY.  In addition to the foregoing
conditions, the  obligation of  the Company  to effect  the Mergers  as to  each
Partnership  is further subject to fulfillment or waiver before the Closing Date
of the following conditions:  (i) receipt of a  fairness opinion to the  Company
from  Alex. Brown as to  the fairness to the Company,  from a financial point of
view, of  the Merger  Consideration;  (ii) receipt  of  a certificate  from  the
General  Partner as of  the Closing Date  certifying that the  Closing Net Asset
Value of  each  Partnership  is  not  less than  the  Net  Asset  Value  of  the
Partnership;  (iii)  there will  have  been no  material  adverse change  in the
Partnership's ability  to  consummate  the  Mergers,  or  in  the  Partnership's
business,  operations, properties, assets or  condition, financial or otherwise,
since the  date  of the  Acquisition  Agreement; (iv)  the  representations  and
warranties  of the Partnership will  be true in all  material respects as of the
Closing Date; (v) all necessary consents and approvals from third parties  shall
have  been obtained; and  (vi) the Company  shall have received  an opinion from
counsel to the Partnership.
 
    CONDITIONS TO THE OBLIGATIONS OF THE  PARTNERSHIPS.  The obligation of  each
of  the Partnerships  to effect  the Mergers  is subject  to the  fulfillment or
waiver in writing by the applicable Partnership on or before the Closing Date of
the following conditions:  (i) the  Partnership will have  received the  Stanger
Fairness  Opinions; (ii) there has  not been any material  adverse change in the
Company's ability to pay the Merger Consideration, or in the Company's business,
operations, properties, assets or condition,  financial or otherwise, since  the
date  of the Acquisition Agreement; (iii)  the representations and warranties of
the Company contained in the Acquisition Agreement will be true in all  material
respects  as of the date of the Acquisition Agreement and on the Effective Date;
(iv) the Company will have performed  or complied with in all material  respects
all obligations, agreements and covenants contained in the Acquisition Agreement
to be performed and complied with by it on or prior to the Closing Date; (v) all
necessary  consents and approvals  from third parties  shall have been obtained;
and (vi) the  Partnership shall  have received an  opinion from  counsel to  the
Company.
 
TERMINATION
 
    With   respect  to  any  Partnership,   the  Acquisition  Agreement  may  be
terminated, and the  Merger may  be abandoned, at  any time  before the  Closing
Date,  notwithstanding  approval  of  the  Merger  by  the  Unitholders  of  the
applicable Partnership:
 
        (a) by  the mutual  written consent  of the  Board of  Directors of  the
    Company and the General Partner of the Partnership;
 
        (b)  by either the Company or the Partnership if the Merger has not been
    consummated by March 31, 1997;
 
        (c) by either  the Company or  the Partnership if  a court of  competent
    jurisdiction   or  governmental,  regulatory  or  administrative  agency  or
    commission shall have issued a nonappealable final order, decree or  ruling,
    or  taken any  other action  having the  effect of  permanently restraining,
    enjoining or otherwise prohibiting  the Merger between  the Company and  the
    Partnership;
 
        (d)  by either the Company  or the Partnership if  the requisite vote of
    the Unitholders of the Partnership shall have not been obtained by March 31,
    1997;
 
        (e) by  the  Company if  (i)  the  General Partner  of  the  Partnership
    withdraws  or changes its approval of  the Acquisition Agreement in a manner
    adverse to the Company or has resolved to do so; (ii) the General Partner of
    the  Partnership   recommends  to   the  Unitholders   certain   alternative
    transactions;  (iii) any person  (other than the Company  or an affiliate of
    the Company) will have
 
                                       56
<PAGE>
    acquired voting rights to, or the right to acquire voting rights to, or  any
    group  has been formed which  has voting rights to,  or the right to acquire
    voting rights to, 20% or more of the outstanding Units of such  Partnership;
    or  (iv) if the Share Price, without  taking into account the application of
    the Share Price Range, exceeds $28.50;
 
        (f) by  the Company  or the  Partnership if  (i) any  representation  or
    warranty  of the Partnership or the  Company, respectively, set forth in the
    Acquisition Agreement shall be materially  untrue when made or shall  become
    materially  untrue or (ii) upon a breach of any covenant or agreement on the
    part of  the Partnership  or the  Company, respectively,  set forth  in  the
    Acquisition  Agreement, such that certain conditions to the Merger would not
    be satisfied  (either  (i) or  (ii)  above being  a  "Terminating  Breach");
    provided, however, that if such Terminating Breach is curable prior to March
    31,  1997 by the Company or the Partnership, as the case may be, through the
    exercise of its reasonable best  efforts and for so  long as the Company  or
    the  Partnership, as the case may  be, continues to exercise such reasonable
    best efforts, neither  the Partnership  nor the  Company, respectively,  may
    terminate the Acquisition Agreement;
 
        (g)  by the Partnership or the Company, if the Partnership enters into a
    definitive agreement accepting an alternative transaction; or
 
        (h) by the Partnership if the  Share Price, without taking into  account
    the  application  of the  Share Price  Range,  is less  than $21.50  and the
    Company has not agreed to pay the Additional Consideration.
 
FEES AND EXPENSES
 
    Substantial expenses have been  or will be incurred  by the Company and  the
Partnerships  in connection  with the  Offers and  the Mergers.  Those expenses,
excluding the Individual  Expenses (as  defined below),  will be  shared by  the
Company  and the Partnerships (the "Shared Expenses"). The "Individual Expenses"
include legal fees  and expenses, fees  and expenses of  investment bankers  and
other  financial advisors, the costs of the Appraisals and transfer fees payable
by the Company for  the Units acquired through  the Offers. Individual  Expenses
incurred  by the  Company will  be paid by  the Company  and Individual Expenses
incurred by a Partnership will be paid by the Partnership. The Company will  pay
50% of the Shared Expenses and 50% of the Shared Expenses will be allocated (the
"Allocated  Expenses") among the Partnerships pro rata based upon their relative
Net Asset Value (37.6%, 25.2% and  37.2% for IDS1, IDS2 and IDS3,  respectively)
and will be paid by the Partnership to which the expenses have been allocated if
the  Mergers are consummated. A  Partnership's Allocated Expenses and Individual
Expenses will be deducted from the assets of the Partnership when computing  the
Closing  Net Asset Value and an estimate  of such expenses was deducted from the
assets of  the  Partnerships  in  computing the  Net  Asset  Value.  Since  each
Partnership  will  be entitled  to make  a cash  distribution to  its pre-Merger
partners in an amount that will reduce the Closing Net Asset Value to an  amount
equal  to  the  Net  Asset  Value,  the  Partnership's  Allocated  Expenses  and
Individual Expenses will reduce the amount otherwise available for  distribution
to the pre-Merger partners in the Partnership.
 
    Except with respect to IDS1 as described below, in the event the Unitholders
in  the  Partnership  fail to  approve  the  Merger of  the  Partnership  by the
requisite vote, the  Partnership will  be required to  pay, in  addition to  its
Individual Expenses, only that percentage of its Allocated Expenses equal to the
percentage  of  its Units  voted  in favor  of the  Merger;  the balance  of the
Allocated Expenses will be paid by the Company.
 
    IDS2 and IDS3 will be obligated under the Acquisition Agreement to pay a pro
rata portion (based  upon that Partnership's  relative Net Asset  Value) of  the
Shared  Expenses and Individual Expenses otherwise payable by the Company if (i)
that Partnership has provided  information to or  entered into discussions  with
another  party regarding  the acquisition of  the Partnership, and  prior to the
date of the  Special Meeting  the General Partner  of the  Partnership does  not
reaffirm  its approval of  the Merger, and  the Unitholders fail  to approve the
Merger by  the  requisite vote,  (ii)  the Company  terminates  the  Acquisition
Agreement  because the General Partner of the Partnership withdraws its approval
of the Merger, recommends  an alternative transaction,  or third parties  obtain
voting rights
 
                                       57
<PAGE>
to 20% or more of the Units, or (iii) the Partnership enters into an alternative
transaction  and  the  Partnership  or the  Company  terminates  the Acquisition
Agreement. Because the  provisions of  the IDS1  Partnership Agreement  preclude
IDS1 from reimbursing the Company for expenses if the Merger is not consummated,
IDS1 will pay only its Individual Expenses if the IDS1 Merger is not consummated
for any reason.
 
    The  following table sets forth the estimated aggregate expenses expected to
be incurred by the  Company and the Partnerships  in connection with the  Offers
and the Mergers.
 
<TABLE>
<CAPTION>
Shared Expenses:
<S>                                                                              <C>
  Printing and mailing.........................................................  $  500,000
  Accounting fees..............................................................     255,000
  Real estate transaction costs................................................     165,000
  Information Agent/Inspector of Elections.....................................     425,000
  Other........................................................................     340,000
                                                                                 ----------
                                                                                  1,685,000
Individual Expenses:
  Legal fees...................................................................  $1,811,000
  Investment banking fees......................................................     955,000
  Partnership transfer fees for Tendered Units.................................     210,000
  Appraisal fee................................................................      92,000
                                                                                 ----------
                                                                                  3,068,000
                                                                                 ----------
Total Estimated Expenses.......................................................  $4,753,000
                                                                                 ----------
                                                                                 ----------
</TABLE>
 
    If  all of the Mergers are consummated, (i) of the Shared Expenses, 50% will
be paid by the Company and 18.8%, 12.6% and 18.6% will be paid by IDS1, IDS2 and
IDS3,  respectively,  and  (ii)   of  the  Individual  Expenses,   approximately
$1,410,000  will be paid by the Company and approximately $623,000, $418,000 and
$617,000 will be paid by IDS1, IDS2 and IDS3, respectively.
 
EFFECT OF TERMINATION
 
    If the Acquisition Agreement  is terminated, there will  be no liability  or
obligation  on  the part  of  any party  thereto  or its  respective affiliates,
partners, officers, directors or stockholders except (i) with respect to payment
of expenses described above, (ii) with  respect to the Standstill Agreement  and
(iii)  to the extent that such termination  results from the willful breach of a
party thereto of any of its representations, warranties, covenants or agreements
made in or pursuant to the Acquisition Agreement.
 
AMENDMENT
 
    Neither the Acquisition Agreement nor  any provision thereof may be  waived,
modified,  amended, discharged  or terminated  except in  writing signed  by the
party against which the enforcement of  such waiver or amendment is sought,  and
then only to the extent set forth in such instrument.
 
DISSENTERS' RIGHTS
 
    Units  held  by Unitholders  who properly  exercise dissenters'  rights with
respect thereto  in  connection  with  the Merger  in  accordance  with  Section
25.10.900  et seq. of the WULPA will not  be converted into the right to receive
the Merger Consideration, but the holder  of the Units will instead be  entitled
to  receive  payment of  the  fair value  of the  Units  in accordance  with the
provisions of the  WULPA unless and  until the  holder fails to  perfect or  has
effectively  withdrawn or lost his or her rights to receive fair value under the
WULPA. See "Dissenters' Rights of Unitholders."
 
                                       58
<PAGE>
AMENDMENTS TO THE PARTNERSHIP AGREEMENTS
 
    The IDS2 and IDS3 Partnership Agreements currently prohibit the sale of  any
property  by each  Partnership to its  General Partner or  "affiliates," as such
term is defined therein (including the Company). Accordingly, the IDS2 and  IDS3
Partnership  Agreements must be amended in order to consummate the IDS2 and IDS3
Mergers. The Acquisition Agreement provides  that the IDS2 and IDS3  Partnership
Agreements will be amended as described below.
 
    Section 13.3(c) of the IDS2 Partnership Agreement will be amended to add the
following subsection:
 
       (iii)  Notwithstanding any  provision of this  Agreement, the Partnership
    may merge  with and  into  Shurgard Storage  Centers, Inc.  (the  "Company")
    pursuant  to,  and consummate  all other  transactions contemplated  by, the
    terms of the Acquisition Agreement dated July 1, 1996, between the  Company,
    the  Partnership,  IDS/Shurgard  Income  Growth  Partnership  L.P.  and IDS/
    Shurgard Income Growth Partners L.P. III.
 
    Section 13.3(c) of the IDS3 Partnership Agreement will be amended to add the
following subsection:
 
       (iii) Notwithstanding any  provision of this  Agreement, the  Partnership
    may  merge  with and  into Shurgard  Storage  Centers, Inc.  (the "Company")
    pursuant to,  and consummate  all other  transactions contemplated  by,  the
    terms  of the Acquisition Agreement dated July 1, 1996, between the Company,
    the Partnership,  IDS/Shurgard  Income  Growth  Partnership  L.P.  and  IDS/
    Shurgard Income Growth Partners L.P. II.
 
    Approval  of  the Acquisition  Agreement  and the  transactions contemplated
thereby by Unitholders  of IDS2 and  IDS3 will also  constitute approval of  the
amendments  to the IDS2 and IDS3 Partnership Agreements, respectively, set forth
above. See "The Special Meetings -- The  IDS2 Special Meeting" and "-- The  IDS3
Special Meeting."
 
GENERAL PARTNER UNDERTAKING
 
    Concurrent  with  the execution  of the  Acquisition Agreement,  the General
Partner of each of the Partnerships  entered into an agreement with the  Company
(the  "General Partner Undertaking")  pursuant to which they  agreed to make the
recommendations to Unitholders contained in this Proxy Statement/Prospectus, and
agreed not  to  withdraw such  recommendations  except in  accordance  with  the
discharge  of  their fiduciary  duties  and as  otherwise  required by  law. The
Company acknowledged  that  the General  Partner  is entitled  to  withdraw  its
recommendation  in the event  that the Share Price  calculated without regard to
the Share Price Range is less than $21.50 and the Company does not elect to  pay
the Additional Consideration.
 
                           SOURCE AND AMOUNT OF FUNDS
 
    The Company expects to pay its portion of the Shared Expenses and Individual
Expenses  from borrowings  under the  Company's two  revolving credit facilities
(the "Credit  Facilities").  In  the  event  the  Company  pays  the  Additional
Consideration,  the  funds required  for  the Additional  Consideration  will be
obtained through the Credit Facilities. Under the Credit Facilities, the Company
is authorized to borrow up to $175 million, on the terms and conditions provided
in (i) the Loan  Agreement among the Company,  Seattle-First National Bank,  Key
Bank  of Washington, U.S. Bank and LaSalle National Bank dated September 9, 1996
(the "First Loan  Agreement") and (ii)  the Revolving Loan  Agreement among  the
Company,  SSC  Acquisitions Inc.  and  Nomura Asset  Capital  Corp. dated  as of
December 23, 1994 (the "Second Loan Agreement"). The Mergers are not subject  to
any  financing contingency,  and neither the  Company nor any  subsidiary of the
Company must secure additional financing in connection with the Mergers.
 
    The First  Loan Agreement  provides  for financing  of  up to  $175  million
through March 31, 1997 if the Second Loan Agreement is cancelled; otherwise, the
total commitment is $125 million through
 
                                       59
<PAGE>
March  31, 1997. From March 31, 1997  through maturity on September 9, 1998, the
total commitment is $100 million. The  financing under the First Loan  Agreement
is currently secured by certain real estate assets, bears interest at a rate per
annum  of either the lender's prime rate or LIBOR plus 100 to 162.5 basis points
depending upon the Company's senior unsecured credit rating, and includes a 12.5
to 20 basis point  utilization fee based  on the amount  outstanding. As of  the
date   of  the  Proxy  Statement/Prospectus,  the  Company  has  $99,060,000  of
borrowings outstanding under the First Loan Agreement. The Second Loan Agreement
provides for financing of  $50 million, secured by  certain real estate  assets,
bearing  interest at a rate per annum of either the prime rate of Citibank, N.A.
minus 50 basis points or LIBOR plus 175 basis points, requires a draw fee of  25
basis  points of the amount  drawn, and matures on December  30, 1996. As of the
date  of  this  Proxy  Statement/Prospectus,  the  Company  has  no   borrowings
outstanding  under the Second Loan Agreement. The amount available under each of
the Credit Facilities is a function  of the quarterly income performance of  the
properties  securing  the  respective  Credit Facility  and  the  quarterly debt
service payments for that Credit Facility.
 
    The amount outstanding under the First Loan Agreement includes approximately
$40,100,000 borrowed by the Company to pay for Units purchased in the Offers.
 
                 APPRAISALS AND OPINIONS OF FINANCIAL ADVISORS
 
PORTFOLIO APPRAISALS OF THE PARTNERSHIPS' PROPERTIES
 
    Stanger was  engaged  by  the  Partnerships  to  appraise  the  real  estate
portfolio of each of the Partnerships and has delivered a written summary of its
analysis,  based  upon the  review,  analysis, scope  and  limitations described
therein, as  to the  fair market  value of  each Partnership's  portfolio as  of
December  31, 1995. The  Partnerships selected Stanger  to provide the appraisal
because of its  experience and  reputation in connection  with partnerships  and
real  estate assets. In addition, the General Partners desired to take advantage
of the  cost efficiencies  associated with  having the  same party  provide  the
Appraisals  as  provided the  Stanger Fairness  Opinions. The  Appraisals, which
contain a  description  of  the assumptions  and  qualifications  made,  matters
considered  and limitations on the review and analysis, are attached as Appendix
B to  this Proxy  Statement/Prospectus and  should be  read in  their  entirety.
Certain  of  the material  assumptions,  qualifications and  limitations  to the
Appraisals are described below.
 
    EXPERIENCE OF STANGER.   Since its  founding in 1978,  Stanger has  provided
information,  research, investment  banking and  consulting services  to clients
throughout the  United States,  including major  member firms  of the  NYSE  and
insurance  companies  and  over  70  companies  engaged  in  the  management and
operation of  partnerships and  real estate  investment trusts.  The  investment
banking  activities of  Stanger include  financial advisory  services, asset and
securities valuations, industry  and company research  and analysis,  litigation
support  and  expert  witness  services,  and  due  diligence  investigations in
connection  with  both  publicly  registered  and  privately  placed  securities
transactions.
 
    Stanger, as part of its investment banking business, is regularly engaged in
the  valuation of  businesses and their  securities in  connection with mergers,
acquisitions and  reorganizations  and  for estate,  tax,  corporate  and  other
purposes.   Stanger's  valuation  practice  principally  involves  partnerships,
partnership securities and the assets typically owned through partnerships, such
as oil and  gas reserves, real  estate, cable television  systems and  equipment
leasing assets.
 
    SUMMARY  OF  METHODOLOGY.    At the  request  of  the  Partnerships, Stanger
evaluated each of the Partnerships' portfolio of real estate on a limited  scope
basis  utilizing  the  income  approach and  the  sales  comparison  approach to
valuation. Appraisers  typically use  up  to three  approaches in  valuing  real
property:  (i) the cost approach,  (ii) the income approach  and (iii) the sales
comparison approach. The type and age  of a property, market conditions and  the
quantity  and quality  of data  affect the applicability  of each  approach in a
specific  appraisal  situation.  The  value  estimated  by  the  cost   approach
incorporates  separate estimates  of the  value of  the unimproved  site and the
value of improvements, less  observed physical wear and  tear and functional  or
economic  obsolescence. The income  approach estimates a  property's capacity to
produce income through an analysis of the rental market, operating expenses  and
net   income.  Net   income  may  then   be  processed  into   a  value  through
 
                                       60
<PAGE>
either direct capitalization or discounted cash flow analysis, or a  combination
of  these  two methods.  The sales  comparison  approach involves  a comparative
analysis of the subject  property with other similar  properties that have  sold
recently  or  that  are  currently  offered  for  sale  in  the  market. Stanger
considered the cost approach to be less reliable than the income approach or the
sales comparison approach given the primary criteria used by buyers of the  type
of property appraised in the Appraisals.
 
    While the Appraisals were prepared for each Partnership's entire real estate
portfolio,  Stanger  analyzed  the  individual  properties  in  the  real estate
portfolio of  each  Partnership  by (i)  reviewing  each  property's  historical
operating  statements,  (ii)  reviewing  and  relying  on  specific  information
regarding prospective changes in rents  and expenses for each property  provided
by the Partnership, (iii) developing information from a variety of sources about
market  conditions  for  each  individual  property  and  (iv)  considering  the
projected cash flow for each property. Representatives of Stanger performed site
inspections on all  properties in  the Partnerships  during March  1996. In  the
course of these site visits, Stanger inspected the physical facilities, obtained
current  rental  and occupancy  information,  gathered information  on competing
properties and  the  local  market, visited  primary  competing  properties  and
interviewed   each  local  property  manager  or  assistant  manager  concerning
performance of the subject property and other factors.
 
    In conducting  the  Appraisals, Stanger  also  interviewed and  relied  upon
Partnership  and property management personnel to obtain information relating to
the condition  of each  property, including  any deferred  maintenance,  capital
budgets,    status   of   ongoing   or   newly   planned   property   additions,
reconfigurations,  improvements  and  other   factors  affecting  the   physical
condition of the property improvements.
 
    Stanger  also interviewed district or regional property management personnel
responsible for the properties and  the Partnerships' management personnel,  all
of  whom are employees  of the Company, to  discuss competitive conditions, area
economic  and  development  trends  affecting  the  properties,  historical  and
budgeted  operating revenues and expenses and occupancies. Stanger also reviewed
historical operating  statements  and 1996  operating  budgets for  the  subject
properties, and reviewed surveys of local self-service storage markets conducted
by local management personnel.
 
    To  define the occupancy, rental  rate and expense escalators  to be used in
developing property  operating  projections, Stanger  reviewed  the  acquisition
criteria  and  projection parameters  in use  in the  marketplace by  major self
storage investors, owners  and operators.  In addition,  Stanger reviewed  other
published  information  concerning  acquisition  criteria  in  use  by  property
investors at or around December  31, 1995. Further, Stanger interviewed  various
sources in local markets to identify recent sales of self storage properties and
derive   certain  valuation   indicators.  Sources  for   data  concerning  such
transactions included local  appraisers, property owners,  real estate  brokers,
tax assessors and real estate research firms.
 
    INCOME  APPROACH.    Stanger  then  determined  the  value  of  each  of the
Partnerships' portfolios using  the income  approach. During the  course of  the
site  inspections, Stanger identified competing  properties and obtained data on
local market  rental  rates  and  occupancy.  Stanger  reviewed  historical  and
budgeted gross income and income from ancillary sources for each property in the
portfolios  and  conducted discussions  with  the property  management personnel
concerning property  and  market trends  and  competitive conditions  and  other
pertinent information. After assessing the above factors, Stanger estimated each
property's  effective gross income based  upon unit configuration, market rental
rates, market occupancy rates and  estimates of ancillary income. Expenses  were
estimated  based on historical and budgeted operating expenses, discussions with
management and certain industry expense guidelines. Estimated expenses were then
deducted from  income  to arrive  at  each property's  estimated  net  operating
income.  Expenses  relating solely  to  investor reporting  and  accounting were
excluded.
 
    Stanger then employed  both direct capitalization  and discounted cash  flow
analysis to define the overall value of the portfolio. The direct capitalization
rate  used  by Stanger  was  based on  current  acquisition criteria  among self
storage  investors  and   reflected  in  specific   sales  transactions.   Where
 
                                       61
<PAGE>
appropriate,  the  capitalization  rate  used  for  an  individual  property was
adjusted to reflect valuation  factors unique to the  property, such as  overall
quality,  recent buildouts  and other  unique valuation  factors. Where deferred
maintenance or extraordinary capital expenditures were required Stanger adjusted
the capitalized value accordingly. Stanger applied capitalization rates  ranging
from  9.25% to  10.25% to the  projected net  operating income from  each of the
Partnerships' properties which  were considered  to be  at stabilized  occupancy
during the 12 months ending December 31, 1996.
 
    In  applying discounted cash  flow analysis, projections  of cash flows from
each property (assuming no indebtedness thereon)  were developed for a ten  year
period  ending  December  31,  2005.  Income  and  expense  escalators  used  in
developing the projections were based on projection parameters currently in  use
by property investors, market factors, historical and budgeted financial results
for  each property and inflation rates.  Income escalators generally ranged from
3% to 3.5%. In highly competitive markets or where a property's operations  were
below  stabilized  levels, income  escalators  were adjusted  as  Stanger deemed
appropriate or  until stabilized  operations  were achieved.  Effective  expense
escalators generally ranged from 2.7% to 3.5%.
 
    Stanger  then  capitalized, at  terminal  capitalization rates  ranging from
10.0% to 10.50% for IDS1, 10.0% to  10.25% for IDS2 and 10.25% to 10.75%  (11.0%
for  the office property) for  IDS3, 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 12.0%  to
12.5%  for IDS1,  12.0% to 12.25%  for IDS2 and  12.25% to 12.5%  for IDS3, 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 was $40,370,000, $30,520,000 and $50,890,000 for IDS1, IDS2
and IDS3, respectively,  after adjustment  for any  deferred maintenance  items,
joint  venture interests and the value of  certain land parcels held for resale,
as applicable.
 
    SALES COMPARISON  APPROACH.   Stanger  compiled transaction  data  involving
properties  similar  in type  to  the Partnerships'  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. In  the case  of the  IDS3 portfolio,  the valuation
included consideration of the value of excess land parcels held for resale.  The
indicated  aggregate value  of the  portfolio of  properties based  on the sales
comparison approach was $40,050,000, $30,460,000 and $51,350,000 for IDS1,  IDS2
and  IDS3, respectively,  after adjustment  for any  deferred maintenance items,
joint venture interests and the value  of certain land parcels held for  resale,
as applicable.
 
    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  Partnerships' entire
portfolio. Stanger adjusted the value conclusion for joint venture interests and
excess land parcels  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
 
                                       62
<PAGE>
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 Partnerships  are typically  purchased and  sold based upon
their  income  characteristics.  Stanger  gave  the  sales  comparison  approach
secondary consideration.
 
    CONCLUSIONS  AS TO  VALUE.  Based  on the  valuation methodologies described
above, Stanger assigned a value to the portfolio of real property assets of each
Partnership. The following table sets forth the final portfolio value conclusion
of Stanger with respect to each of the Partnerships.
 
<TABLE>
<CAPTION>
                                                                PORTFOLIO VALUE
PARTNERSHIP                                                        CONCLUSION
- ----------------------------------------------------------  ------------------------
<S>                                                         <C>
IDS1......................................................      $     40,370,000
IDS2......................................................            30,520,000
IDS3......................................................            50,890,000
                                                            ------------------------
    Total.................................................      $    121,780,000
                                                            ------------------------
                                                            ------------------------
</TABLE>
 
    ASSUMPTIONS, LIMITATIONS AND QUALIFICATIONS OF PORTFOLIO
APPRAISALS.  Stanger  utilized certain  assumptions to  determine the  appraised
value  of  the portfolios  under the  income approach  and the  sales comparison
approach.  See  Appendix  B  for  a  discussion  of  the  specific  assumptions,
limitations and qualifications of the Appraisals.
 
    The  Appraisals reflect Stanger's valuation of the real estate portfolios of
the Partnerships as  of December  31, 1995, in  the context  of the  information
available  on such  date as  well as the  operating information  available as of
March 31, 1996. Events occurring after December 31, 1995, and before the closing
of the Mergers could affect the properties or assumptions used in preparing  the
real  estate  portfolio  appraisals. Stanger  has  no obligation  to  update the
Appraisals on the basis of subsequent  events. In connection with preparing  the
Appraisals,  Stanger was not  engaged to, and consequently  did not, prepare any
written report or compendium of its analysis for internal or external use beyond
the analysis set forth  in Appendix B. Stanger  will not deliver any  additional
written summary of the analysis.
 
    COMPENSATION  AND MATERIAL RELATIONSHIPS.   The Partnerships  paid Stanger a
fee of $92,000 to  prepare the Appraisals. In  addition, Stanger is entitled  to
reimbursement  for  reasonable  travel and  out-of-pocket  expenses  incurred in
making site  visits  and  preparing  the Appraisals  and  the  Stanger  Fairness
Opinion,  subject to  a maximum of  $35,000, and is  entitled to indemnification
against  certain  liabilities,  including  certain  liabilities  under   federal
securities  laws.  The  fees  for the  Appraisals  were  negotiated  between the
Partnerships and Stanger and payment thereof is not dependent upon completion of
the Mergers. As noted  in "-- Opinions of  the Partnerships' Financial  Advisor"
below,  certain predecessor  entities of the  Company engaged  Stanger to render
other  appraisals,  consulting  or  related   services  prior  to  the   present
engagement. Stanger also has been compensated for rendering the Stanger Fairness
Opinion. See "-- Opinion of the Partnerships' Financial Advisor."
 
OPINION OF THE PARTNERSHIPS' FINANCIAL ADVISOR
 
    Stanger was also engaged by the Partnerships to deliver a written summary of
its  determination as  to the  fairness of  the consideration,  from a financial
point of view, to be received by the Unitholders of each of the Partnerships  in
the  Mergers. The full  text of the  Stanger Fairness Opinion,  which contains a
description of the assumptions made,  matters considered and limitations on  the
review   and   analysis,   is   attached   as   Appendix   C   to   this   Proxy
Statement/Prospectus and should be read in its entirety. Certain of the material
assumptions and limitations to the Stanger Fairness Opinion are described below.
The summary set forth below does not purport to be a complete description of the
analyses used by Stanger in rendering the Stanger Fairness Opinion. Arriving  at
a  fairness opinion is a complex  analytical process not necessarily susceptible
to partial analysis or amenable to summary description.
 
    Except  for  certain  assumptions  described  more  fully  below  which  the
Partnerships   advised  Stanger  that  it  would  be  reasonable  to  make,  the
Partnerships imposed no conditions or limitations on
 
                                       63
<PAGE>
the scope  of  Stanger's investigation  or  the  methods and  procedures  to  be
followed in rendering the Stanger Fairness Opinion. The Partnerships have agreed
to  indemnify  Stanger  against  certain liabilities  arising  out  of Stanger's
engagement to prepare and deliver the Stanger Fairness Opinion.
 
    SUMMARY OF MATERIALS CONSIDERED
 
    In the course  of Stanger's  analysis to  render its  opinion regarding  the
Mergers, Stanger: (i) reviewed drafts of this Proxy Statement/Prospectus and the
Acquisition  Agreement in substantially  the forms intended  to be finalized and
filed with the  Commission; (ii)  reviewed the Partnerships'  and the  Company's
Annual  Reports on Form 10-K for the  fiscal years ended December 31, 1993, 1994
and 1995, and the Partnerships' and the Company's Quarterly Reports on Form 10-Q
for the quarter  ended March 31,  1996; (iii) reviewed  the Company's pro  forma
financial  statements  and pro  forma  schedules prepared  by  the Partnerships'
management and  the  Company's  management; (iv)  performed  appraisals  of  the
properties  owned  by the  Partnerships as  of December  31, 1995;  (v) reviewed
information regarding  purchases and  sales of  self storage  properties by  the
Company  or any affiliated entities during  the prior year and other information
available relating to  acquisition criteria  for self  storage properties;  (vi)
reviewed  internal financial analyses and forecasts prepared by the Partnerships
(based in part on the  Appraisals) of the current  net liquidation value of  the
Partnerships'   assets   and   projections  of   cash   flow   from  operations,
distributions, and going  concern values for  the Partnerships; (vii)  conducted
discussions with senior management of the Partnerships and the Company regarding
the  conditions in self  storage property markets, conditions  in the market for
sales or acquisitions of properties similar to those owned by the  Partnerships,
current and projected operations and performance, financial condition and future
prospects  of the  properties and  the Partnerships;  (viii) reviewed historical
market prices,  trading volume  and  dividends for  the  Common Stock  and  (ix)
conducted  such other studies, analyses, inquiries and investigations as Stanger
deemed appropriate.
 
    SUMMARY OF ANALYSIS
 
    The following is  a summary  of certain financial  and comparative  analyses
reviewed  by Stanger in connection with and  in support of its fairness opinion.
The summary of  the opinion  and analysis  of Stanger  set forth  in this  Proxy
Statement/Prospectus  is qualified in its entirety by reference to the full text
of such opinion.
 
    APPRAISALS.    In  preparing  its  opinion,  Stanger  performed  independent
appraisals  of the Partnerships' portfolios of  properties. During the course of
the Appraisals, Stanger performed site inspections of each property owned by the
Partnerships, conducted inquiries  into local market  conditions affecting  each
property,  reviewed  historical  and  budgeted  operating  statements  for  each
property, conducted  interviews with  the Partnerships  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   "--  Portfolio   Appraisals  of  the
Partnerships' Properties." Stanger observed that the Merger Consideration equals
the pro rata  interest per  Unit in  the Appraised  Values, as  adjusted by  the
General  Partners for non-real  estate assets and  liabilities of the applicable
Partnership, estimated Merger costs and costs  associated with the Offers to  be
borne  by the applicable Partnership and the Unitholders' share of the resulting
Net Asset  Value  according to  the  provisions of  the  applicable  Partnership
Agreement. Stanger believes that the Net Asset Values of the Partnerships, which
are  based primarily on the appraised  values of the Partnerships' portfolios of
properties, are a reasonable basis for determining the consideration offered  in
the Mergers.
 
    REVIEW  OF LIQUIDATION ANALYSIS.   Stanger reviewed  an analysis prepared by
the respective  managements of  the Partnerships  of the  estimated  liquidation
values  of  each  of  the  Partnerships  utilizing  estimates  prepared  by  the
Partnerships of expenses associated  with such a  liquidation and the  appraised
fair market value of the properties as determined by the Appraisals.
 
                                       64
<PAGE>
    The  liquidation analysis assumed that  the properties in each Partnership's
portfolio were sold concurrently to an independent third party buyer at a  price
equal  to the appraised value of the  portfolio. Costs of such property sales to
independent  third  parties  were  estimated   by  the  Partnerships  to   total
approximately  4% of  real estate asset  value and are  comprised of transaction
costs, taxes, commissions and legal and  other closing costs. Such amounts  were
based  on prevailing transfer  tax rates in  the locale of  each property and on
estimates of the Partnerships based on their knowledge and experience in similar
real estate transactions.  The liquidation analysis  also assumed that  non-real
estate  assets and liabilities except amortizable assets were sold at book value
and that  net  proceeds were  distributed  among  the General  Partner  and  the
Unitholders  of the  applicable Partnership  in accordance  with its Partnership
Agreement.
 
    Stanger observed  that  the  Merger  Consideration  exceeded  the  estimated
liquidation  value per Unit  by approximately $4,  $5 and $9  for IDS1, IDS2 and
IDS3, respectively. The fact that the Merger Consideration exceeds the estimated
value which  would  be  received  by  Unitholders  in  a  liquidation  of  their
applicable  Partnership supports Stanger's conclusion as  to the fairness of the
Merger Consideration.
 
    REVIEW OF GOING CONCERN ANALYSIS.   Stanger reviewed financial analyses  and
projections  prepared by the managements of  each of the Partnerships concerning
estimated  cash  flows  and  distributions  from  continued  operation  of   the
Partnerships  as independent  stand-alone entities, and  estimated sale proceeds
from the liquidation of the portfolio of properties owned by the Partnerships in
2000. The  analyses  incorporated estimates  of  cash flow  from  operating  the
properties,  payments on existing debt,  entity level general and administrative
costs, and cash  distributions to Unitholders  from operations and  sale of  the
properties  owned by the Partnerships during  a five-year projection period. The
analyses and projections assumed,  among other things,  that (i) operating  cash
flow  for the portfolios would  grow at a compound  annual rate of approximately
3.0% for IDS1 (after property tax adjustments), 3.5% for IDS2 and 4.0% for  IDS3
over  the  projection period;  (ii)  general and  administrative  expenses would
increase at an average rate of 3.5% per annum over the projection period;  (iii)
the  properties  would  be  sold in  a  single  transaction at  the  end  of the
projection period at a price based  on property cash flows for 2001  capitalized
at a rate of 10.0% to 10.5%; (iv) selling costs equal to 4% of real estate asset
value  would be incurred; (v)  cash flows were discounted at  a rate of 12.0% to
13.0% for IDS1, 12.25%  to 13.25% for  IDS2 and 12.5% to  13.5% for IDS3,  which
rates  take into consideration, among other factors, differences in the leverage
levels of each Partnership,  and (vi) the  net proceeds of  the sale plus  other
remaining  non-real estate assets  less liabilities of  the Partnership would be
distributed according to the provisions of the Partnership Agreements.
 
    Stanger observed that the estimated going concern values resulting from  the
above  analyses ranged from  $251 to $235  per IDS1 Unit  compared with the IDS1
Offer Price of $257 per IDS1 Unit, $218 to $203 per IDS2 Unit compared with  the
IDS2  Offer Price of $222 per IDS2 Unit  and $304 to $283 per IDS3 Unit compared
with the  IDS3 Offer  Price of  $308 per  IDS3 Unit.  The fact  that the  Merger
Consideration exceeds the estimated value per Unit of continuing to operate each
Partnership  as a going concern supports Stanger's conclusion as to the fairness
of the Merger Consideration.
 
    REVIEW OF TENDER OFFER AND SECONDARY  MARKET PRICES.  Stanger observed  that
Units  of the  Partnerships have  been purchased  in recent  months both through
transactions on the  informal secondary  market for  partnership securities  and
through a tender offer.
 
    Stanger  observed  that Units  in  each of  the  Partnerships have  been the
subject of one  prior tender  offer. According  to information  provided by  the
Partnerships,  on February 28, 1996  Everest commenced a tender  offer for up to
4.9% of the IDS1  Units, IDS2 Units  and IDS3 Units.  Stanger observed that  the
prices  offered in this tender  offer were $110 per  IDS1 Unit compared with the
IDS1 Offer Price of  $257 per IDS1  Unit, $120 per IDS2  Unit compared with  the
IDS2  Offer Price of $222 per IDS2 Unit and $112 per IDS3 Unit compared with the
IDS3 Offer Price of $308  per IDS3 Unit. Stanger also  observed that on May  20,
1996  Public  Storage, Inc.  sold  1,824.5 IDS1  Units,  2,038.3 IDS2  Units and
 
                                       65
<PAGE>
1,602.5 IDS3 Units to the Company for $200 per IDS1 Unit, $180 per IDS2 Unit and
$190 per IDS3 Unit  (plus, in each case,  four days' accrued interest)  compared
with  the Offer Prices  of $257 per IDS1  Unit, $222 per IDS2  Unit and $308 per
IDS3 Unit.
 
    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  prices reported  for  Units in  the informal  secondary  market
between  January 1, 1995 and the end of  the first quarter of 1996 were $200 per
IDS1 Unit compared with  the IDS1 Offer  Price of $257 per  IDS1 Unit, $186  per
IDS2  Unit compared with the IDS2 Offer Price of $222 per IDS2 Unit and $200 per
IDS3 Unit compared with the IDS3 Offer Price of $308 per IDS3 Unit.
 
    CONCLUSIONS
 
    Stanger concluded that, based  upon the foregoing and  its analysis and  the
assumptions, qualifications, and limitations stated below, and as of the date of
the  Stanger Fairness  Opinion, the Merger  Consideration to be  received by the
Unitholders in  the  Mergers is  fair  to  the Unitholders  of  each  respective
Partnership from a financial point of view.
 
    ASSUMPTIONS
 
    In   rendering  the  Stanger  Fairness   Opinion,  Stanger  relied,  without
independent verification, on the accuracy and completeness of all financial  and
other  information  contained  in  the Proxy  Statement/Prospectus  or  that was
otherwise publicly available or furnished or otherwise communicated to  Stanger.
Stanger   has  not   made  an  independent   evaluation  or   appraisal  of  the
determinations  of  the   non-real  estate   assets  and   liabilities  of   the
Partnerships. Stanger relied upon the balance sheet value determinations for the
Partnerships and the adjustments made by the General Partners to the real estate
portfolio appraisals to arrive at the Net Asset Values. Stanger also relied upon
the assurance of the Company, the Partnerships and the General Partners that the
calculations  made  to determine  allocations  within each  of  the Partnerships
between the General Partner and  Unitholders are consistent with the  provisions
of each Partnership's Partnership Agreement, that any financial projections, pro
forma  statements, projections, budgets, value estimates or adjustments provided
to Stanger were reasonably prepared or adjusted on bases consistent with  actual
historical  experience and  reflect the  best currently  available estimates and
good  faith  judgments,  that   no  material  changes   have  occurred  in   the
Partnership's  values  subsequent  to March  31,  1996,  or in  the  real estate
portfolio values subsequent to December 31, 1995, which are not reflected in the
Partnership's Net Asset Values herein, and that the Partnerships and the General
Partners are not aware  of any information or  facts regarding the  Partnerships
that  would  cause  the information  supplied  to  Stanger to  be  incomplete or
misleading.
 
    LIMITATIONS AND QUALIFICATIONS OF FAIRNESS OPINION
 
    Stanger was not asked  to and therefore  did not: (i)  select the method  of
determining   the  consideration   offered  in   the  Mergers;   (ii)  make  any
recommendations to the Unitholders with respect to whether to approve or  reject
the  Mergers or whether to  select the Offers made by  the Company or the Shares
offered in the  Mergers; (iii) express  any opinion  as to the  fairness of  the
Merger  Consideration to be received in the Mergers if the actual Share Price is
less than $22.25  or (iv) express  any opinion  as to the  business decision  to
effect  the Mergers, alternatives to the Mergers, tax factors resulting from the
Mergers, the  allocation of  expenses relating  to the  Mergers and  the  Offers
between the Company and the Partnerships or among the Partnerships, or any other
terms  of the Mergers other than  the Merger Consideration. The Stanger Fairness
Opinion is based on business, economic, real estate and securities markets,  and
other  conditions as of July 1, 1996, and  does not reflect any changes in those
conditions that may have occurred since that date.
 
    In connection with preparing the  Stanger Fairness Opinion, Stanger was  not
engaged  to, and consequently did not,  prepare any written report or compendium
of its analysis for internal  or external use beyond  the analysis set forth  in
Appendix  C.  Stanger will  not deliver  any additional  written summary  of the
analysis.
 
                                       66
<PAGE>
    COMPENSATION AND MATERIAL RELATIONSHIPS
 
    Stanger has been paid fees by the Partnerships of $375,000 for preparing the
Stanger Fairness  Opinion relating  to the  Mergers and  $105,000 for  preparing
fairness  opinions relating to  the Offers. In addition,  in connection with its
preparation of the Appraisals and the fairness opinions relating to the  Mergers
and  the Offers,  Stanger will  be reimbursed  for all  reasonable out-of-pocket
expenses, including  legal fees,  up to  a maximum  of $35,000  and  indemnified
against  certain liabilities,  including certain  liabilities under  the federal
securities laws. The fee  was negotiated between  the Partnerships and  Stanger.
Payment  of the fee to Stanger is  not dependent upon completion of the Mergers.
The Company retained  Stanger to perform  appraisals and to  deliver a  fairness
opinion  and special reports in connection with the Consolidation in March 1994.
Stanger was  paid  approximately  $1,025,000  and  was  reimbursed  for  certain
expenses  in connection  with such services.  In addition, the  Company has paid
certain  nominal  amounts  to  Stanger  for  subscriptions  to  Stanger-prepared
national  publications.  Stanger also  has  been compensated  for  preparing the
Appraisals. See "-- Portfolio Appraisals of the Partnerships' Properties."
 
OPINION OF THE COMPANY'S FINANCIAL ADVISOR
 
    In March 1996, the Company retained Alex. Brown to act as financial  advisor
to  the  Special  Committee  in  connection with  the  Offers  and  the Mergers,
including rendering its opinion to the Board  of Directors of the Company as  to
the   fairness  to  the  Company,  from  a  financial  point  of  view,  of  the
consideration  payable  to   the  Unitholders  and   General  Partners  of   the
Partnerships.  The  Company  and  Alex.  Brown  subsequently  executed  a formal
engagement letter on June 20, 1996.
 
    At the July  1, 1996 meeting  of the Special  Committee, representatives  of
Alex.  Brown rendered to the Board of Directors of the Company its opinion that,
as of that  date, and subject  to the assumptions  made, matters considered  and
limitations  set forth in  such opinion and  summarized below, the consideration
payable by the Company in the Offers and the Mergers was fair, from a  financial
point  of  view, to  the Company.  No  limitations were  imposed by  the Special
Committee upon Alex. Brown with respect to the investigations made or procedures
followed by it in rendering its opinion.
 
    THE FULL  TEXT OF  ALEX. BROWN'S  WRITTEN OPINION  DATED JULY  1, 1996  (THE
"ALEX.  BROWN OPINION"), WHICH SETS FORTH, AMONG OTHER THINGS, ASSUMPTIONS MADE,
MATTERS CONSIDERED  AND LIMITATIONS  ON THE  REVIEW UNDERTAKEN,  IS ATTACHED  AS
APPENDIX  D TO  THIS PROXY  STATEMENT/PROSPECTUS AND  IS INCORPORATED  HEREIN BY
REFERENCE. THE ALEX. BROWN OPINION ADDRESSES ONLY THE FAIRNESS TO THE COMPANY OF
THE CONSIDERATION PAYABLE  BY THE  COMPANY IN THE  OFFERS AND  THE MERGERS.  THE
ALEX.  BROWN OPINION DOES NOT ADDRESS THE FAIRNESS OF THE OFFERS AND THE MERGERS
TO THE UNITHOLDERS OR  GENERAL PARTNERS OF THE  PARTNERSHIPS. THE DISCUSSION  OF
THE  ALEX. BROWN OPINION IN THIS  PROXY STATEMENT/PROSPECTUS IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO THE FULL TEXT OF THE ALEX. BROWN OPINION.
 
    In connection with rendering the  Alex. Brown Opinion, Alex. Brown  reviewed
certain  publicly available financial information  and certain internal analyses
and other information concerning the  Company and the Partnerships furnished  to
it  by the Company.  Alex. Brown also  held discussions with  the members of the
senior management of the Company regarding  the businesses and prospects of  the
Company  and the Partnerships and  the joint prospects of  a combined entity. In
addition, Alex. Brown (i) reviewed the reported prices and trading activity  for
Shares  and  the  Units  of  each of  the  Partnerships,  (ii)  compared certain
financial and stock market information for the Company with similar  information
for  certain comparable  companies whose  securities are  publicly traded, (iii)
reviewed the financial terms of  certain recent real estate transactions  deemed
comparable  in whole  or in  part, (iv)  reviewed the  terms of  the Acquisition
Agreement and certain related documents and (v) performed such other studies and
analyses and considered such other factors as it deemed appropriate.
 
    In conducting its  review and  arriving at  the Alex.  Brown Opinion,  Alex.
Brown  assumed and relied upon,  without independent verification, the accuracy,
completeness and fairness of the information furnished to or otherwise  reviewed
by  or  discussed with  it. With  respect  to the  financial projections  of the
Partnerships and the Company and other information relating to the prospects  of
the  Partnerships and the Company provided to  Alex. Brown by each entity, Alex.
Brown assumed that
 
                                       67
<PAGE>
such projections and  other information were  reasonably prepared and  reflected
the   best  currently  available  judgments  and  estimates  of  the  respective
managements of  the  Partnerships  and  the Company  as  to  the  likely  future
financial  performances of their respective entities and of the combined entity.
Alex. Brown expressed no view as to such projections or the assumptions on which
they were based. Alex. Brown did not make an independent evaluation or appraisal
of the assets of the Partnerships. However, Alex. Brown reviewed the  Appraisals
with  respect to the real  estate assets, although it  was not permitted to rely
upon the Appraisals for purposes of the Alex. Brown Opinion. Alex. Brown assumed
that the Appraisals were prepared on a reasonable basis. The Alex. Brown Opinion
is based on market, economic and other  conditions as they existed and could  be
evaluated as of the date thereof.
 
    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 the material analyses performed and material factors as described  in
the Alex. Brown Report and as presented to the Special Committee.
 
    HISTORICAL  FINANCIAL  POSITION.    Alex. Brown  reviewed  and  analyzed for
informational purposes the  historical and  current financial  condition of  the
Company  and the Partnerships which included: (i) an assessment of the Company's
and the  Partnerships' recent  financial  statements; (ii)  an analysis  of  the
Company'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 conclusion  based upon  that
information.
 
    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 Common Stock,  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.
 
    ANALYSIS OF CERTAIN OTHER PUBLICLY TRADED COMPANIES.  This analysis examines
a  company's valuation in the public market  as compared to the valuation in the
public market of  other selected publicly  traded companies, in  each case as  a
multiple  of  its  funds  from  operations, defined  as  per  share  net income,
excluding extraordinary  gains or  losses, plus  depreciation from  real  estate
assets  ("Funds  From Operations"),  estimated for  1996  and 1997.  Alex. Brown
compared  certain  financial  information  relating  to  the  Company  and   the
Partnerships  to certain  corresponding information with  respect to  a group of
four publicly traded REITs engaged  primarily in the acquisition, operation  and
management of storage center properties, namely the following companies: Storage
USA, Inc., Storage Trust Realty, Sovran Self Storage, Inc. and PS (collectively,
the  "Selected  Companies"). Such  financial  information included,  among other
things, (i) common equity market prices, (ii) per share estimated 1996 and  1997
Funds  From Operations and (iii) ratios of common equity market prices per share
("Equity Values")  to  estimated Funds  From  Operations.  In the  case  of  the
Selected  Companies  the  financial information  used  was based  on  the latest
reported quarterly period as derived from publicly available information and  on
estimated  Funds from Operations for calendar years 1996 and 1997 as reported by
REALTY STOCK  REVIEW. Alex.  Brown  obtained reference  ranges of  multiples  of
Equity  Value to estimated calendar  year 1996 Funds From  Operations of 9.9x to
12.5x, with a mean of  11.0x, and Equity Value  to estimated calendar year  1997
Funds  From Operations of 8.8x to 11.3x, with  a mean of 10.1x, in each case for
the Selected Companies. Applying such reference multiple ranges to the estimated
calendar year 1996 and 1997 Funds From Operations for each of the  Partnerships,
Alex.  Brown determined reference  valuation ranges from  the Partnerships (on a
combined basis)  of $105.3  million to  $132.0 million,  with a  mean of  $116.6
million,  based upon  estimated calendar  year 1996  Funds From  Operations, and
$108.8  million   to  $136.3   million,   with  a   mean  of   $120.4   million,
 
                                       68
<PAGE>
based  upon estimated calendar year  1997 Funds From Operations.  As a result of
the  foregoing  procedures,  Alex.  Brown   noted  that  the  consideration   of
approximately  $106.6 million in the aggregate to  be paid by the Company in the
Offers and the  Mergers was at  the lower end  of, or below,  the ranges of  the
values obtained with respect to the Selected Companies.
 
    ANALYSIS  OF SELECTED  REAL ESTATE ACQUISITIONS.   Alex.  Brown reviewed the
financial terms, to the  extent publicly available, of  15 proposed, pending  or
completed real estate transactions in the storage center industry (the "Selected
Transactions"),  and calculated  for each of  the Selected  Transactions and the
Offers and the Mergers the capitalization rate, defined as net operating  income
(minus  capital expenditures) divided by the  purchase price for the properties.
The Selected Transactions  consisted of (i)  the Company's bid  to acquire  four
National   Self  Storage  properties,  (ii)  the  Company's  September  1,  1994
acquisition of Colonial  Self-Storage, (iii)  Storage USA  Inc.'s September  12,
1995 acquisition of 13 storage center properties, (iv) Storage USA, Inc.'s April
13,  1995 acquisition of  25 storage center properties,  (v) Storage USA, Inc.'s
April 13, 1995 acquisition of 16  storage center properties, (vi) Storage  Trust
Realty's acquisition of Balcor/Colonial Storage Income Fund -- 86, (vii) Storage
Trust  Realty's October  6, 1995  acquisition of  14 storage  center properties,
(viii) Sovran  Self Storage,  Inc.'s June  30, 1995  acquisition of  12  storage
center  properties, (ix)  U-Haul International,  Inc.'s bid  for Balcor/Colonial
Storage Income Fund  -- 86, (x)  PS's June 14,  1996 acquisition of  Prudential-
Bache/Watson   &  Taylor,  Ltd.-1,  (xi)  PS's  June  14,  1996  acquisition  of
Prudential-Bache/Watson & Taylor, Ltd.-2, (xii)  PS's June 14, 1996  acquisition
of   Prudential-Bache/Watson  &  Taylor,  Ltd.-3,  (xiii)  PS's  June  14,  1996
acquisition of  Prudential-Bache/Watson &  Taylor,  Ltd.-4, (xiv)  PS's  pending
acquisition  of  Storage  Properties,  Inc.  and  (xv)  PS's  February  29, 1996
acquisition of Southern Self Storage. Alex. Brown noted that the  capitalization
rate  based  on the  last  reported annual  net  operating income  prior  to the
transaction (year ended December 31, 1995  in the case of the Partnerships)  was
8.7%  for the Partnerships (on a combined basis),  which was at the lower end of
the range of 8.5%  to 10.3%, with  a mean of 9.4%,  determined for the  Selected
Transactions.  Alex. Brown also noted that  the capitalization rate based on the
projected net operating income for the year in which the acquisition took  place
was  9.6% for the Partnerships  (on a combined basis),  falling in the middle of
the range of  9.0% to 10.5%,  with a mean  of 9.7% determined  for the  Selected
Transactions.  All multiples for the Selected  Transactions were based on public
information available at the time  of announcement of such transaction,  without
taking  into account differing  market and other conditions  during the two year
period during which the Selected Transactions occurred.
 
    DISCOUNTED CASH FLOW ANALYSIS.   Alex. Brown  obtained reference values  for
each  of the  Partnerships by  means of a  discounted cash  flow analysis, which
values a business based on the current value of the future cash flow that it  is
projected  to generate. To establish a current value under this approach, future
cash flow must be estimated and  an appropriate discount rate determined.  Alex.
Brown  used projections and other information provided by the managements of the
Partnerships to  estimate  free cash  flows,  defined as  total  revenues  minus
property  operating and maintenance expenses, property management expenses, real
estate taxes and capital expenditures ("Free  Cash Flows"), for the years  ended
1996  through 2006, inclusive,  with respect to the  assets of the Partnerships,
using  discount  rates  ranging   from  11.0%  to   13.0%  and  terminal   value
capitalization  rates applied to projected 2006 Free Cash Flow ranging from 9.0%
to 11.5%. Alex. Brown arrived  at such discount rates  based on its judgment  of
the weighted average cost of capital of the Company and arrived at such terminal
values based on its review of the Selected Transactions. This analysis indicated
a  range  of  values  for  the  Partnerships'  real  estate  of  $106,459,161 to
$133,081,669 on a Free Cash Flow basis, as compared to the imputed value of  the
Partnerships'  real estate of $121,780,000 under the terms of the Offers and the
Mergers.
 
    Alex.  Brown  also  applied   a  discounted  cash   flow  analysis  to   the
Partnerships'   projected  Funds  From  Operations,   and  funds  available  for
distribution, defined as Funds From Operations less capital expenditures, tenant
improvements  and  commissions  ("Funds  Available  for  Distribution"),   using
discount  rates ranging  from 11.0% to  13.0% and  terminal value capitalization
rates applied to Funds From Operations and Funds Available for Distribution,  as
the case may be, projected for the year
 
                                       69
<PAGE>
2006, ranging from 9.0% to 11.5%. Alex. Brown noted that this analysis indicated
a  range of  values for the  Partnerships of $102,002,516  to $127,549,435 based
upon estimated Funds From Operations and $98,397,791 to $123,189,094 based  upon
estimated  Funds  Available  for  Distribution. Based  upon  the  Appraisals and
certain balance  sheet adjustments  provided  by management,  the  Partnerships'
indicated  Net Asset Value, which is  also nominally the amount of consideration
to be paid by the Company in the Offers and the Mergers, is $106,578,185,  which
falls  at the lower end  of the reference ranges  of imputed values derived from
the analysis.
 
    PRO FORMA COMBINED EARNINGS ANALYSIS.   Alex. Brown analyzed the Offers  and
the  Mergers with respect  to the resulting  dilution/accretion to the Company's
estimated Funds From  Operations for the  years ending 1996  and 1997  (assuming
different  levels of  cash and stock  comprising the  consideration paid), after
taking into  account any  potential cost  savings and  other synergies  but  not
taking  into account nonrecurring costs relating  to the Offers and the Mergers.
Alex. Brown noted  that after  taking into  account potential  cost savings  and
other  synergies for  the years ending  1996 and 1997,  respectively, and before
nonrecurring costs  relating  thereto,  the  Offers and  the  Mergers  would  be
slightly  accretive to  the Company's estimated  Funds From  Operations for such
years.
 
    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.  Alex. Brown did  not, however, reach  any independent conclusion from
the consideration of those factors.
 
    ANALYSIS OF  OFFERS  ABSENT  CONSUMMATION  OF MERGERS.    Alex.  Brown  also
examined the financial effects to the Company of consummating one or more of the
Offers  without also consummating the related  Merger. Alex. Brown observed that
while a failure  to consummate  the Merger  would result  in the  assets of  the
relevant  Partnership not being owned entirely by the Company and certain of the
anticipated combination synergies not  being realized by  the Company, the  cash
purchase  price offered  by the  Company in each  of the  Offers generally would
result in accretion to  the Company's estimated Funds  From Operations on a  per
Unit  basis, excluding  nonrecurring transaction  costs, regardless  of how many
Units were actually purchased.
 
    No company used in the analysis  of other publicly traded companies nor  any
transaction used in the analysis of selected mergers and acquisitions summarized
above is identical to the Company, the Partnerships or any of the Offers and the
Mergers.  Accordingly, such analyses  must take into  account differences in the
financial and  operating  characteristics  of the  Selected  Companies  and  the
companies  in the Selected Transactions and  other factors that would affect the
public trading value  and acquisition value  of the Selected  Companies and  the
Selected Transactions, respectively.
 
    While  the foregoing summary  describes all analyses  and factors that Alex.
Brown deemed  material  in  rendering the  Alex.  Brown  Opinion, it  is  not  a
comprehensive description of all analyses and factors considered by Alex. Brown.
The preparation of a fairness opinion is a complex process that involves various
determinations  as  to the  most appropriate  and  relevant method  of financial
analysis and the application  of these methods  to the particular  circumstances
and,  therefore,  the  process  of  preparing such  an  opinion  is  not readily
susceptible to summary description. Alex. Brown believes that its analyses  must
be  considered as a whole and that selecting portions of its analyses and of the
factors considered  by it,  without  considering all  analyses and  the  factors
considered  by it,  could create  an incomplete  view of  the evaluation process
underlying the Alex. Brown  Opinion. The analyses performed  by Alex. Brown  are
not  necessarily indicative  of actual  values or  future results,  which may be
significantly more  or less  favorable than  those suggested  by such  analyses.
Accordingly,  such analyses and estimates  are inherently subject to substantial
uncertainty. Additionally, analyses relating to the  value of a business do  not
purport to be appraisals or to reflect the prices at which the business actually
may  be sold.  Furthermore, no opinion  is being  expressed as to  the prices at
which Shares may trade at any future time.
 
    Pursuant to a letter agreement dated  June 20, 1996 between the Company  and
Alex.  Brown, the  fees payable  to Alex.  Brown for  rendering the  Alex. Brown
Opinion are $400,000. In addition, the
 
                                       70
<PAGE>
Company has agreed  to reimburse  Alex. Brown for  its reasonable  out-of-pocket
expenses  incurred  in connection  with  rendering financial  advisory services,
including fees and disbursements of its legal counsel. The Company has agreed to
indemnify Alex.  Brown  and  its  directors,  officers,  agents,  employees  and
controlling  persons for  certain costs,  expenses, losses,  claims, damages and
liabilities related to  or arising out  of its rendering  of services under  its
engagement as financial advisor.
 
    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 Company 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."
 
    The  Special Committee retained Alex. Brown to act as its advisor based upon
Alex. Brown having acted  as managing underwriter of  a past offering of  Common
Stock  and as financial advisor to a special committee of the Board of Directors
of the Company regarding  its merger with Shurgard  Incorporated and based  upon
Alex.  Brown's qualifications, reputation, experience and expertise. Alex. Brown
is an internationally  recognized investment  banking firm and,  as a  customary
part  of  its  investment  banking  business, is  engaged  in  the  valuation of
businesses and their  securities in  connection with  mergers and  acquisitions,
negotiated underwritings, private placements and for other purposes. Alex. Brown
may  actively trade the equity securities of the Company for its own account and
for the account of its customers and,  accordingly, may at any time hold a  long
or  short position  in such  securities. Alex. Brown  maintains a  market in the
Common Stock  and  regularly  publishes  research  reports  regarding  the  REIT
industry  and the  businesses and securities  of the Company  and other publicly
traded companies in the REIT industry.
 
                                       71
<PAGE>
                  PRO FORMA CONSOLIDATED FINANCIAL STATEMENTS
 
The following pro  forma consolidated  balance sheets as  of June  30, 1996  set
forth  the effect of the Mergers  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 Mergers 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 Company  not related to  the Mergers and  the effect of  the
Mergers  as  if  such had  occurred  on January  1,  1995. The  Mergers  will be
accounted for under the purchase method of accounting for business combinations.
The purchase price of the Mergers 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 assuming the
purchase by the Company of 63,234, 37,164 and 50,609 of the outstanding units of
IDS1, IDS2 and IDS3,  respectively as completed on  September 12, 1996. 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  Company'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 Company'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    Proxy
Statement/Prospectus.
 
                                       72
<PAGE>
                      PRO FORMA CONSOLIDATED BALANCE SHEET
                                 JUNE 30, 1996
<TABLE>
<CAPTION>
                                                           COMPANY
                                 COMPANY      COMPANY     PRE-MERGER      IDS1         IDS2         IDS3
(IN THOUSANDS)                  HISTORICAL  ADJUSTMENTS (1) PRO FORMA  HISTORICAL   HISTORICAL   HISTORICAL   ADJUSTMENTS (2)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
<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       40,089        65,216       --           --           --          (42,538)
Cash, cash equivalents and
 other assets.................    56,777        1,358        58,135       1,137          650        1,152          (790)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total assets..............  $631,562      $41,447      $673,009     $29,407      $25,197      $35,131      $ (6,260)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
Accounts payable and other
 liabilities..................  $ 57,881       --          $ 57,881     $   710      $   924      $   917      $  1,545
Notes payable.................   132,250       41,447       173,697       --           2,831       10,333        --
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total liabilities.........   190,131       41,447       231,578         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        (5,356)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
    Total liabilities and
     stockholders' equity.....  $631,562      $41,447      $673,009     $29,407      $25,197      $35,131      $ (6,260)
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
                                ---------   -----------   ----------   ----------   ----------   ----------   -----------
 
<CAPTION>
                                  COMPANY
                                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.................    186,861
                                -----------
    Total liabilities.........    248,838
                                -----------
Minority interest.............      2,561
Stockholders' equity..........    505,085
                                -----------
    Total liabilities and
     stockholders' equity.....   $756,484
                                -----------
                                -----------
</TABLE>
 
- ----------------------------------
(1)  Company adjustments reflect the purchase of 63,234, 37,164 and 50,609 Units
    of IDS1, IDS2 and IDS3, for $257,  $222 and $308 per unit, respectively,  as
    if  such occurred on January 1, 1995.  The aggregate purchase price of these
    shares  was  $40,089,000  which  was  funded  through  borrowing  under  the
    Company's  new line of credit. The Company's  new line of credit provides up
    to $125,000,000, bears interest at LIBOR  plus 1 5/8% and matures  September
    1998.  Additional funds totalling $1,358,000 were borrowed to pay the unpaid
    amount of the Company's estimated costs of $2,300,000 related to the Mergers
    and the Offers.
 
(2) 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...................................    (18,724)    (8,239)   (15,575)    (42,538)(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............................................     (2,730)    (2,819)       193      (5,356)(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 Company prior
        to  the  Mergers  and  will  continue to  be  carried  at  the Company'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 Company's 30% interest in SJP II.
 
       (e)  Historical  assets have  been reduced  to eliminate  (i) amortizable
        assets of  $13,000,  $73,000  and  $261,000 for  IDS1,  IDS2  and  IDS3,
        respectively,  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
        Company's 30% interest in SJP II.
 
       (h) Amount reflects  step-up to  Net Asset Value  less the  value of  the
        Tendered Units.
 
                                       73
<PAGE>
                 PRO FORMA CONSOLIDATED STATEMENT OF NET INCOME
                         SIX MONTHS ENDED JUNE 30, 1996
<TABLE>
<CAPTION>
                                                           COMPANY
(IN THOUSANDS, EXCEPT SHARE      COMPANY      COMPANY     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      1,184(2)      2,079      --           --           --            (1,326)
Property management revenue...       1,734     --             1,734      --           --           --              (673)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total revenue.............      51,142      1,184        52,326      3,278        2,255        3,673         (1,999)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
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      1,146        21,263      1,416          882        1,482         (1,480)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
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)    (1,492)(4)    (6,740 )    --            (139)        (432)            80
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total other income
     (expense)................      (5,003)    (1,492)       (6,495 )     (549)        (415)        (838)         1,353
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income (loss).............  $   15,114    $  (346)    $  14,768    $   867      $   467      $   644      $    (127)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income per share..........  $     0.65    $ (0.01)    $    0.64
                                ----------  -----------   ----------
                                ----------  -----------   ----------
Weighted average number of
 shares.......................  23,199,023     --         23,199,023     --           --           --         2,607,563
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Weighted average number of
 units........................                                         148,202      115,110      119,215
                                                                      ----------   ----------   ----------
                                                                      ----------   ----------   ----------
 
<CAPTION>
                                  COMPANY
(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..............      (7,231)
                                -----------
    Total other income
     (expense)................      (6,944)
                                -----------
Net income (loss).............  $   16,619
                                -----------
                                -----------
Net income per share..........  $     0.64
                                -----------
                                -----------
Weighted average number of
 shares.......................  25,806,586
                                -----------
                                -----------
Weighted average number of
 units........................
</TABLE>
 
- ----------------------------------
(1)  Company adjustments recognize  the acquisition of the  Tendered Units as if
    such had occurred on January 1, 1995.
 
(2) Amount  reflects  the  Company's  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 the actual  borrowing rate of 7.2% per annum  on
    additional  debt incurred to  finance the acquisition  of the Tendered Units
    and the transaction costs.
 
                                       74
<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...................  $    (666) $    (230) $    (430) $  (1,326)(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.............................................         --         20         60         80(i)
Weighted average number of shares............................    931,422    730,933    945,208  2,607,563(j)
- ----------------------------------
(a)  Historical amounts have  been adjusted to eliminate the  Company's 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 Company's  interest in the General  Partners and administrative  reimbursements
     paid to the Company by the Partnerships.
 
(c)  Amount represents elimination of advertising fees paid by the Partnerships to the Company.
 
(d)  Amount reflects elimination of property management fees paid by the Partnerships to the Company.
 
(e)   Amount reflects the change in depreciation of  storage centers. Depreciation on a new basis 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. The adjustment is calculated as
     follows:
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                        EST.
                                                                          ASSIGNED     USEFUL      SIX MONTH
                                                                            VALUE       LIFE     DEPRECIATION
                                                                         -----------  ---------  -------------
<S>                                                                      <C>          <C>        <C>
    Land...............................................................   $  24,975      N/A              --
    Buildings..........................................................      97,900     30 yrs.    $   1,633
    Equipment & fixtures...............................................         989      5 yrs.           99
                                                                         -----------             -------------
                                                                          $ 123,864                $   1,732
    Historical depreciation/amortization.......................................................        1,651
    Adjustment.................................................................................    $      81
                                                                                                 -------------
                                                                                                 -------------
</TABLE>
 
<TABLE>
<S>                                                                    <C>          <C>        <C>          <C>
(f)  Amount reflects elimination of administrative reimbursements paid by the Partnerships to the Company.
(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 Company's 30% minority interest in the earnings of SJP II.
(i)   Amount reflects the refinancing  of the debt of the  Partnerships at 7.2% per annum  on the Company's new line of
     credit. The Company's new line of credit provides up to $125,000,000, bears interest at LIBOR + 1 5/8% and matures
     September 1998.
(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.................................  16,251,138   8,250,408  15,587,572
Company's interest in General Partner........................    (530,000)   (338,125)   (431,875)
                                                               ----------  ----------  ----------
Consideration allocable to Unitholders participating in the
Mergers......................................................  $23,285,562 $18,273,313 $23,630,196
                                                                 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.................................     931,422     730,933     945,208
                                                               ----------  ----------  ----------
                                                               ----------  ----------  ----------
</TABLE>
 
                                       75
<PAGE>
                 PRO FORMA CONSOLIDATED STATEMENT OF NET INCOME
                          YEAR ENDED DECEMBER 31, 1995
<TABLE>
<CAPTION>
                                                           COMPANY
(IN THOUSANDS, EXCEPT SHARE      COMPANY      COMPANY     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       2,223(2)     3,619      --           --           --            (2,487)
Property management revenue...       2,978         802(3)     3,780      --           --           --            (1,424)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total revenue.............      96,771       5,009      101,780      6,465        4,309        7,225         (3,911)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
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       3,438       44,173      2,788        1,705        2,811         (2,568)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Minority interest in income...      --          --           --           (264)       --           --               264
Interest and other income.....         885        (368)(8)       517       109           10           35
Interest expense..............     (12,038)     (1,116)(9)   (13,154 )     (130)       (254)        (961)           363
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
    Total other income
     (expense)................     (11,153)     (1,484)     (12,637 )     (285)        (244)        (926)           627
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net (loss) income.............  $   29,582   $   1,954    $  31,536    $ 2,503      $ 1,461      $ 1,885      $  (1,931)
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Net income per share..........  $     1.43   $    0.78    $    1.36
                                ----------  -----------   ----------
                                ----------  -----------   ----------
Weighted average number of
 shares.......................  20,675,536   2,518,385    23,193,921     --           --           --         2,607,563
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
                                ----------  -----------   ----------  ----------   ----------   ----------   -----------
Weighted average number of
 units........................                                         148,202      115,110      119,215
                                                                      ----------   ----------   ----------
                                                                      ----------   ----------   ----------
 
<CAPTION>
                                  COMPANY
(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..............     (14,136 )
                                -----------
    Total other income
     (expense)................     (13,465 )
                                -----------
Net (loss) income.............  $   35,454
                                -----------
                                -----------
Net income per share..........  $     1.37
                                -----------
                                -----------
Weighted average number of
 shares.......................  25,801,484
                                -----------
                                -----------
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  Management Company  Merger 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
         Company 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 Company's stockholders during 1995.
 
(2)  Amount  reflects  the  Company's  interest  in  the  Partnerships' earnings
    allocated to Unitholders.
 
(3) Amounts reflects increase  in property management  fees from the  Management
    Company Merger.
 
(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 Management Company Merger.
 
(8) Amount reflects decrease in investment income  as a result of using cash  to
    finance the acquisitions described in (1) above.
 
(9)  Amount reflects reduction of interest expense  as a result of cash provided
    by the offering of common stock described in (1) above.
 
                                       76
<PAGE>
(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.................  $  (1,278) $    (448) $    (761)  $  (2,487)(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         16        217         363(h)
Weighted average number of shares..........................    931,422    730,933    945,208   2,607,563(i)
                                                             ---------  ---------  ---------  -----------
                                                             ---------  ---------  ---------  -----------
</TABLE>
 
       -----------------------------------------
       (a) Historical  amounts have  been adjusted  to eliminate  the  Company's
        interest related to the Tendered Units and the Company'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 Company's interest  in
        the  General  Partners  and administrative  reimbursements  paid  to the
        Company by the Partnerships.
 
       (c) Amount  represents  elimination  of  advertising  fees  paid  by  the
        Partnerships to the Company.
 
       (d)  Amount reflects elimination of property  management fees paid by the
        Partnerships to the Company.
 
       (e) Amount  reflects  the  change in  depreciation  of  storage  centers.
        Depreciation  on a new basis 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. The
        adjustment is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                                   EST.
                                                                     ASSIGNED     USEFUL       ANNUAL
                                                                       VALUE       LIFE     DEPRECIATION
                                                                    -----------  ---------  -------------
<S>                                                                 <C>          <C>        <C>
Land..............................................................   $  24,975      N/A              --
Buildings.........................................................      97,900     30 yrs.    $   3,265
Equipment & fixtures..............................................         989      5 yrs.          198
                                                                    -----------             -------------
                                                                     $ 123,864                    3,463
Historical depreciation/amortization......................................................        3,538
                                                                                            -------------
Adjustment................................................................................    $     (75)
                                                                                            -------------
                                                                                            -------------
</TABLE>
 
       (f) Amount reflects elimination of administrative reimbursements paid  by
        the Partnerships to the Company.
 
       (g)  Amount  reflects  the  elimination  of  the  Company's  30% minority
        interest in the earnings of SJP II.
 
       (h) Amount reflects the  refinancing of the debt  of the Partnerships  at
        7.2%  per annum on the  Company's new line of  credit. The Company's new
        line of credit provides  up to $125,000,000, bears  interest at LIBOR  +
        1 5/8% and matures September 1998.
 
       (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................................   16,251,138   8,250,408   15,587,572
Company's interest in General Partner.......................     (530,000)   (338,125)    (431,875)
                                                              -----------  ----------  -----------
Consideration allocable to Unitholders participating in the
Merger......................................................  $23,285,562  $18,273,313 $23,630,196
                                                                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.................................      931,422     730,933      945,208
                                                              -----------  ----------  -----------
                                                              -----------  ----------  -----------
</TABLE>
 
                                       77
<PAGE>
                    COMPARISONS OF PARTNERSHIPS AND COMPANY
 
    The  information below  highlights a  number of  the significant differences
between the Partnerships and the Company relating to, among other things,  forms
of   organization,  investment  objectives,  policies  and  restrictions,  asset
diversification, capitalization,  management  structure,  and  investor  rights.
These  comparisons are intended to assist Unitholders in understanding how their
investments will be  changed if, as  a result  of the Mergers,  their Units  are
exchanged  for Shares. Following the captioned  sections is a summary discussion
of the expected  effects of  the Mergers on  Unitholders who  receive Shares  in
exchange for their Units.
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                   FORM OF ORGANIZATION
The  Partnerships  are  limited partnerships  The Company is a Delaware corporation formed
organized under  Washington law  formed  for  for  the  purpose  of  investing  in  a real
the purpose of  investing in  a real  estate  estate  portfolio  consisting  primarily  of
portfolio  consisting   primarily  of   self  self  storage facilities.  The Company began
storage facilities.  The  Partnerships  have  operations  on  March  1,  1994  through the
been  taxed  as  partnerships  for   federal  Consolidation  and  became self-administered
income  tax  purposes.  See  "Business   and  through  the  Management  Company  Merger in
Properties of the Partnerships."              March 1995. The Company qualifies as a  REIT
                                              for federal income tax purposes.
</TABLE>
 
    THE  PARTNERSHIPS ARE LIMITED PARTNERSHIPS UNDER WASHINGTON STATE LAW, WHILE
THE COMPANY IS  ORGANIZED AS A  DELAWARE CORPORATION. THE  PARTNERSHIPS AND  THE
COMPANY  ARE EACH VEHICLES  APPROPRIATE FOR HOLDING  REAL ESTATE INVESTMENTS AND
AFFORD  PASSIVE  INVESTORS,  SUCH  AS  UNITHOLDERS  AND  STOCKHOLDERS,   CERTAIN
BENEFITS,  INCLUDING LIMITED  LIABILITY, A PROFESSIONALLY  MANAGED PORTFOLIO AND
THE AVOIDANCE OF DOUBLE-LEVEL TAXATION  ON DISTRIBUTED INCOME. THE  PARTNERSHIPS
ARE  UNDER THE CONTROL OF THEIR GENERAL  PARTNERS, WHILE THE COMPANY IS GOVERNED
BY ITS BOARD OF DIRECTORS. IN ADDITION, THERE ARE SIGNIFICANT DIFFERENCES IN THE
TAX TREATMENT OF  THE PARTNERSHIPS AS  PARTNERSHIPS AND THE  COMPANY AS A  REIT.
SOME OF THE MATERIAL TAX DIFFERENCES ARE SUMMARIZED BELOW UNDER THE CAPTIONS "--
TAXATION OF TAXABLE INVESTORS" AND "-- TAXATION OF TAX-EXEMPT INVESTORS."
 
                                       78
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                   LENGTH OF INVESTMENT
An  investment in  each of  the Partnerships  Unlike the Partnerships, the Company intends
was presented  to  Unitholders as  a  finite  to continue its operations for an indefinite
length  investment, with  the Unitholders to  time period and  has no  specific plans  for
receive  regular  cash distributions  out of  disposition of the  assets acquired  through
the  Partnership's net  operating income and  the Consolidation or subsequent
special distributions of  net sale  proceeds  acquisitions.  The  Company  is  required to
through the liquidation of the Partnership's  distribute at least 95% of its REIT  Taxable
real  estate investments. Under  each of the  Income  (as  defined  in  "Material  Federal
Partnership   Agreements,  the  Partnerships  Income Tax Considerations -- Taxation of the
will terminate December  31, 2030;  however,  Company as a REIT -- Annual Distribution Re-
each  of  the General  Partners of  IDS1 and  quirements") to  maintain its  REIT  status.
IDS2  stated  its intention  of  selling its  However, the  Company is  allowed to  retain
Partnership's  properties within a period of  its net sale or refinancing proceeds for new
seven to nine years and the General  Partner  investments,  capital  expenditures, working
of IDS3  stated  its  intention  of  selling  capital   reserves   or   other  appropriate
within five to  ten years after  acquisition  purposes.
or    development    of    the   properties.
Unitholders were  advised that  sale of  the
Partnerships'   assets  would,  however,  be
dependent  upon   market   conditions.   See
"Business and Properties of the
Partnerships."
</TABLE>
 
    UNITHOLDERS  IN  EACH  OF  THE  PARTNERSHIPS  EXPECT  LIQUIDATION  OF  THEIR
INVESTMENTS WHEN THE ASSETS OF THE PARTNERSHIP ARE LIQUIDATED. IN CONTRAST,  THE
COMPANY  DOES NOT  EXPECT TO  DISPOSE OF  ITS INVESTMENTS  WITHIN ANY PRESCRIBED
PERIODS AND, IN  ANY EVENT, PLANS  TO RETAIN  THE NET SALE  PROCEEDS FOR  FUTURE
INVESTMENTS.   STOCKHOLDERS  ARE   EXPECTED  TO  ACHIEVE   LIQUIDITY  FOR  THEIR
INVESTMENTS BY TRADING SHARES OF THE COMMON  STOCK IN THE PUBLIC MARKET AND  NOT
THROUGH THE LIQUIDATION OF THE COMPANY'S ASSETS. THE COMMON STOCK MAY TRADE AT A
DISCOUNT FROM, OR PREMIUM TO, THE LIQUIDATION VALUE OF THE COMPANY'S PROPERTIES.
 
<TABLE>
<S>                                           <C>
                                   NATURE OF INVESTMENT
The  Units  of  each  Partnership constitute  The Shares  constitute equity  interests  in
equity  interests entitling  each Unitholder  the  Company.  Each   stockholder  will   be
to  its pro rata share of cash distributions  entitled to his or her pro rata share of the
made to the Unitholders of the  Partnership.  dividends  made with  respect to  the Common
Each of the Partnership Agreements specifies  Stock.  The   dividends   payable   to   the
how cash available for distribution, whether  Stockholders are not fixed in amount and are
arising   from   operations   or   sales  or  only paid  when  declared by  the  Company's
refinancings,  is  to  be  shared  among the  Board of Directors. The  Company has in  the
General   Partner   and   Unitholders.   The  past made quarterly dividends and intends to
distributions made  to the  Unitholders  are  continue   to  make  such  payments  in  the
not fixed  in amount  and depend  upon  each  future.  In order to qualify  as a REIT, the
Partnership's  operating  results  and   the  Company  must distribute at least 95% of its
amounts received upon sale or refinancing of  REIT Taxable Income.
the Partnership's assets.
</TABLE>
 
    BOTH THE UNITS AND SHARES  REPRESENT EQUITY INTERESTS ENTITLING THE  HOLDERS
THEREOF  TO  PARTICIPATE IN  THE  GROWTH OF  THE  PARTNERSHIPS AND  THE COMPANY,
RESPECTIVELY. DISTRIBUTIONS AND DIVIDENDS PAYABLE WITH RESPECT TO THE UNITS  AND
SHARES  DEPEND  UPON  THE  PERFORMANCE  OF  THE  PARTNERSHIPS  AND  THE COMPANY,
RESPECTIVELY.
 
                                       79
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                              PROPERTIES AND DIVERSIFICATION
The investment  portfolio  of  each  of  the  The    Company   operates   a   network   of
Partnerships  is  limited   to  the   assets  approximately  273  storage  centers located
acquired with the initial equity raised from  throughout the United States and in  Europe.
the General Partners and Unitholders as well  Of these properties, it owns, as of June 30,
as   the  debt  financing  obtained  by  the  1996, directly and through its wholly  owned
Partnership within the established borrowing  subsidiaries  and  joint ventures,  185 self
restrictions.  The   Partnerships  are   not  storage  properties located in 19 states and
authorized  to   issue   additional   equity  Europe  and  containing  approximately  12.0
securities  to   expand   their   investment  million   net   rentable  square   feet.  In
portfolios. See "Business and Properties  of  addition,  the  Company  owns  two  business
the Partnerships."                            parks and a  commercial building  containing
                                              approximately  220,000  net  rentable square
                                              feet located  in  the  Seattle  metropolitan
                                              area. The Company is currently expanding its
                                              portfolio of real estate properties and real
                                              estate  based investments through the use of
                                              equity and debt capital, joint ventures  and
                                              the   acquisition  and  development  of  new
                                              facilities. See "Business and Properties  of
                                              the Company."
</TABLE>
 
    THE  INVESTMENT PORTFOLIO  FOR EACH  PARTNERSHIP WAS  LIMITED TO  THE ASSETS
ACQUIRED WITH ITS INITIAL EQUITY AND  LIMITED DEBT FINANCING. THE COMPANY  HOLDS
AN  INVESTMENT  PORTFOLIO SUBSTANTIALLY  LARGER  AND MORE  DIVERSIFIED  THAN THE
PORTFOLIO OF ANY OF  THE PARTNERSHIPS AND WITH  THE POTENTIAL FOR FUTURE  GROWTH
THROUGH  ACQUISITION AND DEVELOPMENT. AN INVESTMENT IN THE COMPANY SHOULD NOT BE
VIEWED AS  AN  INVESTMENT  IN A  SPECIFIC  POOL  OF ASSETS  BUT  INSTEAD  AS  AN
INVESTMENT  IN AN ONGOING REAL ESTATE  INVESTMENT BUSINESS, SUBJECT TO THE RISKS
NORMALLY ATTENDANT TO ONGOING REAL ESTATE OWNERSHIP AND TO THE RISKS RELATED  TO
PROPERTY DEVELOPMENT.
 
                                       80
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                  PERMITTED INVESTMENTS
Each  of the Partnerships  was authorized to  Under its Bylaws, the Company is  authorized
invest in self storage facilities and office  to  invest  in self  storage  facilities and
and business  parks. The  Partnerships  have  office  and  business  parks,  and  may make
limited their  investments to  self  storage  mortgage loans, secured by properties of the
facilities,  with  the  exception  of  IDS3,  type in  which the  Company may  invest,  as
which  has invested in an office building as  long as such investments  do not exceed  25%
well   as   self  storage   facilities.  See  of its  "total assets"  (as defined  in  the
"Business and Properties of the               Bylaws)   and   satisfy   certain  specified
Partnerships."                                underwriting criteria. As of June 30,  1996,
                                              over   90%  of  the   Company's  assets  are
                                              invested  in  self  storage  properties  and
                                              cash.  In  addition,  the  Company  may make
                                              other commercial real estate investments  if
                                              the    Board   of   Directors   specifically
                                              authorizes such investments  after making  a
                                              determination  that the  investments offer a
                                              means  of  maximizing   the  value  of   the
                                              Company's   assets   or   diversifying   its
                                              portfolio to protect the value of its  other
                                              investments.  The  Company  has  no  present
                                              plans to  make  such other  commercial  real
                                              estate investments.
</TABLE>
 
    THE  PARTNERSHIPS AND THE COMPANY HAVE CONCENTRATED THEIR INVESTMENTS ALMOST
SOLELY IN SELF  STORAGE FACILITIES. THE  BYLAWS OF THE  COMPANY AUTHORIZE IT  TO
MAKE  OTHER COMMERCIAL  REAL ESTATE  INVESTMENTS OR  MORTGAGE LOANS,  SECURED BY
APPROPRIATE INVESTMENTS, IF THE BOARD OF DIRECTORS MAKES CERTAIN  DETERMINATIONS
REQUIRED  BY  THE BYLAWS.  ACCORDINGLY, THE  COMPANY'S  INVESTMENTS MAY  BE MORE
DIVERSIFIED  THAN   THE  INVESTMENTS   OF  THE   PARTNERSHIPS.  THE   INVESTMENT
DIVERSIFICATION,  IF IT OCCURS, WHILE POTENTIALLY SERVING AS A HEDGE AGAINST THE
RISK OF HAVING ALL OF THE COMPANY'S INVESTMENTS LIMITED TO A SINGLE ASSET GROUP,
WOULD EXPOSE THE COMPANY TO THE RISK OF OWNING AND OPERATING ASSETS NOT DIRECTLY
RELATED TO ITS PRIMARY BUSINESS.
 
                                       81
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                    ADDITIONAL EQUITY
None of the  Partnerships are authorized  to  The   Board   of  Directors   may,   in  its
issue  equity  securities  other  than   the  discretion, issue additional equity
Units.   Therefore,   no  dilution   of  the  securities consisting  of  Common  Stock  or
Unitholders'   distributive  share  of  cash  Preferred Stock,  provided  that  the  total
available  for distribution can occur. After  number of shares issued does not exceed  the
the Unitholders receive cumulative            authorized  number of shares of Common Stock
distributions  equal  to  their   collective  or   Preferred  Stock   set  forth   in  the
capital  contributions  plus  a   cumulative  Company's  Certificate of Incorporation. The
noncompounded return  of  9%  per  annum  on  Company  expects to  raise additional equity
their "adjusted  capital contributions,"  as  from  time to time to increase its available
defined in the  Partnership Agreements,  the  capital.  The issuance  of additional shares
Unitholders' share  of  cash  available  for  of  either Common  Stock or  Preferred Stock
distribution decreases from 95% to 80%.       may result in the dilution of the  interests
                                              of the stockholders.
</TABLE>
 
    THE  PARTNERSHIPS  ARE NOT  AUTHORIZED TO  ISSUE  ADDITIONAL UNITS  OR OTHER
EQUITY INTERESTS AND, THEREFORE, THE UNITS  ARE NOT SUBJECT TO DILUTION,  EXCEPT
AS  PROVIDED  IN  THE  PARTNERSHIP  AGREEMENTS.  IN  CONTRAST,  THE  COMPANY HAS
SUBSTANTIAL FLEXIBILITY  TO RAISE  EQUITY CAPITAL  TO FINANCE  ITS BUSINESS  AND
AFFAIRS  THROUGH  THE SALE  OF  COMMON STOCK  OR  PREFERRED STOCK.  THE COMPANY,
THROUGH THE  ISSUANCE OF  NEW EQUITY  SECURITIES, MAY  SUBSTANTIALLY EXPAND  ITS
CAPITAL  BASE TO  MAKE NEW REAL  ESTATE INVESTMENTS. THE  ISSUANCE OF ADDITIONAL
EQUITY SECURITIES BY THE  COMPANY MAY DILUTE THE  INTERESTS OF STOCKHOLDERS  AND
THE COMPANY MAY ISSUE PREFERRED STOCK WITH PRIORITIES OR PREFERENCES OVER COMMON
STOCK WITH RESPECT TO DIVIDENDS AND LIQUIDATION PROCEEDS.
 
<TABLE>
<S>                                           <C>
                                    BORROWING POLICIES
Each  of the  Partnerships is  authorized to  The Company  is permitted  to borrow,  on  a
borrow   funds  necessary,   appropriate  or  secured or unsecured basis, funds to finance
advisable in  conducting  its  business  and  its  business,  subject  to  the restriction
affairs. The  Partnership  Agreements  place  contained   in   the  Bylaws   limiting  its
various restrictions on the authority of the  borrowing to not more than 50% of its "total
Partnerships to  borrow funds.  Furthermore,  assets"  and  not  more  than  300%  of  its
as a matter of  overall policy, each of  the  "adjusted  net  worth" (as  those  terms are
Partnerships limited the amount it  borrowed  defined in the Bylaws). As of June 30, 1996,
to   finance  its   acquisitions  and  other  the   Company's   debt   to   total   market
business   activities.  See   "Business  and  capitalization was 23%.
Properties  of  the  Partnerships"  for  the
outstanding   borrowings  of   each  of  the
Partnerships as of June 30, 1996.
</TABLE>
 
    IN CONDUCTING ITS  BUSINESS, THE  COMPANY MAY  BORROW FUNDS  SUBJECT TO  THE
LIMITATION  ON INDEBTEDNESS  OF 50%  OF TOTAL  ASSETS AND  300% OF  ADJUSTED NET
WORTH. THE COMPANY  MAY BE MORE  LEVERAGED THAN ANY  OF THE PARTNERSHIPS,  WHICH
HAVE  NOT INCURRED SIGNIFICANT BORROWINGS IN  COMPARISON TO THE OVERALL VALUE OF
THEIR ASSETS. BORROWING FUNDS MAY ALLOW THE COMPANY TO SUBSTANTIALLY EXPAND  ITS
ASSET  BASE, BUT  WILL ALSO  INCREASE THE COMPANY'S  RISKS DUE  TO ITS LEVERAGED
INVESTMENTS.
 
                                       82
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                       RESTRICTIONS UPON RELATED PARTY TRANSACTIONS
Each of the Partnership Agreements restricts  The  Bylaws   prohibit  the   Company   from
the  respective  Partnership  from  entering  engaging in a  transaction with a  director,
into  certain business transactions with the  officer,   advisor,    person   owning    or
General  Partners and its affiliates, except  controlling 10% or more of any class of  the
to  the extent  that such  transactions were  Company's outstanding voting securities,  or
specifically  disclosed  in  the  disclosure  any   affiliate   of   the    aforementioned
document  pursuant to  which the  Units were  ("interested parties"), except to the extent
offered  and   sold  to   the  public.   The  that   such  transactions  are  specifically
Partnership Agreement  for  IDS1  authorizes  authorized  by the terms  of the Bylaws. The
the  Partnership   to   enter   into   other  Bylaws  prohibit  the Company  from entering
transactions with its General Partner or its  into  a   transaction   with  any   of   the
affiliates  only if the terms and conditions  interested  parties  unless  the  terms  and
of  the transaction  have been  disclosed to  conditions of  such transactions  have  been
the  Unitholders in advance  and approved by  disclosed to  the  Board  of  Directors  and
the  Unitholders holding of record more than  approved by  a  majority  of  directors  not
75%  of  the  outstanding  Units  and,  with  otherwise   interested    in   the    matter
respect  to  any  proposed  services  to  be  (including   a   majority   of   independent
rendered to the Partnership, the              directors),  and such directors in approving
compensation for such services is comparable  the transaction  have  determined it  to  be
and competitive with that charged by a third  fair, competitive and commercially
party   rendering  comparable  services  and  reasonable, and on terms and conditions  not
certain  other conditions are met. While the  less favorable  to  the Company  than  those
Partnership  Agreements for IDS2 and IDS3 do  available from  unaffiliated third  parties.
not  specify  a  procedure  for  authorizing  In   addition,   the   Bylaws   specifically
transactions  with their General Partners or  authorize the  Company to  acquire  property
affiliates,  it is  possible to  amend their  from interested parties  to the extent  that
Partnership  Agreements to  authorize such a  the terms and conditions of the  acquisition
transaction  because each of the Partnership  have been  approved  by a  majority  of  the
Agreements may be amended by a majority vote  directors  not  otherwise interested  in the
of Unitholders.                               transaction (including  a  majority  of  the
                                              independent  directors)  and  such directors
                                              have made  good-faith determinations  as  to
                                              the  fairness  of the  compensation provided
                                              for such property.
</TABLE>
 
    EXCEPT FOR TRANSACTIONS SPECIFICALLY APPROVED IN THE PARTNERSHIP  AGREEMENTS
(AND  WHICH WERE DISCLOSED IN THE DISCLOSURE DOCUMENTS PREPARED FOR THE OFFERING
AND SALE  OF THE  UNITS), THE  PARTNERSHIPS  ARE NOT  AUTHORIZED TO  ENTER  INTO
TRANSACTIONS   WITH  THE  GENERAL  PARTNERS  AND  THEIR  AFFILIATES  UNLESS  THE
TRANSACTIONS ARE APPROVED IN ADVANCE BY A VOTE OF THE UNITHOLDERS. THE BYLAWS OF
THE COMPANY  CONTAIN SIMILAR  RESTRICTIONS, BUT  THE COMPANY  MAY ENTER  INTO  A
TRANSACTION  WITH ITS  DIRECTORS, OFFICERS  AND SIGNIFICANT  STOCKHOLDERS IF THE
TRANSACTION IS APPROVED  BY A MAJORITY  OF THE DIRECTORS  NOT INTERESTED IN  THE
MATTER (INCLUDING A MAJORITY OF INDEPENDENT DIRECTORS) FOLLOWING A DETERMINATION
THAT  THE  TRANSACTION IS  FAIR,  COMPETITIVE AND  COMMERCIALLY  REASONABLE. THE
BYLAWS  DO  NOT  REQUIRE  THE   APPROVAL  OF  STOCKHOLDERS  FOR  ENTERING   INTO
TRANSACTIONS WITH INTERESTED PARTIES.
 
                                       83
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                           COMPENSATION, FEES AND DISTRIBUTIONS
The   compensation  and  fees  paid  by  the  Since the  Management  Company  Merger,  the
Partnerships  relating to  the management of  Company has been internally managed. Instead
the Partnerships and their properties are as  of paying fees for management services,  the
follows:                                      Company uses its own employees to manage its
  (a) Property management fee to the Company  properties.
  equal  to 6% of gross revenues (reduced to
  5%  of  gross  revenues  from  office  and
  business  parks)  received  from operating
  the Partnership's properties;
  (b) Advertising fee to the Company at  the
  rate  of $75  per month  for each property
  (except  with   respect  to   the   office
  building owned by IDS3); and
  (c)  Reimbursements  to  the  Company  for
  certain out-of-pocket expenses incurred in
  the  management   of   the   Partnership's
  assets.
In  addition,  the General  Partner  of each
Partnership receives  5% of  cash  available
for  distribution  until the  Unitholders of
that Partnership  have  received  cumulative
distributions   equal  to  the  Unitholders'
collective  capital  contributions  plus   a
cumulative  noncompounded  return of  9% per
annum on their Adjusted Capital
Contributions, as defined in the Partnership
Agreements. Thereafter, the General  Partner
receives   20%   of   cash   available   for
distribution.
</TABLE>
 
    UNDER THE  PARTNERSHIP AGREEMENTS  AND THE  MANAGEMENT SERVICES  AGREEMENTS,
EACH  OF THE PARTNERSHIPS PAYS  COMPENSATION TO ITS GENERAL  PARTNER AND FEES TO
THE COMPANY. AFTER  THE MERGERS, NO  FEES WILL BE  PAID TO THE  COMPANY AND  THE
COMPANY  WILL MANAGE THE PARTNERSHIPS'  PROPERTIES THROUGH ITS EMPLOYEES. UNLIKE
UNITHOLDERS,  STOCKHOLDERS  REALIZE  CERTAIN   EFFICIENCIES  ARISING  FROM   THE
COMPANY'S  SELF-MANAGED  STRUCTURE  AND  THE  COMPANY  CAN  EXPAND  ITS PROPERTY
HOLDINGS  WITHOUT  A  PROPORTIONATE  INCREASE  IN  THE  COST  OF  MANAGING   THE
PROPERTIES, WHICH RESULTS WHEN PROPERTIES ARE MANAGED BY AN OUTSIDE ADVISOR.
 
                                       84
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                          MANAGEMENT CONTROL AND RESPONSIBILITY
Under  each  of the  Partnership Agreements,  The Board of Directors has exclusive control
the General Partners are, subject to certain  over  the  Company's  business  and  affairs
narrow    limitations,   vested   with   all  subject only  to  the  restrictions  in  the
management authority to conduct the business  Certificate of Incorporation and the Bylaws.
of  the Partnership, including authority and  Stockholders have the right to elect members
responsibility for overseeing all executive,  of the Board of Directors. The directors are
supervisory  and   administrative   services  accountable  to  the Company  as fiduciaries
rendered to  the  Partnership.  The  General  and  are required to exercise good faith and
Partners have the right to continue to serve  integrity  in   conducting   the   Company's
in  such  capacities  unless  removed  by  a  affairs. See "Fiduciary Responsibility."
majority   vote    of    the    Unitholders.
Unitholders  have no right to participate in
the   management   and   control   of    the
Partnership and have no voice in its affairs
except  for certain limited matters that may
be submitted to  a vote  of the  Unitholders
under   the   terms   of   the   Partnership
Agreements.  See  "--  Voting  Rights."  The
General    Partners   are   accountable   as
fiduciaries  to  the  Partnership  and   are
required   to   exercise   good   faith  and
integrity in  their dealings  in  conducting
the  Partnership's  affairs.  See "Fiduciary
Responsibility."
</TABLE>
 
    THE MEMBERS OF THE COMPANY'S BOARD  OF DIRECTORS ARE ELECTED FOR  THREE-YEAR
TERMS,  WITH A PORTION OF THE BOARD  OF DIRECTORS ELECTED AT EACH ANNUAL MEETING
OF STOCKHOLDERS.  THE GENERAL  PARTNERS DO  NOT NEED  TO SEEK  RE-ELECTION,  BUT
INSTEAD  SERVE UNLESS  REMOVED BY  AN AFFIRMATIVE  VOTE OF  UNITHOLDERS OWNING A
MAJORITY OF  THE UNITS  ENTITLED TO  VOTE. STOCKHOLDERS,  LIKE UNITHOLDERS,  ARE
PASSIVE  INVESTORS AND MUST RELY UPON  MANAGEMENT FOR THE PRUDENT ADMINISTRATION
OF THEIR INVESTMENTS.
 
                                       85
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                         MANAGEMENT LIABILITY AND INDEMNIFICATION
As  a  matter  of  state  law,  the  General  The  Company's directors  are not personally
Partners have liability  for the payment  of  liable   for  ordinary  liabilities  of  the
Partnership obligations  and  debts,  unless  Company.  The  Certificate  of Incorporation
limitations   upon   such   liability    are  provides  that  a  director's  liability for
expressly stated in the obligation. Each  of  breach  of fiduciary duty  is limited to the
the  Partnership  Agreements  provides  that  full  extent  allowable under  Delaware law.
neither General  Partners  nor  any  of  the  The  Bylaws  and  state  laws  provide broad
affiliates performing services on behalf  of  indemnification   rights  to  directors  and
the  Partnership  will  be  liable  to   the  officers  who act  in good  faith, and  in a
Partnership or its  Unitholders for any  act  manner  reasonably believed to  be in or not
or omission performed in good faith pursuant  opposed to the best interests of the Company
to  authority  granted  by  the  Partnership  and,  with  respect to  criminal  actions or
Agreement,  and  in   a  manner   reasonably  proceedings,   who  act  without  reasonable
believed to be within the scope of authority  cause to believe their conduct was unlawful.
granted and  in the  best interests  of  the  In  addition, the Bylaws indemnify directors
Partnership,  provided  that  such  act   or  and   officers   against  amounts   paid  in
omission   did    not   constitute    fraud,  settlement, authorize the Company to advance
misconduct,  bad  faith  or  negligence.  In  expenses  incurred  in  defense,  upon   the
addition,    the    Partnership   Agreements  Company's   receipt   of   an    appropriate
indemnify  the  General  Partners  and their  undertaking  to   repay  such   amounts   if
affiliates   for  liability,  loss,  damage,  appropriate, and  authorize the  Company  to
costs  and  expenses,  including  attorneys'  carry  insurance  for  the  benefit  of  its
fees,  incurred  by them  in  conducting the  officers and directors  even for matters  as
Partnerships'  business, except  in the case  to which such  persons are  not entitled  to
of   fraud,   misconduct,   bad   faith   or  indemnification. See "Fiduciary
negligence.                                   Responsibility." In the Mergers, the Company
                                              will be assuming all existing and contingent
                                              liabilities of  the Partnerships,  including
                                              their  obligations to  indemnify the General
                                              Partners.
</TABLE>
 
    THE  GENERAL  PARTNER  OF   EACH  OF  THE   PARTNERSHIPS  HAS,  UNDER   MOST
CIRCUMSTANCES,  NO  LIABILITY  TO  ITS  PARTNERSHIP  FOR  ACTS  OR  OMISSIONS IT
UNDERTAKES WHEN PERFORMED IN GOOD FAITH,  IN A MANNER REASONABLY BELIEVED TO  BE
WITHIN  THE SCOPE OF ITS AUTHORITY AND IN THE BEST INTERESTS OF THE PARTNERSHIP.
EACH GENERAL PARTNER  ALSO HAS,  UNDER SPECIFIED  CIRCUMSTANCES, A  RIGHT TO  BE
REIMBURSED BY ITS PARTNERSHIP FOR LIABILITY, LOSS, DAMAGE, COSTS AND EXPENSES IT
INCURS  BY  VIRTUE OF  SERVING AS  GENERAL PARTNER.  ALTHOUGH THE  STANDARDS ARE
EXPRESSED SOMEWHAT  DIFFERENTLY, THERE  ARE SIMILAR  PROTECTIONS FROM  LIABILITY
AVAILABLE  TO DIRECTORS AND OFFICERS OF THE COMPANY WHEN ACTING ON BEHALF OF THE
COMPANY AND RIGHTS OF  DIRECTORS AND OFFICERS TO  SEEK INDEMNIFICATION FROM  THE
COMPANY.   THE  COMPANY   BELIEVES  THAT   THE  SCOPE   OF  THE   LIABILITY  AND
INDEMNIFICATION  PROVISIONS  IN  THE  COMPANY'S  GOVERNING  DOCUMENTS   PROVIDES
PROTECTION AGAINST CLAIMS FOR PERSONAL LIABILITY AGAINST THE COMPANY'S DIRECTORS
AND  OFFICERS WHICH IS COMPARABLE TO, THOUGH NOT IDENTICAL WITH, THE PROTECTIONS
AFFORDED TO  THE GENERAL  PARTNERS AND  THEIR AFFILIATES  UNDER THE  PARTNERSHIP
AGREEMENTS. IN THE MERGERS, THE COMPANY WILL BE ASSUMING ALL OF THE EXISTING AND
CONTINGENT  LIABILITIES  OF  THE PARTNERSHIPS,  INCLUDING  THEIR  OBLIGATIONS TO
INDEMNIFY THE GENERAL PARTNERS.
 
                                       86
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                 ANTITAKEOVER PROVISIONS
Changes in management  can be effected  only  The  Certificate of Incorporation and Bylaws
by removal  of the  General Partners,  which  contain  a number  of provisions  that might
action   requires   a   majority   vote   of  have  the effect of delaying or discouraging
Unitholders. Due to transfer restrictions in  a hostile  takeover  of the  Company.  These
the   Partnership  Agreements,  the  General  provisions  include,   among   others,   the
Partners may restrict transfers of the Units  following:
and,   in  particular,  affect  whether  the  (a) the power of  the Board of Directors  to
transferees  have voting rights. An assignee    issue  40,000,000   shares  of   Preferred
of  a  Unit  may  not  become  a  substitute    Stock, with such rights and preferences as
Unitholder, entitling him or her to vote  on    determined  by  the  Board  of  Directors;
matters  that  may   be  submitted  to   the    (b) the power of the Board of Directors to
Unitholders   for   approval,   unless  such    stop  transfer  and/or  redeem  shares  of
substitution  is consented to by the General    Common   Stock    under   the    following
Partners,  which  consent,  in  the  General    conditions: from any stockholder who owns,
Partners'  absolute   discretion,   may   be    directly  or indirectly,  9.8% or  more of
withheld. The General Partners may  exercise    the  outstanding  Common  Stock,  from any
this right of  approval to  deter, delay  or    five   or  fewer   stockholders  who  own,
hamper attempts  by  persons  to  acquire  a    directly  or indirectly, more  than 50% of
majority interest of the Unitholders.           the outstanding Common Stock, or from  any
                                                other   stockholder   if   the   Board  of
                                                Directors  otherwise  determines  in  good
                                                faith  that  ownership of  the outstanding
                                                Common   Stock   has    or   may    become
                                                concentrated to an extent that may prevent
                                                the  Company  from  qualifying  as  a REIT
                                                under   the   Code.   Any   Common   Stock
                                                transferred    in   violation    of   this
                                                restriction becomes  "Excess Stock,"  with
                                                no  voting  or  distribution  rights.  The
                                                Company  has  the  power  to  purchase  or
                                                direct the sale of such Excess Stock, with
                                                the sale proceeds being paid to the former
                                                owner; and
                                                (c)  the  classified  Board  of Directors,
                                                wherein only  one-third of  directors  are
                                                re-elected  to the Board in any given year
                                                and  directors  serve  three-year   terms.
                                              In  addition, the Company  has a Stockholder
                                              Rights Plan.  See  "Description  of  Capital
                                              Stock  --  Common Stock  and Class  B Common
                                              Stock   --    Stockholder   Rights    Plan."
</TABLE>
 
    CERTAIN  PROVISIONS OF THE  GOVERNING DOCUMENTS OF  THE PARTNERSHIPS AND THE
COMPANY COULD BE USED  TO DETER ATTEMPTS TO  OBTAIN CONTROL OF THE  PARTNERSHIPS
AND  THE COMPANY IN  TRANSACTIONS NOT APPROVED  BY THE GENERAL  PARTNERS AND THE
BOARD  OF  DIRECTORS,   RESPECTIVELY.  BECAUSE  THE   COMMON  STOCK  IS   FREELY
TRANSFERABLE  AND THE COMPANY'S DIRECTORS ARE ELECTED BY THE STOCKHOLDERS, THERE
IS A GREATER LIKELIHOOD OF  CHANGES IN CONTROL IN THE  CASE OF THE COMPANY  THAN
THE PARTNERSHIPS, NOTWITHSTANDING THOSE PROVISIONS DESCRIBED ABOVE.
 
                                       87
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                      VOTING RIGHTS
Unitholders  by a majority vote may, without  The Company's Board of Directors consists of
the concurrence  of  the  General  Partners,  three  classes. Stockholders are entitled to
amend the  Partnership  Agreement,  dissolve  elect  one class  of the  Company's Board of
the  Partnership,  remove  and/or  elect   a  Directors  at  each  annual  meeting  of the
General Partner, and  approve or  disapprove  Company.  The  Certificate  of Incorporation
the sale of all or substantially all of  the  and   the  Bylaws   grant  stockholders  the
Partnership's assets.  Unitholders  may  not  non-exclusive right, without approval of the
exercise these rights in a way to extend the  Board of Directors, to amend the Certificate
term   of   the   Partnership,   change  the  of Incorporation or the Bylaws, dissolve the
Partnership to a general partnership, change  Company, vote to remove members of the Board
the limited liability of the Unitholders  or  of  Directors, and approve or disapprove the
affect the  status  of the  Partnership  for  sale  of substantially all  of the Company's
federal income tax purposes.                  assets. In addition,  certain other  actions
                                              may  not be taken by  the Board of Directors
                                              without the approval of  a majority vote  of
                                              stockholders, including:
                                              (a) amending the Certificate of
                                              Incorporation;
                                                (b)   amending   certain   of   the  Bylaw
                                                provisions;
                                                (c)  merging  the  Company  with  or  into
                                                another corporation, unless the Company is
                                                the  surviving  entity  and  certain other
                                                conditions are met;
                                                (d) selling  all or  substantially all  of
                                                the Company's assets; and
                                                (e) dissolving the Company.
</TABLE>
 
    STOCKHOLDERS  HAVE  DIFFERENT VOTING  RIGHTS, INCLUDING  THE RIGHT  TO ELECT
DIRECTORS ON A PERIODIC BASIS, THAN THE VOTING RIGHTS AFFORDED TO UNITHOLDERS.
 
<TABLE>
<S>                                           <C>
                              LIMITED LIABILITY OF INVESTORS
Under each of the Partnership Agreements and  Under Delaware law, stockholders will not be
applicable  state  law,  the  liability   of  liable for Company debts or obligations. The
Unitholders  for the Partnership's debts and  Shares, upon  issuance, will  be fully  paid
obligations  is  limited  to  the  amount of  and nonassessable.
their   investment   in   the   Partnership,
together  with an  interest in undistributed
income, if any. The Units are fully paid and
nonassessable.
</TABLE>
 
    THE LIMITATION  ON PERSONAL  LIABILITY  OF STOCKHOLDERS  OF THE  COMPANY  IS
SUBSTANTIALLY THE SAME AS THAT OF UNITHOLDERS IN THE PARTNERSHIPS.
 
                                       88
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                                 REVIEW OF INVESTOR LISTS
Unitholders  of each of the Partnerships are  A  stockholder  is  entitled,  upon  written
entitled to request copies of investor lists  demand,  to inspect  and copy  the Company's
showing  the  names  and  addresses  of  all  stock  records  at  any  time  during  usual
Unitholders of the Partnership. The right to  business  hours  for  a  purpose  reasonably
receive  such investor  lists is conditioned  related  to  his  or   her  interest  as   a
upon the Unitholder's payment of the cost of  stockholder.
duplication and mailing.
</TABLE>
 
    UNITHOLDERS AND STOCKHOLDERS ARE ENTITLED TO ACCESS TO INVESTOR LISTS AND TO
STOCK RECORDS, RESPECTIVELY, SUBJECT TO CERTAIN REQUIREMENTS.
 
<TABLE>
<S>                                           <C>
                                        LIQUIDITY
The  Units  may not  be transferred  if such  The Common Stock is freely transferable  and
transfers would result in the termination of  listed on the NYSE. See "Risk Factors."
the  Partnership  under Section  708  of the
Code or cause  the Partnership  to lose  its
classification   as   a   "partnership"  for
federal income tax purposes. In addition, no
transferee of a Unit has the right to become
a  substitute  Unitholder  (entitling   such
person  to  vote on  matters submitted  to a
vote of the Unitholders) unless, among other
things, such substitution is approved by the
General Partners, who may grant or  withhold
such  consent in  their absolute discretion.
In view  of the  foregoing restrictions,  it
was  never intended that  the Units would be
actively   traded,   and   no    broad-based
secondary market for the Units exists.
</TABLE>
 
    THE  UNITS  CONSTITUTE  ILLIQUID  INVESTMENTS AND  UNITHOLDERS  MAY  FIND IT
DIFFICULT TO DISPOSE OF THEIR UNITS, IF THEY WISH TO DO SO, OR MAY BE  OBLIGATED
TO SELL THE UNITS AT SUBSTANTIAL DISCOUNTS TO FACILITATE THE SALES. IN CONTRAST,
THE COMMON STOCK IS LISTED ON THE NYSE.
 
                                       89
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                              TAXATION OF TAXABLE INVESTORS
Income   or  loss  earned  by  each  of  the  Because the Company qualifies as a REIT, the
Partnerships is not taxed at the partnership  Company generally  is  permitted  to  deduct
level.  Unitholders  are required  to report  distributions  to  its  stockholders,  which
their  allocable share of Partnership income  effectively  reduces   or   eliminates   the
and  loss on  their respective  tax returns.  "double  taxation"  (at  the  corporate  and
Income   and   loss  from   the  Partnership  stockholder levels)  that typically  results
generally  constitute  "passive"  income and  when  a   corporation   earns   income   and
loss,  which can  generally offset "passive"  distributes that income  to stockholders  in
income  and loss from other investments. Due  the form  of  dividends.  Stockholders  will
to  depreciation  and  other  noncash items,  recognize income on Company distributions to
cash   distributions   are   not   generally  the   extent  of   current  and  accumulated
equivalent to the income and loss  allocated  earnings   and   profits  of   the  Company.
to Unitholders. During operations, such cash  Distributions in excess of such earnings and
distributions are  partially sheltered  but,  profits  are taxable to  stockholders to the
if the  properties  retain  their  value  or  extent   such   distributions   exceed   the
appreciate, gain  upon  liquidation  of  the  stockholder's   tax  basis  in  his  or  her
asset will  exceed  the  cash  distributions  shares.  Dividends received  by stockholders
available to Unitholders.  After the end  of  from  the Company  generally will constitute
each fiscal year, Unitholders receive annual  portfolio  income,   which   cannot   offset
schedule  K-1 forms  showing their allocable  "passive"  income   and  loss   from   other
share  of  Partnership income  and  loss for  investments. Losses  and  credits  generated
inclusion   on  their   federal  income  tax  within the Company  do not  pass through  to
returns.  Unitholders  are also  required to  the  stockholders.  Because  the  amount  of
file  state  income tax  returns  and/or pay  distributions required  to  be made  by  the
state  income taxes  in Arizona, California,  Company for purposes of maintaining its REIT
Georgia, Michigan, Oregon and Virginia.       characterization is  determined based  on  a
                                              percentage  of  taxable  income  (calculated
                                              with depreciation deductions, excluding  any
                                              net  capital gains  and prior  to payment of
                                              any dividends) the  amount of  distributions
                                              required  to be  made by the  Company may be
                                              less than  the  distributions  made  by  the
                                              Partnership.  After the end of the Company's
                                              calendar year, stockholders will receive the
                                              less  complicated  Form  1099-DIV  used   by
                                              corporations   to   report   their  dividend
                                              income. See  "Material  Federal  Income  Tax
                                              Considerations."
</TABLE>
 
    EACH  OF THE PARTNERSHIPS IS A PASS-THROUGH ENTITY, WHOSE INCOME AND LOSS IS
NOT TAXED AT  THE ENTITY  LEVEL BUT INSTEAD  ALLOCATED DIRECTLY  TO THE  GENERAL
PARTNER  AND UNITHOLDERS. UNITHOLDERS  ARE TAXED ON INCOME  OR LOSS ALLOCATED TO
THEM, WHETHER  OR  NOT  CASH  DISTRIBUTIONS ARE  MADE  TO  THE  UNITHOLDERS.  IN
CONTRAST,  THE COMPANY QUALIFIES AS A REIT, ALLOWING IT TO DEDUCT DIVIDENDS PAID
TO ITS STOCKHOLDERS. TO THE EXTENT THE COMPANY HAS NET INCOME (AFTER TAKING INTO
ACCOUNT THE DIVIDENDS PAID DEDUCTION), SUCH INCOME WILL BE TAXED AT THE  COMPANY
LEVEL  AT THE STANDARD CORPORATE TAX  RATES. DIVIDENDS PAID TO STOCKHOLDERS WILL
CONSTITUTE PORTFOLIO INCOME AND NOT PASSIVE INCOME.
 
                                       90
<PAGE>
 
<TABLE>
<CAPTION>
                PARTNERSHIP                                     COMPANY
- --------------------------------------------  --------------------------------------------
<S>                                           <C>
                             TAXATION OF TAX-EXEMPT INVESTORS
Income  or  loss  earned  by  each  of   the  The  IRS has ruled  that income attributable
Partnerships is  generally treated  as  UBTI  to   an  investment  in   a  REIT  will  not
unless the type of  income generated by  the  constitute   UBTI   to   certain  tax-exempt
Partnerships  would   constitute   qualified  investors  as long as such investor does not
rental income or other specifically excluded  hold  its  shares  subject  to   acquisition
types  of income. For  Partnership income to  indebtedness. Accordingly, dividends
be  characterized  as  rental  income,   the  received  from  the Company  by  tax- exempt
Partnerships  cannot  provide  services   to  stockholders  should not  constitute UBTI if
tenants that are considered other than those  such  stockholders  did   not  finance   the
usually    or   customarily    rendered   in  acquisition of  the  Shares. The  amount  of
connection  with  the  rental  of  rooms for  dividends paid  to  tax-exempt  stockholders
occupancy  only.  Although  the Partnerships  may be less than  the distributions made  to
have  not  obtained  a ruling  from  the IRS  such   entities   from   their    respective
addressing  the issue of  whether the income  Partnerships because of the REIT requirement
received by the  Partnerships in  connection  that  distributions be based on a percentage
with  the  leasing  of  self  storage  units  of   REIT  Taxable   Income.  See  "Material
constitutes rental  income  for  these  UBTI  Federal Income Tax Considerations."
purposes, the Company has obtained a private
ruling  from  the  IRS with  respect  to the
characterization  of  the  Company's  rental
income  taking  into  account  the  services
rendered   by   the   Company.   Based    on
representations  from  the  General Partners
that the services  rendered with respect  to
the properties owned by the Partnerships are
consistent  with those services described in
the  Company's  ruling,  the   Partnerships'
income  should  not be  treated as  UBTI for
tax-exempt  partners;  however,  this  is  a
factual issue on which the Partnerships have
received no ruling.
</TABLE>
 
    A  TAX-EXEMPT  ENTITY IS  TREATED  AS OWNING  AND  CARRYING ON  THE BUSINESS
ACTIVITY CONDUCTED  BY A  PARTNERSHIP IN  WHICH SUCH  ENTITY OWNS  AN  INTEREST.
ACCORDINGLY,  TO  THE  EXTENT  A  TAX-EXEMPT  PARTNER  OWNS  AN  INTEREST  IN  A
PARTNERSHIP, THE INCOME RECEIVED BY SUCH PARTNERSHIP MUST NOT CONSTITUTE UBTI IN
ORDER FOR THE TAX-EXEMPT PARTNER TO AVOID TAXATION. THE INCOME RECEIVED FROM THE
PARTNERSHIPS' SELF STORAGE BUSINESS  SHOULD QUALIFY AS  RENTAL INCOME FOR  THESE
PURPOSES  (THEREFORE,  NOT  UBTI).  DIVIDENDS  PAID  WITH  RESPECT  TO,  OR GAIN
RECOGNIZED ON A DISPOSITION OF, THE SHARES ARE NOT UBTI.
 
                                       91
<PAGE>
                             CONFLICTS OF INTEREST
 
    A  number of conflicts  of interest are inherent  in the relationships among
the Partnerships, the  General Partners and  the Company and  its directors  and
officers. Certain of these conflicts of interest are summarized below.
 
COMMON COMPOSITION OF GENERAL PARTNERS
 
    Although  a different limited  partnership serves as  the General Partner of
each Partnership,  the general  and  limited partners  of  each of  the  General
Partners  are  identical.  The  General  Partner  of  each  Partnership  has  an
independent obligation to  ensure that such  Partnership's participation in  the
Mergers  is fair and equitable,  without regard to whether  the Mergers are fair
and equitable to the other participants (including the other Partnerships).  See
"Fiduciary  Responsibility -- General Partners of the Partnerships." The General
Partners of the Partnerships have sought to discharge faithfully this obligation
to each  Partnership; however,  Unitholders  should consider  that each  of  the
general  and limited partners of the  General Partner of each Partnership serves
in a  similar capacity  with  respect to  the General  Partner  of each  of  the
Partnerships.  If each of  the Partnerships had a  separate General Partner with
general and limited partners who did not serve in similar capacities for any  of
the  other Partnerships, these persons would have had an independent perspective
which  might  have  led  them  to  advocate  positions  during  negotiating  and
structuring the Mergers different than those taken by the General Partners.
 
OVERLAPS BETWEEN AFFILIATES OF THE GENERAL PARTNERS AND DIRECTORS AND OFFICERS
OF THE COMPANY
 
    Charles  K. Barbo, the Chairman of  the Board, President and Chief Executive
Officer of the Company, is an individual general partner of each of the  General
Partners  and the sole  shareholder and director of  SGPI, the corporate general
partner of  each  of the  General  Partners. As  such,  he is  able  to  control
decisions  made by  the general partners  of the General  Partners. In addition,
Harrell L. Beck, Senior Vice President, Chief Financial Officer and Treasurer of
the Company,  serves  as  Treasurer  of SGPI;  Kristin  H.  Stred,  Senior  Vice
President,  General Counsel and Secretary of the Company, serves as Secretary of
SGPI; and Michael Rowe, Chief Operating  Officer of the Company, serves as  Vice
President of SGPI.
 
COMPANY OWNERSHIP OF UNITS
 
    As  of  the  date  of  this  Proxy  Statement/Prospectus,  the  Company owns
approximately  65,059  IDS1  Units   (approximately  44%),  38,766  IDS2   Units
(approximately  34%)  and 52,648  IDS3  Units (approximately  44%).  The Company
participates in  the Partnerships'  distributions  on the  same terms  as  other
Unitholders  in respect of  the Units owned  by it. The  Company intends to vote
these Units in favor of  the Mergers. No other  partner of the General  Partners
beneficially owns any Units.
 
GENERAL PARTNER'S INTEREST
 
    Pursuant  to  each of  the Partnership  Agreements,  the General  Partner is
entitled to a percentage of the Partnership's cash distributions based upon  the
amount  of distributions made to the Unitholders. Initially, the General Partner
receives 5% of all Partnership distributions until such time as the  Unitholders
have  received a cumulative  amount of Partnership  distributions equal to their
collective capital contributions  plus a cumulative  noncompounded return of  9%
per  annum on their adjusted capital contributions (such cumulative amount being
referred to  as  the  "Unitholders'  Preference").  Once  the  Unitholders  have
received  distributions  equal  to their  Unitholders'  Preference,  the General
Partner receives 20% of all further cash  distributions. As of the date of  this
Proxy  Statement/ Prospectus, the Unitholders have not received Partnership cash
distributions equal to the
 
                                       92
<PAGE>
Unitholders' Preference for  any of the  Partnerships. Accordingly, the  General
Partners  have been  limited to receiving  5% of  Partnership cash distributions
resulting in the receipt of the following distributions by the General  Partners
for the periods indicated.
 
<TABLE>
<CAPTION>
                                                                                 SIX MONTHS
                                                YEAR ENDED DECEMBER 31,             ENDED
                                         -------------------------------------    JUNE 30,
PARTNERSHIP                                 1993         1994         1995          1996
- ---------------------------------------  -----------  -----------  -----------  -------------
<S>                                      <C>          <C>          <C>          <C>
IDS1...................................  $   118,200  $   132,800  $   149,900   $    75,600
IDS2...................................       94,700       95,600       98,400        49,200
IDS3...................................       96,100      111,800      117,600        58,800
</TABLE>
 
    The  Company  (or  its predecessor)  and  IPSC  each received  40%  of these
amounts. Messrs. Barbo  and Buerk each  received 9.9% and  SGPI received .2%  of
these amounts in accordance with the applicable GP Agreement.
 
    The  General Partners' percentage interest  in the Merger Consideration will
be based upon the above  distribution principles. As of  the date of this  Proxy
Statement/Prospectus,  the Net Asset Value  of IDS1 and IDS2  is not expected to
exceed the amount of its undistributed Unitholders' Preference. Accordingly, the
IDS1 General Partner and the IDS2 General Partner will only be entitled to 5% of
the Merger  Consideration paid  for those  Partnerships. With  respect to  IDS3,
however,  the Net Asset Value initially  allocable to Unitholders is expected to
exceed  an   amount  equal   to  its   undistributed  Unitholders'   Preference.
Accordingly,  the Unitholders  will be  treated as  receiving their Unitholders'
Preference and the IDS3 General Partner will be entitled to share in 20% of some
part, but not all,  of the Merger Consideration,  resulting in the IDS3  General
Partner  receiving 7.5%  of the Merger  Consideration with respect  to IDS3. See
"Fairness  of  the  Mergers  --  Determination  of  Merger  Consideration"   for
additional  information regarding the portion of  the Net Asset Values allocated
to the General Partners and upon  which the Merger Consideration to be  received
by  the General Partners will be based.  After the Mergers, the General Partners
and their affiliates will  be entitled to receive  dividends on the Shares  they
receive  in  the Mergers  on the  same basis  as all  other stockholders  of the
Company, including Unitholders.
 
    Upon consummation of the Mergers and assuming the Share Price is within  the
Share  Price Range, the  General Partners will receive  shares with an aggregate
value of approximately $6,307,000, of which the Company, IPSC, Charles K.  Barbo
and  Arthur  W.  Buerk  will be  entitled  to  receive Shares  with  a  value of
approximately  $1,300,000,  $2,653,300,  $538,300  and  $527,600,  respectively.
Pursuant  to the Contingent Shares Agreement,  certain of the Shares received by
the Company in  the Mergers  for its  limited partner  interest in  each of  the
General  Partners  will be  remitted to  former  stockholders of  the Management
Company, which include Messrs. Barbo and Buerk and the executive officers of the
Company. See "-- Contingent Shares Agreement."
 
MANAGEMENT AGREEMENTS
 
    The  Partnerships'  properties  are  managed  by  the  Company  pursuant  to
Management  Services Agreements under which the Company, as compensation for its
management services, receives a  monthly fee of 6%  of gross revenues from  self
storage properties (5% of revenues from office and business parks), plus $75 per
month per self storage property for rendering advertising services. In addition,
the  Company is reimbursed at  cost by the Partnerships  for certain expenses it
incurs as property manager. For the years ended December 31, 1993, 1994 and 1995
and the six months ended
 
                                       93
<PAGE>
June 30, 1996, the  Company (or the Management  Company prior to the  Management
Company  Merger) received  the following amounts  in payment  for these property
management and advertising fees:
 
<TABLE>
<CAPTION>
                                                                                   SIX MONTHS
                                                   YEAR ENDED DECEMBER 31,            ENDED
                                            -------------------------------------   JUNE 30,
PARTNERSHIP                                    1993         1994         1995         1996
- ------------------------------------------  -----------  -----------  -----------  -----------
<S>                                         <C>          <C>          <C>          <C>
IDS1......................................  $   310,100  $   337,800  $   361,800  $   183,300
IDS2......................................      224,300      249,500      265,500      138,700
IDS3......................................      256,900      407,800      447,700      226,700
</TABLE>
 
    If a Merger is consummated, all of the assets of the merged Partnership will
be acquired by the  Company and, because the  Company is self-administered,  the
acquired  assets will  be managed  by employees of  the Company  and the General
Partner and its affiliates  will receive no  property management or  advertising
fees from the merged Partnership.
 
    Pursuant  to an agreement executed in connection with the Consolidation, the
Company paid an affiliate of  IPSC a quarterly fee  of $12,000 for each  quarter
commencing  July  1, 1994  and ending  June  30, 1996  for expenses  incurred in
rendering certain administrative services. The  Company will reimburse the  IPSC
affiliate  for  its expenses  incurred for  administrative services  provided in
connection with the Offers and Mergers.  The IPSC affiliate estimates that  such
expenses will not exceed $50,000.
 
OWNERSHIP OF COMPANY COMMON STOCK BY AFFILIATES OF THE GENERAL PARTNERS
 
    Charles K. Barbo and Arthur W. Buerk, individual general partners of each of
the General Partners, are also stockholders of the Company. As of June 30, 1996,
Messrs.   Barbo  and   Buerk  beneficially   owned  approximately   3%  and  2%,
respectively, of the Company's outstanding Common Stock.
 
CONTINGENT SHARES AGREEMENT
 
    In connection with the Management Company Merger, the Company and the former
shareholders of the  Management Company executed  a Contingent Shares  Agreement
dated  as  of March  24, 1995  (the "Contingent  Shares Agreement")  whereby the
former Management Company shareholders are entitled to receive shares of  Common
Stock  upon the sale or  transfer of, or the  occurrence of certain other events
with respect  to,  the  Company's  interests  in  certain  limited  partnerships
formerly  owned  by  the  Management Company,  including  the  Partnerships. The
Company entered  into  the  Contingent  Shares  Agreement  because  the  Company
concluded  that it was difficult at the time of the Management Company Merger to
value  the  Management  Company's  interests  in  certain  limited  partnerships
(including  the Partnerships). Accordingly,  the Management Company shareholders
did not receive  full value with  respect to such  interest at the  time of  the
Management  Company  Merger,  but  instead are  entitled  to  receive additional
consideration at a future valuation date  or when the Company receives  proceeds
from  the sale of  these interests. Pursuant to  the Contingent Shares Agreement
and assuming the Share Price is within the Share Price Range, Messrs. Barbo  and
Buerk  and the executive officers of the  Company, as former stockholders of the
Management Company, will receive Shares upon consummation of the Mergers with  a
value of approximately $475,600, $289,400 and $77,900, respectively.
 
COMPARISON OF PRE- AND POST-MERGER COMPENSATION AND DISTRIBUTIONS TO GENERAL
PARTNERS AND AFFILIATES
 
    PRE-MERGER  COMPENSATION AND DISTRIBUTIONS.  Currently, the General Partners
and their  affiliates are  entitled to  receive the  following compensation  and
distributions from the Partnerships:
 
        (a)  The General Partners receive cash distributions on account of their
    general partner interest in a Partnership (the amounts of such distributions
    during each Partnership's three most recent fiscal years and the six  months
    ended June 30, 1996 are set forth above in "General Partner's Interest").
 
                                       94
<PAGE>
        (b)  The Company receives property  management fees and advertising fees
    pursuant to the terms of the Management Services Agreements (the amounts  of
    such  fees paid to the Company and its predecessor during each Partnership's
    three most recent fiscal years  and the six months  ended June 30, 1996  are
    set forth above in "Management Agreements").
 
        (c)  The  Company  receives  reimbursements for  expenses  it  incurs in
    managing  the  Partnerships  and  their  properties.  The  amounts  of  such
    reimbursement   paid  to  the   Company  and  its   predecessor  during  the
    Partnerships' three most recent fiscal years  and the six months ended  June
    30, 1996 are set forth below:
 
<TABLE>
<CAPTION>
                                                 YEAR ENDED DECEMBER 31,        SIX MONTHS
                                            ---------------------------------   ENDED JUNE
PARTNERSHIP                                   1993        1994        1995       30, 1996
- ------------------------------------------  ---------  -----------  ---------  -------------
<S>                                         <C>        <C>          <C>        <C>
IDS1......................................  $  66,900  $   108,900  $  65,100   $    33,600
IDS2......................................     76,500       57,600     54,700        27,800
IDS3......................................     52,300      111,900     78,500        36,600
</TABLE>
 
    POST-MERGER  COMPENSATION  AND DIVIDENDS.   After  the Mergers,  the General
Partners and  their  affiliates  will  be  entitled  to  receive  the  following
compensation and dividends from the Company:
 
        (a)  Assuming  a Share  Price  of $25,  the  General Partners  and their
    affiliates, through the  Mergers, will  receive a total  of 252,288  Shares,
    including   Shares  received  under  the  Contingent  Shares  Agreement,  as
    described  above.  After  the  Mergers,  the  General  Partners  and   their
    affiliates  will  be entitled  to receive  dividends  with respect  to those
    Shares on the same  basis as all other  stockholders of the Company,  unlike
    the  Partnerships, where  the General Partners  were entitled  to receive an
    increased  percentage   of  the   Partnerships'  distributions   after   the
    Unitholders  had received  a specified priority  return. The  amount of such
    dividends will  depend  upon,  among  other  things,  the  Company's  future
    performance.  If the  Mergers had  occurred on  January 1,  1993, during the
    succeeding periods, the  General Partners  and their  affiliates would  have
    received  the dividends set forth  in the table below  with respect to those
    Shares.
 
        (b) An  affiliate of  IPSC will  be reimbursed  by the  Company for  its
    expenses  incurred in  connection with certain  administrative services. The
    affiliate estimates that such expenses will not exceed $50,000.
 
        (c) The executive officers of  the Company, including Charles K.  Barbo,
    will  continue to receive  compensation from the Company  by virtue of their
    employment by the Company.
 
    The table  below  compares  (a)  the  total  actual  cash  compensation  and
distributions  received by the General Partners  and their affiliates during the
Partnerships' three most recent fiscal years  and the six months ended June  30,
1996  with (b) the  total cash compensation  and dividends that  would have been
received by  the General  Partners and  their affiliates  during the  same  time
period  if the post-Merger  compensation and distribution  structure had been in
effect during that period:
 
<TABLE>
<CAPTION>
                                                                  YEAR ENDED DECEMBER 31,             SIX MONTHS
                                                        -------------------------------------------   ENDED JUNE
                                                            1993           1994           1995         30, 1996
                                                        -------------  -------------  -------------  -------------
<S>                                                     <C>            <C>            <C>            <C>
Partnerships
  Management/Advertising Fees.........................  $     791,300  $     995,100  $   1,075,000   $   548,700
  Expense reimbursements..............................        195,700        278,400        198,300        98,000
  Distributions.......................................        309,200        340,200        365,900       183,600
                                                        -------------  -------------  -------------  -------------
                                                        $   1,296,000  $   1,613,700  $   1,639,200   $   830,300
                                                        -------------  -------------  -------------  -------------
                                                        -------------  -------------  -------------  -------------
Company (1)
  Distributions (2)...................................  $     365,700  $     402,700  $     433,100   $   217,300
  Administrative Services Reimbursement...............         50,000              0              0             0
  Salary and Bonus (3)................................        600,340        647,000        692,000       435,000
                                                        -------------  -------------  -------------  -------------
                                                        $   1,016,040  $   1,049,700  $   1,125,100   $   652,300
                                                        -------------  -------------  -------------  -------------
                                                        -------------  -------------  -------------  -------------
</TABLE>
 
- ------------------------
(1) Assumes that the Management Company Merger occurred as of January 1, 1993.
 
                                       95
<PAGE>
 
(2) Assumes actual aggregate distributions made by the Partnerships during  each
    period were distributed to the Unitholders and the General Partners pro rata
    based on the number of Shares they received in the Mergers.
 
(3)  Actual  salary and  bonus paid  by the  Company or  its predecessor  to the
    current executive officers  of the  Company for the  indicated time  period,
    except  for  bonus for  the  six months  ended  June 30,  1996  which equals
    one-half of the targeted 1996 bonus.
 
ABSENCE OF INDEPENDENT SOLICITING AGENT; INDEMNIFICATION
 
    SRA,   the    Soliciting   Agent    in    connection   with    this    Proxy
Statement/Prospectus,  is  wholly  owned by  Charles  K. Barbo.  Mr.  Barbo, the
Chairman of the Board, President and Chief Executive Officer of the Company,  is
an  individual general  partner of  each of  the General  Partners and  the sole
stockholder and director of SGPI, the  corporate general partner of each of  the
General Partners.
 
    Because  of federal  and state  securities laws,  underwriters of securities
offered to the public may be expected to take such steps as may be necessary  to
satisfy  themselves that the information contained in the prospectus pursuant to
which the  securities are  offered is  accurate and  complete. These  steps  are
typically  taken by a "lead underwriter"  or "dealer manager" which participates
in the preparation of the prospectus. Because SRA is affiliated with the General
Partners and the Company, the review  and investigation of the Partnerships  and
the   Company   by   SRA   and   the   information   provided   in   this  Proxy
Statement/Prospectus will not have the benefit of, and may not be as  meaningful
as,  a review and investigation by an independent dealer manager. Investors must
rely on the General Partners and the Company regarding the information contained
in this Proxy  Statement/ Prospectus.  In addition,  the Company  has agreed  to
indemnify  SRA against certain liabilities to which SRA may become subject under
the federal and state securities laws.
 
                            FIDUCIARY RESPONSIBILITY
 
DIRECTORS AND OFFICERS OF THE COMPANY
 
    The directors  of  the  Company  are accountable  to  the  Company  and  its
stockholders  as fiduciaries and must  perform their duties in  good faith, in a
manner they  believe  to  be in  the  best  interests of  the  Company  and  its
stockholders  and with such care, including reasonable inquiry, as an ordinarily
prudent person in  a like position  would use under  similar circumstances.  The
Certificate  of Incorporation provides that the directors will not be personally
liable to the Company or to any stockholder  of the Company for the breach of  a
fiduciary responsibility, to the full extent that such limitation or elimination
of  liability is permitted under Delaware  law. The Certificate of Incorporation
and Bylaws provide that the Company will indemnify its directors and officers to
the full  extent  permitted under  Delaware  law.  Pursuant to  the  Bylaws  and
Delaware  law, the Company will indemnify  each director and officer against any
liability  and  related  expenses   (including  attorneys'  fees)  incurred   in
connection  with any proceeding in which he or  she may be involved by reason of
serving in such capacity so long as the director or officer acted in good  faith
and  in a manner he  or she reasonably believed  to be in or  not opposed to the
best interests  of the  Company, and,  with respect  to any  criminal action  or
proceeding,  had no reasonable cause to believe his or her conduct was unlawful.
A director  and officer  is also  entitled to  indemnification against  expenses
incurred  in any action or suit  by or in the right  of the Company to procure a
judgment in its favor by reason of serving  in such capacity if he or she  acted
in good faith and in a manner reasonably believed to be in or not opposed to the
best  interests of the Company, except that no such indemnification will be made
if the director or  officer is judged  to be liable to  the Company, unless  the
applicable  court of law  determines that despite  the adjudication of liability
the director  or officer  is  reasonably entitled  to indemnification  for  such
expenses.  The Bylaws authorize  the Company to  advance funds to  a director or
officer for costs and expenses (including attorneys' fees) incurred in a suit or
proceeding upon receipt of an undertaking  by such director or officer to  repay
such amounts if it is ultimately determined that he or she is not entitled to be
indemnified.  Stockholders may have  more limited recourse  against such persons
than would apply
 
                                       96
<PAGE>
absent these provisions. To the extent that the foregoing provisions  concerning
indemnification  apply to actions arising under  the Securities Act, the Company
has been advised  that, in the  opinion of the  Commission, such provisions  are
contrary to public policy and therefore are not enforceable.
 
GENERAL PARTNERS OF THE PARTNERSHIPS
 
    Under  Washington partnership law,  the General Partners  are accountable to
the Partnerships as  fiduciaries and  are required  to exercise  good faith  and
integrity  in all their  dealings in the  Partnerships' affairs. The Partnership
Agreements generally provide that neither the General Partners nor any of  their
affiliates  performing services on behalf of  the Partnerships will be liable to
the Partnerships or any of the Unitholders  for any act or omission by any  such
person  performed in good faith pursuant to the authority granted to such person
by the Partnership Agreements,  or in accordance with  its provisions, and in  a
manner  reasonably believed by such  person to be within  the scope of authority
granted to such person and in  the best interests of the Partnerships,  provided
that  such act or  omission did not  constitute fraud, misconduct,  bad faith or
negligence. As a result, Unitholders might  have a more limited right of  action
in certain circumstances than they would have in the absence of such a provision
in the Partnership Agreements.
 
    The  Partnership Agreements also generally provide that the General Partners
and their  affiliates performing  services  on behalf  of the  Partnerships  are
indemnified  from  losses  incurred  by  them  on  behalf  of  their  respective
Partnership or  in furtherance  of the  Partnership's interests  (except to  the
extent   indemnification  is  prohibited  by  law)  provided  that  such  person
determined in good faith that the course of conduct was in the best interests of
the Partnership  and  provided  further  that the  course  of  conduct  did  not
constitute  fraud,  negligence, bad  faith or  misconduct.  For purposes  of the
foregoing, the affiliates of the General Partners will be indemnified only  when
operating  within the scope of the General Partner's authority and, for IDS2 and
IDS3, when performing services  on behalf of  their respective Partnership.  Any
claim  for indemnification  under the  Partnership Agreements  will be satisfied
only out of the assets of the applicable Partnership and no Unitholder will have
any personal  liability to  satisfy an  indemnification claim  made against  its
Partnership.
 
    Notwithstanding  the  foregoing,  neither  the  above-mentioned  persons nor
certain related parties  are to  be indemnified  by the  Partnerships from  loss
incurred  by such person in connection with any claim involving allegations that
such person violated federal or state securities laws unless (i) there has  been
a  successful  adjudication  on  the  merits  of  each  count  involving alleged
securities law violations as to the person seeking indemnification and the court
approves indemnification of  the litigation  costs, (ii) such  claims have  been
dismissed  with prejudice on the merits by a court of competent jurisdiction and
the court approves indemnification of the  litigation costs or (iii) a court  of
competent  jurisdiction  has approved  a settlement  of  the claims  against the
person seeking indemnification and finds that indemnification of the  settlement
and related costs should be made. In each of the foregoing situations, the court
of  law considering the  request for indemnification  must be advised  as to the
position of the Commission, certain state agencies specified in the  Partnership
Agreement    and   any   other   applicable   regulatory   authority   regarding
indemnification for violations  of securities laws.  Indemnification may not  be
enforceable  as to certain liabilities arising  from claims under the Securities
Act and state securities laws. In the opinion of the Commission, indemnification
from  these  liabilities  is  contrary   to  public  policy  and  is   therefore
unenforceable.
 
    The  Partnerships may also  advance funds to a  person indemnified under the
Partnership Agreements for legal expenses and  other costs incurred as a  result
of legal action brought against such person only if (i) the legal action relates
to  the  performance of  duties  or services  by such  person  on behalf  of the
Partnership, (ii)  the  legal  action is  initiated  by  a party  other  than  a
Unitholder  and (iii) such person undertakes to  repay the advanced funds to the
Partnership if it is subsequently determined that such person is not entitled to
indemnification  pursuant  to  the  terms  of  the  Partnership  Agreement.  Any
indemnification  required by  the Partnership  Agreements will  be made promptly
following the  fixing  of  the liability  by  a  final judgment  of  any  court,
settlement, contract or otherwise. The Partnerships do not pay for any insurance
covering liability of the General Partners or any other
 
                                       97
<PAGE>
indemnified  person  for  acts or  omissions  for which  indemnification  is not
permitted by the Partnership Agreements,  although the General Partners and  any
other  indemnified person may be named as additional insured parties on policies
obtained for the benefit of a Partnership if there is no additional cost to  the
Partnership.  As  part of  its  assumption of  liabilities  in the  Mergers, the
Company will indemnify the General Partners  and their affiliates to the  extent
of  the indemnity under  the terms of the  Partnership Agreements and applicable
law.
 
                  BUSINESS AND PROPERTIES OF THE PARTNERSHIPS
 
GENERAL
 
    Each Partnership was  formed for  the purpose of  acquiring, developing  and
operating  self storage centers and office  and business parks. The Partnerships
have completed the  acquisition and  development phase of  their businesses  and
currently  focus  on operating  the  storage centers.  The  principal investment
objectives of the  Partnerships are  to provide their  Unitholders with  regular
quarterly  cash distributions which, for taxable Unitholders, are expected to be
partially tax-sheltered; to obtain long-term appreciation in the value of  their
property;   and  to  preserve  and   protect  their  Unitholders'  capital.  The
Partnerships share executive offices with the Company.
 
    The  following  table   sets  forth  selected   information  regarding   the
capitalization,  investments, leverage and real estate portfolio investments for
each of the Partnerships and their properties.
 
<TABLE>
<CAPTION>
                                                                                                               PERCENT LEVERAGE
                                               INVESTMENT IN    ACCUMULATED                      AMOUNT OF      OF REAL ESTATE
                     DATE     ORIGINAL TOTAL   PROPERTIES AT    DEPRECIATION   NET BOOK VALUE   LEVERAGE AT     APPRAISAL VALUE
                   OFFERING      CAPITAL         JUNE 30,       AT JUNE 30,     AT JUNE 30,       JUNE 30,        AT JUNE 30,
PARTNERSHIP         CLOSED      RAISED (1)       1996 (2)           1996          1996 (3)        1996 (4)         1996 (5)
- -----------------  ---------  --------------  ---------------  --------------  --------------  --------------  -----------------
<S>                <C>        <C>             <C>              <C>             <C>             <C>             <C>
IDS1.............   Mar-89    $   37,052,578  $    36,120,608  $    7,850,441  $   26,248,119  $            0           0.0%
IDS2.............   Mar-90        28,777,448       29,660,239       5,112,767      21,441,739       3,300,930          10.8
IDS3.............   Mar-92        29,803,675       37,636,439       3,859,355      23,881,173      10,333,498          20.3
                              --------------  ---------------  --------------  --------------  --------------        ------
    Total........             $   95,633,701  $   103,417,286  $   16,822,563  $   72,571,031  $   13,634,428          11.2%
                              --------------  ---------------  --------------  --------------  --------------        ------
                              --------------  ---------------  --------------  --------------  --------------        ------
</TABLE>
 
- ------------------------
(1) Total capital represents the gross offering proceeds raised from  investors,
    including General Partner and Unitholder contributions.
 
(2) Amount  represents  the total  investment in  land, buildings,  and personal
    property prior to depreciation.
 
(3) Net book value equals the Partnership's total assets less total  liabilities
    as of June 30, 1996.
 
(4) Amount represents total short- and long-term debt outstanding.
 
(5) The  percentages included  in this  column for  each of  the Partnerships is
    equal to a Partnership's outstanding debt as of June 30, 1996 divided by the
    Appraised Value of that Partnership's real estate portfolio. The "Total" was
    computed  by  dividing  the  aggregate  outstanding  debt  of  all  of   the
    Partnerships  by  the aggregate  value  of the  Partnerships'  properties as
    determined by the Appraisals.
 
                                       98
<PAGE>
    The following  table sets  forth  certain information  with respect  to  the
timing of investments in the Partnerships.
 
<TABLE>
<CAPTION>
                                                                        TIME TO
                                                                     INVEST 90% OF                   ORIGINAL      ORIGINAL
                                              YEAR OF     YEAR OF       AMOUNT         AVERAGE       EXPECTED      EXPECTED
                               NUMBER OF       FIRST        LAST     AVAILABLE FOR    LENGTH OF      HOLDING     DISPOSITION
PARTNERSHIP                   INVESTMENTS    INVESTMENT  INVESTMENT   INVESTMENT    INVESTMENT (1)  PERIOD (2)     TIME (3)
- --------------------------  ---------------  ----------  ----------  -------------  -------------  ------------  ------------
<S>                         <C>              <C>         <C>         <C>            <C>            <C>           <C>
IDS1 (4)..................            12        1988        1990       20 months       7 years      7-9 years     1995-1999
IDS2......................             8        1988        1991       28 months      6.5 years     7-9 years     1995-2000
IDS3......................            17        1991        1994       30 months      3.5 years     5-10 years    1996-2004
</TABLE>
 
- ------------------------
(1) This  column is based on the simple average  of the length of time the first
    property acquired by the  Partnership has been held  by the Partnership  and
    the  length of time the  last property acquired by  the Partnership has been
    held by the Partnership.
 
(2) This is  the  anticipated holding  period  as stated  in  the  Partnership's
    prospectus.
 
(3) The  range of the original disposition time frame is based upon the date the
    first property was  acquired by  the Partnership plus  the minimum  original
    expected  holding period and the date the  last property was acquired by the
    Partnership plus the maximum original expected holding period.
 
(4) Includes four properties owned by SJP II  in which IDS1 owns a 70%  interest
    and the Company owns a 30% interest.
 
EMPLOYEES AND PROPERTY MANAGEMENT
 
    Management   of  the  Partnerships'  facilities  is  conducted  through  the
employees of the  Company pursuant  to the Management  Services Agreements.  See
"Conflicts  of Interest -- Management  Agreements." The Company provides on-site
managers as  well  as  operation  and district  managers  to  supervise  on-site
management.  Under  the Management  Services Agreements,  the salary  and salary
related expenses of on-site employees are borne by the Partnerships.
 
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 (the  "Superior
Court")  naming the  Company, Charles  K. Barbo,  Arthur W.  Buerk, each  of the
General Partners, SGPI, 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  Offers and the Mergers. The  Plaintiffs seek monetary damages and equitable
relief 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  Plaintiffs filed a motion to  preliminarily enjoin, among other things,
the Unitholders' vote at the Special  Meetings. A hearing was held on  September
25,  1996, in the Superior Court regarding  this motion. On October 3, 1996, the
Superior Court issued in an order denying the Plaintiffs' motion for preliminary
injunction.
 
    The Defendants intend to vigorously defend the lawsuit.
 
                                       99
<PAGE>
IDS1
 
PROPERTY INFORMATION
 
    IDS1 owns  and  operates eight  self  storage  properties and  holds  a  70%
interest  in SJP II, which owns four  self storage properties. The remaining 30%
interest in  SJP II  is held  by the  Company. These  12 properties,  which  are
located  in six states, contained approximately 764,000 net rentable square feet
(including 100%  of  the SJP  II  properties) and  had  a weighted  average  net
rentable square foot occupancy rate of approximately 89% as of June 30, 1996 and
a weighted average annual rent per net rentable square foot of $8.92 for the six
months ended June 30, 1996. IDS1 was organized on September 29, 1987.
 
    The  following table sets  forth the average occupancy  and average rent per
square foot for IDS1 for  the years ended December 31,  1993, 1994 and 1995  and
the six months ended June 30, 1996.
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED DECEMBER 31,           SIX MONTHS
                                                         -------------------------------------  ENDED JUNE 30,
                                                            1993         1994         1995           1996
                                                         -----------  -----------  -----------  ---------------
<S>                                                      <C>          <C>          <C>          <C>
Average occupancy......................................         90%          90%          90%            89%
Average rent per square foot...........................  $    7.33    $    8.03    $    8.63      $    8.92
</TABLE>
 
    The following table lists selected information regarding the storage centers
for IDS1.
<TABLE>
<CAPTION>
                                                                                                        OCCUPANCY AT
                                                                                             -----------------------------------
                                                                  NET RENTABLE
                                                                  SQUARE FEET                             DEC. 31,
                                                         YEAR     AT DEC. 31,                -----------------------------------
PROPERTY NAME       PROPERTY LOCATION    OWNED SINCE    BUILT         1995        ACREAGE      1991        1992         1993
- -----------------  --------------------  -----------  ----------  ------------  -----------  ---------     -----        -----
<S>                <C>                   <C>          <C>         <C>           <C>          <C>        <C>          <C>
South Military
 Hwy.............  Virginia Beach, VA          1988      1984          48,000          2.7           *           *            *
Midlothian
 Turnpike........  Richmond, VA                1988      1984          44,000          2.9           *           *            *
Burke............  Fairfax, VA                 1988      1984          32,000          1.7           *           *            *
Margate..........  Margate, FL                 1988    1984/86         75,000          4.0          89%         96%          92%
Walnut...........  Walnut, CA                  1988      1986          96,000          3.6          76          86           83
Ontario..........  Ontario, CA                 1988      1984          57,000          2.1           *           *            *
Morgan Falls.....  Dunwoody, GA                1988      1990          76,000          3.7          74          94           95
Factoria Square..  Bellevue, WA                1990      1989          70,000          1.9          70          93           95
Canton **........  Canton, MI                  1988      1986          58,000          3.3           *           *            *
Fraser **........  Fraser, MI                  1988      1985          73,000          5.2           *           *            *
Livonia **.......  Livonia, MI                 1988      1985          67,000          4.8           *           *            *
Warren **........  Warren, MI                  1988      1985          68,000          4.6           *           *            *
                                                                  ------------         ---
Total............                                                     764,000         40.5
                                                                  ------------         ---
                                                                  ------------         ---
 
<CAPTION>
                                          JUNE 30,
                                         -----------
PROPERTY NAME        1994       1995        1996
- -----------------  ---------  ---------  -----------
<S>                <C>        <C>        <C>
South Military
 Hwy.............          *          *           *
Midlothian
 Turnpike........          *          *           *
Burke............          *          *           *
Margate..........         92%        89%         88%
Walnut...........         82         78          77
Ontario..........          *          *           *
Morgan Falls.....         95         93          95
Factoria Square..         96         97          98
Canton **........          *          *           *
Fraser **........          *          *           *
Livonia **.......          *          *           *
Warren **........          *          *           *
Total............
</TABLE>
 
- ------------------------------
   * These properties are individually less than 10% of the total book value and
     of  total  gross revenue  of all  the properties  of IDS1  and SJP  II. The
     average occupancy of these  projects at December 31,  1993, 1994 and  1995,
     and June 30, 1996 was 86%, 87%, 89% and 92%, respectively.
 
  ** Property  owned by SJP II in which IDS1  has a 70% interest and the Company
     has a 30% interest. Net rentable square feet is the total for the property.
 
                                      100
<PAGE>
SELECTED FINANCIAL INFORMATION
 
    The following selected  consolidated financial information  is derived  from
the  historical consolidated  financial statements  of IDS1.  Selected unaudited
consolidated financial data  for the  six months ended  June 30,  1995 and  1996
include all adjustments (consisting only of normal recurring accruals) that IDS1
considers  necessary for a  fair presentation of  consolidated operating results
for such interim periods.  Results for the interim  periods are not  necessarily
indicative  of results for the full year. The consolidated financial information
set forth below should be read in conjunction with IDS1's consolidated financial
statements,  related  notes   and  other   consolidated  financial   information
incorporated by reference in this Proxy Statement/Prospectus.
 
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
 
<TABLE>
<CAPTION>
                                                                                                    SIX MONTHS ENDED
                                                          YEAR ENDED DECEMBER 31,                       JUNE 30,
(IN THOUSANDS, EXCEPT PER UNIT DATA AND    -----------------------------------------------------  --------------------
RATIOS)                                      1991       1992       1993       1994       1995       1995       1996
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                        <C>        <C>        <C>        <C>        <C>        <C>        <C>
OPERATING DATA:
Rental revenue...........................  $   4,154  $   4,853  $   5,463  $   5,996  $   6,465  $   3,143  $   3,278
Interest and other income................         20         24         29         60        107         50         19
Earnings.................................        867      1,488      1,821      2,224      2,503      1,142        867
Earnings per Unit (1)....................       5.56       9.54      11.67      14.25      16.04       7.32       5.56
Distributions to Unitholders.............      2,223      2,223      2,246      2,524      2,848      1,413      1,436
Distributions per Unit (1)...............      15.00      15.00      15.16      17.03      19.22       9.53       9.69
Earnings to fixed charges................     254.13      29.87      19.37      23.04      19.65      17.67     N/A
</TABLE>
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                             -----------------------------------------------------  JUNE 30,
                                               1991       1992       1993       1994       1995       1996
                                             ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
Cash and cash equivalents..................  $     321  $     853  $   1,282  $   1,877  $     669  $     865
Total assets...............................     32,419     32,943     32,278     31,948     29,739     29,407
Total assets to book value.................       1.11       1.16       1.16       1.17       1.11       1.12
Total assets to net asset value............                                                              0.73
Note payable...............................     --          1,537      1,496      1,451     --         --
Total liabilities..........................        333      1,807      1,782      1,764        365        711
General partner equity.....................       (178)      (220)      (248)      (269)      (294)      (326)
Limited partners' equity...................     29,394     28,585     28,069     27,657     27,186     26,574
Partners' equity...........................     29,216     28,365     27,821     27,388     26,892     26,248
Book value per unit........................        198        193        189        187        183        179
Net asset value per unit...................                                                               257
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                              SIX MONTHS ENDED
                                                    YEAR ENDED DECEMBER 31,                       JUNE 30,
                                     -----------------------------------------------------  --------------------
                                       1991       1992       1993       1994       1995       1995       1996
                                     ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                  <C>        <C>        <C>        <C>        <C>        <C>        <C>
OTHER DATA:
Cash flows provided by (used by):
  Operating activities.............  $   2,309  $   2,488  $   3,170  $   3,509  $   3,917  $   1,947  $   2,017
  Investing activities.............       (145)      (353)      (111)      (137)       (99)       (10)       (28)
  Financing activities.............     (2,498)    (1,602)    (2,631)    (2,777)    (5,027)    (1,819)    (1,793)
Net increase (decrease) in cash and
 cash equivalents..................       (334)       533        428        595     (1,209)       118        196
Funds from operations (2)..........      2,034      2,469      2,825      3,233      3,500      1,654      1,759
</TABLE>
 
- ------------------------------
(1)  Earnings  per Unit  and distributions  per Unit  are based  on earnings and
     distributions, respectively, allocated to  IDS1 Unitholders divided by  the
     number  of IDS1 Units outstanding  during the period (approximately 148,202
     IDS1 Units for all periods shown).
 
                                      101
<PAGE>
(2)  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, 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. IDS1 believes FFO is a meaningful disclosure as a supplement to
     net  income because net income implicitly  assumes that the value of assets
     diminish predictably over time while IDS1 believes that real estate  values
     have  historically risen  or fallen  with market  conditions. 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 IDS1's  operating performance  or liquidity.  In
     addition,  FFO is  not comparable  to "funds  from operations"  reported by
     other REITs that do not define funds from operations in accordance with the
     National Association of Real Estate  Investment Trusts' definition used  by
     IDS1.
 
     FFO for each of the periods presented is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                                                         SIX MONTHS ENDED
                                                               YEAR ENDED DECEMBER 31,                       JUNE 30,
                                                -----------------------------------------------------  --------------------
                                                  1991       1992       1993       1994       1995       1995       1996
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                                              (IN THOUSANDS)
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>        <C>
Earnings......................................  $     867  $   1,488  $   1,821  $   2,224  $   2,503  $   1,142  $     867
Depreciation and amortization.................      1,167        985      1,008      1,013      1,001        514        467
Deferred financing costs......................                    (4)        (4)        (4)        (4)        (2)    --
Transaction costs.............................                           --         --         --         --            425
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Funds from operations.......................  $   2,034  $   2,469  $   2,825  $   3,233  $   3,500  $   1,654  $   1,759
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
</TABLE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS
 
RESULTS OF OPERATIONS - SIX MONTHS ENDED JUNE 30, 1996 AND 1995.
 
    REVENUES.   IDS1's  rental revenue  for the six  months ended  June 30, 1996
increased $135,000 compared to the same period in 1995. Morgan Falls, Midlothian
Turnpike, and Warren storage centers  contributed the largest revenue gains  for
IDS1  through June 30, 1996.  Earnings from operations for  the six months ended
June 30, 1996 also increased $137,600 compared to the same period in 1995. These
increases are primarily due to  a 5.3% increase in  the average rental rate  per
square  foot and generally  stable occupancies throughout IDS1  at an average of
91% at June 30, 1996 compared to 92% at June 30, 1995.
 
    EXPENSES.  Real estate taxes increased $28,600 for the six months ended June
30, 1996 compared to the same period  in 1995. The majority of this increase  is
due  to  tax refunds  received in  the second  quarter  of 1995  as a  result of
successful real estate tax  appeals for the Fraser  and Margate storage  centers
which  lowered the 1995 expense. Depreciation expense declined as certain assets
became fully  depreciated;  this decrease  does  not affect  IDS1's  cash  flow.
Additionally,  there was an  elimination of interest  expense resulting from the
payoff of IDS1's bank note in late 1995.
 
RESULTS OF OPERATIONS - YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993.
 
    REVENUES.  IDS1's  performance increased  in 1995 and  1994 as  a result  of
significant  increases in revenue  and earnings. Earnings rose  13% from 1994 to
1995 and 22% from 1993 to 1994. Rental revenue also rose $469,000 in 1995  after
a  $533,000 increase  in 1994.  The 1995  revenue increase  was due  to a slight
increase in average  occupancies and a  7.5% increase in  average rental  rates.
Additionally,  all the  SJP II stores,  in which  IDS1 owns a  70% interest, had
significant revenue gains, with  1995 averaging 13.7%  over 1994. Revenue  gains
from  1993 to 1994  were primarily the  result of stable  occupancies and a 9.5%
increase in  average rental  rates. Average  occupancy has  increased  slightly,
averaging  88% at December 31,  1993 and 1994 to 89%  at December 31, 1995. IDS1
seeks to maximize  revenue by adjusting  rents to match  demand. Store  managers
evaluate their store's rental rates, based on unit demand, unit availability and
competitors'   rental  rates.  IDS1   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.
 
                                      102
<PAGE>
    EXPENSES.   Operating expenses  increased $110,000  in 1995  and $58,000  in
1994. The majority of the 1995 increase was due to the increased personnel costs
resulting  from additional hours worked by  managers, an increase in landscaping
expense during the  spring and summer  months at the  Canton, Fraser and  Warren
storage  centers, and repairs made to the  air conditioning units at the Margate
storage center.  In 1994,  operating expenses  increased due  to higher  utility
usage  from a  colder than  normal winter in  the South,  additional phone lines
installed for modem communications, and increased repair and maintenance at  the
Livonia and Morgan Falls storage centers due to snow removal and landscaping.
 
    Interest  expense increased $33,000 in 1995  after remaining stable in 1994.
The majority of the change in 1995  reflects the rise in the interest rate  from
7.75% at December 1994 to 9.25% at December 1995.
 
    Real  estate taxes decreased $25,000 in 1995  after an $11,300 drop in 1994.
The 1995 decrease was due to tax refunds received as a result of successful real
estate tax appeals for the Fraser, Margate and Ontario storage centers. The 1994
decrease was largely due to levy decreases in the Michigan districts. IDS1  does
not expect to be able to continue to decrease real estate taxes in the future.
 
    Administrative  expenses rose  $36,000 in  1995 after  a slight  increase in
1994. The 1995 increase is primarily due  to the increase in printing costs  for
IDS1's quarterly and annual reports.
 
LIQUIDITY AND CAPITAL RESOURCES - SIX MONTHS ENDED JUNE 30, 1996 AND 1995.
 
    TRANSACTION  COSTS.   On  July 1,  1996, IDS1  entered into  the Acquisition
Agreement with the Company, IDS2 and IDS3 whereby (i) the Company would commence
the IDS1 Offer and (ii) following completion of the IDS1 Offer, IDS1 would  seek
the  requisite  approval  by the  IDS1  Unitholders  for the  IDS1  Merger. Upon
consummation of the Merger all IDS1 Unitholders would receive Shares.
 
    In connection with the IDS1 Offer and IDS1 Merger, IDS1 is expected to incur
approximately $939,800 in costs. As of June 30, 1996, transaction costs totaling
approximately $425,400 have been  posted as expenses on  IDS1's books (of  which
approximately  $106,400 has already been paid). In  the event the IDS1 Merger is
not consummated, IDS1 will bear certain  expenses as defined in the  Acquisition
Agreement.
 
    Due  to  the  IDS1  Offer  and IDS1  Merger,  IDS1  distributions  have been
temporarily suspended.  Upon  completion  of  the  IDS1  Merger,  a  final  cash
distribution  will  be made  from IDS1  in an  amount, if  any, by  which IDS1'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 IDS1 Merger.
 
    INVESTING ACTIVITIES.  Capital  improvements for the  six months ended  June
30,  1996 totaled  $27,600 which  was comprised  largely of  ground and building
improvements to the Morgan Falls storage center as well as security upgrades  to
the Fraser storage center.
 
    DISTRIBUTIONS TO PARTNERS.  Annualized distribution rates were 7.75% 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 $338,800 from 1993
to 1994 and  $408,500 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 IDS1.
 
    INVESTING ACTIVITIES.   Investments in  storage centers  have been  $99,000,
$137,000, and $119,000 during 1995, 1994 and 1993, respectively. The majority of
improvements  in 1995 included  building improvements at  the Ontario and Canton
storage centers as well  as pavement upgrades at  the Warren and Canton  storage
centers.  Improvements completed during 1994 were security upgrades at the South
Military Highway, Walnut and  Ontario storage centers and  pavement work at  the
Canton  and Warren storage centers. In  1993, investments were for pavement work
at the Canton and Livonia
 
                                      103
<PAGE>
storage centers  and  security  equipment at  the  Midlothian  Turnpike  storage
center.  Planned  improvements  for  1996 total  approximately  $63,300  and are
expected to be funded from operations and cash reserves.
 
    FINANCING ACTIVITIES.  On December 6, 1995, IDS1 repaid its seven-year  note
payable  to a bank  of $1,418,201 with cash  accumulated from operations. During
1995, 1994 and 1993, IDS1 had made  principal payments on this note of  $33,000,
$45,000, and $41,000, respectively. IDS1 now has no outstanding long-term debt.
 
    DISTRIBUTIONS  TO  PARTNERS.   The  average annual  distribution  rates were
7.69%, 6.81% and 6.06% for 1995, 1994 and 1993, respectively. Distributions  are
expected  to  continue  on a  quarterly  basis  and will  reflect  IDS1's future
operating results and cash position.
 
IDS2
 
PROPERTY INFORMATION
 
    IDS2  owns  and  operates  eight   self  storage  properties.  These   eight
properties,  which are located  in five states,  contained approximately 538,000
net rentable square  feet and had  a weighted average  net rentable square  foot
occupancy  rate of approximately 89% as of  June 30, 1996 and a weighted average
annual rent per net rentable square foot of $8.88 for the six months ended  June
30, 1996. IDS2 was organized on November 15, 1988.
 
    The  following table sets  forth the average occupancy  and average rent per
square foot for IDS2 for  the years ended December 31,  1993, 1994 and 1995  and
the six months ended June 30, 1996.
 
<TABLE>
<CAPTION>
                                                             YEAR ENDED DECEMBER 31,           SIX MONTHS
                                                      -------------------------------------       ENDED
                                                         1993         1994         1995       JUNE 30, 1996
                                                      -----------  -----------  -----------  ---------------
<S>                                                   <C>          <C>          <C>          <C>
Average occupancy...................................         87%          91%          88%            89%
Average rent per square foot........................  $    7.78    $    8.08    $    8.59      $    8.88
</TABLE>
 
    The following table lists selected information regarding the storage centers
for IDS2.
<TABLE>
<CAPTION>
                                                                                                     OCCUPANCY AT
                                                                                            -------------------------------
                                                                 NET RENTABLE
                                                                 SQUARE FEET                           DEC. 31,
                                                        YEAR     AT DEC. 31,                -------------------------------
PROPERTY NAME       PROPERTY LOCATION    OWNED SINCE    BUILT        1995        ACREAGE      1991       1992       1993
- -----------------  --------------------  -----------  ---------  ------------  -----------  ---------  ---------  ---------
<S>                <C>                   <C>          <C>        <C>           <C>          <C>        <C>        <C>
Orange...........  Orange, CA                  1989     1985          90,000          2.8          89%        92%        91%
Sterling
 Heights.........  Sterling Heights, MI        1988     1986         105,000          8.9          92         92         95
Newport News
 North...........  Newport News, VA            1989     1986          59,000          3.8           *          *          *
Chesapeake.......  Chesapeake, VA              1989    1986/95        58,000          5.2           *          *          *
Leesburg.........  Leesburg, VA                1989     1986          28,000          1.6           *          *          *
T.C. Jester......  Houston, TX                 1990     1990          64,000          2.8          72         73         92
Bellefield.......  Bellevue, WA                1990    1978/86        67,000          2.9          90         89         92
Kennydale........  Renton, WA                  1991     1991          67,000          2.8          28         74         91
                                                                 ------------         ---
Total............                                                    538,000         30.8
                                                                 ------------         ---
                                                                 ------------         ---
 
<CAPTION>
                                          JUNE 30,
                                         -----------
PROPERTY NAME        1994       1995        1996
- -----------------  ---------  ---------  -----------
<S>                <C>        <C>        <C>
Orange...........         92%        86%         86%
Sterling
 Heights.........         88         80          84
Newport News
 North...........          *          *           *
Chesapeake.......          *          *           *
Leesburg.........          *          *           *
T.C. Jester......         92         87          85
Bellefield.......         93         93          93
Kennydale........         91         87          88
Total............
</TABLE>
 
- ------------------------------
   * These properties are individually less than 10% of the total book value and
     of total gross revenue of all the properties of IDS2. The average occupancy
     of  these projects at December  31, 1993, 1994 and  1995, and June 30, 1996
     was 88%, 87%, 88% and 96%, respectively.
 
                                      104
<PAGE>
SELECTED FINANCIAL INFORMATION
 
    The following selected financial information is derived from the  historical
financial  statements of  IDS2. Selected  unaudited financial  data for  the six
months ended June 30, 1995 and 1996 include all adjustments (consisting only  of
normal recurring accruals) that IDS2 considers necessary for a fair presentation
of  operating results for such interim  periods. Results for the interim periods
are not  necessarily indicative  of results  for the  full year.  The  financial
information  set forth below should be read in conjunction with IDS2's financial
statements, related  notes  and  other  financial  information  incorporated  by
reference in this Proxy Statement/Prospectus.
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 
<TABLE>
<CAPTION>
                                                                                                   SIX MONTHS ENDED
                                                         YEAR ENDED DECEMBER 31,                       JUNE 30,
(IN THOUSANDS, EXCEPT PER UNIT DATA AND   -----------------------------------------------------  --------------------
RATIOS)                                     1991       1992       1993       1994       1995       1995       1996
                                          ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                       <C>        <C>        <C>        <C>        <C>        <C>        <C>
OPERATING DATA:
Rental revenue..........................  $   2,277  $   3,240  $   3,618  $   4,038  $   4,309  $   2,065  $   2,255
Interest and other income...............        104          7          4         20         11          4         10
Earnings................................      1,134        968      1,094      1,340      1,461        618        467
Earnings per Unit (1)...................       9.36       7.99       9.03      11.06      12.06       5.10       3.86
Distributions to Unitholders............      1,799      1,799      1,799      1,817      1,871        935        935
Distributions per Unit (1)..............      15.62      15.62      15.62      15.78      16.25       8.13       8.13
Earnings to fixed charges...............     753.33      10.33       7.40       6.42       6.52       5.39       4.23
</TABLE>
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                             -----------------------------------------------------  JUNE 30,
                                               1991       1992       1993       1994       1995       1996
                                             ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
Cash and cash equivalents..................  $     159  $     365  $     621  $     385  $     455  $     444
Total assets...............................     26,372     26,124     26,322     25,866     25,685     25,197
Total assets to book value.................       1.06       1.10       1.14       1.15       1.17       1.18
Total assets to net asset value............                                                              0.94
Notes payable..............................      1,240      1,794      3,005      2,938      3,338      3,301
Total liabilities..........................      1,608      2,286      3,283      3,399      3,727      3,755
General partner equity.....................        (42)       (88)      (128)      (156)      (181)      (207)
Limited partners' equity...................     24,805     23,926     23,157     22,623     22,140     21,649
Partners' equity...........................     24,763     23,838     23,039     22,467     21,959     21,442
Book value per unit........................        215        208        201        197        192        188
Net asset value per unit...................                                                               222
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                               SIX MONTHS ENDED
                                                     YEAR ENDED DECEMBER 31,                       JUNE 30,
                                      -----------------------------------------------------  --------------------
                                        1991       1992       1993       1994       1995       1995       1996
                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>
OTHER DATA:
Cash flows provided by (used by):
  Operating activities..............  $   1,941  $   1,939  $   1,751  $   2,211  $   2,501  $   1,086  $   1,101
  Investing activities..............     (4,588)       (24)      (810)      (430)      (861)      (722)       (10)
  Financing activities..............     (1,893)    (1,710)      (684)    (2,017)    (1,570)      (602)    (1,102)
Net increase (decrease) in cash and
 cash equivalents...................     (4,540)       205        257       (236)        70       (238)       (11)
Funds from operations (2)...........      1,813      1,836      1,983      2,234      2,370      1,063      1,211
</TABLE>
 
- ------------------------------
(1)  Earnings  per Unit  and distributions  per Unit  are based  on earnings and
     distributions, respectively, allocated to  IDS2 Unitholders divided by  the
     number  of IDS2 Units outstanding  during the period (approximately 115,110
     IDS2 Units for all periods shown).
 
(2)  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, plus  or minus certain  nonrecurring revenue and
     expenses. Contributions to FFO
 
                                      105
<PAGE>
     from unconsolidated entities in which the reporting entity holds an  active
     interest are to be reflected in FFO on the same basis. IDS2 believes FFO is
     a  meaningful disclosure as  a supplement to net  income because net income
     implicitly assumes that the value of assets diminish predictably over  time
     while  IDS2 believes  that real  estate values  have historically  risen or
     fallen with  market  conditions. 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  IDS2's
     operating  performance or liquidity. In addition,  FFO is not comparable to
     "funds from operations" reported  by other REITs that  do not define  funds
     from  operations in accordance with the National Association of Real Estate
     Investment Trusts' definition used by IDS2.
 
    FFO for each of the periods presented is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                                                         SIX MONTHS ENDED
                                                               YEAR ENDED DECEMBER 31,                       JUNE 30,
                                                -----------------------------------------------------  --------------------
(IN THOUSANDS)                                    1991       1992       1993       1994       1995       1995       1996
- ----------------------------------------------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                             <C>        <C>        <C>        <C>        <C>        <C>        <C>
Earnings......................................  $   1,134  $     968  $   1,094  $   1,340  $   1,461  $     618  $     467
Depreciation and amortization.................        679        870        894        903        919        450        464
Deferred financing costs......................     --             (2)        (5)        (9)       (10)        (5)        (5)
Transaction costs.............................     --         --         --         --         --         --            285
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
    Funds from operations.....................  $   1,813  $   1,836  $   1,983  $   2,234  $   2,370  $   1,063  $   1,211
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                ---------  ---------  ---------  ---------  ---------  ---------  ---------
</TABLE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS
 
RESULTS OF OPERATIONS - SIX MONTHS ENDED JUNE 30, 1996 AND 1995.
 
    REVENUES.  IDS2's  rental revenue  for the six  months ended  June 30,  1996
increased  $190,500 compared to the same  period in 1995. Additionally, earnings
from operations also increased $132,600 for  the six months ended June 30,  1996
compared  to the same period in 1995.  These increases resulted primarily from a
5.5% increase in the average rental rate per square foot as well as the increase
in revenue from storage center expansions. Chesapeake, Sterling Heights and T.C.
Jester  storage  centers  contributed  the   largest  revenue  gains  in   IDS2.
Occupancies for the Partnership remained stable at an average of 94% at June 30,
1996 and 1995.
 
    EXPENSES.   Total expenses for the six  months ended June 30, 1996 rose 4.4%
compared to the same period in  1995. Operating and administrative expenses  for
the six months ended June 30, 1996 increased 7.1% compared to the same period in
1995  primarily due to increased personnel  costs due to additional hours worked
by store  managers  and  increased salaries.  Additionally,  real  estate  taxes
decreased  by 3.7% for the  six months ended June 30,  1996 compared to the same
period in 1995  largely due  to a  lower tax  assessment at  the Orange  storage
center.
 
RESULTS OF OPERATIONS - YEARS ENDED DECEMBER 31, 1995, 1994 AND 1993.
 
    REVENUES.   IDS2's  rental revenue  rose $271,000  and $420,000  in 1995 and
1994, respectively.  These increases  resulted primarily  from the  rise in  the
average rental rate per square foot from $7.78 in 1993 to $8.08 in 1994 to $8.59
in  1995 as well as storage  center expansions. Additionally, earnings increased
$120,000 in 1995 and $246,000 in 1994.  The average occupancy for all of  IDS2's
storage  centers  was 87%,  90% and  91% at  December 31,  1995, 1994  and 1993,
respectively. Although the average occupancy for IDS2 decreased three percentage
points during  1995, total  revenue increased  as a  result of  IDS2 seeking  to
maximize  revenue by  adjusting rents to  match demand.  Store managers evaluate
their store's  rental  rates,  based  on  unit  demand,  unit  availability  and
competitors'   rental  rates.  IDS2   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.
 
    EXPENSES.  Operating  expenses increased  $68,000 in 1995  after an  $89,000
increase  in 1994. Operating  expenses for 1995 rose  primarily due to increased
hours worked  by store  managers,  higher postage  and supply  costs,  increased
payout   of   tenant  claims   and   foreclosure  expenses   and   the  increase
 
                                      106
<PAGE>
in utility expense at  the Chesapeake storage center  due to the new  expansion.
Increases  in 1994 were  primarily attributable to  repair and maintenance costs
for the air conditioning unit at  T.C. Jester and higher salary cost  throughout
IDS2's storage centers.
 
    Real estate taxes decreased each year from 1993 to 1995. The slight decrease
in  1995 was due to a tax refund received  in 1995 as a result of the successful
real estate tax appeal  of the Sterling Heights  storage center's 1994  assessed
value.  The decrease in real  estate taxes in 1994  was accredited to winning an
appeal for Kennydale's  1993 and 1994  assessed value. The  refund due for  1993
taxes  was offset against the taxes due in 1994. IDS2 does not expect to be able
to continue to decrease real estate taxes in the future.
 
    Additionally, interest expense rose  $16,000 and $72,000  in 1995 and  1994,
respectively.  The increase in  1995 was due to  additional borrowings on IDS2's
line of credit to fund  the Chesapeake expansion as well  as the slight rise  in
interest  rates from 8.125% at December 31, 1994 to 8.5% at December 31, 1995 on
the commercial bank note  totaling $1,200,000. The increase  in 1994 was due  to
IDS2  borrowing on its line  of credit to finance  the expansion of Newport News
North, which was subsequently refinanced.
 
    Administrative expenses  rose $29,000  in 1995  after a  slight increase  in
1994.  The 1995 increase was primarily due to the increase in printing costs for
IDS2's quarterly and annual reports.
 
LIQUIDITY AND CAPITAL RESOURCES - SIX MONTHS ENDED JUNE 30, 1996 AND 1995.
 
    TRANSACTION COSTS.   On  July 1,  1996, IDS2  entered into  the  Acquisition
Agreement with the Company, IDS1 and IDS3 whereby (i) the Company would commence
the  IDS2 Offer and (ii) following completion of the IDS2 Offer, IDS2 would seek
the requisite approval by the Unitholders for the IDS2 Merger. Upon consummation
of the IDS2 Merger all IDS2 Unitholders would receive Shares.
 
    In connection with the IDS2 Offer and IDS2 Merger, IDS2 is expected to incur
approximately $630,100 in costs. As of June 30, 1996 transaction costs totalling
approximately $285,200 have  been posted  as expenses  on the  IDS2's books  (of
which  approximately $80,800 has already been paid).  In the event that the IDS2
Merger is not  consummated, IDS2 will  bear certain expenses  as defined in  the
Acquisition Agreement.
 
    Due to this transaction, IDS2 distributions have been temporarily suspended.
Upon  completion of the IDS2 Merger, a final cash distribution will be made from
the IDS2 in an amount, if any,  by which IDS2's Closing Net Asset Value  exceeds
its  Net Asset Value. This distribution will  be received only by those who were
partners immediately prior to the IDS2 Merger.
 
    INVESTING ACTIVITIES.  Capital  improvements for the  six months ended  June
30,  1996, totalled $10,500, which includes  pavement work at the Chesapeake and
Kennydale storage  centers. IDS2  invested approximately  $688,000 for  the  six
months ended June 30, 1995 to expand the Chesapeake center.
 
    FINANCING ACTIVITIES.  As of May 1, 1995, IDS2 converted the $1,500,000 line
of  credit to an $850,000 non-revolving line  of credit with an interest rate of
prime plus one half percent maturing May 1, 1997. For the six months ended  June
1,  1995,  IDS2  drew $415,000  on  the line  of  credit  in order  to  fund the
Chesapeake buildout.
 
    DISTRIBUTIONS TO PARTNERS.   The annualized distribution  rate was 6.5%  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 $460,800 from 1993
to 1994 and  $289,500 from 1994  to 1995, reflecting  the increase in  earnings.
These fluctuations reflect changes in earnings adjusted by the timing of certain
expense  payments and payments due to  affiliates. Management believes that cash
balances and cash flow  from operations will be  adequate to support the  future
operating needs of IDS2.
 
                                      107
<PAGE>
    INVESTING  ACTIVITIES.   During  1994 and  1995 IDS2  invested approximately
$1,200,000 to expand the  Chesapeake storage center.  This project entailed  the
construction of two, one-story buildings adding approximately 26,000 square feet
of  storage space, as well  as the addition of 2,400  square feet of RV parking.
The new  expansion opened  the beginning  of  April 1995  and is  currently  76%
occupied.  The  expenditures during  1994 and  1995  were primarily  funded from
operating cash flow and cash reserves; the remaining costs were funded from  the
line  of  credit.  The  expansion  of  IDS2's  existing  facilities  provides an
opportunity to  increase revenue  without a  significant increase  in  operating
costs.  In 1993 IDS2 completed the expansion at  Newport News North at a cost of
$763,000. This expansion added 26,000 square feet to the existing 33,000  square
feet  of  storage. The  additional space  includes  both climate  controlled and
non-climate controlled units.
 
    Additionally,  investments  in  the  remaining  storage  centers  have  been
$69,000,  $51,000 and  $47,000 in  1995, 1994  and 1993,  respectively. In 1995,
investments included  pavement  work  at the  Sterling  Heights  and  Bellefield
storage  centers as well as security upgrades  at the Orange storage center. The
majority of  improvement  in 1994  were  security  upgrades at  the  Orange  and
Sterling Heights storage centers. During 1993 improvements included new pavement
at  the Bellefield  and Sterling  Heights storage centers  as well  as new doors
installed at  the Orange  storage center.  Planned improvements  for 1996  total
approximately $91,000 and are expected to be funded from operations of IDS2.
 
    FINANCING   ACTIVITIES.    On  May  1,   1995,  IDS2  obtained  an  $850,000
non-revolving line of credit with interest rate of prime plus one half  percent,
maturing  May 1, 1997. During 1995, IDS2 drew  $470,000 on the line of credit in
order to fund  the Chesapeake expansion.  IDS2 intends to  pay off or  refinance
this  line  of  credit  from  operating  cash  flow  over  the  next  two years.
Additionally, in  1994, IDS2  converted its  $1,250,000 line  of credit  into  a
seven-year note which will mature in March 2001.
 
    DISTRIBUTIONS  TO PARTNERS.  Annualized  distribution rates were 6.5%, 6.31%
and 6.25% for 1995, 1994 and  1993, respectively. Distributions are expected  to
continue  on a quarterly basis and  will reflect IDS2's future operating results
and cash position.
 
                                      108
<PAGE>
IDS3
 
PROPERTY INFORMATION
 
    IDS3 owns and operates 16 self  storage properties and one office  building.
These  17 properties, which are located in seven states, contained approximately
1,000,000 net  rentable square  feet and  had a  weighted average  net  rentable
square  foot  occupancy rate  of approximately  86% as  of June  30, 1996  and a
weighted average annual rent per net rentable  square foot of $7.87 for the  six
months ended June 30, 1996. IDS3 was organized on November 15, 1988.
 
    The  following table sets  forth the average occupancy  and average rent per
square foot for ISD3 for  the years ended December 31,  1993, 1994 and 1995  and
the six months ended June 30, 1996.
 
<TABLE>
<CAPTION>
                                                                YEAR ENDED DECEMBER 31,           SIX MONTHS
                                                         -------------------------------------  ENDED JUNE 30,
                                                            1993         1994         1995           1996
                                                         -----------  -----------  -----------  ---------------
<S>                                                      <C>          <C>          <C>          <C>
Average occupancy......................................         90%          92%          89%            86%
Average rent per square foot...........................  $    5.79    $    6.72    $    7.45      $    7.87
</TABLE>
 
    The following table lists selected information regarding the storage centers
for IDS3.
<TABLE>
<CAPTION>
                                                                                                      OCCUPANCY AT
                                                                                          -------------------------------------
                                                               NET RENTABLE
                                                               SQUARE FEET                              DEC. 31,
                                                      YEAR     AT DEC. 31,                -------------------------------------
PROPERTY NAME     PROPERTY LOCATION    OWNED SINCE    BUILT        1995        ACREAGE       1991         1992         1993
- ---------------  --------------------  -----------  ---------  ------------  -----------  -----------  -----------  -----------
<S>              <C>                   <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    1973/75        42,000          2.6           *            *            *
Windcrest......  San Antonio, TX             1991    1975/93        86,000          6.5           *            *            *
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     1995          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    1975/88        69,000          2.8         N/A          N/A           96%
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          N/A
San Lorenzo....  San Lorenzo, CA             1994     1990          54,000          1.9         N/A          N/A          N/A
Castro Valley
 Office
 Building......  Castro Valley, CA           1994     1989           3,000          0.3         N/A          N/A          N/A
                                                               ------------         ---
Total..........                                                  1,000,000         74.7
                                                               ------------         ---
                                                               ------------         ---
 
<CAPTION>
                                             JUNE 30,
                                           ------------
PROPERTY NAME       1994         1995          1996
- ---------------  -----------  -----------  ------------
<S>              <C>          <C>          <C>
Gilbert........          *            *             *
Delray Beach...          *            *             *
Allen Blvd.....          *            *             *
Windcrest......          *            *             *
Dobson Ranch...          *            *             *
Norcross.......          *            *             *
Stone
 Mountain......          *            *             *
Tucker.........          *            *             *
Forest Park....          *            *             *
Rochester......          *            *             *
Castro
 Valley........         95%          91%           94%
Newark.........          *            *             *
San Leandro....          *            *             *
Tracy..........          *            *             *
Sacramento.....          *            *             *
San Lorenzo....          *            *             *
Castro Valley
 Office
 Building......          *            *             *
Total..........
</TABLE>
 
- ------------------------------
   * These properties are individually less than 10% of the total book value and
     of total gross revenue of all the properties of IDS3. The average occupancy
     of  these projects at December  31, 1993, 1994 and  1995, and June 30, 1996
     was 93%, 92%, 87% and 89%, respectively.
 
                                      109
<PAGE>
SELECTED FINANCIAL INFORMATION
 
    The following selected financial information is derived from the  historical
financial  statements of  IDS3. Selected  unaudited financial  data for  the six
months ended June 30, 1995 and 1996 include all adjustments (consisting only  of
normal recurring accruals) that IDS3 considers necessary for a fair presentation
of  operating results for such interim  periods. Results for the interim periods
are not  necessarily indicative  of results  for the  full year.  The  financial
information  set forth below should be read in conjunction with IDS3's financial
statements, related  notes  and  other  financial  information  incorporated  by
reference in this Proxy Statement/Prospectus.
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
<TABLE>
<CAPTION>
                                                                                                    SIX MONTHS ENDED
                                                          YEAR ENDED DECEMBER 31,                       JUNE 30,
(IN THOUSANDS, EXCEPT PER UNIT DATA AND    -----------------------------------------------------  --------------------
RATIOS)                                      1991       1992       1993       1994       1995       1995       1996
                                           ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                        <C>        <C>        <C>        <C>        <C>        <C>        <C>
OPERATING DATA:
Rental revenue...........................  $     355  $   2,573  $   4,110  $   6,609  $   7,225  $   3,510  $   3,673
Interest and other income................        584        333        230         57         36         13         15
Earnings.................................        607      1,065      1,427      1,655      1,885        822        644
Earnings per Unit (1)....................       9.76       8.98      11.37      13.19      15.02       6.55       5.13
Distributions to Unitholders.............        685      1,556      1,825      2,124      2,235      1,117      1,117
Distributions per Unit (1)...............      11.59      13.80      15.31      17.81      18.75       9.37       9.37
Earnings to fixed charges................        N/A        N/A      10.80       2.91       2.87       2.70       2.41
</TABLE>
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                             -----------------------------------------------------  JUNE 30,
                                               1991       1992       1993       1994       1995       1996
                                             ---------  ---------  ---------  ---------  ---------  ---------
<S>                                          <C>        <C>        <C>        <C>        <C>        <C>
BALANCE SHEET DATA:
Cash and cash equivalents..................  $  13,642  $   8,533  $     723  $     602  $     673  $     693
Total assets...............................     20,320     26,271     36,726     36,930     35,636     35,130
Total assets to book value.................       1.02       1.01       1.44       1.48       1.46       1.47
Total assets to net asset value............                                                              0.89
Notes payable..............................     --         --         10,821     11,620     10,746     10,333
Total liabilities..........................        363        314     11,264     12,049     11,222     11,249
General partner equity.....................          1        (28)       (52)       (81)      (105)      (131)
Limited partners' equity...................     19,956     25,984     25,514     24,963     24,519     24,012
Partners' equity...........................     19,957     25,956     25,462     24,882     24,414     23,881
Book value per unit........................        222        218        214        209        206        201
Net asset value per unit...................                                                               308
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                               SIX MONTHS ENDED
                                                     YEAR ENDED DECEMBER 31,                       JUNE 30,
                                      -----------------------------------------------------  --------------------
                                        1991       1992       1993       1994       1995       1995       1996
                                      ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>        <C>
OTHER DATA:
Cash flows provided by (used by):
  Operating activities..............  $     727  $   1,648  $   2,388  $   3,108  $   3,445  $   1,805  $   1,929
  Investing activities..............     (5,771)   (11,866)   (16,148)      (876)      (147)       (37)      (195)
  Financing activities..............     11,171      5,109      5,951     (2,353)    (3,227)    (1,653)    (1,714)
Net increase (decrease) in cash and
 cash equivalents...................      6,127     (5,109)    (7,809)      (121)        71        115         20
Funds from operations (2)...........        672      1,532      2,277      3,126      3,342      1,593      1,707
</TABLE>
 
- ------------------------------
(1)  Earnings  per Unit  and distributions  per Unit  are based  on earnings and
     distributions, respectively, allocated to  IDS3 Unitholders divided by  the
     number  of IDS3 Units outstanding  during the period (approximately 119,215
     IDS3 Units for all periods shown).
 
(2)  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  estate  and  amortization  of  intangible  assets  exclusive  of
 
                                      110
<PAGE>
     deferred  financing costs, plus  or minus certain  nonreucrring 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. IDS3 believes FFO is a meaningful disclosure as a supplement to
     net  income because net income implicitly  assumes that the value of assets
     diminish predictably over time while IDS3 believes that real estate  values
     have  historically risen  or fallen  with market  conditions. 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 IDS3's  operating performance  or liquidity.  In
     addition,  FFO is  not comparable  to "funds  from operations"  reported by
     other REITs that do not define funds from operations in accordance with the
     National Association of Real Estate  Investment Trusts' definition used  by
     IDS3.
 
    FFO for each of the period presented is calculated as follows:
 
<TABLE>
<CAPTION>
                                                                                                           SIX MONTHS ENDED
                                                                 YEAR ENDED DECEMBER 31,                       JUNE 30,
                                                  -----------------------------------------------------  --------------------
(IN THOUSANDS)                                      1991       1992       1993       1994       1995       1995       1996
- ------------------------------------------------  ---------  ---------  ---------  ---------  ---------  ---------  ---------
<S>                                               <C>        <C>        <C>        <C>        <C>        <C>        <C>
Earnings........................................  $     607  $   1,065  $   1,427  $   1,655  $   1,885  $     822  $     644
Depreciation and amortization...................         65        467        873      1,518      1,505        795        666
Deferred financing costs........................                              (23)       (47)       (48)       (24)       (24)
Transaction costs...............................                           --         --         --         --            421
                                                  ---------  ---------  ---------  ---------  ---------  ---------  ---------
  Funds from operations.........................  $     672  $   1,532  $   2,277  $   3,126  $   3,342  $   1,593  $   1,707
                                                  ---------  ---------  ---------  ---------  ---------  ---------  ---------
                                                  ---------  ---------  ---------  ---------  ---------  ---------  ---------
</TABLE>
 
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS
 
RESULTS OF OPERATIONS - SIX MONTHS ENDED JUNE 30, 1996 AND 1995.
 
    REVENUES.  IDS3'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 period last
year. The increase resulted primarily from  a 5% increase in the average  rental
rate  per square foot. During  the month of March, IDS3  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.
 
    EXPENSES.  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 IDS3'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  (i) an increase in
personnel costs associated with  additional hours worked  by store managers  and
increased  salaries, (ii) an  increase in marketing costs  in the Atlanta market
reflecting increased  yellow page  advertisement and  (iii) 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  affected  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,  IDS3's revenue and expenses  increased primarily due  to
the  acquisition of  new storage centers  and the interest  on the corresponding
debt.  During  this  period,  IDS3  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).
 
    IDS3'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  IDS3  has decreased,  it  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. IDS3 trains  its store managers  in
revenue  optimization and  empowers them to  adjust marginal  rental rates based
 
                                      111
<PAGE>
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 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 an 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, IDS3  entered into  the Acquisition
Agreement with  the  Company, IDS1  and  IDS2  whereby: (i)  the  Company  would
commence  the IDS3 Offer and  (ii) following completion of  the IDS3 Offer, IDS3
would seek the requisite approval by  the IDS3 Unitholders for the IDS3  Merger.
Upon consummation of the IDS3 Merger all IDS3 Unitholders would receive Shares.
 
    In connection with the IDS3 Offer and IDS3 Merger, IDS3 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  IDS3's books (of
which approximately $125,000 has already been paid). In the event that the  IDS3
Merger  is not consummated,  IDS3 will bear  certain expenses as  defined in the
Acquisition Agreement.
 
    Due to  the  IDS3  Offer  and IDS3  Merger,  IDS3  distributions  have  been
temporarily  suspended.  Upon  completion  of  the  IDS3  Merger,  a  final cash
distribution will  be made  from IDS3  in an  amount, if  any, by  which  IDS3's
Closing  Net Asset Value exceeds its Net  Asset Value. This distribution will be
received only by those who were partners immediately prior to the IDS3 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, IDS3  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,  IDS3 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.
 
                                      112
<PAGE>
    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 IDS3.
 
    INVESTING  ACTIVITIES.  In 1993, IDS3  invested $237,000 in existing storage
centers, including office  remodeling at  Norcross, Stone  Mountain, Tucker  and
Forest  Park  and new  signage at  Rochester. IDS3  also purchased  four storage
centers during the third quarter of 1993 at a total cost of $13.3 million.  IDS3
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
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  IDS3 with 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, IDS3 purchased an office building from
the same seller at a total cost of $500,000.
 
    In  1994,  IDS3  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, IDS3 acquired undeveloped land in Atlanta adjacent
to  each storage center. IDS3  has listed both parcels  with a local real estate
broker for resale.
 
    During 1995, IDS3 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, IDS3  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 IDS3'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, IDS3 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 IDS3'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  IDS3
the  option to borrow  up to an additional  $3 million. It  may be necessary for
IDS3 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, IDS3 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, IDS3 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. Distributions are expected to
continue on a quarterly basis and  will reflect IDS3's future operating  results
and cash position.
 
                                      113
<PAGE>
BENEFICIAL OWNERSHIP
 
    The  following table sets forth as of September 30, 1996 certain information
regarding beneficial ownership of equity  interests in the Partnerships and  the
Common  Stock by  the General  Partner of  each of  the Partnerships  and by the
individual general partners of each of the General Partners. The Partnerships do
not know of any other person  who beneficially owns directly or indirectly  more
than  5% of the interest in any  of the Partnerships. Except as otherwise noted,
the Partnerships believe that the  beneficial owners of interests listed  below,
based  on information furnished by such  owners, have sole voting and investment
power with respect to such interests.  Except as otherwise noted, all shares  of
Common Stock included in the following table are shares of the Company's Class A
Common Stock.
 
<TABLE>
<CAPTION>
                                                                                             SHARES OF COMMON
                                PERCENT OF EQUITY    SHARES OF COMMON   SHARES OF COMMON    STOCK BENEFICIALLY
                                INTEREST PRIOR TO         STOCK           STOCK TO BE        OWNED AFTER THE
                                   THE MERGERS         BENEFICIALLY        ISSUED IN           MERGERS (1)
                                ------------------    OWNED PRIOR TO    CONNECTION WITH    --------------------
NAME AND ADDRESS                IDS1   IDS2   IDS3     THE MERGERS      THE MERGERS (1)      NUMBER     PERCENT
- ------------------------------  ----   ----   ----   ----------------   ----------------   ----------   -------
<S>                             <C>    <C>    <C>    <C>                <C>                <C>          <C>
Shurgard Associates L.P. (2)      5%    --     --           --                80,133         80,133  (3)   *
1201 Third Ave.
Suite 2200
Seattle, WA 98101
Shurgard Associates L.P. II
(2)                              --      5%    --           --              53,724          53,724(3)     *
1201 Third Ave.
Suite 2200
Seattle, WA 98101
Shurgard Associates L.P. III
(2)                              --     --      5%(4)        --            118,430         118,430(3)     *
1201 Third Ave.
Suite 2200
Seattle, WA 98101
Charles K. Barbo                 *      *      *      710,126(5)(6)         40,553(7)      750,679        2.8%
1201 Third Ave.
Suite 2200
Seattle, WA 98101
Arthur W. Buerk                  *      *      *      437,841(8)            32,679(9)      470,520        1.8%
1201 Third Ave.
Seattle, WA 98101
</TABLE>
 
- ------------------------------
*Less than one percent.
 
(1)  Assumes  the  Share  Price  is  $25.00  and  that  all  three  Partnerships
    participate in the Mergers.
 
(2) The equity interests in the  Partnerships beneficially owned by the  General
    Partners  are beneficially owned by Charles  K. Barbo, an individual general
    partner of each  of the  General Partners and  the sole  shareholder of  the
    corporate  general partner  of each of  the General Partners,  and Arthur W.
    Buerk, an  individual  general partner  of  each of  the  General  Partners.
    Messrs. Barbo and Buerk disclaim beneficial ownership of at least 80% of the
    shares of Common Stock that will be
    beneficially  owned by the General Partners  after the Mergers, which shares
    are expected to be distributed to IPSC and the Company.
 
(3) The  shares  of Common  Stock  beneficially owned  by  each of  the  General
    Partners  after the Mergers will be  distributed to their respective limited
    and general partners in accordance with the applicable GP Agreement.
 
(4) In connection with the Mergers,  this percentage will increase to 7.5%.  See
    "Conflicts of Interest -- General Partner's Interest."
 
(5)  Includes 3,747  shares held  for Mr.  Barbo's individual  account under the
    Company's Employee Retirement Savings Plan  and Trust, 4,900 shares held  by
    trusts  of which Mr. Barbo is a trustee, 2,500 shares over which Mr. Barbo's
    wife has voting and investment power  and 6,000 shares issuable on  exercise
    of stock options currently exercisable or exercisable within 60 days.
 
(6)  Includes 78,075 shares of Class B  Common Stock, which are convertible into
    Class A Common Stock at a one-to-one ratio upon repayment of a loan made  in
    connection  with satisfaction of certain general partner capital obligations
    in connection with the Consolidation.
 
(7) Represents approximately 7,933, 5,319 and 7,851 shares issuable to Mr. Barbo
    with respect  to his  interest as  a  general partner  of the  IDS1  General
    Partner,   the  IDS2   General  Partner   and  the   IDS3  General  Partner,
    respectively; 160, 107 and 159 shares  issuable to SGPI, of which Mr.  Barbo
    is  the  sole shareholder,  as  the corporate  general  partner of  the IDS1
    General Partner,  the IDS2  General Partner  and the  IDS3 General  Partner,
    respectively;  and 4,007, 2,941 and 12,076 shares issuable by the Company to
    Mr. Barbo with  respect to the  IDS1 Merger,  the IDS2 Merger  and the  IDS3
    Merger, respectively, pursuant to the Contingent Shares Agreement.
 
(8)  Includes 76,529 shares of Class B  Common Stock, which are convertible into
    Class A Common Stock at a one-to-one ratio upon repayment of a loan made  in
    connection  with satisfaction of certain general partner capital obligations
    in connection with the Consolidation.
 
(9) Represents approximately 7,933, 5,319 and 7,851 shares issuable to Mr. Buerk
    with respect  to his  interest as  a  general partner  of the  IDS1  General
    Partner,   the  IDS2   General  Partner   and  the   IDS3  General  Partner,
    respectively, and 2,438, 1,789 and 7,349  shares issuable by the Company  to
    Mr.  Buerk with  respect to the  IDS1 Merger,  the IDS2 Merger  and the IDS3
    Merger, respectively, pursuant to the Contingent Shares Agreements.
 
                                      114
<PAGE>
                    DISTRIBUTIONS AND MARKET PRICES OF UNITS
 
PARTNERSHIP DISTRIBUTIONS
 
    The following table sets forth the distributions paid per Unit of IDS1, IDS2
and IDS3 in the periods indicated  below. Amounts paid in the indicated  quarter
were  determined based upon Partnership operations during the preceding quarter.
The original cost per Unit was $250 for each of the Partnerships.
<TABLE>
<CAPTION>
                                           1988 (1)     1989 (1)     1990 (1)      1991       1992       1993       1994
                                          -----------  -----------  -----------  ---------  ---------  ---------  ---------
<S>                                       <C>          <C>          <C>          <C>        <C>        <C>        <C>
IDS1
  Quarter 1.............................         N/A    $    2.76    $    3.75   $    3.75  $    3.75  $    3.75  $    4.06
  Quarter 2.............................         N/A         3.75         3.75        3.75       3.75       3.75       4.14
  Quarter 3.............................   $    2.25         3.75         3.75        3.75       3.75       3.75       4.38
  Quarter 4.............................        3.03         3.75         3.75        3.75       3.75       3.91       4.45
IDS2
  Quarter 1.............................         N/A          N/A         1.31        3.91       3.91       3.91       3.91
  Quarter 2.............................         N/A          N/A         4.13        3.91       3.91       3.91       3.91
  Quarter 3.............................         N/A          N/A         3.60        3.91       3.91       3.91       3.91
  Quarter 4.............................         N/A          N/A         3.91        3.91       3.91       3.91       4.06
IDS3
  Quarter 1.............................         N/A          N/A          N/A        3.44       3.75       3.75       4.22
  Quarter 2.............................         N/A          N/A          N/A        3.78       3.79       3.75       4.38
  Quarter 3.............................         N/A          N/A          N/A        3.78       3.87       3.75       4.53
  Quarter 4.............................         N/A          N/A         3.76        3.75       3.75       4.06       4.69
 
<CAPTION>
                                            1995       1996
                                          ---------  ---------
<S>                                       <C>        <C>
IDS1
  Quarter 1.............................  $    4.69  $    4.84
  Quarter 2.............................       4.84       4.84
  Quarter 3.............................       4.84     --
  Quarter 4.............................       4.84     --
IDS2
  Quarter 1.............................       4.06       4.06
  Quarter 2.............................       4.06       4.06
  Quarter 3.............................       4.06     --
  Quarter 4.............................       4.06     --
IDS3
  Quarter 1.............................       4.69       4.69
  Quarter 2.............................       4.69       4.69
  Quarter 3.............................       4.69     --
  Quarter 4.............................       4.69     --
</TABLE>
 
- ------------------------
(1) "N/A" for a particular quarter means that the Partnership had not  commenced
    operations as of the immediately preceding quarter.
 
MARKET PRICES OF UNITS
 
    VOLUME  OF SALES.   The Units of IDS1,  IDS2 and IDS3 are  not listed on any
national securities exchange or quoted in the over the counter market, and there
is no established public trading market for the Units. Secondary sales  activity
for  the  Units has  been limited  and  sporadic. The  General Partner  for each
Partnership  monitors  transfers  of  its  Partnership  Units  (i)  because  the
admission  of the transferee as a  substitute Unitholder requires the consent of
the General Partner under each Partnership Agreement and (ii) in order to  track
compliance  with safe harbor provisions to avoid treatment as a "publicly traded
partnership"  for  tax  purposes.  While  the  General  Partners  receive   some
information  regarding the  prices at which  secondary sale  transactions in the
Units have  been effectuated,  they  do not  receive or  maintain  comprehensive
information  regarding the activities of all  broker/dealers and others known to
facilitate  secondary  sales  of  the  Units.  It  should  be  noted  that  some
transactions may not be reflected on the records of the Partnerships.
 
    The  General Partners estimate, based solely  on the transfer records of the
Partnerships,  that  the  number  of  Units  transferred  in  secondary   market
transactions  (i.e.,  excluding  transactions  believed  to  be  between related
parties, family members or the same beneficial owner) was as follows:
 
                                      IDS1
 
<TABLE>
<CAPTION>
                                                                                 % OF TOTAL
                                                                 NO. OF UNITS       UNITS           NO. OF
PERIOD                                                            TRANSFERRED    OUTSTANDING     TRANSACTIONS
- ---------------------------------------------------------------  -------------  -------------  -----------------
<S>                                                              <C>            <C>            <C>
1992...........................................................          821          .554%               13
1993...........................................................          248          .167                 8
1994...........................................................        2,244         1.514                35
1995...........................................................        1,204          .812                33
Six months ending June 30, 1996................................          993          .670                28
</TABLE>
 
                                      115
<PAGE>
                                      IDS2
 
<TABLE>
<CAPTION>
                                                                                 % OF TOTAL
                                                                 NO. OF UNITS       UNITS           NO. OF
PERIOD                                                            TRANSFERRED    OUTSTANDING     TRANSACTIONS
- ---------------------------------------------------------------  -------------  -------------  -----------------
<S>                                                              <C>            <C>            <C>
1992...........................................................          178          .155%                6
1993...........................................................           96          .083                 5
1994...........................................................          985          .856                22
1995...........................................................        1,232         1.070                36
Six months ending June 30, 1996................................          638          .554                19
</TABLE>
 
                                      IDS3
 
<TABLE>
<CAPTION>
                                                                                 % OF TOTAL
                                                                 NO. OF UNITS       UNITS           NO. OF
PERIOD                                                            TRANSFERRED    OUTSTANDING     TRANSACTIONS
- ---------------------------------------------------------------  -------------  -------------  -----------------
<S>                                                              <C>            <C>            <C>
1992...........................................................       --             --               --
1993...........................................................           84          .070%                4
1994...........................................................          372          .312                10
1995...........................................................          555          .466                16
Six months ending June 30, 1996................................          531          .445                15
</TABLE>
 
    SECONDARY MARKET INFORMATION.  Set forth  in the following table is  certain
information  regarding sale transactions in Units of the Partnerships, which was
obtained by  the  Company  and Partnerships  from  Stanger.  Stanger  summarizes
secondary  market prices for  the Units based on  actual transactions during the
reporting periods listed on the tables below. The transactions reflected in  the
tables  represent only some of the sale transactions in the Units. The following
secondary market  firms  provide  price  data to  Stanger:  2nd  Market  Capital
Services;  American  Partnership  Services;  Bigelow  Management,  Inc.; Chicago
Partnership Board; Cuyler & Associates; DCC Securities Corp.; Empire Securities;
EquityLine Properties; Equity Resources  Group; Fox &  Henry, Inc.; Frain  Asset
Management;   MacKenzie-Patterson  Securities;  Murillo  &  Company;  Nationwide
Partnership Marketplace;  New  York Partnership  Exchange;  Pacific  Partnership
Group; Partnership Service Network; Raymond James & Associates; Secondary Income
Funds; Securities Planners, Inc.; SunPoint Securities, Inc.; and The Partnership
Marketing Company.
 
    The information from Stanger set forth below is also reported in The Stanger
Report,  a  monthly  trade  publication. The  following  legend  accompanies the
secondary  market  information   included  in  The   Stanger  Report:   "Limited
partnerships  are designed as illiquid,  long-term investments. Secondary market
prices generally do not reflect the current value of partnership assets, nor are
they indicative of total return since prior cash distributions and tax  benefits
received  by the original  investor are not reflected  in the price. Transaction
prices are not verified by Robert A. Stanger & Company."
 
    Because no assurances can be given  that the prices reflected in the  tables
below  represent the  true value  of the Units,  such information  should not be
relied upon as indicative of the ability of the Unitholders to sell their  Units
in  secondary sale transactions or  as to the prices at  which such Units may be
sold.
 
                                      116
<PAGE>
                       IDS1 SECONDARY MARKET INFORMATION
 
<TABLE>
<CAPTION>
                                                        TRANSACTION PRICE(1)
                                                        --------------------
REPORTING PERIOD                                           LOW       HIGH      NUMBER OF UNITS
- ------------------------------------------------------  ---------  ---------  -----------------
<S>                                                     <C>        <C>        <C>
1992
  Quarter 1 (2).......................................     --         --             --
  Quarter 2...........................................  $   95.63  $  142.86            328
  Quarter 3...........................................     100.00     126.26            161
  Quarter 4...........................................     125.00     125.00             35
1993
  Quarter 1...........................................     119.00     129.00             65
  Quarter 2...........................................     129.00     139.00            136
  Quarter 3...........................................     129.60     150.00             74
  Quarter 4...........................................     152.00     152.00            260
1994
  Quarter 1...........................................     145.00     175.00            954
  Quarter 2...........................................     150.00     170.00            359
  Quarter 3...........................................     160.00     180.00            287
  Quarter 4...........................................     155.00     175.00            512
1995
  Quarter 1...........................................     168.00     190.00            586
  Quarter 2...........................................     175.00     180.25            198
  Quarter 3...........................................     163.75     198.53            257
  Quarter 4...........................................     180.00     200.00            153
1996 (3)
  Quarter 1...........................................     150.00     198.00            413
  Quarter 2...........................................     185.00     214.00            380
</TABLE>
 
- ------------------------
(1) The Transaction Price is given on a per Unit basis. The General Partner does
    not  know  whether  the  transaction  prices  shown  are  before  or   after
    commissions.  However, the  secondary-market firms  providing information to
    Stanger are instructed that, if they act as "principals," the reported price
    per Unit  should include  any mark-ups  and  if they  act as  "agents,"  the
    reported price per Unit should include any commissions, unless the firm acts
    as  a  retail  broker.  The  firms are  further  instructed  not  to include
    commissions paid by retail buyers or sellers to their retail brokers.
 
(2) No trade was reported to Stanger during this quarter.
 
(3) Secondary market  information for  the  third quarter  of  1996 is  not  yet
    available from Stanger.
 
                                      117
<PAGE>
                       IDS2 SECONDARY MARKET INFORMATION
 
<TABLE>
<CAPTION>
                                                        TRANSACTION PRICE(1)
                                                        --------------------
REPORTING PERIOD                                           LOW       HIGH      NUMBER OF UNITS
- ------------------------------------------------------  ---------  ---------  -----------------
<S>                                                     <C>        <C>        <C>
1992
  Quarter 1...........................................  $  126.00  $  132.00            130
  Quarter 2 (2).......................................     --         --             --
  Quarter 3...........................................     100.00     132.20            114
  Quarter 4...........................................     119.58     130.00             96
1993
  Quarter 1...........................................     134.00     134.00             20
  Quarter 2...........................................     135.00     135.00             30
  Quarter 3 (2).......................................     --         --             --
  Quarter 4...........................................     157.00     157.00             18
1994
  Quarter 1...........................................     154.05     154.05             28
  Quarter 2...........................................     150.00     163.90            434
  Quarter 3...........................................     129.16     168.00            664
  Quarter 4...........................................     150.00     180.00            382
1995
  Quarter 1...........................................     146.00     177.00            440
  Quarter 2...........................................     149.00     176.58            102
  Quarter 3...........................................     150.00     185.97            569
  Quarter 4...........................................     170.00     185.98            266
1996 (3)
  Quarter 1...........................................     162.00     185.00            140
  Quarter 2...........................................     165.00     186.00             68
</TABLE>
 
- ------------------------
(1) The Transaction Price is given on a per Unit basis. The General Partner does
    not   know  whether  the  transaction  prices  shown  are  before  or  after
    commissions. However, the  secondary-market firms  providing information  to
    Stanger are instructed that, if they act as "principals," the reported price
    per  Unit  should include  any mark-ups  and  if they  act as  "agents," the
    reported price per Unit should include any commissions, unless the firm acts
    as a  retail  broker.  The  firms are  further  instructed  not  to  include
    commissions paid by retail buyers or sellers to their retail brokers.
 
(2) No trade was reported to Stanger during this quarter.
 
(3) Secondary  market  information for  the  third quarter  of  1996 is  not yet
    available from Stanger.
 
                                      118
<PAGE>
                       IDS3 SECONDARY MARKET INFORMATION
 
<TABLE>
<CAPTION>
                                                        TRANSACTION PRICE(1)
                                                        --------------------
REPORTING PERIOD                                           LOW       HIGH      NUMBER OF UNITS
- ------------------------------------------------------  ---------  ---------  -----------------
<S>                                                     <C>        <C>        <C>
1992
  Quarter 1 (2).......................................     --         --             --
  Quarter 2 (2).......................................     --         --             --
  Quarter 3 (2).......................................     --         --             --
  Quarter 4...........................................  $  131.00  $  131.00             20
1993
  Quarter 1 (2).......................................     --         --             --
  Quarter 2...........................................     129.00     167.00             53
  Quarter 3 (2).......................................     --         --             --
  Quarter 4...........................................     120.00     157.90            284
1994
  Quarter 1...........................................     166.00     166.00             60
  Quarter 2...........................................     182.00     182.00             60
  Quarter 3...........................................     166.25     175.00             80
  Quarter 4...........................................     160.00     194.25            140
1995
  Quarter 1...........................................     171.86     174.44             34
  Quarter 2...........................................     175.00     175.00             20
  Quarter 3...........................................     165.00     177.00            253
  Quarter 4...........................................     175.00     187.50            114
1996 (3)
  Quarter 1...........................................     165.00     200.00            294
  Quarter 2...........................................     180.00     200.00             38
</TABLE>
 
- ------------------------
(1) The Transaction Price is given on a per Unit basis. The General Partner does
    not  know  whether  the  transaction  prices  shown  are  before  or   after
    commissions.  However, the  secondary-market firms  providing information to
    Stanger are instructed that, if they act as "principals," the reported price
    per Unit  should include  any mark-ups  and  if they  act as  "agents,"  the
    reported price per Unit should include any commissions, unless the firm acts
    as  a  retail  broker.  The  firms are  further  instructed  not  to include
    commissions paid by retail buyers or sellers to their retail brokers.
 
(2) No trade was reported to Stanger during this quarter.
 
(3) Secondary market  information for  the  third quarter  of  1996 is  not  yet
    available from Stanger.
 
                                      119
<PAGE>
                     BUSINESS AND PROPERTIES OF THE COMPANY
 
HISTORY OF THE COMPANY
 
    The Company began operations as a REIT through the Consolidation on March 1,
1994 of 17 publicly held real estate limited partnerships that were sponsored by
the  Management Company. In order to create  a fully integrated company and more
closely align  the interests  of management  with stockholders,  the  Management
Company  merged  with the  Company on  March  24, 1995.  In connection  with the
Management Company Merger, the outstanding shares of the Management Company were
converted into 1,266,705 newly issued shares of Common Stock, subject to certain
adjustments. The Management Company  stockholders may receive additional  shares
over the five years following the Management Company Merger as consideration for
certain  partnership interests, including interests  in the Partnerships held by
the Management  Company that  were not  valued  at the  time of  the  Management
Company  Merger.  As a  result  of the  Management  Company Merger,  the Company
internalized the expertise and experience of the Management Company's  personnel
that cover all aspects of the self storage industry.
 
    The  Management Company  was incorporated in  1972 by Charles  K. Barbo, the
Company's Chairman,  President  and  Chief Executive  Officer,  to  sponsor  and
operate real estate investments. From its formation until the Management Company
Merger,  the Management  Company was involved  in the organization  of 20 public
partnerships, which  raised in  the aggregate  approximately $600  million  from
approximately  80,600 investors with the objective of investing in the ownership
and  operation  of  self  storage  properties.  The  majority  of  these  public
partnerships  were  consolidated  into  the Company  in  the  Consolidation. The
Company is an independent, fully integrated real estate operating company,  with
in-house  expertise covering all aspects of the self storage industry, including
real  estate  development,  acquisition  and  disposition,  project  design  and
consulting,  full-service property management capabilities, marketing, personnel
management, legal, accounting and finance.
 
THE PROPERTIES
 
    The Company owned and  operated, as of June  30, 1996, directly and  through
its  subsidiaries and joint ventures, 185  self storage properties located in 19
states and  Europe. In  addition, the  Company  owns two  business parks  and  a
commercial building located in the Seattle metropolitan area. The Company's self
storage  properties are designed to offer  accessible storage space for personal
and business uses. Individuals typically  rent individual units in self  storage
properties  for storage  of personal  belongings such  as furniture, appliances,
motor vehicles, boats  and other  household and  recreational goods.  Businesses
typically  rent  space  for  storage of  business  property  such  as equipment,
seasonal goods, records and fixtures. The Company believes that it is  desirable
to have commercial customers because they tend to rent larger units and stay for
longer  terms,  are  more  reliable  payers  and  are  less  sensitive  to price
increases.  Accordingly,  the  Company   has  marketing  programs  that   target
commercial  users.  The  Company  estimates that  commercial  users  account for
approximately 35% to 40% of its total occupancy.
 
    The  Company's  self  storage  properties  are  divided  into  a  number  of
self-enclosed  rental units that generally  range in size from  25 to 360 square
feet. Many properties have uncovered  storage outside the buildings for  parking
motor  vehicles, boats,  campers and  other similar  items suitable  for outside
storage. Approximately  20%  of the  properties  owned by  the  Company  include
climate-controlled  storage units for which the Company usually charges rents at
substantial premiums.
 
    Customers  of  self  storage   properties  are  generally  responsible   for
delivering  and retrieving their  goods. Generally, customers  can access leased
space directly by automobile  or truck, but some  properties, in particular  the
multistory  buildings, have separate  loading docks and  elevators available for
delivery and retrieval of stored goods. Customers generally have access to their
unit without additional charge during  normal business hours and control  access
to  such space through the use of  padlocks. The Company offers truck rentals at
the majority of its properties. The Company believes it
 
                                      120
<PAGE>
is the largest leasing agent of Ryder trucks in the United States, based on  the
number  of truck  rental locations.  In addition  to truck  rentals, the Company
sells locks, boxes and packing and storage materials at its stores.
 
    The leasing,  maintenance and  operation  of the  Company's stores  are  the
responsibility  of  store  managers.  Property security  is  provided  through a
variety of systems that may include, among others, on site personnel, electronic
devices such as intrusion and fire  alarms, access controls, video and  intercom
surveillance devices, property fencing and lighting.
 
    Although  the Company's stores  range considerably in  size, most properties
consist of one or more single-story buildings that are located on a site of  1.5
to  5 acres.  The smallest  store has  approximately 25,000  net rentable square
feet, while  the largest  store has  approximately 300,000  net rentable  square
feet.  The properties generally  are constructed with  concrete block or tilt-up
concrete panels, with  steel columns or  precast concrete columns  that rest  on
concrete  footings and slabs, and have built-up tar roofs or pitched truss roofs
with shingles or  standing seam metal  roofs. The interior  walls generally  are
constructed with metal studs and partitions or other construction materials that
are  secure but readily  movable. The parking areas  and driveways are generally
paved with asphalt or cement. All  stores have fencing, floodlights, sliding  or
swinging gates and certain additional security devices mentioned above.
 
    In  some cases, multistory buildings able  to bear substantial weight loads,
such as warehouses and newspaper plants,  have been converted into self  storage
properties. In addition, similar multistory buildings for self storage have been
constructed  in dense urban areas where land costs, zoning and other development
considerations make  it impractical  or  undesirable to  construct  single-story
buildings.
 
    Storage  units are  usually rented  on a  month-to-month basis.  The Company
estimates that the average rental stay for a tenant is approximately 1.5  years.
This average is comprised of the rental periods of business tenants, who tend to
stay  in rented units for longer periods (averaging  2 to 3 years), and those of
residential customers, who  tend to  stay in  rented units  for shorter  periods
(averaging  six months to  a year). Rental income  from leased space constitutes
the primary revenue  from such  properties, but additional  revenue is  received
from  incidental services rendered at the properties, such as lock and box sales
and truck rentals. Rental rates vary substantially depending on the size of  the
storage space and the property location and quality of the property.
 
    The  following table  provides information  regarding the  year developed or
acquired (by  the  Company  or  by  one of  the  partnerships  included  in  the
Consolidation,  as the case may be), year built, approximate net rentable square
feet and acreage of each of the self storage properties and business parks owned
by the Company  as of  June 30, 1996.  The Company  owns additional  undeveloped
properties not reflected in the table.
 
<TABLE>
<CAPTION>
                                                                               APPROXIMATE
                               PROPERTY      PROPERTY     OWNED      YEAR     NET RENTABLE
      PROPERTY NAME            LOCATION        STATE      SINCE      BUILT     SQUARE FEET     ACREAGE
- -------------------------  ----------------  ---------  ---------  ---------  -------------  -----------
<S>                        <C>               <C>        <C>        <C>        <C>            <C>
Chandler                   Chandler             AZ           1986       1986       69,000           4.0
Mesa                       Mesa                 AZ           1987       1985      103,000           4.8
Phoenix                    Phoenix              AZ           1985       1984       77,000           2.7
Phoenix East               Phoenix              AZ           1987       1984       66,000           2.0
Scottsdale                 Scottsdale           AZ           1985    1976/85       47,000           3.0
Scottsdale North           Scottsdale           AZ        1985/87       1985      112,000           4.1
Tempe                      Tempe                AZ           1984       1976       54,000           3.0
Warner (1)                 Mesa                 AZ           1995       1985       62,000           3.1
Colton                     Colton               CA           1985       1984       73,000           3.8
Culver City                Los Angeles          CA           1988       1989       76,000           1.4
Daly City                  Daly City            CA           1995       1989       96,000           5.2
El Cajon                   El Cajon             CA           1986       1977      127,000           6.0
El Cerrito                 Richmond             CA           1986       1987       62,000           1.5
Fontana Sierra             Fontana              CA           1987    1980/85       84,000           3.6
Hayward                    Hayward              CA           1985       1983       48,000           2.8
</TABLE>
 
                                      121
<PAGE>
<TABLE>
<CAPTION>
                                                                               APPROXIMATE
                               PROPERTY      PROPERTY     OWNED      YEAR     NET RENTABLE
      PROPERTY NAME            LOCATION        STATE      SINCE      BUILT     SQUARE FEET     ACREAGE
- -------------------------  ----------------  ---------  ---------  ---------  -------------  -----------
Huntington Beach           Huntington           CA           1988       1986       91,000           3.3
                           Beach
<S>                        <C>               <C>        <C>        <C>        <C>            <C>
Kearney-Balboa             San Diego            CA           1986       1984       94,000           2.3
La Habra                   La Habra             CA           1986    1979/91       97,000           7.1
Mountain View              Mountain View        CA           1987       1986       29,000           0.7
Palo Alto                  Palo Alto            CA           1986       1987       49,000           1.4
S. San Francisco           San Francisco        CA           1987       1985       57,000           2.1
Santa Ana                  Santa Ana            CA           1986    1975/86      168,000           8.1
Solana Beach (3)           Solana Beach         CA           1987       1984       95,000           4.5
Sunnyvale                  Sunnyvale            CA           1986    1974/75      122,000           6.5
Union City                 Hayward              CA           1985       1985       42,000           2.9
Westwood                   Santa Monica         CA           1986       1988       38,000           0.3
Lakewood                   Golden               CO           1986       1985       67,000           2.7
Northglenn                 Northglenn           CO           1987       1979       75,000           5.5
Tamarac                    Denver               CO           1984       1977       25,000           1.9
Thornton                   Denver               CO           1984       1984       41,000           2.4
Windermere                 Littleton            CO           1984    1977/79       83,000           5.3
Military Trail             West Palm Beach      FL           1987       1981      124,000           9.4
Oakland Park               Ft. Lauderdale       FL           1985    1974/78      292,000          13.4
Seminole                   Seminole             FL           1986    1984/85       61,000           2.7
West Palm Beach            West Palm Beach      FL           1987       1975      163,000          11.8
Ansley Park                Atlanta              GA           1995       1991       69,000           1.4
Brookhaven                 Atlanta              GA           1995       1992       66,000           2.0
Decatur                    Atlanta              GA           1995       1992       63,000           2.5
Gwinnett                   Lawrenceville        GA           1995       1996       56,000           4.4
Perimeter                  Atlanta              GA           1995       1996       61,000           3.3
Roswell                    Roswell              GA           1986       1986       57,000           3.8
Alsip                      Alsip                IL           1982       1980       66,000           4.6
Bridgeview                 Bridgeview           IL           1985       1983       75,000           4.1
Dolton                     Calumet City         IL           1982       1979       64,000           3.0
Hillside                   Hillside             IL           1988       1988       65,000           5.3
Lisle                      Lisle                IL           1986    1976/86       52,000           3.4
Lombard                    Lombard              IL           1982       1980       52,000           3.1
Oak Forest                 Orland Park          IL           1995       1991       63,000           3.9
Rolling Meadows            Rolling Meadows      IL           1982       1980       60,000           4.5
Schaumburg                 Schaumburg           IL           1982       1980       71,000           4.3
Willowbrook                Willowbrook          IL           1986    1979/82       44,000           3.3
Carmel                     Carmel               IN           1995       1996       61,000           4.3
College Park               Indianapolis         IN           1986       1984       70,000           6.0
Glendale                   Indianapolis         IN           1986       1985       60,000           5.6
Briggs Chaney              Silver Spring        MD           1994       1987       28,000           2.0
Clinton                    Clinton              MD           1986       1985       31,000           2.0
Crofton                    Gambrills            MD           1988       1985       40,000           2.1
Frederick                  Frederick            MD           1994       1987       32,000           1.7
Gaithersburg               Gaithersburg         MD           1994       1986       57,000           5.4
Germantown                 Germantown           MD           1994       1988       45,000           1.9
Laurel                     Laurel               MD           1988       1984       30,000           2.0
Oxon Hill                  Ft. Washington       MD           1994       1987       28,000           1.3
Suitland                   Suitland             MD           1987       1985       44,000           2.7
Ann Arbor                  Ann Arbor            MI           1988       1977       62,000           3.9
Canton (4)                 Canton               MI           1988       1986       58,000           3.3
Fraser (4)                 Fraser               MI           1988       1985       73,000           5.2
Grand Rapids               Grand Rapids         MI           1983       1978       46,000           3.2
Kalamazoo                  Kalamazoo            MI           1980       1980       43,000           3.0
Lansing                    Lansing              MI           1983    1978/79       41,000           2.5
Livonia (4)                Livonia              MI           1988       1985       67,000           4.8
Madison Heights            Madison Heights      MI           1995       1977       66,000           4.1
</TABLE>
 
                                      122
<PAGE>
<TABLE>
<CAPTION>
                                                                               APPROXIMATE
                               PROPERTY      PROPERTY     OWNED      YEAR     NET RENTABLE
      PROPERTY NAME            LOCATION        STATE      SINCE      BUILT     SQUARE FEET     ACREAGE
- -------------------------  ----------------  ---------  ---------  ---------  -------------  -----------
Plymouth                   Canton               MI           1985       1979       75,000           5.3
                           Township
<S>                        <C>               <C>        <C>        <C>        <C>            <C>
Southfield                 Southfield           MI           1983       1976       77,000           4.3
Taylor                     Taylor               MI           1995       1980       66,000           4.2
Troy East                  Troy                 MI           1981    1975/77       79,000           4.8
Troy West                  Troy                 MI           1983       1979       88,000           5.2
Walled Lake                Walled Lake          MI        1985/89       1984       68,000           4.3
Warren (4)                 Warren               MI           1988       1985       68,000           4.6
Bellefontaine              St. Louis            MO           1985       1979       45,000           4.9
Brentwood                  Brentwood            MO           1988       1977       53,000           3.4
Olive Innerbelt            St. Louis            MO           1987    1952/86       94,000           2.5
Capital Blvd               Raleigh              NC           1994       1984       35,000           2.1
Cary                       Cary                 NC           1994       1984       62,000           4.7
Garner                     Garner               NC           1994       1987       28,000           3.1
Glenwood                   Raleigh              NC           1994       1983       31,000           1.9
Morrisville                Morrisville          NC           1994       1988       40,000           3.3
Old Bridge                 Matawan              NJ           1987       1987       78,000           6.1
Northern                   Long Island City     NY           1987       1940       78,000           1.9
Gold                       Brooklyn             NY           1986       1940      108,000           0.4
Utica                      Brooklyn             NY           1986       1964       71,000           1.1
Van Dam                    Long Island City     NY           1986       1925       63,000           0.5
Yonkers                    Yonkers              NY           1986       1928      102,000           1.6
Barbur Boulevard           Portland             OR           1995       1993       67,000           2.8
Beaverton                  Beaverton            OR           1985       1974       26,000           2.0
Denny Road                 Beaverton            OR           1989       1988       65,000           6.2
Gresham                    Gresham              OR           1995       1996       64,000           4.4
King City                  Tigard               OR           1987       1986       84,000           4.9
Liberty Road               Salem                OR           1995       1993       54,000           4.4
Oregon City                Portland             OR           1995       1992       57,000           3.2
Portland                   Portland             OR           1988       1988       49,000           2.1
Salem                      Salem                OR           1983    1979/81       67,000           3.8
Airport                    Philadelphia         PA           1986       1985      101,000           6.7
Edgmont                    Philadelphia         PA           1995       1992       64,000           5.5
West Chester (3)           West Chester         PA           1986       1980       87,000           7.0
Franklin (5)               Nashville            TN           1995       1995       55,000           3.3
Hermitage (6)              Nashville            TN           1995       1995       68,000          19.0
Medical Center (7)         Nashville            TN           1994       1995       60,000           2.3
Arlington                  Arlington            TX           1986       1984       57,000           2.7
Bandera Road               San Antonio          TX           1988       1981       76,000           3.6
Bedford                    Bedford              TX           1985       1984       69,000           2.7
Beltline Rd.               Irving               TX           1989    1985/86       89,000           6.3
Blanco Road                San Antonio          TX           1988    1989/91       66,000           3.6
Euless Blvd.               Hurst                TX           1987       1974       68,000           4.7
Federal                    Houston              TX           1988       1988       55,000           3.4
Fredricksburg              San Antonio          TX           1987    1978/82       82,000           4.5
Greenbriar                 Houston              TX           1989       1988       60,000           1.8
Hill Country Village       San Antonio          TX           1985       1982       79,000           4.0
Hillcroft (3)              Houston              TX           1991       1988       59,000           3.4
Imperial Valley            Houston              TX           1988       1987       54,000           3.1
Irving                     Irving               TX           1985    1975/84       78,000           4.2
Kingwood                   Kingwood             TX           1988       1988       54,000           3.3
MacArthur Blvd.            Irving               TX           1986       1984       63,000           7.2
MacArthur Crossing         Irving               TX           1995       1996       66,000           4.1
Medical Center             Houston              TX           1989       1989       57,000           2.6
North Austin               Austin               TX           1986       1982       76,000           5.9
Park Cities East           Dallas               TX           1995       1995       56,000           4.3
Parker Road                Plano                TX           1995       1995       46,000           3.5
</TABLE>
 
                                      123
<PAGE>
<TABLE>
<CAPTION>
                                                                               APPROXIMATE
                               PROPERTY      PROPERTY     OWNED      YEAR     NET RENTABLE
      PROPERTY NAME            LOCATION        STATE      SINCE      BUILT     SQUARE FEET     ACREAGE
- -------------------------  ----------------  ---------  ---------  ---------  -------------  -----------
San Antonio NE             San Antonio          TX           1985       1982       74,000           3.6
<S>                        <C>               <C>        <C>        <C>        <C>            <C>
South Cooper               Arlington            TX           1995       1996       61,000           3.7
South Hwy (6)              Houston              TX           1995       1995       53,000           4.1
Sugarland                  Sugarland            TX           1988       1987       55,000           3.0
Thousand Oaks              San Antonio          TX           1986       1987       53,000           2.9
Universal City (1)         San Antonio          TX           1995       1985       77,000           5.1
Westheimer                 Houston              TX           1986       1977       73,000           3.7
Woodlands                  Houston              TX           1988       1988       64,000           3.8
Bayside                    Virginia Beach       VA           1988       1984       28,000           1.7
Cedar Road                 Chesapeake           VA           1994       1989       36,000           2.1
Charlottesville            Charlottesville      VA           1994       1984       32,000           2.1
Crater Road                Petersburg           VA           1994       1987       36,000           3.8
Dale City                  Dale City            VA           1994       1986       31,000           1.6
Fairfax                    Fairfax              VA           1986       1980       62,000           5.6
Falls Church               Falls Church         VA           1987       1988       93,000           1.5
Gainesville                Gainesville          VA           1994       1988       31,000           2.0
Herndon                    Herndon              VA           1988       1985       39,000           3.0
Holland Road               Virginia Beach       VA           1994       1985       34,000           3.9
Jefferson Davis Hwy        Richmond             VA           1994       1990       35,000           5.2
Kempsville                 Virginia Beach       VA           1989       1985       33,000           2.0
Laskin Road                Virginia Beach       VA           1994       1984       39,000           2.5
Manassas East              Manassas             VA           1988       1984       35,000           2.0
Manassas West              Manassas             VA           1988       1985       35,000           1.5
Newport News S.            Newport News         VA        1985/92       1985       60,000           3.9
North Richmond             Richmond             VA           1988       1984       37,000           2.6
Princess Anne Road         Virginia Beach       VA           1994       1985       40,000           2.2
Temple Avenue              Petersburg           VA           1994       1989       34,000           4.0
Virginia Beach             Virginia Beach       VA           1989       1985       36,000           2.3
Auburn                     Auburn               WA           1995       1996       62,000           7.3
Aurora North               Seattle              WA           1986       1978       58,000           1.6
Bellevue East and West     Bellevue             WA           1984       1975      165,000          10.8
(8)
Bellingham                 Bellingham           WA           1981       1981       73,000           5.7
Burien                     Seattle              WA           1985       1974       92,000           5.3
Capitol Hill (9)           Seattle              WA           1987       1988       76,000           0.7
Downtown Seattle (10)      Seattle              WA           1986       1912       28,000           0.3
East Lynnwood              Lynnwood             WA           1986       1978       80,000           3.8
Edmonds                    Edmonds              WA           1984    1974/75      120,000           6.5
Everett                    Everett              WA           1981       1978       64,000           4.2
Factoria                   Bellevue             WA           1984       1984       57,000           3.8
Federal Way                Federal Way          WA           1984       1975      134,000           5.7
Fife (11)                  Tacoma               WA           1984       1977       64,000           3.9
Highland Hill              Tacoma               WA           1981       1982       60,000           3.9
Interbay                   Seattle              WA           1987       1988       80,000           0.4
Issaquah                   Issaquah             WA           1985       1986       56,000           4.7
Lake City (1)              Seattle              WA           1995       1987       51,000           1.1
North Spokane              Spokane              WA           1984       1976       76,000           4.1
Renton                     Renton               WA           1984    1979/89       80,000           4.5
Sea-Tac                    Seattle              WA           1985       1979       60,000           3.0
Seattle                    Seattle              WA           1983       1979       79,000           4.5
Smokey Point               Arlington            WA           1987    1984/87       34,000           2.2
South Hill                 Seattle              WA           1995       1980       44,000           2.8
South Tacoma               Tacoma               WA           1987       1975       46,000           3.1
Southcenter                Renton               WA           1985       1979       67,000           4.1
Tacoma Interstate (11)     Tacoma               WA       87/88/91    1979/81      128,000          12.2
Totem Lake                 Kirkland             WA           1984       1978       61,000           2.6
Vancouver Mall             Vancouver            WA           1980       1982       46,000           3.3
West Seattle               Seattle              WA           1980       1981       48,000           3.4
Woodinville                Woodinville          WA           1984    1982/84       70,000           3.5
Forest (2)                 Brussels           Belgium        1995       1995       49,000           0.4
</TABLE>
 
                                      124
<PAGE>
<TABLE>
<CAPTION>
                                                                               APPROXIMATE
                               PROPERTY      PROPERTY     OWNED      YEAR     NET RENTABLE
      PROPERTY NAME            LOCATION        STATE      SINCE      BUILT     SQUARE FEET     ACREAGE
- -------------------------  ----------------  ---------  ---------  ---------  -------------  -----------
Molenbeek (2)              Brussels           Belgium        1995       1995       34,000           0.5
<S>                        <C>               <C>        <C>        <C>        <C>            <C>
Waterloo (2)               Waterloo           Belgium        1995       1995       86,000           3.5
</TABLE>
 
- ------------------------------
 (1) The Company owns a 59.5% interest in this property.
 
 (2) The Company owns an 85.6% interest in this property.
 
 (3)  The  Company does  not have  fee title,  but has  a long-term  lease, with
     respect to the land on which property is located.
 
 (4) Through its ownership in  SJP II (a joint  venture with IDS1), the  Company
     owns a 30% interest in this property.
 
 (5) The Company owns a 92% interest in this property.
 
 (6) The Company owns a 50% interest in this property.
 
 (7) The Company owns a 67% interest in this property.
 
 (8) Bellevue East and Bellevue West are now operated as one property.
 
 (9) The Company owns a 90% interest in this property.
 
(10) Property is a commercial building.
 
(11) Property is a business park.
 
    The  following table sets  forth information regarding  weighted average net
rentable square foot occupancy and weighted average annual rent per net rentable
square foot for the domestic self  storage properties owned by the Company  (and
its  predecessors) for the years ended December  31, 1993, 1994 and 1995 and the
six months ended June 30, 1996.
<TABLE>
<CAPTION>
                                                   WEIGHTED AVERAGE OCCUPANCY
                                     ------------------------------------------------------   AVERAGE RENT PER SQUARE FOOT
                                                                                             -------------------------------
                                                  YEAR ENDED
                                                 DECEMBER 31,                 SIX MONTHS         YEAR ENDED DECEMBER 31,
                                     -------------------------------------  ENDED JUNE 30,   -------------------------------
STATE                                  1993(1)       1994         1995           1996         1993(1)     1994       1995
- -----------------------------------  -----------     -----        -----     ---------------  ---------  ---------  ---------
<S>                                  <C>          <C>          <C>          <C>              <C>        <C>        <C>
Arizona............................          97%          91%          84%            80%    $    6.26  $    7.50  $    9.15
California.........................          88           86           85             88          8.85       9.28      10.04
Colorado...........................          96           91           88             81          6.30       7.01       7.52
Florida............................          83           85           83             84          7.67       7.70       8.12
Illinois...........................          91           95           95             93          7.47       7.84       8.30
Michigan...........................          87           91           93             92          6.08       6.66       7.38
New York...........................          80           87           92             89         14.34      14.63      15.14
Oregon.............................          89           93           92             88          6.82       7.22       7.77
Texas..............................          79           87           82             79          7.41       7.63       8.13
Virginia...........................          90           89           90             93          9.40       9.94       8.95
Washington.........................          88           88           89             91          7.58       7.83       8.17
Other..............................          89           92           89             87          7.95       8.53       9.48
                                             --           --           --             --
                                                                                             ---------  ---------  ---------
    Total..........................          87%          89%          88%            87%    $    7.84  $    8.25  $    8.84
                                             --           --           --             --
                                             --           --           --             --
                                                                                             ---------  ---------  ---------
                                                                                             ---------  ---------  ---------
 
<CAPTION>
 
                                     SIX MONTHS
                                     ENDED JUNE
STATE                                 30, 1996
- -----------------------------------  -----------
<S>                                  <C>
Arizona............................   $    9.20
California.........................       10.27
Colorado...........................        8.02
Florida............................        8.32
Illinois...........................        8.53
Michigan...........................        7.96
New York...........................       15.77
Oregon.............................        8.13
Texas..............................        8.17
Virginia...........................        9.26
Washington.........................        8.13
Other..............................       10.08
 
                                     -----------
    Total..........................   $    9.09
 
                                     -----------
                                     -----------
</TABLE>
 
- ------------------------
(1) Calculated as the weighted average  of the original 137 properties owned  by
    the Company.
 
    The  following table sets  forth same store  information regarding aggregate
weighted average net rentable square foot occupancy and weighted average  annual
rent per net rentable square foot for the 137 self storage properties originally
owned  by the Company for the years ended December 31, 1991 through December 31,
1995 and the six months ended June 30, 1996.
 
<TABLE>
<CAPTION>
                                                                     YEAR ENDED DECEMBER 31,                      SIX MONTHS
                                                 ---------------------------------------------------------------  ENDED JUNE
                                                  1991 (1)     1992 (1)     1993 (1)       1994         1995       30, 1996
                                                 -----------  -----------  -----------  -----------  -----------  -----------
<S>                                              <C>          <C>          <C>          <C>          <C>          <C>
Weighted average occupancy.....................         82%          86%          87%          89%          88%          87%
Weighted average rent per square foot..........  $    7.35    $    7.68    $    7.84    $    8.25    $    8.84    $    9.09
</TABLE>
 
- ------------------------
(1) Calculated  as a  simple average  for the  17 partnerships  included in  the
    Consolidation.
 
                                      125
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
COMMON STOCK AND CLASS B COMMON STOCK
 
    The  Company has  authority to  issue 120,000,000  shares of  Class A Common
Stock, par value $.001 per  share, and 500,000 shares  of Class B Common  Stock,
par  value $.001 per share (the "Class B Common Stock"). At August 31, 1996, the
Company had outstanding 24,046,517 shares of Common Stock and 154,604 shares  of
Class  B Common Stock. The following description  of the Common Stock sets forth
certain general terms and provisions of  the Common Stock. The statements  below
describing  the Common  Stock are  in all respects  subject to  and qualified in
their entirety by reference to the  applicable provisions of the Certificate  of
Incorporation and Bylaws.
 
    TERMS.   Subject to the preferential rights of any other shares or series of
stock, holders of Common  Stock will be entitled  to receive dividends when,  as
and  if  declared by  the  Company's Board  of  Directors out  of  funds legally
available therefor. Payment and declaration of dividends on the Common Stock and
purchases of shares of Common  Stock by the Company  will be subject to  certain
restrictions  if the Company fails to pay dividends on any outstanding Preferred
Stock.
See "-- Preferred Stock." Upon any liquidation, dissolution or winding up of the
Company, holders of Common Stock (together with holders of Class B Common Stock)
will be  entitled to  share equally  and  ratably in  any assets  available  for
distribution  to them, after payment  or provision for payment  of the debts and
other liabilities of the Company and the preferential amounts owing with respect
to any outstanding Preferred Stock.  The Common Stock possesses ordinary  voting
rights  for the election of directors and in respect of other corporate matters,
each share entitling the holder thereof to one vote. Holders of Common Stock  do
not have cumulative voting rights in the election of directors, which means that
holders  of more than  50% of all the  shares of the  Company's Common Stock and
Class B Common  Stock voting for  the election  of directors can  elect all  the
directors if they choose to do so and the holders of the remaining shares cannot
elect  any directors. Holders of  shares of Common Stock  do not have preemptive
rights, which  means they  have no  right to  acquire any  additional shares  of
Common  Stock that may be issued by the Company at a subsequent date. All shares
of Common  Stock now  outstanding are,  and additional  shares of  Common  Stock
issued   pursuant  to  the   Mergers  will  be  when   issued,  fully  paid  and
nonassessable, and  no  shares  of  Common  Stock are  or  will  be  subject  to
preemptive or similar rights.
 
    The  Class B Common Stock  has rights substantially similar  to those of the
Common Stock. Each holder of  Class B Common Stock was  entitled to a loan  from
the  Company  in an  amount necessary  to satisfy  the holder's  general partner
capital obligation to certain partnerships that were acquired by the Company  in
the  Consolidation. Each loan is secured by a pledge of the Class B Common Stock
held by the borrowing stockholder. Upon repayment of a portion of the loan, that
portion of  the  Class B  Common  Stock equal  to  the percentage  of  the  loan
principal  repaid  is  released  from  the  pledge  and  is  convertible,  on  a
share-for-share basis, into shares of Common Stock. Class B Common Stock is  not
publicly traded but is transferable upon its release from the pledge.
 
    RESTRICTIONS  ON OWNERSHIP.  For the Company  to qualify as a REIT under the
Code not more than 50% in value  of its outstanding capital stock may be  owned,
actually or constructively, by five or fewer individuals (defined in the Code to
include  certain entities) during the last half of a taxable year. To assist the
Company in meeting this  requirement, the Company has  taken certain actions  to
limit  the beneficial ownership, actually or  constructively, by a single person
or entity of the Company's  outstanding equity securities. See "--  Restrictions
on Transfers of Capital Stock; Excess Stock."
 
    TRANSFER  AGENT.  The registrar and transfer  agent for the Common Stock and
Class B Common Stock is Gemisys Corporation.
 
    STOCKHOLDER RIGHTS PLAN.  Pursuant to the Rights Agreement dated as of March
17, 1994, between  the Company  and Gemisys  Corporation, as  Rights Agent  (the
"Rights  Agreement"), holders  of shares  of the  Common Stock  and the  Class B
Common Stock have certain  rights to purchase shares  of the Company's Series  A
Junior Participating Preferred Stock (the "Junior Preferred Shares") exercisable
only  in certain circumstances (the "Rights"). The Rights, which are represented
by
 
                                      126
<PAGE>
certificates for the Common Stock and  the Class B Common Stock, trade  together
with the Common Stock and the Class B Common Stock until a Distribution Date (as
defined below). Each Right, when it becomes exercisable as described below, will
entitle  the  registered  holder  to  purchase  one  one-hundredth  of  a Junior
Preferred Share  at  $65 per  one  one-hundredth  of a  Junior  Preferred  Share
(subject to adjustment, the "Purchase Price").
 
    Until  the earlier to occur  of (a) 10 days  following a public announcement
that a  person or  group  of affiliated  or  associated persons  (an  "Acquiring
Person")  has acquired  beneficial ownership of  10% or more  of the outstanding
Common Stock and Class B  Common Stock and (b) 10  business days (or such  later
date as may be determined by action of the Company's Board of Directors prior to
such  time as  any person  or group of  affiliated persons  becomes an Acquiring
Person) following the commencement of, or announcement of an intention to  make,
a  tender offer or exchange offer, the consummation of which would result in the
beneficial ownership by a  person or group  of 10% or  more of such  outstanding
Common  Stock  and  Class  B  Common  Stock  (the  earlier  of  such  dates, the
"Distribution Date"), the Rights will be  evidenced, with respect to any of  the
Common  Stock and the Class B Common  Stock certificates outstanding as of March
25, 1994 (the "Rights  Record Date"), by  such Common Stock  and Class B  Common
Stock  certificate, with  a copy  of a Summary  of Rights  to Purchase Preferred
Shares (the "Summary of Rights") attached thereto.
 
    The Rights Agreement provides, that, until the Distribution Date (or earlier
redemption or expiration of the Rights), the Rights will be transferred with and
only with the Common Stock or Class B Common Stock. Until the Distribution  Date
(or earlier redemption or expiration of the Rights), new Common Stock or Class B
Common  Stock certificates issued after the  Rights Record Date upon transfer or
new issuance of Common  Stock or Class  B Common Stock  will contain a  notation
incorporating the Rights Agreement by reference. Until the Distribution Date (or
earlier  redemption or expiration of the  Rights), the surrender for transfer of
any certificates for Common Stock or Class B Common Stock outstanding as of  the
Rights  Record Date,  even without  such notation  or a  copy of  the Summary of
Rights being attached thereto, will also  constitute the transfer of the  Rights
associated with the Common Stock or the Class B Common Stock represented by such
certificate.  As soon as  practicable following the  Distribution Date, separate
certificates evidencing  the Rights  ("Right Certificates")  will be  mailed  to
holders  of record of  the Common Stock and  the Class B Common  Stock as of the
close of business on the Distribution Date, and such separate Right Certificates
alone will evidence the Rights.
 
    The Rights are not exercisable until the Distribution Date. The Rights  will
expire  on March 17, 2004, unless such date is extended or unless the Rights are
earlier redeemed or exchanged by the Company, in each case as described below.
 
    The Purchase Price  payable and  the number  of Junior  Preferred Shares  or
other securities or property issuable upon exercise of the Rights are subject to
adjustment  from time to  time to prevent dilution  (a) in the  event of a stock
dividend on, or a  subdivision, combination or  reclassification of, the  Junior
Preferred  Shares, (b) upon the grant to  holders of the Junior Preferred Shares
of certain rights  or warrants  to subscribe  for or  purchase Junior  Preferred
Shares at a price, or securities convertible into Junior Preferred Shares with a
conversion  price,  less  than  the  then-current  market  price  of  the Junior
Preferred Shares,  or  (c)  upon  the distribution  to  holders  of  the  Junior
Preferred  Shares  of evidences  of  indebtedness or  assets  (excluding regular
periodic cash dividends paid out of  earnings or retained earnings or  dividends
payable in Junior Preferred Shares) or of subscription rights or warrants (other
than those referred to above).
 
    The  number of outstanding Rights and the  number of one one-hundredths of a
Junior Preferred Share issuable upon exercise  of each Right is also subject  to
adjustment  in the event  of a stock  split of the  Common Stock or  the Class B
Common Stock or  a dividend  on the  Common Stock or  the Class  B Common  Stock
payable  in Common Stock or subdivisions,  consolidations or combinations of the
Common Stock or the Class B Common  Stock occurring, in any such case, prior  to
the Distribution Date.
 
                                      127
<PAGE>
    Junior  Preferred Shares  purchasable upon  exercise of  the Rights  will be
redeemable only in accordance with the redemption provisions discussed under "--
Restrictions on Transfers of Capital Stock; Excess Stock." Each holder of Junior
Preferred Shares will be entitled  to a minimum preferential quarterly  dividend
payment of the greater of $1 per share and a per share dividend of 100 times the
aggregate  dividends declared per share of Common Stock or Class B Common Stock.
In the event  of liquidation,  the holders of  Junior Preferred  Shares will  be
entitled  to a minimum preferential liquidation payment of $100 per share or, if
greater, to an aggregate  per share payment of  100 times the aggregate  payment
made  per share of Common  Stock or Class B  Common Stock. Each Junior Preferred
Share will have 100 votes, voting together with the Common Stock and the Class B
Common Stock.  Finally, in  the  event of  any  merger, consolidation  or  other
transaction  in  which shares  of  Common Stock  and  Class B  Common  Stock are
exchanged, each Junior Preferred Share will be entitled to receive 100 times the
amount received per share of Common Stock and Class B Common Stock. These rights
are protected by customary antidilution provisions.
 
    Because of the nature of the Junior Preferred Shares' dividend,  liquidation
and  voting rights,  the value  of the  one one-hundredth  interest in  a Junior
Preferred Share purchasable upon exercise  of each Right should approximate  the
value of one share of Common Stock.
 
    If  any  person or  group  of affiliated  or  associated persons  becomes an
Acquiring Person, proper provision will be made so that each holder of a  Right,
other  than  Rights  beneficially  owned by  the  Acquiring  Person  (which will
thereafter be void),  will thereafter have  the right to  receive upon  exercise
that  number of shares of  Common Stock or Class B  Common Stock having a market
value, as of the date of exercise, of two times the exercise price of the Right.
If  the  Company  is  acquired  in  a  merger  or  other  business   combination
transaction,  or 50%  or more  of its consolidated  assets or  earning power are
sold, proper  provision  will be  made  so that  each  holder of  a  Right  will
thereafter  have  the  right  to  receive,  upon  the  exercise  thereof  at the
then-current exercise price of the Right, that number of shares of common  stock
of the acquiring company that at the time of such transaction will have a market
value of two times the exercise price of the Right.
 
    At  any time after any person or group becomes an Acquiring Person and prior
to the acquisition by  such person or  group of 50% or  more of the  outstanding
Common  Stock and  Class B  Common Stock, the  Company's Board  of Directors may
exchange the Rights (other than Rights owned  by such person or group that  have
become  void), in whole or in part, at  an exchange ratio of one share of Common
Stock or Class B Common Stock, or one one-hundredth of a Junior Preferred  Share
(or  of a  share of a  class or series  of the Company's  Preferred Stock having
equivalent  rights,  preferences   and  privileges),  per   Right  (subject   to
adjustment).
 
    With  certain  exceptions,  no  adjustment in  the  Purchase  Price  will be
required until cumulative adjustments  require an adjustment of  at least 1%  in
such Purchase Price. No fractional Junior Preferred Shares will be issued (other
than  fractions that  are integral  multiples of  one one-hundredth  of a Junior
Preferred  Share,  which  may,  at  the  Company's  election,  be  evidenced  by
depositary  receipts) and, in lieu  thereof, an adjustment in  cash will be made
based on the market price of the Junior Preferred Shares on the last trading day
prior to the date of exercise.
 
    At any time prior to any person  or group becoming an Acquiring Person,  the
Company's Board of Directors may redeem the Rights in whole, but not in part, at
the  price  of  $.0001  per  Right, with  adjustments  for  stock  splits, stock
dividends or other similar transactions (the "Redemption Price"). The redemption
of the Rights may be  made effective at such time,  on such basis and with  such
conditions  as  the Company's  Board  of Directors  in  its sole  discretion may
establish. Immediately upon any redemption of the Rights, the right to  exercise
the Rights will terminate and the only right of the holders of Rights will be to
receive the Redemption Price.
 
    The  terms of the Rights may be  amended by the Company's Board of Directors
without the consent  of the  holders of the  Rights, including  an amendment  to
lower certain 10% thresholds described above to not less than the greater of (a)
the  sum of .001% and the largest percentage of the outstanding Common Stock and
Class  B  Common   Stock  then  known   to  the  Company   to  be   beneficially
 
                                      128
<PAGE>
owned  by any person or  group of affiliated persons  and (b) 9.8%, except that,
from and after  such time as  any person  or group of  affiliated or  associated
persons  becomes an Acquiring Person, no such amendment may adversely affect the
interests of the holders of the Rights.
 
    Until a Right is exercised, the holder thereof, as such, will have no rights
as a stockholder  of the Company,  including, without limitation,  the right  to
vote or to receive dividends.
 
    The  Rights  have  certain  antitakeover  effects.  The  Rights  will  cause
substantial dilution to a person or  group that attempts to acquire the  Company
without  conditioning the offer on substantially  all the Rights being acquired.
The Rights will  not interfere  with any  merger or  other business  combination
approved  by  the Company's  Board  of Directors  since  the Company's  Board of
Directors may, at its option, at any time prior to any person or group  becoming
an  Acquiring Person,  redeem all, but  not less than  all, the then-outstanding
Rights at the Redemption Price.
 
PREFERRED STOCK
 
    The Company is authorized to issue 40,000,000 shares of Preferred Stock, par
value $.001  per share,  of which  no shares  are outstanding.  The Company  has
designated  2,800,000  shares of  the Preferred  Stock  as the  Junior Preferred
Shares issuable  in connection  with the  Rights Agreement  discussed under  "--
Common Stock and Class B Common Stock -- Stockholder Rights Plan." The following
description  of  the  Preferred  Stock  sets  forth  certain  general  terms and
provisions of the Preferred Stock. The statements below describing the Preferred
Stock are  in  all  respects subject  to  and  qualified in  their  entirety  by
reference  to the applicable provisions of  the Certificate of Incorporation and
Bylaws.
 
    Shares of Preferred Stock  may be issued  from time to time  in one or  more
series as authorized by the Company's Board of Directors. Subject to limitations
prescribed  by  the  Delaware General  Corporation  Law and  the  Certificate of
Incorporation, the Company's Board of Directors is authorized to fix the  number
of   shares  constituting  each  series  of  Preferred  Stock  as  well  as  the
designations and powers,  preferences and relative,  participating, optional  or
other  special rights  and qualifications,  limitations or  restrictions of each
series. The  Board of  Directors or  a committee  thereof is  authorized to  fix
provisions  for each  series of  Preferred Stock  concerning voting, redemption,
dividends, dissolution or  the distribution of  assets, conversion or  exchange,
and other matters fixed by resolution. The Preferred Stock will, when issued, be
fully paid and nonassessable and will have no preemptive rights.
 
RESTRICTIONS ON TRANSFERS OF CAPITAL STOCK; EXCESS STOCK
 
    For the Company to qualify as a REIT under the Code, among other things, not
more  than 50% in value of its  outstanding capital stock may be owned, actually
or constructively, by five or fewer individuals (defined in the Code to  include
certain entities) during the last half of a taxable year, and such capital stock
must  be beneficially owned by 100 or more persons during at least 335 days of a
taxable year of 12 months  or during a proportionate  part of a shorter  taxable
year. To ensure that the Company remains qualified as a REIT, the Certificate of
Incorporation,  subject  to certain  exceptions, provides  that the  Company may
prevent the  transfer  and/or call  for  redemption  of shares  of  the  Company
(whether Common Stock, Class B Common Stock or Preferred Stock) if more than 50%
of the outstanding shares would be owned, actually or constructively, by five or
fewer persons (defined to include individuals, corporations, partnerships, joint
ventures  and  similar  entities)  or  if  one  person  would  own,  actually or
constructively, more than 9.8% of the  total outstanding shares (or such  higher
percentage  as  may  be determined  by  the  Company's Board  of  Directors (the
"Ownership Limit")). In addition, the Company may prevent such transfers  and/or
call  for  redemption  of  such  shares  if  the  Company's  Board  of Directors
determines in good faith that the shares have or may become concentrated to  the
extent  that may prevent  the Company from  qualifying as a  REIT. See "Material
Federal Income  Tax Considerations  -- Taxation  of  the Company  as a  REIT  --
Requirements  for Qualification." Any class or  series of Preferred Stock may be
subject to these restrictions if so stated in the resolutions providing for  the
issuance  of such Preferred Stock. Any  corporate investor wishing to acquire or
own more than 9.8%  of the total outstanding  shares may petition the  Company's
Board  of Directors in writing for approval. The Company's Board will grant such
request unless it determines in good faith that the acquisition or ownership  of
such shares would jeopardize the Company's
 
                                      129
<PAGE>
qualification  as a  REIT under existing  federal tax laws  and regulations. Any
corporate investor intending to acquire shares in excess of the Ownership  Limit
must  give written notice  to the Company  of the proposed  acquisition no later
than the date on which the transaction occurs and must furnish such opinions  of
counsel, affidavits, undertakings, agreements and information as may be required
by  the  Company's Board  of Directors  to  evaluate or  to protect  against any
adverse effect of  the transfer.  Notwithstanding the  foregoing, the  Company's
Board  of Directors is not  required to grant a  request to adjust the Ownership
Limit if the  Company's Board of  Directors believes, based  on advice of  legal
counsel,  that the granting of  such request would cause  the Company's Board of
Directors to breach its fiduciary duties to the stockholders of the Company.
 
    If, despite the restrictions noted above, any person acquires shares of  the
Company's Common Stock and Class B Common Stock in excess of the Ownership Limit
(applying  certain constructive ownership provisions),  the shares most recently
acquired by such person in excess  of the Ownership Limit will be  automatically
exchanged  for  an  equal number  of  shares  of Excess  Stock.  The  Company is
authorized to issue  160,000,000 shares  of Excess  Stock, par  value $.001  per
share.  Pursuant to the Company's Certificate of Incorporation, shares of Excess
Stock have the  following characteristics: (a)  owners of Excess  Stock are  not
entitled  to exercise voting rights with respect to the Excess Stock; (b) Excess
Stock shall not be  deemed outstanding for purposes  of determining a quorum  at
any  annual or special meeting of stockholders; and (c) Excess Stock will not be
entitled to any  dividends or  other distributions.  Any person  who becomes  an
owner  of  Excess Stock  is obligated  to immediately  give the  Company written
notice of  such fact  and certain  information required  by the  Certificate  of
Incorporation.  Excess Stock is also deemed to have been offered for sale to the
Company or its designee for a period of 120 days from the later of (i) the  date
of  the transfer that created the Excess  Stock if the Company has actual notice
that such transfer  created the  Excess Stock  and (ii)  the date  on which  the
Company's Board of Directors determines in good faith that the transfer creating
the Excess Stock has occurred. The Company has the right during such time period
to  accept  the deemed  offer or,  in  the Board  of Directors'  discretion, the
Company may acquire and sell, or cause the owner to sell, the Excess Stock.  The
price  for the Excess Stock will  be the lesser of (y)  the closing price of the
shares exchanged into Excess Stock on  the national stock exchange on which  the
shares are listed as of the date the Company or its designee acquires the Excess
Stock  or, if  no such price  is available, as  determined in good  faith by the
Company's Board of Directors and  (z) the price per share  paid by the owner  of
the  shares that were exchanged  into Excess Stock or,  if no purchase price was
paid, the  fair market  value  of such  shares on  the  date of  acquisition  as
determined in good faith by the Company's Board of Directors. Upon such transfer
or  sale, the Excess Stock  will automatically convert to  Common Stock with all
voting and  dividend  rights  effective  as of  the  date  of  such  conversion;
provided,  however, that  the owner  will not  be entitled  to receive dividends
payable with respect to Common Stock for the period during which the shares were
Excess Stock.
 
    All certificates of Common Stock and Class B Common Stock, any other  series
of the Company's Common Stock or Class B Common Stock and any class or series of
Preferred  Stock  will bear  a legend  referring  to the  restrictions described
above. All persons who own a  specified percentage (or more) of the  outstanding
capital  stock of the Company must file an affidavit with the Company containing
information regarding their  ownership of  stock as  set forth  in the  Treasury
Regulations.  Under current Treasury Regulations,  the percentage is set between
 .5% and 5%,  depending on  the number  of record  holders of  capital stock.  In
addition,  each stockholder  shall upon  demand be  required to  disclose to the
Company in writing  such information with  respect to the  direct, indirect  and
constructive ownership of shares of capital stock of the Company as the Board of
Directors  deems necessary to comply with  the provisions of the Code applicable
to a  REIT,  to  comply  with  the  requirements  of  any  taxing  authority  or
governmental agency or to determine any such compliance.
 
    This  ownership limitation may have the  effect of precluding acquisition of
control of the Company by a third party unless the Board of Directors determines
that maintenance  of REIT  status is  no longer  in the  best interests  of  the
Company.
 
                                      130
<PAGE>
                       DISSENTERS' RIGHTS OF UNITHOLDERS
 
    The following is a summary of the rights of Unitholders who dissent from the
Mergers.  The summary does  not purport to  be complete and  is qualified in its
entirety  by  reference  to  Section  25.10.900  et  seq.  of  the  WULPA   (the
"Dissenters' Rights Statute"), a copy of which is attached as Appendix E to this
Proxy  Statement/Prospectus). Holders  of Common Stock  will not  be entitled to
dissenters' rights as a result of the  Mergers because they are not entitled  to
vote on the Mergers.
 
    Any  Unitholder contemplating the exercise of dissenters' rights is urged to
review the full text of the Dissenters' Rights Statute. The procedures set forth
in such Statute must be followed exactly or dissenters' rights may be lost.
 
    A  Unitholder  who  properly  follows  the  procedures  for  dissenting  and
demanding  payment  for his  or  her Units  pursuant  to the  Dissenters' Rights
Statute may be entitled to receive in cash the "fair value" of his or her  Units
plus  accrued interest in lieu of  the consideration provided in the Acquisition
Agreement. The "fair value" of a dissenting Unitholder's Units will be the value
of the Units immediately prior to the Effective Time. The "fair value" could  be
more  than, equal to or less than  the value of the consideration the Unitholder
would have received pursuant to the Acquisition Agreement if the Unitholder  had
not  dissented. In  the event the  dissenting Unitholder and  the Company cannot
agree on the "fair value" of the dissenter's Units, "fair value" may  ultimately
be determined by a court in an appraisal proceeding.
 
    Not  less than ten days prior to the approval of the Merger, the Partnership
must send a  written notice to  all Unitholders entitled  to approve the  Merger
that they may be entitled to assert dissenters' rights and include a copy of the
Dissenters' Rights Statute. To properly exercise dissenters' rights with respect
to  the  Merger and  to  be entitled  to  payment under  the  Dissenters' Rights
Statute, a Unitholder must, among other things, not vote in favor of the  Merger
and,  upon receipt  of a dissenters'  notice from the  Partnership (as described
below), timely deliver a demand for payment.  A VOTE AGAINST IS NOT IN ITSELF  A
SUFFICIENT  EXERCISE OF DISSENTERS' RIGHTS. Any Unitholder who wishes to dissent
and who executes and returns the  accompanying proxy must either vote  "against"
or  "abstain" as to his or her Partnership's participation in the Merger. If the
Unitholder returns a  signed ballot  without voting, or  votes in  favor of  the
Merger,  the Unitholder will be deemed to have voted in favor of the Merger, and
the Unitholder  will lose  any dissenters'  rights. Within  ten days  after  the
approval  of the Merger, the Partnership  will send a written dissenters' notice
to each Unitholder who  satisfied the requirements  above, indicating where  the
payment  demand must be sent and informing Unitholders as to the extent transfer
of the Units will be restricted. Such notice will include, among other things, a
form of payment demand and  the date by which  the Partnership must receive  the
payment  demand, which date may not  be less than 30 or  more than 60 days after
the dissenters'  notice is  delivered. Unitholders  who fail  to file  a  timely
written  intent to demand  payment or who vote  in favor of  the approval of the
Acquisition Agreement  and the  transactions contemplated  thereby will  not  be
entitled to receive the dissenters' notice and will be bound by the terms of the
Acquisition Agreement.
 
    Within  30  days after  the later  of the  Effective Time  and the  date the
payment demand is received,  each Partnership will pay  each dissenter who is  a
Unitholder  of that Partnership  and who complied with  the conditions above the
amount that the Partnership estimates to be the fair value of his or her  Units,
plus  accrued interest. The payment must  be accompanied by, among other things,
(i) copies of the Partnership's financial statements for the most recent  fiscal
year, (ii) an explanation of how the Partnership estimated the fair value of the
Units  and how  the accrued  interest was calculated,  (iii) a  statement of the
dissenters' right to demand  payment and (iv) a  copy of the Dissenters'  Rights
Statute.
 
                                      131
<PAGE>
    A  dissenter may  notify the Partnership  in writing of  the dissenter's own
estimate of the fair value of the  dissenter's Units and the amount of  interest
due, and demand payment of the dissenter's estimate, less any payment made, if:
 
        (a)  the dissenter believes that  the amount paid is  less than the fair
    value of  the dissenter's  Units or  that the  interest due  is  incorrectly
    calculated;
 
        (b)  the Partnership fails to make payment within 60 days after the date
    set for demanding payment; or
 
        (c) the Merger is not effected and the Partnership does not release  the
    transfer  restrictions imposed  on Units within  60 days after  the date set
    forth demanding payment.
 
    A dissenter will be deemed to have waived the right to demand payment unless
the dissenter notifies the Partnership of his or her demand in writing within 30
days after the Partnership makes payment for the dissenter's Units.
 
    If a demand for payment remains  unsettled, the Partnership will commence  a
proceeding  in the  Superior Court  of King  County, Washington,  within 60 days
after receiving the payment demand and petition the court to determine the  fair
value  of the Units and  accrued interest. If the  Partnership does not commence
such proceeding within  the 60-day  period, it  shall pay  each dissenter  whose
demand  remains unsettled  the amount  demanded. The  Partnership will  make all
dissenters (whether  or  not  residents  of  Washington)  whose  demands  remain
unsettled parties to the proceeding as in an action against their Units, and all
parties  must be served with a copy of the petition. The Partnership may join as
a party to the proceeding  any Unitholder who claims to  be a dissenter but  who
has  not,  in the  Partnership's opinion,  complied with  the provisions  of the
Dissenters' Rights Statute. If the court determines that such Unitholder has not
complied with the provisions of  the Dissenters' Rights Statute, the  Unitholder
shall  be dismissed as  a party. Each  dissenter made a  party to the proceeding
will be entitled to judgment  for the amount, if any,  by which the court  finds
the  fair value of the dissenter's Units, plus interest, exceeds the amount paid
by the Partnership.
 
                         ESTIMATED TAXABLE GAIN OR LOSS
 
    In order  to  assist  Unitholders  in  estimating  the  federal  income  tax
consequences  of  the  Mergers, the  following  table, prepared  by  the General
Partners, sets  forth  the  estimated gain  or  loss  that may  be  realized  by
Unitholders  receiving Shares  in the Mergers  in exchange for  each Unit. These
estimates assume that the fair  market value of the Shares  is equal to the  Net
Asset Values of the assets acquired in the Mergers. The actual amount and timing
of  gain or  loss recognized by  each Unitholder  will depend upon  a variety of
factors including the actual value of the Shares at the Closing Date for federal
income tax purposes (which may be different than the estimates set forth  below)
and  the adjusted tax basis of the  Partnership's assets as of the Closing Date.
These estimates assume  that the  Unitholder acquired his  or her  Units in  the
original  offering and not through the  secondary market. Purchasers of Units on
the secondary market may recognize additional gain to the extent the fair market
value of the Shares and amount  of cash received as additional consideration  or
in lieu of fractional shares exceeds such Unitholder's adjusted tax basis in his
or  her Units (adjusted  to reflect its  allocable share of  Partnership gain or
loss  recognized   on   the  Mergers).   See   "Material  Federal   Income   Tax
Considerations."
 
<TABLE>
<CAPTION>
                                                            MERGER
                                                         CONSIDERATION    TAX BASIS    ESTIMATED TAXABLE GAIN
PARTNERSHIP                                              PER UNIT (1)    PER UNIT(2)        PER UNIT (3)
- ------------------------------------------------------  ---------------  -----------  -------------------------
<S>                                                     <C>              <C>          <C>
IDS1..................................................     $     257      $     214           $      43
IDS2..................................................           222            220                   2
IDS3..................................................           308            236                  72
</TABLE>
 
                                      132
<PAGE>
- ------------------------
(1)  "Merger Consideration Per Unit" is computed by dividing that portion of the
    Net Asset Value allocable  to the Unitholders by  the number of  outstanding
    Units  in each Partnership  and assumes that  the Share Price  is within the
    Share Price Range.
 
(2) "Tax Basis Per Unit" is computed by dividing the adjusted portion of the tax
    basis of each Partnership's assets  net of the Partnership's liabilities  as
    of  December 31, 1995 that is allocable  to the Unitholders by the number of
    outstanding Units in such  Partnership. The adjusted  tax basis will  differ
    from the above amounts depending upon the timing of the Mergers.
 
(3)  "Estimated Taxable Gain Per Unit" is  computed by subtracting the tax basis
    from the Merger Consideration Per Unit for each Partnership.
 
                   MATERIAL FEDERAL INCOME TAX CONSIDERATIONS
 
GENERAL
 
    The following discussion  summarizes the federal  income tax  considerations
that  materially affect a Unitholder's exchange of  Units for Shares in a Merger
and his  or  her  subsequent  ownership and  disposition  of  such  Shares.  The
discussion  is general in  nature and is not  tax advice. It  is, of course, not
possible to  discuss  all  aspects of  federal  income  tax law  that  may  have
relevance  with respect to the Mergers  based on the individual circumstances of
particular  Unitholders  in   light  of   their  personal   investment  or   tax
circumstances,  or to certain types of investors (including insurance companies,
financial institutions or broker-dealers,  foreign corporations or  partnerships
and,  except to the limited extent described below, tax-exempt organizations and
persons who  are not  citizens or  residents of  the United  States) subject  to
special  treatment  under the  federal  income tax  laws.  This analysis  is not
intended as a substitute for careful tax planning, and prospective investors are
urged to consult their own tax advisors, attorneys or accountants with  specific
reference  to their  own tax situation  and potential changes  in the applicable
law. No representations are made as to state, local or foreign tax  consequences
to  any Unitholder resulting  from the Mergers and  the subsequent ownership and
disposition of the Shares. ACCORDINGLY, UNITHOLDERS SHOULD CONSULT THEIR OWN TAX
ADVISORS REGARDING THE  SPECIFIC TAX  CONSEQUENCES TO  THEM OF  THE EXCHANGE  OF
UNITS  FOR  SHARES  AND  CASH,  IF  ANY,  AND  THEIR  SUBSEQUENT  OWNERSHIP  AND
DISPOSITION OF SUCH  SHARES, INCLUDING  THE APPLICATION AND  EFFECT OF  FEDERAL,
STATE, LOCAL AND OTHER TAX LAWS AND OF POTENTIAL CHANGES IN APPLICABLE TAX LAWS.
 
OPINION OF COUNSEL
 
    The  Partnerships have obtained  an opinion of Perkins  Coie, counsel to the
Partnerships ("Counsel"), concerning  the likely  outcome on the  merits of  the
material   federal  income  tax  issues.  The  summary  of  federal  income  tax
considerations to the Unitholders set forth in this Proxy Statement/  Prospectus
has  been reviewed by Counsel, and, to  the extent such summary involves matters
of law or legal conclusions, Counsel is of the opinion that such statements  are
correct.  Such  opinion and  the discussion  herein  are based  on the  Code, as
amended, applicable Treasury Regulations  adopted thereunder, reported  judicial
decisions   and  IRS   rulings,  all  as   of  the  date   hereof,  and  certain
representations of the Company and the General Partners and factual  assumptions
related  to the ownership and operation of the Company and the Partnerships, and
assume that  the  actions  described  in  this  Proxy  Statement/Prospectus  are
completed  in  a  timely  fashion.  In the  opinion  of  Counsel,  the following
discussion fairly  summarizes the  federal income  tax considerations  that  are
likely  to  be material  to the  holder of  Units who  exchanges such  Units for
Shares. There can be no assurance, however, that the legal authorities on  which
such   opinion  and  this   discussion  are  based   will  not  change,  perhaps
retroactively,  that  the  Company's  representations  and  factual  assumptions
underlying  this discussion will be accurate or  that there will not be a change
in the  future  in the  circumstances  of the  Company  that would  affect  this
discussion.  Accordingly,  there  can be  no  assurance  that the  IRS  will not
challenge the conclusion  or propriety  of any of  Counsel's opinions.  Although
reasonable arguments
 
                                      133
<PAGE>
can  be made  for the  positions that  the Company  proposes to  take as  to tax
matters as described in this Proxy Statement/Prospectus, the federal income  tax
consequences  of a proposed  investment in the Company  cannot be predicted with
certainty, and there can be no assurance as to how the law will develop, or,  if
various issues are litigated, the outcome of the court decisions.
 
    Specifically,  Counsel  has  reached the  following  opinions  regarding the
material federal income tax issues under the law as currently in effect: (a) the
Company has been organized in conformity with the requirements for qualification
as a REIT under the Code and its method of operation as described in this  Proxy
Statement/Prospectus  and as represented by the  Company has permitted, and will
continue to permit,  it to continue  to so  qualify for its  prior, current  and
future taxable years; (b) based on the General Partners' representation that the
assets  of the Partnerships are held by  the Partnerships for investment and not
for sale to customers in the ordinary course of a trade or business, the Mergers
will not  result in  recognition  of a  material  amount of  unrelated  business
taxable income by any tax-exempt Unitholder that does not hold its interest in a
Partnership   either  as  a  dealer  under   Code  Section  512(b)(5)(B)  or  as
"debt-financed property" within the meaning of  Code Section 514, and is not  an
organization  described  in  Code Section  501(c)(7)  (social  clubs), 501(c)(9)
(voluntary  employee   beneficiary   associations),   501(c)(17)   (supplemental
unemployment  benefit  trusts)  or 501(c)(20)  (qualified  group  legal services
plans); (c) the Mergers will be taxable events for Unitholders in which gain  or
loss will (subject to the limits described below) be recognized to the extent of
each  Unitholder's allocable share of the difference  between (i) the sum of the
fair market value of the Shares received by a Partnership from the Company,  the
amount  of  any  cash paid  by  the  Company to  the  Partnership  as additional
consideration or in lieu of a fractional Share and the amount of any liabilities
of the Partnership assumed or pertaining  to properties acquired by the  Company
and  (ii) the Partnership's adjusted tax basis in its assets exchanged therefor;
and (d) Unitholders will recognize gain on  receipt of the Shares in the  Merger
to  the extent that the fair  market value of the Shares  and the amount of cash
received as Additional Consideration  or in lieu of  a fractional Share  exceeds
the Unitholder's adjusted tax basis in his or her Units exchanged therefor.
 
    With  respect to the opinion of Counsel relating to the qualification of the
Company as a REIT, it should be noted that whether the Company will qualify as a
REIT under the Code in  prior, current and future  taxable years will depend  on
whether  the Company met or meets  the various qualification tests imposed under
the Code (discussed below) through actual annual operating results, distribution
levels and diversity  of stock ownership.  The results of  these tests have  not
been and will not be reviewed by Counsel. Accordingly, no assurance can be given
that  the actual results of the  Company's operations for any particular taxable
year have satisfied and will satisfy such requirements. See "-- Taxation of  the
Company as a REIT--Requirements for Qualification" and "-- Failure to Qualify."
 
TAX CONSEQUENCES OF THE MERGERS
 
    TAX  CONSEQUENCES OF ACQUISITION.  In the Mergers, solely for federal income
tax purposes, each Partnership's assets will be treated as being transferred  to
the  Company in  return for Shares  of the  Company and cash  paid as additional
consideration or in lieu  of fractional Shares. Such  transfer will (subject  to
the  limits  described below)  result in  recognition  of gain  or loss  by each
Partnership and, therefore, will  result in recognition of  gain or loss by  the
Unitholders  in each Partnership (other  than certain tax-exempt Unitholders who
had not held  their Units  as a  dealer under  Code Section  512(b)(5)(B) or  as
"debt-financed  property"  within  the meaning  of  Code Section  514).  See "--
Consequences to  Tax-Exempt Unitholders."  The overall  amount of  gain or  loss
recognized  by each  Partnership will  (subject to  the limits  described below)
equal the difference between (a) the sum of the fair market value of the  Shares
received  by the Partnership in the Merger plus  any cash paid by the Company to
the Partnership as additional consideration or in lieu of a fractional Share and
the amount of liabilities of the Partnership assumed or pertaining to properties
acquired by the  Company and  (b) the Partnership's  adjusted tax  basis in  the
assets  exchanged therefor. Counsel can give  no opinion regarding the amount of
gain or loss recognized by  a Partnership because of  the factual nature of  the
determination.  To assist the Unitholders in  estimating the tax cost associated
with the Mergers, the General
 
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Partners have prepared a table estimating the amount of gain or loss that may be
recognized by a Unitholder receiving Shares in the Mergers in exchange for  each
Unit. See "Estimated Taxable Gain Or Loss."
 
    As  of December  31, 1995,  no Partnership has  made an  election under Code
Section 754. Accordingly, the amount of gain or loss recognized by a Partnership
as a  result of  the Mergers  will  be not  be determined  by reference  to  the
purchase  price paid prior to  1996 by any Unitholder for  his or her Units. The
Partnerships may make an election under Code  Section 754 in 1996 to adjust  the
tax  basis  of  their  assets  to reflect  the  amount  paid  by  any Unitholder
purchasing his or her interest in the Partnerships during 1996. Any reduction in
gain or increase in  loss resulting from  this adjustment in  tax basis will  be
allocated  entirely  to such  purchasing  Unitholders. As  described  in greater
detail below, the basis that each Unitholder  will have in Shares received as  a
result  of the Mergers  will equal the  Unitholder's basis in  his or her Units,
adjusted to reflect any gain or loss recognized on the distribution of Shares or
cash to the Unitholder and any gain or loss allocated to him or her from his  or
her Partnership as a result of the Mergers.
 
    ALLOCATION  OF GAIN OR LOSS AMONG  PARTICIPATING UNITHOLDERS.  The amount of
gain or loss recognized by the Partnerships  in the year of the Mergers will  be
allocated  among their  respective Unitholders in  accordance with  the terms of
their respective Partnership Agreements. Pursuant to these terms, in the case of
Partnerships that recognize a gain or loss on the Mergers, each Unitholder  will
be allocated and must report its allocable share of such gain or loss.
 
    CHARACTERIZATION OF GAIN OR LOSS.  In general, gains or losses realized with
respect  to transfers of the assets of  each of the Partnerships will be treated
as realized from the sale  of a Code "Section  1231" asset (i.e., real  property
and  depreciable assets used in  a trade or business and  held for more than one
year). A Unitholder's share  of gains or  losses from the  sale of Section  1231
assets  of a Partnership would be combined with any other Section 1231 gains and
losses recognized by such Unitholder in that year. If the result is a net  loss,
such  loss is characterized  as an ordinary loss.  If the result  is a net gain,
such gain is characterized as a capital gain; provided, however, that such  gain
will   be  treated  as  ordinary  income   to  the  extent  the  Unitholder  has
"non-recaptured" Section  1231  losses.  For  these  purposes,  "non-recaptured"
Section  1231 losses means a Unitholder's  aggregate Section 1231 losses for the
five most  recent prior  years  that have  not  previously been  recaptured.  In
addition,  a Unitholder's  net gain  will be treated  as ordinary  income to the
extent such gain is attributable  to previously allowed depreciation  deductions
subject to recapture under Code Section 1245 or 1250.
 
    Each  Partnership  has incurred  syndication  costs in  connection  with its
initial  offering  of  the  Units.  In  connection  with  a  liquidation  of   a
partnership,  the IRS has  suggested that syndication costs  are deductible by a
partner only to the extent that the amount of cash liquidation proceeds received
by the partner are less  than the adjusted tax basis  of his or her  partnership
interest.  It  is  not  clear, therefore,  whether  Unitholders  will  realize a
deduction in connection with these syndication  expenditures as a result of  the
Merger.  Counsel  is of  the belief,  however,  that because  a Unitholder  of a
Partnership participating in a Merger is treated as having liquidated his or her
interest  in  the  Partnership,  the  Unitholder's  allocable  share  of   these
syndication  costs should  be deductible as  a capital  loss in the  year of the
Merger. This  capital  loss  is  generally  deductible  to  the  extent  of  the
Unitholder's  other  capital  gains  recognized during  the  year  including the
Unitholder's share of Section 1231 gain recognized in the Merger. The  estimates
provided in "Estimated Taxable Gain or Loss" reflect the taxable gain net of the
capital loss realized from the syndication expense.
 
    Any  gain recognized as a result of the  distribution of Shares or cash to a
Unitholder as described  below will  be treated as  capital gain  except to  the
extent  a portion of the gain is attributable to previously allowed depreciation
deductions subject to recapture under Code Section 1245 or 1250.
 
    For purposes of  the passive activity  rules of Code  Section 469, gains  or
losses recognized from transfers of the Partnerships' assets generally should be
treated  as passive activity income or loss. The Code provides that, in general,
a taxpayer who  disposes of his  or her  entire interest in  a passive  activity
during  a taxable year  is entitled to  treat the excess  of passive losses from
such activity
 
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(including such activity's suspended passive losses from prior periods plus  any
loss  recognized on  the disposition) over  that year's passive  income or gains
from all the taxpayer's activities as not being subject to passive activity loss
limitations. For this provision to apply, however, the taxpayer must dispose  of
his  or her entire  interest in the  passive activity to  an unrelated taxpayer.
Because a  Unitholder  who receives  Shares  in  the Company  has  a  continuing
indirect  interest in  the Partnership's activity  following the  Mergers, it is
uncertain whether the  Mergers will result  in a disposition  of a  Unitholder's
entire interest in the passive activity of a Partnership. Dissenting Unitholders
receiving  solely cash, however,  should be treated as  having disposed of their
entire interest in the Partnership and therefore should be able to utilize  this
provision of the Code.
 
    MERGERS  OF  THE  PARTNERSHIPS.   Upon  consummation  of  the  Mergers, each
Partnership will  cease to  exist and  will be  treated for  federal income  tax
purposes  as  distributing  to  its  Unitholders the  Shares  it  is  treated as
receiving in the Merger. The taxable year  of each Partnership will end at  such
time.  Assuming  the Closing  Date  is no  later  than December  31,  1996, each
Unitholder must report, in his or her taxable year that includes the Merger, his
or her  share  of  all  income,  gain,  loss,  deduction  and  credit  for  such
Partnership  for  the period  January 1,  1996  through the  date of  the Merger
(including his or her  allocable share of  the gain or  loss resulting from  the
Merger  described above). Accordingly, an  individual Unitholder would report on
his or her return for 1996 his or her share of all income, gain, loss, deduction
and credit for such Partnership, including any  gain or loss from the Merger.  A
Unitholder  whose taxable year differs from that of the Partnership's could have
a "bunching" of income from the Partnership and the Company because of the short
taxable year of the Partnership. However, a Unitholder whose taxable year is the
calendar year will not experience any "bunching" of income.
 
    DISTRIBUTION OF SHARES.  The distribution by a Partnership of Shares or cash
to a Unitholder will be  taxable to the Unitholder to  the extent that the  fair
market value of the Shares distributed to such Unitholder and the amount of cash
paid  as additional consideration or  in lieu of a  fractional Share exceeds the
adjusted tax basis of such Unitholder's interest in the Partnership  immediately
before  the distribution as adjusted by such Unitholder's allocable share of the
taxable gain or loss  recognized by the Partnership  in the Merger. Because  the
Shares  will be publicly  traded after the  Mergers, they are  treated for these
purposes in the same manner as cash to the extent of their fair market value  as
of  the date of  distribution. Notwithstanding the above,  a Unitholder will not
recognize a taxable loss  on the distribution  of the Shares  to the extent  the
fair  market  value of  the Shares  and the  amount of  cash paid  as Additional
Consideration or in lieu  of a fractional  Share is less  than the adjusted  tax
basis  of a Unitholder's interest  in the Partnership. Any  gain recognized as a
result of the distribution of Shares or cash to a Unitholder will be treated  as
capital  gain except  to the  extent a  portion of  the gain  is attributable to
previously allowed  depreciation  deductions  subject to  recapture  under  Code
Section 1245 or 1250.
 
    A  Unitholder who  receives Shares in  the Merger  will have a  basis in the
Shares equal  to the  sum of  (a) the  Unitholder's basis  in his  or her  Units
adjusted  by  such  Unitholder's  distributive  share  of  income,  gain,  loss,
deduction and credit for the  final taxable year of  the Partnership as well  as
distributions (including any cash paid as additional consideration or in lieu of
a  fractional  Share)  received  in  such final  taxable  year  (other  than the
distribution of Shares to the  Unitholder) and (b) the  amount of gain, if  any,
recognized  by  the Unitholder  on the  distribution and  receipt of  the Shares
pursuant to the  foregoing. A Unitholder's  holding period for  the Shares  will
begin on the date of the Merger.
 
    TAX CONSEQUENCES TO DISSENTING UNITHOLDERS.  A Unitholder subject to federal
income  tax who  exercises dissenters' rights  will recognize  taxable income or
loss equal to the difference between (a) the sum of the amount of cash  received
plus  the  amount  of the  Unitholder's  liabilities as  determined  pursuant to
Section 752 of the Code and (b) the  adjusted tax basis in his or her Units,  as
adjusted  immediately prior  to the  Merger. Any  gain or  loss recognized  by a
dissenting Unitholder will  be treated  as capital gain  or loss  except to  the
extent a portion of such gain is attributable to previously allowed depreciation
deductions subject to recapture under Code Section 1245 or 1250.
 
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<PAGE>
    CONSEQUENCES  TO  TAX-EXEMPT UNITHOLDERS.   Based  on the  General Partners'
representation that the Partnerships'  assets are held  by the Partnerships  for
trade  or business purposes and not for sale to customers in the ordinary course
of a trade  or business, Counsel  is of the  opinion that the  Mergers will  not
result  in recognition of a  material amount of UBTI  by a tax-exempt Unitholder
that does not hold an interest in the Partnerships either as a dealer under Code
Section 512(b)(5)(B) or as "debt-financed  property" within the meaning of  Code
Section  514, and  is not  an organization  described in  Code Section 501(c)(7)
(social  clubs),  501(c)(9)   (voluntary  employee  beneficiary   associations),
501(c)(17)  (supplemental unemployment benefit  trusts) or 501(c)(20) (qualified
group legal services plans) regardless  of whether such Unitholder  participates
or exercises dissenters' rights in connection with the Mergers. The four classes
of  exempt organizations noted in the previous sentence may recognize a material
amount of gain or loss in the Mergers.
 
    TAX CONSEQUENCES TO  THE COMPANY.   The Company will  not recognize gain  or
loss as a result of the Mergers. The basis of the assets received by the Company
from  the Partnerships will equal the fair  market value of the Shares issued by
the Company in the Mergers, plus any cash paid by the Company in the Mergers  as
additional  consideration or in lieu  of fractional Shares or,  on behalf of the
Partnerships, to Unitholders  exercising dissenters'  rights and  the amount  of
Partnership  liabilities assumed  by the Company  in the  Mergers. The Company's
basis in  the  properties  may  differ from  the  Partnerships'  basis  in  such
properties  and the properties will be subject  to longer depreciable lives as a
result of the  Mergers. These  factors could result  in an  overall increase  or
decrease  in  the  depreciation deductions  attributable  to the  assets  of the
Partnerships following the Mergers.
 
TAXATION OF THE COMPANY AS A REIT
 
    GENERAL.  Unitholders participating  in the Mergers will  own shares in  the
Company.  The Company  has made  an election to  be taxed  as a  REIT under Code
Sections 856 through 860,  commencing with its taxable  year ended December  31,
1994.  The  Company  believes  that, commencing  with  its  taxable  year ending
December 31, 1994, it has been organized and has operated in such a manner as to
qualify for taxation as a REIT under  the Code. The Company intends to  continue
to  operate in such a manner, but no assurance can be given that it will operate
in a manner so as to qualify or remain qualified.
 
    These  sections  of  the  Code   are  highly  technical  and  complex.   The
determination  of  various factual  matters and  circumstances are  not entirely
within the control of  the Company and  may affect its ability  to qualify as  a
REIT.  The following summary  sets forth the  material aspects of  the Code that
govern the federal  income tax treatment  of a REIT  and its stockholders.  This
summary  is qualified in  its entirety by the  applicable Code provisions, rules
and  regulations  promulgated  thereunder,   and  administrative  and   judicial
interpretations thereof.
 
    If  the Company qualifies for  taxation as a REIT,  it generally will not be
subject to federal corporate  income taxes on its  net income that is  currently
distributed to stockholders. This treatment substantially eliminates the "double
taxation"  (at the  corporate and stockholder  levels) of  income that generally
results from investment in a regular corporation. The Company, however, will  be
subject to federal income and excise taxes as follows:
 
        (a)  The  Company  will  be  taxed at  regular  corporate  rates  on any
    undistributed REIT  taxable  income,  including  undistributed  net  capital
    gains.
 
        (b)  Under  certain circumstances,  the Company  may  be subject  to the
    "alternative minimum tax" on its items of tax preference.
 
        (c) If the Company has (i) net income from the sale or other disposition
    of "foreclosure property" that  is held primarily for  sale to customers  in
    the  ordinary course  of business  or (ii)  other nonqualifying  income from
    foreclosure property, it  will be subject  to tax at  the highest  corporate
    rate on such income.
 
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<PAGE>
        (d)  If the Company  has net income  from prohibited transactions (which
    are, in  general,  certain sales  or  other dispositions  of  property  held
    primarily  for sale  to customers in  the ordinary course  of business other
    than foreclosure property), such income will be subject to a 100% tax.
 
        (e) If the Company should fail to  satisfy the 75% gross income test  or
    the  95%  gross  income  test  (as  discussed  below),  but  has nonetheless
    maintained its qualification  as a REIT  because certain other  requirements
    have  been met, it will be  subject to a 100% tax  on an amount equal to (i)
    the gross income  attributable to  the greater of  the amount  by which  the
    Company  fails  the 75%  or  gross income  95%  test, multiplied  by  (ii) a
    fraction intended to reflect the Company's profitability.
 
        (f) If the Company should fail  to distribute during each calendar  year
    at  least the sum of (i) 85% of its REIT ordinary income for such year, (ii)
    95% of  its REIT  capital  gain net  income for  such  year, and  (iii)  any
    undistributed  taxable  income  from  prior periods,  the  Company  would be
    subject to a 4% excise tax on the excess of such required distribution  over
    the amounts actually distributed.
 
        (g)  With respect to any asset (a "Built-in Gain Asset") acquired by the
    Company from  a corporation  that is  or  has been  a C  corporation  (i.e.,
    generally,  a corporation  subject to  full corporate-level  tax) in certain
    transactions in which the basis of the  Built-in Gain Asset in the hands  of
    the Company is determined by reference to the basis period (the "Recognition
    Period")  beginning on  the date  on which  such asset  was acquired  by the
    Company, then, to the extent of the "Built-in Gain" (i.e., the excess of (i)
    the fair market value of such  asset over (ii) the Company's adjusted  basis
    in  such asset, determined  as of the beginning  of the Recognition Period),
    such gain  will be  subject to  tax at  the highest  regular corporate  rate
    pursuant  to Treasury  Regulations that have  not yet  been promulgated. The
    results described above  with respect  to the recognition  of built-in  gain
    assume  that the Company will  make or has made  an election pursuant to IRS
    Notice 88-19.
 
    On March 19,  1996, President Clinton  submitted to Congress  a budget  bill
that  includes a  proposal to  require large  C corporations  (defined as  any C
corporation having aggregate  stock value  greater than  $5,000,000) that  after
December  31, 1996  either convert  to REIT status  or are  acquired by existing
REITs in otherwise qualified reorganizations under Code Section 368 to recognize
any Built-in Gain at the time of  the conversion or acquisition. As of the  date
of  this Proxy  Statement/ Prospectus,  no further  legislative action  has been
taken with respect to this proposal.
 
    REQUIREMENTS FOR QUALIFICATION.  The Code  defines a REIT as a  corporation,
trust  or association (i) that is managed  by one or more trustees or directors,
(ii) the beneficial ownership of which  is evidenced by transferable shares,  or
by transferable certificates of beneficial interest, (iii) that would be taxable
as  a domestic corporation, but for Code  Sections 856 through 859, (iv) that is
neither a  financial institution  nor an  insurance company  subject to  certain
provisions  of the Code, (v) the beneficial ownership of which is held by 100 or
more persons, (vi) during the last half  of each taxable year not more than  50%
in value of the outstanding stock of which is owned, directly or constructively,
by  five  or  fewer individuals  (as  defined  in the  Code  to  include certain
entities), and (vii) that meets certain other tests, described below,  regarding
the  nature of its income  and assets. The Code  provides that conditions (i) to
(iv), inclusive, must be met during  the entire taxable year and that  condition
(v)  must be met  during at least  335 days of  a taxable year  of 12 months, or
during a proportionate part of a taxable year of less than 12 months. Conditions
(v) and (vi)  will not apply  until after the  first taxable year  for which  an
election is made to be taxed as a REIT.
 
    The  Company has issued sufficient shares  to allow it to satisfy conditions
(v) and (vi). In addition,  the Company's Certificate of Incorporation  provides
for  restrictions  regarding  the transfer  and  ownership of  its  stock, which
restrictions are intended  to assist the  Company in continuing  to satisfy  the
stock  ownership requirements described  in conditions (v)  and (vi) above. Such
transfer and ownership  restrictions are  described in  "Description of  Capital
Stock -- Restrictions on Transfers of Capital
 
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Stock; Excess Stock." There can be no assurance, however, that such transfer and
ownership  restrictions will,  in all  cases, prevent  a violation  of the stock
ownership provisions described in conditions (v) and (vi) above.
 
    INCOME TESTS.   In order to  maintain qualification as  a REIT, the  Company
must  satisfy annually three  gross income requirements. First,  at least 75% of
the Company's gross income (excluding gross income from prohibited transactions)
for each taxable year  must be derived directly  or indirectly from  investments
relating  to real property or mortgages  on real property (including "rents from
real property" and, in certain circumstances, interest) or from certain types of
temporary investments.  Second,  at least  95%  of the  Company's  gross  income
(excluding gross income from prohibited transactions) for each taxable year must
be  derived from  such real property  investments, dividends,  interest and gain
from the sale or disposition of stock or securities (or from any combination  of
the  foregoing). Third,  short-term gain from  the sale or  other disposition of
stock or securities, gain from prohibited  transactions and gain on the sale  or
other  disposition of real  property held for  less than four  years (apart from
involuntary conversions and sales of  foreclosure property) must represent  less
than  30% of the Company's gross  income (including gross income from prohibited
transactions) for each taxable year.
 
    Rents  received  by  the  Company  on  the  lease  of  self-service  storage
facilities  will qualify as  "rents from real property"  in satisfying the gross
income requirements for a  REIT described above only  if several conditions  are
met.  First, the amount  of rent must  not be based  in whole or  in part on the
income or  profits  of  any  person. However,  an  amount  received  or  accrued
generally  will not be excluded from the  term "rents from real property" solely
by reason of being  based on a  fixed percentage or  percentages of receipts  or
sales.  Second, the  Code provides  that rents received  from a  tenant will not
qualify as "rents from  real property" in satisfying  the gross income tests  if
the  REIT, or an  owner of 10% or  more of the  REIT, actually or constructively
owns 10% or  more of  such tenant  (a "Related  Party Tenant").  Third, if  rent
attributable  to personal  property, leased in  connection with a  lease of real
property, is greater than 15% of the  total rent received under the lease,  then
the  portion of rent attributable to such  personal property will not qualify as
"rents from real property."  The Company does not  anticipate charging rent  for
any  portion of any property that is based in  whole or in part on the income or
profits of any person,  and the Company does  not anticipate receiving rents  in
excess  of  a de  minimis amount  from Related  Party Tenants.  Furthermore, the
Company does  not lease  personal  property in  connection  with its  rental  of
self-service storage facilities.
 
    Finally,  for rents received  to qualify as "rents  from real property," the
Company generally must not operate or  manage the property or furnish or  render
services  to the  tenants of  such property,  other than  through an independent
contractor from whom the  REIT derives no revenue;  provided, however, that  the
REIT  may directly  perform certain  services that  are "usually  or customarily
rendered" in connection with the rental of space for occupancy only and are  not
otherwise  considered "rendered  to the occupant"  of the  property. The Company
performs or "self-administers" the property management activities for properties
it owns. The Company has obtained a private letter ruling from the IRS providing
that the property management services rendered by the Company will not adversely
affect the  characterization of  the  Company's rents  from real  property.  The
ruling  is based on a description of  those management services performed by the
Company in connection  with its own  properties, including maintenance,  repair,
lease  administration and  accounting, and  security. The  ruling also considers
certain ancillary services  to be  directly performed  by the  Company, such  as
truck rentals and inventory sales. The ruling provides that such services do not
otherwise adversely affect the characterization of the rental income received by
the  Company. Nonetheless, income from truck rentals and certain other ancillary
services do not qualify under these gross income tests ("Nonqualifying Income").
The Company has represented that the services to be rendered by the Company with
respect to the Partnerships' properties  acquired in the Mergers are  consistent
with  those management services  described in the ruling.  In addition, the fees
and consideration  received by  the Company  for performance  of management  and
administrative  services with  respect to properties  that are not  owned by the
Company will  also be  treated as  Nonqualifying Income.  Such income  will  not
qualify
 
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under  either the  75% or  95% gross  income test  and may  adversely affect the
Company's continued  qualification as  a  REIT. The  Company believes  that  the
aggregate  amount of the service income  (and any other Nonqualifying Income) in
any taxable year will  not exceed the limits  on Nonqualifying Income under  the
gross income tests described above.
 
    The  term  "interest"  generally does  not  include any  amount  received or
accrued (directly or indirectly) if the determination of such amount depends  in
whole  or in  part on the  income or profits  of any person.  However, an amount
received or accrued  generally will  not be  excluded from  the term  "interest"
solely by reason of being based on a fixed percentage or percentages of receipts
or sales.
 
    If  the Company fails to satisfy one or both of the 75% and 95% gross income
tests for any taxable year, it may nevertheless qualify as a REIT for such  year
if  it is entitled to relief under  certain provisions of the Code. These relief
provisions will be  generally available if  the Company's failure  to meet  such
tests  was due to reasonable  cause and not due  to willful neglect, the Company
attaches a schedule of the sources of its income to its return and any incorrect
information on the schedule was not due  to fraud with the intent to evade  tax.
It  is not possible, however, to state  whether in all circumstances the Company
would be entitled to the benefit of these relief provisions. As discussed  above
in  "-- General," even if these relief  provisions apply, a tax would be imposed
with respect to the excess net income.
 
    ASSET TESTS.  The Company, at the close of each quarter of its taxable year,
must also satisfy three tests  relating to the nature  of its assets. First,  at
least 75% of the value of the Company's total assets must be represented by real
estate  assets (including (i) its allocable share of the real estate assets held
by partnerships in which  the Company owns  an interest and  (ii) stock or  debt
instruments  held for not  more than one  year purchased with  the proceeds of a
stock offering or long-term  (at least five years)  public debt offering of  the
Company),  cash, cash items and government securities. Second, not more than 25%
of the Company's total assets may be represented by securities other than  those
in  the 75%  asset class. Third,  of the  investments included in  the 25% asset
class, the value of  any one issuer's  securities owned by  the Company may  not
exceed 5% of the value of the Company's total assets and the Company may not own
more than 10% of any one issuer's outstanding voting securities.
 
    The  Company owns interests in several  subsidiary partnerships. In the case
of a REIT that is a partner in a partnership, Treasury Regulations provide  that
the  REIT will  be deemed to  own its proportionate  share of the  assets of the
partnership and will be deemed to be  entitled to the income of the  partnership
attributable  to such share. In addition, the  character of the assets and gross
income of the partnership shall  retain the same character  in the hands of  the
REIT  for purposes  of Code Section  856, including satisfying  the gross income
tests and the asset tests.
 
    The treatment  for partnerships  is conditioned  on the  treatment of  these
entities  as  partnerships  for  federal  income  tax  purposes  (as  opposed to
associations or  publicly traded  partnerships taxable  as corporations).  If  a
partnership  is treated as an association, it would be taxable as a corporation.
Furthermore, if  a  partnership  is publicly  traded,  it  will be  taxed  as  a
corporation  unless at  least 90%  of its gross  income is  derived from certain
qualifying sources  including real  property  rents. In  such situations,  if  a
REIT's  ownership in any partnership taxed as  a corporation exceeded 10% of the
partnership's voting interest or the value  of such interest exceeded 5% of  the
value  of  the  REIT's  assets, the  REIT  would  cease to  qualify  as  a REIT.
Furthermore, in such situations, distributions  from any of the Partnerships  to
the  Company would be treated as dividends,  which are not taken into account in
satisfying the 75% gross income test described above and which could, therefore,
make it more difficult  for the REIT  to qualify for the  taxable year in  which
such  distributions are received. In addition,  in such situations, the interest
in any of the Partnerships  held by the REIT would  not qualify as "real  estate
assets,"  which could make it more difficult for  the REIT to meet the 75% asset
test described above. Finally, in such situations, the REIT would not be able to
deduct its share of  any losses generated by  the Partnerships in computing  its
taxable income. The Company believes that
 
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each  of the partnerships in  which it owns an interest  will be treated for tax
purposes as a partnership (and not as an association taxable as a  corporation).
Nonetheless,  there  can  be no  assurance  that  the IRS  may  not successfully
challenge the tax status of any of these partnerships.
 
    ANNUAL DISTRIBUTION REQUIREMENTS.   The Company,  in order to  qualify as  a
REIT, is required to distribute dividends (other than capital gain dividends) to
the  stockholders in an amount at  least equal to (a) the  sum of (i) 95% of the
Company's REIT taxable  income (computed  without regard to  the dividends  paid
deduction  and  the  Company's net  capital  gain  (as defined  in  Code Section
857(b)(2), the "REIT  Taxable Income")) and  (ii) 95% of  the net income  (after
tax),  if any, from foreclosure property, minus  (b) the sum of certain items of
noncash income. In addition, if the Company disposes of any Built-in Gain  Asset
during  its  Recognition  Period,  the Company  will  be  required,  pursuant to
Treasury Regulations that have not yet been promulgated, to distribute at  least
95%  of the Built-in Gain (after tax),  if any, recognized on the disposition of
such asset. Such distributions must  be paid in the  taxable year to which  they
relate,  or in the following taxable year  if declared before the Company timely
files its tax return for  such year and if paid  on or before the first  regular
dividend payment after such declaration. To the extent that the Company does not
distribute  all of its  net capital gain  or distributes at  least 95%, but less
than 100%, of its REIT  Taxable Income, as adjusted, it  will be subject to  tax
thereon  at regular ordinary  and capital gain corporate  tax rates. The Company
intends  to  make  timely  distributions  sufficient  to  satisfy  these  annual
distribution requirements.
 
    It  is possible that the Company, from time to time, may not have sufficient
cash or  other liquid  assets to  meet the  distribution requirements  described
above  due to timing  differences between (i)  the actual receipt  of income and
actual payment of deductible expenses and (ii) the inclusion of such income  and
deduction  of such expenses in arriving at taxable income of the Company. In the
event that such  timing differences  occur, in  order to  meet the  distribution
requirements,  the Company may  find it necessary to  arrange for short-term, or
possibly long-term, borrowings or to pay dividends in the form of taxable  stock
dividends.
 
    If,  as a result of an adjustment by the IRS, the Company would fail to meet
the above distribution requirements  for a particular year,  the Company may  be
able   to  rectify  such  failure  by   paying  "deficiency  dividends"  to  the
stockholders in a later year, which  may be included in the Company's  deduction
for  dividends paid for the earlier year. Thus, the Company may be able to avoid
being taxed on amounts distributed as deficiency dividends; however, the Company
will be required to pay interest based on the amount of any deduction taken  for
deficiency dividends.
 
    Furthermore,  if the Company should fail  to distribute during each calendar
year at least the sum of (i) 85% of its REIT ordinary income for such year, (ii)
95% of its REIT capital gain income  for such year, and (iii) any  undistributed
taxable  income from prior periods,  the Company will be  subject to a 4% excise
tax on  the excess  of  such required  distribution  over the  amounts  actually
distributed.
 
    FAILURE  TO QUALIFY.  If the Company fails to qualify for taxation as a REIT
in any taxable year, and the relief provisions do not apply, the Company will be
subject to tax (including any applicable alternative minimum tax) on its taxable
income at regular corporate rates. Distributions to the stockholders in any year
in which the Company fails to qualify will not be deductible by the Company  nor
will distributions be required to be made. As a result, the Company's failure to
qualify as a REIT will reduce the cash available for distribution by the Company
to the stockholders. In addition, if the Company fails to qualify as a REIT, all
distributions  to the  stockholders will  be taxable  as ordinary  income to the
extent of current and accumulated earnings and profits, and, subject to  certain
limitations  of  the  Code,  corporate  distributees  may  be  eligible  for the
dividends received deduction. Unless entitled to relief under specific statutory
provisions, the Company will  also be disqualified from  taxation as a REIT  for
the  four taxable years following the  year during which qualification was lost.
It is not possible to  state whether in all  circumstances the Company would  be
entitled to such statutory relief.
 
    TAXATION  OF TAXABLE STOCKHOLDERS.   As long  as the Company  qualifies as a
REIT, distributions made to the Company's taxable stockholders out of current or
accumulated earnings and profits (and
 
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not designated as capital gain dividends) will be taken into account by them  as
ordinary  income and will  not be eligible for  the dividends received deduction
for corporations. Distributions  that are designated  as capital gain  dividends
will  be taxed as long-term  capital gain (to the extent  they do not exceed the
Company's actual net capital  gain for the taxable  year) without regard to  the
period  for  which  the  stockholder has  held  its  shares.  However, corporate
stockholders may  be  required  to treat  up  to  20% of  certain  capital  gain
dividends as ordinary income. Distributions in excess of current and accumulated
earnings  and profits will  not be taxable  to a stockholder  to the extent that
they do not exceed  the adjusted basis of  the stockholder's shares, but  rather
will  reduce  the  adjusted  basis  of such  shares.  To  the  extent  that such
distributions exceed the adjusted basis of  a stockholder's shares they will  be
included  in income as long-term capital gain (or short-term capital gain if the
shares have been held for  one year or less) assuming  the shares are a  capital
asset in the hands of the stockholder. In addition, any dividend declared by the
Company in October, November or December of any year payable to a stockholder of
record  on a specified date in  any such month shall be  treated as both paid by
the Company  and  received by  the  stockholder on  December  31 of  such  year;
provided,  however, that  the dividend  is actually  paid by  the Company during
January of the following  calendar year. Stockholders may  not include in  their
individual  income tax returns any net operating losses or capital losses of the
Company.
 
    Distributions paid to stockholders  will constitute portfolio income  (i.e.,
income  from dividends that is not derived in  the ordinary course of a trade or
business) for purposes  of Code  Section 469  and not  passive activity  income.
Accordingly, such income will not be subject to reduction by losses from passive
activities  (e.g., any interest in a trade  or business held by a stockholder in
which the stockholder does not  materially participate) of stockholders who  are
subject  to the  passive activity  loss rules.  However, income  attributable to
distributions may be  offset by  investment expense deductions,  subject to  the
limitation  that  individual investors  may  only deduct  miscellaneous itemized
deductions (including investment expense) to  the extent such deductions  exceed
2% of the investor's adjusted gross income.
 
    Gain  or loss recognized by a stockholder  who is not a dealer in securities
on the sale of shares that have been held for more than one year will  generally
be  taxable as  long-term capital  gain or  loss. Furthermore,  if a stockholder
sells shares  that were  held for  six months  or less  (after applying  certain
holding  period rules) and with respect to which a capital gain distribution was
received, any loss on the sale up to the amount of the capital gain distribution
will be treated as long-term capital loss.
 
    TAXATION OF  TAX-EXEMPT  STOCKHOLDERS.    The IRS  has  ruled  that  amounts
distributed  as  dividends  by a  qualified  REIT  do not  constitute  UBTI when
received by  a  tax-exempt  entity.  Based  on  that  ruling,  provided  that  a
tax-exempt  stockholder (except certain tax-exempt stockholders described below)
has not held  its shares of  Common Stock or  Units it exchanged  for Shares  as
"debt-financed property" within the meaning of the Code and the shares of Common
Stock  are not otherwise  used in an  unrelated trade or  business, the dividend
income from the Company will not be UBTI to a tax-exempt stockholder. Similarly,
income from the sale of shares of  Common Stock will not constitute UBTI  unless
such  tax-exempt stockholder  has held  such shares  as "debt-financed property"
within the  meaning of  Code  Section 514  or is  a  dealer under  Code  Section
512(b)(5)(B).
 
    For  tax-exempt  stockholders  that  are  social  clubs,  voluntary employee
benefit associations,  supplemental unemployment  benefit trusts  and  qualified
group  legal  services  plans exempt  from  federal income  taxation  under Code
Section 501(c)(7), (c)(9),  (c)(17) and  (c)(20), respectively,  income from  an
investment  in the Company will constitute  UBTI unless the organization is able
to properly deduct amounts set aside  or placed in reserve for certain  purposes
so  as to  offset the income  generated by  its investment in  the Company. Such
prospective investors should  consult their  own tax  advisors concerning  these
"set aside" and reserve requirements.
 
    Notwithstanding  the above,  however, a portion  of the dividends  paid by a
"pension held  REIT" shall  be treated  as  UBTI as  to any  trust that  (i)  is
described in Code Section 401(a), (ii) is tax-exempt
 
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<PAGE>
under  Code  Section 501(a)  and (iii)  holds more  than 10%  (by value)  of the
interests in  the REIT.  Tax-exempt pension  funds that  are described  in  Code
Section 401(a) are referred to below as "qualified trusts."
 
    A REIT is a "pension held REIT" if (i) it would not have qualified as a REIT
but  for  the fact  that Code  Section  856(h)(3) provides  that stock  owned by
qualified trusts shall be  treated, for the purposes  of the "not closely  held"
requirement,  as owned  by the  beneficiaries of the  trust (rather  than by the
trust itself), and (ii) either (a) at least one such qualified trust holds  more
than  25%  (by value)  of the  interests in  the REIT  or (b)  one or  more such
qualified trusts, each of which owns more  than 10% (by value) of the  interests
in  the REIT, hold in the aggregate more than 50% (by value) of the interests in
the REIT. The Company believes that it has not been, and will not be immediately
following the Closing  Date, a  "pension held REIT"  within the  meaning of  the
Code.
 
    TAXATION OF FOREIGN STOCKHOLDERS.  The rules governing U.S. income, gift and
estate taxation of foreign entities and individuals who are neither citizens nor
residents of the United States are complex. They depend not only on U.S. federal
and  state income, gift and estate tax  principles, but also on the treaties, if
any, between the  United States  and the  country of  the nonresident  investor.
Accordingly,  no  attempt will  be made  in  this Proxy  Statement/Prospectus to
provide more than a brief summary of certain rules relating to the Mergers.  All
foreign Unitholders should consult their own tax advisors as to the treatment of
the  Mergers and the ownership of Shares  and the operation of the Company under
the tax laws applicable to them.
 
    The  Foreign  Investment  in  Real  Property  Tax  Act  of  1980  ("FIRPTA")
introduced  special rules applicable to foreign investors in U.S. real property.
FIRPTA generally subjects  foreign investors  to U.S. taxation  at regular  U.S.
rates  on the gain from the sale by such foreign investors of U.S. real property
interests ("USRPIs"), which include (i) U.S.  real estate and (ii) interests  in
certain  entities (including partnerships) holding U.S. real estate. FIRPTA also
imposes withholding on such sales.
 
    Code Section  702(b) determines  the  character of  an  item included  in  a
partner's  distributive share of gain  realized by a partnership  as if the item
were realized directly from the source from  which the item was realized by  the
partnership.  Therefore, if a partnership sells  a USRPI, FIRPTA should apply as
if the foreign partner had  sold the USRPI directly.  The Company, based on  the
advice   of  Counsel,  believes  that  substantially   all  the  assets  in  the
Partnerships consist of USRPIs. Accordingly, each foreign Unitholder should take
into account  its  distributive  share of  any  gain  or loss  recognized  by  a
Partnership  on its disposition of the USRPIs in the Mergers, and, consequently,
the foreign Unitholder should be subject  to tax upon its distributive share  of
any such gain.
 
    Under  FIRPTA, a domestic partnership  must withhold tax at  the rate of 35%
with respect  to the  partnership's gain  recognized on  the disposition  of  an
USRPI,  to  the extent  such  gain is  allocable  to a  foreign  partner. FIRPTA
withholding, however, is superseded to the extent the withholding rules of  Code
Section  1446 apply. Code  Section 1446 requires partnerships  to withhold, at a
39.6% rate  with respect  to noncorporate  foreign partners  and 35%  rate  with
respect to corporate foreign partners, on "effectively connected taxable income"
allocable to foreign partners. Withholding arises under Code Section 1446 from a
foreign partner's distributive share of the income from a disposition of a USRPI
since  FIRPTA characterizes  gain as  effectively connected  income. Any amounts
withheld in respect of a foreign partner are treated as a credit against the tax
liability of each such foreign partner  for the partner's taxable year in  which
the  partner  is subject  to U.S.  tax on  the income  to which  the withholding
relates. Withheld amounts are treated as a  distribution on the last day of  the
partnership taxable year for which the withheld amount was paid (or, if earlier,
on the last day on which the partner owned an interest in the partnership).
 
    To  satisfy the above withholding obligation  with respect to the Mergers, a
Partnership may retain and place in  an escrow account, or similar  arrangement,
the  shares or cash to be received by  a foreign Unitholder, pending a sale of a
portion of the shares sufficient  to satisfy the withholding or,  alternatively,
the  receipt of an amount of cash  from the Unitholder sufficient to satisfy the
withholding.
 
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    BACKUP WITHHOLDING.  The Company will report to the stockholders and the IRS
the amount of dividends paid  during each calendar year,  and the amount of  tax
withheld,  if any.  Under the  backup withholding  rules, a  stockholder will be
subject to  backup withholding  equal to  31% of  the dividend  paid unless  the
stockholder (i) is a corporation or comes within certain other exempt categories
and,  when  required,  demonstrates  this  fact  or  (ii)  provides  a  taxpayer
identification number,  certifies  as  to  no  loss  of  exemption  from  backup
withholding  and otherwise complies  with applicable requirements  of the backup
withholding rules. A  stockholder that  does not  provide the  Company with  its
correct  taxpayer identification number may also be subject to penalties imposed
by the IRS. Any amount paid as backup withholding will be creditable against the
stockholder's income tax liability. In addition, the Company may be required  to
withhold  a portion of  capital gain distributions made  to any stockholders who
fail to certify their nonforeign status to the Company.
 
    STATE AND  LOCAL TAXES  AND  WITHHOLDING.   Unitholders  may be  subject  to
taxation  by state or  local jurisdictions, including those  states in which the
Partnerships in which they are a partner own real property or transact business,
on their allocable share of income  or loss of such Partnerships, including  any
gain  or  loss arising  from  the Mergers.  In  addition, certain  states impose
withholding  obligations   on   the   Partnerships  in   connection   with   the
above-described taxes. To satisfy this withholding obligation, a Partnership may
retain  and place in an  escrow account, or similar  arrangement, the shares and
cash, if any, to be received by a Unitholder, pending a sale of a portion of the
shares sufficient to satisfy the  withholding or, alternatively, the receipt  of
an amount of cash from the Unitholder sufficient to satisfy the withholding. The
Company  and its  stockholders will  be subject  to state  or local  taxation in
various state  or local  jurisdictions,  including those  in  which it  or  they
transact  business  or  reside.  The  state  and  local  tax  treatment  of  the
Unitholders, the Partnerships, the Company and its stockholders may not  conform
to   the  federal   income  tax  consequences   discussed  above.  Consequently,
Unitholders should consult their own tax advisors regarding the effect of  state
and local tax laws on the Mergers and on an investment in the Company.
 
                                 LEGAL MATTERS
 
    Latham  & Watkins,  Costa Mesa, California  has delivered an  opinion to the
effect that, upon the consummation of  the Mergers, the Shares offered  pursuant
to  this  Proxy  Statement/Prospectus will  be  validly issued,  fully  paid and
nonassessable. Perkins Coie, Seattle, Washington has delivered an opinion to the
effect that the  discussion under "Material  Federal Income Tax  Considerations"
fairly  summarizes the federal  income tax considerations that  are likely to be
material to a Unitholder whose Units are exchanged for Shares in a Merger.
 
                                    EXPERTS
 
    The  financial   statements  incorporated   by  reference   in  this   Proxy
Statement/Prospectus  from  the Company's  Annual Report  on  Form 10-K  for the
fiscal year  ended  December  31,  1995 and  the  financial  statements  of  the
Partnerships  for  the years  ended December  31, 1995,  1994 and  1993 included
herein have been  audited by  Deloitte &  Touche LLP,  independent auditors,  as
stated  in their reports which are incorporated herein by reference with respect
to the Company and  included herein with respect  to the Partnerships, and  have
been so incorporated or included in reliance upon the reports of such firm given
upon their authority as experts in accounting and auditing.
 
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                               GLOSSARY OF TERMS
 
    Certain  capitalized terms used in  this Proxy Statement/Prospectus have the
following meanings unless the context otherwise requires:
 
    "ACQUISITION AGREEMENT" means the Acquisition Agreement dated as of July  1,
1996 by and among the Company and the Partnerships.
 
    "ADDITIONAL CONSIDERATION" means the additional cash consideration which may
be paid by the Company if the Share Price is less than $21.50, calculated as the
difference  between the actual Share Price  and $21.50, multiplied by the number
of Shares to be issued in the applicable Merger.
 
    "ALEX. BROWN" means Alex. Brown  & Sons Incorporated, the financial  advisor
to the Special Committee.
 
    "ALEX.  BROWN OPINION" means the  opinion rendered by Alex.  Brown as to the
fairness to the Company,  from a financial point  of view, of the  consideration
payable by the Company in the Offers and the Mergers.
 
    "ALLOCATED  TRANSACTION EXPENSES" means 50% of the Shared Expenses allocated
among the Partnerships pro rata based upon their relative Net Asset Value.
 
    "APPRAISALS" means the  Summary Portfolio  Appraisal Report  dated June  26,
1996 relating to the Partnerships' real estate portfolios.
 
    "APPRAISED  VALUE" means the appraised fair market values of the real estate
assets of each Partnership as of December 31, 1995 set forth in the Appraisals.
 
    "BYLAWS" means the Bylaws of the Company, as amended.
 
    "CERTIFICATE OF INCORPORATION" means the Certificate of Incorporation of the
Company, as amended and restated.
 
    "CLASS B  COMMON STOCK"  means Class  B Common  Stock, par  value $.001  per
share, of the Company.
 
    "CLOSING  DATE" means the day on which  the closing of the applicable Merger
occurs.
 
    "CLOSING NET ASSET VALUE" with respect to each Partnership means (i) the sum
of (a)  the Appraised  Value,  (b) the  cost incurred  to  the Closing  Date  of
buildouts and unit conversions, if any, that were not reflected in the Appraised
Value,  and  (c) the  book  values of  the  non-real estate  assets,  except for
amortizable assets, of the Partnership as of the Closing Date of the  applicable
Merger, less (ii) the sum of (x) the Partnership's liabilities as of the Closing
Date,  (y)  the estimated  costs remaining  to be  incurred, if  any, as  of the
Closing Date to complete the buildouts  and unit conversions that were  included
in  the Appraised  Value and (z)  the Partnership's Individual  Expenses and pro
rata share of Shared Expenses.
 
    "CODE" means the Internal Revenue Code of 1986, as amended.
 
    "COMMISSION" means the Securities and Exchange Commission.
 
    "COMMON STOCK" means Class A Common Stock, par value $.001 per share, of the
Company, together with certain associated preferred stock purchase rights.
 
    "COMPANY" means Shurgard Storage Centers, Inc., a Delaware corporation.
 
    "CONSOLIDATION" means the consolidation on March 1, 1994 of 17 publicly held
real estate limited partnerships that were sponsored by the Management Company.
 
    "CONTINGENT SHARES AGREEMENT"  means the  agreement, dated  March 24,  1995,
between  the Company and the former shareholders of the Management Company, made
in connection with the Management Company Merger, whereby the former  Management
Company shareholders are entitled
 
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to  receive  shares  of  Common Stock  upon  the  sale or  transfer  of,  or the
occurrence of certain other events with  respect to, the Company's interests  in
certain limited partnerships formerly owned by the Management Company, including
the Partnerships.
 
    "DISSENTERS' RIGHTS STATUTE" means Section 25.10.900 et seq. of the WULPA.
 
    "DISSOLUTION"  means a dissolution  of a Partnership  in accordance with its
Partnership Agreement.
 
    "EFFECTIVE TIME" means, with respect to each Partnership, the effective time
of the applicable Merger.
 
    "EVEREST" means Everest Storage Investors, LLC.
 
    "EVEREST TENDER OFFER" means  a tender offer for  Units of the  Partnerships
commenced by Everest on February 28, 1996.
 
    "EVEREST  TENDERED UNITS" means  the 1,816.5 IDS1  Units, 1,913.5 IDS2 Units
and 1,582.5 IDS3 Units acquired by Everest through the Everest Tender Offer.
 
    "EVEREST UNITS" means the  total of 1,824.5 ISD1  Units, 2,038.3 IDS2  Units
and 1,602.5 IDS3 Units acquired by PS from Everest.
 
    "EXCESS  STOCK" means any Common Stock transferred in violation of the Board
of Directors of the Company stopping transfer and/or redeeming shares of  Common
Stock  under certain conditions  specified in the  Certificate of Incorporation.
Such Excess Stock has no voting or  distribution rights and the Company has  the
power to purchase or direct its sale.
 
    "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.
 
    "FFO" or "FUNDS FROM OPERATIONS," as promulgated by the National Association
of  Real Estate Investment  Trusts in its  March 1995 White  Paper on Funds from
Operations, means  net income  (calculated in  accordance with  GAAP)  excluding
gains  or  losses  from  debt  restructurings and  sales  of  real  estate, plus
depreciation of  rental  real  estate  and  amortization  of  intangible  assets
exclusive of deferred financing costs.
 
    "GAAP" means generally accepted accounting principles.
 
    "GENERAL  PARTNER  UNDERTAKING"  means  an  agreement  between  the  General
Partners and the Company pursuant to  which the General Partners agreed to  make
the  recommendations to Unitholders contained in this Proxy Statement/Prospectus
and agreed not to  withdraw such recommendations except  in accordance with  the
discharge of their fiduciary duties and as otherwise required by law.
 
    "GENERAL  PARTNER"  means, with  respect to  each  of the  Partnerships, the
entity serving as the general partner of that Partnership.
 
    "GP AGREEMENTS" means the  Agreement of Limited Partnership  of each of  the
General Partners.
 
    "GP   INTERESTS"  means  the  General  Partner   interest  of  each  of  the
Partnerships.
 
    "IDS1" means IDS/Shurgard Income Growth Partners L.P., a Washington  limited
partnership.
 
    "IDS1  GENERAL PARTNER" means Shurgard Associates L.P., a Washington limited
partnership and the general partner of IDS1.
 
    "IDS1 MERGER" means the merger of IDS1 with and into the Company.
 
    "IDS1 OFFER" means a cash  tender offer by the Company  for up to 65,000  of
the outstanding IDS1 Units at $257 net per IDS1 Unit.
 
    "IDS1  SPECIAL MEETING"  means the  special meeting  of holders  of the IDS1
Units to be held on November 13, 1996, at 10:00 a.m., local time, at 1201  Third
Avenue, Suite 2200, Seattle, Washington.
 
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    "IDS1 UNITHOLDERS" means the holders of IDS1 Units.
 
    "IDS1 UNITS" means units of limited partnership interest in IDS1.
 
    "IDS2"  means  IDS/Shurgard Income  Growth  Partners L.P.  II,  a Washington
limited partnership.
 
    "IDS2 GENERAL  PARTNER"  means Shurgard  Associates  L.P. II,  a  Washington
limited partnership and the general partner of IDS2.
 
    "IDS2 MERGER" means the merger of IDS2 with and into the Company.
 
    "IDS2  OFFER" means a cash  tender offer by the Company  for up to 49,000 of
the outstanding IDS2 Units at $222 net per IDS2 Unit.
 
    "IDS2 SPECIAL MEETING"  means the  special meeting  of holders  of the  IDS2
Units  to be held on November 13, 1996, at 10:00 a.m., local time, at 1201 Third
Avenue, Suite 2200, Seattle, Washington.
 
    "IDS2 UNITHOLDERS" means the holders of IDS2 Units.
 
    "IDS2 UNITS" means units of limited partnership interest in IDS2.
 
    "IDS3" means  IDS/Shurgard Income  Growth Partners  L.P. III,  a  Washington
limited partnership.
 
    "IDS3  GENERAL  PARTNER" means  Shurgard Associates  L.P. III,  a Washington
limited partnership and the general partner of IDS3.
 
    "IDS3 MERGER" means the merger of IDS3 with and into the Company.
 
    "IDS3 OFFER" means a cash  tender offer by the Company  for up to 52,000  of
the outstanding IDS3 Units at $308 net per IDS3 Unit.
 
    "IDS3  SPECIAL MEETING"  means the  special meeting  of holders  of the IDS3
Units to be held on November 13, 1996, at 10:00 a.m., local time, at 1201  Third
Avenue, Suite 2200, Seattle, Washington.
 
    "IDS3 UNITHOLDERS" means the holders of IDS3 Units.
 
    "IDS3 UNITS" means units of limited partnership interest in IDS3.
 
    "INDIVIDUAL  EXPENSES" means  expenses, including  legal fees  and expenses,
fees and expenses of investment bankers and other financial advisors, the  costs
of  the  Appraisals and  transfer  fees payable  by  the Company  for  the Units
acquired through the Offers. Individual Expenses incurred by the Company will be
paid by the Company  and Individual Expenses incurred  by a Partnership will  be
paid by the Partnership.
 
    "IPSC"  means IDS Partnership Services  Corporation, a Minnesota corporation
and a limited partner of each of the General Partners.
 
    "IRS" means the Internal Revenue Service.
 
    "MANAGEMENT COMPANY" means Shurgard Incorporated, which was merged with  and
into the Company on March 24, 1995.
 
    "MANAGEMENT  COMPANY MERGER" means the merger of the Management Company with
and into the Company on March 24, 1995.
 
    "MANAGEMENT SERVICES AGREEMENTS"  means the  Management Services  Agreements
between each of the Partnerships and the Company.
 
    "MERGER CONSIDERATION" means the Shares to be issued and the cash to be paid
in lieu of fractional shares of Common Stock and as Additional Consideration, if
any, in the applicable Merger.
 
    "MERGERS"  means the  merger of the  Partnerships with and  into the Company
pursuant to the Acquisition Agreement.
 
                                      147
<PAGE>
    "NASDAQ" means the Nasdaq National Market.
 
    "NET ASSET VALUE" with respect to each Partnership means (i) the sum of  (a)
the  Appraised Value  and (b)  the book  values of  the non-real  estate assets,
except for amortizable  assets, of the  Partnership as of  March 31, 1996,  less
(ii)  the sum of (x) the Partnership's liabilities as of March 31, 1996, (y) the
estimated cost  remaining  to be  incurred  as of  March  31, 1996  to  complete
in-progress  buildouts and unit conversions (the value of which were included in
the Appraised Value) and (z) the estimated  costs of the Offers and the  Mergers
that  would be borne  by the Partnership pursuant  to the Acquisition Agreement,
assuming the applicable Merger is consummated.
 
    "NONQUALIFYING INCOME" means income from  ancillary services which does  not
qualify under gross income tests for a REIT.
 
    "NYSE" means the New York Stock Exchange, Inc.
 
    "OFFERS"  means  the  IDS1  Offer,  the  IDS2  Offer  and  the  IDS3  Offer,
collectively.
 
    "PARTICIPATING  PARTNERSHIP"  means  each   Partnership  as  to  which   the
conditions to closing have been satisfied or waived.
 
    "PARTNERSHIP  AGREEMENT"  means  the  applicable  Partnership's  Amended and
Restated Agreement of Limited Partnership.
 
    "PARTNERSHIPS" means IDS1, IDS2 and IDS3, collectively.
 
    "PS" means Public Storage, Inc.
 
    "REGISTRATION STATEMENT" means the Registration Statement on Form S-4  filed
by  the Company with the Commission under the Securities Act with respect to the
shares to be issued upon consummation of the Mergers.
 
    "REIT" means a real estate investment trust.
 
    "REIT TAXABLE  INCOME" means  taxable income  of the  REIT computed  without
regard  to the dividends  paid deduction and  the Company's net  capital gain as
defined in Code Section 857(b)(2).
 
    "SECURITIES ACT" means the Securities Act of 1933, as amended.
 
    "SGPI" means Shurgard General Partner, Inc.
 
    "SHARE PRICE"  means the  average of  the per  share closing  prices of  the
Common  Stock on the NYSE  during the 20 consecutive  trading days ending on the
fifth trading day prior to the Vote Date.
 
    "SHARE PRICE RANGE" means the price  range between the lower limit  ($22.25)
and the upper limit ($27.75) of the Share Price.
 
    "SHARED  EXPENSES" means those expenses,  excluding the Individual Expenses,
that will be shared by the Company and the Partnerships.
 
    "SHARES" means the  shares of Common  Stock issuable by  the Company in  the
Mergers.
 
    "SJP  II" means Shurgard  Joint Partners II,  a joint venture  in which IDS1
holds a 70% interest and the Company holds a 30% interest.
 
    "SPECIAL COMMITTEE"  means a  special committee  of the  Company's board  of
directors consisting of two independent directors, Donald W. Lusk and Wendell J.
Smith.
 
    "SPECIAL  MEETINGS" means the meeting of  Unitholders to be held on November
13, 1996, at 10:00 a.m., local time, at 1201 Third Avenue, Suite 2200,  Seattle,
Washington.
 
    "SRA" means Shurgard Realty Advisors, Inc.
 
    "SSCI" means Shurgard Storage Centers, Inc., a Delaware corporation.
 
                                      148
<PAGE>
    "STANGER" means Robert A. Stanger & Co., Inc., the financial advisor to each
of the Partnerships.
 
    "STANGER  FAIRNESS OPINION"  means the  written opinion  dated July  1, 1996
rendered by Stanger as to the fairness to Unitholders, from a financial point of
view, of the Merger Consideration.
 
    "TENDERED UNITS" means the Units of a Partnership that were purchased by the
Company in the applicable Offer.
 
    "UBTI" means unrelated business  taxable income as  defined in Code  Section
512.
 
    "UNITHOLDERS"   means,   collectively,  the   IDS1  Unitholders,   the  IDS2
Unitholders and the IDS3 Unitholders.
 
    "UNITHOLDERS'  PREFERENCE"  means   a  cumulative   amount  of   Partnership
distributions  equal to their collective capital contributions plus a cumulative
noncompounded return  of  9% per  annum  on capital  contributions  received  by
Unitholders of a Partnership.
 
    "UNITS" means units of limited partnership interest in the Partnerships.
 
    "VOTE  DATE" means  the date the  General Partner of  a Partnership actually
calls for the vote to approve the applicable Merger.
 
    "WULPA" means the Washington Uniform Limited Partnership Act.
 
                                      149
<PAGE>
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<S>                                                                                    <C>
IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
    Independent Auditors' Report.....................................................        F-2
    Consolidated Balance Sheets......................................................        F-3
    Consolidated Statements of Earnings..............................................        F-4
    Consolidated Statements of Partners' Equity (Deficit)............................        F-5
    Consoldiated Statements of Cash Flows............................................        F-6
    Notes to Consolidated Financial Statements.......................................        F-7
IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
    Independent Auditors' Report.....................................................        F-9
    Balance Sheets...................................................................       F-10
    Statements of Earnings...........................................................       F-11
    Statements of Partners' Equity (Deficit).........................................       F-12
    Statements of Cash Flows.........................................................       F-13
    Notes to Financial Statements....................................................       F-14
IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
    Independent Auditors' Report.....................................................       F-17
    Balance Sheets...................................................................       F-18
    Statements of Earnings...........................................................       F-19
    Statements of Partners' Equity (Deficit).........................................       F-20
    Statements of Cash Flows.........................................................       F-21
    Notes to Financial Statements....................................................       F-22
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
General Partner and Limited Partners
IDS/Shurgard Income Growth Partners L.P.
Seattle, Washington
 
    We have audited the accompanying consolidated balance sheets of IDS/Shurgard
Income Growth Partners L.P. and subsidiary as of December 31, 1994 and 1995, and
the related consolidated 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 consolidated financial  statements present fairly,  in
all  material  respects, the  financial position  of IDS/Shurgard  Income Growth
Partners L.P. and subsidiary as of December  31, 1994 and 1995, and the  results
of  their operations  and their 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
 
                                      F-2
<PAGE>
                      CONSOLIDATED FINANCIAL STATEMENTS OF
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                                   ------------------------------
                                                                        1994            1995
                                                                   --------------  --------------  JUNE 30, 1996
                                                                                                   --------------
                                                                                                    (UNAUDITED)
<S>                                                                <C>             <C>             <C>
ASSETS:
  Cash and cash equivalents......................................  $    1,877,311  $      668,672  $      865,281
  Storage centers, net...........................................      29,770,641      28,760,097      28,270,167
  Other assets...................................................         280,497         294,954         258,941
  Amortizable assets, less accumulated amortization of
   $1,150,148, $1,154,322 and $1,156,409.........................          19,131          14,957          12,870
                                                                   --------------  --------------  --------------
      Total Assets...............................................  $   31,947,580  $   29,738,680  $   29,407,259
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
 
LIABILITIES AND PARTNERS' EQUITY (DEFICIT):
  Liabilities:
    Accounts payable.............................................          59,496         105,669          41,370
    Other accrued expenses.......................................          40,790          44,953         130,913
    Accrued transaction costs....................................                                         318,985
    Due to affiliates............................................          40,208          39,082          41,442
    Unearned rent and tenant deposits............................         172,231         174,935         177,828
    Note payable.................................................       1,451,399        --              --
                                                                   --------------  --------------  --------------
      Total Liabilities..........................................       1,764,124         364,639         710,538
 
  Minority interest in joint partnership.........................       2,795,612       2,481,862       2,448,602
 
  Partners' equity (deficit):
    Limited partners.............................................      27,657,121      27,186,240      26,574,383
    General partner..............................................        (269,277)       (294,061)       (326,264)
                                                                   --------------  --------------  --------------
      Total Partners' Equity.....................................      27,387,844      26,892,179      26,248,119
                                                                   --------------  --------------  --------------
      Total Liabilities and Partners' Equity.....................  $   31,947,580  $   29,738,680  $   29,407,259
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
</TABLE>
 
See notes to consolidated financial statements
 
                                      F-3
<PAGE>
                      CONSOLIDATED 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..............................  $   5,462,738  $   5,995,824  $   6,465,170  $   3,143,073  $   3,278,117
  Interest income.....................         28,570         60,204        107,234         49,929         19,210
                                        -------------  -------------  -------------  -------------  -------------
    Total Revenue.....................      5,491,308      6,056,028      6,572,404      3,193,002      3,297,327
 
EXPENSES:
  Operating...........................      1,325,571      1,383,594      1,493,285        753,276        756,936
  Property management fees............        327,766        359,655        387,904        188,698        197,126
  Depreciation and amortization.......      1,119,109      1,126,049      1,113,748        570,865        519,579
  Real estate taxes...................        502,219        490,913        465,662        223,883        252,485
  Interest............................         94,915         96,731        130,022         66,449             --
  Transaction costs...................                                                                    425,373
  Administrative......................        172,236        179,596        215,529        128,355        136,376
                                        -------------  -------------  -------------  -------------  -------------
    Total Expenses....................      3,541,816      3,636,538      3,806,150      1,931,526      2,287,875
 
Minority interest in joint partnership
 earnings.............................       (128,767)      (195,781)      (263,750)      (119,048)      (142,240)
                                        -------------  -------------  -------------  -------------  -------------
 
EARNINGS..............................  $   1,820,725  $   2,223,709  $   2,502,504  $   1,142,248  $     867,212
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
 
EARNINGS PER UNIT OF LIMITED
 PARTNERSHIP INTEREST.................  $       11.67  $       14.25  $       16.04  $        7.32  $        5.56
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
 
DISTRIBUTIONS PER UNIT OF LIMITED
 PARTNERSHIP INTEREST.................  $       15.16  $       17.03  $       19.22  $        9.53  $        9.69
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
</TABLE>
 
See notes to consolidated financial statements
 
                                      F-4
<PAGE>
             CONSOLIDATED STATEMENTS OF PARTNERS' EQUITY (DEFICIT)
 
<TABLE>
<CAPTION>
                                                                     LIMITED
                                                                    PARTNERS      GENERAL PARTNER      TOTAL
                                                                 ---------------  ---------------  --------------
<S>                                                              <C>              <C>              <C>
Balance, January 1, 1993.......................................   $  28,585,167    $    (220,433)  $   28,364,734
Distributions..................................................      (2,246,190)        (118,219)      (2,364,409)
Earnings.......................................................       1,729,689           91,036        1,820,725
                                                                 ---------------  ---------------  --------------
 
Balance, December 31, 1993.....................................      28,068,666         (247,616)      27,821,050
Distributions..................................................      (2,524,069)        (132,846)      (2,656,915)
Earnings.......................................................       2,112,524          111,185        2,223,709
                                                                 ---------------  ---------------  --------------
 
Balance, December 31, 1994.....................................      27,657,121         (269,277)      27,387,844
Distributions..................................................      (2,848,260)        (149,909)      (2,998,169)
Earnings.......................................................       2,377,379          125,125        2,502,504
                                                                 ---------------  ---------------  --------------
 
Balance, December 31, 1995.....................................      27,186,240         (294,061)      26,892,179
Distributions (unaudited)......................................      (1,435,708)         (75,564)      (1,511,272)
Earnings (unaudited)...........................................         823,851           43,361          867,212
                                                                 ---------------  ---------------  --------------
Balance, June 30, 1996 (unaudited).............................   $  26,574,383    $    (326,264)  $   26,248,119
                                                                 ---------------  ---------------  --------------
                                                                 ---------------  ---------------  --------------
</TABLE>
 
See notes to consolidated financial statements
 
                                      F-5
<PAGE>
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED DECEMBER 31,              SIX MONTHS ENDED JUNE 30,
                                                -------------------------------------------  -----------------------------
                                                    1993           1994           1995           1995            1996
                                                -------------  -------------  -------------  -------------  --------------
                                                                                                      (UNAUDITED)
<S>                                             <C>            <C>            <C>            <C>            <C>
OPERATING ACTIVITIES:
  Earnings....................................  $   1,820,725  $   2,223,709  $   2,502,504  $   1,142,428  $      867,212
    Adjustments to reconcile earnings to net
     cash provided by operating activities:
    Transaction costs.........................                                                                     425,373
    Minority interest in joint partnership
     earnings.................................        128,767        195,781        263,750        119,048         142,240
    Depreciation and amortization.............      1,119,109      1,126,049      1,113,748        570,865         519,579
    Changes in operating accounts:
      Other assets............................         85,209        (62,984)       (14,457)        66,933          36,013
      Accounts payable........................         (3,626)        14,142         46,173        (20,682)        (64,299)
      Other accrued expenses..................         10,837         (5,805)         4,163         76,494          85,960
      Due to affiliates.......................         (4,786)        12,689         (1,126)        (3,821)          2,360
      Unearned rent and tenant deposits.......         13,947          5,395          2,704         (3,722)          2,893
                                                -------------  -------------  -------------  -------------  --------------
Net cash provided by operating activities.....      3,170,182      3,508,976      3,917,459      1,947,543       2,017,331
                                                -------------  -------------  -------------  -------------  --------------
INVESTING ACTIVITIES:
  Proceeds from grant of easements............          7,599
  Improvements to storage centers.............       (118,994)      (136,846)       (99,030)        (9,997)        (27,562)
                                                -------------  -------------  -------------  -------------  --------------
    Net cash used in investing activities.....       (111,395)      (136,846)       (99,030)        (9,997)        (27,562)
                                                -------------  -------------  -------------  -------------  --------------
FINANCING ACTIVITIES:
  Payments on note payable....................        (41,096)       (44,587)    (1,451,399)       (14,553)
  Distributions to partners...................     (2,364,409)    (2,656,915)    (2,998,169)    (1,486,897)     (1,511,272)
  Distributions to minority partners in joint
   partnership................................       (225,000)       (75,000)      (577,500)      (318,000)       (175,500)
  Payment of transaction costs................                                                                    (106,388)
                                                -------------  -------------  -------------  -------------  --------------
    Net cash used in financing activities.....     (2,630,505)    (2,776,502)    (5,027,068)    (1,819,450)     (1,793,160)
                                                -------------  -------------  -------------  -------------  --------------
Increase (decrease) in cash and cash
 equivalents..................................        428,282        595,628     (1,208,639)       118,096         196,609
Cash and cash equivalents at beginning of
 year.........................................        853,401      1,281,683      1,877,311      1,877,311         668,672
                                                -------------  -------------  -------------  -------------  --------------
Cash and cash equivalents at end of year......  $   1,281,683  $   1,877,311  $     668,672  $   1,995,407  $      865,281
                                                -------------  -------------  -------------  -------------  --------------
                                                -------------  -------------  -------------  -------------  --------------
SUPPLEMENTAL DISCLOSURES OF CASH FLOW
 INFORMATION:
  Cash paid during year for interest..........  $      94,915  $      96,731  $     130,022  $      66,449  $           --
                                                -------------  -------------  -------------  -------------  --------------
                                                -------------  -------------  -------------  -------------  --------------
</TABLE>
 
See notes to consolidated financial statements
 
                                      F-6
<PAGE>
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    GENERAL:   IDS/Shurgard  Income Growth  Partners L.P.  (the Partnership) was
organized under the laws of  the State of Washington  on September 29, 1987,  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., a Washington limited partnership.
 
    As  of June 30, 1996, there were approximately 5,520 limited partners in the
Partnership. There  were  approximately  148,202 units  of  limited  partnership
interest outstanding at a contribution of $250 per unit.
 
    CONSOLIDATED  FINANCIAL STATEMENTS:   In 1988, the  Partnership and Shurgard
Income Properties -- Fund 18 ("Shurgard 18"), an affiliated partnership,  formed
a  joint venture,  Shurgard Joint Partners  II ("SJP II"),  which purchased four
self  storage  facilities   located  in  Detroit,   Michigan.  The   Partnership
contributed  70%  of the  funds  needed for  the  organization of  SJP  II, with
Shurgard 18 contributing the remaining 30%.
 
    On March 1, 1994, Shurgard 18 was merged into Shurgard Storage Centers, Inc.
("SSCI")  as  part  of  the  consolidation  of  17  Shurgard-sponsored   limited
partnerships.  As a result of the merger, SSCI succeeded to all of Shurgard 18's
interest in SJP II,  and assumed its obligations  as a partner. The  Partnership
consented  to SSCI's admission as a successor partner in SJP II. SSCI granted to
the Partnership the  right to sell  its interest in  SJP II at  any time in  the
future  to either  SSCI or,  at SSCI's request,  to any  wholly owned subsidiary
thereof, at a price mutually agreeable to the parties or, if no mutual agreement
could be reached, at a price determined through an appraisal process.
 
    The Partnership and  SSCI receive  cash distributions  from SJP  II and  are
allocated  all income, gain,  loss and credit in  proportion to their respective
capital contributions to SJP II.
 
    The  consolidated  financial   statements  include  the   accounts  of   the
Partnership  and SJP II. All material interpartnership transactions and balances
have been eliminated. The minority partner's interests in the joint  partnership
are shown separately on the accompanying consolidated financial statements.
 
    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 consolidated 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,  which  consist  primarily  of
noncompete covenants and loan  costs, are amortized  over their expected  useful
lives of two to five years.
 
    RENTAL  REVENUE:    Rental revenue  is  recognized as  earned  under accrual
accounting principles.
 
                                      F-7
<PAGE>
    TAXES ON INCOME:   The consolidated  financial statements do  not reflect  a
provision for federal income taxes because such taxes, including a proportionate
interest in any SJP II 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 (148,202 units for each of the three years ended December 31, 1995 and
the six months ended June 30, 1996 and 1995).
 
    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 (148,202 units  for each of the  three years ended December  31,
1995 and the six months ended June 30, 1996 and 1995).
 
    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.
At June 30, 1996, no assets had been written down.
 
    RECLASSIFICATION:  Certain items in the 1993 and 1994 consolidated financial
statements have been reclassified to conform with the current year presentation.
 
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.........................................  $    6,429,852  $    6,429,852  $    6,429,852
Buildings....................................      28,390,139      28,463,189      28,490,751
Equipment....................................       1,174,025       1,200,005       1,200,005
                                               --------------  --------------  --------------
                                                   35,994,016      36,093,046      36,120,608
Less accumulated depreciation................      (6,223,375)     (7,332,949)     (7,850,441)
                                               --------------  --------------  --------------
                                               $   29,770,641  $   28,760,097  $   28,270,167
                                               --------------  --------------  --------------
                                               --------------  --------------  --------------
</TABLE>
 
NOTE C -- NOTE PAYABLE
 
    At December 31, 1994,  the Partnership held a  seven-year note payable to  a
commercial  bank bearing interest at  7.75% per annum. On  December 6, 1995, the
Partnership repaid the balance of this note.
 
NOTE D -- TRANSACTIONS WITH AFFILIATES
 
    In connection  with the  management  of both  the  storage centers  and  the
Partnership,  the Partnership has paid or  accrued a monthly property management
fee equal to 6% of  the properties' gross revenue to  SSCI, an affiliate of  the
general  partner. On  March 24,  1995, Shurgard  Incorporated merged  with SSCI.
Prior to the merger date such fees were paid to Shurgard Incorporated.
 
                                      F-8
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
General Partner and Limited Partners
IDS/Shurgard Income Growth Partners L.P. II
Seattle, Washington
 
    We  have  audited the  accompanying  balance sheets  of  IDS/Shurgard Income
Growth Partners  L.P. II  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
 
                                      F-9
<PAGE>
                            FINANCIAL STATEMENTS OF
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 
                                 BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                                            DECEMBER 31,
                                                                   ------------------------------
                                                                        1994            1995
                                                                   --------------  --------------  JUNE 30, 1996
                                                                                                   --------------
                                                                                                    (UNAUDITED)
<S>                                                                <C>             <C>             <C>
ASSETS:
  Cash and cash equivalents......................................  $      384,867  $      455,167  $      443,848
  Storage centers, net...........................................      25,126,512      24,965,503      24,547,472
  Other assets...................................................         174,768         155,712         132,055
  Amortizable assets, less accumulated amortization of $279,821,
   $350,718 and $386,166.........................................         179,874         108,977          73,529
                                                                   --------------  --------------  --------------
      Total Assets...............................................  $   25,866,021  $   25,685,359  $   25,196,904
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
 
LIABILITIES AND PARTNERS' EQUITY (DEFICIT):
  Liabilities:
    Accounts payable and other accrued expenses..................  $      169,033  $      256,049  $      249,883
    Accrued transaction costs....................................                                         204,352
    Construction payable.........................................         173,572
    Unearned rent and tenant deposits............................         118,132         132,881
    Line of credit...............................................                         470,000         470,000
    Notes payable................................................       2,938,331       2,867,661       2,830,930
                                                                   --------------  --------------  --------------
      Total Liabilities..........................................       3,399,068       3,726,591       3,755,165
  Partners' equity (deficit):
    Limited partners.............................................      22,623,217      22,140,440      21,649,262
    General partner..............................................        (156,264)       (181,672)       (207,523)
                                                                   --------------  --------------  --------------
      Total Partners' Equity.....................................  $   22,466,953      21,958,768      21,441,739
                                                                   --------------  --------------  --------------
      Total Liabilities and Partners' Equity.....................  $   25,866,021  $   25,685,359  $   25,196,904
                                                                   --------------  --------------  --------------
                                                                   --------------  --------------  --------------
</TABLE>
 
See notes to financial statements.
 
                                      F-10
<PAGE>
                             STATEMENTS OF EARNINGS
 
<TABLE>
<CAPTION>
                                                  YEAR ENDED DECEMBER 31,             SIX MONTHS ENDED JUNE 30,
                                        -------------------------------------------  ----------------------------
                                            1993           1994           1995           1995           1996
                                        -------------  -------------  -------------  -------------  -------------
                                                                                             (UNAUDITED)
<S>                                     <C>            <C>            <C>            <C>            <C>
REVENUE:
  Rental..............................  $   3,617,849  $   4,037,720  $   4,308,603  $   2,064,659  $   2,255,157
  Interest Income.....................          3,549         19,765         11,044          3,773          9,659
                                        -------------  -------------  -------------  -------------  -------------
    Total Revenue.....................      3,621,398      4,057,485      4,319,647      2,068,432      2,264,816
EXPENSES:
  Operating...........................        786,459        875,926        943,532        465,686        505,508
  Property management fees............        217,121        242,259        258,253        123,879        135,129
  Depreciation........................        814,883        832,554        848,364        415,166        428,531
  Real estate taxes...................        337,741        327,337        324,450        180,558        173,888
  Interest............................        166,036        237,962        254,026        135,522        139,275
  Transaction costs...................                                                                    285,182
  Amortization........................         78,580         70,835         70,897         35,449         35,448
  Administrative......................        126,103        130,467        159,326         94,305         94,392
                                        -------------  -------------  -------------  -------------  -------------
    Total Expenses....................      2,526,923      2,717,340      2,858,848      1,450,565      1,797,353
EARNINGS..............................  $   1,094,475  $   1,340,145  $   1,460,799  $     617,867  $     467,463
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
EARNINGS PER UNIT OF LIMITED
 PARTNERSHIP INTEREST.................  $        9.03  $       11.06  $       12.06  $        5.10  $        3.86
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
DISTRIBUTIONS PER UNIT OF LIMITED
 PARTNERSHIP INTEREST.................  $       15.62  $       15.78  $       16.25  $        8.13  $        8.13
                                        -------------  -------------  -------------  -------------  -------------
                                        -------------  -------------  -------------  -------------  -------------
</TABLE>
 
See notes to financial statements.
 
                                      F-11
<PAGE>
                    STATEMENTS OF PARTNERS' EQUITY (DEFICIT)
 
<TABLE>
<CAPTION>
                                                                        LIMITED        GENERAL
                                                                        PARTNERS       PARTNER         TOTAL
                                                                     --------------  ------------  --------------
<S>                                                                  <C>             <C>           <C>
Balance, January 1, 1993...........................................  $   23,925,497  $    (87,721) $   23,837,776
Distributions......................................................      (1,798,591)      (94,664)     (1,893,255)
Earnings...........................................................       1,039,751        54,724       1,094,475
                                                                     --------------  ------------  --------------
 
Balance, December 31, 1993.........................................      23,166,657      (127,661)     23,038,996
Distributions......................................................      (1,816,578)      (95,610)     (1,912,188)
Earnings...........................................................       1,273,138        67,007       1,340,145
                                                                     --------------  ------------  --------------
 
Balance, December 31, 1994.........................................      22,623,217      (156,264)     22,466,953
Distributions......................................................      (1,870,536)      (98,448)     (1,968,984)
Earnings...........................................................       1,387,759        73,040       1,460,799
                                                                     --------------  ------------  --------------
 
Balance, December 31, 1995.........................................      22,140,440      (181,672)     21,958,768
Distributions (unaudited)..........................................        (935,268)      (49,224)       (984,492)
Earnings (unaudited)...............................................         444,090        23,373         467,463
                                                                     --------------  ------------  --------------
 
Balance, June 30, 1996 (unaudited).................................  $   21,649,262  $   (207,523) $   21,441,739
                                                                     --------------  ------------  --------------
                                                                     --------------  ------------  --------------
</TABLE>
 
See notes to financial statements.
 
                                      F-12
<PAGE>
                            STATEMENTS OF CASH FLOWS
 
<TABLE>
<CAPTION>
                                                        YEAR ENDED DECEMBER 31,                SIX MONTHS ENDED JUNE 30,
                                             ----------------------------------------------  -----------------------------
                                                  1993            1994            1995           1995            1996
                                             --------------  --------------  --------------  -------------  --------------
                                                                                                      (UNAUDITED)
<S>                                          <C>             <C>             <C>             <C>            <C>
OPERATING ACTIVITIES:
  Earnings.................................  $    1,094,475  $    1,340,145  $    1,460,799  $     617,867  $      467,463
  Adjustments to reconcile earnings to net
   cash provided by operating activities:
    Transaction costs......................                                                                        285,182
    Depreciation and amortization..........         893,463         903,389         919,261        450,615         463,979
    Changes in operating accounts:
      Other assets.........................         (22,696)        (41,692)         19,056         33,631          23,657
      Accounts payable and other accrued
       expenses............................        (212,815)         (1,861)         87,016        (21,765)       (133,880)
      Unearned rent and tenant deposits....          (1,796)         11,414          14,749          5,282          (5,167)
                                             --------------  --------------  --------------  -------------  --------------
  Net cash provided by operating
   activities..............................       1,750,631       2,211,395       2,500,881      1,085,630       1,101,234
INVESTING ACTIVITIES:
  Construction of and improvements to
   storage centers.........................        (809,619)       (430,410)       (860,927)      (722,275)        (10,500)
                                             --------------  --------------  --------------  -------------  --------------
FINANCING ACTIVITIES:
  Proceeds from (payments on) line of
   credit..................................       1,250,000      (1,250,000)        470,000        415,000
  Payment of loan costs....................          (2,671)        (38,021)
  Payment on notes payable.................         (38,555)        (66,982)        (70,670)       (32,205)        (36,731)
  Proceeds from notes payable..............                       1,250,000
  Distributions to partners................      (1,893,255)     (1,912,188)     (1,968,984)      (984,492)       (984,492)
  Payment of transaction costs.............                                                                        (80,830)
                                             --------------  --------------  --------------  -------------  --------------
  Net cash used in financing activities....        (684,481)     (2,017,191)     (1,569,654)      (601,697)     (1,102,053)
                                             --------------  --------------  --------------  -------------  --------------
(Decrease) increase in cash and cash
 equivalents...............................         256,531        (236,206)         70,300       (238,342)        (11,319)
Cash and cash equivalents at beginning of
 year......................................         364,542         621,073         384,867        384,867         455,167
                                             --------------  --------------  --------------  -------------  --------------
Cash and cash equivalents at end of year...  $      621,073  $      384,867  $      455,167  $     146,525  $      443,848
                                             --------------  --------------  --------------  -------------  --------------
                                             --------------  --------------  --------------  -------------  --------------
SUPPLEMENTAL DISCLOSURE OF CASH FLOW
 INFORMATION:
  Cash paid during year for interest.......  $      166,036  $      237,962  $      254,026  $     135,522  $      139,275
                                             --------------  --------------  --------------  -------------  --------------
                                             --------------  --------------  --------------  -------------  --------------
SUPPLEMENTAL DISCLOSURE OF NON-CASH
 INVESTING ACTIVITIES:
  Liabilities incurred in connection with
   the improvement and construction of
   storage centers.........................  $     --        $      173,572  $     --        $    --        $     --
                                             --------------  --------------  --------------  -------------  --------------
                                             --------------  --------------  --------------  -------------  --------------
</TABLE>
 
See notes to financial statements.
 
                                      F-13
<PAGE>
                         NOTES TO FINANCIAL STATEMENTS
 
NOTE A -- SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
    GENERAL:   IDS/Shurgard Income Growth Partners L.P. II (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. II, a Washington limited partnership.
 
    As  of June 30, 1996, there were approximately 3,990 limited partners in the
Partnership. There  were  approximately  115,100 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 Company, 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  of  loan  costs and
non-compete covenants, are amortized over  their expected useful lives of  three
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 (115,110 units for each of the three years ended December 31, 1995 and
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 (115,110 units  for each of the  three years ended December  31,
1995 and 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.
At June 30, 1996, no assets had been written down.
 
                                      F-14
<PAGE>
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.........................................  $    5,848,181  $    6,014,514  $    6,014,514
Building.....................................      22,381,990      22,762,245      22,772,745
Equipment....................................         732,213         872,980         872,980
                                               --------------  --------------  --------------
                                                   28,962,384      29,649,739      29,660,239
Less accumulated depreciation................      (3,835,872)     (4,684,236)     (5,112,767)
                                               --------------  --------------  --------------
                                               $   25,126,512  $   24,965,503  $   24,547,472
                                               --------------  --------------  --------------
                                               --------------  --------------  --------------
</TABLE>
 
    Construction in progress was $625,437 at  December 31, 1994 and is  included
in building.
 
NOTE C -- TRANSACTIONS WITH AFFILIATES
 
    In  connection  with the  management  of both  the  storage centers  and the
Partnership,  the  Partnership   has  paid  or   accrued  management   expenses,
reimbursements  and  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.
 
<TABLE>
<CAPTION>
                                                  YEAR ENDED DECEMBER 31,
                                           -------------------------------------
                                              1993         1994         1995
                                           -----------  -----------  -----------   JUNE 30,
                                                                                     1996
                                                                                  -----------
                                                                                  (UNAUDITED)
<S>                                        <C>          <C>          <C>          <C>
Partnership management expenses and
 reimbursement at cost...................  $    83,700  $    64,800  $    54,700   $  27,800
Property management fees.................      217,121      242,259      258,253     135,129
</TABLE>
 
NOTE D -- NOTES PAYABLE
 
<TABLE>
<CAPTION>
                                                           DECEMBER 31,
                                                   ----------------------------
                                                       1994           1995
                                                   -------------  -------------  JUNE 30, 1996
                                                                                 -------------
                                                                                  (UNAUDITED)
<S>                                                <C>            <C>            <C>
Note payable to a commercial bank. Secured by
 real estate and payable in monthly installments
 of $15,056, including principal and interest at
 8%, due October 1999. The note reprices in
 September 1997 and can be fixed for various
 periods at the Partnership's option.............  $   1,713,603  $   1,668,337  $   1,644,338
Note payable to a commercial bank. Secured by
 real estate and payable in monthly installments
 of $10,837, including principal and interest at
 8.25%, due March 2001. The note reprices in
 September 1996 and can be fixed for various
 periods at the Partnership's option.............      1,224,728      1,199,324      1,186,592
                                                   -------------  -------------  -------------
                                                   $   2,938,331  $   2,867,661  $   2,830,930
                                                   -------------  -------------  -------------
                                                   -------------  -------------  -------------
</TABLE>
 
                                      F-15
<PAGE>
    Based on the borrowing rates currently available to the Partnership for bank
loans  with similar terms  and average maturities,  the fair value  of the fixed
rate long-term debt which matures October,  1999 is estimated to be  $1,765,000.
The  note maturing March 2001 reprices  to market every six months, accordingly,
the recorded value approximates fair value.
 
    The approximate maturities of principal on these notes payable over the next
five years are as follows:
 
<TABLE>
<S>                                    <C>
1996.................................               $    78,207
1997.................................                    84,856
1998.................................                    92,071
1999.................................                    99,899
2000.................................                   108,395
thereafter...........................                 2,404,233
                                                    -----------
                                                    $ 2,867,661
                                                    -----------
                                                    -----------
</TABLE>
 
    On May 1, 1995, the Partnership  obtained an $850,000 non-revolving line  of
credit  with interest rate  of prime plus  one half percent  (9% at December 31,
1995), maturing May 1, 1997. During  the year, the Partnership drew $470,000  on
the line of credit in order to fund the Chesapeake expansion.
 
NOTE E -- LEASE
 
    The  Partnership leases  retail space at  the Kennydale storage  center to a
single tenant under a noncancellable  operating lease which expires October  31,
2003.  The  lease is  renewable at  current  market rates  at that  time. Future
minimum lease receipts are as follows:
 
<TABLE>
<S>                                    <C>
1996.................................               $   131,818
1997.................................                   136,948
1998.................................                   137,938
1999.................................                   126,084
2000.................................                   126,084
2001 to 2003.........................                   378,252
                                                    -----------
                                                    $ 1,037,124
                                                    -----------
                                                    -----------
</TABLE>
 
                                      F-16
<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
 
                                      F-17
<PAGE>
                            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
 
                                      F-18
<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
 
                                      F-19
<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
 
                                      F-20
<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
 
                                      F-21
<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.
 
                                      F-22
<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>
 
                                      F-23
<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.
 
                                      F-24
<PAGE>
                                                                      APPENDIX A
 
                             ACQUISITION AGREEMENT
 
                                  BY AND AMONG
 
                   IDS/SHURGARD INCOME GROWTH PARTNERS L.P.,
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 
                                      AND
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
                         (TOGETHER, THE "PARTNERSHIPS")
 
                                      AND
 
                         SHURGARD STORAGE CENTERS, INC.
 
                                (THE "COMPANY")
 
                                  JULY 1, 1996
 
                                      A-i
<PAGE>
                                    CONTENTS
 
<TABLE>
<C>        <S>                                                                            <C>
ARTICLE I.  THE OFFERS..................................................................          1
      1.1  The Offers...................................................................          1
      1.2  Conditions to Commencement of the Offers.....................................          1
      1.3  Actions and Agreements of the Partnerships and the Company...................          2
      1.4  Offer Documents..............................................................          2
      1.5  General Partner Recommendation...............................................          3
 
                                                                                                  3
ARTICLE II.  THE MERGER.................................................................
      2.1  The Merger...................................................................          3
      2.2  Effective Time of the Merger.................................................          3
      2.3  Certificate of Incorporation of the Surviving Corporation....................          3
      2.4  Bylaws of the Surviving Corporation..........................................          4
      2.5  Board of Directors and Officers of the Surviving Corporation.................          4
 
                                                                                                  4
ARTICLE III.  CONVERSION OF PARTNERSHIP INTERESTS IN THE MERGER.......................
      3.1  Merger Consideration.........................................................          4
      3.2  Certain Definitions..........................................................          4
      3.3  Distribution of Merger Consideration.........................................          5
      3.4  No Fractional Shares.........................................................          5
      3.5  Dissenting Units.............................................................          5
      3.6  Issuance of Certificates for REIT Shares.....................................          6
      3.7  Transfer of Units............................................................          6
 
                                                                                                  6
ARTICLE IV.  REPRESENTATIONS AND WARRANTIES.............................................
      4.1  Representations and Warranties of the Partnerships...........................          6
      4.2  Representations and Warranties of the Company................................          9
 
                                                                                                 11
ARTICLE V.  COVENANTS AND AGREEMENTS....................................................
      5.1  Ordinary Course; No Acquisitions or Dispositions.............................         11
      5.2  Distributions................................................................         11
      5.3  Amendment of Governing Documents.............................................         12
      5.4  Exclusivity..................................................................         12
      5.5  Other Actions................................................................         12
      5.6  Advise of Changes............................................................         13
      5.7  Meetings of Limited Partner..................................................         13
      5.8  Registration and Listing of REIT Shares......................................         13
      5.9  S-4 Registration Statement and Proxy Statement/Prospectus....................         13
      5.10 Consents and Approvals.......................................................         13
      5.11 Limitation on Number of REIT Shares Issued...................................         14
 
                                                                                                 14
ARTICLE VI.  CLOSING....................................................................
      6.1  Closing Date.................................................................         14
      6.2  Additional Closings..........................................................         14
      6.3  Further Acts.................................................................         14
 
                                                                                                 14
ARTICLE VII.  CONDITIONS................................................................
      7.1  Conditions to Each Party's Obligations.......................................         14
      7.2  Conditions to the Obligations of the Company.................................         15
      7.3  Conditions to the Obligations of the Partnerships............................         15
 
                                                                                                 16
ARTICLE VIII.  TERMINATION AND WAIVER...................................................
      8.1  Termination..................................................................         16
      8.2  Effect of Termination........................................................         17
      8.3  Fees and Expenses............................................................         17
      8.4  Extension; Waiver............................................................         19
</TABLE>
 
                                      A-ii
<PAGE>
<TABLE>
<C>        <S>                                                                            <C>
      8.5  No Survival of Representations and Warranties................................         19
 
                                                                                                 19
ARTICLE IX.  MISCELLANEOUS..............................................................
      9.1  Assignment of Contract.......................................................         19
      9.2  Risk of Loss.................................................................         19
      9.3  Entire Agreement; Modifications..............................................         19
      9.4  Notices......................................................................         19
      9.5  Interpretation...............................................................         20
      9.6  Captions.....................................................................         20
      9.7  Multiple Counterparts........................................................         20
      9.8  Binding Effect...............................................................         20
      9.9  Attorneys' Fees..............................................................         20
      9.10 No Waiver; Severability......................................................         21
      9.11 No Joint and Several Liability...............................................         21
      9.12 Applicable Law...............................................................         21
</TABLE>
 
Exhibit A  General Partner Undertaking
Exhibit B  Opinion of Counsel to the Partnerships
Exhibit C  Opinion of Special Counsel to the Company
 
                                     A-iii
<PAGE>
                                    GLOSSARY
 
    The  following is a list of the defined terms used in this Agreement and the
Sections in which such terms are defined:
 
<TABLE>
<CAPTION>
                     TERM                                          SECTION
<S>                                             <C>
Additional Consideration                        Section 3.2(c)
Agreement                                       Preamble
Alternative Transaction                         Section 8.3(c)
Appraised Value                                 Section 3.2(a)
Appraiser                                       Section 3.2(a)
Assets                                          Recital A
Balance Sheet                                   Section 4.1(i)
Closing                                         Section 6.1
Closing Date                                    Section 6.1
Closing Net Asset Value                         Section 5.2
Commission                                      Section 1.4
Company                                         Preamble
Company SEC Documents                           Section 4.2(f)
Constituent Entities                            Section 2.1
DGCL                                            Section 2.1
Dissenting Units                                Section 3.5
Dissolution                                     Section 3.1(a)
Effective Time                                  Section 2.2
Exchange Act                                    Section 1.1
Exchange Agent                                  Section 3.3
Exchange Fund                                   Section 3.3
General Partner                                 Recital B
General Partner Recommendation                  Section 1.5
General Partner Undertaking                     Recital C
Governmental Regulations                        Section 4.1(l)
GP Interest                                     Section 3.1(b)
Hazardous Materials                             Section 4.1(l)
IDS1                                            Preamble
IDS2                                            Preamble
IDS3                                            Preamble
Individual Transaction Expenses                 Section 8.3(a)
LP Units                                        Section 1.1
Merger                                          Section 2.1
Merger Consideration                            Section 3.1
Net Asset Value                                 Section 3.2(a)
NYSE                                            Section 3.2(b)
Offer                                           Section 1.1
Offer Documents                                 Section 1.4
Offer Price                                     Section 1.1
Participating Partnership                       Section 2.1
Partnership                                     Preamble
Partnership Agreement                           Section 4.1(a)
Partnership Financial Statements                Section 4.1(e)
Partnership SEC Documents                       Section 4.1(d)
Property                                        Recital A
Proxy Statement/Prospectus                      Section 5.9
REIT Share Price                                Section 3.2(b)
REIT Share Price Range                          Section 3.2(b)
</TABLE>
 
                                      A-iv
<PAGE>
<TABLE>
<CAPTION>
                     TERM                                          SECTION
REIT Shares                                     Section 3.1(a)
<S>                                             <C>
S-4 Registration Statement                      Section 4.1(f)
Schedules                                       Section 1.4
Schedules 13E-3                                 Section 1.4
Schedules 14D-1                                 Section 1.4
Schedules 14D-9                                 Section 1.4
Securities Act                                  Section 4.1(d)
Shared Transaction Expenses                     Section 8.3(a)
Special Committee                               Section 1.2
Standstill                                      Section 1.3(d)
Surviving Corporation                           Section 2.1
Terminating Breach                              Section 8.1(f)
Third Party                                     Section 8.3(c)
WULPA                                           Section 2.1
</TABLE>
 
                                      A-v
<PAGE>
                             ACQUISITION AGREEMENT
 
    This ACQUISITION AGREEMENT (this "Agreement") is entered into as of July  1,
1996  by IDS/ Shurgard Income Growth Partners L.P. ("IDS1"), IDS/Shurgard Income
Growth Partners L.P. II  ("IDS2") and IDS/Shurgard  Income Growth Partners  L.P.
III   ("IDS3"),  each   a  Washington   limited  partnership   (individually,  a
"Partnership" and together, the  "Partnerships"), and Shurgard Storage  Centers,
Inc., a Delaware corporation (the "Company").
 
                                    RECITALS
 
    A.    The Partnerships  are the  owners  of certain  self storage  and other
properties (which  properties,  including  any buildings,  structures  or  other
improvements  situated thereon  are herein  referred to  as the  "Property") and
related personal  property and  other assets  (together with  the Property,  the
"Assets").
 
    B.    Shurgard Associates  L.P., Shurgard  Associates  L.P. II  and Shurgard
Associates L.P.  III  (each, a  "General  Partner" and  together,  the  "General
Partners")  and the Board of Directors of the  Company believe that it is in the
best interests  of the  Partnerships and  the Company,  respectively, and  their
respective  limited partners and stockholders to  enter into and consummate this
Agreement.
 
    C.  Concurrently with the execution of this Agreement, the General  Partners
and  the Company are  entering into a  General Partner Undertaking,  dated as of
July 1, 1996 (the "General Partner Undertaking"), in the form attached hereto as
Exhibit A.
 
                                   AGREEMENTS
 
    NOW, THEREFORE, in consideration of the mutual representations,  warranties,
covenants and agreements set forth herein, the parties hereto agree as follows:
 
ARTICLE I.  THE OFFERS
 
    1.1  THE OFFERS
 
    As  soon as  practicable after the  date hereof, the  Company shall commence
(within the meaning of Rule 14d-2(a) of the Securities Exchange Act of 1934,  as
amended  (the "Exchange Act")), a tender offer for up to 65,000 units of limited
partner interests (the "LP Units") of IDS1,  49,000 LP Units of IDS2 and  52,000
LP  Units of IDS3  (each, an "Offer" and  together the "Offers"),  at a net cash
price per LP Unit  equal to the  Net Asset Value (as  defined in Section  3.2(a)
hereof)  of the applicable Partnership that would be allocated to one LP Unit if
the Partnership's Net  Asset Value  were distributed  in a  dissolution of  such
Partnership  in accordance with its Partnership Agreement (as defined in Section
4.1(a) hereof). The parties hereto acknowledge  that the Net Asset Value per  LP
Unit  is equal  to $257,  $222 and  $308 for  IDS1, IDS2  and IDS3, respectively
(each, the "Offer Price" and together  the "Offer Prices"). The Company may  not
change  the form of consideration, reduce the  Offer Price or amend any material
term of an Offer in a manner adverse to the interests of the limited partners of
the applicable  Partnership without  the prior  written consent  of the  General
Partner  of  such Partnership.  The Company  agrees to  use its  reasonable best
efforts to consummate the Offers as soon as legally permissible and, subject  to
the terms and conditions of the Offers, to accept for payment and pay for all LP
Units  tendered pursuant to the Offers  promptly following the expiration of the
Offers.
 
    1.2  CONDITIONS TO COMMENCEMENT OF THE OFFERS
 
    The commencement of the Offers is conditioned upon:
 
    (a) the receipt by the  Special Committee of the  Board of Directors of  the
Company appointed to review the transactions contemplated by this Agreement (the
"Special  Committee") of an opinion  from Alex. Brown &  Sons Incorporated as to
the fairness  to the  Company, from  a financial  point of  view, of  the  Offer
Prices;
 
                                      A-1
<PAGE>
    (b)  the receipt by  each of the  Partnerships of an  opinion from Robert A.
Stanger &  Co.,  Inc., as  to  the fairness  to  the limited  partners  of  such
Partnership, from a financial point of view, of the applicable Offer Price; and
 
    (c)  the General Partners  shall have executed and  delivered to the Company
the General  Partner  Undertaking and  shall  have performed  their  obligations
thereunder  that are  capable of  being performed  prior to  commencement of the
Offers.
 
    1.3  ACTIONS AND AGREEMENTS OF THE PARTNERSHIPS AND THE COMPANY
 
    (a) The Partnerships hereby consent to the making of the Offers.
 
    (b) The Partnerships shall promptly cause  to be furnished to the Company  a
list  containing the  names and addresses  of all record  holders and beneficial
owners known to them of LP Units as of a recent date, and shall promptly furnish
the Company with such  additional information and such  other assistance as  the
Company or its agents may reasonably request in connection with the Offers.
 
    (c)  The Partnerships and the Company will take such actions as are required
under the  applicable  Partnership Agreement  to  effect the  admission  of  the
Company  as a limited  partner of the  Partnership with respect  to all LP Units
acquired by it pursuant to the applicable Offer in accordance with the terms  of
the Partnership Agreement.
 
    (d)  The  Company agrees  that if  it  is admitted  as a  substitute limited
partner in a Partnership and except as otherwise contemplated by this Agreement,
it will not,  directly or  indirectly, without the  prior written  consent of  a
majority  of the general partners of the General Partner of that Partnership (i)
acquire any additional LP Units of that Partnership, (ii) propose any merger  or
other  business  combination involving  that Partnership,  or (iii)  propose any
other transaction  pursuant to  which it  would control  or acquire  any of  the
assets   of  that  Partnership   (this  agreement  being   referred  to  as  the
"Standstill").
 
    1.4  OFFER DOCUMENTS
 
    On the date of commencement of the  Offers, (a) the Company shall file  with
the  Securities and Exchange  Commission (the "Commission")  with respect to the
Offers, (i) a Tender Offer Statement on  Schedule 14D-1 with respect to each  of
the  Partnerships  (together with  any  supplements or  amendments  thereto, the
"Schedules 14D-1") and (ii) jointly with  each of the Partnerships (if  required
by  the Exchange Act), a Transaction  Statement on Schedule 13E-3 (together with
any supplements  or amendments  thereto,  the "Schedules  13E-3") and  (b)  each
Partnership  shall  file  with  the  Commission  with  respect  to  the  Offer a
Solicitation/Recommendation Statement  on  Schedule  14D-9  (together  with  any
supplements  or amendments thereto, the  "Schedules 14D-9"; the Schedules 14D-1,
the Schedules 13E-3 and the Schedules 14D-9 are referred to collectively as  the
"Schedules")  and, jointly with  the Company (if required  by the Exchange Act),
shall file  with the  Commission the  applicable Schedule  13E-3. The  Schedules
14D-1  and the Schedules  13E-3 will contain  (including as an  exhibit) or will
incorporate by reference an offer to  purchase (or portions thereof) and a  form
of  the  related  letter  of transmittal  (which  documents,  together  with any
supplements or  amendments  thereto  and  any other  documents  filed  with  the
Commission  or disseminated to  holders of LP  Units by the  Company pursuant to
which  the  Offers  are  made,  are  referred  to  collectively  as  the  "Offer
Documents").
 
    The  Partnerships and the Company shall  cooperate with each other and shall
supply each other with any assistance that the other shall reasonably request in
preparing and  filing  the  Schedules  and  distributing  the  Offer  Documents,
including, without limitation, supplying each other with any and all information
that  is required to be  furnished in the Schedules.  The Company may include in
the Offer Documents any  information with respect to  the Partnerships that  the
Company  shall reasonably determine  is required under the  Exchange Act and the
rules promulgated thereunder to  be included in the  Offer Documents, with  such
qualifications   and   disclaimers   as  are   reasonably   acceptable   to  the
 
                                      A-2
<PAGE>
applicable Partnership. The Company represents and warrants to the Partnerships,
and  each  Partnership  represents  and  warrants  to  the  Company,  that   the
information  provided by it, and to be provided  by it for use in the Schedules,
shall not, on the date the Schedules  are filed with the Commission, and on  the
date  the Offer Documents  are first published,  sent or given  to holders of LP
Units, as the case may  be, contain any untrue statement  of a material fact  or
omit  to state any material  fact required to be  stated therein or necessary in
order to make the statements therein, in light of the circumstances under  which
they   were  made,  not  misleading.  The  Company  shall  promptly  notify  the
Partnerships of, and shall promptly correct, and the Partnerships shall promptly
notify the Company of, and shall  promptly correct, any information provided  by
it  for use in the Schedules that shall  have become untrue or misleading in any
material respect and shall take all steps necessary to cause the Schedules as so
corrected to be  filed with  the Commission and  disseminated to  holders of  LP
Units,  in each  case to  the extent  required by  applicable federal securities
laws.
 
    1.5  GENERAL PARTNER RECOMMENDATION
 
    The Offer  Documents, the  Schedules  14D-9 and  the Schedules  13E-3  shall
contain,  to the extent  applicable, at all  times from the  commencement of the
Offers through the consummation of the Offers the recommendation of the  General
Partner  set  forth  in Section  1.2  of  the General  Partner  Undertaking (the
"General Partner Recommendation"), unless the  General Partner has withdrawn  or
changed  such recommendation  in accordance with  the exercise  of its fiduciary
duties or as otherwise required by law.
 
ARTICLE II.  THE MERGER
 
    2.1  THE MERGER
 
    Upon the terms and subject to  the conditions hereof, at the Effective  Time
(as  defined in Section 2.2 hereof), each Partnership as to which the conditions
to closing set forth in Article VII hereof have been met (each such Partnership,
a "Participating Partnership") shall be merged (the "Merger") with and into  the
Company  in accordance  with the applicable  provisions of  the Delaware General
Corporation Law (the "DGCL") and the Washington Uniform Limited Partnership  Act
(the  "WULPA"). When the Merger has been effected the Participating Partnerships
and the  Company  (together,  the  "Constituent  Entities")  will  be  a  single
corporation;  the separate existence  of each of  the Participating Partnerships
will cease; the Company, as the corporation surviving the Merger (the "Surviving
Corporation"), will continue its corporate existence under the DGCL; all  Assets
and  every other interest of or belonging to or due to each of the Participating
Partnerships will be  deemed to be  transferred to and  vested in the  Surviving
Corporation  without further  act or  deed; the  title to  the Property,  or any
interest therein, vested in any of  the Constituent Entities will not revert  or
be  in any way impaired  by reason of the  Merger; and the Surviving Corporation
will  thenceforth  be  responsible  and  liable  for  all  the  liabilities  and
obligations of each of the Constituent Entities.
 
    2.2  EFFECTIVE TIME OF THE MERGER
 
    The  Merger will  become effective when  a properly  executed Certificate of
Merger is duly filed with the Secretary  of State of Delaware and the  Secretary
of  State of Washington, which filing will  be made as soon as practicable after
the closing of  the transactions  contemplated by this  Agreement in  accordance
with  Section 6.1 hereof. When used in this Agreement, the term "Effective Time"
means the date and time on which such Certificate is so filed.
 
    2.3  CERTIFICATE OF INCORPORATION OF THE SURVIVING CORPORATION
 
    At the Effective Time,  and without any  further action on  the part of  the
Constituent  Entities,  the Certificate  of  Incorporation of  the  Company will
continue in effect and will be the Certificate of Incorporation of the Surviving
Corporation and thereafter may  be amended in accordance  with its terms and  as
provided by law.
 
                                      A-3
<PAGE>
    2.4  BYLAWS OF THE SURVIVING CORPORATION
 
    At  the Effective Time,  and without any  further action on  the part of the
Constituent Entities, the Bylaws of the Company will continue in effect  without
amendment and will be the Bylaws of the Surviving Corporation and thereafter may
be  amended or repealed  in accordance with  their terms and  the Certificate of
Incorporation of the Surviving Corporation and as provided by law.
 
    2.5  BOARD OF DIRECTORS AND OFFICERS OF THE SURVIVING CORPORATION
 
    At the Effective Time, the persons serving as directors of the Company  will
be  the directors of the  Surviving Corporation, each of  such directors to hold
office, subject to the applicable provisions of the Certificate of Incorporation
and Bylaws of  the Surviving Corporation,  until the expiration  of the  current
term  for which they  are serving as  a director and  until their successors are
duly elected or appointed and qualified. The officers of the Company immediately
prior to the Effective  Time will be the  officers of the Surviving  Corporation
until their respective successors are duly elected or appointed and qualified.
 
ARTICLE III.  CONVERSION OF PARTNERSHIP INTERESTS IN THE MERGER
 
    3.1  MERGER CONSIDERATION
 
    At the Effective Time, and subject to Sections 3.4 and 3.5 hereof, by virtue
of  the Merger and without any further action by the limited partners or General
Partners of the Participating Partnerships,
 
    (a) each LP Unit (other than LP Units  owned by the Company) of each of  the
Participating  Partnerships will be converted into the right to receive (i) that
number of shares of  Class A Common  Stock of the Company,  par value $.001  per
share  (the "REIT Shares"), derived by dividing  the Net Asset Value (as defined
in Section 3.2(a) hereof) of the applicable Participating Partnership that would
be allocated  to  one  LP  Unit  if such  Partnership's  Net  Asset  Value  were
distributed  in  a  dissolution  of  such  Partnership  in  accordance  with its
Partnership Agreement, taking into account  all outstanding LP Units,  including
those  owned  by the  Company (a  "Dissolution"),  by the  REIT Share  Price (as
defined in Section 3.2(b) hereof) and (ii) if any is payable, the amount of  the
Additional  Consideration (as  defined in Section  3.2(c) hereof)  that would be
allocated to one LP Unit if  the Additional Consideration were distributed in  a
Dissolution;
 
    (b)  the  General  Partner  interest  (the "GP  Interest")  of  each  of the
Participating Partnerships will be converted into the right to receive (i)  that
number  of REIT Shares derived by dividing the Net Asset Value of the applicable
Participating Partnership that  would be allocated  to the GP  Interest if  such
Partnership's Net Asset Value was distributed in a Dissolution by the REIT Share
Price  and (ii) if  any is payable,  the amount of  the Additional Consideration
that would be allocated to the GP Interest if the Additional Consideration  were
distributed in a Dissolution; and
 
    (c) the LP Units owned by the Company shall be canceled.
 
(The  REIT Shares issuable  pursuant to the  Merger, together with  cash paid in
lieu of  fractional  REIT Shares  as  provided in  Section  3.4 hereof  and  any
Additional Consideration, if any, that is payable, are referred to herein as the
"Merger  Consideration.") If,  prior to the  Effective Time,  the Company should
split or combine the REIT  Shares, or pay a stock  dividend, the number of  REIT
Shares  issuable in  the Merger will  be appropriately adjusted  to reflect such
action.
 
    3.2  CERTAIN DEFINITIONS
 
    (a) As used herein,  "Net Asset Value"  means, with respect  to each of  the
Partnerships,  (i) the sum of  (A) the appraised fair  market values of the real
estate assets  of the  Partnership as  of December  31, 1995  set forth  in  the
Portfolio Appraisal Reports dated June 26, 1996 (the "Appraised Value") prepared
by  Robert  A. Stanger  &  Co., Inc.  (the  "Appraiser"), which  Appraised Value
reflected the value of in-progress unit  conversions and buildouts, and (B)  the
book values of the non-real estate assets, except for amortizable assets, of the
Partnership  as of March 31,  1996, less (ii) the  sum of (X) such Partnership's
liabilities as  of  March 31,  1996,  (Y) the  estimated  cost remaining  to  be
incurred
 
                                      A-4
<PAGE>
as of March 31, 1996 to complete in-progress unit conversions and buildouts, the
value  of which was included in the  Appraised Value and (Z) the estimated costs
of the Offer and the Merger that would be borne by the Partnership in accordance
with Article VIII hereof, assuming the Merger is consummated.
 
    (b) As used herein, "REIT  Share Price" means, with  respect to each of  the
Partnerships,  the average of the per share closing prices on the New York Stock
Exchange, Inc. (the  "NYSE") of REIT  Shares during the  20 consecutive  trading
days  ending on the fifth trading day prior to the day of the meeting of limited
partners of the  applicable Partnership  on which the  General Partner  actually
calls  for  the  vote  of  the  limited  partners  to  approve  of  the  Merger.
Notwithstanding the foregoing, in the event the REIT Share Price exceeds $27.75,
then for purposes of calculating the number of REIT Shares to be issued pursuant
to Section 3.1 hereof the REIT Share Price shall be deemed to equal $27.75; and,
in the event  the REIT Share  Price is less  than $22.25, then  for purposes  of
calculating  the number of REIT Shares to be issued pursuant to this Section 3.2
the REIT Share Price shall be deemed  to equal $22.25 (the range of prices  from
the upper to the lower limit on the REIT Share Price is referred to as the "REIT
Share  Price Range"). The parties hereto acknowledge  that in the event the REIT
Share Price exceeds $28.50, the Company may terminate this Agreement as provided
in Section 8.1(e)(iv) hereof, and in the event the REIT Share Price is less than
$21.50, the  Partnership may  terminate this  Agreement as  provided in  Section
8.1(h) hereof unless the Company agrees to pay the Additional Consideration.
 
    (c)  As used herein, "Additional Consideration"  means, with respect to each
of the Partnerships,  that amount of  cash equal to  the difference between  the
REIT  Share Price calculated  without regard to  the REIT Share  Price Range and
$21.50, multiplied by the number of REIT Shares issuable pursuant to the Merger.
 
    3.3  DISTRIBUTION OF MERGER CONSIDERATION
 
    Prior to  the Effective  Time, the  Company shall  deposit (or  cause to  be
deposited)  with Gemisys Corporation, as  exchange agent (the "Exchange Agent"),
for the  benefit  of  the General  Partners  and  the limited  partners  of  the
Participating  Partnerships for exchange in accordance  with this Article III, a
number of REIT Shares and that amount of cash as is sufficient to pay the Merger
Consideration (such REIT Shares  and cash being hereinafter  referred to as  the
"Exchange  Fund"). The REIT Shares into which LP Units and GP Interests shall be
converted in the Merger  shall be deemed  to have been  issued at the  Effective
Time.
 
    3.4  NO FRACTIONAL SHARES
 
    No  fractional REIT Shares will be issued  in the Merger. In the event that,
as a result of the  conversion of LP Units or  GP Interests into REIT Shares,  a
limited  partner or General  Partner, as the  case may be,  would be entitled to
receive a fractional REIT Share, a cash  adjustment will be paid in lieu of  any
fractional  REIT Share that would otherwise be  issuable, and the amount of such
cash adjustment shall equal the product  of such fractional amount and the  REIT
Share  Price. The determination under  this Section 3.4 as  to whether a limited
partner would otherwise be entitled to  receive a fractional REIT Share will  be
based  on the  aggregate number of  LP Units  such limited partner  holds in the
applicable Partnership, not on a per LP Unit basis.
 
    3.5  DISSENTING UNITS
 
    Notwithstanding anything in this Agreement to the contrary, LP Units held by
a limited partner  who has  properly exercised dissenters'  rights with  respect
thereto ("Dissenting Units") in accordance with Section 25.10.900 ET SEQ. of the
WULPA  will not be converted into the right to receive the Merger Consideration,
but the holder thereof will instead be  entitled to receive payment of the  fair
value of such LP Units in accordance with the provisions of the WULPA unless and
until  such holder fails  to perfect or  has effectively withdrawn  or lost such
holder's rights to receive fair value  under the WULPA. If, after the  Effective
Time,  any holder of Dissenting  Units withdraws or loses  (through a failure to
perfect or otherwise) such holder's right to receive fair value with respect  to
the Dissenting Units, such Dissenting Units will automatically be converted into
the right to receive the Merger
 
                                      A-5
<PAGE>
Consideration  pursuant to Section  3.1 hereof. The  Partnerships shall give the
Company prompt notice of any  demands received by them  for the receipt of  fair
value  for LP Units and, prior to the  Effective Time, the Company will have the
right to participate in  all negotiations and proceedings  with respect to  such
demands.  Prior to the Effective Time, the Partnerships may not, except with the
Company's prior written consent, make any payment with respect to, or settle  or
offer to settle, any such demands.
 
    3.6  ISSUANCE OF CERTIFICATES FOR REIT SHARES
 
    As  soon as  practicable after the  Effective Time, the  Exchange Agent will
advise the beneficial owners of LP  Units of a Participating Partnership of  the
effectiveness  of the  Merger and  will distribute  the Merger  Consideration in
accordance with  instructions  given by  such  beneficial owners.  None  of  the
Company,  the Partnerships, the Surviving Corporation, the Exchange Agent or any
other person shall be liable  to any former holder of  LP Units or GP  Interests
for  any amount properly  delivered to a public  official pursuant to applicable
abandoned property, escheat or similar laws.
 
    Any  portion  of  the  Exchange  Fund  (including  the  proceeds  from   any
investments  thereof and any  REIT Shares) that remains  unclaimed by the former
partners of the Participating Partnerships  six months after the Effective  Time
shall  be  delivered to  the Surviving  Corporation. Any  former partner  of the
Participating Partnerships who  has not theretofore  complied with this  Article
III  shall thereafter look only to the  Surviving Corporation for payment of the
applicable Merger Consideration and  unpaid dividends and distributions  payable
with respect thereto, in each case without any interest thereon.
 
    3.7  TRANSFER OF UNITS
 
    There  will  be no  further registration  of  transfers of  LP Units  on the
Partnerships' records after the commencement of the Offers and until the Closing
(as defined in Section 6.1 hereof) or termination of this Agreement, except  for
the  transfer of LP  Units to the  Company pursuant to  the Offers and custodial
transfers, intrafamily  transfers,  including  transfers  to  trusts,  transfers
pursuant  to divorce decrees and transfers  relating to deaths or settlements of
estates.
 
ARTICLE IV.  REPRESENTATIONS AND WARRANTIES
 
    4.1  REPRESENTATIONS AND WARRANTIES OF THE PARTNERSHIPS
 
    For the purposes of inducing the Company to enter into this Agreement and to
consummate the  Merger,  each  of  the  Partnerships  severally  represents  and
warrants to the Company as follows with respect to itself and its Assets:
 
    (a)   ORGANIZATION.  The Partnership is a limited partnership duly organized
and validly existing under the laws of the state of Washington. The  Partnership
has  provided  the Company  with a  true and  complete copy  of its  Amended and
Restated Agreement  of  Limited  Partnership  and  all  amendments  thereto  (as
amended, the "Partnership Agreement"). The Partnership has no direct or indirect
equitable or beneficial ownership interest in any other entity, except as may be
disclosed in the Partnership SEC Documents (as defined hereof).
 
    (b)   POWER AND AUTHORITY.  The Partnership (i) has the authority to conduct
its business as currently conducted and  to own and operate the properties  that
it  now owns and operates, (ii) is qualified to do business in all jurisdictions
in which such  qualification is  necessary, except where  the failure  to be  so
qualified would not have a material adverse effect on the Partnership, and (iii)
has  all requisite power, authority and legal right to enter into this Agreement
and to consummate the  Merger. The execution and  delivery of this Agreement  by
the  Partnership and, subject to  the approval of this  Agreement by the limited
partners of the Partnership, the consummation  by the Partnership of the  Merger
have been duly authorized by all necessary partnership action on the part of the
Partnership,  and this Agreement is a legal, valid and binding obligation of the
Partnership, enforceable against the Partnership in accordance with its terms.
 
                                      A-6
<PAGE>
    (c)   NO VIOLATIONS.   Except  to the  extent that  lender consents  may  be
required  from mortgagees having liens against  the Property and except for such
other consents as have been obtained or  will be obtained prior to the  Closing,
and  assuming  approval  of  this  Agreement  by  the  limited  partners  of the
Partnership, the  execution and  delivery  of this  Agreement  do not,  and  the
consummation  of the Merger and compliance  with the provisions hereof will not,
result in any breach or violation of any (i) agreement to which the  Partnership
is  a party  or by  which it  or any of  its Assets  may be  bound, (ii) permit,
license or other governmental authorization applicable to the Partnership or its
Assets, or (iii)  judgment, order,  law, rule  or regulation  applicable to  the
Partnership  or its Assets, other  than any such items  that in the aggregate do
not have a material adverse effect  on the Partnership's ability to perform  its
obligations  under this Agreement or a  material adverse effect on the financial
condition of the Partnership.
 
    (d)  SEC  DOCUMENTS.   The Partnership has  furnished and  will continue  to
furnish  the Company  with a  true and complete  copy of  each report, schedule,
registration statement and definitive proxy  statement filed by the  Partnership
with the Commission since January 1, 1994 (the "Partnership SEC Documents"). The
Partnership  SEC  Documents furnished  to the  Company  as of  the date  of this
Agreement are  all the  documents  (other than  preliminary material)  that  the
Partnership has been required to file with the Commission since such date. As of
their respective dates, the Partnership SEC Documents complied as to form in all
material  respects  with the  requirements  of the  Securities  Act of  1933, as
amended (the "Securities  Act"), and the  Exchange Act, as  applicable, and  the
applicable  rules and regulations of the  Commission thereunder, and none of the
Partnership SEC Documents contained any untrue  statement of a material fact  or
omitted  to state a material fact required  to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under  which
they were made, not misleading.
 
    (e)   FINANCIAL  STATEMENTS.   The financial  statements of  the Partnership
included  in  the   Partnership  SEC  Documents   (the  "Partnership   Financial
Statements")  complied, as of the date of the applicable document, as to form in
all material  respects with  applicable  accounting requirements  and  published
rules and regulations of the Commission with respect thereto, have been prepared
in  accordance with generally accepted accounting principles, applied on a basis
consistent with prior periods (except  as otherwise noted therein), and  present
fairly the financial position and results of operations of the Partnership as of
their  respective dates and  for the periods presented  therein (subject, in the
case of unaudited interim financial statements, to normal year-end adjustments).
 
    (f)   FULL  DISCLOSURE;  NO  MISSTATEMENTS.    The  representations  of  the
Partnership contained in this Agreement do not contain any untrue statement of a
material  fact  or  omit  to  state any  material  fact  necessary  to  make the
statements made herein not misleading, and  none of the information supplied  or
to  be  supplied by  the Partnership  for  inclusion in  the Offer  Documents or
registration statement on Form S-4 provided for in Section 5.9 hereof (the  "S-4
Registration  Statement")  or  the  Proxy  Statement/Prospectus  (as  defined in
Section 5.9 hereof) contains any untrue statement of a material fact or omits to
state any material fact required to be  stated therein or necessary in order  to
make  the statements therein, in light of the circumstances under which they are
made, not misleading. If at any time  prior to the termination of the Offer  or,
with    respect   to   the    S-4   Registration   Statement    or   the   Proxy
Statement/Prospectus, prior  to the  Closing  Date (as  defined in  Section  6.1
hereof),  any event relating to the Partnership should occur that is required to
be described  in an  amendment of  or  supplement to  the Offer  Documents,  S-4
Registration  Statement  or  the  Proxy  Statement/Prospectus,  the  Partnership
promptly shall inform the Company and assist in the preparation, filing and,  if
necessary, dissemination of such amendment or supplement.
 
    (g)   NO DEFAULTS.   The Partnership is  not in default  or violation of any
term, condition or  provision of  any agreement to  which the  Partnership is  a
party  or by which  it or any of  its Assets may be  bound that would materially
interfere with  the Partnership's  participation  in the  Merger or  that  would
result  in  a  material liability  not  reflected in  the  Partnership Financial
Statements.
 
                                      A-7
<PAGE>
    (h)  ABSENCE OF LITIGATION.  There is no suit, action or proceeding  pending
or,  to  the Partnership's  knowledge, threatened  against the  Partnership that
might materially  adversely affect  the Partnership's  ability to  perform  this
Agreement or to consummate the transactions contemplated hereby.
 
    (i)   NO MATERIAL  ADVERSE CHANGES.   Except as disclosed  in writing to the
Special Committee concurrently with the execution of this Agreement, there  have
been no material adverse changes in the business, operations, properties, assets
or  condition, financial or otherwise, of the Partnership from that set forth in
the Partnership's Annual  Report on Form  10-K for the  year ended December  31,
1995, as supplemented by the Partnership's Quarterly Report on Form 10-Q for the
quarter ended March 31, 1996, both as filed with the Commission.
 
    (j)   TITLE TO ASSETS.  The Partnership has good and marketable title to the
assets reflected in the most recent balance sheet (the "Balance Sheet") included
in the Partnership Financial Statements and reflected in its Net Asset Value and
will hold good and marketable title to  such assets, and any assets acquired  by
the  Partnership prior to the  Effective Time, except for  assets disposed of in
the ordinary  course  of  business (which  assets  do  not include  any  of  the
Property)  and except as  the failure of  the Partnership to  have such good and
marketable title is  not, in  the aggregate,  material to  the Partnership.  The
assets  reflected on the Balance Sheet include the Property. Except as otherwise
disclosed in the Balance Sheet or related notes accompanying it, all the  assets
referred  to in the preceding  sentence are owned free and  clear of any and all
material adverse claims,  security interests, charges  or other encumbrances  or
restrictions  of every nature,  except liens for  current taxes not  yet due and
payable or  landlords' liens  as provided  for  in the  relevant leases,  or  by
applicable law.
 
    (k)    LIABILITIES OF  THE  PARTNERSHIP.   The  Partnership has  no material
liabilities, contingent or otherwise, except  to the extent reflected,  reserved
against  or  provided for  in the  Balance  Sheet, and  except for  any material
liabilities disclosed in writing to the Special Committee concurrently with  the
execution  of this Agreement or any other obligations incurred after the date of
the Balance  Sheet  in  the  ordinary course  of  business,  which  subsequently
incurred  obligations are  of an  amount and  nature as  to be  capable of being
discharged from the operations of  the Partnership without requiring  additional
equity or borrowing.
 
    (l)  PROPERTY.
 
        (i)   Materially complete and correct legal descriptions of the Property
    have been delivered to the Company  concurrently with the execution of  this
    Agreement.
 
        (ii)   All information provided by the Partnership to the Appraiser with
    respect to the Property for use in preparing the appraisals of the  Property
    was true and correct in all material respects as of the date given.
 
        (iii)    Except  as  disclosed  in  writing  to  the  Special  Committee
    concurrently with the execution of this Agreement, to the best knowledge  of
    those  representatives and agents  of the Partnership  to whom notice should
    have been given, there is no material violation of any law, ordinance, rule,
    requirement, resolution, policy statement or regulation (including,  without
    limitation,  those relating to land use, subdivision, zoning, environmental,
    occupational health and safety, water, and  building and fire codes) of  any
    governmental authority (collectively, "Governmental Regulations") applicable
    to the construction, alteration, rehabilitation, maintenance, use, operation
    or  sale  of any  of the  Property,  which violation  would have  a material
    adverse effect  on the  use of  the Property.  The Partnership  has  neither
    received  notice nor has  knowledge that any  governmental authority, or any
    employee or agent thereof, considers the operations, use or ownership of any
    of the  Property  to violate  or  have violated  in  a material  manner  any
    Governmental Regulations, or that any investigation has been commenced or is
    contemplated regarding such possible violation.
 
        (iv)   To the best knowledge of  those representatives and agents of the
    Partnership to  whom notice  should  have been  given, the  Partnership  has
    neither  received  notice nor  has knowledge  of  any plan  or study  of any
    governmental authority that  would materially  adversely affect  the use  of
 
                                      A-8
<PAGE>
    the  Property for  its intended uses,  or result in  any public improvements
    that will  result  in any  material  charge  being levied  against,  or  any
    material lien assessed upon, all or any portion of such Property.
 
        (v)     Except  as  disclosed  in   writing  to  the  Special  Committee
    concurrently with the execution of this Agreement, to the best knowledge  of
    those  representatives and agents  of the Partnership  to whom notice should
    have been given, there are no delinquent taxes, assessments, charges, debts,
    liabilities, claims or  obligations arising from  the construction,  design,
    development,  ownership, maintenance or operation  of, or otherwise relating
    to, the  Property,  which matters  could  give  rise to  any  mechanics'  or
    materialmen's or other statutory or common-law lien against such Property or
    any  party  thereof that,  individually or  in the  aggregate, would  have a
    material adverse effect on the value of the Property, taken as a whole.
 
        (vi)    Except  as  disclosed  in  writing  to  the  Special   Committee
    concurrently  with the execution of this Agreement, to the best knowledge of
    those representatives and agents  of the Partnership  to whom notice  should
    have  been given or who, by virtue of his or her position, could be expected
    to have knowledge of any of the following matters, (A) none of the Property,
    which for  purposes of  this paragraph  shall include,  without  limitation,
    subsurface soil and ground water, contains any substance, including, without
    limitation, any asbestos, formaldehyde, radioactive substance, hydrocarbons,
    industrial  solvents, flammables, explosives and  any hazardous substance or
    toxic material (collectively, "Hazardous  Materials"), that could  presently
    or  at any time  in the future  cause a material  detriment to or materially
    impair the value or beneficial use of the Property or constitute or cause  a
    health,  safety or environmental hazard on or relating to the Property or to
    any person who  may enter onto  the Property or  require remediation at  the
    behest  of any  governmental agency,  which health,  safety or environmental
    hazard  or  remediation  could  have  a  material  adverse  effect  on   the
    Partnership;  (B) there are  no environmental conditions  relating to any of
    the Property  giving rise  to material  liability, and  the Property  is  in
    compliance  in all material respects with existing applicable federal, state
    and local environmental laws  and regulations; and  (C) the Partnership  has
    not  received notice that the ownership, operation, use and condition of any
    of the  Property  is  in violation  of  any  federal, state  or  local  law,
    ordinance   or  regulation  pertaining   to  industrial  hygiene,  Hazardous
    Materials  or  environmental  protection.  To  the  best  knowledge  of  the
    Partnership,  there is  no proceeding  or action  pending or,  to its actual
    knowledge, threatened by  any person  or governmental  agency regarding  the
    environmental condition of any of the Property.
 
        (vii)   The Partnership has not entered  into any contracts for the sale
    of all or any portion of the Property.
 
    (m)  TAXES.   The Partnership  has filed  all federal, state  and local  tax
returns  that it is required  to file, has provided  to its limited partners all
required Forms K-1 and such other tax forms as may be required by federal, state
or local authorities, and has no outstanding material liability for any federal,
state or local taxes or interest or penalties thereon, whether disputed or  not,
except  taxes  disputed  or not  yet  payable  that have  been  provided  for in
accordance with generally  accepted accounting principles  and are disclosed  in
the   Partnership  Financial  Statements;  the   Partnership  is  taxable  as  a
partnership (and not as an association taxable as a corporation) for federal and
applicable state income tax purposes.
 
    4.2  REPRESENTATIONS AND WARRANTIES OF THE COMPANY
 
    For the purposes  of inducing each  of the Partnerships  to enter into  this
Agreement  and to consummate the Merger,  the Company represents and warrants to
each Partnership as follows:
 
    (a)  ORGANIZATION;  POWER AND  AUTHORITY.   The Company  is duly  organized,
validly  existing and in good standing under  the laws of the state of Delaware.
The Company (i) has the authority to conduct its business as currently conducted
and to own and  operate the properties  that it now owns  and operates, (ii)  is
qualified  to do  business in all  jurisdictions in which  such qualification is
necessary, except where the failure to be so qualified would not have a material
adverse effect on the Company,
 
                                      A-9
<PAGE>
and (iii) has all requisite power, authority and legal right to enter into  this
Agreement  and  to consummate  the Merger.  The execution  and delivery  of this
Agreement by the Company and the consummation by the Company of the Merger  have
been  duly  authorized by  all necessary  corporate  action on  the part  of the
Company, and this  Agreement is  a legal, valid  and binding  obligation of  the
Company, enforceable against the Company in accordance with its terms.
 
    (b)  CONSENTS.  Except as expressly contemplated by this Agreement, no other
action  is required to be taken by the Company to permit the execution, delivery
and  performance  of  this  Agreement,  all  other  documents  and  certificates
expressly contemplated hereby, and the Merger, and no consent or approval of any
third  party  or governmental  authority is  or was  required or  appropriate in
connection  with  the  execution  of  this  Agreement,  or  to  consummate   the
transactions expressly contemplated hereunder, except such as have been obtained
or will be obtained prior to the Closing.
 
    (c)   NO VIOLATIONS.   The execution and delivery  of this Agreement do not,
and the consummation  of the Merger  and compliance with  the provisions  hereof
will  not, result in  any breach or  violation of any  (i) agreement (including,
without limitation,  the organizational  documents under  which the  Company  is
organized)  to  which the  Company is  a  party or  by which  it  or any  of its
properties  may  be   bound,  (ii)   permit,  license   or  other   governmental
authorization  applicable to the  Company or its  properties, or (iii) judgment,
order, law, rule or  regulation applicable to the  Company, other than any  such
items  that  in the  aggregate  do not  have a  material  adverse effect  on the
Company's ability to perform its obligations under this Agreement or a  material
adverse effect on the value of the Merger Consideration.
 
    (d)   CAPITALIZATION.  The authorized  capital stock of the Company consists
of (i) 120,000,000  REIT Shares, (ii)  500,000 shares of  Class B Common  Stock,
$.001  par value per share, (iii) 160,000,000  shares of Excess Stock, $.001 par
value per share, and (iv) 80,000,000 shares of Preferred Stock, $.001 par  value
per  share. All  outstanding REIT  Shares are  duly authorized,  validly issued,
fully paid and nonassessable, and  no class of capital  stock of the Company  is
entitled  to  preemptive or  cumulative  voting rights.  As  of March  31, 1996,
23,046,517 REIT Shares,  154,605 shares of  Class B Common  Stock, no shares  of
Excess Stock, and no shares of Preferred Stock were issued and outstanding.
 
    (e)  AUTHORIZATION OF REIT SHARES.  Prior to the Effective Time, the Company
will  have taken all necessary  action to permit it to  issue the number of REIT
Shares required to be  issued pursuant to Article  III hereof. Such REIT  Shares
will,  when  issued  pursuant to  this  Agreement, be  duly  authorized, validly
issued, fully paid  and nonassessable, and  no stockholder of  the Company  will
have  any preemptive right  of subscription or purchase  in respect thereof. The
REIT Shares will, when  issued pursuant to this  Agreement, be registered  under
the  Securities Act  and the  Exchange Act,  will be  registered or  exempt from
registration under all applicable state securities  laws and will be listed  for
quotation on the NYSE.
 
    (f)   SEC DOCUMENTS.  The Company has furnished and will continue to furnish
the Partnerships  with  a true  and  complete  copy of  each  report,  schedule,
registration  statement and definitive proxy statement filed by the Company with
the Commission since January 1, 1994 (the "Company SEC Documents"). The  Company
SEC Documents furnished to the Partnerships as of the date of this Agreement are
all  the documents (other  than preliminary material) that  the Company has been
required to file  with the Commission  since such date.  As of their  respective
dates,  the Company SEC Documents  complied as to form  in all material respects
with the requirements of the Securities Act and the Exchange Act, as applicable,
and the applicable rules and regulations of the Commission thereunder, and  none
of  the Company SEC Documents contained any  untrue statement of a material fact
or omitted to state a material fact  required to be stated therein or  necessary
in  order to make  the statements therein,  in light of  the circumstances under
which they were made, not misleading.
 
    (g)  FINANCIAL STATEMENTS.  The financial statements of the Company included
in the  Company  SEC  Documents complied,  as  of  the date  of  the  applicable
document,  as  to  form  in all  material  respects  with  applicable accounting
requirements and published rules and regulations of the Commission with  respect
thereto,  have been  prepared in  accordance with  generally accepted accounting
principles,
 
                                      A-10
<PAGE>
applied on a  basis consistent  with prior  periods (except  as otherwise  noted
therein), and present fairly the financial position and results of operations of
the  Company as of their respective dates  and for the periods presented therein
(subject, in  the case  of  unaudited interim  financial statements,  to  normal
year-end adjustments).
 
    (h)   FULL DISCLOSURE; NO MISSTATEMENTS.  The representations of the Company
contained in this Agreement  do not contain any  untrue statement of a  material
fact  or omit  to state a  material fact  necessary to make  the statements made
herein not misleading, and none of the information supplied or to be supplied by
the Company for inclusion or incorporation by reference in the S-4  Registration
Statement, the Offer Documents or the Proxy Statement/Prospectus relating to the
Company  contains any untrue statement of a  material fact or omits to state any
material fact required to be  stated therein or necessary  in order to make  the
statements therein, in light of the circumstances under which they are made, not
misleading.  If  at any  time prior  to the  termination of  the Offer  or, with
respect to the S-4 Registration Statement or the Proxy Statement/Prospectus, the
Closing Date, any event relating to the Company should occur that is required to
be described in  an amendment of  or supplement  to the Offer  Documents or  the
Proxy  Statement/Prospectus, the Company promptly  shall inform the Partnerships
and prepare, file and, if necessary, disseminate such amendment or supplement.
 
    (i)  ABSENCE OF LITIGATION.  There is no suit, action or proceeding  pending
or,  to  the  Company's knowledge,  threatened  against the  Company  that might
materially adversely affect the Company's  ability to perform this Agreement  or
to consummate the transactions contemplated hereby.
 
    (j)   NO  MATERIAL ADVERSE  CHANGES.   There have  been no  material adverse
changes in the business, operations, properties, assets or condition,  financial
or  otherwise, of the Company from that set forth in the Company's Annual Report
on Form  10-K for  the year  ended December  31, 1995,  as supplemented  by  the
Company's  Quarterly Report on Form  10-Q for the quarter  ended March 31, 1996,
both as filed with the Commission.
 
ARTICLE V.  COVENANTS AND AGREEMENTS
 
    During the period from the date  of this Agreement and continuing until  the
Closing  Date or the termination of this  Agreement, the Company and each of the
Partnerships agree to act in accordance with the following covenants:
 
    5.1  ORDINARY COURSE; NO ACQUISITIONS OR DISPOSITIONS
 
    Except as provided in  Section 5.2 hereof, each  Partnership shall carry  on
its  business  in  the  ordinary  course in  substantially  the  same  manner as
heretofore conducted and use all reasonable  efforts to (a) preserve intact  its
present  business, organization and goodwill, (b) maintain all permits, licenses
and  authorizations  required   by  applicable  laws,   and  (c)  preserve   its
relationships with customers, suppliers, lenders, lessors, governmental entities
and  others having business or regulatory dealings with it. No Partnership shall
acquire or agree to acquire by any manner any business or business  organization
or division thereof or otherwise acquire or agree to acquire any assets that are
material,  individually or  in the  aggregate, to  such Partnership,  other than
high-quality, short-term investments made in the ordinary course of business. No
Partnership shall sell, lease or otherwise  dispose of, or agree to sell,  lease
or  otherwise dispose of,  any of its  Assets, except in  the ordinary course of
business and consistent with past practice, and except as required by law.  Each
Partnership  shall promptly notify the Company of any event or occurrence not in
the ordinary course of business  or that may have  a material adverse effect  on
such Partnership's financial condition.
 
    5.2  DISTRIBUTIONS
 
    Each  Partnership  shall  use  its  best  efforts  to  manage  its business,
including, but not limited to, suspending cash distributions to its partners  if
the  General Partner deems it  advisable to do so,  such that such Partnership's
Closing Net  Asset Value  (as defined  in Section  5.2 hereof)  will equal  such
Partnership's   Net  Asset  Value.  Immediately   prior  to  the  Closing,  each
Partnership will declare a cash distribution  payable to those who are  partners
of    the    Partnership    at    such    time    in    an    aggregate   amount
 
                                      A-11
<PAGE>
equal to the amount, if any, by which such Partnership's Closing Net Asset Value
exceeds its Net  Asset Value. As  soon as reasonably  practicable following  the
Closing,  the  Company,  as the  Surviving  Corporation, will  take  all actions
necessary to transfer the amount necessary  to pay such distribution to  Gemisys
Corporation,  the  transfer  and  distribution agent  for  the  Partnership, for
distribution in accordance with the terms of the Partnership Agreement.
 
    As used herein, "Closing Net Asset Value" means, with respect to each of the
Partnerships, (i) the sum of  (a) the Appraised Value  (b) the cost incurred  to
the  Closing  Date of  buildouts and  unit  conversions, if  any, that  were not
reflected in the Appraised Value and (c) the book values of the non-real  estate
assets,  except for  amortizable assets,  of the  Partnership as  of the Closing
Date, less (ii) the sum of (x) such Partnership's liabilities as of the  Closing
Date, (y) the estimated cost remaining to be incurred, if any, as of the Closing
Date  to complete the buildouts  and unit conversions that  were included in the
Appraised Value, and (z) such Partnership's Individual Transaction Expenses  and
pro  rata share  of Shared  Transaction Expenses (as  such terms  are defined in
Section 8.3(a) hereof).
 
    5.3  AMENDMENT OF GOVERNING DOCUMENTS
 
    The IDS2 and  IDS3 Partnerships shall  take all actions  necessary to  amend
their  respective  Partnership Agreements  to  add the  following  subsection to
Section 13.3(c) of those  agreements, it being understood  that the approval  of
such  amendment by  limited partners will  be a  part of their  approval of this
Agreement and the transactions contemplated hereby:
 
       (iii) Notwithstanding any  provision of this  Agreement, the  Partnership
       may  merge with and  into Shurgard Storage  Centers, Inc. (the "Company")
       pursuant to, and consummate all  other transactions contemplated by,  the
       terms  of  the  Acquisition Agreement  dated  July 1,  1996,  between the
       Company, the  Partnership,  IDS/Shurgard  Income  Growth  Partners  L.P.,
       IDS/Shurgard  Income  Growth  Partners L.P.  II  and  IDS/Shurgard Income
       Growth Partners L.P. III.
 
    Except as provided above, no Partnership shall amend or propose to amend any
of  its  organizational   documents,  including  its   Certificate  of   Limited
Partnership  or Partnership Agreement, without the  prior written consent of the
Company.
 
    5.4  EXCLUSIVITY
 
    No Partnership will, nor will it permit its partners (including any  general
or  limited partner  of its  General Partner),  agents or  other representatives
(including, without limitation,  any investment banker,  attorney or  accountant
retained  by it) to, directly or  indirectly, initiate, solicit or encourage or,
except as  required  by law,  including  fiduciary  duties required  by  law  as
determined  by  the General  Partner  in good  faith,  engage in  discussions or
negotiations with or provide any information to any entity or group (other  than
the Company or an affiliate of the Company) concerning any acquisition proposal,
tender  offer,  exchange offer,  merger,  consolidation, sale  of  a substantial
amount of assets, or  sale of securities or  equity interests, or in  connection
with   a  liquidation,   dissolution  or  similar   transaction  involving  such
Partnership. Each Partnership will  notify the Company  immediately if any  such
inquiries  or proposals are received by, any such information is requested from,
or any such negotiations or discussions are sought to be initiated or  continued
with,  the Partnership,  and will  keep the Company  informed of  the status and
terms of any such proposals and any such negotiations or discussions.
 
    5.5  OTHER ACTIONS
 
    The Partnerships and the Company shall not  take or omit to take any  action
that  would  result  in  any  of  the  representations  and  warranties  of  the
Partnerships or the Company, respectively, made in or pursuant to this Agreement
becoming untrue or  incomplete, in any  of the covenants  and agreements of  the
Partnerships  or the  Company, respectively,  being breached,  or in  any of the
conditions to the Closing not being satisfied.
 
                                      A-12
<PAGE>
    5.6  ADVISE OF CHANGES
 
    Each Partnership  promptly shall  advise  the Company  in writing,  and  the
Company  promptly shall  advise the  Partnerships in  writing, of  any change or
event that  has  made,  or could  be  reasonably  expected to  make,  untrue  or
inaccurate  any representation or warranty made by  such party in or pursuant to
this Agreement or  that has  prevented or may  prevent the  performance by  such
party of any covenant or agreement made in or pursuant to this Agreement.
 
    5.7  MEETINGS OF LIMITED PARTNER
 
    Each   Partnership  will  take  all  action  necessary  in  accordance  with
applicable law and its Partnership Agreement to convene a meeting of its limited
partners as promptly as practicable to  consider and vote upon approval of  this
Agreement and the consummation of the Merger.
 
    5.8  REGISTRATION AND LISTING OF REIT SHARES
 
    The  Company will use its best efforts to register the REIT Shares under the
Securities Act and to cause the REIT Shares to be listed for trading on the NYSE
upon official notice of issuance.
 
    5.9  S-4 REGISTRATION STATEMENT AND PROXY STATEMENT/PROSPECTUS
 
    The Company and  the Partnerships will  promptly prepare and  file with  the
Commission  a preliminary proxy statement/prospectus in connection with the vote
of the limited partners  of the Partnerships on  the approval of this  Agreement
and  the  consummation  of  the  transactions  contemplated  hereby  (such proxy
statement/prospectus,  together  with  any  amendments  thereof  or  supplements
thereto,  in each case in the form or forms to be mailed to the limited partners
of the Partnerships, being called herein the "Proxy Statement/Prospectus").  The
Company  will, as promptly as practicable,  prepare and file with the Commission
the S-4 Registration  Statement, containing the  Proxy Statement/Prospectus,  in
connection  with the registration under the Securities Act of the REIT Shares to
be issued in the Merger.  The Company and the  Partnerships will each use  their
best  efforts to have  the S-4 Registration Statement  declared effective by the
Commission as  promptly as  practicable, and  also will  take any  other  action
required  to be taken  under federal or  state securities laws,  and each of the
Partnerships will use its best  efforts to cause the Proxy  Statement/Prospectus
to  be mailed to  the record and beneficial  owners of LP  Units at the earliest
practicable date.  The Company  agrees that  (a) if  at any  time prior  to  the
Effective  Time  any event  with respect  to  the Company  should occur  that is
required to be  described in  an amendment  of, or  a supplement  to, the  Proxy
Statement/  Prospectus or the S-4 Registration Statement, such event shall be so
described, and such  amendment or supplement  shall be promptly  filed with  the
Commission  and, as required by law, the Partnership will cause the amendment or
supplement to be disseminated  to the record and  beneficial owners of LP  Units
and  (b) the S-4 Registration Statement  and the Proxy Statement/Prospectus will
(with respect to the Company)  comply as to form  in all material respects  with
the requirements of the federal securities laws. Each of the Partnerships agrees
that  (i) if at any time  prior to the Effective Time  any event with respect to
the Partnership should occur  that is required to  be described in an  amendment
of,  or a supplement to, the  Proxy Statement/Prospectus or the S-4 Registration
Statement, such event shall  be so described, and  such amendment or  supplement
shall   be  promptly  filed  with  the  Commission  and,  as  required  by  law,
disseminated to the record and beneficial owners of LP Units and (ii) the  Proxy
Statement/Prospectus will (with respect to the Partnership) comply as to form in
all  material respects with the requirements of the federal securities laws. The
Proxy  Statement/Prospectus  shall  include   the  recommendation  and   consent
described in Section 2.1 of the General Partner Undertaking.
 
    5.10  CONSENTS AND APPROVALS
 
    The  Company and the  Partnerships shall each use  all reasonable efforts to
take, or cause to  be taken, all  actions and to  do, or cause  to be done,  all
other  things necessary, proper or advisable to consummate and make effective as
promptly as  practicable the  transactions contemplated  by this  Agreement,  to
obtain   in  a  timely  manner   all  necessary  consents,  waivers,  approvals,
authorizations and orders and to  make all necessary registrations and  filings,
and  otherwise to satisfy or  cause to be satisfied  all conditions precedent to
its obligations under this Agreement.
 
                                      A-13
<PAGE>
    5.11  LIMITATION ON NUMBER OF REIT SHARES ISSUED
 
    Notwithstanding any other provision of this Agreement, in the event that the
payment  of Merger Consideration in  the Merger would result  in the issuance by
the Company  of  more  than  20%  of  the  total  number  of  REIT  Shares  then
outstanding,  then the Company may elect to pay cash in lieu of such REIT Shares
in excess of 20% of the total  number of REIT Shares then outstanding (with  the
cash amount to be paid in lieu of such REIT Shares to be based on the REIT Share
Price),  and such cash  in lieu of  REIT Shares shall,  to the extent reasonably
practicable, be allocated  proportionately to all  partners in the  Partnerships
receiving Merger Consideration.
 
ARTICLE VI.  CLOSING
 
    6.1  CLOSING DATE
 
    The  consummation of  the transactions  contemplated hereby  (the "Closing")
shall be held within  five business days  of the satisfaction  or waiver of  the
conditions to closing set forth in Article VII hereof. The Closing shall be held
at  the  offices  of  Perkins  Coie, 1201  Third  Avenue,  40th  Floor, Seattle,
Washington, or at  such other  place as  may be agreed  upon in  writing by  the
Participating Partnerships and the Company. The date and hour of the Closing are
referred to as the "Closing Date." At the Closing each of the parties shall take
all  such action and  deliver all such  documents, instruments, certificates and
other items as may  be required under  this Agreement or  otherwise in order  to
perform  or fulfill all covenants,  conditions and agreements on  its part to be
performed or  fulfilled  on or  prior  to the  Closing  Date and  to  cause  all
conditions  precedent to the other parties'  obligations under this Agreement to
be satisfied in full.
 
    6.2  ADDITIONAL CLOSINGS
 
    Notwithstanding any other  provision of  this Agreement,  if the  conditions
precedent  to Closing  set forth  in Article VII  hereof have  been satisfied or
waived with  respect  to  the  Closing  of this  Agreement  as  to  one  or  two
Participating  Partnerships, this Agreement  may be closed  with respect to such
Participating Partnership(s)  and,  in the  event  the conditions  precedent  to
Closing  set forth  in Article VII  hereof are subsequently  satisfied or waived
with respect to  any additional  Participating Partnership(s), there  may be  an
additional   Closing   or   Closings   with   respect   to   such  Participating
Partnership(s). All references herein to the Closing and the Closing Date  shall
mean  the original Closing or such additional Closing(s), as applicable, and all
references herein to Effective Time shall mean the Effective Time of the  Merger
of  the  applicable  Participating  Partnership;  provided,  however,  that  the
determination of the amount of  Shared Transaction Expenses pursuant to  Section
8.3  hereof shall be made prior to the  initial Closing and shall not be further
adjusted at any subsequent Closing.
 
    6.3  FURTHER ACTS
 
    If at any  time after  the Closing  Date any further  action by  any of  the
parties to this Agreement is necessary or desirable to carry out the purposes of
this Agreement and/or to vest in the Company full title to all Assets and rights
of  the Participating Partnerships, such party  shall take all such necessary or
desirable action or use its best efforts to cause such action to be taken.
 
ARTICLE VII.  CONDITIONS
 
    The respective obligations of  the parties hereto  to consummate the  Merger
pursuant  to the  terms of  this Agreement  are subject  to satisfaction  of the
following conditions precedent  on or prior  to the Closing  Date. In the  event
that  one or  more of  these conditions  are not  satisfied on  or prior  to the
Closing Date, the party  or parties whose obligations  hereunder are subject  to
the  satisfaction of such condition or  conditions may either elect to terminate
this Agreement or waive the satisfaction of such condition. The consummation  of
the Merger as to any Partnership is not conditioned upon the consummation of the
Merger as to any other Partnership.
 
    7.1  CONDITIONS TO EACH PARTY'S OBLIGATIONS
 
    The  respective  obligations of  each party  to  consummate the  Mergers are
subject to the  fulfillment on or  prior to  the Closing Date  of the  following
conditions:
 
                                      A-14
<PAGE>
    (a)   APPROVAL OF LIMITED PARTNERS.   This Agreement and the consummation of
the Merger shall have been  duly approved by the  requisite vote of the  limited
partners  of the Partnership in accordance with the applicable provisions of its
Partnership Agreement and the WULPA.
 
    (b)  ABSENCE OF  INJUNCTIONS.  No injunctions  relating to the  transactions
contemplated  by this Agreement or  any of the parties  hereto that would have a
material adverse effect on  the Company or  on the business  or Property of  the
Partnerships,   taken  as  a  whole  or  individually,  or  that  would  prevent
consummation of the Merger, shall have been issued and remain outstanding.
 
    (c)   EFFECTIVENESS OF  S-4 REGISTRATION  STATEMENT.   The S-4  Registration
Statement  shall  have  been  declared effective  by  the  Commission  under the
Securities  Act.  No  stop  order  suspending  the  effectiveness  of  the   S-4
Registration  Statement  shall  have  been  issued  by  the  Commission  and  no
proceeding for that purpose  and no similar proceeding  in respect of the  Proxy
Statement/Prospectus shall have been initiated or threatened by the Commission.
 
    (d)   LISTING OF REIT SHARES.  The  REIT Shares issuable in the Merger shall
have been authorized for listing on the NYSE upon official notice of issuance.
 
    7.2  CONDITIONS TO THE OBLIGATIONS OF THE COMPANY
 
    The  obligation  of  the  Company  to  consummate  the  Merger  as  to  each
Partnership  shall be subject to the fulfillment on or prior to the Closing Date
of the following conditions, unless waived in writing by the Company:
 
    (a)  FAIRNESS  OPINION.   The Company shall  have received  an opinion  from
Alex.  Brown  & Sons  Incorporated as  to the  fairness to  the Company,  from a
financial point of view, of the Offer Prices and the Merger Consideration.
 
    (b)  CLOSING NET ASSET VALUE.  The Company shall have received a certificate
from the General Partner dated the Closing Date certifying that the Closing  Net
Asset  Value of  each Partnership  is no less  than its  Net Asset  Value of the
Partnership.
 
    (c)  ABSENCE OF ADVERSE  CHANGE.  Subsequent to  the date hereof, there  has
not  been any material adverse change in the Partnership's ability to consummate
the Merger, or in the Partnership's business, operations, properties, assets  or
condition, financial or otherwise.
 
    (d)  REPRESENTATIONS AND WARRANTIES TRUE AS OF BOTH PRESENT DATE AND CLOSING
DATE.   The representations  and warranties of  the Partnership contained herein
shall be true in all material respects as  of the date of this Agreement and  on
the Closing Date.
 
    (e)   COMPLIANCE  WITH COVENANTS.   The Partnership shall  have performed or
complied with in all material respects all obligations, agreements and covenants
contained in this Agreement to be performed and complied with by it on or  prior
to the Closing Date.
 
    (f)   THIRD-PARTY CONSENTS.  All necessary consents and approvals from third
parties to the transfers,  conveyances and transactions  set forth herein  shall
have been obtained.
 
    (g)   OPINION.  The  Company shall have received  an opinion from counsel to
the Partnership in the form attached hereto as Exhibit B.
 
    (h)  ACCOUNTANT'S LETTER.   The Special Committee  shall have received  from
Deloitte  &  Touche LLP  a letter,  in  form and  substance satisfactory  to the
Special Committee, acting in good faith, applying certain agreed-upon procedures
to designated information contained  in the S-4  Registration Statement and  the
Offer Documents.
 
    7.3  CONDITIONS TO THE OBLIGATIONS OF THE PARTNERSHIPS
 
    The  obligation  of each  of the  Partnerships to  consummate the  Merger is
subject to the  fulfillment on or  prior to  the Closing Date  of the  following
conditions, unless waived in writing by the applicable Partnership:
 
                                      A-15
<PAGE>
    (a)   FAIRNESS OPINION.   The Partnership shall  have received opinions from
Robert A. Stanger & Co., Inc. as to the fairness to the limited partners of  the
Partnership,  from a financial point of view,  of the Offer Price and the Merger
Consideration.
 
    (b)  ABSENCE OF ADVERSE  CHANGE.  Subsequent to  the date hereof, there  has
not  been any material adverse change in the Company's ability to pay the Merger
Consideration, or in the Company's  business, operations, properties, assets  or
condition, financial or otherwise.
 
    (c)  REPRESENTATIONS AND WARRANTIES TRUE AS OF BOTH PRESENT DATE AND CLOSING
DATE.   The representations and warranties of the Company contained herein shall
be true in all  material respects as of  the date of this  Agreement and on  the
Closing Date.
 
    (d)    COMPLIANCE  WITH COVENANTS.    The  Company shall  have  performed or
complied with in all material respects all obligations, agreements and covenants
contained in this Agreement to be performed and complied with by it on or  prior
to the Closing Date.
 
    (e)   THIRD-PARTY CONSENTS.  All necessary consents and approvals from third
parties to the transfers,  conveyances and transactions  set forth herein  shall
have been obtained.
 
    (f)   OPINION.  The Partnership shall  have received an opinion from special
counsel to the Company in the form attached hereto as Exhibit C.
 
ARTICLE VIII.  TERMINATION AND WAIVER
 
    8.1  TERMINATION
 
    With respect to  any Partnership, this  Agreement may be  terminated at  any
time  prior  to  the Effective  Time,  notwithstanding approval  thereof  by the
limited partners of such Partnership:
 
    (a) by  mutual consent  duly authorized  by the  Board of  Directors of  the
Company and the General Partner of the Partnership; or
 
    (b)  by either  the Company or  the Partnership  if the Merger  has not been
consummated by March 31, 1997, or such later date as mutually agreed upon by the
parties; provided, however,  that the  right to terminate  this Agreement  under
this Section 8.1(b) shall not be available to any party whose failure to fulfill
any  obligation under this  Agreement has been  the cause of  or resulted in the
failure of such Merger to occur on or before such date; or
 
    (c) by  either  the Company  or  the Partnership  if  a court  of  competent
jurisdiction  or governmental, regulatory or administrative agency or commission
shall have issued  a nonappealable final  order, decree or  ruling or taken  any
other  action  having  the  effect  of  permanently  restraining,  enjoining  or
otherwise prohibiting  the  Merger  between the  Company  and  the  Partnership;
provided, however, that the right to terminate this Agreement under this Section
8.1(c)  shall  not be  available  to any  party who  has  not complied  with its
obligations under Sections 5.9 and 5.10 hereof and such noncompliance materially
contributed to the issuance of any such order, decree or ruling or the taking of
such action; or
 
    (d) by either the Company  or the Partnership if  the requisite vote of  the
limited  partners of the Partnership  shall not have been  obtained by March 31,
1997; or
 
    (e) by  the Company  if (i)  the General  Partner of  the Partnership  shall
withdraw  or  change  its approval  of  this  Agreement or  the  General Partner
Recommendation in a manner determined by the Company in good faith to be adverse
to the Company or shall have resolved to  do so; or (ii) the General Partner  of
the  Partnership,  shall  have  recommended  to  the  limited  partners  of  the
Partnership an Alternative Transaction (as defined in Section 8.3(c) hereof); or
(iii) any person (other than the Company  or an affiliate of the Company)  shall
have acquired voting rights to, or the right to acquire voting rights to, or any
"group"  (as such term is  defined in Section 14(d) of  the Exchange Act and the
rules and regulations promulgated thereunder)  shall have been formed which  has
voting rights to, or
 
                                      A-16
<PAGE>
the  right to acquire voting  rights to, 20% or  more of the then-outstanding LP
Units of such Partnership; or (iv) if the REIT Share Price, without taking  into
account the application of the REIT Share Price Range, exceeds $28.50; or
 
    (f)  by the Company or the Partnership if (i) any representation or warranty
of the Partnership  or the Company,  respectively, set forth  in this  Agreement
shall  be materially untrue when made or  shall become materially untrue or (ii)
upon a breach of any covenant or agreement on the part of the Partnership or the
Company, respectively, set forth in this Agreement, such that the conditions set
forth in Section  7.2(e) or  7.3(d) hereof,  as the case  may be,  would not  be
satisfied  (either (i)  or (ii) above  being a  "Terminating Breach"); provided,
however, that if such Terminating Breach is  curable prior to March 31, 1997  by
the  Company or the Partnership, as the case may be, through the exercise of its
reasonable best efforts and for  so long as the  Company or the Partnership,  as
the case may be, continues to exercise such reasonable best efforts, neither the
Partnership  nor the Company,  respectively, may terminate  this Agreement under
this Section 8.1(f); or
 
    (g) by  the Partnership  or the  Company if  the Partnership  enters into  a
definitive agreement accepting an Alternative Transaction; or
 
    (h)  by the Partnership if the REIT Share Price, without taking into account
the application  of the  REIT Share  Price Range,  is less  the $21.50  and  the
Company  has not agreed  to pay the Additional  Consideration in accordance with
Section 2.2 of the General Partner Undertaking.
 
    The right of any party hereto  to terminate this Agreement pursuant to  this
Section  8.1 shall remain operative  and in full force  and effect regardless of
any investigation  made  by  or  on  behalf of  any  party  hereto,  any  person
controlling  any  such party  or any  of  their respective  officers, directors,
partners or  stockholders, whether  prior  to or  after  the execution  of  this
Agreement.
 
    8.2  EFFECT OF TERMINATION
 
    In  the event of  termination of this  Agreement as provided  in Section 8.1
hereof, this Agreement  shall become  void and there  shall be  no liability  or
obligation  on  the  part of  any  party  hereto or  its  respective affiliates,
partners, officers, directors or stockholders  except (a) for the provisions  of
Section  1.3(d) (if, and only if, an  Offer has been consummated and the Company
has been  admitted as  a  limited partner  of  the applicable  Partnership  with
respect  to the LP Units  purchased in the Offer)  and Section 8.3 hereof, which
provisions shall  survive the  termination of  this Agreement,  and (b)  to  the
extent  that such termination results from the  willful breach of a party hereto
of any of its  representations, warranties, covenants or  agreements made in  or
pursuant to this Agreement.
 
    8.3  FEES AND EXPENSES
 
    (a)  The  costs and  expenses that  have been  and will  be incurred  by the
Partnerships and the Company in connection with the preparation and  negotiation
of this Agreement, the making of the Offers and the solicitation of the approval
of  the limited partners of each of the Partnerships to the Merger, except those
costs and expenses identified below as "Individual Transaction Expenses" will be
shared by the Partnerships and the Company (the "Shared Transaction  Expenses").
The Shared Transaction Expenses include, without limitation, accounting fees and
expenses,  filing, printing  and mailing costs  of the Offer  Documents, the S-4
Registration Statement,  the  Proxy Statement/Prospectus  and  other  soliciting
materials, proxy solicitation fees, depositary fees and closing costs. Except as
otherwise  provided in this Section 8.3, the Shared Transaction Expenses will be
shared by the Company  and the Partnerships  as follows: (a)  50% of the  Shared
Transaction  Expenses will  be borne by  the Company  and (b) 50%  of the Shared
Transaction Expenses  will be  borne by  the Partnerships,  with the  amount  of
Shared  Transaction Expenses to be borne by  the Partnerships to be allocated to
each Partnership pro  rata based on  its relative Net  Asset Value.  "Individual
Transaction  Expenses" consist  of (i)  legal fees  and expenses;  (ii) fees and
expenses of investment bankers and other  financial advisors; (iii) the cost  of
the  Partnerships' real estate  portfolio appraisals and  (iv) the transfer fees
payable by the Company for the LP Units acquired through the Offers.  Individual
Transaction
 
                                      A-17
<PAGE>
Expenses  that  are  incurred by  the  Company  will be  borne  by  the Company.
Individual Transaction Expenses that  are incurred by  the Partnerships will  be
allocated  to each Partnership pro rata based on the relative Net Asset Value of
each Partnership.
 
    The Partnerships and  the Company  agree to  contribute their  share of  the
Shared  Transaction  Expenses  to  the  party  that  has  incurred  such  Shared
Transaction Expenses as they  are incurred if requested  by the Other Party.  In
the  event that the  amount of such  Shared Transaction Expenses  is not finally
determined prior to the Closing, the  parties hereto will agree on a  reasonable
estimate  of  the final  amount of  such Shared  Transaction Expenses,  and such
estimated amount, together with the amount of expenses already incurred, will be
the total Shared  Transaction Expenses.  The Company shall  pay to  each of  the
Partnerships,  or each  of the  Partnerships shall pay  to the  Company or shall
accrue to the extent not already accrued as of the Closing Date, as the case may
be, its allocated portion of Shared  Transaction Expenses that have not  already
been  paid, in full satisfaction  of its obligations under  this Section 8.3. No
adjustments will be made following the Closing if the total amount of the Shared
Transaction Expenses estimated  by the parties  hereto prior to  the Closing  is
different from the amount actually incurred.
 
    (b)  Except for IDS1,  as to whom  this Section 8.3(b)  is not applicable, a
Partnership  shall  pay  the  Company  a   pro  rata  portion  (based  on   such
Partnership's   relative  Net  Asset  Value,   taking  into  account  all  three
Partnerships) of  the Shared  Transaction  Expenses and  Individual  Transaction
Expenses that would otherwise be borne by the Company pursuant to Section 8.3(a)
hereof, upon the first to occur of any of the following events:
 
        (i)  the termination of this Agreement by the Company or the Partnership
    pursuant to Section 8.1(d)  hereof or the termination  of this Agreement  by
    the  Company pursuant to Section 8.1(f) hereof and, in either such case, the
    Partnership has furnished  information to,  or entered  into discussions  or
    negotiations  with,  any person  or entity  with  respect to  an Alternative
    Transaction and  the  General Partner  Recommendation  shall not  have  been
    reaffirmed  to the limited  partners of the  Partnership by the  date of the
    meeting of limited partners and remain effective on that date; or
 
        (ii) the  termination  of this  Agreement  by the  Company  pursuant  to
    Section 8.1(e)(i), (ii), or (iii) hereof; or
 
        (iii)  the  termination  of this  Agreement  by the  Partnership  or the
    Company pursuant to Section 8.1(g) hereof.
 
    (c) "Alternative Transaction"  means any (i)  transaction pursuant to  which
any  person or group of  persons other than the Company  or any affiliate of the
Company (a  "Third  Party") acquires  or  would acquire  more  than 25%  of  the
outstanding  LP  Units  of  the Partnership,  whether  from  the  Partnership or
pursuant to a tender offer or exchange offer or otherwise, (ii) merger or  other
business combination involving the Partnership pursuant to which any Third Party
acquires  more  than 25%  of  the LP  Units or  other  equity securities  of the
Partnership or  the entity  surviving such  merger or  business combination,  or
(iii)  any other transaction pursuant to which any Third Party acquires or would
acquire control of the assets of the Partnership having a fair market value  (as
determined  by the General  Partner of the  Partnership in good  faith) equal to
more than 25%  of the fair  market value of  all the assets  of the  Partnership
immediately prior to such transaction.
 
    (d)  In the event of the termination of this Agreement by the Company or the
Partnership pursuant  to Section  8.1(d) hereof  following the  vote of  limited
partners  of the Partnership and if  Section 8.3(b)(i) hereof is not applicable,
then the Partnership shall bear a percentage of the Shared Merger Expenses  that
the  Partnership would  otherwise have borne  pursuant to  Section 8.3(a) hereof
equal to the  percentage of outstanding  LP Units of  the Partnership that  were
voted  in  favor  of  the Merger.  Any  Shared  Merger Expenses  not  paid  by a
Partnership pursuant to  this paragraph shall  be paid by  the Company (and  not
paid by the other Partnerships).
 
                                      A-18
<PAGE>
    8.4  EXTENSION; WAIVER
 
    At  any time  prior to the  Closing, the  parties hereto may,  to the extent
legally allowed,  (a)  extend  the  time  for the  performance  of  any  of  the
obligations   or  other  acts  of  the  other  parties  hereto,  (b)  waive  any
inaccuracies in the representations and  warranties of the other parties  hereto
contained  herein or made in connection  herewith, and (c) waive compliance with
any of  the  agreements  of  the other  parties  hereto  contained  herein.  Any
agreement on the part of a party hereto to any such extension or waiver shall be
valid  only if set  forth in an instrument  in writing signed  on behalf of such
party.
 
    8.5  NO SURVIVAL OF REPRESENTATIONS AND WARRANTIES
 
    None of the representations and  warranties in this Agreement shall  survive
the Closing Date.
 
ARTICLE IX.  MISCELLANEOUS
 
    9.1  ASSIGNMENT OF CONTRACT
 
    The  Company  may not  assign its  rights under  this Agreement  without the
consent of the applicable Partnership. None of the Partnerships may assign their
rights under this Agreement.
 
    9.2  RISK OF LOSS
 
    (a) Risk of loss or damage to the Assets by condemnation, eminent domain  or
similar proceedings (or deed in lieu thereof), or by fire or any other casualty,
from  the date  hereof through  the Effective  Time will  be on  the Partnership
owning such Assets and thereafter will be on the Company.
 
    (b) In the event of  loss or damage to the  Assets that occurs prior to  the
Effective Time, if the Partnership elects not to or is unable to effect a timely
cure of such loss or damage prior to Closing, the monetary value of such loss or
damage  shall  be reflected  on  the Closing  Balance Sheet  and  if, as  of the
Effective Time,  the reduction  in  the Partnership's  Closing Net  Asset  Value
resulting  from such loss or damage is not offset by an increase in other Assets
of the Partnership (including  insurance proceeds payable  with respect to  such
loss  or  damage or  condemnation awards  received) to  the extent  necessary to
satisfy the condition to Closing set forth in Section 7.2(b) hereof, the Company
may, at its option, elect to terminate this Agreement as to such Partnership, or
the Company may elect  to extend the  term of this  Agreement and resolicit  the
limited partners of such Partnership with respect to participation in the Merger
with  the  Net Asset  Value of  the  Partnership suffering  such loss  or damage
adjusted to reflect such loss or damage.
 
    9.3  ENTIRE AGREEMENT; MODIFICATIONS
 
    This Agreement, together with the General Partner Undertaking, embodies  and
constitutes  the entire  understanding between the  parties with  respect to the
transactions contemplated herein, and  all prior or contemporaneous  agreements,
understandings, representations and statements, oral or written, are merged into
this  Agreement. Neither this Agreement, the General Partner Undertaking nor any
provision hereof  or thereof  may be  waived, modified,  amended, discharged  or
terminated  except by an instrument in writing signed by the party against which
the  enforcement  of   such  waiver,  modification,   amendment,  discharge   or
termination is sought, and then only to the extent set forth in such instrument.
 
    9.4  NOTICES
 
    All  notices, demands  or other  writings in  this Agreement  provided to be
given or made or sent, or  which may be given or  made or sent, by either  party
hereto  to the other may  be given personally or  may be delivered by depositing
the same in the U.S. mail, certified, return receipt requested, postage  prepaid
or  by delivering the same to an  air courier service, postage prepaid, properly
addressed and sent  to the address  of such party  as set forth  below, or  such
other address as either party may from
 
                                      A-19
<PAGE>
time  to time  designate by written  notice to  the other. Notice  given by mail
shall be considered effective  upon the expiration of  five business days  after
deposit.  Notice given in any  other manner shall be  effective only if and when
received by the addressee.
 
<TABLE>
<S>                                             <C>
To the Company:                                 Shurgard Storage Centers, Inc.
                                                Attn: Harrell Beck
                                                1201 Third Avenue, Suite 2200
                                                Seattle, Washington 98101
 
with a copy to:                                 Latham & Watkins
                                                Attn: Scott R. Haber
                                                505 Montgomery Street, 19th Floor
                                                San Francisco, California 94111
 
To the Partnerships:                            Shurgard Associates L.P.
                                                Shurgard Associates L.P. II
                                                Shurgard Associates L.P. III
                                                Attn: Charles K. Barbo
                                                1201 Third Avenue, Suite 2200
                                                Seattle, Washington 98101
 
with a copy to:                                 Perkins Coie
                                                Attn: Linda A. Schoemaker
                                                1201 Third Avenue, 40th Floor
                                                Seattle, Washington 98101-3099
</TABLE>
 
    9.5  INTERPRETATION
 
    Words of any gender used  in this Agreement shall  be held and construed  to
include  any  other gender,  and words  of a  singular number  shall be  held to
include the plural and vice versa, unless the context requires otherwise.
 
    9.6  CAPTIONS
 
    The captions used in this Agreement  are for convenience only and shall  not
be deemed to construe or to limit the meaning of the language of this Agreement.
 
    9.7  MULTIPLE COUNTERPARTS
 
    This  Agreement may be executed in  any number of identical counterparts. If
so executed, each  of such  counterparts is  to be  deemed an  original for  all
purposes, and all such counterparts shall collectively constitute one agreement,
but  in making proof of  this Agreement it shall not  be necessary to produce or
account for more than one such counterpart.
 
    9.8  BINDING EFFECT
 
    Subject to the restrictions on  assignment contained in Section 9.1  hereof,
this  Agreement shall be  binding upon and  inure to the  benefit of the parties
hereto  and  their  respective  heirs,  legal  representatives,  successors  and
assigns.
 
    9.9  ATTORNEYS' FEES
 
    Subject  to the requirements of Section 9.11 hereof, should any party hereto
employ an attorney or attorneys  to enforce any of  the provisions hereof or  to
protect  its interest in any manner arising  under this Agreement, or to recover
damages for the breach hereof, the nonprevailing party or parties in any  action
pursued in courts of competent jurisdiction (the finality of which action is not
legally  contested)  agrees  to  pay  to the  prevailing  party  or  parties all
reasonable costs, damages and expenses,  including attorneys' fees, expended  or
incurred  in connection therewith; provided, however, that if more than one item
is disputed and the final  decision is against each party  as to one or more  of
the  disputed  items, then  such costs,  expenses and  attorneys' fees  shall be
apportioned in accordance with the monetary values of the items decided  against
each party.
 
                                      A-20
<PAGE>
    9.10  NO WAIVER; SEVERABILITY
 
    The failure of any party hereto to enforce at any time any of the provisions
of  this Agreement  shall in  no way  be construed  to be  a waiver  of any such
provision, and shall in no way affect the validity of this Agreement or any part
hereof or the  right of  any party  thereafter to  enforce each  and every  such
provision.  No waiver  of any  breach of this  Agreement shall  be held  to be a
waiver of any other or subsequent breach. If any provision of this Agreement, or
the application thereof to any person or circumstances shall, for any reason and
to any extent, be invalid or unenforceable, but the extent of the invalidity  or
unenforceability  does not destroy the basis  of the bargain between the parties
as contained herein, the remainder of this Agreement and the application of such
provision to other persons  or circumstances shall not  be affected thereby  but
rather shall be enforced to the greatest extent permitted by law.
 
    9.11  NO JOINT AND SEVERAL LIABILITY
 
    If  one of the Partnerships  defaults under, or is in  breach of, any of its
representations, warranties  or  covenants  contained in  this  Agreement,  such
Partnership  shall be  accountable to  the Company and  shall be  liable for the
damages caused by  such default or  breach as provided  in this Agreement.  Each
Partnership  hereunder  has  undertaken  obligations  and  made representations,
warranties, disclosures and covenants herein and in and pursuant to the exhibits
hereto solely  with respect  to itself  and the  Property owned  by it.  Nothing
contained  herein, however, is intended to  make any of the Partnerships jointly
and severally liable for the default or breach by any of the other Partnerships,
and with  respect to  any  such default  and breach  such  shall be  solely  the
obligation  and responsibility of the Partnership responsible for the default or
breach.
 
    9.12  APPLICABLE LAW
 
    This Agreement shall  be governed by  and construed in  accordance with  the
laws of the state of Washington.
 
                                      A-21
<PAGE>
    IN  WITNESS WHEREOF, this Agreement has been executed by each of the parties
as of the date first set forth above.
 
                                          COMPANY:
 
                                          SHURGARD STORAGE CENTERS, INC.
 
                                          By /s/_HARRELL BECK___________________
                                             Harrell Beck, Chief Financial
                                             Officer
 
                                          PARTNERSHIPS:
 
                                          IDS/SHURGARD INCOME GROWTH PARTNERS
                                          L.P.
 
                                          By Shurgard Associates L.P.
                                          Its General Partner
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo,
                                             General Partner
 
                                            /s/_ARTHUR W. BUERK_________________
                                            Arthur W. Buerk,
                                          General Partner
 
                                          Shurgard General Partner, Inc.
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo, President
 
                                      A-22
<PAGE>
                                          IDS/SHURGARD INCOME GROWTH PARTNERS
                                          L.P. II
 
                                          By Shurgard Associates L.P. II
                                          Its General Partner
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo,
                                             General Partner
 
                                            /s/_ARTHUR W. BUERK_________________
                                            Arthur W. Buerk,
                                            General Partner
 
                                          Shurgard General Partner, Inc.
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo, President
 
                                          IDS/SHURGARD INCOME GROWTH PARTNERS
                                          L.P. III
 
                                          By Shurgard Associates L.P. III
                                          Its General Partner
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo,
                                             General Partner
 
                                            /s/_ARTHUR W. BUERK_________________
                                            Arthur W. Buerk,
                                            General Partner
 
                                          Shurgard General Partner, Inc.
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo, President
 
                                      A-23
<PAGE>
                       EXHIBIT A TO ACQUISITION AGREEMENT
                          GENERAL PARTNER UNDERTAKING
 
    This GENERAL PARTNER UNDERTAKING  (this "Agreement") is  entered into as  of
July  1,  1996  by Shurgard  Associates  L.P.  ("GP1"), the  general  partner of
IDS/Shurgard Income Growth Partners L.P.  ("IDS1"), Shurgard Associates L.P.  II
("GP2"),  the general  partner of  IDS/Shurgard Income  Growth Partners  L.P. II
("IDS2"), and  Shurgard Associates  L.P.  III ("GP3"),  the general  partner  of
IDS/Shurgard  Income  Growth Partners  L.P. III  ("IDS3"), and  Shurgard Storage
Centers, Inc., a  Delaware corporation  (the "Company").  GP1, GP2  and GP3  are
individually  referred to herein as a  "General Partner" and collectively as the
"General Partners." IDS1, IDS2 and IDS3 are individually referred to herein as a
"Partnership" and collectively as the "Partnerships."
 
                                    RECITALS
 
    A.  Concurrently with the execution of this Agreement, the Partnerships  and
the Company are entering into an Acquisition Agreement, dated as of July 1, 1996
(the "Acquisition Agreement"), pursuant to which (i) the Company will commence a
tender offer to purchase up to a specified percentage of the limited partnership
units  of each of the Partnerships (each,  an "Offer" and together the "Offers")
and (ii)  the  Partnerships  will merge  with  and  into the  Company  upon  the
satisfaction  or waiver of the conditions  to closing contained therein (each, a
"Merger" and together, the "Mergers").
 
    B.  The General  Partners believe that  it is in the  best interests of  the
Partnerships  and their limited partners for  the Partnerships to enter into and
consummate  the  Acquisition  Agreement  and  the  General  Partners  intend  to
recommend  to  the  limited partners  of  the  Partnerships that  they  vote for
approval of the Acquisition Agreement.
 
    C.   Capitalized terms  used but  not  defined in  this Agreement  have  the
meanings assigned to such terms in the Acquisition Agreement.
 
                                   AGREEMENTS
 
    NOW,  THEREFORE, in consideration of the mutual representations, warranties,
covenants and agreements set forth herein, the parties hereto agree as follows:
 
ARTICLE I.  THE OFFERS
 
    1.1  CONSENT TO OFFERS
 
    The General Partners hereby consent to the making of the Offers.
 
    1.2  GENERAL PARTNER FAIRNESS DETERMINATION AND RECOMMENDATION
 
    With respect to each Offer, the  Offer Documents and the Schedules 14D-9  or
the  Schedules 13E-3 shall contain, to  the extent applicable, (a) the statement
by the General Partner that the terms of  the Offers and the Merger are fair  to
limited  partners and (b) the recommendation by the General Partner that holders
of LP Units who desire immediate liquidity tender their LP Units pursuant to the
Offer and  that  all  other holders  of  LP  Units retain  their  LP  Units  and
participate in the Merger.
 
    1.3  ADMISSION OF COMPANY AS SUBSTITUTE LIMITED PARTNER
 
    Each  of the General  Partners agrees to  take such actions  as are required
under the  applicable  Partnership Agreement  to  effect the  admission  of  the
Company  as a limited  partner of the  Partnership with respect  to all LP Units
acquired by  it pursuant  to  the Offer  in accordance  with  the terms  of  the
Partnership Agreement.
 
ARTICLE II.  THE MERGERS
 
    2.1  MEETINGS OF LIMITED PARTNERS; RECOMMENDATION OF GENERAL PARTNERS
 
    Each  General  Partner will  take all  action  necessary in  accordance with
applicable law and its Partnership's Partnership Agreement to convene a  meeting
of its limited partners as promptly as
 
                                     A(A-1)
<PAGE>
practicable  to consider and vote upon approval of the Acquisition Agreement and
consummation of the transactions contemplated thereby. Except as may be required
for the discharge of their fiduciary duties or as otherwise required by law, (a)
the General Partner shall recommend that  the limited partners vote in favor  of
approval  of  the Acquisition  Agreement  and consummation  of  the transactions
contemplated thereby and shall solicit the vote of the limited partners of  such
Partnership  in favor of  such approval and  take all other  action necessary or
advisable to secure the vote of such limited partners in favor of such  approval
and  (b)  IDS  Partnership Services  Corporation  ("IPSC") will  consent  to the
transactions contemplated by the Acquisition Agreement.
 
    2.2  WITHDRAWAL OF RECOMMENDATION IF REIT SHARE PRICE IS LESS THAN $21.50
 
    It is understood that the General  Partner of each Partnership may elect  to
withdraw  or change  its recommendation that  limited partners vote  in favor of
this Agreement if  the REIT Share  Price calculated without  regard to the  REIT
Share  Price Range in  respect of the  meeting (the "Meeting")  at which limited
partners are expected to vote on the Merger is less than $21.50. Before it  does
so,  however, the  General Partner  shall notify  the Company  of its  intent to
withdraw its recommendation not  later than the end  of the second business  day
following  the day the REIT  Share Price is determined,  and the General Partner
shall postpone or adjourn the meeting for such period or periods of time, not to
exceed ten business  days, as the  Company may reasonably  request. The  General
Partner  shall not withdraw its recommendation if  the Company agrees to pay the
Additional Consideration at least  two business days prior  to the date of  such
postponed or adjourned meeting.
 
ARTICLE III.  OTHER AGREEMENTS
 
    3.1  STANDSTILL
 
    The Company agrees that if it is admitted as a substitute limited partner in
a  Partnership and except  as otherwise contemplated by  this Agreement, it will
not, directly or indirectly, without the prior written consent of a majority  of
the  general partners of the General Partner of that Partnership (a) acquire any
additional LP  Units  of that  Partnership,  (b)  propose any  merger  or  other
business  combination  involving  that  Partnership, or  (c)  propose  any other
transaction pursuant to which it would control  or acquire any of the assets  of
that Partnership.
 
    3.2  EXCLUSIVITY
 
    Until  the termination  of the Acquisition  Agreement or the  Closing of the
Merger, no General Partner will, nor will it permit its partners (including  any
general or limited partner), agents or other representatives (including, without
limitation,  any investment banker,  attorney or accountant  retained by it) to,
directly or indirectly, initiate, solicit or encourage or, except as required by
law, including fiduciary  duties required by  law as determined  by the  General
Partner in good faith, engage in discussions or negotiations with or provide any
information  to any entity or  group (other than the  Company or an affiliate of
the Company) concerning any acquisition proposal, tender offer, exchange  offer,
merger,  consolidation,  sale of  a  substantial amount  of  assets, or  sale of
securities or equity interests, or in connection with a liquidation, dissolution
or similar transaction  involving such  Partnership. Each  General Partner  will
notify  the Company immediately if any  such inquiries or proposals are received
by, any  such  information  is  requested from,  or  any  such  negotiations  or
discussions  are sought to be initiated  or continued with, the Partnership, and
will keep the Company informed of the status and terms of any such proposals and
any such negotiations or discussions.
 
    3.3  INDEMNIFICATION
 
    From and  after the  Effective Time,  the Company  will indemnify  and  hold
harmless the General Partner of each of the Partnerships, that shall have merged
with  and into  the Company  pursuant to  a Merger  and its  general and limited
partners to the same extent that such persons are entitled to be indemnified  by
the Partnership under its Partnership Agreement.
 
                                     A(A-2)
<PAGE>
ARTICLE IV.  MISCELLANEOUS
 
    4.1  NOTICES
 
    All  notices, demands  or other  writings in  this Agreement  provided to be
given or made or sent, or  which may be given or  made or sent, by either  party
hereto  to the other may  be given personally or  may be delivered by depositing
the same in the U.S. mail, certified, return receipt requested, postage  prepaid
or  by delivering the same to an  air courier service, postage prepaid, properly
addressed and sent  to the address  of such party  as set forth  below, or  such
other  address as either party may from time to time designate by written notice
to the  other. Notice  given by  mail  shall be  considered effective  upon  the
expiration of five business days after deposit. Notice given in any other manner
shall be effective only if and when received by the addressee.
 
<TABLE>
<S>                                             <C>
To the Company:                                 Shurgard Storage Centers, Inc.
                                                Attn: Harrell Beck
                                                1201 Third Avenue, Suite 2200
                                                Seattle, Washington 98101
 
with a copy to:                                 Latham & Watkins
                                                Attn: Scott R. Haber
                                                505 Montgomery Street, 19th Floor
                                                San Francisco, California 94111
 
To the General Partners:                        Shurgard Associates L.P.
                                                Shurgard Associates L.P. II
                                                Shurgard Associates L.P. III
                                                Attn: Charles K. Barbo
                                                1201 Third Avenue, Suite 2200
                                                Seattle, Washington 98101
 
with a copy to:                                 Perkins Coie
                                                Attn: Linda A. Schoemaker
                                                1201 Third Avenue, 40th Floor
                                                Seattle, Washington 98101-3099
</TABLE>
 
    4.2  INTERPRETATION
 
    Words  of any gender used  in this Agreement shall  be held and construed to
include any  other gender,  and words  of a  singular number  shall be  held  to
include the plural and vice versa, unless the context requires otherwise.
 
    4.3  CAPTIONS
 
    The  captions used in this Agreement are  for convenience only and shall not
be deemed to construe or to limit the meaning of the language of this Agreement.
 
    4.4  MULTIPLE COUNTERPARTS
 
    This Agreement may be executed in  any number of identical counterparts.  If
so  executed, each  of such  counterparts is  to be  deemed an  original for all
purposes, and all such counterparts shall collectively constitute one agreement,
but in making proof of  this Agreement it shall not  be necessary to produce  or
account for more than one such counterpart.
 
    4.5  APPLICABLE LAW
 
    This  Agreement shall  be governed by  and construed in  accordance with the
laws of the state of Washington.
 
                                     A(A-3)
<PAGE>
    IN WITNESS WHEREOF, this Agreement has been executed by each of the  parties
as of the date first set forth above.
 
                                          COMPANY:
 
                                          SHURGARD STORAGE CENTERS, INC.
 
                                          By /s/_HARRELL BECK___________________
                                             Harrell Beck, Chief Financial
                                             Officer
 
                                          GENERAL PARTNERS:
 
                                          Shurgard Associates L.P.
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo,
                                             General Partner
 
                                            /s/_ARTHUR W. BUERK_________________
                                            Arthur W. Buerk,
                                          General Partner
 
                                          Shurgard General Partner, Inc.
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo, President
 
                                          Shurgard Associates L.P. II
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo,
                                             General Partner
 
                                            /s/_ARTHUR W. BUERK_________________
                                            Arthur W. Buerk,
                                            General Partner
 
                                          Shurgard General Partner, Inc.
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo, President
 
                                          Shurgard Associates L.P. III
 
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo,
                                             General Partner
 
                                            /s/_ARTHUR W. BUERK_________________
                                            Arthur W. Buerk,
                                            General Partner
 
                                          Shurgard General Partner, Inc.
 
                                     A(A-4)
<PAGE>
                                          By /s/_CHARLES K. BARBO_______________
                                             Charles K. Barbo, President
 
                                     A(A-5)
<PAGE>
                                                                      APPENDIX B
 
                       SUMMARY PORTFOLIO APPRAISAL REPORT
 
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
                                      B-1
<PAGE>
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                              PAGE
                                                                                                            ---------
<S>                                                                                                         <C>
Letter of Transmittal.....................................................................................        B-3
Identification of Subject Portfolios......................................................................        B-5
Property Ownership and History............................................................................        B-5
Purpose of Appraisals.....................................................................................        B-5
Function of Appraisals....................................................................................        B-5
Scope of Appraisals.......................................................................................        B-5
Date of Valuation.........................................................................................        B-6
Value Definition..........................................................................................        B-6
Valuation Methodology.....................................................................................        B-7
  Site Inspections and Data Gathering.....................................................................        B-8
  Income and Expense Analysis.............................................................................        B-8
  Income Approach Analysis................................................................................        B-9
  Sales Comparison Analysis...............................................................................       B-10
  Sales Comparison Approach and Income Approach Reconciliation............................................       B-10
Portfolio Value Conclusions...............................................................................       B-11
Portfolio Summary--IDS/Shurgard Income Growth Partners L.P................................................       B-12
Portfolio Summary--IDS/Shurgard Income Growth Partners L.P. II............................................       B-13
Portfolio Summary--IDS/Shurgard Income Growth Partners L.P. III...........................................       B-14
Assumptions and Limiting Conditions.......................................................................       B-16
</TABLE>
 
                                      B-2
<PAGE>
- --------------------------------------------------------------------------------
                                                               1129 Broad Street
                                                       Shrewsbury, NJ 07702-4314
ROBERT A. STANGER & CO., INC.
                                                                  (908) 389-3600
                                                             FAX: (908) 389-1751
 FINANCIAL AND MANAGEMENT CONSULTANTS
                                                                  (908) 544-0779
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                                 June 26, 1996
 
IDS/Shurgard Income Growth Partners L.P.
IDS/Shurgard Income Growth Partners L.P. II
IDS/Shurgard Income Growth Partners L.P. III
1201 Third Avenue, Suite 2200
Seattle, Washington 98101
 
Gentlemen:
 
    IDS/Shurgard   Income  Growth  Partners  L.P.,  IDS/Shurgard  Income  Growth
Partners L.P.  II,  and  IDS/Shurgard  Income  Growth  Partners  L.P.  III  (the
"Partnerships")  have  engaged  Robert A.  Stanger  & Co.,  Inc.  ("Stanger") to
estimate the  market value  of the  portfolios of  self-storage facilities  (the
"Portfolios")  owned by each Partnership.  Such appraisals reflect the estimated
market value  of the  fee simple  interests or,  where appropriate,  leased  fee
interests  in each Portfolio as of December 31, 1995, assuming each Portfolio to
be free and  clear of any  existing debt or  other encumbrances (the  "Portfolio
Valuations").
 
    This  summary  appraisal report  is prepared  in accordance  with agreements
between Robert A. Stanger & Co., Inc.  and each of the Partnerships dated  March
8,  1996. In accordance with the agreements, Stanger has been engaged to perform
the appraisals  on  a limited  scope  basis  in conformity  with  the  departure
provisions  of the Uniform Standards of  Professional Appraisal Practice and the
standards of the Appraisal Institute as  they relate to limited scope  appraisal
reports.  We have relied upon the  Income Approach and Sales Comparison Approach
to value  and  have  been engaged  to  deliver  to the  Partnerships  a  summary
appraisal  report that is not  designed to meet the  requirements of Title XI of
the Financial  Institutions  Reform,  Recovery,  and  Enforcement  Act  of  1989
("FIRREA").
 
    Each Portfolio Valuation is based in part upon information supplied to us by
the  Partnerships  and  the property  manager,  including, but  not  limited to:
descriptions of the subject properties  (the "Properties"), unit mix,  operating
statements  of the  Properties, property  tax bills,  expense details, occupancy
reports, rent rolls and other supporting data. We have also received information
from interviews of property and Partnership management personnel. We have relied
upon such information and have assumed that the information provided is accurate
and complete. We have not attempted to independently verify such information.
 
    We are advised by the Partnerships that the purpose of the appraisals is  to
estimate  the  value  of  the  fee  interests  in  each  Portfolio  under market
conditions as of the appraisal date,  and that the Portfolio Valuations will  be
used solely in connection with a proposed tender offer for Partnership interests
and  merger of  each Partnership with  Shurgard Storage  Centers, Inc. ("SSCI").
Stanger understands that the Portfolio Valuations will be reviewed and  utilized
by  the  Partnerships in  connection with  the  above transactions,  and Stanger
agrees to the use of  the Portfolio Valuations for  this purpose subject to  the
terms and conditions of the agreements related thereto. For these purposes, this
summary  appraisal report was  prepared stating our opinion  as to the aggregate
fair market value of each  Partnership's interests in the respective  Portfolios
as of December 31, 1995. Portions of this
 
                                      B-3
<PAGE>
report  may be summarized and referenced in  a proxy statement or other offering
materials relating  to the  transactions, subject  to prior  review by  Stanger.
However,  the  attached  summary  appraisal report  should  be  reviewed  in its
entirety and is  subject to  the assumptions and  limiting conditions  contained
herein.  Background information  and analysis  upon which  value conclusions are
based has been retained in our files.
 
    Our review was undertaken solely for the purpose of providing an opinion  of
market  value, and we make  no representation as to  the adequacy of such review
for any other purpose. Our opinion is expressed with respect to the total market
value of each of  the Portfolios. Neither Stanger  nor the undersigned have  any
present   or  contemplated  future  financial   or  ownership  interest  in  the
Properties, the Partnerships or SSCI.
 
    The Portfolio Valuations  have been  prepared on  a limited  scope basis  in
conformity   with  the  departure   provisions  of  the   Uniform  Standards  of
Professional Appraisal Practice of the  Appraisal Institute, in accordance  with
agreements  between Robert  A. Stanger  & Co.,  Inc. and  the Partnerships dated
March 8, 1996. Pursuant to those agreements, Stanger has relied upon the  Income
Approach  and Sales  Comparison Approach  to value and  did not  employ the Cost
Approach.
 
    The appraisals are only an  estimate of the market  value of the fee  simple
interests  or, where appropriate, leasehold interests  in each of the Portfolios
as of  the  date of  valuation  and  should not  be  relied upon  as  being  the
equivalent  of the price  that would necessarily  be received in  the event of a
sale or  other disposition  of the  Portfolios. Changes  in corporate  financing
rates  or changes in real estate property  markets may result in higher or lower
values of real property. The use of other valuation methodologies might  produce
a  higher or lower value. Our opinion is subject to the assumptions and limiting
conditions set  forth  herein.  We  have used  methods  and  assumptions  deemed
appropriate in our professional judgment; however, future events may demonstrate
that  the  assumptions  were  incorrect  or  that  other,  different  methods or
assumptions may have been more appropriate.
 
    This summary appraisal report provides our value conclusion with respect  to
the  Portfolios, definitions of value,  discussions of the valuation methodology
employed, assumptions, and  limiting conditions.  The attached  exhibits are  an
integral part of this report.
 
    Based  upon the review described  herein, it is our  opinion that the market
value of  the  fee  simple  interests or,  where  appropriate,  the  leased  fee
interests in each Portfolio as of December 31, 1995 is as follows:
 
<TABLE>
<S>                                                         <C>
IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
 Forty Million, Three Hundred and Seventy Thousand Dollars
                ($40,370,000)
 
IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 Thirty Million, Five Hundred and Twenty Thousand Dollars
                ($30,520,000)
 
IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 Fifty Million, Eight Hundred and Ninety Thousand Dollars
                ($50,890,000)
</TABLE>
 
                                          Sincerely,
 
                                          Robert A. Stanger & Co., Inc.
                                          Shrewsbury, New Jersey
 
                                      B-4
<PAGE>
                      IDENTIFICATION OF SUBJECT PORTFOLIOS
 
    The  subjects of  this summary appraisal  report are the  portfolios of real
properties (the "Portfolios") in which IDS/Shurgard Income Growth Partners L.P.,
IDS/Shurgard Income  Growth Partners  L.P. II,  and IDS/Shurgard  Income  Growth
Partners L.P. III own interests.
 
    The  Portfolio of IDS/Shurgard  Income Growth Partners  L.P. is comprised of
twelve self-storage properties,  aggregating approximately  684,000 square  feet
(as adjusted for certain joint venture interests), located in six states.
 
    The Portfolio of IDS/Shurgard Income Growth Partners L.P. II is comprised of
eight  self-storage properties,  aggregating approximately  534,000 square feet,
located in five states.
 
    The Portfolio of IDS/Shurgard Income  Growth Partners L.P. III is  comprised
of   sixteen  self-storage  properties  and   one  office  property  aggregating
approximately 1,004,000  square  feet,  located  in  seven  states.  (A  summary
description of each Portfolio is provided elsewhere in this report.)
 
                         PROPERTY OWNERSHIP AND HISTORY
 
    All the properties in the IDS/Shurgard Income Growth Partners L.P. Portfolio
are  owned by IDS/ Shurgard  Income Growth Partners L.P.,  with the exception of
four properties located  in Michigan (the  "JV Properties") which  are owned  by
Shurgard Joint Partners II, a joint venture in which IDS/ Shurgard Income Growth
Partners  L.P. owns a 70% interest. The IDS/Shurgard Income Growth Partners L.P.
Properties were purchased by  the Partnership and/or  the Joint Venture  between
1988 and 1990.
 
    All  the  properties  in the  IDS/Shurgard  Income Growth  Partners  L.P. II
Portfolio are owned  by IDS/Shurgard  Income Growth  Partners L.P.  II and  were
purchased by the Partnership between 1988 and 1991.
 
    All  the  properties in  the IDS/Shurgard  Income  Growth Partners  L.P. III
Portfolio are owned  by IDS/Shurgard Income  Growth Partners L.P.  III and  were
purchased  by  the Partnership  between  1991 and  1994.  Information concerning
properties purchased within the past three years has been reviewed and  retained
in our files.
 
                             PURPOSE OF APPRAISALS
 
    The  purpose of the  appraisals is to  estimate the market  value of the fee
simple interests or, where appropriate,  leased fee interests in the  Portfolios
under market conditions as of December 31, 1995.
 
                             FUNCTION OF APPRAISALS
 
    The  function of the appraisals  is to provide a  current estimate of market
value of the fee simple interests or, where appropriate, leased fee interests in
the Portfolios for use solely by the Partnerships in connection with a  proposed
tender  offer for interests  in the Partnerships and  merger of the Partnerships
with Shurgard Storage Centers, Inc. No representation is made as to the adequacy
of this appraisal for any other purpose.
 
                              SCOPE OF APPRAISALS
 
    The Portfolio Valuations  have been  prepared on  a limited  scope basis  in
conformity   with  the  departure   provisions  of  the   Uniform  Standards  of
Professional Appraisal Practice of the  Appraisal Institute, in accordance  with
agreements  between Robert  A. Stanger  & Co.,  Inc. and  the Partnerships dated
March 8, 1996. Pursuant to those agreements, Stanger has relied upon the  Income
Approach  and Sales  Comparison Approach  to value and  did not  employ the Cost
Approach (as described below).
 
    In estimating the value of  a property, appraisers typically consider  three
approaches  to value: the  Cost Approach, the Sales  Comparison Approach and the
Income Approach. The type and age of a
 
                                      B-5
<PAGE>
property, market conditions  and the  quantity and  quality of  data affect  the
applicability  of each  approach in  a specific  appraisal situation.  The value
estimated by the Cost Approach incorporates  separate estimates of the value  of
the  unimproved  site  under its  highest  and best  use  and the  value  of the
improvements, less observed  accrued depreciation resulting  from physical  wear
and  tear and functional and/or economic  obsolescence. The Market Data or Sales
Comparison Approach involves a comparative analysis of the subject property with
other similar properties that have sold  recently or that are currently  offered
for sale in the market. The Income Approach involves an economic analysis of the
property based on its potential to provide future net annual income.
 
    Pursuant  to  the terms  of our  engagement,  the Portfolio  Valuations were
performed using  the Income  Approach  and Sales  Comparison Approach.  Since  a
primary  buyer group for the type of property appraised herein is investors, the
Income Approach and Sales Comparison Approach were deemed appropriate  valuation
methodologies. Further, given the primary criteria used by buyers of the type of
property  appraised herein, the Cost Approach  was considered less reliable than
either of the Income Approach or Sales Comparison Approach.
 
    Changes in corporate financing  rates generally or  in real estate  property
markets  may result in higher or lower values of real property. The use of other
valuation methodologies might produce  a higher or lower  value. Our opinion  is
subject to the assumptions and limiting conditions set forth herein.
 
    Departures  -- Uniform Standards of Professional Practice -- With respect to
the limited appraisals,  the departure  provisions of the  Uniform Standards  of
Professional  Appraisal Practice permit departures  from the specific guidelines
of Standard 1. In this report the following departures were taken:
 
<TABLE>
<C>                    <S>
 Standard Rule 1-4 (b) Details relating to comparable sales and rental data and
                       reconciliations of value for each property are not
                       specifically described or set forth in this report but have
                       been retained in our files.
</TABLE>
 
                               DATE OF VALUATION
 
    The date of valuation for the Portfolios is December 31, 1995.
 
                                VALUE DEFINITION
 
    Market value, as used in this report and defined by the Appraisal Institute,
is the most probable price as of a specified date, in cash, in terms  equivalent
to  cash, or in other precisely revealed terms, for which the specified property
rights should sell after reasonable exposure  in a competitive market under  all
conditions  requisite to  a fair  sale, with  the buyer  and seller  each acting
prudently, knowledgeably and  for self-interest,  and assuming  that neither  is
under undue duress.
 
    Implicit  in this definition is the consummation of a sale as of a specified
date and the passing of title from seller to buyer under conditions whereby:
 
    (a) buyer and seller are typically motivated;
 
    (b) both parties  are well  informed or  well advised,  and each  acts in  a
       manner he considers in his own best interest;
 
    (c) a reasonable time is allowed for exposure in the open market;
 
    (d)  payment  is made  in  terms of  cash  in U.S.  dollars  or in  terms of
       financial arrangements comparable thereto; and
 
    (e) the  price represents  the normal  consideration for  the property  sold
       unaffected  by special or creative financing or sales concessions granted
       by anyone associated with the sale.
 
(Source: THE APPRAISAL OF REAL ESTATE, Tenth Edition.)
 
                                      B-6
<PAGE>
    The property rights appraised in this report consist of fee simple interests
or, where appropriate, leased  fee interests. Due  to the generally  short-term,
month  to month tenancies in self-storage  facilities, a fee simple interest was
deemed appropriate  for  such facilities.  Fee  simple interest  is  defined  as
absolute  ownership unencumbered by any other interest or estate subject only to
the limitations of eminent domain, escheat, police power and taxation.
 
    Leased fee interest is defined as  an ownership interest held by a  landlord
with  the right to  use and occupancy  conveyed by lease  to others, and usually
consists of the  right to  receive rent  and the  right to  repossession at  the
termination of the lease.
 
    In  the case  of the  JV Properties, the  property rights  appraised are fee
simple interests and the values reported  herein reflect a pro-rata interest  of
IDS/Shurgard  Income Growth Partners L.P. in  such fee simple value based solely
on its 70% interest in the joint venture.
 
    The appraisals include the value of land, land improvements such as  paving,
fencing,  on-site sewer and  water lines, and  the buildings as  of December 31,
1995. The appraisals do  not include supplies,  materials on hand,  inventories,
furniture,  equipment or other personal property, company records, or current or
intangible  assets  that  may  exist.  The  appraisals  pertain  only  to  items
considered as real estate.
 
                             VALUATION METHODOLOGY
 
    Pursuant to the terms of this engagement, Stanger has estimated the value of
the fee simple interests or, where appropriate, the leased fee interests in each
Portfolio's  Properties  based  on  the  Income  Approach  and  Sales Comparison
Approach to  valuation. (Appraisers  typically  use up  to three  approaches  in
valuing  real property:  the Cost Approach,  the Income Approach,  and the Sales
Comparison Approach. The type and age  of a property, market conditions and  the
quantity  and quality  of data  affect the applicability  of each  approach in a
specific appraisal situation.)
 
    The Income Approach is based on the assumption that the value of a  property
or  portfolio  of properties  is dependent  upon  the property's  or portfolio's
ability to produce income. The  Income Approach estimates a property's  capacity
to  produce income through an analysis  of the rental market, operating expenses
and net operating income.  Net income may then  be processed into value  through
either  (or a combination  of) two methods:  direct capitalization or discounted
cash flow  analysis.  In these  Portfolio  Valuations, a  direct  capitalization
analysis  and a discounted cash flow ("DCF")  analysis are used to determine the
value of the fee simple interests or, where appropriate, leased fee interests in
each Portfolio Property. The indicated  value by the Income Approach  represents
the  amount an investor  may pay for  the expectation of  receiving the net cash
flow from the Portfolio  Properties and proceeds from  the ultimate sale of  the
Portfolio Properties.
 
    The direct capitalization analysis is based upon the estimated net operating
income  of each Portfolio Property  capitalized at an appropriate capitalization
rate based upon  property characteristics  and competitive  position and  market
conditions as of the date of the appraisal.
 
    In  applying  the DCF  analysis, Stanger  utilized  pro forma  statements of
operations for each Portfolio Property including revenues and expenses projected
over a ten-year period. Each Portfolio Property is assumed to be sold at the end
of the ten-year holding period. The  reversion value of each Portfolio  Property
which  can be realized  upon sale at the  end of the  ten-year holding period is
estimated based on capitalization of the estimated net income of the property in
the year of sale, utilizing a capitalization rate deemed appropriate in light of
the age,  anticipated  functional  and  economic  obsolescence  and  competitive
position  of  the property  at  the time  of sale.  Net  proceeds to  owners are
determined by deducting appropriate  costs of sale.  The discount rate  selected
for  the DCF analysis is based upon  estimated target rates of return for buyers
of self-storage properties. Total estimated  value for the Portfolio  Properties
is  arrived at by summing  the discounted present value  of the cash flow stream
from operations and net proceeds from sale for each property.
 
                                      B-7
<PAGE>
    The Sales Comparison Approach utilizes indices of value derived from  actual
or  proposed  sales  of  comparable  properties to  estimate  the  value  of the
Portfolio Property. Price  per square  foot --  a unit  of comparison  typically
analyzed  for  self-storage facilities  -- was  utilized  in applying  the Sales
Comparison Approach to the Portfolio Properties.
 
    The following  describes more  fully  the steps  involved in  the  valuation
methodology utilized.
 
SITE INSPECTIONS AND DATA GATHERING
 
    In conducting the Portfolio Valuations, representatives of Stanger performed
a site inspection of each Portfolio Property during March 1996. In the course of
these  site visits,  the physical  facilities of  each property  were inspected,
current rental and occupancy information for the property was obtained,  current
market   rental  rates  for  competing  properties  were  investigated,  primary
competing properties were visited, information on the local market was gathered,
and the  on-site manager  or assistant  manager was  interviewed concerning  the
property  and other factors. Information gathered during the site inspection was
supplemented  by  a  review   of  published  information  concerning   economic,
demographic and real estate trends in local or regional and national markets.
 
    In  conducting  the appraisals,  Stanger  also interviewed  and  relied upon
Partnership and property management personnel to obtain information relating  to
the  condition  of each  property, including  any deferred  maintenance, capital
budgets, known environmental  conditions, status  of on-going  or newly  planned
property  additions, reconfigurations, improvements, and other factors affecting
the physical condition of the property improvements.
 
    In addition, Stanger  interviewed district and/or  regional managers of  the
Portfolio  Properties,  SSCI  management  personnel  and  Partnership management
personnel. Such  interviews included  discussions of  competitive conditions  in
local  markets,  area  economic  and development  trends  affecting  the subject
properties,  historical  and  budgeted  operating  revenues  and  expenses   and
occupancies.  Stanger  also reviewed  historical  operating statements  and 1996
operating budgets for  each Portfolio  Property, and reviewed  surveys of  local
self-storage markets conducted by property management personnel.
 
    To  define the occupancy, rental  rate and expense escalators  to be used in
developing operating projections, Stanger reviewed the acquisition criteria  and
projection parameters in use in the marketplace by major self-storage investors,
owners  and operators. In addition, Stanger reviewed other published information
concerning acquisition criteria in  use by property investors  at or around  the
valuation date. Further, Stanger interviewed various sources in local markets to
identify recent sales of self-storage properties and to derive certain valuation
indicators.  Sources for  transaction data  included local  appraisers, property
owners, real estate brokers, tax assessors, and real estate research firms.
 
    In addition, Stanger reviewed the  acquisition criteria and parameters  used
by  self-storage real  estate investors. Such  review included a  search of real
estate data sources  and publications concerning  real estate buyer's  criteria,
and   direct  telephonic  interviews  with  major  national  investors,  owners,
managers,  brokers  and  appraisers  of  self-storage  property  portfolios   to
investigate the interaction of such factors as required rates of return, initial
capitalization rate requirements, and property type or geographical preferences.
 
    Stanger  also compiled  data on  actual transactions  involving self-storage
properties from  which  acquisition  criteria  and  parameters  were  extracted.
Stanger  reviewed publicly available information on acquisitions of self-storage
properties by certain publicly owned real estate companies and contacted various
industry sources for relevant data.
 
INCOME AND EXPENSE ANALYSIS
 
    During the  course  of  the  site  inspections,  competing  properties  were
identified  and data on  local market rental rates  and occupancy were obtained.
Such data  was compared  to national  averages for  self-storage properties  and
posted  rental  rates, the  rent  roll and  occupancy  reports for  each subject
 
                                      B-8
<PAGE>
property, as  available.  Historical and  budgeted  effective gross  income  and
income  from ancillary sources  was also reviewed for  each subject property. In
addition, discussions  were conducted  with  relevant Partnership  and  property
management  personnel  concerning  property and  market  trends  and competitive
conditions. After  assessing  the  above  factors,  an  effective  gross  income
estimate  was  prepared for  each property  based  upon the  unit configuration,
market rental rates, market occupancy rate and estimates of ancillary income.
 
    Historical and budgeted data on expenses were obtained from each Partnership
for each  property.  In addition,  property  tax  bills were  obtained  and  tax
assessments   were  confirmed  with  local  municipalities.  Expenses  for  each
individual property were  estimated based on  historical and budgeted  operating
expenses, discussions with management and certain industry expense guidelines.
 
    Estimated  expenses  were  then  deducted  from  estimated  income  for each
property to arrive at each properties' estimated net operating income.  Expenses
relating solely to investor reporting and accounting were excluded.
 
    During  the course  of the  site inspections,  any deferred  maintenance was
observed.  Historical  and  budgeted  capital  expenditures  were  reviewed  and
discussed  with management, and appropriate capital expenditures were considered
in the analysis.
 
INCOME APPROACH ANALYSIS
 
    Stanger then employed  both direct capitalization  and discounted cash  flow
analysis   to  estimate  the  value  of   the  subject  properties.  The  direct
capitalization rate  used  was  based  on  current  acquisition  criteria  among
self-storage  investors  and  reflected in  specific  sales  transactions. Where
appropriate, the  capitalization  rate  used  for  an  individual  property  was
adjusted  to reflect valuation  factors unique to the  property, such as overall
quality, recent  buildouts,  and  other unique  valuation  facts  affecting  the
individual  properties.  Where  deferred  maintenance  or  extraordinary capital
expenditures were required the capitalized value was adjusted accordingly.
 
        - DIRECT CAPITALIZATION ANALYSIS -- Based upon the net  operating
          income  estimated in accordance with  the analyses of effective
          gross income and expenses described above, an estimate of value
          was derived  for each  Portfolio Property  by capitalizing  the
          estimated   net  operating  income  at  a  rate  determined  in
          accordance with surveys of  buyers of self-storage  properties,
          as  confirmed by a review of comparable sales transactions, and
          deemed appropriate given the characteristics of each  property.
          Capitalization  rates ranging from 9.25% to 10.25% were applied
          to  the  projected  net  operating  income  from  each  of  the
          Portfolio  Properties which were considered to be at stabilized
          occupancy  during   the  twelve-month   period  following   the
          valuation date.
 
        - DISCOUNTED  CASH FLOW  ANALYSIS -- In  applying discounted cash
          flow analysis,  projections of  cash flows  from each  property
          (assuming no indebtedness thereon) for a ten-year period ending
          December  31, 2005 were developed.  The base year projection of
          net operating income  was prepared consistent  with the  direct
          capitalization  analysis based  upon the  analysis of effective
          gross income and expenses  described above. Income and  expense
          escalators  used in  developing the  projections were  based on
          projection parameters  in  use  as of  the  Valuation  Date  by
          property  investors,  market factors,  historical  and budgeted
          financial results  for  each  property,  and  inflation  rates.
          Income  escalators generally ranged from  3% to 3.5%. In highly
          competitive markets or where a property's operations were below
          stabilized levels, income  escalators were  adjusted as  deemed
          appropriate  or  until  stabilized  operations  were  achieved.
          Effective expense  escalators  generally ranged  from  2.7%  to
          3.5%.
 
    To  determine  the  residual value  for  each  property at  the  end  of the
projection period, the estimated  net operating income of  the property for  the
twelve months ending December 2006 was
 
                                      B-9
<PAGE>
capitalized   at  a   rate  deemed   appropriate  for   the  property.  Terminal
capitalization rates generally ranged  from 10.0% to 10.75%  and for the  office
property  was 11.0%. The residual value was  discounted to a present value after
deducting appropriate sales expenses using the same discount rate applied to the
stream of annual  cash flows. The  discount rate employed  was based on  current
acquisition   criteria   among  self-storage   investors,  commercial/industrial
property investors' target rates of return,  and the historical spread in  rates
of  return between  real estate and  other investments.  Discount rates utilized
ranged from 12.0% to 12.5%.
 
    The results  of each  analysis (direct  capitalization and  discounted  cash
flow)  then  were  correlated  to  arrive  at  a  final  income  approach  value
determination.
 
SALES COMPARISON ANALYSIS
 
    In the course of performing the Portfolio Valuations, Stanger compiled  data
on  actual transactions  involving properties similar  in type  to the Portfolio
Properties. To gather such  data, Stanger interviewed  various sources in  local
markets  to identify recent sales  of self-storage or office/storage properties,
reviewed  publicly  available  information   on  acquisitions  of   self-storage
properties by certain publicly owned real estate companies, reviewed information
provided by management, and contacted various industry sources for data.
 
    For each Portfolio Property, the data was grouped into local and/or regional
transactions.  Where  local  transactions  sample  sizes  were  small  or dated,
regional and/or national data was relied upon.
 
    Utilizing such data,  an index  of value was  derived based  upon price  per
square  foot. The index of value was applied to each property to estimate value.
Price per square foot as estimated by reference to comparable sales transactions
was multiplied by  the rentable  square footage of  each property  to derive  an
estimated range of value.
 
    In  addition,  Stanger  conducted  a  statistical  analysis  of self-storage
property transaction data  to determine  value indicators  reflective of  recent
market  conditions. Due to  the relatively low number  of recent transactions in
any specific local or regional market from which to extract reliable statistical
indicators, Stanger  utilized  a  sample  of  recent  national  transactions.  A
regression  analysis  was performed  to determine  the relationship  between the
price per square foot paid in  recent transactions and the net operating  income
of  the property acquired. Based on this analysis, a probable range of value per
square foot was derived for each  property. The resulting indicated values  were
reconciled.
 
    In  the  case of  the Stone  Mountain  and Forest  Park properties  owned by
IDS/Shurgard  Income   Growth  Partners   L.P.  III,   the  valuation   included
consideration  of the  value of excess  land parcels currently  held for resale.
Such values were  determined utilizing  the sales comparison  approach based  on
analysis  of transactions  involving land  parcels in  the local  market of each
property.
 
SALES COMPARISON APPROACH AND INCOME APPROACH RECONCILIATION
 
    The estimated  values  resulting from  the  Sales Comparison  Approach  were
reconciled  with the values estimated resulting from the Income Approach (direct
capitalization and discounted cash flow  analyses) for each Portfolio  Property,
and the resulting values were summed to determine the estimated value of each of
the Portfolios.
 
    The  Income  Approach  reflects  the quality,  durability  and  risk  of the
estimated income stream. Properties such as the subject Portfolio Properties are
typically purchased and sold based upon their income characteristics. The Income
Approach was given primary consideration based upon the income producing  nature
of  the Portfolio Properties and their appeal to investors. The Sales Comparison
Approach was given secondary consideration.
 
    Where necessary, Stanger  adjusted the value  conclusion for each  Portfolio
Property  to reflect any deferred maintenance items, excess land associated with
the Property, and joint venture interests, if any.
 
                                      B-10
<PAGE>
                          PORTFOLIO VALUE CONCLUSIONS
 
    Based upon the review as described above, it is our opinion that the  market
value  of  the  fee  simple  interests or,  where  appropriate,  the  leased fee
interests in each Portfolio as of December 31, 1995 is as follows:
 
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
           FORTY MILLION, THREE HUNDRED AND SEVENTY THOUSAND DOLLARS
                                  $40,370,000
 
                            ------------------------
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
 
            THIRTY MILLION, FIVE HUNDRED AND TWENTY THOUSAND DOLLARS
 
                                  $30,520,000
 
                            ------------------------
 
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
 
            FIFTY MILLION, EIGHT HUNDRED AND NINETY THOUSAND DOLLARS
 
                                  $50,890,000
 
                            ------------------------
 
                                      B-11
<PAGE>
                               PORTFOLIO SUMMARY
                    IDS/SHURGARD INCOME GROWTH PARTNERS L.P.
                               DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                        RENTABLE
                                                                                         SQUARE
  NUMBER                    PROPERTY ADDRESS                           TYPE             FOOTAGE
- -----------  -----------------------------------------------  ----------------------  ------------
<C>          <S>                                              <C>                     <C>
       1-1   Shurgard of Ontario                                   Self-Storage          56,900
             2249 South Grove Ave., Ontario, CA
       1-2   Shurgard of Walnut                                    Self-Storage          95,500
             21035 East Washington St., Walnut, CA
       1-3   Shurgard of Margate                                   Self-Storage          75,300
             5150 West Copans Road, Margate, FL
       1-4   Shurgard Morgan Falls                                 Self-Storage          75,700
             7760 Roswell Road, Dunwoody, GA
       1-5   Shurgard of Burke                                     Self-Storage          31,900
             5609 Guinea Road, Fairfax, VA
       1-6   Shurgard of Midlothian Turnpike                       Self-Storage          43,500
             10110 Midlothian Turnpike,
             Richmond, VA
       1-7   Shurgard of S. Military Hwy                           Self-Storage          48,300
             788 South Military Hwy.,
             Virginia Beach, VA
       1-8   Shurgard of Factoria Square                           Self-Storage          70,200
             4041 124th Avenue SE., Bellevue, WA
     JP2-1   Shurgard of Canton                                    Self-Storage          40,800(1)
             2101 Haggerty Road, Canton, MI
     JP2-2   Shurgard of Fraser                                    Self-Storage          50,900(1)
             32775 Groesbeck Road, Fraser, MI
     JP2-3   Shurgard of Livonia                                   Self-Storage          47,000(1)
             30300 Plymouth Road, Livonia, MI
     JP2-4   Shurgard of Warren                                    Self-Storage          47,700(1)
             2498 10 Mile Road, Warren, MI
</TABLE>
 
- ------------------------
(1) Rentable square footage of the property reflects the Partnership's 70%
    interest in the joint venture which owns the Property.
 
                                      B-12
<PAGE>
                               PORTFOLIO SUMMARY
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. II
                               DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                        RENTABLE
                                                                                         SQUARE
  NUMBER                    PROPERTY ADDRESS                           TYPE              FOOTAGE
- -----------  -----------------------------------------------  ----------------------  -------------
<C>          <S>                                              <C>                     <C>
       2-1   Shurgard of Orange                                    Self-Storage           89,600
             623 West Collins Ave., Orange, CA
       2-2   Shurgard of Sterling Heights                          Self-Storage          103,800
             36260 Van Dyke Ave.,
             Sterling Heights, MI
       2-3   Shurgard of T.C. Jester                               Self-Storage           64,000
             2100 North Loop West, Houston, TX
       2-4   Shurgard of Newport News North                        Self-Storage           59,100
             13142 N. Jefferson Ave.,
             Newport News, VA
       2-5   Shurgard of Chesapeake                                Self-Storage           58,400
             940 Professional Place, Chesapeake, VA
       2-6   Shurgard of Leesburg                                  Self-Storage           27,600
             11 Lawson Road SE., Leesburg, VA
       2-7   Shurgard of Kennydale                             Self-Storage/Retail        66,500
             1755 NE 48th Street, Renton, WA
       2-8   Shurgard of Bellefield                                Self-Storage           65,100
             1111 118th Avenue SE., Bellevue, WA
</TABLE>
 
                                      B-13
<PAGE>
                               PORTFOLIO SUMMARY
                  IDS/SHURGARD INCOME GROWTH PARTNERS L.P. III
                               DECEMBER 31, 1995
 
<TABLE>
<CAPTION>
                                                                                        RENTABLE
                                                                                         SQUARE
  NUMBER                    PROPERTY ADDRESS                           TYPE             FOOTAGE
- -----------  -----------------------------------------------  ----------------------  ------------
<C>          <S>                                              <C>                     <C>
       3-1   Shurgard of Gilbert                                   Self-Storage          65,800
             405 North Gilbert, Gilbert, AZ
       3-2   Shurgard of Dobson Ranch                              Self-Storage          58,500
             2640 South Alma School Road,
             Mesa, AZ
       3-3   Shurgard of Castro Valley                             Self-Storage          69,300
             21655 & 21082 Redwood Road,
             Castro Valley, CA
       3-4   Castro Valley Office Building                            Office              3,100
             21663 Redwood Road,
             Castro Valley, CA
       3-5   Shurgard of Newark                                    Self-Storage          61,500
             37444 Cedar Boulevard, Newark, CA
       3-6   Shurgard of Sacramento                                Self-Storage          53,100
             8959 Pocket Road, Sacramento, CA
       3-7   Shurgard of San Leandro                               Self-Storage          58,500
             2011 Marina Boulevard,
             San Leandro, CA
       3-8   Shurgard of San Lorenzo                               Self-Storage          54,100
             16025 Ashland Avenue,
             San Lorenzo, CA
       3-9   Shurgard of Delray Beach                              Self-Storage          77,300
             6000 West Atlantic Avenue,
             Delray Beach, FL
      3-10   Shurgard of Norcross                                  Self-Storage          61,800
             5010 Jimmy Carter Boulevard, Norcross, GA
      3-11   Shurgard of Stone Mountain                            Self-Storage          61,200(1)
             840 Hambrick Road,
             Stone Mountain, GA
      3-12   Shurgard of Tucker                                Self-Storage/Office       60,000
             2660 Mountain Industrial Boulevard, Tucker, GA
      3-13   Shurgard of Forest Park                               Self-Storage          65,200(2)
             5979 Old Dixie Road, Forest Park, GA
      3-14   Shurgard of Rochester/Utica                           Self-Storage          56,600
             2100 West Utica Road, Utica, MI
      3-15   Shurgard of Allen Boulevard                           Self-Storage          42,500
             11160 SW Allen Boulevard,
             Beaverton, OR
</TABLE>
 
                                      B-14
<PAGE>
<TABLE>
<CAPTION>
                                                                                        RENTABLE
                                                                                         SQUARE
  NUMBER                    PROPERTY ADDRESS                           TYPE             FOOTAGE
- -----------  -----------------------------------------------  ----------------------  ------------
      3-16   Shurgard of Windcrest                                 Self-Storage          86,200
             10652 Interstate Hwy 35 N,
             San Antonio, TX
<C>          <S>                                              <C>                     <C>
      3-17   Shurgard of Tracy                                     Self-Storage          69,600
             400 West Larch Road, Tracy, CA
</TABLE>
 
- ------------------------
(1) Stone Mountain Property includes approximately 1.5 acres of excess land held
    for resale.
 
(2) Forest Park Property includes approximately  1.99 acres of excess land  held
    for resale.
 
                                      B-15
<PAGE>
                      ASSUMPTIONS AND LIMITING CONDITIONS
 
    This  summary appraisal  report is subject  to the  assumptions and limiting
conditions as set forth below.
 
    1.  No responsibility is assumed for matters of a legal nature affecting the
Portfolio Properties or the titles thereto. Titles to the properties are assumed
to be good and marketable and the  properties are assumed free and clear of  all
liens unless otherwise stated.
 
    2.   The Portfolio Valuations assume (a) responsible ownership and competent
management of the properties; (b) there  are no hidden or unapparent  conditions
of the properties' subsoil or structures that render the properties more or less
valuable  (no responsibility is assumed for such conditions or for arranging for
engineering studies that may be required to discover them); (c) full  compliance
with  all applicable federal,  state and local  zoning, access and environmental
regulations and laws, unless noncompliance is stated, defined and considered  in
the  Appraisal; and  (d) all  required licenses,  certificates of  occupancy and
other governmental consents have been or can be obtained and renewed for any use
on which the value estimates contained in the Portfolio Valuations are based.
 
    3.  The Appraiser shall not be required to give testimony or appear in court
because of  having  made the  appraisal  with  reference to  the  portfolios  in
question, unless arrangements have been previously made therefore.
 
    4.   The information contained in the Portfolio Valuations or upon which the
Portfolio Valuations are  based has been  provided by or  gathered from  sources
assumed  to be reliable and accurate. Some of such information has been provided
by the owner of the properties. The  Appraiser shall not be responsible for  the
accuracy  or  completeness of  such  information, including  the  correctness of
estimates,  opinions,  dimensions,  exhibits  and  other  factual  matters.  The
Portfolio  Valuations and the opinion of value stated therein are as of the date
stated in  the  Portfolio  Valuations.  Changes since  that  date  in  property,
external and market factors can significantly affect portfolio value.
 
    5.   Disclosure of the  contents of the appraisal  report is governed by the
Bylaws and Regulations of the professional appraisal organization with which the
Appraiser is affiliated.
 
    6.  Neither all, nor any part of the content of the report, or copy  thereof
(including  conclusions  as  to  the portfolios'  values,  the  identity  of the
Appraiser, professional designations,  reference to  any professional  appraisal
organizations,  or the firm with which the Appraiser is connected) shall be used
for any  purpose  by anyone  other  than the  client  specified in  the  report,
including,  but not limited  to, the mortgagee or  its successors and assignees,
mortgage insurers, consultants, professional appraisal organizations, any  state
or   federally  approved  financial  institution,   any  department,  agency  or
instrumentality without the previous written consent of the Appraiser; nor shall
it be conveyed by  anyone to the public  through advertising, public  relations,
news  sales or  other media,  without the  written consent  and approval  of the
Appraiser.
 
    7.  On  all appraisals subject  to completion, repairs  or alterations,  the
appraisal  report and  value conclusions are  contingent upon  completion of the
improvements in a workmanlike manner.
 
    8.  The physical condition of  the improvements considered by the  Portfolio
Valuations   are  based  on   visual  inspection  by   the  Appraiser  or  other
representatives of Stanger and on representations by the owner. Stanger  assumes
no  responsibility for the soundness of  structural members or for the condition
of mechanical equipment,  plumbing or electrical  components. The Appraiser  has
made no surveys of the Portfolio Properties.
 
    9.   The  projections of  income and  expenses and  the valuation parameters
utilized are not  predictions of the  future. Rather, they  are the  Appraiser's
best estimate of current market thinking relating to future income and expenses.
The  Appraiser makes no warranty or  representations that these projections will
materialize. The real estate market  is constantly fluctuating and changing.  It
is not the Appraiser's task to predict or in any way warrant the conditions of a
future  real estate market;  the Appraiser can only  reflect what the investment
community, as of the date of the Appraisal,
 
                                      B-16
<PAGE>
                ASSUMPTIONS AND LIMITING CONDITIONS (CONTINUED)
envisions for the future in terms of rental rates, expenses, supply and  demand.
We  have used  methods and  assumptions deemed  appropriate in  our professional
judgment; however,  future  events may  demonstrate  that the  assumptions  were
incorrect  or that  other different  methods or  assumptions may  have been more
appropriate.
 
    10. The  Portfolio  Valuations represent  a  normal consideration  for  each
Portfolio's Properties based on a cash purchase and unaffected by special terms,
services, fees, costs, or credits incurred in the transaction.
 
    11.  Unless  otherwise  stated in  the  report, the  existence  of hazardous
materials, which may or may not be present on the Portfolio Properties, was  not
disclosed  to the Appraiser by the owner.  The Appraiser has no knowledge of the
existence of such  materials on  or in  the Portfolio  Properties. However,  the
Appraiser is not qualified to detect such substances. The presence of substances
such  as  asbestos,  ureaformaldehyde  foam  insulation,  oil  spills,  or other
potentially hazardous  materials may  affect the  value of  the Portfolios.  The
Portfolio Value estimates are predicated on the assumption that there is no such
material  on or in the Portfolio Properties that would cause a loss of value. No
responsibility  is  assumed  for  such  conditions,  or  for  any  expertise  or
engineering  knowledge required to discover them.  The client is urged to retain
an expert in this field, if desired.
 
    12. For purposes of this report, it is assumed that each Portfolio  Property
is  free  of  any  negative  impact with  regard  to  the  Environmental Cleanup
Responsibility Act (ECRA) or any other environmental problems or with respect to
non-compliance with the Americans with Disabilities Act (ADA). No  investigation
has  been made by the  Appraiser with respect to  any potential environmental or
ADA problems. Environmental and ADA compliance studies are not within the  scope
of this report.
 
    13.  Pursuant to  the Engagement  Agreements, the  Portfolio Valuations have
been prepared  on  a  limited scope  basis  using  a summary  report  format  in
conformity   with  the  departure   provisions  of  the   Uniform  Standards  of
Professional Appraisal  Practice and  the  Standards of  Professional  Appraisal
Practice  of the Appraisal  Institute, relying on the  income approach and sales
comparison approach to value.  Further, the engagements call  for delivery of  a
summary  appraisal report  in which  the content has  been limited  to that data
presented herein. As such, the summary appraisal report is not designed to  meet
the  requirements  of Title  XI of  the  Federal Financial  Institutions Reform,
Recovery  and   Enforcement  Act   of  1989.   Therefore,  federally   regulated
institutions should not rely on this report for financing purposes.
 
    14.  The Portfolio Valuations reported herein may not reflect the premium or
discount a potential buyer may assign to an assembled portfolio of properties or
to  a  group  of  properties  in  a  particular  local  market  which   provides
opportunities  for enhanced market presence  and penetration. In addition, where
properties are owned  jointly with  other entities affiliated  with the  general
partner, minority interest discounts were not applied.
 
    15.  The appraisals are solely  for the purpose of  providing our opinion of
the value of the Portfolios, and we make no representation as to the adequacy of
such reviews for any  other purpose. The owner  has directed that the  Portfolio
Properties be valued assuming the properties are free and clear of any debt. The
use of other valuation methodologies might produce a higher or lower value.
 
    16.  In addition to  these general assumptions  and limiting conditions, any
assumptions or conditions applicable to  specific properties have been  retained
in our files.
 
                                      B-17
<PAGE>
                                                                      APPENDIX C
 
- --------------------------------------------------------------------------------
                                                               1129 Broad Street
                                                       Shrewsbury, NJ 07702-4314
ROBERT A. STANGER & CO., INC.
                                                                  (908) 389-3600
                                                             FAX: (908) 389-1751
 FINANCIAL AND MANAGEMENT CONSULTANTS
                                                                  (908) 544-0779
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
IDS/Shurgard Income Growth Partners L.P.
IDS/Shurgard Income Growth Partners L.P. II
IDS/Shurgard Income Growth Partners L.P. III
1201 Third Avenue, Suite 2200
Seattle, Washington 98101
 
Gentlemen:
 
    We  have  been  advised  that  IDS/Shurgard  Income  Growth  Partners  L.P.,
IDS/Shurgard Income  Growth Partners  L.P. II,  and IDS/Shurgard  Income  Growth
Partners  L.P.  III  (collectively,  the  "Partnerships")  are  contemplating  a
transaction (the "Merger")  in which  one or more  of the  Partnerships will  be
merged  with and  into Shurgard Storage  Centers, Inc.  ("SSCI"), an affiliated,
publicly traded  real  estate  investment  trust,  pursuant  to  an  acquisition
agreement  (the "Acquisition Agreement")  between the Partnerships  and SSCI. In
the Merger, the limited  partners of the  Partnerships (the "Limited  Partners")
will  be  asked to  approve the  Merger with  SSCI pursuant  to which  they will
receive as consideration newly issued shares of SSCI Class A Common Stock (  the
"Shares")  and, in  the case  of fractional shares,  cash. We  have been further
advised that the Consideration to be received  in the Merger by the partners  of
each  Partnership will be  that number of  Shares and cash  such that the market
value of  the Shares  and cash  will be  equal to  $40,066,700 for  IDS/Shurgard
Income Growth Partners L.P., $26,861,846 for IDS/Shurgard Income Growth Partners
L.P. II, and $39,649,643 for IDS/Shurgard Income Growth Partners L.P. III, which
amounts  represent the estimated net asset value of each Partnership as of March
31, 1996 (collectively, the "Consideration"). To the extent a Partnership's  net
asset  value as of  the closing date of  the Merger exceeds  the net asset value
indicated above, the Partnership will distribute  such excess amount in cash  to
the  partners of such Partnership as soon  as practicable after the closing date
of the Merger. For the purposes of determining the number of Shares to be issued
to each Partnership in the Merger, we have been advised that the market value of
the Shares (the "Share Value")  will be based on  the average per share  closing
prices  on  the  New  York  Stock  Exchange  of  the  Shares  during  the twenty
consecutive trading days ending on the fifth trading day prior to the day of the
meeting of  limited partners  of the  applicable Partnership  on which  day  the
general  partner of such Partnership actually calls  for the vote of the Limited
Partners to approve the Merger, subject  to the condition that such Share  Value
falls within the range of $22.25 to $27.75 per Share (the "Share Value Range").
 
    The  general  partners of  the Partnerships  have  requested that  Robert A.
Stanger & Co., Inc. ("Stanger")  provide its opinion as  to the fairness to  the
Limited  Partners of each  Partnership, from a  financial point of  view, of the
Consideration to be received in the Merger by each respective Partnership.
 
    In the course of  our review to  render this opinion,  we have, among  other
things:
 
    - Reviewed  a draft of (i) the Acquisition Agreement, (ii) Offer to Purchase
      for each Partnership related  to a tender offer  by SSCI for interests  in
      each  Partnership, and (iii) the Proxy Statement/Prospectus related to the
      Merger, which drafts management of the Partnerships has indicated to be in
      substantially the  form  intended  to  be finalized  and  filed  with  the
      Securities and Exchange Commission (the "SEC");
 
                                      C-1
<PAGE>
    - Reviewed the Partnerships' and SSCI's annual reports filed with the SEC on
      Form  10-K for the fiscal  years ending December 31,  1993, 1994 and 1995,
      and quarterly  reports filed  with the  SEC on  Form 10-Q  for the  period
      ending March 31, 1996;
 
    - Reviewed  the SSCI pro forma financial  statements and pro forma schedules
      prepared by the Partnerships' management and SSCI's management;
 
    - Performed appraisals  of  the  portfolios  of  properties  owned  by  each
      Partnership  as of December 31, 1995 (the "Portfolio Valuations") pursuant
      to a  separate  engagement agreement  to  perform such  services  for  the
      Partnerships;
 
    - Reviewed   information  regarding  purchases  and  sales  of  self-storage
      properties by SSCI or  any affiliated entities  during the prior  12-month
      period  and other  information available relating  to acquisition criteria
      for self-storage properties;
 
    - Reviewed  internal  financial  analyses  and  forecasts  prepared  by  the
      Partnerships  of the current net liquidation value of each Partnership and
      projections of going-concern values for each Partnership, which were based
      in part on the Portfolio Valuations;
 
    - Discussed with members of senior  management of the Partnerships and  SSCI
      conditions  in self-storage property markets, conditions in the market for
      sales/acquisitions  of   properties  similar   to  those   owned  by   the
      Partnerships,  current and  projected operations and  performance, and the
      financial condition and future  prospects of the  properties owned by  the
      Partnerships, the Partnerships and SSCI;
 
    - Reviewed  historical market prices, trading  volume and dividends for SSCI
      Common Stock; and
 
    - Conducted other  studies, analyses,  inquiries  and investigations  as  we
      deemed appropriate.
 
    In rendering this fairness opinion, we have relied upon and assumed, without
independent verification, the accuracy and completeness in all material respects
of  all financial and other information contained  in each Offer to Purchase and
the Proxy Statement/Prospectus or that  was furnished or otherwise  communicated
to  us  by the  Partnerships  and SSCI.  We  have not  performed  an independent
appraisal of the non-real estate assets and liabilities of the Partnerships, and
we have relied upon the balance  sheet value determinations and the  adjustments
thereto  made by the general  partners to determine the  net asset value of each
Partnership. We have also relied on  the assurance of the Partnerships and  SSCI
that  the allocation  of the Consideration  within each  Partnership between the
general partner and Limited  Partners is consistent with  the provisions of  the
Partnership  Agreements; that  any pro forma  financial statements, projections,
budgets, estimates of environmental liability, or value estimates or adjustments
contained in  the  Offers to  Purchase  and the  Proxy  Statement/Prospectus  or
otherwise  provided or  communicated to  us, were  reasonably prepared  on bases
consistent with  actual historical  experience and  reflect the  best  currently
available  estimates and  good faith  judgments; that  no material  changes have
occurred in the appraised  value of the properties  or the information  reviewed
between  the  date  of  the  Portfolio  Valuations  or  the  date  of  the other
information provided and the date of this letter; and that the Partnerships  and
SSCI  are not aware of any information or facts that would cause the information
supplied to us to be incomplete or misleading in any material respect.
 
    We have not been requested to, and therefore did not: (i) select the  method
of   determining  the  Consideration  offered  in  the  Merger;  (ii)  make  any
recommendation to  the Limited  Partners  of the  Partnerships with  respect  to
whether  to approve or reject  the Merger, or whether  to select the cash tender
offer made by SSCI  or the Shares  offered in the Merger;  or (iii) express  any
opinion  as to the business  decision to effect the  Merger, alternatives to the
Merger, tax factors resulting from the Merger, the fairness of the Consideration
to be received in  the Merger at  a Share Value  outside of the  low end of  the
Share  Value Range,  the allocation of  expenses associated with  the Merger and
related tender offers between and among the Partnerships and SSCI, or any  terms
of  the Merger other than  the Consideration. Our opinion  is based on business,
economic, real estate and securities markets, and
 
                                      C-2
<PAGE>
other conditions as of the date of our analysis and addresses the Merger in  the
context  of  information  available  as  of the  date  of  our  analysis. Events
occurring after  that  date  may  materially  affect  the  assumptions  used  in
preparing the opinion.
 
    Based  upon and subject to the foregoing, and in reliance thereon, it is our
opinion that as of the date of  this letter the Consideration to be received  in
the  Merger by  the Limited  Partners is  fair to  the Limited  Partners of each
respective Partnership from a financial point of view.
 
    The preparation  of a  fairness opinion  is  a complex  process and  is  not
necessarily  susceptible  to partial  analysis or  summary description.  We have
advised each of the Partnerships that our entire analysis must be considered  as
a  whole and that selecting portions of  our analysis and the factors considered
by us, without considering  all analyses and facts,  could create an  incomplete
view of the evaluation process underlying this opinion.
 
Yours truly,
Robert A. Stanger & Co., Inc.
Shrewsbury, NJ
July 1, 1996
 
                                      C-3
<PAGE>
                                                                      APPENDIX D
 
                                     [LOGO]
                                  July 1, 1996
 
Special Committee of the Board of Directors
  of Shurgard Storage Centers, Inc.
c/o Latham & Watkins
650 Town Center Drive, 20th Floor
Costa Mesa, California 92626-1925
 
Dear Sirs:
 
    We  understand that Shurgard  Storage Centers, Inc.  (the "Company") and IDS
Shurgard Income  Growth  Partners L.P.  ("IDS  I"), IDS/Shurgard  Income  Growth
Partners  L.P. II ("IDS II")  and IDS/ Shurgard Income  Growth Partners L.P. III
("IDS III"; each of IDS I, IDS II and IDS III may be referred to separately as a
"Partnership" or collectively  as the  "Partnerships") intend to  enter into  an
Acquisition  Agreement  (the "Agreement")  pursuant  to which  the  Company will
commence a cash tender offer  for (i) up to 65,000  of the outstanding units  of
limited  partnership of  IDS I, (ii)  up to  49,000 of the  outstanding units of
limited partnership of IDS II, and (iii)  up to 52,000 of the outstanding  units
of  limited partnership  of IDS  III (collectively,  the "Tender  Offers"). Upon
completion of the Tender Offers and if certain conditions have been satisfied or
waived, including the receipt  of requisite approval by  the holders of  limited
partnership  units of each Partnership, each Partnership will be merged with and
into the  Company  (the  "Mergers")  and the  general  and  limited  partnership
interests  in each  of the  Partnerships will be  converted into  that number of
shares of Class A Common Stock, par  value $.001 per share ("Common Stock"),  of
the  Company obtained  by dividing (i)  the Net  Asset Value (as  defined in the
Agreement) of the respective Partnerships allocable to such interests by (ii)  a
20  trading day average of the per share  closing prices for the Common Stock on
the New York  Stock Exchange (subject  to a  minimum and maximum  of $22.25  and
$27.75, respectively). You have requested our opinion, as investment bankers, as
to the fairness, from a financial point of view, of the consideration to be paid
in connection with the Tender Offers and the Mergers.
 
    Alex.  Brown & Sons Incorporated ("Alex. Brown"), as a customary part of its
investment banking business, is engaged in the valuation of businesses and their
securities   in   connection   with   mergers   and   acquisitions,   negotiated
underwritings, private placements and valuations for estate, corporate and other
purposes.  We have acted  as financial advisor  to the Special  Committee of the
Board of Directors in connection with the Tender Offers and the Mergers and have
received a fee for our services. We have also acted as a managing underwriter of
a past offering of the Common Stock and advised a special committee of the Board
of Directors of  the Company  regarding its merger  with Shurgard  Incorporated.
Alex.  Brown regularly publishes research reports  regarding the real estate and
real estate investment  trust industries  and the businesses  and securities  of
publicly  owned companies  in those  industries. In  the ordinary  course of our
business, we may  actively trade the  Common Stock  of the Company  for our  own
account  and for the account of our  customers and, accordingly, may at any time
hold a long or short position in the Company's Common Stock.
 
    In connection with our  opinion, we have reviewed  drafts of the  Agreement,
the  Offer to Purchase and the Registration Statement of the Company on Form S-4
(the "Registration  Statement")  with  respect  to the  Tender  Offers  and  the
Mergers,    as   well   as   certain    publicly   available   information   and
 
                                      D-1
<PAGE>
certain internal financial and other information furnished to us by the  Company
and  the Partnerships. We have also held  discussions with members of the senior
management of the Company  and a general partner  of each Partnership's  general
partner   regarding  the  business   and  prospects  of   the  Company  and  the
Partnerships. In addition, we have (i)  reviewed the reported price and  trading
activity  for the Common Stock and each Partnership's limited partnership units,
(ii) compared certain financial  and stock market  information for certain  real
estate  companies  whose  securities  are publicly  traded,  (iii)  reviewed the
financial terms  of  certain  recent acquisitions  in  the  public  self-storage
industry  and (iv) performed such other studies and analyses and considered such
other factors as we deemed appropriate.
 
    In conducting our review and in rendering our opinion, we have assumed  that
the definitive Agreement, Offer to Purchase and Registration Statement will not,
when  executed or filed, as the case may be, differ in any material respect from
the drafts thereof which  we have reviewed. We  have not independently  verified
the  information described above  and for purposes of  this opinion have assumed
the accuracy, completeness  and fairness  thereof. With  respect to  information
relating  to the prospects of the Company  and the Partnerships, we have assumed
that such  information  reflects  the best  currently  available  estimates  and
judgments  of the Company's management  and of a general  partner of each of the
Partnership's general partner as to  the likely future financial performance  of
the  Company and the Partnerships. In addition,  we have not made or obtained an
independent evaluation  of  the  assets  of  the  Company,  the  assets  of  the
Partnerships  or  reviewed environmental  issues  relating to  the  Company, the
Partnerships, the Tender Offers or the Mergers. Our opinion is based on  market,
economic  and other conditions as they exist and can be evaluated as of the date
of this letter.
 
    Based upon and  subject to the  foregoing, it is  our opinion as  investment
bankers that, as of the date of this letter, the consideration to be paid by the
Company  in each of the Tender Offers and  the Mergers is fair, from a financial
point of view, to the Company.
 
                                          Very truly yours,
 
                                          Alex. Brown & Sons Incorporated
 
                                      D-2
<PAGE>
                                   APPENDIX E
                   WASHINGTON UNIFORM LIMITED PARTNERSHIP ACT
                         (RCW TITLE 25.10, ARTICLE 14)
                               DISSENTERS' RIGHTS
 
25.10.900  DEFINITIONS.
 
    As used in this article:
 
    (1)  "Limited partnership" means  the domestic limited  partnership in which
the dissenter holds  or held a  partnership interest, or  the surviving  limited
partnership  or  corporation by  merger, whether  foreign  or domestic,  of that
limited partnership.
 
    (2) "Dissenter" means a partner  who is entitled to  dissent from a plan  of
merger  and who  exercises that right  when and  in the manner  required by this
article.
 
    (3) "Fair value," with respect to a dissenter's partnership interest,  means
the value of the partnership interest immediately before the effectuation of the
merger   to  which  the   dissenter  objects,  excluding   any  appreciation  or
depreciation  in  anticipation   of  the  merger   unless  exclusion  would   be
inequitable.
 
    (4)  "Interest" means interest  from the effective date  of the merger until
the date  of  payment,  at  the  average rate  currently  paid  by  the  limited
partnership  on its principal bank loans or, if none, at a rate that is fair and
equitable under all the circumstances.
 
25.10.905  PARTNER -- DISSENT -- PAYMENT OF FAIR VALUE.
 
    (1) Except as  provided in  RCW 25.10.915 or  25.10.925(2), a  partner of  a
domestic limited partnership is entitled to dissent from, and obtain payment of,
the   fair  value  of  the  partner's  partnership  interest  in  the  event  of
consummation of a plan of merger to which the limited partnership is a party  as
permitted by RCW 25.10.800 or 25.10.840.
 
    (2)  A  partner entitled  to dissent  and obtain  payment for  the partner's
partnership interest under this  article may not  challenge the merger  creating
the  partner's entitlement unless the merger fails to comply with the procedural
requirements imposed by this title, Title 23B RCW, the partnership agreement, or
is fraudulent with respect to the partner or the limited partnership.
 
    (3) The right of a dissenting partner to obtain payment of the fair value of
the partner's partnership interest  shall terminate upon  the occurrence of  any
one of the following events:
 
        (a) The proposed merger is abandoned or rescinded;
 
        (b)  A court having  jurisdiction permanently enjoins  or sets aside the
    merger; or
 
        (c) The  partner's demand  for  payment is  withdrawn with  the  written
    consent of the limited partnership.
 
25.10.910  DISSENTERS' RIGHTS -- NOTICE -- TIMING.
 
    (1)  Not less than ten days  prior to the approval of  a plan of merger, the
limited partnership must send a written notice to all partners who are  entitled
to  vote on or  approve the plan of  merger that they may  be entitled to assert
dissenters' rights under  this article. Such  notice shall be  accompanied by  a
copy of this article.
 
    (2)  The  limited  partnership  shall notify  in  writing  all  partners not
entitled to vote on or  approve the plan of merger  that the plan of merger  was
approved, and send them the dissenters' notice as required by RCW 25.10.920.
 
                                      E-1
<PAGE>
25.10.915  PARTNER -- DISSENT -- VOTING RESTRICTION.
 
    A  partner who is entitled to vote on  or approve the plan of merger and who
wishes to assert dissenters'  rights must not  vote in favor  of or approve  the
plan  of merger. A partner who does not satisfy the requirements of this section
is not entitled to payment for the partner's interest under this article.
 
25.10.920  PARTNERS -- DISSENTERS' NOTICE -- REQUIREMENTS.
 
    (1) If the plan of merger is approved, the limited partnership shall deliver
a written dissenters' notice to all  partners who satisfied the requirements  of
RCW 25.10.915.
 
    (2) The dissenters' notice required by RCW 25.10.910(2) or by subsection (1)
of  this section must be sent within ten  days after the approval of the plan of
merger, and must:
 
        (a) State where the payment demand must be sent;
 
        (b) Inform holders of the partnership interest as to the extent transfer
    of the partnership interest will be restricted as permitted by RCW 25.10.930
    after the payment demand is received;
 
        (c) Supply a form for demanding payment;
 
        (d) Set a date by which the limited partnership must receive the payment
    demand, which date may  not be fewer  than thirty nor  more than sixty  days
    after the date the notice under this section is delivered; and
 
        (e) Be accompanied by a copy of this article.
 
25.10.925  PARTNER -- PAYMENT DEMAND -- ENTITLEMENT.
 
    (1)  A partner  who demands  payment retains all  other rights  of a partner
until the proposed merger becomes effective.
 
    (2) A partner sent a dissenters' notice  who does not demand payment by  the
date  set in the dissenters' notice is not entitled to payment for the partner's
partnership interest under this article.
 
25.10.930  PARTNERSHIP INTERESTS -- TRANSFER RESTRICTIONS.
 
    The limited partnership may restrict  the transfer of partnership  interests
from the date the demand for their payment is received until the proposed merger
becomes effective or the restriction is released under this article.
 
25.10.935  PAYMENT OF FAIR VALUE -- REQUIREMENTS FOR COMPLIANCE.
 
    (1)  Within thirty days of the later of the date the proposed merger becomes
effective, or the payment demand is received, the limited partnership shall  pay
each   dissenter  who  complied  with  RCW  25.10.925  the  amount  the  limited
partnership estimates to  be the fair  value of the  partnership interest,  plus
accrued interest.
 
    (2) The payment must be accompanied by:
 
        (a)  Copies of the financial statements  for the most recent fiscal year
    maintained as required by RCW 25.10.050;
 
        (b) An explanation  of how  the limited partnership  estimated the  fair
    value of the partnership interest;
 
        (c) An explanation of how the accrued interest was calculated;
 
        (d) A statement of the dissenter's right to demand payment; and
 
        (e) A copy of this article.
 
                                      E-2
<PAGE>
25.10.940  MERGER -- NOT EFFECTIVE WITHIN SIXTY DAYS -- TRANSFER RESTRICTIONS.
 
    (1) If the proposed merger does not become effective within sixty days after
the  date set for  demanding payment, the limited  partnership shall release any
transfer restrictions imposed as permitted by RCW 25.10.930.
 
    (2) If, after releasing transfer  restrictions, the proposed merger  becomes
effective,  the  limited  partnership  must send  a  new  dissenters'  notice as
provided in  RCW  25.10.910(2)  and  25.10.920 and  repeat  the  payment  demand
procedure.
 
25.10.945  DISSENTER'S ESTIMATE OF FAIR VALUE -- NOTICE.
 
    (1)  A  dissenter  may notify  the  limited  partnership in  writing  of the
dissenter's own  estimate  of the  fair  value of  the  dissenter's  partnership
interest  and  amount of  interest due,  and demand  payment of  the dissenter's
estimate, less any payment under RCW 25.10.935, if:
 
        (a) The dissenter believes  that the amount paid  is less than the  fair
    value  of the dissenter's  partnership interest or that  the interest due is
    incorrectly calculated;
 
        (b) The  limited partnership  fails to  make payment  within sixty  days
    after the date set for demanding payment; or,
 
        (c)  The limited partnership,  having failed to  effectuate the proposed
    merger, does not  release the transfer  restrictions imposed on  partnership
    interests as permitted by RCW 25.10.930 within sixty days after the date set
    for demanding payment.
 
    (2) A dissenter waives the right to demand payment under this section unless
the  dissenter notifies  the limited  partnership of  the dissenter's  demand in
writing under  subsection (1)  of  this section  within  thirty days  after  the
limited partnership made payment for the dissenter's partnership interest.
 
25.10.950  UNSETTLED DEMAND FOR PAYMENT -- PROCEEDING -- PARTIES -- APPRAISERS.
 
    (1)  If  a demand  for payment  under RCW  25.10.945 remains  unsettled, the
limited  partnership  shall  commence  a  proceeding  within  sixty  days  after
receiving  the payment demand and petition the court to determine the fair value
of the partnership  interest and  accrued interest. If  the limited  partnership
does  not commence the proceeding within the sixty-day period, it shall pay each
dissenter whose demand remains unsettled the amount demanded.
 
    (2) The limited partnership  shall commence the  proceeding in the  superior
court.  If the limited  partnership is a domestic  limited partnership, it shall
commence the proceeding in the county where its office is maintained as required
by RCW 25.10.040(1). If  the limited partnership is  a domestic corporation,  it
shall  commence  the proceeding  in the  county where  its principal  office, as
defined in RCW  23B.01.400(17), is located,  or if  none is in  this state,  its
registered  office under RCW 23B.05.010. If the limited partnership is a foreign
limited partnership or corporation without a registered office in this state, it
shall commence the proceeding in  the county in this  state where the office  of
the  domestic limited partnership maintained pursuant to RCW 25.10.040(1) merged
with the foreign limited partnership or foreign corporation was located.
 
    (3) The  limited  partnership shall  make  all dissenters  (whether  or  not
residents  of  this  state)  whose  demands  remain  unsettled  parties  to  the
proceeding as in an action against  their partnership interests and all  parties
must  be  served with  a copy  of the  petition. Nonresidents  may be  served by
registered or certified mail or by publication as provided by law.
 
    (4) The  limited partnership  may join  as  a party  to the  proceeding  any
partner  who claims to  be a dissenter  but who has  not, in the  opinion of the
limited partnership, complied with the provisions of this chapter. If the  court
determines  that  such partner  has  not complied  with  the provisions  of this
article, the partner shall be dismissed as a party.
 
                                      E-3
<PAGE>
    (5) The jurisdiction of  the court in which  the proceeding is commenced  is
plenary  and exclusive. The court may appoint  one or more persons as appraisers
to receive evidence and recommend decisions  on the question of fair value.  The
appraisers  have the  powers described  in the order  appointing them  or in any
amendment to it.  The dissenters are  entitled to the  same discovery rights  as
parties in other civil proceedings.
 
    (6)  Each dissenter made a  party to the proceeding  is entitled to judgment
for the  amount,  if any,  by  which  the court  finds  the fair  value  of  the
dissenter's  partnership interest, plus interest, exceeds the amount paid by the
limited partnership.
 
25.10.955  UNSETTLED DEMAND FOR PAYMENT -- COSTS -- FEES AND EXPENSES OF
COUNSEL.
 
    (1) The court in a proceeding commenced under RCW 25.10.950 shall  determine
all  costs of the proceeding, including the reasonable compensation and expenses
of appraisers appointed by the court.  The court shall assess the costs  against
the  limited partnership, except that the court may assess the costs against all
or some of the dissenters, in amounts  the court finds equitable, to the  extent
the  court finds the  dissenters acted arbitrarily, vexatiously,  or not in good
faith in demanding payment.
 
    (2) The court may also assess the  fees and expenses of counsel and  experts
for the respective parties, in amounts the court finds equitable:
 
        (a)  Against  the  limited  partnership  and  in  favor  of  any  or all
    dissenters if the court finds the limited partnership did not  substantially
    comply with the requirements of this article; or
 
        (b)  Against either the limited partnership  or a dissenter, in favor of
    any other party, if the court finds that the party against whom the fees and
    expenses are assessed acted arbitrarily,  vexatiously, or not in good  faith
    with respect to the rights provided by this article.
 
        (3)  If the court finds  that the services of  counsel for any dissenter
    were of substantial benefit to other dissenters similarly situated, and that
    the fees  for those  services should  not be  assessed against  the  limited
    partnership, the court may award to these counsel reasonable fees to be paid
    out of the amounts awarded the dissenters who were benefited.
 
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