IRON MOUNTAIN INC /DE
S-4, 1998-01-13
PUBLIC WAREHOUSING & STORAGE
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    As filed with the Securities and Exchange Commission on January 13, 1998
                                                          Registration No. 333-

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                              --------------------

                                    FORM S-4
             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                              ---------------------
                           IRON MOUNTAIN INCORPORATED
             (Exact name of registrant as specified in its charter)

    DELAWARE                         4226                        04-3107342
(State or other         (primary standard Industrial         (I.R.S. Employer
jurisdiction of         classification code number)      Identification Number)
incorporation or 
organization)

                      745 ATLANTIC AVENUE, BOSTON, MA 02111
                                 (617) 357-4455
    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)
                              --------------------
                                C. Richard Reese
                            Chairman of The Board of
                      Directors and Chief Executive Officer
                           Iron Mountain Incorporated
                               745 Atlantic Avenue
                                Boston, MA 02111
                                 (617) 357-4455
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                              --------------------
                                    Copy to:
                           Susan Forest Barrett, Esq.
                            Sullivan & Worcester LLP
                             One Post Office Square
                                Boston, MA 02109
                                 (617) 338-2800

         Approximate  date of commencement of proposed sale to the public:  From
time to time as soon as practicable  after this  Registration  Statement becomes
effective.
         If the  securities  being  registered on this Form are being offered in
connection  with the formation of a holding company and there is compliance with
General Instruction G, check the following box. |_|
         If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the  Securities  Act,  check the following box and
list the Securities Act registration  statement number of the earlier  effective
registration statement for the same offering. |_|
         If this  form is a  post-effective  amendment  filed  pursuant  to Rule
462(d) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. |_|

<TABLE>
<CAPTION>
                                                   CALCULATION OF REGISTRATION FEE


====================================================================================================================================
Title of Each Class of Securities to  Amount to be           Proposed Maximum              Proposed Maximum            Amount of
          be Registered                Registered      Offering Price Per Share(1)   Aggregate Offering Price(1)   Registration Fee
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>                <C>                           <C>                          <C>
          Common Stock,                 1,000,000                  $35.50                       $ 35,500,000             $10,472.50
     Par Value $.01 per share
====================================================================================================================================

<FN>
     (1)  The shares are to be offered at prices not presently determinable.  The offering price is estimated solely for the purpose
          of  calculating  the  registration  fee pursuant to Rule 457(c) under the  Securities  act of 1933, as amended,  using the
          average high and low prices reported on the Nasdaq National Market on January 8, 1998.
</FN>
</TABLE>

                             ----------------------
    The  Registrant  hereby amends this  Registration  Statement on such date or
dates as may be necessary to delay its effective date until the Registrant  will
file a  further  amendment  which  specifically  states  that  the  Registration
Statement will  thereafter  become  effective in accordance with Section 8(a) of
the Securities Act of 1933, as amended, or until the Registration Statement will
become effective on such date as the Securities and Exchange Commission,  acting
pursuant to Section 8(a), may determine.


<PAGE>
Information   contained  herein  is  subject  to  completion  or  amendment.   A
registration  statement  relating  to these  securities  has been filed with the
Securities  and Exchange  Commission.  These  securities may not be sold nor may
offers to buy be accepted prior to the time the registration  statement  becomes
effective.  This  prospectus  shall  not  constitute  an  offer  to  sell or the
solicitation of an offer to buy nor shall there by any sale of these  securities
in any State in which such offer,  solicitation  or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.

                              Subject to Completion
                  Preliminary Prospectus Dated January 13, 1998

PROSPECTUS

                                1,000,000 Shares
                           Iron Mountain Incorporated
                                  Common Stock
                             ----------------------

     This Prospectus  relates to the issuance from time to time by Iron Mountain
Incorporated (the "Company" or "Iron Mountain"), a Delaware corporation,  of its
shares of common  stock,  par value $.01 per share (the "Common  Stock"),  in an
aggregate amount of up to 1,000,000  shares,  upon terms to be determined at the
time of each such offering.

     The Common  Stock is to be offered  directly by the  Company in  connection
with the  acquisition  of the  assets of, or  ownership  interests  in,  certain
entities  engaged in the same or similar lines of business as the Company or any
of its  subsidiaries.  The consideration for acquisitions will consist of shares
of Common Stock,  cash,  notes or other evidences of  indebtedness,  guarantees,
assumption of  liabilities,  tangible or intangible  property,  or a combination
thereof, as determined from time to time by negotiations between the Company and
the owners or  controlling  persons of the assets or  ownership  interests to be
acquired.  In  addition,  the  Company  may lease  property  from and enter into
management or consulting  agreements  and  non-competition  agreements  with the
former owners and key executive personnel of the businesses to be acquired.

     The  Company  contemplates  that  the  terms  of  an  acquisition  will  be
determined by negotiations between the Company's  representatives and the owners
or  controlling  persons of the assets or  ownership  interests  to be acquired.
Factors  taken into  account  in  acquisitions  include,  among  other  relevant
factors,  the quality and reputation of the business,  the assets,  liabilities,
results  of  operations  and cash  flows for the  business,  the  quality of its
management and employees,  its earnings potential,  the geographic  locations of
the  business  and the market  value of the  Common  Stock of the  Company  when
pertinent.  The Company  anticipates  that shares of Common  Stock issued in any
such  acquisition  will be valued at a price  reasonably  related  to the market
value of the Common Stock,  either at the time the terms of the acquisitions are
tentatively  agreed  upon,  or at or about the time of  closing,  or during  the
period or periods prior to delivery of the shares.

     The Company does not expect that underwriting discounts or commissions will
be paid,  except that  finders  fees may be paid to persons from time to time in
connection with specific acquisitions. Any person receiving any such fees may be
deemed to be an underwriter within the meaning of the Securities Act of 1933, as
amended (the "Securities Act").

         The Common Stock is traded on the Nasdaq  National  Market System under
the symbol "IMTN." On January 8, 1998 the closing sale price of the Common Stock
on the Nasdaq National Market System was $35.50 per share.
                             ----------------------
     See  "RISK  FACTORS"  at page 6 for  certain  information  that  should  be
considered by prospective investors.

    THESE SECURITIES 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 COM-
        MISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
            ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                             ----------------------



              The date of this Prospectus is ______________, 1998.

                                                         

<PAGE>
                              AVAILABLE INFORMATION

     The Company has filed with the  Securities  and  Exchange  Commission  (the
"Commission")  in  Washington,  D.C.,  a  registration  statement  on  Form  S-4
(together with all exhibits, schedules and amendments thereto, the "Registration
Statement")  under the  Securities  Act, with respect to the Common Stock.  This
Prospectus,  which is a part of the Registration Statement, does not contain all
of the information set forth in the Registration  Statement.  Statements in this
Prospectus  as to the  contents  of any  contract  or  other  document  are  not
necessarily complete, and in each instance reference is made to the copy of such
contract or other documents filed as an exhibit to the  Registration  Statement,
each such  statement  being  qualified in all respects by such reference and the
exhibits and schedules thereto.  For further information  concerning the Company
and the Common Stock, reference is made to the Registration Statement. Copies of
the Registration  Statement may be obtained from the Commission at its principal
office in Washington, D.C. upon payment of the prescribed fee.

     The Company is subject to the informational  requirements of the Securities
Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  and, in  accordance
therewith,  files  reports  and  other  information  with  the  Commission.  The
Registration  Statement,  the exhibits and schedules  forming a part thereof and
the reports,  proxy statements and other  information  filed by the Company with
the  Commission  can be inspected  and copies  obtained at the public  reference
facilities maintained by the Commission at Judiciary Plaza, Room 1024, 450 Fifth
Street, N.W.,  Washington,  D.C. 20549, and at the following regional offices of
the Commission:  Chicago Regional  Office,  Suite 1400, 500 West Madison Street,
Chicago,  Illinois  60661-2511;  and New York Regional Office, Seven World Trade
Center,  New York,  New York 10048.  Copies of such  material can be obtained at
prescribed  rates from the Public  Reference  Section of the  Commission  at its
principal  office  at 450  Fifth  Street,  N.W.,  Washington,  D.C.  20549.  The
Commission  maintains  a World Wide Web site that  contains  reports,  proxy and
information  statements and other information regarding  registrants,  including
the Company,  that file electronically  with the Commission.  The address of the
site is  http://www.sec.gov.  In addition,  reports,  proxy statements and other
information  concerning  the Company may be  inspected  at the offices of Nasdaq
operations, 1735 K Street N.W., Washington, D.C. 20006.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The  following  documents,  which have been filed by Iron Mountain with the
Commission  (file  no.  0-27584)  pursuant  to  the  Exchange  Act,  are  hereby
incorporated  in  this  Prospectus  and  specifically  made  a  part  hereof  by
reference: (i) Annual Report on Form 10-K for the fiscal year ended December 31,
1996 (the "Annual Report"), (ii) Quarterly Reports on Form 10-Q for the quarters
ended March 31,  1997,  June 30, 1997 and  September  30,  1997,  (iii)  Current
Reports on Form 8-K dated June 25, 1997 (as amended August 26, 1997), October 1,
1997,  October  16, 1997 (as  amended  November  10,  1997),  October 30,  1997,
November 25, 1997 and January 13, 1998,  and (iv) the  description of the Common
Stock  contained  in the  Company's  Registration  Statement  on Form 8-A  dated
January 18,  1996.  In addition,  the  financial  information  contained in Iron
Mountain's  Registration  Statements on Form S-4 (i) File No.  333-24635,  filed
with the  Commission  on April 4,  1997,  as  amended on May 7, 1997 and May 13,
1997, as made  effective by the  Commission  on May 14, 1997,  and (ii) file no.
333-41715,  filed with the  Commission on December 8, 1997, as made effective by
the  Commission on December 11, 1997 is  incorporated  herein by reference.  All
documents filed by Iron Mountain  pursuant to Section 13(a),  13(c), 14 or 15(d)
of the Exchange Act subsequent to the date of the initial Registration Statement
and prior to the  effectiveness of the Registration  Statement and subsequent to
the date of this  Prospectus and prior to the termination of the offering of the
Common  Stock  shall  be  deemed  to  be  incorporated  by  reference  into  the
Registration  Statement  and to be a part  hereof from the  respective  dates of
filing of any such documents.

     Any statement  contained herein or in a document  incorporated or deemed to
be incorporated herein by reference shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement  contained herein
(or in the applicable Prospectus Supplement), or in any other subsequently filed
document  that  also is or is  deemed to be  incorporated  herein by  reference,
modifies or supersedes such statement.

                                        2

<PAGE>
Any such statement so modified or superseded  shall not be deemed,  except as so
modified or superseded, to constitute a part of this Prospectus.

     The Company hereby  undertakes to provide  without charge to each person to
whom this  Prospectus  is  delivered,  upon the written or oral  request of such
person, a copy of any and all of the information  that has been  incorporated by
reference  in this  Prospectus  (excluding  exhibits  unless such  exhibits  are
specifically incorporated by reference into the information that this Prospectus
incorporates).  Requests  for such  copies  should be made to the Company at its
principal executive offices, 745 Atlantic Avenue,  Boston,  Massachusetts 02111,
Attention:  John F. Kenny,  Jr.,  Executive Vice  President and Chief  Financial
Officer.


                                   THE COMPANY

     Iron Mountain is America's largest records management  company, as measured
by its  revenues.  The Company is a national,  full-service  provider of records
management  and  related  services,  enabling  customers  to  outsource  records
management  functions.  Iron Mountain has a  diversified  customer  base,  which
includes  more than half of the  Fortune  500 and  numerous  commercial,  legal,
banking,  healthcare,   accounting,  insurance,   entertainment  and  government
organizations.  The Company  provides storage and related services for all major
media, including paper (the dominant form of record storage),  computer disk and
tapes, microfilm and microfiche,  master audio and video tapes, film and optical
disks, X-rays and blueprints. Iron Mountain's principal services provided to its
storage  customers include courier pick-up and delivery,  filing,  retrieval and
destruction of records,  database management,  customized reporting and disaster
recovery  support.  The  Company  also  sells  storage  materials  and  provides
consulting,  facilities  management,  information  technology staffing and other
outsourcing services.

     Iron  Mountain  was  incorporated  in Delaware in 1990 but its  predecessor
operations date from 1951. The principal  executive  officers of the Company are
located at 745 Atlantic  Avenue,  Boston,  Massachusetts  02111.  Its  telephone
number is (617) 357-4455.


                                        3

<PAGE>
            SELECTED CONSOLIDATED FINANCIAL AND OPERATING INFORMATION
                    (In thousands, except per share amounts)

     The following  selected  consolidated  statements of operations and balance
sheet data of the  Company as of and for each of the years  ended  December  31,
1992,  1993,  1994,  1995 and 1996 have been derived from the Company's  audited
consolidated  financial  statements.  The selected  consolidated  statements  of
operations  and balance  sheet data of the  Company  for the nine  months  ended
September  30,  1996 and 1997 have been  derived  from the  Company's  unaudited
condensed consolidated  financial statements.  The Company's unaudited condensed
consolidated financial statements include all adjustments,  consisting of normal
recurring accruals, that the Company considers necessary for a fair presentation
of the  financial  position  and the results of  operations  for those  periods.
Operating  results  for  the  nine  months  ended  September  30,  1997  are not
necessarily  indicative  of the results for the entire year ending  December 31,
1997. The selected  consolidated  financial and operating  information set forth
below should be read in conjunction with Iron Mountain's  Consolidated Financial
Statements  and  the  Notes  thereto   incorporated  by  reference  herein.  See
"Incorporation of Certain Documents by Reference."

<TABLE>
<CAPTION>
                                                                                                   Nine Months
                                                         Year Ended December 31,               Ended September 30,
                                             -----------------------------------------------   ------------------
                                               1992     1993     1994      1995      1996       1996      1997
                                             --------  -------  -------  --------- ---------   -------  ---------
Consolidated Statements of Operations Data:
Revenues:
<S>                                          <C>       <C>      <C>      <C>       <C>         <C>      <C>
   Storage.................................   $44,077  $48,892  $54,098  $  64,165  $ 85,826   $61,419  $  86,199
   Service and Storage Material Sales......    26,596   32,781   33,520     40,271    52,892    38,550     57,195
                                             --------  -------  -------  --------- ---------   -------  ---------
        Total Revenues.....................    70,673   81,673   87,618    104,436   138,718    99,969    143,394
Operating Expenses:
   Cost of Sales (Excluding Depreciation)..    35,169   43,054   45,880     52,277    70,747    51,091     73,742
   Selling, General and Administrative.....    17,630   19,971   20,853     26,035    34,342    24,762     35,682
   Depreciation and Amortization...........     5,780    6,789    8,690     12,341    16,936    11,896     18,495
                                             --------  -------  -------  --------- ---------   -------  ---------
        Total Operating Expenses...........    58,579   69,814   75,423     90,653   122,025    87,749    127,919
                                             --------  -------  -------  --------- ---------   -------  ---------
Operating Income...........................    12,094   11,859   12,195     13,783    16,693    12,220     15,475
Interest Expense...........................     8,412    8,203    8,954     11,838    14,901     9,981     17,631
                                             --------  -------  -------  --------- ---------   -------  ---------
Income (Loss) Before Provision (Credit) for
   Income Taxes............................     3,682    3,656    3,241      1,945     1,792     2,239     (2,156)
Provision (Credit) for Income Taxes........     2,095    2,088    1,957      1,697     1,435     1,542       (346)
                                             --------  -------  -------  --------- ---------   -------  ---------
Income (Loss) Before Extraordinary Charge..     1,587    1,568    1,284        248       357       697     (1,810)
Extraordinary Charge, Net of Tax Benefit (1)       --       --       --         --     2,216        --         --
                                             --------  -------  -------  --------- ---------   -------  ---------
Net Income (Loss)..........................     1,587    1,568    1,284        248    (1,769)      697     (1,810)
Accretion of Redeemable Put Warrant........       626      940    1,412      2,107       280       280         --
                                             --------  -------  -------  --------- ---------   -------  ---------
Net Income (Loss) Applicable to Common  
   Stockholders............................   $    961 $   628  $  (128) $  (1,859) $ (2,049)  $   417  $  (1,810)
                                             ========  =======  =======  ========= =========   =======  =========
Income (Loss) Before Extraordinary Item per
   Common and Common Equivalent Share......   $  0.12  $  0.08  $ (0.02) $   (0.24) $   0.01   $  0.04  $   (0.17)
Net Income (Loss) per Common and Common
   Equivalent Share........................   $  0.12  $  0.08  $ (0.02) $   (0.24) $  (0.20)  $  0.04  $   (0.17)
Weighted Average Common and Common
   Equivalent Shares Outstanding...........     8,052    8,067    7,984      7,784    10,137    10,101     10,906

Other Data:
EBITDA (2).................................   $17,874  $18,648  $20,885  $  26,124  $ 33,629   $24,116  $  33,970
EBITDA as a Percentage of Total Revenues...      25.3 %   22.8 %   23.8 %     25.0%     24.2%     24.1 %     23.7%
Capital Expenditures:
   Growth (3)(4)...........................   $11,226  $13,605  $15,829  $  14,395  $ 23,334   $16,610  $  20,074
   Maintenance.............................       818    1,846    1,151        858     1,112       803        544
                                             --------  -------  -------  --------- ---------   -------  ---------
Total Capital Expenditures (4).............   $12,044  $15,451  $16,980  $  15,253  $ 24,446   $17,413  $  20,618
                                             ========  =======  =======  ========= =========   =======  =========
Additions to Customer Acquisition Costs....   $ 1,268  $   922  $ 1,366  $   1,379  $  1,642   $ 1,265  $     688

(continued on next page)

                                                         4
<PAGE>






<CAPTION>
                                                            As of December 31,                    As of
                                             -----------------------------------------------   September 30,
                                                1992     1993      1994     1995      1996         1997
                                             --------- --------  --------  -------  --------     ---------
Consolidated Balance Sheet Data:
<S>                                           <C>       <C>      <C>       <C>      <C>           <C>     
Cash and Cash Equivalents..................   $    498  $   591  $  1,303  $ 1,585  $  3,453      $  2,242
Total Assets...............................    115,429  125,288   136,859  186,881   281,799       451,099
Total Debt.................................     73,304   78,460    86,258  121,874   184,733       274,368
Stockholders' Equity.......................     23,419   24,047    22,869   21,011    52,384       113,945
- ---------------

<FN>
(footnotes from the preceding page)
(1) The  extraordinary  charge for 1996  consists of a prepayment  penalty,  the
    write-off of deferred  financing costs,  original issue discount and loss on
    termination of interest rate protection agreements.
(2) Based on its  experience  in the records  management  industry,  the Company
    believes that earnings before interest,  taxes,  depreciation,  amortization
    and  extraordinary  items  ("EBITDA") is an important tool for measuring the
    performance of records management companies (including potential acquisition
    targets) in several  areas,  such as liquidity,  operating  performance  and
    leverage.  In  addition,  lenders  use EBITDA as a criterion  in  evaluating
    records  management  companies,  and  substantially  all  of  the  Company's
    financing  agreements contain covenants in which EBITDA is used as a measure
    of  financial  performance.  However,  EBITDA  should not be  considered  an
    alternative  to operating or net income (as  determined in  accordance  with
    GAAP) as an  indicator  of the  Company's  performance  or to cash flow from
    operations  (as  determined  in  accordance  with  GAAP)  as  a  measure  of
    liquidity.
(3) Growth capital  expenditures  include  investments in racking  systems,  new
    buildings  and  leasehold   improvements,   equipment  for  new  facilities,
    management information systems and facilities restructuring.
(4) Includes  $2,901  in 1994  related  to the cost of  constructing  a  records
    management  facility which was sold in a  sale-leaseback  transaction in the
    fourth quarter of 1994.
</FN>
</TABLE>


                                        5
<PAGE>
                                  RISK FACTORS


         Investors  should  carefully  consider the following  risk factors,  in
addition  to  the  other  information  contained  in  this  Prospectus  and  any
Prospectus  Supplement,   before  purchasing  any  of  the  Common  Stock.  This
Prospectus sets forth or incorporates  by reference  forward-looking  statements
within the meaning of Section 27A of the Securities Act, such as those regarding
the  goals,  beliefs,  plans or  current  expectations  of the  Company  and its
management and other statements  contained in this Prospectus  regarding matters
that are not historical facts. Because such  forward-looking  statements include
risks and  uncertainties,  actual  results  may  differ  materially  from  those
expressed in or implied by such forward-looking  statements.  Factors that could
cause actual results to differ materially  include,  but are not limited to, the
risk  factors  set forth  below and the  matters  set forth or  incorporated  by
reference  in this  Prospectus  generally  and any  Prospectus  Supplement.  The
Company  undertakes  no  obligation  to  release  publicly  the  results  of any
revisions to these forward-looking statements that may be made to reflect future
events or circumstances or to reflect unanticipated events.

Risks Associated with Acquisition Strategy

         Iron   Mountain   has   pursued  and  intends  to  continue  to  pursue
acquisitions  of records  management  and related  service  businesses  as a key
component of its growth  strategy.  Certain risks are inherent in an acquisition
strategy,  such  as  increasing  leverage  and  debt  service  requirements  and
combining  disparate  company  cultures and  facilities,  which could  adversely
affect  Iron  Mountain's   operating  results.  The  success  of  any  completed
acquisition  will  depend  in part  on  Iron  Mountain's  ability  to  integrate
effectively  the  acquired  businesses  into  Iron  Mountain.   The  process  of
integrating such acquired businesses may involve unforeseen difficulties and may
require a disproportionate  amount of management's attention and Iron Mountain's
financial  and  other  resources.  No  assurance  can be given  that  additional
suitable  acquisition  candidates will be identified,  financed and purchased on
acceptable  terms,  or that  recent  acquisitions  or  future  acquisitions,  if
completed, will be successful.

         In  September,  1997  Iron  Mountain  amended  and  restated  its  bank
facility,  dated as of September 30, 1996 among Iron Mountain, the lenders party
thereto and The Chase  Manhattan  Bank,  as  Administrative  Agent (the  "Credit
Agreement").  Under  the terms of the  Credit  Agreement,  acquisitions  by Iron
Mountain  involving in excess of: (i) $65 million (other than the acquisition of
Arcus Group,  Inc. (the "Arcus  Acquisition")  and the  acquisition of HIMSCORP,
Inc.  ("HIMSCORP"))  for  any one  acquisition  and  (ii)  $150  million  in the
aggregate  or $100 million in cash for 1998 or any  subsequent  year require the
approval  of lenders  holding  51% or more of the  commitments  under the Credit
Agreement.  No  assurance  can be given  that the  lenders  will  consent to any
acquisitions that Iron Mountain proposes to make in excess of such limits.

         The size,  timing and integration of possible future  acquisitions  may
cause substantial  fluctuations in operating results from quarter to quarter. As
a result, operating results for any quarter may not be indicative of the results
that may be  achieved  for any  subsequent  fiscal  quarter or for a full fiscal
year.

Competition; Alternative Technologies

         Iron Mountain has one or more competitors in all geographic areas where
it operates.  Iron Mountain  believes that competition for customers is based on
price,  reputation  for  reliability,  quality of service and scope and scale of
technology,  and believes that it generally competes  effectively based on these
factors.  As a result of this competition,  the records management  industry has
for the past several years experienced  downward pricing  pressures.  While Iron
Mountain  believes  that this pricing  climate is  stabilizing,  there can be no
assurance that prices will not decline  further,  as competitors seek to gain or
preserve  market  share.  Should a further  downward  trend in pricing  occur or
continue for an extended period of time, it could have a material adverse effect
on Iron  Mountain's  results of  operations.  Iron  Mountain  also  competes for
acquisition candidates.  Some of Iron Mountain's competitors may possess greater
financial and other resources than Iron Mountain. If any such competitor were to
devote  additional  resources  to  the  records  management  business  and  such
acquisition candidates or to focus its strategy on Iron Mountain's markets, Iron
Mountain's results of operations could be adversely affected. In addition,  Iron
Mountain faces competition from the internal document handling capability of its
current and potential customers. There can

                                        6
<PAGE>
be no assurance that these  organizations  will outsource more of their document
management  needs  or that  they  will  not  bring  in-house  some or all of the
functions they currently outsource.

         The substantial  majority of Iron Mountain's revenues have been derived
from the storage of paper  documents  and from  related  services.  Such storage
requires  significant physical space.  Alternative  technologies for generating,
capturing,  managing,  transmitting and storing information have been developed,
many of which require  significantly  less space than paper.  Such  technologies
include computer media,  microforms,  audio/video tape, film, CD-ROM and optical
disk. None of these  technologies  has replaced paper as the principal means for
storing  information.  However,  there  can be no  assurance  that  one or  more
non-paper-based  technologies  (whether now existing or developed in the future)
may not in the future reduce or supplant the use of paper as a preferred medium,
which could in turn adversely affect Iron Mountain's business.

Financial Leverage; Debt Service Requirements

         Iron Mountain is highly  leveraged due to the substantial  indebtedness
it has incurred  primarily to finance  acquisitions  and expand its  operations.
Iron  Mountain  expects to continue  to borrow  under the Credit  Agreement  and
possible  future  credit  arrangements  in  order  to  finance  possible  future
acquisitions and for general corporate purposes.

         The ability of Iron  Mountain to repay its  indebtedness  depends  upon
future operating performance, which is subject to the success of Iron Mountain's
business strategy,  prevailing economic conditions, levels of interest rates and
financial,  business and other factors, many of which are beyond Iron Mountain's
control.  The debt service  obligations  of Iron Mountain  could have  important
consequences,  including  the  following:  (i) the  ability of Iron  Mountain to
obtain  additional  financing for future  working  capital needs or for possible
future acquisitions or other purposes may be limited; (ii) a substantial portion
of Iron Mountain's cash flow from operations will be dedicated to the payment of
principal and interest on its indebtedness, thereby reducing funds available for
other purposes;  (iii) Iron Mountain may be more vulnerable to adverse  economic
conditions  than some of its  competitors and thus may be limited in its ability
to withstand  competitive  pressures;  and (iv) Iron Mountain may be more highly
leveraged than certain of its  competitors,  which may place it at a competitive
disadvantage.

         A substantial  portion of Iron  Mountain's cash flow from operations is
required for debt service. Management believes that cash flow from operations in
conjunction with borrowings from existing and possible future credit  facilities
will be sufficient for the foreseeable future to meet debt service  requirements
and to make possible  future  acquisitions  and capital  expenditures.  However,
there can be no assurance in this regard,  and Iron  Mountain's  leverage  could
make  it  vulnerable  to  a  downturn  in  the  operating   performance  of  its
subsidiaries, a downturn in economic conditions or, because borrowings under the
Credit Agreement bear interest at rates which  fluctuate,  increases in interest
rates on  borrowings  under  the  Credit  Agreement.  If such cash flow were not
sufficient to meet such debt service requirements or payments of principal, Iron
Mountain could be required to sell additional equity  securities,  refinance its
obligations or dispose of assets in order to make such scheduled payments. There
can be no  assurance  that Iron  Mountain  would be able to  effect  any of such
transactions or do so on favorable terms.

Casualty

         Iron Mountain currently  maintains and intends to continue to maintain,
to the extent such  insurance  is available on  commercially  reasonable  terms,
comprehensive  liability,  fire,  flood and earthquake  (where  appropriate) and
extended  coverage  insurance with respect to the properties that it now owns or
leases or that it may in the  future  own or lease,  with  customary  limits and
deductibles.  Certain types of loss,  however,  may not be fully  insurable on a
cost-effective  basis,  such as losses from  earthquakes,  or may be  altogether
uninsurable,  such as losses from riots.  Iron Mountain has in the past suffered
damages and losses from an earthquake  and a riot in  California,  which damages
and losses were substantially covered by insurance. In March 1997, Iron Mountain
experienced three fires, all of which authorities have determined were caused by
arson and which  resulted  in  extensive  damage to one and  destruction  of the
Company's other records  management  facility in South Brunswick  Township,  New
Jersey.  Iron Mountain has filed several  insurance  claims related to the South
Brunswick fires,  including a significant claim under its business  interruption
insurance policy.  Some of the Company's  customers or their insurance  carriers
have asserted claims or filed lawsuits as a consequence of the destruction of or
damage to their  records due to the fires.  The Company is a defendant  in three
such lawsuits. The outcome of these claims and proceedings cannot be

                                        7
<PAGE>
predicted.  Based on its present assessment of the situation, after consultation
with legal counsel, management does not believe that the outcome of these claims
and lawsuits will have a material  adverse effect on Iron  Mountain's  financial
condition or results of  operations,  although there can be no assurance in this
regard.

         In the future,  should uninsured losses or damages occur, Iron Mountain
could lose both its investment in and anticipated profits and cash flow from the
affected property and may continue to be obligated on any leasehold obligations,
mortgage  indebtedness  or other  obligations  related  to such  property.  As a
result, any such loss could materially adversely affect Iron Mountain.

History of Losses; EBITDA Objective

         Iron Mountain has a history of  experiencing  net losses  applicable to
common  stockholders.  Such net losses are  attributable  in part to significant
non-cash charges associated with Iron Mountain's pursuit of its growth strategy,
namely, (i) depreciation and amortization  expenses associated with expansion of
Iron Mountain's storage capacity and (ii) goodwill amortization  associated with
acquisitions  accounted for under the purchase method.  In addition,  net income
applicable to common  stockholders has been negatively  affected by a charge for
accretion of a redeemable put warrant and, in 1996, by an  extraordinary  charge
related  to the early  retirement  of debt.  The put  warrant  was  redeemed  in
February 1996, upon completion of Iron Mountain's initial public offering.

         Iron Mountain's primary financial objective is to increase its earnings
before  interest,  taxes,  depreciation,  amortization and  extraordinary  items
("EBITDA"),  which  is a  source  of  funds  to  service  indebtedness  and  for
investment in continued internal growth and growth through acquisitions, and not
net income and net income applicable to common  stockholders.  Iron Mountain has
benefited  from  growth  in  EBITDA,  while  net  losses  applicable  to  common
stockholders  have  increased  over such period.  Based on its experience in the
records management industry,  Iron Mountain believes that EBITDA is an important
tool for measuring the performance of records  management  companies  (including
potential  acquisition  targets) in several areas, such as liquidity,  operating
performance  and  leverage.  In  addition,  lenders use EBITDA as a criterion in
evaluating  records  management   companies,   and  Iron  Mountain's   financing
agreements  contain  covenants in which EBITDA is used as a measure of financial
performance.  Other measures of Iron Mountain's financial  performance,  such as
net  income  and  net  income  applicable  to  common  stockholders,  have  been
negatively  affected by pursuit of Iron Mountain's  objective to increase EBITDA
and may be  negatively  affected in the future.  In addition,  execution of Iron
Mountain's  growth  strategy  could result in future net losses due to increased
interest  expense  associated  with  borrowings  under the Credit  Agreement and
possible future credit arrangements and increased  depreciation and amortization
expenses.

Anti-Takeover  Effect of Certain  Provisions of Iron  Mountain's  Certificate of
Incorporation, By-Laws and the Notes Indentures

         Certain provisions of Iron Mountain's Amended and Restated  Certificate
of Incorporation  (the "Restated  Certificate") and Iron Mountain's By-Laws (the
"By-Laws")  could have the effect of making it more  difficult for a third party
to acquire,  or  discouraging  a third party from  acquiring,  a majority of the
outstanding  capital stock of Iron Mountain and could make it more  difficult to
consummate certain types of transactions involving an actual or potential change
in control of Iron  Mountain,  such as a merger,  tender offer or proxy contest.
The Restated Certificate also provides for three classes of Directors,  as equal
in number as possible,  to be elected on a staggered basis (one class per year).
As a  result  of such a  provision,  it would  generally  require  at least  two
elections of the Iron Mountain Board of Directors (the "Iron Mountain Board") to
replace a majority of the members of the Iron Mountain Board,  thereby  enabling
existing management to exercise significant control over Iron Mountain's affairs
during such period.  Pursuant to the Restated  Certificate,  shares of preferred
stock,  $.01 par value per share (the  "Preferred  Stock")  may be issued in the
future without further stockholder  approval and upon such terms and conditions,
and having such rights,  privileges and preferences (including the right to vote
and the right to convert  into Common  Stock),  as the Iron  Mountain  Board may
determine.  Pursuant to the By-Laws,  approximately 4 million shares of Common
Stock  that were  issued by the  Company  in five  acquisitions  are  subject to
restrictions  on transfer  for varying  periods of time,  all of which expire by
January 1999.  A significant portion of such shares are held by affiliates.

                                        8
<PAGE>
         Iron  Mountain  currently  has  outstanding  $165,000,000  in aggregate
principal amount of 10 1/8% Senior Subordinated Notes due 2006 issued in October
1996 (the "1996 Notes") and $250,000,000 in aggregate principal amount of 8 3/4%
Senior Subordinated Notes due 2009 issued in October 1997 (the "1997 Notes;" and
collectively  with the 1996  Notes,  the  "Senior  Subordinated  Notes").  Under
certain  circumstances  relating  to a change of  control  of Iron  Mountain  (a
"Change of Control") as set forth in the indentures for the Senior  Subordinated
Notes (the "Notes Indentures"),  Iron Mountain will be required to make an offer
to  purchase  all of the  outstanding  Senior  Subordinated  Notes at a purchase
price, in cash,  equal to 101% of the principal  amount thereof plus accrued and
unpaid interest, if any, to the date of purchase. There can be no assurance that
Iron Mountain  would be able to obtain such funds  through a refinancing  of the
Senior  Subordinated  Notes to be purchased or  otherwise,  or that the purchase
would be permitted under the Credit  Agreement.  Also, the requirement that Iron
Mountain  make an offer to purchase  all of the Senior  Subordinated  Notes then
outstanding in the event of a Change of Control may have the effect of deterring
a third party from  effecting a  transaction  that would  constitute a Change of
Control.

Control by Principal Stockholders

         The voting power held by certain  large  stockholders  of Iron Mountain
may have the effect of discouraging  certain types of transactions  involving an
actual or potential change of control of Iron Mountain,  including  transactions
in which the holders of Common Stock might otherwise receive a premium for their
shares over then-current market prices. In addition,  as a result of such voting
power such stockholders have the ability to significantly affect the election of
Directors of Iron Mountain who, in turn,  control the  management and affairs of
Iron Mountain.

Environmental Matters

         As of  September  30,  1997,  Iron  Mountain  owned or leased  over 150
records  management   facilities.   Under  various  federal,   state  and  local
environmental laws, ordinances and regulations  ("Environmental Laws"), an owner
of real estate or a lessee conducting  operations  thereon may become liable for
the costs of  investigation,  removal  or  remediation  of soil and  groundwater
contaminated by certain  hazardous  substances or wastes or petroleum  products.
Certain such laws impose cleanup  responsibility and liability without regard to
whether the owner or operator of the real estate or  operations  thereon knew of
or was responsible for the  contamination,  and whether or not operations at the
property have been  discontinued or title to the property has been  transferred.
In  addition,  the  presence  of such  substances,  or the  failure to  properly
remediate such property,  may adversely  affect the current  property owner's or
operator's  ability  to sell or rent  such  property  or to  borrow  using  such
property as collateral.  The owner or operator of contaminated  real estate also
may be subject to common law claims by third  parties based on damages and costs
resulting from off-site migration of the contamination.

         Certain  Environmental  Laws  govern  the  removal,   encapsulation  or
disturbance  of  asbestos-containing  materials  ("ACMs").  Such laws may impose
liability for release of ACMs and may enable third parties to seek recovery from
owners or operators of real estate for personal injury  associated with exposure
to such substances.  Certain facilities operated by Iron Mountain contain or may
contain ACMs. In addition, certain of the properties formerly or currently owned
or  operated by Iron  Mountain  were  previously  used for  industrial  or other
purposes that  involved the use or storage of hazardous  substances or petroleum
products  or the  generation  and  disposal  of  hazardous  wastes,  and in some
instances,  included the operation of  underground  storage tanks  ("USTs").  In
connection  with its  former  and  current  ownership  or  operation  of certain
properties, Iron Mountain may be potentially liable for environmental costs such
as those discussed above.  Iron Mountain has from time to time conducted certain
environmental  investigations  and remedial  activities at certain of its former
and current facilities,  but an in-depth  environmental review of all properties
has not yet been conducted by or on behalf of Iron Mountain.

         Iron  Mountain  believes  it  is in  substantial  compliance  with  all
applicable  material  Environmental  Laws.  No assurance can be given that there
are,  or  as a  result  of  possible  future  acquisitions  there  will  be,  no
environmental  conditions  for which Iron Mountain might be liable in the future
or  that  future   regulatory   action,   as  well  as  compliance  with  future
Environmental  Laws, will not require Iron Mountain to incur costs for or at its
properties  that  could  have a  material  adverse  effect  on  Iron  Mountain's
financial condition and results of operations.

                                        9
<PAGE>

No Intention to Pay Dividends

         Iron Mountain has never  declared or paid cash dividends on its capital
stock.  Iron Mountain  intends to retain future earnings for use in its business
and does not  anticipate  declaring  or paying any cash  dividends  on shares of
Common Stock in the foreseeable future. In addition,  Iron Mountain is currently
restricted under the terms of the Credit Agreement and the Notes Indentures from
declaring or paying cash dividends on its Common Stock.



                          DESCRIPTION OF CAPITAL STOCK

         The  following  description  of the capital  stock of Iron Mountain and
certain provisions of the Restated  Certificate and the By-Laws is a summary and
is qualified in its  entirety by reference to the Restated  Certificate  and the
By-Laws.

         Iron Mountain's authorized capital stock consists of 100,000,000 shares
of Common Stock,  1,000,000 shares of nonvoting common stock, par value $.01 per
share (the " Nonvoting Common Stock"),  and 2,000,000 shares of Preferred Stock.
No shares of Preferred Stock have been issued.  There were 13,452,917  shares of
Common  Stock held by 219  holders of record and no shares of  Nonvoting  Common
Stock issued and outstanding as of January 5, 1998.

Common Stock

         The  rights of holders of the  Common  Stock and the  Nonvoting  Common
Stock are identical in all respects except voting and convertibility.

         Dividends.  Holders of record of shares of Common  Stock and  Nonvoting
Common Stock on the record date fixed by the Iron Mountain Board are entitled to
receive  such  dividends  as may be declared by the Iron  Mountain  Board out of
funds legally  available for such purpose.  No dividends may be declared or paid
in cash or property on any share of either class, however, unless simultaneously
the same  dividend is declared or paid on each share of the other class.  In the
case of any stock  dividend,  holders of each class are  entitled to receive the
same percentage dividend (payable in shares of that class) as the holders of the
other class.

         Iron  Mountain is  currently  restricted  under the terms of the Credit
Agreement and the Notes  Indentures from paying cash dividends on the Common and
Nonvoting Common Stock.  Even if funds were to be available,  Iron Mountain does
not intend to pay dividends in the foreseeable future.

         Voting  Rights.  Except as  otherwise  required  by law, on each matter
submitted  for a vote of  stockholders,  holders  of shares of Common  Stock are
entitled to one vote per share and  holders of  Nonvoting  Common  Stock are not
entitled to vote.

         Under the Restated Certificate,  the vote of holders of at least 80% of
the voting power of all  outstanding  shares of capital  stock  entitled to vote
generally in the election of Directors,  voting  together as a single class (the
"Voting Power"),  is required for the amendment or repeal of, or the adoption of
any  provision   inconsistent  with,  provisions  of  the  Restated  Certificate
establishing  a classified  Board of Directors.  The vote of holders of at least
662/3% of such Voting Power is required  for the  amendment or repeal of, or the
adoption  of  any  provision  inconsistent  with,  provisions  of  the  Restated
Certificate  authorizing the Preferred Stock,  Common Stock and Nonvoting Common
Stock or specifying the terms of the Common Stock and the Nonvoting Common Stock
(including  any amendment to increase any shares of authorized  capital  stock).
Certain other  provisions also require such a 662/3% vote. See "DGCL and Certain
Provisions of the Restated Certificate and the By-Laws." There are no cumulative
voting rights in the election of the Board of Directors of the Company.

                                       10
<PAGE>
         Conversion   Provisions.   Shares  of   Nonvoting   Common   Stock  are
convertible, at any time at the option of the holder, on a share-for-share basis
into shares of Common Stock without the payment of any additional consideration;
provided that the conversion of any shares of Nonvoting  Common Stock by a "bank
holding  company" under the Bank Holding Company Act of 1956, as amended,  or an
affiliate  thereof is prohibited if the conversion of the total number of shares
of Nonvoting  Common Stock held by such holder would cause it to be in violation
of such Act.

         Liquidation Rights. Upon liquidation, dissolution or winding-up of Iron
Mountain, the holders of Common Stock and Nonvoting Common Stock are entitled to
share ratably  (based on the number of shares held) in all assets  available for
distribution  after  payment  in full of  creditors  and  payment in full to any
holders of Preferred  Stock then  outstanding of any amount  required to be paid
under the terms of such Preferred Stock.

         Other Provisions.  The outstanding shares of Common Stock and Nonvoting
Common Stock are validly issued,  fully paid and  nonassessable.  In any merger,
consolidation  or  business  combination,  holders of each  class  will  receive
identical consideration,  except that in any such transaction in which shares of
stock are distributed,  such shares may differ as to voting rights to the extent
that voting  rights now differ  between the two  classes.  Neither  class may be
subdivided,   consolidated,    reclassified   or   otherwise   changed   unless,
concurrently,  the other  class is  subdivided,  consolidated,  reclassified  or
otherwise changed in the same proportion and in the same manner.

         The  Transfer  Agent  and  Registrar  for the  Common  Stock is  Boston
Equiserve Limited Partnership,  150 Royall Street,  Canton,  Massachusetts 02021
(telephone number (781) 575-2000).

         The Iron Mountain Board has the power to issue shares of authorized but
unissued  Common Stock and Nonvoting  Common Stock without  further  stockholder
action.  The holders of Common Stock and Nonvoting Common Stock are not entitled
to preemptive or subscription rights. The issuance of such unissued shares could
have the effect of diluting  the  earnings per share and book value per share of
currently outstanding shares of Common Stock.

Preferred Stock

         The  authorized  and unissued  shares of Preferred  Stock may be issued
with such designations, preferences, limitations and relative rights as the Iron
Mountain Board may authorize including,  but not limited to: (i) the distinctive
designation  of each series and the number of shares that will  constitute  such
series;  (ii) the voting  rights,  if any, of shares of such  series;  (iii) the
dividend  rate on the shares of such  series,  any  restriction,  limitation  or
condition  upon  the  payment  of such  dividends,  whether  dividends  shall be
cumulative,  and the dates on which  dividends  are payable;  (iv) the prices at
which,  and the terms and conditions on which,  the shares of such series may be
redeemed,  if such  shares are  redeemable;  (v) the  purchase  or sinking  fund
provisions,  if any,  for the purchase or  redemption  of shares of such series;
(vi) any preferential  amount payable upon shares of such series in the event of
the liquidation,  dissolution or winding-up of Iron Mountain or the distribution
of its  assets;  and (vii) the price or rates of  conversion  at which,  and the
terms and  conditions  on which the shares of such series may be converted  into
other securities, if such shares are convertible.  Although Iron Mountain has no
present  intention to issue shares of Preferred Stock, the issuance of Preferred
Stock,  or the issuance of rights to purchase such shares,  could  discourage an
unsolicited  acquisition proposal and the rights of holders of Common Stock will
be subject to, and may be  adversely  affected  by, the rights of holders of any
Preferred Stock that may be issued in the future.


             DGCL AND CERTAIN PROVISIONS OF THE RESTATED CERTIFICATE
                                 AND THE BY-LAWS

         The Restated  Certificate and the By-Laws  contain  certain  provisions
that could delay or make more  difficult  the  acquisition  of Iron  Mountain by
means of a tender  offer,  a proxy contest or otherwise.  These  provisions,  as
described below, are expected to discourage  certain types of coercive  takeover
practices  and  inadequate  takeover  bids and to encourage  persons  seeking to
acquire  control of Iron Mountain first to negotiate  with Iron  Mountain.  Iron
Mountain  believes  that the benefits of increased  protection of its ability to
negotiate with the proponent of an unfriendly or unsolicited proposal to acquire
or 

                                       11
<PAGE>

restructure  Iron  Mountain  outweigh the  disadvantages  of  discouraging  such
proposals  because,  among  other  things,  negotiations  with  respect  to such
proposals could result in an improvement of their terms.

Classified Board of Directors

         The  Restated  Certificate  and the  By-Laws  provide  for a  Board  of
Directors  that is divided into three classes of  Directors,  as nearly equal in
number as possible,  with the term of each class  expiring in a different  year.
The By-Laws provide that the number of Directors will be fixed from time to time
exclusively  by the Iron Mountain  Board,  but shall consist of not more than 15
nor less than three Directors. The classified Iron Mountain Board is intended to
promote  continuity  and stability of Iron  Mountain's  management  and policies
since a majority of the  Directors at any given time will have prior  experience
as  Directors  of Iron  Mountain.  Such  continuity  and  stability  facilitates
long-range  planning of Iron Mountain's  business and ensures the quality of its
business operations. The classification of Directors has the effect of making it
more difficult to change the  composition of the Iron Mountain  Board.  At least
two annual stockholder  meetings,  instead of one, would be required to effect a
change in the majority  control of the Iron Mountain Board,  except in the event
of vacancies  resulting from removal (in which case the remaining Directors will
fill the vacancies so created).  See "--Removal of Directors;  Filling Vacancies
on the Iron Mountain Board."

Removal of Directors; Filling Vacancies on the Iron Mountain Board

         The Restated Certificate and Iron Mountain By-Laws provide that an Iron
Mountain  Director may be removed by the stockholders only for cause at any time
during such Director's  term of office by affirmative  vote of the holders of at
least 80% of the Voting Power.

         The By-Laws and the Restated Certificate both provide that a vacancy on
the Iron Mountain Board,  including a vacancy created by an increase in the size
of the Iron Mountain Board by the Directors,  may be filled by a majority of the
remaining Directors or by a sole remaining Director,  or if no Directors remain,
then by the  stockholders.  The  Restated  Certificate  also  provides  that any
Director  elected by the Iron Mountain  Board to replace  another  Director of a
given class of Directors  will hold office until the next election of such class
of  Directors.  These  provisions  are to  ensure  that a third  party  would be
precluded from removing incumbent  Directors and simultaneously  gaining control
of the Iron Mountain Board by filling the vacancies created by such removal with
its own nominees.  Moreover, even if the holders of the outstanding Common Stock
were to vote to remove Directors for cause,  only the remaining  Directors would
have the power to fill the vacancies  created by such removal,  unless such vote
provided for the removal of the entire Iron Mountain Board for cause.

Amendment of Certain Provisions of the Restated Certificate and the By-Laws

         The Restated  Certificate and the By-Laws contain provisions  requiring
the  affirmative  vote of the holders of at least  662/3% of the Voting Power to
amend  certain  provisions  of the Restated  Certificate  and the By-Laws.  This
supermajority  voting  provision  also  applies  to (i)  the  provisions  of the
Restated Certificate authorizing Iron Mountain to release its Directors from any
liability  for  monetary  damages as a result of any  breach of their  fiduciary
duties,  with certain  exceptions  mandated by the DGCL, and (ii) the provisions
allowing for the indemnification of officers and Directors of Iron Mountain. The
Restated Certificate provides that the By-Laws may be amended only by a majority
of the full Iron Mountain Board or by the  stockholders  holding at least 662/3%
of the Voting  Power.  The DGCL  provides  that  by-laws may not be amended by a
corporation's  Board  of  Directors  unless  the  corporation's  certificate  of
incorporation  expressly  authorizes  such amendments by the Board of Directors;
the  Restated  Certificate  includes  such  a  provision.   Under  the  Restated
Certificate,  at least 80% of the Voting Power is required to approve amendments
to  those  provisions  of the  Restated  Certificate  or Iron  Mountain  By-Laws
establishing a classified Board,  specifying notice requirements for stockholder
nominations  of Directors or business to be brought by a  stockholder  before an
annual meeting and limiting the rights of  stockholders  to remove  Directors or
fill vacancies on the Iron Mountain Board, to call special meetings or to effect
actions by written consent.

                                       12

<PAGE>

Stockholder Actions and Meetings

         Iron Mountain's Restated  Certificate  provides that stockholder action
may be taken only at an annual or special meeting of stockholders  and prohibits
stockholders  action by  written  consent  in lieu of a  meeting.  The  Restated
Certificate  and  Iron  Mountain   By-Laws  provide  that  special  meetings  of
stockholders can be called by the Chairman of the Board of Directors, if any, or
the Iron Mountain Board  pursuant to a resolution  approved by a majority of the
members of the Iron Mountain  Board.  The business  permitted to be conducted at
any special meeting of  stockholders  is limited to the business  brought before
the meeting by the Iron Mountain Board.  The By-Laws set forth an advance notice
procedure  with regard to the  nomination,  other than by or at the direction of
the Iron Mountain Board, of candidates for election as directors and with regard
to business brought before an annual meeting of stockholders of Iron Mountain.

Delaware Anti-Takeover Statute.

         Subject to certain  exceptions  set forth  therein,  Section 203 of the
DGCL provides that a  corporation  shall not engage in any business  combination
with any "interested  stockholder"  for a three-year  period  following the date
that such stockholder becomes an interested stockholder unless (i) prior to such
date,  the board of directors of the  corporation  approved  either the business
combination  or the  transaction  that resulted in the  stockholder  becoming an
interested stockholder,  (ii) upon consummation of the transaction that resulted
in  the  stockholder   becoming  an  interested   stockholder,   the  interested
stockholder  owned  at  least  85%  of  the  voting  stock  of  the  corporation
outstanding at the time the transaction  commenced (excluding certain shares) or
(iii) on or subsequent to such date, the business combination is approved by the
board of directors of the corporation  and by the  affirmative  vote of at least
662/3% of the  outstanding  voting  stock  which is not owned by the  interested
stockholder.  Except as specified therein, an interested  stockholder is defined
to mean  any  person  that (a) is the  owner  of 15% or more of the  outstanding
voting  stock of the  corporation  or (b) is an  affiliate  or  associate of the
corporation and was the owner of 15% or more of the outstanding  voting stock of
the corporation at any time within three years immediately prior to the relevant
date, or any affiliate or associate of such person  referred to in (a) or (b) of
this  sentence.  Under certain  circumstances,  Section 203 of the DGCL makes it
more  difficult  for  an  interested  stockholder  to  effect  various  business
combinations  with  a  corporation  for  a  three-year   period,   although  the
stockholders may, by adopting an amendment to the  corporation's  certificate of
incorporation  or by-laws,  elect not to be governed by this section,  effective
twelve months after  adoption.  The Restated  Certificate and the By-Laws do not
exclude Iron  Mountain  from the  restrictions  imposed under Section 203 of the
DGCL.  It is  anticipated  that the  provisions  of Section  203 of the DGCL may
encourage  companies  interested  in  acquiring  Iron  Mountain to  negotiate in
advance with the Iron Mountain Board.

                                  LEGAL MATTERS

         The validity of the shares of Common Stock  offered by this  Prospectus
have been  passed upon for the  Company by  Sullivan &  Worcester  LLP,  Boston,
Massachusetts.  Jas. Murray Howe,  Secretary of Iron Mountain,  is of counsel to
Sullivan & Worcester LLP and beneficially owns 3,855 shares of Common Stock.

                                     EXPERTS

         The  consolidated  financial  statements  and schedule of Iron Mountain
Incorporated  and its  subsidiaries for the three years ended December 31, 1996,
included in Iron  Mountain's  Annual  Report on Form 10-K,  have been audited by
Arthur Andersen LLP, independent public accountants,  as stated in their reports
with respect thereto,  and are incorporated by reference herein in reliance upon
the authority of said firm as experts in giving said reports.

         The financial statements of Nashville Vault Company,  Ltd. for the year
ended December 31, 1995, included in Iron Mountain's  Registration  Statement on
Form S-4 (file No. 333-24635, effective date May 14, 1997), have been audited by
Geo.  S. Olive & Co. LLC,  independent  public  accountants,  as stated in their
report  with  respect  thereto,  and are  incorporated  by  reference  herein in
reliance upon the authority of said firm as experts in giving said report.

                                       13
<PAGE>

         The financial  statements of International Record Storage and Retrieval
Services, Inc. for the year ended December 31, 1995, included in Iron Mountain's
Registration  Statement on Form S-4 (file No. 333-24635,  effective date May 14,
1997), have been audited by Rothstein,  Kass & Company, P.C., independent public
accountants,   as  stated  in  their  report  with  respect  thereto,   and  are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said report.

         The financial  statements of Mohawk Business  Record Storage,  Inc. for
the year ended  December  31,  1995,  included in Iron  Mountain's  Registration
Statement on Form S-4 (file No.  333-24635,  effective date May 14, 1997),  have
been audited by Arthur Andersen LLP,  independent public accountants,  as stated
in their report with respect  thereto,  and are incorporated by reference herein
in reliance upon the authority of said firm as experts in giving said report.

         The financial statements of Security Archives of Minnesota for the year
ended December 31, 1996,  included in Iron Mountain's Current Report on Form 8-K
dated October 30, 1997,  have been audited by Arthur  Andersen LLP,  independent
public  accountants,  as stated in their  report with respect  thereto,  and are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said report.

         The financial statements of Wellington Financial Services, Inc. for the
year ended December 31, 1996, included in Iron Mountain's Current Report on Form
8-K  dated  October  30,  1997,  have  been  audited  by  Arthur  Andersen  LLP,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

         The financial statements of Allegiance Business Archives,  Ltd. for the
year ended December 31, 1996, included in Iron Mountain's Current Report on Form
8-K dated November 25, 1997, have been audited by Stout, Causey & Horning, P.A.,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

         The financial  statements and schedule of Safesite  Records  Management
Corporation  for the three  years  ended  December  31,  1996,  included in Iron
Mountain's  Registration  Statement on Form S-4 (file no.  333-24635,  effective
date May 14, 1997), have been audited by Arthur Andersen LLP, independent public
accountants,   as  stated  in  their  reports  with  respect  thereto,  and  are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said reports.

         The financial statements of Concorde Group, Inc. and Neil Trucker Trust
for the year ended December 31, 1996, included in Iron Mountain's Current Report
on Form 8-K dated  October  30,  1997,  have been  audited by Fisher,  Schacht &
Oliver  LLP,  independent  public  accountants,  as stated in their  report with
respect  thereto,  and are incorporated by reference herein in reliance upon the
authority of said firm as experts in giving said report.

         The financial statements of Data Securities International, Inc. for the
year ended December 31, 1996, included in Iron Mountain's Current Report on Form
8-K  dated  October  30,  1997,  have  been  audited  by  Arthur  Andersen  LLP,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in giving said report.

         The financial statements of Records Retention/FileSafe,  LP for the two
years ended  December 31, 1996,  included in Iron  Mountain's  Current Report on
Form 8-K dated November 25, 1997, have been audited by Abbott Stringham & Lynch,
independent public accountants,  as stated in their report with respect thereto,
and are  incorporated by reference herein in reliance upon the authority of said
firm as experts in accounting and auditing.

         The   consolidated   financial   statements   of  HIMSCORP,   Inc.  and
Subsidiaries  for the period  February 1, 1995 to December  31, 1995 and for the
year ended December 31, 1996,  appearing in Iron  Mountain's  Current Reports on
Form 8-K dated  October 30, 1997 and  November  25,  1997,  have been audited by
Ernst & Young LLP, independent  auditors,  as set forth in their reports thereon
included therein,  and are incorporated by reference herein in reliance upon the
authority of said firm as experts in giving said report.

                                       14
<PAGE>

         The consolidated  financial  statements of Arcus  Technology  Services,
Inc.  (Successor  Company)  for the year ended  December  31,  1996 and the five
months ended  December 31, 1995 and the  consolidated  financial  statements  of
Arcus, Inc.  (Predecessor  Company) for the seven months ended July 31, 1995 and
the year ended December 31, 1994,  appearing in Iron Mountain's  Current Reports
on Form 8-K dated  October 30, 1997 and November 25, 1997,  have been audited by
Ernst & Young LLP, independent  auditors,  as set forth in their reports thereon
included  therein,  and  incorporated  by reference  herein in reliance upon the
authority of such firm as experts in accounting and auditing.

         The consolidated  financial statements of Arcus Group, Inc. for the two
years in the period  ended  December  31,  1996,  appearing  in Iron  Mountain's
Current  Reports on Form 8-K dated October 30, 1997 and November 25, 1997,  have
been audited by Ernst & Young LLP, independent  auditors,  as set forth in their
reports  thereon  included  therein,  and  incorporated  by reference  herein in
reliance upon the authority of such firm as experts in accounting and auditing.

         The consolidated financial statements of Arcus Group, Inc. for the year
ended December 31, 1994,  included in Iron Mountain's Current Report on Form 8-K
dated November 25, 1997, have been audited by Arthur  Andersen LLP,  independent
public  accountants,  as stated in their  report with respect  thereto,  and are
incorporated by reference  herein in reliance upon the authority of said firm as
experts in giving said report.

                                       15
<PAGE>

         No person has been  authorized to give any  information  or to make any
representations  other than those contained or incorporated by reference in this
Prospectus in connection  with the offer  contained in this  Prospectus  and, if
given or made, such  information or  representations  must not be relied upon as
having been  authorized by the Company or any  underwriters,  agents or dealers.
This Prospectus does not constitute an offer to sell or solicitation of an offer
to buy  securities in any  jurisdiction  to any person to whom it is unlawful to
make such offer or solicitation. Neither the delivery of this Prospectus nor any
sale made hereunder shall, under any  circumstances,  create an implication that
there has been no change in the  affairs  of the  Company  and its  subsidiaries
since the date hereof or the information  contained or incorporated by reference
herein is correct at any time subsequent to the date hereof.

                                TABLE OF CONTENTS
                                                                         Page
Available Information                                                    2
Incorporation of Certain Documents by Reference                          2
The Company                                                              3
Selected Consolidated Financial and Other Operating Information          4
Risk Factors                                                             6
Description of Capital Stock                                             10
DGCL and Certain Provisions of the
 Restated Certificate and the By-laws                                    11
Legal Matters                                                            13
Experts                                                                  13


                                       16

<PAGE>



                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 20.  Indemnification of Directors and Officers.

         Section  145 of the  Delaware  General  Corporation  Law  (the  "DGCL")
provides, in effect, that any person made a party to any action by reason of the
fact that he is or was a Director,  officer,  employee or agent of Iron Mountain
may and, in certain cases, must be indemnified by Iron Mountain against,  in the
case of a non-derivative  action,  judgments,  fines, amounts paid in settlement
and reasonable expenses (including  attorney's fees) incurred by him as a result
of  such  action,  and in the  case of a  derivative  action,  against  expenses
(including  attorney's fees), if in either type of action he acted in good faith
and in a manner  he  reasonably  believed  to be in or not  opposed  to the best
interests of Iron Mountain. This indemnification does not apply, in a derivative
action,  to  matters  as to which it is  adjudged  that the  Director,  officer,
employee  or agent is liable to Iron  Mountain,  unless  upon court  order it is
determined that, despite such adjudication of liability,  but in view of all the
circumstances of the case, he is fairly and reasonably entitled to indemnity for
expenses,  and, in a non-derivative  action, to any criminal proceeding in which
such person had reasonable cause to believe his conduct was unlawful.

         Article Sixth of Iron Mountain's Restated  Certificate of Incorporation
provides that Iron Mountain shall indemnify each person who is or was an officer
or Director of Iron Mountain to the fullest  extent  permitted by Section 145 of
the DGCL.

         Article   Seventh   of  Iron   Mountain's   Restated   Certificate   of
Incorporation  states that no Director of Iron Mountain  shall be liable to Iron
Mountain or its  stockholders  for monetary damages for breach of fiduciary duty
as a  Director,  except to the extent that  exculpation  from  liability  is not
permitted under the DGCL as in effect when such breach occurred.


Item 21.  Exhibits

         Exhibits  indicated below are incorporated by reference to documents of
Iron  Mountain on file with the  Securities  and  Exchange  Commission.  Exhibit
numbers in parentheses  refer to the exhibit  numbers in the applicable  filing.
All other exhibits are filed herewith.


<TABLE>
<CAPTION>
     Exhibit No.                                    Item                                              Exhibit
     -----------                                    ----                                              -------
<S>       <C>                                                                              <C>  
          2.1         Agreement and Plan of Merger, dated as of September 26, 1997,                   (2.2)7
                      by and among Iron Mountain, Arcus Group, Inc., United
                      Acquisition Company and Arcus Technology Services, Inc.
                      (collectively, the "Arcus Parties")
          2.1A        Amendment No. 1 to Agreement and Plan of Merger, dated as of                   (2.1A)9
                      November 25, 1997, by and among Iron Mountain and each of
                      the Arcus Parties
          2.2         Agreement and Plan of Merger, dated as of February 19, 1997,                      (2)3
                      by and among Iron Mountain,  IM-1 Acquisition Corp. and
                      Safesite Records Management Corporation
          2.3         Amendment No. 1 to Agreement and Plan of Merger, dated as of                     (2A)5
                      April 1, 1997, by and among Iron Mountain,  IM-1 Acquisition
                      Corp. and Safesite Records Management Corporation
          2.4         Amendment No. 2 to Agreement and Plan of Merger, dated as of                     (2B)5
                      May 7, 1997, by and among Iron Mountain,  IM-1 Acquisition
                      Corp. and Safesite Records Management Corporation


                                      II-1

<PAGE>




          2.5         Agreement and Plan of Merger, dated as of August 25, 1997, by                   (2.3)7
                      and among Iron Mountain, DSI Acquisition Corporation and Data
                      Securities International, Inc.
          2.6         Agreement and Plan of Merger, dated as of September 17, 1997,                   (2.2)8
                      by and among Iron Mountain,  IM-3 Acquisition Corp. and
                      HIMSCORP, Inc.
          3.1         Amended and Restated Certificate of Incorporation of Iron            Filed herewith as Exhibit 3.1
                      Mountain, as amended
          3.2         Amended and Restated By-Laws of Iron Mountain, as amended            Filed herewith as Exhibit 3.2
          5           Opinion of Sullivan & Worcester LLP                                   Filed herewith as Exhibit 5
          10.1        Second Amended and Restated Credit Agreement, dated as of                      (10.1)7
                      September 26, 1997, among Iron Mountain, the lenders party
                      thereto and The Chase  Manhattan  Bank, as  Administrative
                      Agent
          10.2        Indenture for 101/8% Senior Subordinated Notes due 2006 by and                 (10.3)3
                      among Iron Mountain, certain of its subsidiaries and First
                      National Association, as trustee, dated October 1, 1996
          10.3        Indenture for 8 3/4% Senior Subordinated Notes due 2009 by and                  (4.1)6
                      among Iron Mountain, certain of its subsidiaries and The Bank of
                      New York, as trustee, dated October 24, 1997
          10.4        Iron Mountain Incorporated 1995 Stock Incentive Plan, as                       (10.1)4
                      amended
          10.5        Asset Purchase and Sale Agreement, dated November 22, 1995                    (10.17)1
                      among Iron Mountain Records Management, Inc. ("IMRM"),
                      Data Management Business Records Storage, Inc. and Outdoor
                      West, Inc.
          10.6        Record Center Storage Services Agreement between IMRM and                     (10.18)1
                      Resolution Trust Corporation, dated July 31, 1992, as renewed by
                      letter agreement effective July 26, 1996 between Iron Mountain
                      and the Federal Deposit Insurance Corporation
          10.7        Lease between IMRM and IM Houston (CR) Limited                                (10.19)1
                      Partnership, dated January 1, 1991
          10.8        Asset Purchase and Sale Agreement, dated July 11, 1996, among                 (10.20)2
                      IMRM, The Fortress Corporation and certain subsidiaries
          10.9        Stock Purchase and Sale Agreement, dated as of August 9, 1996,                (10.21)2
                      among IMRM and the shareholders of Data Archive Services of
                      Miami, Inc. and Data Archives Services, Inc.
          10.10       Asset Purchase Agreement, dated as of September 6, 1996,                      (10.23)2
                      among IMRM, Mohawk Business Record Storage, Inc., Michael
                      M. Rabin, Richard K. Rabin, Herman Ladin and Sidney Ladin
          10.11       Amended and Restated Registration Rights Agreement between                     (10.2)4
                      Iron Mountain and certain Stockholders, dated as of June 12,
                      1997


                                      II-2

<PAGE>




          10.12       Joinder to Registration Rights Agreement, dated as of October 31,             (10.12)9
                      1997, by and between Iron Mountain and Kent P. Dauten
          10.13       Stockholders' Agreement, dated September 17, 1997, by and            Filed herewith as Exhibit 10.13
                      between Iron Mountain and Kent P. Dauten
          10.14       Stockholders' Agreement, dated as of February 19, 1997 by and                 (10.20)3
                      among Iron Mountain and certain stockholders of Safesite Records
                      Management Corporation
          10.15       Asset Purchase and Sale Agreement, dated March 12, 1997, by                   (10.22)5
                      and among IMRM, Chicago Data Destruction Corporation, and
                      John Mengel and John S. Mengel
          10.16       Asset Purchase and Sale Agreement, dated as of August 20,                      (10.2)7
                      1997, by and between IMRM and Records Retention/FileSafe,
                      L.P.
          10.17       Stockholders' Agreement, dated as of September 26, 1997, by                   (10.16)9
                      and among Iron Mountain and certain stockholders of the Arcus
                      Parties
          10.18       Exchange and Registration Rights Agreement, dated as of                       (10.18)9
                      October 21, 1997, among Iron Mountain, certain subsidiaries of
                      Iron Mountain and Bear, Stearns & Co., Inc. on behalf of itself
                      and the other Initial Purchasers of Iron Mountain 8 3/4% Senior
                      Subordinated Notes due 2009
          11          Statement re: computation of per share earnings                                  (11)7
          21          Subsidiaries of Iron Mountain                                                    (21)9
          23.1        Consent of Ernst & Young LLP (Arcus Group, Inc. and Arcus            Filed herewith as Exhibit 23.1
                      Technology Services, Inc.)
          23.2        Consent of Arthur Andersen LLP (Arcus Group, Inc.)                   Filed herewith as Exhibit 23.2
          23.3        Consent of Ernst & Young LLP (HIMSCORP, Inc. and                     Filed herewith as Exhibit 23.3
                      Subsidiaries)
          23.4        Consent of Stout, Causey & Horning, P.A. (Allegiance Business        Filed herewith as Exhibit 23.4
                      Archives, Ltd.)
          23.5        Consent of Abbott, Stringham & Lynch (Records                        Filed herewith as Exhibit 23.5
                      Retention/FileSafe, LP)
          23.6        Consent of Arthur Andersen LLP (Security Archives of                 Filed herewith as Exhibit 23.6
                      Minnesota, Wellington Financial Services, Inc. and Data
                      Securities International, Inc.)
          23.7        Consent of Fisher, Schacht & Oliver, LLP (Concorde Group,            Filed herewith as Exhibit 23.7
                      Inc. and Neil Tucker Trust)
          23.8        Consent of Arthur Andersen LLP (Safesite Records Management          Filed herewith as Exhibit 23.8
                      Corporation and Mohawk Business Record Storage, Inc.)
          23.9        Consent of Geo S. Olive & Co. LLC (Nashville Vault                   Filed herewith as Exhibit 23.9
                      Company, Ltd.)


                                      II-3

<PAGE>




          23.10       Consent of Rothstein, Kass & Company, P.C. (International            Filed herewith as Exhibit 23.10
                      Record Storage and Retrieval Service, Inc.)
          23.11       Consent of Arthur Andersen LLP (Iron Mountain Incorporated)          Filed herewith as Exhibit 23.11
          23.12       Consent of Sullivan & Worcester LLP                                  Contained in Exhibit 5 filed herewith
          24          Powers of Attorney                                                   Contained on Page II-6 of the 
                                                                                             Registration Statement
          27          Financial Data Schedule                                                          (27)7



<FN>
1        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         33-99950 filed with the Securities and Exchange  Commission on December
         1, 1995.
2        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-10359  filed with the Securities and Exchange  Commission on August
         16, 1996.
3        Filed as an Exhibit to Iron  Mountain's  Annual Report on Form 10-K for
         the year  ended  December  31,  1996,  filed  with the  Securities  and
         Exchange Commission, File No. 0-27584.
4        Filed as an Exhibit to Iron  Mountain's  Quarterly  Report on Form 10-Q
         for the quarter  ended June 30,  1997,  filed with the  Securities  and
         Exchange Commission, File No. 0-27584.
5        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-24635 filed with the Securities and Exchange Commission on April 4,
         1997, as amended on May 7, 1997 and May 13, 1997.
6        Filed as an Exhibit to Iron Mountain's Current Report on Form 8-K dated
         October 30, 1997,  filed with the Securities  and Exchange  Commission,
         File No. 0-27584.
7        Filed as an Exhibit to Iron  Mountain's  Quarterly  Report on Form 10-Q
         for the quarter ended September 30, 1997, filed with the Securities and
         Exchange Commission, File No. 0-27584.
8        Filed as an Exhibit  to Iron  Mountain's  Current  Report on Form 8-K/A
         dated  November  10,  1997,  filed  with the  Securities  and  Exchange
         Commission, File No. 0-27584.
9        Filed as an  Exhibit  to Iron  Mountain's  Registration  Statement  No.
         333-41045 filed with the Securities and Exchange Commission on November
         26, 1997.
</FN>
</TABLE>


Item 22.  Undertakings

         Iron Mountain hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this Registration Statement:

              (i) To include any prospectus  required by Section 10(a)(3) of the
         Securities Act of 1933, as amended (the "Securities Act");

             (ii) To reflect in the prospectus any facts or events arising after
         the effective date of this  Registration  Statement (or the most recent
         post-effective  amendment  thereof)  which,   individually  or  in  the
         aggregate,  represent a fundamental change in the information set forth
         in this  Registration  Statement.  Notwithstanding  the foregoing,  any
         increase  or  decrease  in volume of  securities  offered (if the total
         dollar  value of  securities  offered  would not exceed  that which was
         registered) and any deviation from the low or high and of the estimated
         maximum offering range may be reflected in the form of prospectus filed
         with the Commission  pursuant to Rule 424(b) if, in the aggregate,  the
         changes in volume and price represent no more than 20 percent change in
         the maximum aggregate offering price set forth  in the  "Calculation of
         Registration  Fee" table in the effective Registration Statement;

                                      II-4

<PAGE>
            (iii) To include any material  information  with respect to the plan
         of distribution not previously disclosed in the Registration  Statement
         or  any  material  change  to  such  information  in  the  Registration
         Statement;

provided,  however,  that the  undertakings  set forth in paragraphs  (1)(i) and
(1)(ii)  above do not apply if the  information  required  to be  included  in a
post-effective  amendment by those  paragraphs is contained in periodic  reports
filed  by  the  Registrant  pursuant  to  Section  13 or  Section  15(d)  of the
Securities Act of 1934, as amended (the "Exchange Act") that are incorporated by
reference in this Registration Statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
Securities Act, each such  post-effective  amendment shall be deemed to be a new
Registration  Statement  relating to the  securities  offered  therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof;

         (3) To remove from registration by means of a post-effective  amendment
any of the securities being registered which remain unsold at the termination of
the offering;

         (4)  That,  for  purposes  of  determining   any  liability  under  the
Securities  Act,  each  filing of the  Registrant's  Annual  Report  pursuant to
Section 13(a) or Section 15(d) of the Exchange Act (and where  applicable,  each
filing of an employee  benefit plan's annual report pursuant to Section 15(d) of
the  Exchange  Act)  that is  incorporated  by  reference  in this  Registration
Statement  shall be deemed to be a new  registration  statement  relating to the
securities  offered  therein,  and the offering of such  securities at that time
shall be deemed to be the initial bona fide offering thereof;

         (5) That prior to any public  reoffering of the  securities  registered
hereunder  through  use of a  prospectus  which  is a part of this  Registration
Statement,  by any person or party who is deemed to be an underwriter within the
meaning  of  Rule  145(c),  the  Registrant   undertakes  that  such  reoffering
prospectus   will  contain  the   information   called  for  by  the  applicable
registration  form with  respect to  reofferings  by  persons  who may be deemed
underwriters,  in addition to the  information  called for by the other items of
the applicable form;

         (6) That every prospectus:  (i) that is filed pursuant to paragraph (4)
immediately preceding, or (ii) that purports to meet the requirements of Section
10(a)(3) of the  Securities  Act and is used in  connection  with an offering of
securities  subject to Rule 415,  will be filed as a part of an amendment to the
Registration  Statement and will not be used until such  amendment is effective,
and that, for purposes of determining  any liability  under the Securities  Act,
each such  post-effective  amendment  shall be  deemed to be a new  registration
statement relating to the securities  offered therein,  and the offering of such
securities  at that time shall be deemed to be the  initial  bona fide  offering
thereof;

         (7) To respond to requests  for  information  that is  incorporated  by
reference into the prospectus  pursuant to Item 4, 10(b), 11 or 13 of this form,
within one business day of receipt of such request, and to send the incorporated
documents  by first class mail or other  equally  prompt  means.  This  includes
information  contained in documents  filed  subsequent to the effective  date of
this Registration Statement through the date of responding to the request;

         (8) To supply by means of a post-effective  amendment,  all information
concerning a transaction,  and the company being acquired involved therein, that
was not the subject of and included in the Registration Statement when it became
effective.

         Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to  Directors,  officers  and  controlling  persons of Iron
Mountain,  Iron Mountain has been advised that in the opinion of the  Securities
and  Exchange  Commission  such  indemnification  is  against  public  policy as
expressed in the Securities Act and is, therefore,  unenforceable.  In the event
that a claim  for  indemnification  against  such  liabilities  (other  than the
payment  by Iron  Mountain  in the  successful  defense of any  action,  suit or
proceeding)  is  asserted by such  Director,  officer or  controlling  person in
connection with the securities being  registered,  Iron Mountain will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit  to a  court  of  appropriate  jurisdiction  the  question  whether  such
indemnification  by it is against  public policy as expressed in the  Securities
Act and will be governed by the final adjudication of such issue.

                                      II-5
<PAGE>



                                   SIGNATURES

         Pursuant to the  requirements  of the  Securities  Act,  Iron  Mountain
Incorporated  has duly caused this  Registration  Statement  to be signed on its
behalf by the  undersigned,  thereunto duly  authorized,  in the City of Boston,
Commonwealth of Massachusetts, on January 13, 1998.


                            IRON MOUNTAIN INCORPORATED



                            By:  /s/ C. Richard Reese
                                 Name:  C. Richard Reese
                                 Title:   Chairman of the Board of Directors
                                           and Chief Executive Officer

         Pursuant to the  requirements of the Securities Act, this  registration
statement has been signed below on January 13, 1998 by the following  persons in
the capacities and on the dates indicated;  and each of the undersigned officers
and Directors of Iron Mountain  Incorporated  hereby  severally  constitutes and
appoints C. Richard Reese,  David S. Wendell and John F. Kenny, Jr., and each of
them,  to sign for him, and in his name in the capacity  indicated  below,  such
Registration  Statement for the purpose of registering such securities under the
Securities Act, and any and all amendments thereto, including without limitation
any registration  statement or post-effective  amendment thereof filed under and
meeting  the  requirements  of Rule  462(b)  under the  Securities  Act,  hereby
ratifying and  confirming  our signatures as they may be signed by our attorneys
to such Registration Statement and any and all amendments thereto.


<TABLE>
<CAPTION>
Signature                                             Title                                  Date


<S>                                                   <C>                                    <C> 
 /s/ C. Richard Reese                                 Chairman of the Board of Directors     January 13, 1998
C. Richard Reese                                      and Chief Executive Officer


 /s/ David S. Wendell                                 President, Chief Operating Officer     January 13, 1998
David S. Wendell                                      and Director


 /s/ John F. Kenny, Jr.                               Executive Vice President and Chief     January 13, 1998
John F. Kenny, Jr.                                    Financial Officer


 /s/ Eugene B. Doggett                                Executive Vice President and Director  January 13, 1998
Eugene B. Doggett


 /s/ Constantin R. Boden                              Director                               January 13, 1998
Constantin R. Boden


 /s/ Arthur D. Little                                 Director                               January 13, 1998
Arthur D. Little


                                      II-6

<PAGE>




 /s/ Vincent J. Ryan                                  Director                               January 13, 1998
Vincent J. Ryan


 /s/ B. Thomas Golisano                               Director                               January 13, 1998
B. Thomas Golisano


 /s/ Kent P. Dauten                                   Director                               January 13, 1998
Kent P. Dauten



 /s/ Clarke H. Bailey                                 Director                               January 13, 1998
Clarke H. Bailey



 /s/ Jean A. Bua                                      Vice President and Corporate           January 13, 1998
Jean A. Bua                                           Controller
</TABLE>









                                      II-7


                                                                     EXHIBIT 3.1

                              AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION
                                       OF
                           IRON MOUNTAIN INCORPORATED
                      (as amended through January 12, 1998)
                       -----------------------------------


         Iron Mountain Incorporated, a Delaware corporation (the "Corporation"),
hereby certifies as follows:

         A. The name of the Corporation is Iron Mountain  Incorporated,  and the
name under which the Corporation was originally  incorporated  was Iron Mountain
Information Services, Inc.

         B. The date of  filing of the  Corporation's  original  Certificate  of
Incorporation with the Secretary of State was November 15, 1990; and the date of
filing of its first Restated  Certificate of Incorporation with the Secretary of
State was December 13, 1990.

         C. This Restated Certificate of Incorporation restates,  integrates and
further amends the provisions of the first Restated Certificate of Incorporation
of the Corporation, as heretofore amended.

         D. This  Restated  Certificate  of  Incorporation  was duly  adopted in
accordance with Sections 242 and 245 of the Delaware General Corporation Law.

         E. The first Restated  Certificate of Incorporation of the Corporation,
as heretofore  amended, is hereby amended and restated effective at 9:00 a.m. on
February 6, 1996 to read in its entirety as follows:

         FIRST:  The name of the Corporation is Iron Mountain Incorporated.

         SECOND: The address of the Corporation's registered office in the State
of Delaware is The  Prentice-Hall  Corporation  System,  Inc., 1013 Centre Road,
City  of  Wilmington,  County  of New  Castle.  The  name  of the  Corporation's
registered agent at such address is The Prentice-Hall Corporation System, Inc.

         THIRD:  The nature of the  business  or  purposes  to be  conducted  or
promoted  by the  Corporation  are to engage in any lawful act or  activity  for
which corporations may be organized under the Delaware General Corporation Law.



<PAGE>


                                       -2-

         FOURTH:  The total number  shares of all classes of capital  stock that
Corporation  shall  have  authority  to  issue  is  One  Hundred  Three  Million
(103,000,000)1 shares, of which:

           (i)    One Hundred Million  (100,000,000)  shall be Common Stock, par
                  value $.01 per share (the "Common Stock"),2

          (ii)    One Million  (1,000,000)  shall be Nonvoting Common Stock, par
                  value  $.01  per  share  (the  "Nonvoting  Common  Stock"  and
                  together with the Common Stock, the "Common Shares"), and

         (iii)    Two Million  (2,000,000)  shall be Preferred  Stock, par value
                  $.01 per share (the "Preferred Stock" ).

         A.        CERTAIN DEFINITIONS.

         For purposes of this Certificate of  Incorporation,  unless the context
otherwise  requires,  the  following  terms (or any variant in the form thereof)
have the following respective meanings. Terms defined in the singular shall have
a comparable  meaning when used in the plural, and vice versa, and the reference
to any gender shall be deemed to include all genders.

                  The term "Applicable Law" shall mean any Law of any Authority,
         whether domestic or foreign,  including without  limitation all federal
         and state Laws,  to which the Person in question is subject or by which
         it or  any of its  business  or  operations  is  subject  or any of its
         property is bound.

                  The  term   "Authority"   shall  mean  any   governmental   or
         quasi-governmental   authority,   whether  administrative,   executive,
         judicial,  legislative or other, or any combination thereof,  including
         without limitation any federal, state,  territorial,  county, municipal
         or other  government  or  governmental  or  quasi-governmental  agency,
         authority,  board,  body,  branch,  bureau,  central bank or comparable
         agency or Entity,  commission,  court,  department,  instrumentality or
         other  political  unit or  subdivision  or other  Entity  of any of the
         foregoing, whether domestic or foreign.

                  The term  "Certificate of  Incorporation"  means this Restated
         Certificate of  Incorporation of the Corporation and any other document
         which pursuant to the Delaware  General  Corporation  Law constitutes a
         part of the Corporation's  Certificate of Incorporation,  including any
         amendment to or restatement  hereof and any  certificate of designation
         in respect of any  particular  class or series of Preferred  Stock from
         time to time in effect.

                  The term "Entity" shall mean any  corporation,  firm,  limited
         liability   company,    unincorporated    organization,    association,
         partnership, trust, business trust, joint stock

- --------
1        Amended June 3, 1997 and further amended January 12, 1998.
2        Amended June 3, 1997 and further amended January 12, 1998.


<PAGE>


                                       -3-

         company,  joint  venture  or other  organization,  entity or  business,
         whether acting in an individual,  fiduciary or other  capacity,  or any
         governmental  or  quasi-governmental  authority,  whether  domestic  or
         foreign and whether administrative, executive, judicial, legislative or
         other, or any combination thereof.

                  The  term  "Law"  shall  mean  any  administrative,  judicial,
         legislative  or  other  action,  code,  consent  decree,  constitution,
         decree,  directive,  enactment,  finding,  guideline,  law, injunction,
         interpretation,   judgment,   order,   ordinance,   policy   statement,
         proclamation, promulgation, regulation, requirement, rule, rule of law,
         rule of public policy,  settlement agreement,  statute, or writ, or the
         common law, or any particular  section,  part or provision thereof,  or
         any interpretation,  directive,  guideline or request (having the force
         of law), of any Authority.

                  The term  "Person"  shall mean any natural  individual  or any
Entity.

         B.       GENERAL.

         Any and all  shares of any class or  series  issued  for which the full
consideration  has been paid or delivered,  shall be deemed fully paid stock and
the  holders  of  such  shares  shall  not be  liable  for any  further  call or
assessment or any other payment thereon.

         No holder of any of the shares of stock of the Corporation, whether now
or hereafter  authorized or issued, shall be entitled as of right to purchase or
subscribe for (i) any unissued stock of any class, or (ii) any additional shares
of any class to be issued by reason of any increase of the  authorized  stock of
the  Corporation of any class,  or (iii) bonds,  certificates  of  indebtedness,
debentures or other securities convertible into or exchangeable, or carrying any
right to purchase or otherwise acquire, stock of any class of the Corporation.

         The  Board  of  Directors  of the  Corporation  may  from  time to time
authorize  by  resolution  the issuance of any or all shares of the Common Stock
and the  Preferred  Stock  herein  authorized  or any class or series of capital
stock hereafter authorized,  together with any additional shares of any class or
series to be issued by reason of any  increase  of the  authorized  stock of the
Corporation  of any class or series,  or bonds,  certificates  of  indebtedness,
debentures or other securities convertible into or exchangeable for, or carrying
any right to purchase or otherwise acquire,  stock of any class or series of the
Corporation,  for such  purposes,  in such amounts,  to such  Persons,  for such
consideration  and, in the case of the Preferred Stock, in one or more series or
classes,  all as the Board of Directors in its sole and absolute  discretion may
from time to time  determine  and without any vote,  approval,  consent or other
action by the stockholders, except as otherwise required by Applicable Law.

         C.       COMMON SHARES.

         Subject  to all the  rights  which may be  granted  to  holders  of the
Preferred Stock and except as otherwise required by Applicable Law, the relative
voting, dividend,  liquidation and other rights,  preferences and limitations or
restrictions of the Common Stock and the Nonvoting Common Stock are as follows:


<PAGE>


                                       -4-


         1. The Common Stock and the Nonvoting Common Stock shall have identical
rights and  privileges  in every  respect,  except as expressly set forth in the
following paragraphs of this Section C.

         2. Voting  Rights.  Except as otherwise  required by Applicable  Law or
this Certificate of Incorporation, on all matters to be voted on by stockholders
of the  Corporation,  each holder of Common Stock shall have one vote in respect
of each share of Common  Stock held of record by such holder on the books of the
Corporation. The holders of Nonvoting Common Stock shall not be entitled to vote
on any  matters  submitted  to the  stockholders  of the  Corporation  except as
otherwise  required by Applicable  Law, in which case (and  irrespective  of any
class vote  relating to  increases  or  decreases  in the  authorized  shares of
Nonvoting Common Stock such holders would otherwise be entitled to under Section
242(b) of the Delaware  General  Corporation  Law)  holders of Nonvoting  Common
Stock  shall  vote (at the rate of one vote for each share of  Nonvoting  Common
Stock held of record by such  holder on the books of the  Corporation)  together
with holders of Common Stock and, if applicable,  Preferred  Stock,  as a single
class on such matter unless otherwise required by Applicable Law (other than any
class vote required by Section 242(b) of the Delaware General  Corporation Law).
Except as otherwise  required by Applicable Law or provided herein or determined
by the Board of Directors  pursuant to Section D below,  holders of Common Stock
shall vote together with holders of Preferred  Stock having voting rights,  as a
single class on all matters submitted to the stockholders for a vote,  including
any amendment to increase or decrease the number of authorized  shares of Common
Stock  (irrespective of Section 242(b) of the Delaware General Corporation Law),
subject to any special or preferential  voting rights of any series of Preferred
Stock from time to time outstanding.

         3. Dividends.  At any time shares of Common Stock are  outstanding,  as
and when dividends or other distributions  payable in either cash, capital stock
of the Corporation  (other than Common Stock or Nonvoting Common Stock) or other
property  of the  Corporation  may be declared  by the Board of  Directors,  the
amount of any such  dividend  payable on each share of Common Stock shall in all
cases be equal to the amount of such dividend payable on each share of Nonvoting
Common  Stock,  and the  amount of any such  dividend  payable  on each share of
Nonvoting Common Stock shall in all cases be equal to the amount of the dividend
payable on each share of Common Stock.  Dividends and  distributions  payable in
shares  of  Common  Stock  may not be made on or to  shares  of any class of the
Corporation's  capital stock other than the Common Stock, and dividends  payable
in shares of Nonvoting Common Stock may not be made on or to shares of any class
of the  Corporation's  capital stock other than the Nonvoting Common Stock. If a
dividend or distribution  payable in shares of Common Stock shall be made on the
shares  of  Common  Stock,  a  dividend  or  distribution  payable  in shares of
Nonvoting Common Stock shall be made  simultaneously  on the shares of Nonvoting
Common Stock, and the number of shares of Nonvoting Common Stock payable on each
share of Nonvoting Common Stock pursuant to such dividend or distribution  shall
be equal to the number of shares of Common Stock payable on each share of Common
Stock pursuant to such dividend or  distribution.  If a dividend or distribution
payable  in shares of  Nonvoting  Common  Stock  shall be made on the  shares of
Nonvoting  Common Stock, a dividend or distribution  payable in shares of Common
Stock shall be made simultaneously on the shares of Common Stock, and the number
of shares of Common Stock payable on each share of Common Stock pursuant to such
dividend or distribution shall be equal to the number of shares of Nonvoting


<PAGE>


                                       -5-

Common Stock  payable on each share of Nonvoting  Common Stock  pursuant to such
dividend or distribution.

         4. Consideration on Merger, Consolidation, etc.; Distribution of Assets
Upon  Liquidation.  In any merger,  consolidation or business  combination,  the
consideration  to be received per share by the holders of shares of Common Stock
and shares of Nonvoting Common Stock shall be distributed  ratably to each share
of Common  Stock and  Nonvoting  Common Stock in  accordance  with the number of
shares thereof and without regard to class,  except that in any such transaction
in which  shares of  capital  stock  and/or  other  securities  (including  debt
securities)  (including  without  limitation those of a surviving Entity, or the
direct or indirect parent Entity thereof,  whether or not such surviving  Entity
is the Corporation) are to be distributed, such shares (or other securities) may
differ  only as to voting  rights to the extent  that the  voting  rights of the
Common Stock and the  Nonvoting  Common Stock differ  immediately  prior to such
merger, consolidation or business combination.

         In the event the  Corporation  shall be liquidated,  dissolved or wound
up, whether  voluntarily or  involuntarily,  after there shall have been paid or
set aside for the holders of all shares of the Preferred Stock then  outstanding
the full preferential  amounts to which they may be entitled,  if any, under the
resolutions  authorizing the issuance of such Preferred Stock, the net assets of
the Corporation  remaining thereafter shall be distributed ratably to each share
of Common  Stock and  Nonvoting  Common Stock in  accordance  with the number of
shares thereof and without regard to class.  For the purposes of this paragraph,
neither the merger,  consolidation  or business  combination of the  Corporation
with or into any  other  Entity  in which the  stockholders  of the  Corporation
receive capital stock and/or other securities (including debt securities) of the
surviving Entity (or of the direct or indirect parent Entity  thereof),  nor the
sale,  lease or transfer by the  Corporation  of all or any part of its business
and assets, nor the reduction of the capital stock of the Corporation,  shall be
deemed to be a voluntary or involuntary  liquidation,  dissolution or winding up
of the Corporation.

         5.  Subdivision or  Combination of Common Shares.  The shares of Common
Stock or Nonvoting  Common  Stock,  as the case may be, shall not be split up or
subdivided  into a greater number of shares or combined into a smaller number of
shares,  whether by stock  distribution,  reclassification,  recapitalization or
otherwise,  unless  at the same time the  shares  of the  other  class of Common
Shares are split up, subdivided or combined so that the number of shares thereof
outstanding shall be proportionately adjusted.

         6.  Conversion  of  Nonvoting   Common  Stock  into  Common  Stock.  In
connection with any public offering or public sale of Common Stock  (including a
registered  offering  or a sale  pursuant  to Rule  144  promulgated  under  the
Securities  Act of 1933,  as amended,  or any similar rule then in force),  each
holder of Nonvoting Common Stock shall be entitled to convert any or all of such
holder's  shares of Nonvoting  Common Stock being  actually  distributed  to the
public or sold to an underwriter,  broker-dealer or market maker for actual sale
to the  public  into an equal  number  of shares of  Common  Stock  (subject  to
equitable   adjustment  to  reflect  stock  splits,   stock   dividends,   stock
combinations, recapitalizations and like occurrences).

         Each share of  Nonvoting  Common  Stock shall be  convertible  into one
share of  Common  Stock,  at any time and from time to time,  (i) if the  holder
thereof is not a "bank holding company"


<PAGE>


                                       -6-

or an affiliate of a "bank holding  company" under the Bank Holding  Company Act
of 1956, as amended (the "BHC Act"),  then at the option of the holder  thereof,
or (ii) if the holder  thereof is a "bank holding  company" or an affiliate of a
"bank holding  company" under the BHC Act, then upon delivery to the Corporation
of a certificate  signed by or on behalf of such holder or holders to the effect
that such holder and its affiliates  would hold less than 5% of the  outstanding
Common Stock (or such greater  amount as shall be permitted by  Applicable  Law,
including,  without  limitation,  the  BHC  Act)  after  giving  effect  to such
conversion,  assuming the  conversion  by such holder and its  affiliates of all
securities  convertible  into Common Stock owned by them and the exercise by the
holder and its affiliates of all warrants,  options and rights to acquire Common
Stock and without giving effect to the exercise of such convertible  securities,
options, warrants or rights by any other party, in form and substance reasonably
acceptable to the Corporation.

         Such  conversion  right may be exercised as to any portion of Nonvoting
Common Stock held by a holder by delivering to the  Corporation  during  regular
business  hours,  at the office of the  Corporation or any transfer agent of the
Corporation for the Common Shares as may be designated by the  Corporation,  the
certificate  or  certificates  for the shares to be converted,  duly endorsed or
assigned in blank or to the  Corporation  (if  required by it),  accompanied  by
written  notice  stating  that such  holder  elects to convert  such shares into
Common Stock,  specifying  the number of shares of Common Stock to be issued and
stating  the  name  or  names  (with  address)  in  which  the   certificate  or
certificates for such shares of Common Stock are to be issued.  Conversion shall
be deemed to have been effected on the date when the aforesaid delivery is made.
As  promptly  as is  practicable  thereafter,  the  Corporation  shall issue and
deliver to such  holder,  or upon the written  order of such holder to the place
designated  by such holder,  a certificate  or  certificates  representing  that
number of shares of Common  Stock to which such  holder is  entitled;  provided,
however,  that, upon reasonable  request by the  Corporation,  as a condition to
such  issuance  and  delivery of shares of Common Stock to any person other than
such  holder,  such  holder  shall have  provided  to the  Corporation  evidence
reasonably  satisfactory to the  Corporation  that such transfer shall have been
consummated  in  accordance  with  Applicable  Law. The person in whose name the
certificate or certificates  representing Common Stock are to be issued shall be
deemed  to have  become  a Common  Stock  holder  of  record  on the  applicable
conversion  date unless the transfer books of the Corporation are closed on that
date,  in which event such holder  shall be deemed to have become a Common Stock
holder of record on the next  succeeding  date on which the  transfer  books are
open.  Upon  conversion  of only a portion of the number of shares  covered by a
certificate  representing  shares of  Nonvoting  Common  Stock  surrendered  for
conversion,  the  Corporation  shall  issue and deliver to such  holder,  at the
expense of the Corporation,  a new certificate  covering the number of shares of
the  Nonvoting  Common  Stock  representing  the  unconverted   portion  of  the
certificate so surrendered.

         D.        PREFERRED STOCK.

         Authority is hereby  expressly  granted to the Board of Directors  from
time to time to issue the Preferred  Stock in one or more classes or series and,
in  connection  with the  creation  of any such class or  series,  to fix by the
resolution  or  resolutions  providing  for the  issue  of  shares  thereof  the
designation, voting powers, preferences, and relative, participating,  optional,
or other  special  rights  of such  class  or  series,  and the  qualifications,
limitations,  or restrictions  thereof. Such authority of the Board of Directors
with respect to each such class or series shall include,  but not be limited to,
the determination of the following:


<PAGE>


                                       -7-


                  (a) The  distinctive  designation of, and the number of shares
         comprising, such class or series, which number may be increased (except
         where  otherwise  provided by the Board of Directors  in creating  such
         class or  series)  or  decreased  (but not below  the  number of shares
         thereof then outstanding) from time to time by like action of the Board
         of Directors  without  stockholder  approval  (including the holders of
         such class or series of Preferred Stock);

                  (b) The dividend rate or amount for such class or series,  the
         conditions  and dates upon which such dividends  shall be payable,  the
         form in which such dividends shall be payable,  the relation which such
         dividends  shall bear to the  dividends  payable on any other  class or
         classes or any other  series of the same or any other  class or classes
         of stock, and whether or not such dividends shall be cumulative, and if
         so, from which date or dates for such class or series;

                  (c) Whether or not the shares of such class or series shall be
         subject to redemption by the Corporation or the holders thereof and the
         times, prices, and other terms and conditions of such redemption;

                  (d) Whether or not the shares of such series  shall be subject
         to the  operation of a sinking  fund or purchase  fund to be applied to
         the  redemption  or  purchase  of  such  shares  and if  such a fund be
         established,  the amount thereof and the terms and provisions  relative
         to the application thereof;

                  (e)  Whether  or not  the  shares  of  such  series  shall  be
         convertible  into or  exchangeable  for  shares of any  other  class or
         classes,  or of any other  series of any class or classes,  of stock of
         the  Corporation  or any  other  Entity  and if  provision  be made for
         conversion or exchange,  the times,  prices,  rates,  adjustments,  and
         other terms and conditions of such conversion or exchange;

                  (f)  Whether or not the  shares of such class or series  shall
         have voting rights,  in addition to the voting rights  provided by Law,
         and if they are to have  such  additional  voting  rights,  the  extent
         thereof;

                  (g) The  rights of the  shares of such  class or series in the
         event of any  voluntary or  involuntary  liquidation,  dissolution,  or
         winding up of the  Corporation or upon any  distribution of its assets,
         and the relative rights of priority, if any, of payment of such shares;
         and

                  (h)   Any   other   powers,    preferences,    and   relative,
         participating,  optional, or other special rights of the shares of such
         class or series, and the qualifications,  limitations,  or restrictions
         thereof,  to the full extent now or hereafter  permitted by  Applicable
         Law and not  inconsistent  with the rights or  provisions  of any other
         class or series of Common Shares or Preferred Stock of the Corporation.



<PAGE>


                                       -8-

         FIFTH:  For the  management  of the business and for the conduct of the
affairs of the Corporation, and in further definition, limitation and regulation
of the powers of the  Corporation and of its directors and  stockholders,  it is
further provided that:

         1. Powers of the Board of  Directors.  The  business and affairs of the
Corporation  shall  be  managed  by or  under  the  direction  of the  Board  of
Directors.  In  addition  to the  powers  and  authorities  herein or by statute
expressly conferred upon it, the Board of Directors may exercise all such powers
and do all such acts and things as may be exercised or done by the  Corporation,
subject,  nevertheless,  to the provisions of the laws of the State of Delaware,
this Certificate of Incorporation and the By-Laws of the Corporation.  Except as
otherwise provided by the Delaware General Corporation Law, any committee of the
Board of Directors  shall have and may exercise,  to the extent  provided in the
By-Laws of the Corporation or by the resolutions of the Board of Directors,  all
of the powers and authority of the Board of Directors of the  Corporation in the
management of the business and affairs of the Corporation.

         2. Number and Terms of Directors.  Subject to the rights of the holders
of  shares  of any  class or  series  of  Preferred  Stock  to elect  additional
Directors  under  specified  circumstances,  the  number  of  Directors  of  the
Corporation  shall be fixed by the Board of Directors of the Corporation and may
be  increased  or  decreased  from  time  to time  in  such a  manner  as may be
prescribed by the By-Laws.

                  The Directors  shall be divided into three classes,  as nearly
equal in number as possible.  One class of Directors has been initially  elected
for a term expiring at the annual  meeting of  stockholders  to be held in 1996,
another  class has been  initially  elected  for a term  expiring  at the annual
meeting of stockholders to be held in 1997, and another class has been initially
elected for a term expiring at the annual meeting of  stockholders to be held in
1998,  with  members of each class to hold  office  until their  successors  are
elected and qualified.  At each succeeding annual meeting of the stockholders of
the Corporation,  the successors of the class of Directors whose term expires at
that  meeting  shall be  elected  by  plurality  vote of all votes  cast at such
meeting to hold office for a term expiring at the annual meeting of stockholders
held in the third year following the year of their election.

         3.  Newly   Created   Directorships   and   Vacancies.   Newly  created
directorships  resulting from any increase in the authorized number of directors
or any vacancy in the Board of  Directors  resulting  from  death,  resignation,
retirement,  disqualification,  removal from office or otherwise shall be filled
only by a majority  vote of the  directors  then in office,  though  less than a
quorum, or by a sole remaining director, or, if no directors remain, then by the
stockholders of the Corporation, and directors so chosen shall hold office for a
term expiring at the next election of the class for which such Director has been
chosen. No decrease in the authorized number of directors shall shorten the term
of any incumbent director.

         4.  Election and  Nominations  of  Directors.  Unless and except to the
extent  that the ByLaws of the  Corporation  shall so require,  the  election of
directors of the Corporation  need not be by written ballot.  Directors need not
be stockholders.  Advance notice of stockholder  nominations for the election of
Directors and advance notice of business to be brought by stockholders before an
annual  meeting  shall be given in the  manner  provided  in the  By-Laws of the
Corporation.


<PAGE>


                                       -9-


         5. Removal of Directors. Subject to the rights of the holders of shares
of any class or series of  Preferred  Stock,  any  Director  may be removed from
office by the  stockholders  in the manner provided in this Section 5 of Article
FIFTH.  At any annual meeting of the  stockholders  of the Corporation or at any
special  meeting of the  stockholders  of the  Corporation,  the notice of which
shall state that the removal of a Director or Directors is among the purposes of
the meeting,  the affirmative  vote of the holders of at least 80 percent of the
combined  voting power of the stock of the  Corporation  entitled to vote in the
election of Directors  generally,  voting together as a single class, may remove
such Director or Directors only for cause.

         6. No Action By Written Consent of Stockholders.  Subject to the rights
of the holders of shares of any class or series of Preferred Stock in respect of
actions  to be taken by the  holders of such  shares,  any  action  required  or
permitted to be taken by the stockholders of the Corporation must be effected at
a duly called annual or special  meeting of  stockholders of the Corporation and
may not be effected by any consent in writing by the stockholders.

         7.  Stockholders'  Meetings.  Subject to the  rights of the  holders of
shares of any class or series of  Preferred  Stock in respect of meetings of the
holders of such  shares,  meetings of  stockholders  of the  Corporation  may be
called only by the Chairman of the Board of  Directors,  if any, or the Board of
Directors  pursuant to a  resolution  adopted by  majority  vote of the Board of
Directors.

         8. Rights of Preferred Stock.  Notwithstanding the foregoing,  whenever
the  holders  of any class or series of  Preferred  Stock  shall have the right,
voting separately by class or series, to elect directors at an annual or special
meeting of stockholders,  the election, term of office, filling of vacancies and
other  features  of such  directorships  shall be  governed by the terms of this
Certificate of Incorporation specifically applicable thereto.

         Notwithstanding anything contained in this Certificate of Incorporation
to the contrary, the affirmative vote of at least 80 percent of the voting power
of the stock of the  Corporation  entitled to vote in the  election of Directors
generally, voting together as a single class, shall be required to amend, repeal
or adopt any provision inconsistent with this Article FIFTH.

         SIXTH:

         1.  Indemnification   Other  than  Actions  by  or  on  Behalf  of  the
Corporation.  The  Corporation  shall indemnify and hold harmless to the fullest
extent  permitted by Applicable Law, as it presently  exists or may hereafter be
amended, any person who was or is a party or is threatened to be made a party to
any threatened,  pending or completed action, suit or proceeding, whether civil,
criminal,  administrative  or  investigative  (other than an action by or in the
right of the  Corporation),  by  reason  of the fact  that he or she is or was a
director,  trustee, officer, employee or agent of the Corporation,  or is or was
serving at the  request of the  Corporation  as a  director,  partner,  trustee,
officer,  employee or agent of another  Entity  against all  liability,  losses,
expenses  (including  attorneys'  fees),  judgments,  fines and amounts  paid in
settlement  actually and  reasonably  incurred by him or her in connection  with
such action, suit or proceeding if he or she 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


<PAGE>


                                      -10-

Corporation,  and,  with respect to any criminal  action or  proceeding,  had no
reasonable cause to believe his or her conduct was unlawful.  The termination of
any action,  suit or proceeding by judgment,  order,  settlement,  conviction or
upon a plea of nolo contendere or its equivalent, shall not, of itself, create a
presumption  that the person did not act in good faith and in a manner  which he
or she  reasonably  believed to be in or not opposed to the best interest of the
Corporation,  and,  with  respect  to any  criminal  action or  proceeding,  had
reasonable cause to believe that his or her conduct was unlawful.

         2.  Indemnification in Actions by or on Behalf of the Corporation.  The
Corporation shall indemnify any person who was or is a party or is threatened to
be made a party to any threatened,  pending or completed action or suit by or in
the right of the Corporation to procure a judgment in its favor by reason of the
fact that he or she is or was a director, trustee, officer, employee or agent of
the  Corporation,  or is or was serving at the request of the  Corporation  as a
director, partner, trustee, officer, employee or agent of another Entity against
expenses (including  attorneys' fees) actually and reasonably incurred by him or
her in connection with the defense or settlement of such action or suit if he or
she 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  Corporation  and except  that no
indemnification  shall be made in respect  of any  claim,  issue or matter as to
which such  person  shall  have been  adjudged  to be liable to the  Corporation
unless  and only to the  extent  that  the  Court of  Chancery  of the  State of
Delaware or the court in which such action or suit was brought  shall  determine
upon application that,  despite the adjudication of liability but in view of all
the circumstances of the case, such person is fairly and reasonably  entitled to
indemnity for such expenses which the Court of Chancery of the State of Delaware
or such other court shall deem proper.

         3.  Additional  Indemnification  as to Expenses.  Without  intending to
limit the  generality  of the  indemnification  provided  in Sections 1 and 2 of
Article SIXTH and in addition thereto, to the extent that any person referred to
in Sections 1 and 2 of this Article  SIXTH has been  successful on the merits or
otherwise in defense of any action,  suit or proceeding  referred to therein, or
in defense of any claim, issue or matter therein, he or she shall be indemnified
against expenses (including attorneys' fees) actually and reasonably incurred by
him or her in connection therewith.

         4. Authorization.  Any  indemnification  under Sections 1 and 2 of this
Article SIXTH (unless ordered by a court) shall be made by the Corporation  only
as authorized in the specific case upon a determination that  indemnification of
the  director,  trustee,  partner,  officer,  employee or agent is proper in the
circumstances  because he or she has met the applicable  standard of conduct set
forth in such Sections 1 and 2 of this Article SIXTH. Such  determination  shall
be made (i) by a  majority  vote of the  directors  who are not  parties to such
action, suit or proceeding, even though less than a quorum, (ii) if there are no
such directors,  or if such directors so direct, by independent legal counsel in
a written opinion, or (iii) by the stockholders.

         5. Expense Advance. Expenses (including attorneys' fees) incurred by an
officer or  director  of the  Corporation  in  defending  any  civil,  criminal,
administrative or investigative  action, suit or proceeding shall be paid by the
Corporation  in  advance  of the  final  disposition  of  such  action,  suit or
proceeding  upon receipt of an  undertaking  by or on behalf of such director or
officer to repay such amount if it shall ultimately be determined that he or she
is not entitled to be  indemnified  by the  Corporation  as  authorized  in this
Article SIXTH. Such expenses (including attorneys' fees)


<PAGE>


                                      -11-

incurred by other persons  referred to in Sections 1 and 2 of this Article SIXTH
may be so paid upon such terms and conditions, if any, as the Board of Directors
deems appropriate.

         6.  Nonexclusivity.  The  indemnification  and  advancement of expenses
provided by, or granted  pursuant to, the other paragraphs of this Article SIXTH
shall  not be  deemed  exclusive  of any other  rights  to which  those  seeking
indemnification  or  advancement  of expenses may be entitled under any statute,
by-law, agreement, vote of stockholders or disinterested directors or otherwise,
both as to action in his or her  official  capacity  and as to action in another
capacity while holding such office.

         7.  Insurance.  The  Corporation  shall have the power to purchase  and
maintain  insurance  on behalf of any person who is or was a director,  trustee,
officer,  employee  or agent of the  Corporation,  or is or was  serving  at the
request of the Corporation as a director, trustee, partner, officer, employee or
agent of another  corporation,  partnership,  limited liability  company,  joint
venture, trust or other enterprise against any liability asserted against him or
her and  incurred by him or her in any such  capacity,  or arising out of his or
her  status as such,  whether  or not the  Corporation  would  have the power to
indemnify  such person  against  such  liability  under the  provisions  of this
Article SIXTH.

         8. "The Corporation". For purposes of this Article SIXTH, references to
"the  Corporation"  include,  in  addition  to the  resulting  Corporation,  any
constituent corporation (including any constituent of a constituent) absorbed in
a consolidation or merger which, if its separate existence had continued,  would
have had power and authority to indemnify  its  directors,  officers,  trustees,
employees  or  agents  so that any  person  who is or was a  director,  officer,
trustee, employee or agent of such constituent corporation, or is or was serving
at the request of such constituent corporation as a director,  trustee, partner,
officer,  employee or agent of another  Entity shall stand in the same  position
under the  provisions  of this Article  SIXTH with  respect to the  resulting or
surviving  corporation as he or she would have with respect to such  constituent
corporation if its separate existence had continued.

         9. "Other Enterprises".  For purposes of this Article SIXTH, references
to "other  enterprises"  or "entities"  shall include  employee  benefit  plans;
references to "fines"  shall include any excise taxes  assessed on a person with
respect to an employee  benefit plan;  and references to "serving at the request
of the Corporation" shall include any service as a director,  trustee,  officer,
employee  or agent of the  Corporation  which  imposes  duties  on, or  involves
services by, such director, trustee, officer, employee, or agent with respect to
an employee benefit plan, its participants,  or beneficiaries;  and a person who
acted in good faith and in a manner he or she  reasonably  believed to be in the
interest of the participants and beneficiaries of an employee benefit plan shall
be deemed to have acted in a manner "not  opposed to the best  interests  of the
Corporation" as referred to in this Article SIXTH.

         10.   Continuation  of   Indemnification.   The   indemnification   and
advancement of expenses  provided by, or granted pursuant to, this Article SIXTH
shall,  unless otherwise provided when authorized or ratified,  continue as to a
person who has ceased to be a director,  officer,  partner, trustee, employee or
agent and shall inure to the benefit of the heirs,  executors and administrators
of such a person.


<PAGE>


                                      -12-


         11. Other  Indemnification.  The Corporation's  obligation,  if any, to
indemnify  any  person  who was or is  serving  at its  request  as a  director,
trustee,  partner, officer, employee or agent of another Entity shall be reduced
by  any  amount  such  person  collects  as  indemnification   from  such  other
corporation,  partnership,  limited liability company,  joint venture,  trust or
other enterprise or from insurance.

         12. No  Amendment.  No  amendment or repeal of the  provisions  of this
Article SIXTH shall  adversely  affect any right or protection  hereunder of any
person in respect  of any act or  omission  occurring  prior to the time of such
amendment or repeal.

         SEVENTH:  A  director  of the  Corporation  shall  not be liable to the
Corporation  or its  stockholders  for monetary  damages for breach of fiduciary
duty as a director,  except to the extent that exculpation from liability is not
permitted  under the General  Corporation Law of Delaware as in effect when such
breach occurred.  Neither the amendment or repeal of this Article  SEVENTH,  nor
the adoption of any provision of this Certificate of Incorporation  inconsistent
with this Article  SEVENTH,  shall  eliminate,  reduce or  adversely  affect the
effect of this Article SEVENTH in respect of any act or omission  occurring,  or
any cause of action,  suit or claim that,  but for this Article  SEVENTH,  would
accrue or arise, prior to such amendment,  repeal or adoption of an inconsistent
provision.

         EIGHTH: In furtherance and not in limitation of the powers conferred by
the  Laws of the  State  of  Delaware,  the  Board  of  Directors  is  expressly
authorized  and empowered to amend,  alter,  change and repeal the By-Laws.  The
By-Laws of the Corporation may be amended,  altered,  changed or repealed, and a
provision or provisions  inconsistent with the provisions of the By-Laws as they
exist from time to time may be adopted, only by the majority of the entire Board
of Directors or with the approval of the holders of not less than  sixty-six and
two-thirds  percent  (662/3%) of the voting power of all  outstanding  shares of
capital stock of the  Corporation  entitled to vote generally in the election of
directors  (except that the affirmative vote of at least 80% of the voting power
of the capital  stock of the  Corporation  entitled  to vote in the  election of
Directors  generally,  voting  together as a single class,  shall be required to
amend,  repeal or adopt any provision  inconsistent  with the  provisions of the
By-Laws  establishing   classes  of  directors,   limiting  the  rights  of  the
stockholders  to remove or nominate  directors or bring  business  before annual
meetings  of  stockholders,  filling  vacancies  of the Board of  Directors  and
providing for limitations on calling special meetings of the stockholders).

         NINTH:  Except for the provisions in Articles FOURTH,  SIXTH,  SEVENTH,
AND EIGHTH,  and this Article NINTH,  none of which  provisions or authorization
shall be amended,  altered,  changed or repealed except with the approval of the
holders of not less than sixty-six and two-thirds percent (662/3%) of the voting
power of all outstanding shares of capital stock of the Corporation  entitled to
vote generally in the election of directors,  voting together as a single class,
and any other provisions  contained in this Certificate of Incorporation that by
their terms  require a higher vote,  the  Corporation  reserves the right at any
time and from time to time to amend,  alter,  change  or  repeal  any  provision
contained in this  Certificate  of  Incorporation  (including  provisions as may
hereafter  be  added  or  inserted  in  this  Certificate  of  Incorporation  as
authorized  by the Laws of the State of Delaware) in the manner now or hereafter
prescribed by Delaware General


<PAGE>


                                      -13-

Corporation  Law. All rights,  preferences  and privileges of whatsoever  nature
conferred  upon  stockholders,  directors or any other person  whomsoever by and
pursuant  to  this  Certificate  of  Incorporation  in its  present  form  or as
hereafter  amended are granted  subject to the rights  reserved in this  Article
NINTH.

         IN WITNESS  WHEREOF,  the Corporation has caused this Certificate to be
executed by its Chairman of the Board and Chief  Executive  Officer and attested
by its Assistant Secretary this 2nd day of February, 1996.

                                    IRON MOUNTAIN INCORPORATED


                                    By:   /s/ C. Richard Reese
                                          Name: C. Richard  Reese
                                          Title:  Chairman of the Board and
                                                     Chief Executive Officer
ATTEST:



By:  /s/ Garry B. Watzke
      Name:  Garry B. Watzke
      Title:    Assistant Secretary





                                                                     EXHIBIT 3.2












================================================================================
                              AMENDED AND RESTATED

                                    BY - LAWS

                                       of

                           Iron Mountain Incorporated

                            (a Delaware corporation)


================================================================================
                       as amended through January 6, 1998



<PAGE>



<TABLE>
<CAPTION>
                                TABLE OF CONTENTS

<S>                                                                                                              <C>
ARTICLE I    OFFICES..............................................................................................1
                  SECTION 1.          Registered Office.  ........................................................1
                  SECTION 2.          Other Offices.  ............................................................1

ARTICLE II    MEETING OF STOCKHOLDERS.............................................................................1
                  SECTION 1.          Place of Meeting............................................................1
                  SECTION 2.          Annual Meetings.  ..........................................................1
                  SECTION 3.          Special Meetings............................................................1
                  SECTION 4.          Introduction of Business At a Meeting of Stockholders.......................1
                  SECTION 5.          Notice......................................................................2
                  SECTION 6.          Quorum and Adjournments.....................................................3
                  SECTION 7.          Votes; Proxies.  ...........................................................3
                  SECTION 8.          Organization.  .............................................................4

ARTICLE III    DIRECTORS..........................................................................................4
                  SECTION 1.          Number......................................................................4
                  SECTION 2.          Nomination of Directors.....................................................5
                  SECTION 3.          Removal.....................................................................6
                  SECTION 4.          Vacancies...................................................................6
                  SECTION 5.          Meetings....................................................................6
                  SECTION 6.          Votes.......................................................................7
                  SECTION 7.          Quorum and Adjournment......................................................7
                  SECTION 8.          Compensation................................................................7
                  SECTION 9.          Action By Consent of Directors..............................................7

ARTICLE IV    COMMITTEES OF DIRECTORS.............................................................................7
                  SECTION 1.          Executive Committee.........................................................7
                  SECTION 2.          Audit Committee.............................................................8
                  SECTION 3.          Other Committees............................................................9
                  SECTION 4.          Term of Office..............................................................9

ARTICLE V    OFFICERS.............................................................................................9
                  SECTION 1.          Officers....................................................................9
                  SECTION 2.          Vacancies..................................................................10
                  SECTION 3.          Chairman of the Board......................................................10
                  SECTION 4.          President..................................................................10
                  SECTION 5.          Executive Vice Presidents, Senior Vice Presidents and
                                      Vice Presidents............................................................10
                  SECTION 6.          Secretary..................................................................10
                  SECTION 7.          Assistant Secretaries......................................................10
                  SECTION 8.          Treasurer..................................................................11
                  SECTION 9.          Assistant Treasurers.......................................................11
                  SECTION 10.         Controller.................................................................11
                  SECTION 11.         Assistant Controllers......................................................11
                  SECTION 12.         Subordinate Officers.......................................................11
                  SECTION 13.         Compensation...............................................................11


<PAGE>



                  SECTION 14.         Removal....................................................................11
                  SECTION 15.         Bonds......................................................................11

ARTICLE VI    CERTIFICATES OF STOCK..............................................................................12
                  SECTION 1.          Form and Execution of Certificates.........................................12
                  SECTION 2.          Transfer of Shares.........................................................12
                  SECTION 3.          Closing of Transfer Books..................................................13
                  SECTION 4.          Fixing Date for Determination of Stockholders of Record....................13
                  SECTION 5.          Lost or Destroyed Certificates.............................................13
                  SECTION 6.          Uncertificated Shares......................................................14
                  SECTION 7.          Transfer Agents and Registrars; Further Regulations.  .....................14

ARTICLE VII    EXECUTION OF DOCUMENTS............................................................................15
                  SECTION 1.          Execution of Checks, Notes, etc............................................15
                  SECTION 2.          Execution of Contracts, Assignments, etc...................................15
                  SECTION 3.          Execution of Proxies.......................................................15

ARTICLE VIII    INSPECTION OF BOOKS..............................................................................15

ARTICLE IX      FISCAL YEAR......................................................................................16

ARTICLE X       SEAL.............................................................................................16

ARTICLE XI      AMENDMENTS.......................................................................................16

ARTICLE XII     RESTRICTIONS ON TRANSFER OF CERTAIN SHARES
                       OF CAPITAL STOCK OF THE CORPORATION.......................................................16
                  SECTION 1.         Restrictions on Transfer....................................................16
                  SECTION 2.         Legend on Stock Certificates................................................17
                  SECTION 3.         Termination of Restrictions on Transfers....................................17

ARTICLE XIII    RESTRICTIONS ON TRANSFER OF CERTAIN SHARES
                       OF CAPITAL STOCK OF THE CORPORATION.......................................................17
                  SECTION 1.         Restrictions on Transfer....................................................17
                  SECTION 2.         Legend on Stock Certificates................................................18
</TABLE>




<PAGE>





                           Iron Mountain Incorporated

                            (a Delaware corporation)



                                     BY-LAWS



                                ARTICLE I OFFICE


         SECTION 1. Registered  Office. The registered office of the Corporation
shall be located in Dover,  County of Kent,  State of Delaware,  and the name of
the resident  agent in charge  thereof  shall be The  Prentice-Hall  Corporation
System, Inc.

         SECTION 2. Other Offices. The Corporation may also have offices at such
other places, within or without the State of Delaware, as the Board of Directors
may from time to time appoint or the business of the Corporation may require.

                       ARTICLE II MEETING OF STOCKHOLDERS


         SECTION 1. Place of Meeting. Meetings of the stockholders shall be held
either  within or without  the State of  Delaware  at such place as the Board of
Directors may fix from time to time.

         SECTION 2. Annual Meetings. The annual meeting of stockholders shall be
held for the election of directors on such date and at such time as the Board of
Directors may fix from time to time. Any other proper business may be transacted
at the annual meeting.

         SECTION 3. Special  Meetings.  Special meetings of the stockholders for
any purpose or purposes may be called only by the Chairman of the Board, if any,
or the Board of Directors pursuant to a resolution adopted by a majority vote of
the Board of Directors.

         SECTION 4. Introduction of Business At a Meeting of Stockholders. At an
annual  or  special  meeting  of  stockholders,  only  such  business  shall  be
conducted,  and only such  proposals  shall be acted  upon,  as shall  have been
properly  brought before such annual or special meeting of  stockholders.  To be
properly brought before an annual or special meeting of  stockholders,  business
must be (i) in the case of a special  meeting,  specified  in the  notice of the
special meeting (or any supplement  thereto) given by or at the direction of the
Board of Directors or otherwise properly brought before the meeting by the Board
of Directors, or (ii) in the case of an annual meeting,  properly brought before
the  meeting by or at the  direction  of the Board of  Directors,  or  otherwise
properly brought before the annual meeting by a stockholder.  For business to be
properly brought before an annual meeting of stockholders by a stockholder, the


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 2

stockholder must have given timely notice thereof in writing to the Secretary of
the Corporation.  To be timely,  a stockholder's  notice must be delivered to or
mailed and received at the principal  executive  offices of the  Corporation not
less than 45 days1 prior to the date of the annual meeting;  provided,  however,
that if less than 55 days' written notice or prior public disclosure of the date
of the annual  meeting is given or made to  stockholders  or to the  stockholder
proposing a matter,  notice by the stockholder to be timely must be so delivered
or received not later than the close of business on the 10th day  following  the
earlier  of (i) the day on which  such  notice  of the date of the  meeting  was
mailed to such  stockholder  or the  stockholders  generally  or (ii) the day on
which such public disclosure was made.

         A  stockholder's  notice  to the  Secretary  shall set forth as to each
matter  the   stockholder   proposes  to  bring  before  an  annual  meeting  of
stockholders  (i) a brief  description  of the  business  desired  to be brought
before the annual  meeting and the reasons for  conducting  such business at the
annual meeting,  (ii) the name and address,  as they appear on the Corporation's
books,  of the  stockholder  proposing such business and any other  stockholders
known by such  stockholder to be supporting  such proposal,  (iii) the class and
number  of  shares  of the  Corporation  which  are  beneficially  owned by such
stockholder  on  the  date  of  such  stockholder's  notice  and  by  any  other
stockholders  known by such  stockholder  to be supporting  such proposal on the
date of such  stockholder's  notice,  and  (iv)  any  material  interest  of the
stockholder in such proposal.

         Notwithstanding  anything in these By-Laws to the contrary, no business
shall be conducted at a meeting of  stockholders  except in accordance  with the
procedures  set forth in this Section 4. The Chairman of the meeting  shall,  if
the facts  warrant,  determine  and declare to the meeting that the business was
not  properly  brought  before the  meeting in  accordance  with the  procedures
prescribed by these By-Laws, and if he should so determine,  he shall so declare
to the meeting and any such  business  not properly  brought  before the meeting
shall not be transacted.

         The  foregoing   requirements   shall  be  in  addition  to  any  other
requirements imposed by applicable law or regulation.

         SECTION  5.  Notice.  Written  or  printed  notice of every  meeting of
stockholders,  annual or special,  stating the hour, date and place thereof, and
the purpose or purposes in general  terms for which the meeting is called shall,
not less than ten (10) days,  or such longer period as shall be provided by law,
the Certificate of Incorporation, these By-Laws, or otherwise, and not more than
sixty  (60)  days  before  such  meeting,  be  served  upon  or  mailed  to each
stockholder  entitled to vote thereat,  at the address of such stockholder as it
appears upon the stock records of the Corporation or, if such stockholder  shall
have filed with the Secretary of the  Corporation a written request that notices
be mailed to some other address, then to the address designated in such request.

- --------
1        Amended 5/1/96.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 3

         Notice  of  the  hour,  date,  place  and  purpose  of any  meeting  of
stockholders may be dispensed with if every stockholder entitled to vote thereat
shall attend either in person or by proxy and shall not, at the beginning of the
meeting,  object to the holding of such meeting because the meeting has not been
lawfully  called or convened,  or if every absent  stockholder  entitled to such
notice shall in writing, filed with the records of the meeting, either before or
after the holding thereof, waive such notice.

         SECTION 6. Quorum and Adjournments. Except as otherwise provided by law
or by the  Certificate of  Incorporation,  the presence in person or by proxy at
any meeting of  stockholders of the holders of a majority of the voting power of
the shares of the  capital  stock of the  Corporation  issued,  outstanding  and
entitled to vote thereat,  shall be requisite and shall constitute a quorum.  If
two or more classes of stock are  entitled to vote as separate  classes upon any
question,  then, in the case of each such class, a quorum for the  consideration
of  such  question  shall,  except  as  otherwise  provided  by  law  or by  the
Certificate of  Incorporation,  consist of a majority of the voting power of all
stock of that class issued,  outstanding  and entitled to vote. If a majority of
the  voting  power of shares of  capital  stock of the  Corporation  issued  and
outstanding  and entitled to vote thereat or, where a larger quorum is required,
such  quorum,  shall  not be  represented  at any  meeting  of the  stockholders
regularly  called,  the holders of a majority of the voting  power of the shares
present or represented by proxy and entitled to vote thereat shall have power to
adjourn  the  meeting to another  time,  or to another  time and place,  without
notice other than  announcement of adjournment at the meeting,  and there may be
successive  adjournments  for like cause and in like manner until the  requisite
amount  of  shares  entitled  to vote  at such  meeting  shall  be  represented;
provided,  however,  that if the  adjournment is for more than thirty (30) days,
notice of the hour,  date and place of the  adjourned  meeting shall be given to
each  stockholder  entitled to vote thereat.  Subject to the requirements of law
and the Certificate of Incorporation,  on any issue on which two or more classes
of stock are entitled to vote  separately,  no  adjournment  shall be taken with
respect to any class for which a quorum is present  unless the  Chairman  of the
meeting  otherwise  directs.  At any meeting held to consider matters which were
subject to  adjournment  for want of a quorum at which the  requisite  amount of
shares  entitled to vote  thereat  shall be  represented,  any  business  may be
transacted  which  might  have been  transacted  at the  meeting  as  originally
noticed.

         SECTION  7.  Votes;  Proxies.  Except  as  otherwise  provided  in  the
Certificate of Incorporation, at each meeting of stockholders, every stockholder
of record at the closing of the transfer books, if closed, or on the date set by
the Board of Directors for the determination of stockholders entitled to vote at
such meeting, shall have one vote for each share of stock entitled to vote which
is registered in such stockholder's name on the books of the Corporation.

         At each  such  meeting  every  stockholder  entitled  to vote  shall be
entitled to do so in person,  or by proxy  appointed by an instrument in writing
or as otherwise  permitted by law subscribed by such  stockholder  and bearing a
date not more than three (3) years prior to the meeting in question, unless said
instrument provides for a longer period during which it is to remain in force. A
duly executed proxy shall be irrevocable if it states that it is irrevocable and
if, and only as long as, it is coupled  with an  interest  sufficient  in law to
support an  irrevocable  power.  A proxy may be made  irrevocable  regardless of
whether the interest with which it is


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 4

coupled is an interest in the stock  itself or any  interest in the  Corporation
generally.  A  stockholder  may revoke  any proxy  which is not  irrevocable  by
attending  the meeting and voting in person or by filing with the  Secretary  of
the  Corporation  an  instrument  in writing or as  otherwise  permitted  by law
revoking the proxy or another duly executed proxy bearing a later date.

         Voting at meetings of  stockholders  need not be by written ballot and,
except as otherwise  provided by law,  need not be conducted  by  inspectors  of
election  unless so  determined by the Chairman of the meeting or by the holders
of shares of stock  having a majority  of the votes  which  could be cast by the
holders of all  outstanding  shares of stock  entitled to vote thereon which are
present in person or represented by proxy at such meeting.  If it is required or
determined that inspectors of election be appointed,  the Chairman shall appoint
two or more  inspectors of election,  who shall first take and subscribe an oath
or  affirmation  faithfully  to execute the duties of inspectors at such meeting
with  strict  impartiality  and  according  to the  best of their  ability.  The
inspectors so appointed shall take charge of the polls and, after the balloting,
shall  make a  certificate  of the  result of the vote  taken.  No  director  or
candidate for the office of director shall be appointed as such inspector.

         At any meeting at which a quorum is present,  a plurality  of the votes
properly  cast for election to fill any vacancy on the Board of Directors  shall
be sufficient  to elect a candidate to fill such vacancy,  and a majority of the
votes properly cast upon any other question shall decide the question, except in
any  case  where  a  larger  vote  is  required  by  law,  the   Certificate  of
Incorporation, these By-Laws, or otherwise.

         SECTION 8. Organization. The Chairman of the Board, if there be one, or
in his or her absence the Vice  Chairman,  or in the absence of a Vice Chairman,
the President, or in the absence of the President, a Vice President,  shall call
meetings of the  stockholders  to order and shall act as chairman  thereof.  The
Secretary of the Corporation, if present, shall act as secretary of all meetings
of stockholders, and, in his or her absence, the presiding officer may appoint a
secretary.

                              ARTICLE III DIRECTORS


         SECTION 1. Number. The business and affairs of the Corporation shall be
conducted  and  managed  by a Board  of  Directors,  none of whom  needs to be a
stockholder.  The number of directors  for each year shall be fixed by the Board
of Directors (and not by the  stockholders)  from time to time, but shall not be
less than three nor more than  fifteen  persons.  If the number is not so fixed,
the number shall remain as it stood immediately prior to such meeting.

         The  directors,  other than those who may be elected by the  holders of
any class or series of stock  having a  preference  over the Common  Stock as to
dividends or upon  liquidation,  shall be divided,  with respect to the time for
which they severally hold office,  into three classes, as nearly equal in number
as  possible,  as  determined  by the Board of  Directors.  One class shall hold
office initially for a term expiring at the annual meeting of stockholders to be
held in 1996,  another class to hold office initially for a term expiring at the
annual  meeting  of  stockholders  in 1997,  and  another  class to hold  office
initially for a term expiring at the annual meeting of


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 5

stockholders  to be held in 1998,  with each member of each class to hold office
until his or her successor is elected and qualified, or until his or her earlier
death,  resignation  or  removal.  At  each  succeeding  annual  meeting  of the
stockholders of the Corporation,  the successors of the class of directors whose
term expires at that meeting  shall be elected by plurality  vote to hold office
for a term  expiring at the annual  meeting for  stockholders  held in the third
year following the year of their election.

         At any time during any year,  except as otherwise  provided by law, the
Certificate of  Incorporation  or these By-Laws,  the number of directors may be
increased  or reduced,  in each case by vote of a majority of the  directors  in
office at the time of such  increase or  decrease,  regardless  of whether  such
majority  constitutes a quorum,  provided that no such decrease shall affect the
term of any director then in office.

         SECTION  2.  Nomination  of  Directors.   Only  persons   nominated  in
accordance with the procedures set forth in this Section 2 shall be eligible for
election  as  directors.  Nominations  of persons  for  election to the Board of
Directors may be made at a meeting of stockholders (i) by or at the direction of
the Board of Directors,  or (ii) by any stockholder of the Corporation  entitled
to vote for the election of  directors  at such  meeting who  complies  with the
notice  procedures  set forth in this  Section 2. Such  nominations,  other than
those made by or at the direction of the Board, shall be made pursuant to timely
notice  in  writing  to  the  Secretary  of the  Corporation.  To be  timely,  a
stockholder's  notice  must  be  delivered  to or  mailed  and  received  at the
principal  executive  offices of the Corporation not less than 45 days2 prior to
the date of a meeting;  provided,  however,  that if fewer than 55 days' written
notice or prior public disclosure of the date of the meeting is given or made to
stockholders  or to the  stockholder  proposing  a  director  or  directors  for
election,  notice  by the  stockholder  to be  timely  must be so  delivered  or
received  not later than the close of  business  on the 10th day  following  the
earlier  of (i) the day on which  such  notice of the date of such  meeting  was
mailed to such  stockholder or  stockholders  generally or (ii) the day on which
such public disclosure was made.

         A stockholder's  notice to the Secretary shall set forth (i) as to each
person whom the stockholder proposes to nominate for election or reelection as a
director  (a) the name,  age,  business  address and  residence  address of such
person, (b) the principal occupation or employment of such person, (c) the class
and number of shares of the  Corporation  which are  beneficially  owned by such
person on the date of such  stockholder's  notice and (d) any other  information
relating to such person that is required to be  disclosed  in  solicitations  of
proxies for  election  of  directors,  or is  otherwise  required,  in each case
pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended
(including  without  limitation such person's  written consent to being named in
the proxy  statement as a nominee and to serving as a director if elected),  and
(ii) as to the stockholder giving the notice, (a) the name and address,  as they
appear  on  the   Corporation's   books,  of  such  stockholder  and  any  other
stockholders  known by such  stockholder to be supporting  such nominees and (b)
the class and number of shares of the Corporation  which are beneficially  owned
by such stockholder on the date of such stockholder's
- --------
2        Amended 5/1/96.


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By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 6

notice and by any other  stockholders known by such stockholder to be supporting
such nominees on the date of such stockholder's notice.

         No  person  shall  be  eligible  for  election  as a  director  of  the
Corporation unless nominated in accordance with the procedures set forth in this
Section 2. The Chairman of the meeting shall,  if the facts  warrant,  determine
and declare to the meeting that a nomination was not made in accordance with the
procedures prescribed by the By-Laws, and if he should so determine, he shall so
declare to the meeting and the defective nomination shall be disregarded.

         The  foregoing   requirements   shall  be  in  addition  to  any  other
requirements imposed by applicable law or regulation.

         SECTION 3.  Removal.  Subject to the rights of the holders of any class
or series of stock having a preference  over the Common Stock as to dividends or
upon  liquidation to elect additional  directors under specified  circumstances,
any  director  may be  removed  from  office by the  stockholders  in the manner
provided  in this  Section  3 of  Article  III.  At any  annual  meeting  of the
stockholders of the Corporation or at any special meeting of the stockholders of
the Corporation,  the notice of which shall state that the removal of a director
or directors is among the purposes of the meeting,  the affirmative  vote of the
holders of at least 80 percent of the combined  voting power of the  outstanding
shares of capital stock of the  Corporation  entitled to vote in the election of
directors generally, voting together as a single class, may remove such director
or directors only for cause.

         SECTION 4.  Vacancies.  If any vacancy shall occur among the directors,
or if the number of directors shall at any time be increased, such vacancy shall
be filled only by the directors then in office,  although less than a quorum, by
a  majority  vote of the  directors  then in  office  or by the  sole  remaining
director,  or,  if  no  directors  then  remain,  by  the  stockholders  of  the
Corporation.

         SECTION 5. Meetings.  Meetings of the Board of Directors  shall be held
at such place, within or without the State of Delaware, as may from time to time
be fixed by  resolution  of the Board of  Directors  or by the  Chairman  of the
Board,  if there be one, or by the  President,  and as may be  specified  in the
notice or waiver of notice of any meeting. Meetings may be held at any time upon
the call of the Chairman of the Board,  if there be one, or the President or any
two (2) of the  directors  in office by oral,  telegraphic,  telex,  telecopy or
other form of electronic transmission, or written notice, duly served or sent or
mailed to each  director  not less  than  twenty-four  (24)  hours  before  such
meeting,  except that, if mailed,  not less than  seventy-two  (72) hours before
such meeting.

         Meetings  may be held at any time and place  without  notice if all the
directors  are present and do not object to the holding of such meeting for lack
of proper  notice or if those not  present  shall,  in writing  or by  telegram,
telex, telecopy or other form of electronic  transmission,  waive notice thereof
before or after the meeting.  A regular meeting of the Board may be held without
notice  immediately  following the annual meeting of  stockholders  at the place
where  such  meeting  is held.  Regular  meetings  of the Board may also be held
without notice at such time and place


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 7

as shall from time to time be determined  by resolution of the Board.  Except as
otherwise  provided by law,  the  Certificate  of  Incorporation  or  otherwise,
neither  the  business to be  transacted  at, nor the purpose of, any regular or
special  meeting of the Board of  Directors  or any  committee  thereof  need be
specified in any written waiver of notice.

         Members  of the  Board  of  Directors  or  any  committee  thereof  may
participate  in a meeting  of such  Board or  committee  by means of  conference
telephone  or similar  communications  equipment  by means of which all  persons
participating in the meeting can hear each other and  participation in a meeting
pursuant to the foregoing  provisions shall constitute presence in person at the
meeting.

         SECTION 6. Votes.  Except as otherwise provided by law, the Certificate
of  Incorporation  or these  By-Laws,  the vote of the majority of the directors
present at a meeting at which a quorum is present  shall be the act of the Board
of Directors.

         SECTION 7. Quorum and Adjournment. Except as otherwise provided by law,
the Certificate of Incorporation  or these By-Laws,  a majority of the directors
shall constitute a quorum for the transaction of business.  If at any meeting of
the Board there shall be less than a quorum present, a majority of those present
may adjourn the meeting from time to time without notice other than announcement
of the  adjournment  at the meeting,  and at such  adjourned  meeting at which a
quorum  is  present  any  business  may be  transacted  which  might  have  been
transacted at the meeting as originally noticed.

         SECTION 8. Compensation.  Directors may receive  compensation for their
services,  as such,  and for service on any committee of the Board of Directors,
as fixed by  resolution of the Board of Directors and for expenses of attendance
at each  regular  or  special  meeting  of the Board or any  Committee  thereof.
Nothing in this Section  shall be construed to preclude a director  from serving
the Corporation in any other capacity and receiving compensation therefor.

         SECTION 9.  Action By  Consent of  Directors.  Any action  required  or
permitted  to be taken  at any  meeting  of the  Board  of  Directors  or of any
committee  thereof may be taken without a meeting if all members of the Board or
committee,  as the case may be, consent  thereto in writing,  and the writing or
writings are filed with the minutes of  proceedings  of the Board or  committee.
Such consent  shall be treated as a vote adopted at a meeting for all  purposes.
Such consents may be executed in one or more counterparts and not every Director
or committee member need sign the same counterpart.

                       ARTICLE IV COMMITTEES OF DIRECTORS


         SECTION  1.  Executive  Committee.  The  Board  of  Directors  may,  by
resolution  passed  by a  majority  of the whole  Board,  appoint  an  Executive
Committee of two (2) or more members, to serve during the pleasure of the Board,
to consist of such directors as the Board may from time to time  designate.  The
Board of Directors shall designate the Chairman of the Executive Committee.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 8


         a.       Procedure.  The  Executive  Committee  shall,  by a vote  of a
                  majority  of its  members,  fix its own  times  and  places of
                  meeting,  determine the number of its members  constituting  a
                  quorum for the transaction of business,  and prescribe its own
                  rules of procedure, no change in which shall be made save by a
                  majority vote of its members.

         b.       Responsibilities. During the intervals between the meetings of
                  the Board of  Directors,  except as otherwise  provided by the
                  Board  of  Directors  in   establishing   such   Committee  or
                  otherwise,  the  Executive  Committee  shall  possess  and may
                  exercise  all the  powers of the Board in the  management  and
                  direction  of the  business  and  affairs of the  Corporation;
                  provided,  however,  that the Executive  Committee  shall not,
                  except to the extent otherwise  provided in the Certificate of
                  Incorporation  or a resolution  providing  for the issuance of
                  shares of stock  adopted by the Board of Directors as provided
                  in Section 151(a) of the Delaware General Business Corporation
                  Law, have the power:

                           (1)  to  amend  or  authorize  the  amendment  of the
                           Certificate of Incorporation or these By-Laws;

                           (2) to authorize the issuance of stock;

                           (3) to authorize the payment of any dividend;

                           (4) to adopt an agreement of merger or  consolidation
                           of   the   Corporation   or  to   recommend   to  the
                           stockholders  the sale,  lease or  exchange of all or
                           substantially  all the  property  and business of the
                           Corporation;

                           (5) to recommend to the  stockholders  a dissolution,
                           or a revocation of a dissolution, of the Corporation;
                           or

                           (6) to adopt a  certificate  of ownership  and merger
                           pursuant  to  Section  253 of the  Delaware  Business
                           Corporation Law.

         c.       Reports. The Executive Committee shall keep regular minutes of
                  its  proceedings,  and all action by the  Executive  Committee
                  shall be  reported  promptly to the Board of  Directors.  Such
                  action shall be subject to review, amendment and repeal by the
                  Board,  provided  that no  rights  of third  parties  shall be
                  adversely affected by such review, amendment or repeal.

         SECTION 2. Audit  Committee.  The Board of Directors may, by resolution
passed by a majority of the whole Board,  appoint an Audit  Committee of two (2)
or more  members  who shall not be officers  (the  Chairman of the Board and the
Vice Chairman of the Board,  if any, not being deemed officers for this purpose)
or employees of the Corporation to serve during the


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 9

pleasure of the Board.  The Board of Directors  shall  designate the Chairman of
the Audit Committee.

         a.       Procedure. The Audit Committee, by a vote of a majority of its
                  members,  shall fix its own times and places of meeting, shall
                  determine the number of its members  constituting a quorum for
                  the transaction of business, and shall prescribe its own rules
                  of  procedure,  no  change  in which  shall be made  save by a
                  majority vote of its members.

         b.       Responsibilities.  The Audit Committee shall review the annual
                  financial   statements  of  the  Corporation  prior  to  their
                  submission to the Board of  Directors,  shall consult with the
                  Corporation's   independent  auditors,  and  may  examine  and
                  consider  such other  matters in relation to the  internal and
                  external audit of the  Corporation's  accounts and in relation
                  to the financial  affairs of the Corporation and its accounts,
                  including the selection and retention of independent auditors,
                  as the Audit Committee may, in its discretion, determine to be
                  desirable.

         c.       Reports. The Audit Committee shall keep regular minutes of its
                  proceedings, and all action by the Audit Committee shall, from
                  time to time,  be  reported  to the Board of  Directors  as it
                  shall  direct.   Such  action  shall  be  subject  to  review,
                  amendment and repeal by the Board,  provided that no rights of
                  third  parties  shall be  adversely  affected by such  review,
                  amendment or repeal.

         SECTION 3. Other Committees.  The Board of Directors may, by resolution
passed by a majority of the whole  Board,  at any time appoint one or more other
committees  from its own number.  Every such committee must include at least one
member of the Board of Directors.  The Board may from time to time  designate or
alter,  within the limits permitted by law, the Certificate of Incorporation and
this Article,  if applicable,  the duties,  powers and number of members of such
other  committees or change their  membership,  and may at any time abolish such
other committees or any of them.

         a.       Procedure.  Each committee  appointed pursuant to this Section
                  shall,  by a vote of a majority  of its  members,  fix its own
                  times  and  places of  meeting,  determine  the  number of its
                  members constituting a quorum for the transaction of business,
                  and prescribe  its own rules of procedure,  no change in which
                  shall be made save by a majority vote of its members.

         b.       Responsibilities.  Each committee  appointed  pursuant to this
                  Section shall exercise the powers  assigned to it by the Board
                  of Directors in its discretion.

         c.       Reports.  Each  committee  appointed  pursuant to this Section
                  shall keep regular minutes of  proceedings,  and all action by
                  each such committee  shall,  from time to time, be reported to
                  the Board of Directors as it shall  direct.  Such action shall
                  be  subject  to  review,  amendment  and  repeal by the Board,
                  provided  that no rights of third  parties  shall be adversely
                  affected by such review, amendment or repeal.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 10


         SECTION 4. Term of Office. Each member of a committee shall hold office
until the first meeting of the Board of Directors  following the annual  meeting
of  stockholders  (or  until  such  other  time as the  Board of  Directors  may
determine,  either in the vote  establishing the committee or at the election of
such  member or  otherwise)  and  until  his or her  successor  is  elected  and
qualified,  or until he or she sooner dies,  resigns, is removed, is replaced by
change of membership or becomes  disqualified by ceasing to be a director (where
membership on the Board is required), or until the committee is sooner abolished
by the Board of Directors.

                               ARTICLE V OFFICERS


         SECTION 1. Officers.  The Board of Directors shall elect a President, a
Secretary and a Treasurer, and, in their discretion, may elect a Chairman of the
Board,  a Vice Chairman of the Board,  a Controller,  and one or more  Executive
Vice Presidents, Senior Vice Presidents, Vice Presidents, Assistant Secretaries,
Assistant Treasurers and Assistant Controllers and such other officers as deemed
necessary or appropriate.  Such officers shall be elected  annually by the Board
of Directors at its first meeting  following the annual meeting of  stockholders
(or at such other meeting as the Board of Directors determines),  and each shall
hold  office for the term  provided  by the vote of the Board,  except that each
will be  subject  to  removal  from  office  in the  discretion  of the Board as
provided herein.  The powers and duties of more than one office may be exercised
and performed by the same person.

         SECTION 2.  Vacancies.  Any vacancy in any office may be filled for the
unexpired  portion  of the term by the  Board of  Directors  at any  regular  or
special meeting.

         SECTION  3.  Chairman  of the  Board.  The  Chairman  of the  Board  of
Directors, if any, shall be the chief executive officer of the Corporation, and,
subject to the direction of the Board of Directors, shall have general charge of
the  management  and  direction  of the  business,  affairs and  property of the
Corporation,  and general  supervision over its other officers and agents,  and,
when present, shall preside at all meetings of the stockholders and the Board of
Directors.  The  Chairman of the Board of  Directors  shall  perform  such other
duties and have such other powers as the Board of Directors shall designate from
time to time.

         SECTION  4.  President.  The  President  shall be the  chief  operating
officer of the Corporation.  In general, he shall perform all duties incident to
the  office of  President  and chief  operating  officer  and shall see that all
orders and  resolutions  of the Board of  Directors  are carried into effect and
shall perform such other  executive,  supervisory  and management  functions and
duties as may be assigned to him from time to time by the Board of  Directors or
the Chairman of the Board.

         SECTION 5. Executive Vice  Presidents,  Senior Vice Presidents and Vice
Presidents.  Each  Executive  Vice  President,  Senior Vice  President  and Vice
President  shall have and exercise  such powers and shall perform such duties as
from time to time may be assigned to him or to her by the Board of  Directors or
the President.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 11


         SECTION 6.  Secretary.  The  Secretary  shall  keep the  minutes of all
meetings of the stockholders and of the Board of Directors in books provided for
the purpose;  shall see that all notices are duly given in  accordance  with the
provisions of law and these  By-Laws;  the  Secretary  shall be custodian of the
records and of the corporate  seal or seals of the  Corporation;  shall see that
the corporate seal is affixed to all documents the execution of which, on behalf
of the Corporation under its seal, is duly authorized,  and, when the seal is so
affixed,  he or she may attest the same;  and, in general,  the Secretary  shall
perform all duties  incident to the office of  secretary of a  corporation,  and
such  other  duties  as from time to time may be  assigned  to him or her by the
Board of Directors.

         SECTION 7. Assistant Secretaries. The Assistant Secretaries in order of
their seniority  shall,  in the absence or disability of the Secretary,  perform
the duties and exercise the powers of the Secretary and shall perform such other
duties as the Board of Directors  shall prescribe or as from time to time may be
assigned by the Secretary.

         SECTION  8.  Treasurer.  The  Treasurer  shall  have  charge  of and be
responsible  for  all  funds,  securities,  receipts  and  disbursements  of the
Corporation,  and shall  deposit,  or cause to be deposited,  in the name of the
Corporation, all monies or other valuable effects in such banks, trust companies
or other  depositaries as shall,  from time to time, be selected by the Board of
Directors; may endorse for collection on behalf of the Corporation checks, notes
and other  obligations;  may sign receipts and vouchers for payments made to the
Corporation; may sign checks of the Corporation,  singly or jointly with another
person as the Board of Directors may  authorize,  and pay out and dispose of the
proceeds  under the direction of the Board;  the  Treasurer  shall render to the
President and to the Board of Directors,  whenever requested,  an account of the
financial  condition of the Corporation;  and in general,  shall perform all the
duties  incident to the office of  treasurer  of a  corporation,  and such other
duties as from time to time may be assigned by the Board of Directors.

         SECTION 9. Assistant  Treasurers.  The Assistant Treasurers in order of
their seniority  shall,  in the absence or disability of the Treasurer,  perform
the duties and exercise the powers of the Treasurer and shall perform such other
duties as the Board of Directors  shall prescribe or as from time to time may be
assigned by the Treasurer.

         SECTION 10. Controller.  The Controller, if elected, shall be the chief
accounting  officer of the  Corporation and shall perform all duties incident to
the  office  of a  controller  of a  corporation,  and,  in  the  absence  of or
disability of the Treasurer or any Assistant  Treasurer,  perform the duties and
exercise the powers of the  Treasurer and shall perform such other duties as the
Board of  Directors  shall  prescribe or as from time to time may be assigned by
the Chairman of the Board, if any, the President or the Treasurer.

         SECTION 11. Assistant  Controllers.  The Assistant Controllers in order
of their  seniority  shall,  in the  absence or  disability  of the  Controller,
perform the duties and exercise the powers of the  Controller  and shall perform
such other duties as the Board of Directors  shall  prescribe or as from time to
time may be assigned by the Controller.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 12


         SECTION 12.  Subordinate  Officers.  The Board of Directors may appoint
such subordinate officers as it may deem desirable. Each such officer shall hold
office for such period, have such authority and perform such duties as the Board
of  Directors  may  prescribe.  The Board of Directors  may,  from time to time,
authorize  any  officer  to  appoint  and  remove  subordinate  officers  and to
prescribe the powers and duties thereof.

         SECTION  13.  Compensation.  The  Board  of  Directors  shall  fix  the
compensation of all officers of the  Corporation.  It may authorize any officer,
upon whom the power of appointing  subordinate officers may have been conferred,
to fix the compensation of such subordinate officers.

         SECTION 14.  Removal.  Any officer of the  Corporation  may be removed,
with or without cause, by action of the Board of Directors.

         SECTION 15.  Bonds.  The Board of Directors  may require any officer of
the Corporation to give a bond to the Corporation, conditional upon the faithful
performance  of his or her duties,  with one or more sureties and in such amount
as may be satisfactory to the Board of Directors.

                        ARTICLE VI CERTIFICATES OF STOCK


         SECTION 1. Form and  Execution  of  Certificates.  The interest of each
stockholder  of  the  Corporation   shall  be  evidenced  by  a  certificate  or
certificates for shares of stock in such form as the Board of Directors may from
time to time  prescribe.  The  certificates  of  stock  of each  class  shall be
consecutively numbered and signed by the Chairman or Vice Chairman of the Board,
if any, the President,  an Executive Vice President,  Senior Vice President or a
Vice President and by the Secretary, an Assistant Secretary, the Treasurer or an
Assistant Treasurer of the Corporation,  and may be countersigned and registered
in such manner as the Board of Directors may by resolution prescribe,  and shall
bear the corporate seal or a printed or engraved  facsimile  thereof.  Where any
such  certificate  is signed by a transfer  agent or  transfer  clerk  acting on
behalf of the Corporation,  the signatures of any such Chairman,  Vice Chairman,
President,  Executive Vice  President,  Senior Vice  President,  Vice President,
Treasurer,   Assistant  Treasurer,  Secretary  or  Assistant  Secretary  may  be
facsimiles, engraved or printed. In case any officer or officers, who shall have
signed, or whose facsimile  signature or signatures shall have been used on, any
such  certificate or  certificates,  shall cease to be such officer or officers,
whether because of death,  resignation or otherwise,  before such certificate or
certificates  shall have been delivered by the Corporation,  such certificate or
certificates  may  nevertheless  be issued and delivered by the  Corporation  as
though the person or persons  who signed such  certificate  or  certificates  or
whose  facsimile  signature or  signatures  shall have been used thereon had not
ceased to be such officer or officers.

         In case the corporate seal which has been affixed to,  impressed on, or
reproduced in any such certificate or certificates shall cease to be the seal of
the Corporation before such certificate


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 13

or  certificates  have been delivered by the  Corporation,  such  certificate or
certificates  may  nevertheless  be issued and delivered by the  Corporation  as
though the seal affixed thereto, impressed thereon or reproduced therein had not
ceased to be the seal of the Corporation.

         Every  certificate  for  shares  of  stock  which  are  subject  to any
restriction on transfer pursuant to law, the Certificate of Incorporation, these
By-Laws,  or any agreement to which the  Corporation is a party,  shall have the
restriction noted conspicuously on the certificate, and shall also set forth, on
the face or back,  either the full text of the restriction or a statement of the
existence of such restriction and (except if such restriction is imposed by law)
a statement  that the  Corporation  will furnish a copy thereof to the holder of
such certificate upon written request and without charge.

         Every  certificate  issued when the  Corporation is authorized to issue
more  than one  class or  series  of stock  shall  set forth on its face or back
either the full text of the  preferences,  voting  powers,  qualifications,  and
special and relative rights of the shares of each class and series authorized to
be  issued,  or a  statement  of the  existence  of  such  preferences,  powers,
qualifications  and rights,  and a statement that the Corporation will furnish a
copy thereof to the holder of such  certificate upon written request and without
charge.

         SECTION  2.  Transfer  of  Shares.  The  shares  of  the  stock  of the
Corporation  shall be transferred on the books of the  Corporation by the holder
thereof in person or by his or her attorney lawfully constituted, upon surrender
for  cancellation  of  certificates  for the  same  number  of  shares,  with an
assignment  and power of transfer  endorsed  thereon or attached  thereto,  duly
executed,  with such proof or guaranty of the  authenticity  of the signature as
the Corporation or its agents may reasonably  require.  The Corporation shall be
entitled  to treat  the  holder of record of any share or shares of stock as the
holder in fact  thereof  and  accordingly  shall not be bound to  recognize  any
equitable  or other  claim to or interest in such share or shares on the part of
any other person  whether or not it shall have express or other notice  thereof,
save as expressly  provided by law, by the Certificate of Incorporation or these
By-Laws.  It shall be the duty of each  stockholder to notify the Corporation of
his or her post office address.

         SECTION 3. Closing of Transfer  Books.  The stock transfer books of the
Corporation may, if deemed appropriate by the Board of Directors,  be closed for
such length of time not exceeding fifty (50) days as the Board of Directors (but
not the  stockholders)  may  determine,  preceding  the date of any  meeting  of
stockholders  or the date for the  payment of any  dividend  or the date for the
allotment  of  rights  or the date  when any  issuance,  change,  conversion  or
exchange of capital stock shall go into effect, during which time no transfer of
stock on the books of the Corporation may be made.

         SECTION 4. Fixing Date for  Determination of Stockholders of Record. In
order that the Corporation may determine the stockholders  entitled to notice of
or to vote  at any  meeting  of  stockholders  or any  adjournment  thereof,  or
entitled to receive  payment of any dividend or other  distribution or allotment
of any rights,  or  entitled  to  exercise  any rights in respect of any change,
conversion  or exchange of stock or for the purpose of any other lawful  action,
the Board of Directors (but not the  stockholders)  may fix a record date, which
record date shall not


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 14

precede the date upon which the resolution  fixing the record date is adopted by
the Board of Directors and which record date:  (a) in the case of  determination
of  stockholders  entitled to vote at any meeting of stockholders or adjournment
thereof,   shall,   unless  otherwise   required  by  law,  the  Certificate  of
Incorporation  or these  By-Laws,  not be more than sixty (60) nor less than ten
(10)  days  before  the date of such  meeting;  and (b) in the case of any other
action, shall not be more than sixty (60) days prior to such other action. If no
record date is fixed: (a) the record date for determining  stockholders entitled
to notice of or to vote at a meeting  of  stockholders  shall be at the close of
business  on the day next  preceding  the day on which  notice is given,  or, if
notice is waived,  at the close of business on the day next preceding the day on
which the meeting is held; and (b) the record date for determining  stockholders
for any other  purpose shall be at the close of business on the day on which the
Board of Directors adopts the resolution  relating  thereto.  A determination of
stockholders  of  record  entitled  to  notice  of or to  vote at a  meeting  of
stockholders shall apply to any adjournment of the meeting;  provided,  however,
that the Board of Directors (but not the stockholders) may fix a new record date
for the adjourned meeting.

         SECTION  5.  Lost or  Destroyed  Certificates.  In case of the  loss or
destruction of any  certificate of stock, a new  certificate may be issued under
the following conditions:

         a.       The owner of said certificate shall file with the Secretary or
                  any Assistant Secretary of the Corporation an affidavit giving
                  the facts in relation to the ownership, and in relation to the
                  loss or  destruction of said  certificate,  stating its number
                  and the number of shares represented  thereby;  such affidavit
                  shall be in such form and  contain  such  statements  as shall
                  satisfy the  Chairman or Vice  Chairman of the Board,  if any,
                  the President,  any Executive Vice President,  any Senior Vice
                  President,  any Vice President,  the Secretary,  any Assistant
                  Secretary, the Treasurer or any Assistant Treasurer, that said
                  certificate has been accidentally  destroyed or lost, and that
                  a new  certificate  ought to be issued in lieu  thereof.  Upon
                  being so satisfied, any such officer may require such owner to
                  furnish the Corporation a bond in such sum and in such form as
                  he or she may deem  advisable,  and with a surety or  sureties
                  approved by him or her, to  indemnify  and save  harmless  the
                  Corporation  from any claim,  loss,  damage or liability which
                  may be occasioned by the issuance of a new certificate in lieu
                  thereof.  Upon such bond being so filed, if so required, a new
                  certificate  for the same number of shares  shall be issued to
                  the owner of the  certificate  so lost or  destroyed;  and the
                  transfer  agent  and   registrar,   if  any,  of  stock  shall
                  countersign and register such new certificate  upon receipt of
                  a written order signed by any such officer,  and thereupon the
                  Corporation   may  save  harmless  said  transfer   agent  and
                  registrar  in the  premises.  In case of the  surrender of the
                  original  certificate,  in lieu of which a new certificate has
                  been issued,  or the  surrender of such new  certificate,  for
                  cancellation,  the bond of  indemnity  given as a condition of
                  the issue of such new certificate may be surrendered; or

         b.       The Board of Directors of the  Corporation  may by  resolution
                  authorize and direct any transfer  agent or registrar of stock
                  of the Corporation to issue and register


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 15

                  respectively  from  time to time  without  further  action  or
                  approval by or on behalf of the Corporation  new  certificates
                  of stock to  replace  certificates  reported  lost,  stolen or
                  destroyed  upon  receipt of an  affidavit  of loss and bond of
                  indemnity in form and amount and with surety  satisfactory  to
                  such transfer agent or registrar in each instance or upon such
                  terms and conditions as the Board of Directors may determine.

         SECTION  6.  Uncertificated  Shares.  The  Board  of  Directors  of the
Corporation may by resolution  provide that one or more of any or all classes or
series of the stock of the Corporation shall be uncertificated  shares,  subject
to the provisions of Section 158 of the Delaware General Corporation Law.

         SECTION 7. Transfer Agents and  Registrars;  Further  Regulations.  The
Board  of  Directors  may  appoint  one  or  more  banks,   trust  companies  or
corporations  doing a corporate trust business,  in good standing under the laws
of the United States or any state therein, to act as the Corporation's  transfer
agent and/or registrar for shares of one or more classes or series of its stock,
and the Board may make such other and further regulations, not inconsistent with
applicable  law, as it may deem  expedient  concerning  the issue,  transfer and
registration of the Corporation's stock and stock certificates.

                       ARTICLE VII EXECUTION OF DOCUMENTS


         SECTION 1.  Execution of Checks,  Notes,  etc. All checks and drafts on
the Corporation's  bank accounts and all bills of exchange and promissory notes,
and all acceptances, obligations and other instruments for the payment of money,
shall be signed by such  officer or  officers,  or agent or agents,  as shall be
thereunto  authorized from time to time by the Board of Directors,  which may in
its discretion authorize any such signatures to be facsimile.

         SECTION 2. Execution of Contracts,  Assignments,  etc. Unless the Board
of Directors shall have otherwise  provided generally or in a specific instance,
all contracts, agreements,  endorsements,  assignments, transfers, stock powers,
or other  instruments  shall be signed by the  Chairman or Vice  Chairman of the
Board,  if any, the  President,  any Executive Vice  President,  any Senior Vice
President,  any Vice  President,  the Secretary,  any Assistant  Secretary,  the
Treasurer or any Assistant  Treasurer.  The Board of Directors may, however,  in
its discretion,  require any or all such  instruments to be signed by any two or
more of such officers, or may permit any or all of such instruments to be signed
by such  other  officer or  officers,  agent or  agents,  as it shall  thereunto
authorize from time to time.

         SECTION 3.  Execution of Proxies.  The Chairman or Vice Chairman of the
Board,  if any, the  President,  any Executive Vice  President,  any Senior Vice
President or any Vice President, and the Secretary, the Treasurer, any Assistant
Secretary or any Assistant  Treasurer,  or any other  officer  designated by the
Board of Directors,  may sign on behalf of the Corporation  proxies to vote upon
shares of stock of other companies standing in the name of the Corporation.



<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 16

                        ARTICLE VIII INSPECTION OF BOOKS


         The Board of Directors shall  determine from time to time whether,  and
if allowed, to what extent and at what time and places and under what conditions
and regulations,  the accounts and books of the Corporation  (except such as may
by law be specifically  open to inspection) or any of them, shall be open to the
inspection  of the  stockholders,  and no  stockholder  shall  have any right to
inspect any account or book or document of the Corporation,  except as conferred
by the laws of the State of Delaware,  unless and until  authorized  so to do by
resolution of the Board of Directors or of the stockholders of the Corporation.

                             ARTICLE IX FISCAL YEAR


         The fiscal year of the  Corporation  shall be  determined  from time to
time by vote of the Board of Directors.

                                 ARTICLE X SEAL


         The seal of the Corporation  shall,  subject to alteration by the Board
of  Directors,  consist of a flat-faced  circular die with the word  "Delaware",
together with the name of the Corporation and the year of incorporation,  cut or
engraved thereon.

                              ARTICLE XI AMENDMENTS


         These  By-Laws may be  altered,  amended,  changed or repealed  and new
By-Laws  adopted by the  stockholders or by the Board of Directors in accordance
with the provisions set forth in the  Certificate  of  Incorporation,  in either
case at any meeting  called for that purpose at which a quorum shall be present.
Any  By-Law,  whether  made,  altered,  amended,  changed  or  repealed  by  the
stockholders  or the  Board of  Directors  may be  repealed,  amended,  changed,
further amended,  changed, repealed or reinstated, as the case may be, either by
the stockholders or by the Board of Directors as above provided.

                     ARTICLE XII RESTRICTIONS ON TRANSFER OF
               CERTAIN SHARES OF CAPITAL STOCK OF THE CORPORATION3


         SECTION 1. Restrictions on Transfer. Any Person who receives any shares
of Common Stock of the Corporation (the "Merger  Securities") issued pursuant to
the  Agreement  and Plan of Merger,  dated as of February 19, 1997, by and among
the Corporation, IM-1 Acquisition
- --------
3 Adopted June 12, 1997.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 17

Corp.  and  Safesite  Records  Management  Corporation,  as amended (the "Merger
Agreement"),  shall not Transfer (as defined herein),  and the Corporation shall
not be required  to  register  the  Transfer  of, the number of shares,  rounded
upward  to the  nearest  whole  share  (the  "Subject  Shares"),  of the  Merger
Securities equal to the product of (1) the quotient obtained by dividing (x) the
"Lock-up  Value" by (y) the product of (A) the Common  Stock  Amount and (B) the
lesser of the Closing Price and the  Determination  Price  multiplied by (2) the
Stock  Merger  Consideration  received  by such  Person in  connection  with the
Merger,  until the first  anniversary  date of the effective  date of the Merger
Agreement (the "Effective  Time"),  except as otherwise  allowed by the Board of
Directors of the Corporation in its sole  discretion.  The "Lock-up Value" shall
mean one half (1/2) of the sum of (x) the product of the Common Stock Amount and
the lesser of the Closing  Price and the  Determination  Price plus (y) the Cash
Amount.  The "Closing  Price" shall mean the closing price per share of Acquiror
Stock for the trading day  immediately  prior to the Effective Time. The closing
price for such  trading  day shall be the last  quoted  sale price or, if not so
quoted,  the average of the low bid and high asked prices on the Nasdaq National
Market  System.  Capitalized  terms used herein and not otherwise  defined shall
have  the  meanings  prescribed  therefor  in the  Merger  Agreement.  The  term
"Transfer"  means  any  indirect  or  direct  transfer,  offer  to  sell,  sale,
assignment, grant of an option to acquire, pledge, or other disposition.

         SECTION 2. Legend on Stock Certificates.  The Corporation shall note on
the  certificates  for the  Subject  Shares of  Merger  Securities  issued  upon
transfer that the shares  represented  by such  certificates  are subject to the
restrictions on transfer and  registration  of transfer  imposed in this Article
XII.

         SECTION 3. Termination of Restrictions on Transfers.  The provisions of
this Article XII shall  terminate in their entirety on the first  anniversary of
the Effective Time.


                ARTICLE XIII RESTRICTIONS ON TRANSFER OF CERTAIN
                   SHARES OF CAPITAL STOCK OF THE CORPORATION4


         SECTION 1. Restrictions on Transfer. Except as otherwise allowed by the
Board of Directors of the Corporation in its sole discretion,  until the earlier
of (i) the first  anniversary of the effective date (the "Effective Time") under
the Agreement  and Plan of Merger,  dated as of September 26, 1997, by and among
the Corporation,  Arcus Group, Inc. ("AGI"),  United Acquisition Company ("UAC")
and Arcus Technology  Services,  Inc. ("ATSI, and together with AGI and UAC, the
"Arcus Parties") (as amended, the "Merger Agreement"), or (ii) the date on which
a Transfer (as such term is  hereinafter  defined in this  Article  XIII) may be
effected  in a  manner  that  the  Corporation  reasonably  determines  does not
adversely  affect the tax-free  nature of the Merger (as such term is defined in
the Merger Agreement) under Section 368(a) of the Internal Revenue Code of 1986,
as amended, any Person who receives any shares of
- --------
4 Adopted January 6, 1998.


<PAGE>


By-Laws of Iron Mountain Incorporated
A Delaware Corporation
Page 18

Common Stock of the  Corporation  issued  pursuant to the Merger  Agreement (the
"Merger  Securities")  shall  not  Transfer,  and the  Corporation  shall not be
required  to  register  the  Transfer  of,  such  Merger  Securities.  The  term
"Transfer"  means  any  indirect  or  direct  transfer,  offer  to  sell,  sale,
assignment,  grant of an  option  to  acquire,  pledge,  or  other  disposition;
provided,  however,  that a Transfer  by a  partnership  or a limited  liability
company to its partners or members, which Transfer is to all partners or members
in  proportion  to their  interests  in such  partnership  or limited  liability
company,  shall be permissible  except that the Merger Securities so Transferred
shall continue to be subject to the  restrictions  on transfer set forth in this
Article  XIII;  provided  further that the  provisions of this section shall not
apply to Merger  Securities to the extent such Merger  Securities were issued in
exchange  for  shares of common  stock of AGI of any Person  who  received  such
shares  pursuant to the exercise of an option as a result of the  application of
Section 5.10 of the Merger Agreement.

         SECTION 2. Legend on Stock Certificates.  The Corporation shall note on
the  certificates for the Merger  Securities  issued upon the Merger or upon any
Transfer thereof that the shares represented by such certificates are subject to
the  restrictions  on transfer  and  registration  of  transfer  imposed in this
Article XIII.




                                                                       EXHIBIT 5

                            SULLIVAN & WORCESTER LLP
                             ONE POST OFFICE SQUARE
                           BOSTON, MASSACHUSETTS 02109
                                 (617) 338-2800
                              FAX NO. 617-338-2880
      IN WASHINGTON, D.C.                                  IN NEW YORK CITY
1025 CONNECTICUT AVENUE, N.W.                              767 THIRD AVENUE
   WASHINGTON, D.C. 20036                              NEW YORK, NEW YORK 10017
       (202) 775-8190                                       (212) 486-8200
   FAX NO. 202-293-2275                                  FAX NO. 212-758-2151




                                January 13, 1998



Iron Mountain Incorporated
745 Atlantic Avenue
Boston, MA 02111

         Re:      Registration Statement on Form S-4;
                  1,000,000 shares of Iron Mountain
                  Incorporated Common Stock, par value $.01 per share

Ladies and Gentlemen:

         In connection with the  registration  under the Securities Act of 1933,
as amended (the  "Securities  Act"), by Iron Mountain  Incorporated,  a Delaware
corporation  (the "Company"),  of 1,000,000 shares (the "Registered  Shares") of
its  Common  Stock,  par value  $.01 per share  ("Common  Stock"),  all of which
Registered  Shares are to be offered by the Company,  the  following  opinion is
furnished to you to be filed with the  Securities and Exchange  Commission  (the
"Commission") as Exhibit 5 to the Company's  registration  statement on Form S-4
(the  "Registration  Statement") under the Securities Act. The Registered Shares
are to be offered on a delayed or continuous  basis in connection  with business
combination transactions pursuant to Rule 415 under the Securities Act.

         We assume that the number,  issuance and sale of the Registered  Shares
to be offered  from time to time will be  determined  and  authorized  by proper
action  of the  Board  of  Directors  of the  Company  in  accordance  with  the
parameters  described in the Registration  Statement (each a "Board Action") and
in  accordance   with  the  Company's   Amended  and  Restated   Certificate  of
Incorporation  and applicable  Delaware law. We further assume that prior to the
issuance of any Registered Shares, there will exist, under the Company's Amended
and Restated  Certificate of  Incorporation,  the requisite number of authorized
shares  of  Common  Stock  for such  issuance  which  are  unissued  and are not
otherwise reserved for issuance.

         We have  acted  as  counsel  to the  Company  in  connection  with  the
Registration Statement,  and we have examined originals or copies,  certified or
otherwise  identified to our satisfaction,  of the Registration  Statement,  the
Amended and Restated Certificate of 


<PAGE>
Iron Mountain Incorporated
January 13, 1998
Page 2

Incorporation  of  the  Company  as  presently  in  effect,  corporate  records,
certificates  andstatements  of officers and  accountants  of the Company and of
public  officials,  and such other documents as we have considered  necessary in
order to furnish the opinion hereinafter set forth.

         This   opinion  is  limited  to  the  laws  of  The   Commonwealth   of
Massachusetts,  the Delaware General Corporation Law and the federal laws of the
United  States of America,  and we express no opinion with respect to the law of
any other jurisdiction.

         Based on and subject to the foregoing, we are of the opinion that, when
the  Registration  Statement has become effective under the Securities Act, upon
due authorization by Board Action of an issuance of Registered  Shares, and upon
delivery of  certificates  representing  the Registered  Shares against  payment
therefor in the manner  contemplated by such Board Action and in accordance with
the  terms  of  such  agreements  (if  any)  relating  to one or  more  business
combination  transactions  as the Company may enter into from time to time,  the
Registration Statement and any applicable Prospectus Supplement,  the Registered
Shares represented by such certificates will be duly authorized, validly issued,
fully paid and nonassessable by the Company.

         We hereby  consent to the  filing of this  opinion as an exhibit to the
Registration  Statement  and to the  reference  to our  firm  in the  Prospectus
forming a part of the Registration  Statement. In giving such consent, we do not
thereby  admit that we come  within the  category  of persons  whose  consent is
required under Section 7 of the  Securities Act or the rules and  regulations of
the Commission promulgated thereunder.

                                           Very truly yours,

                                           /s/ Sullivan & Worcester LLP

                                           SULLIVAN & WORCESTER LLP



                                                                   EXHIBIT 10.13

                              STOCKHOLDER AGREEMENT


                  AGREEMENT, dated as of September 17, 1997, among Iron Mountain
Incorporated,  a  Delaware  corporation  ("Acquiror"),  and Kent P.  Dauten,  an
individual  having a business address at Keystone  Capital,  Inc., 520 Lake Cook
Road, Suite 450, Deerfield, IL 60015 (the "Principal Stockholder").

                              W I T N E S S E T H:

                  WHEREAS,  the  Principal  Stockholder  is the  beneficial  and
record  owner of 8,050  shares of the Class A Common  Stock,  $.01 par value per
share (the "Class A Company  Stock") of HIMSCORP,  Inc., a Delaware  corporation
(the "Company"),  and 8,346.2 shares of the Class B Common Stock, $.01 par value
per  share  (the  "Class B Company  Stock"  and,  collectively  with the Class A
Company Stock, the "Company Stock") of the Company;

                  WHEREAS,  concurrently  with the execution of this  Agreement,
Acquiror and the Company are entering  into an Agreement and Plan of Merger (the
"Merger Agreement") pursuant to which the Company will be merged with and into a
wholly owned  subsidiary of Acquiror  (the  "Merger"),  with such  subsidiary of
Acquiror continuing as the Surviving Corporation; and

                  WHEREAS,  in order to induce Acquiror to enter into the Merger
Agreement,  the Principal  Stockholder  wishes to make certain  representations,
warranties, covenants and agreements in connection with the Merger.

                  NOW,  THEREFORE,  in  consideration  of the premises and other
good and  valuable  consideration,  the receipt and adequacy of which are hereby
acknowledged, the parties hereto hereby agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

                  1.1  Definitions.   Capitalized  terms  used  herein  but  not
otherwise defined herein shall have the respective  meanings ascribed thereto in
the Merger Agreement and the following terms shall have the following meanings:

                  "beneficially  own" shall have the  meaning  set forth in Rule
13d-3 under the Exchange Act.

                  "Equity  Securities"  shall have the meaning set forth in Rule
405 under the Securities Act.

                  "Intention"  shall  have the  meaning  set  forth  in  Section
2.1(f).

                                                        

<PAGE>



                  "Merger  Agreement"  shall have the  meaning  set forth in the
second recital of this Agreement.

                  "Principal  Stockholder"  shall have the  meaning set forth in
the opening paragraph of this Agreement.

                  "Related  Transaction"  shall  mean a  transaction  that is in
contemplation of, or related or pursuant to, the Merger or the Merger Agreement.

                  "Restricted   Stockholder"   shall  mean  any   Person   that,
individually or together with its Affiliates,  beneficially owns, or is a member
of a "group"  (within the meaning of Section  13(d)(3) of the Exchange Act) that
beneficially owns, 5% or more of Acquiror Stock.

                  "Sale" shall have the meaning set forth in Section 2.1(f).

                  "Principal  Stockholder  Disclosure  Letter"  shall  have  the
meaning set forth in Section 2.1(a).

                  "Third Party" shall mean a party or parties  unaffiliated with
either the Company or Acquiror.

                  "Transfer" shall have the meaning set forth in Section 3.8.

                  "Voting  Securities"  shall have the meaning set forth in Rule
405 under the Securities Act.

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

                  2.1   Representations   and   Warranties   of  the   Principal
Stockholder.  The Principal  Stockholder  represents and warrants to Acquiror as
follows:

                  (a)  Ownership  of  Company  Shares.  Except as  disclosed  in
Section 2.1(a) of the letter from the Principal  Stockholder to Acquiror,  dated
the date hereof (the "Principal  Stockholder  Disclosure Letter"), the Principal
Stockholder is the beneficial owner of 8,050 shares of Class A Company Stock and
8,346.2 shares of Class B Company Stock, free and clear of all Liens (other than
restrictions under securities laws generally) and, except for this Agreement and
the  Merger  Agreement,   there  are  no  options,  warrants  or  other  rights,
agreements,  arrangements or commitments of any character to which the Principal
Stockholder  is a party  relating  to the pledge,  disposition  or voting of any
shares of the Company  Stock that are owned by the  Principal  Stockholder,  and
there are no voting  trusts or voting  agreements  with  respect to such shares.
Such 8,050 shares of Class A Company Stock and 8,346.2 shares of Class B Company
Stock  constitute all of the outstanding  shares of capital stock of the Company
owned  beneficially or of record by the Principal  Stockholder and the Principal
Stockholder does not have any options,

                                       -2-

<PAGE>



warrants or other rights to acquire any  additional  shares of capital  stock of
the Company or any security  exercisable  or  exchangeable  for, or  convertible
into, shares of capital stock of the Company.

                  (b) Authority to Execute and Perform Agreements. The Principal
Stockholder  has the full legal  right and power and all  authority  required to
enter  into,  execute  and  deliver  this  Agreement  and to  perform  fully his
obligations  hereunder.  This Agreement has been duly executed and delivered and
constitutes the legal, valid and binding obligation of the Principal Stockholder
enforceable  against the  Principal  Stockholder  in  accordance  with its terms
(subject to the Enforceability Exceptions).

                  (c) No  Conflicts;  Consents.  Except as set forth in  Section
2.1(c)(i) of the  Principal  Stockholder  Disclosure  Letter,  the execution and
delivery  by the  Principal  Stockholder  of  this  Agreement  do  not,  and the
consummation of the transactions  contemplated hereby will not, conflict with or
result in any violation of or default (with or without  notice or lapse of time,
or both) under (A) any contract, agreement or other binding arrangement to which
the  Principal  Stockholder  is a  party  or  (B)  any  judgment,  order,  writ,
injunction or decree of any court,  governmental body,  administrative agency or
arbitrator  applicable  to the  Principal  Stockholder.  Except  as set forth in
Section   2.1(c)(ii)  of  the  Principal   Stockholder   Disclosure  Letter,  no
Governmental  Authorizations  or  Private  Authorizations  are  required  to  be
obtained or made by the Principal  Stockholder in connection  with the execution
and delivery by the Principal Stockholder of this Agreement and the consummation
of the transactions contemplated hereby.

                  (d) Information Supplied. None of the information specifically
supplied or to be  supplied by the  Principal  Stockholder  with  respect to the
Principal  Stockholder for inclusion or  incorporation by reference in the proxy
statement or other written  information to be delivered to all  stockholders  of
the Company (the "Proxy  Statement")  will,  at the date the Proxy  Statement is
first  mailed  to the  Company's  stockholders  and at the  time of the  special
meeting of the  Company's  stockholders  for the purpose of voting on the Merger
Agreement  or at the time such  stockholders  execute  written  consents for the
purpose of approving  the Merger  Agreement,  contain any untrue  statement of a
material fact or omit to state any material  fact required to be stated  therein
or  necessary  in  order  to  make  the  statements  therein,  in  light  of the
circumstances under which they are made, not misleading.

                  (e)  Investigation.  The Principal  Stockholder has had a full
opportunity to review and discuss this Agreement,  the Escrow  Agreement and the
Merger  Agreement   (including,   without   limitation,   with  respect  to  the
representations   and  warranties  in  the  Merger  Agreement  and  the  related
Disclosure  Schedule)  and to ask all  questions of Acquiror and the Company and
their  respective  directors and executive  officers  necessary in order for the
Principal Stockholder to make an informed decision to enter into this Agreement.
In this regard, the Principal Stockholder  acknowledges that, in connection with
the negotiations with respect to the Merger Agreement, Acquiror has disclosed to
the Principal Stockholder certain confidential information concerning Acquiror's
operations  and  business  plans  (including,   without  limitation,   potential


                                       -3-

<PAGE>



acquisitions)   and  has  advised  the  Principal   Stockholder   that  Acquiror
anticipates  making further and more detailed  public  announcements  of certain
business plans in the near future,  none of which in Acquiror's opinion involves
a  Material  Adverse  Change in  Acquiror's  business  operations.  Accordingly,
Acquiror  has  indicated  its   willingness,   and  has  offered  the  Principal
Stockholder the option, to defer seeking approval of the Merger Agreement by the
Stockholders  of the Company  and,  accordingly,  the  Closing  under the Merger
Agreement  until  such  time as those  announcement  are  made,  which  Acquiror
anticipates  would  occur not later  than the end of  September.  The  Principal
Stockholder  acknowledges that he nevertheless is prepared to seek such approval
and proceed with the Closing under the Merger  Agreement at an earlier date. The
Principal  Stockholder further acknowledges that he is a sophisticated  investor
and has consented to the scope of the  disclosure  previously  made to him about
Acquiror's business plans and that, subject to his rights in respect of a breach
of  Acquiror's  representations  and  warranties  in  Section  2.2  hereof,  the
Principal Stockholder agrees to waive any claim or right he might otherwise have
arising out of the information  concerning Acquiror's business plans referred to
above made public on or after the date hereof and on or prior to  September  30,
1997.

                  (f) Intent to Transfer Shares. The Principal  Stockholder has,
and as of the  Closing  Date,  will  have,  no  present  plan or  intention  (an
"Intention") to sell, transfer,  exchange,  pledge (other than in a pre-existing
bona fide margin account) or otherwise dispose of, including a distribution by a
partnership to its partners, or a corporation to its shareholders,  or any other
transaction  which results in a reduction of ownership (any of the foregoing,  a
"Sale")  of more than  162/3%  of the  shares of  Acquiror  Stock  issued to the
Principal  Stockholder in the Merger,  or any  securities  that may be paid as a
dividend  otherwise  distributed  thereon or with respect thereto,  or issued or
delivered in exchange or substitution  therefor or upon exercise of options held
by the Principal Stockholder.  For purposes of the preceding sentence, shares of
Company  Stock (or the portion  thereof) with respect to which a Sale will occur
prior to the Merger shall be  considered  to be shares of Company Stock that are
exchanged  for Acquiror  Stock in the Merger and then disposed of pursuant to an
Intention.  A Sale of  Acquiror  Stock  shall  be  considered  to have  occurred
pursuant to an Intention if, among other  things,  such Sale occurs in a related
transaction.  Subject  to the  terms of the  Investment  Agreement  between  the
Principal  Stockholder and Acquiror,  the Principal Stockholder (i) reserves the
rights at any time after the Closing Date to evaluate his investment  portfolio,
including shares of Acquiror Stock and any other securities  issued by Acquiror,
in light of new,  material  developments,  and to make such investment  decision
with respect to such securities as the Principal  Stockholder and his investment
advisors, if any, shall deem to be in his best interests,  and (ii) specifically
disavows  any  undertaking  to hold any  securities  issued by Acquiror  for any
specific period.

                  2.2  Representations  and  Warranties  of  Acquiror.  Acquiror
hereby   represents  and  warrants  to  the  Principal   Stockholder   that  the
confidential  information  disclosed to the Principal Stockholder referred to in
Section  2.1(e)  hereof (i) is, to  Acquiror's  knowledge,  true in all material
respects  and (ii)  has not been  disclosed  in a manner  that is  intentionally
misleading to the Principal Stockholder.



                                       -4-

<PAGE>



                                   ARTICLE III

                                    COVENANTS

                  3.1 No Disposition  or  Acquisition  of Shares.  The Principal
Stockholder  agrees  that he shall  not  sell,  transfer,  pledge,  hypothecate,
encumber or  otherwise  dispose of (except in the Merger  pursuant to the Merger
Agreement  or upon  the  Principal  Stockholder's  death),  or  enter  into  any
contract, option or other arrangement or understanding with respect to the sale,
transfer, pledge, hypothecation,  encumbrance or other disposition of (except in
the Merger pursuant to the Merger Agreement), any of the shares of Company Stock
owned of record or beneficially by him.

                  3.2 Voting  Arrangements.  The  Principal  Stockholder  agrees
that, except pursuant to this Agreement, he shall not grant any proxies, deposit
any  shares  of  Company  Stock  into a voting  trust or enter  into any  voting
agreement  with respect to any shares of Company  Stock now or hereafter  owned,
beneficially or of record, by him, other than proxies to vote such shares at any
annual or special meeting of stockholders of the Company on matters unrelated to
the matters set forth in Section 4.1 hereof.

                  3.3  Satisfaction  of Conditions to the Merger.  The Principal
Stockholder  agrees that he, in his capacity as a Stockholder,  shall assist and
cooperate  with  the  parties  to the  Merger  Agreement  in  doing  all  things
necessary,  proper or advisable under Applicable Laws as promptly as practicable
to consummate and make effective the Merger and the other  Transactions,  and he
shall not take any action that would or is reasonably likely to result in any of
his  representations  and warranties set forth in this Agreement being untrue as
of the date  made or in any of the  conditions  set  forth in  Article  6 of the
Merger Agreement not being satisfied.

         In addition,  Acquiror and the  Principal  Stockholder  agree that they
will execute and deliver the Joinder to Registration Rights Agreement.

                  3.4 No Other  Transactions.  The Principal  Stockholder agrees
that he shall not,  nor shall he permit any of his  Representatives  (including,
without  limitation,  any investment banker,  attorney or accountant retained by
him) to, initiate, solicit or facilitate,  directly or indirectly, any inquiries
or the making of any proposal  with respect to an Other  Transaction,  engage in
any discussions or negotiations  concerning,  or provide to any other person any
information or data relating to, the Company or any of its  Subsidiaries for the
purposes of, or otherwise cooperate in any way with or assist or participate in,
or facilitate any inquiries or the making of any proposal which constitutes,  or
may  reasonably  be  expected  to lead to, a proposal to seek or effect an Other
Transaction,  or agree to or endorse any Other Transaction;  provided,  however,
that nothing contained in this Section shall prohibit the Principal Stockholder,
if he is a  member  of  Board of  Directors  of the  Company,  from  making  any
disclosure,  in his capacity as a director of the Company, to other stockholders
of the  Company  that,  in the  reasonable  judgment of the  Company's  Board of
Directors in  accordance  with,  and based upon the written  advice of,  

                                       -5-

<PAGE>



outside  counsel,  is required under  Applicable Law. The Principal  Stockholder
shall promptly advise  Acquiror of, and  communicate  the material terms of, any
proposal he may receive,  or any inquiries he receives  which may  reasonably be
expected to lead to such a proposal  relating to an Other  Transaction,  and the
identity of the Person making it. The Principal Stockholder shall further advise
Acquiror of the status and changes in the material terms of any such proposal or
inquiry (or any  amendment to any of them).  During the term of this  Agreement,
the Principal Stockholder agrees that he shall not enter into any agreement oral
or written,  and whether or not legally  binding,  with any Person that provides
for, or in any way facilitates, an Other Transaction.

                  3.5  Standstill.  The Principal  Stockholder  agrees that, (i)
from the date hereof  until the Closing Date and (ii) from and after the Closing
Date for so long as he shall be a Restricted Stockholder up to and including the
tenth anniversary of the date of this Agreement, he shall not, and shall use his
best efforts to cause his Affiliates  not to, without the prior written  consent
of the board of  directors  of  Acquiror,  (A) in any manner  acquire,  agree to
acquire or make any  proposal to acquire,  directly  or  indirectly,  any Equity
Securities  of  Acquiror  or any  rights  or  options  to  acquire  such  Equity
Securities  (other  than the shares of  Acquiror  Stock  received  by him in the
Merger and other than options granted to directors of Acquiror),  (B) propose to
enter  into,  directly or  indirectly,  a merger or other  business  combination
involving  Acquiror or propose to purchase,  directly or indirectly,  a material
portion of the assets of Acquiror, (C) make, or in any way participate, directly
or indirectly,  in, any  "solicitation"  of "proxies" (as such terms are used in
Regulation  14A under the Exchange  Act) to vote or consent or seek to advise or
influence  any Person  with  respect to the voting of, or  granting of a consent
with respect to, any Voting Securities of Acquiror, (D) form, join or in any way
participate in a "group" (within the meaning of Section 13(d)(3) of the Exchange
Act) for the purpose of  acquiring,  holding  voting or  disposing of any Equity
Securities of Acquiror,  (E) otherwise act, alone or in concert with others,  to
seek to control or influence in any public manner or public forum the management
or policies of Acquiror;  provided,  however, that the foregoing shall not limit
the  ability  to vote any  shares of any  Equity  Securities  of  Acquiror,  (F)
disclose any intention, plan or arrangement inconsistent with the foregoing, (G)
advise, assist (including by knowingly providing or arranging financing for that
purpose) or encourage any other Person in  connection  with any of the foregoing
or (H) take any action (other than in exercising his  registration  rights under
the Registration Rights Agreement) which might require Acquiror to make a public
announcement  regarding the  possibility of a transaction  between the Principal
Stockholder and Acquiror (including any of their respective Affiliates).

                  3.6 Confidentiality, Non-Competition and Non-Solicitation.

                  (a) Except with the prior written  consent of Acquiror,  for a
period of five years from the Closing Date, the Principal  Stockholder shall not
disclose or make available,  directly or indirectly, to others or use for his or
others' benefit confidential  information,  whether or not reduced to written or
other  recorded form,  related to Acquiror or the Company and its  Subsidiaries,
including the names of customers, the contact persons at customers, pricing, the

                                       -6-

<PAGE>



software  programs  utilized by Acquiror or the Company and its  Subsidiaries in
the  operation  of its  business  and  all  other  information  material  to the
operation,  management,  marketing or financing of Acquiror, the Company and its
Subsidiaries  which  is not  known  or  generally  available  to the  public  or
competitors in the records management or records storage industries.

The confidentiality obligations of this Section shall not apply to information:

                  (i)  which  is  required  to  be   disclosed  by  judicial  or
administrative process or order, or by other requirements of law;

                  (ii) which is or  becomes  generally  available  to the public
other than as a result of a breach of this Section;

                  (iii) which is received  from a third party who obtained  such
information other than under an obligation of confidentiality; or

                  (iv) which Acquiror  discloses on a  nonconfidential  basis or
otherwise makes available to the general public or the trade.

                  (b) The Principal  Stockholder agrees that he shall not, for a
period of five years from the Closing Date,  directly or indirectly own, manage,
engage in,  participate  in, provide advice to, be employed by, have a financial
interest  in, or  solicit or attempt to obtain  business  from any  customer  of
Acquiror or the Company or any of its  Subsidiaries on behalf of, any enterprise
which  provides  records  management  or records  storage  services  to business
facilities (including,  without limitation, the management,  handling,  storage,
filing,  processing and retrieval of medical records used by hospitals,  private
practitioners, and other medical institutions) located in the United States.

         This Section 3.6(b) shall not prohibit the Principal  Stockholder  from
owning Equity Securities of Acquiror or acquiring up to five percent (5%) of any
class of securities  registered  pursuant to the Exchange Act of any corporation
which may engage in the records  management  storage service  business in direct
competition  with the  business of Acquiror  within the  geographical  areas set
forth in this Section 3.6(b).

                  (c) The Principal  Stockholder agrees that he shall not on his
own behalf or on behalf of any other  Person  under his  control or on behalf of
others, for a period of five years from the Closing Date, directly or indirectly
solicit for employment (including as an independent contractor),  or endeavor to
entice away,  any of the  officers,  employees  or  independent  contractors  of
Acquiror  or the  Company or any of their  respective  subsidiaries  who perform
services  for Acquiror or the Company or any of their  respective  subsidiaries.
For the avoidance of doubt, Acquiror acknowledges that this Section 3.6(c) shall
not prohibit the Principal  Stockholder from employing,  on his own behalf or on
behalf of any other  Person  under his control or on behalf of others,  a former
officer,  employee or  independent  contractor of Acquiror or the Company or its

                                       -7-

<PAGE>



subsidiaries  who has ceased to perform  services for Acquiror or the Company or
any of  their  respective  subsidiaries  without  enticement  by  the  Principal
Stockholder and who seeks employment (including as an independent contractor) by
the Principal Stockholder without solicitation by the Principal Stockholder.

                  (d)  The  Principal  Stockholder   acknowledges  that  he  has
carefully  read  all the  terms  herein  stated  and  agrees  that  the same are
necessary for the reasonable and proper  protection of the value of the Company;
and that each and every  covenant is  reasonable  with  respect to such  matter,
length of time, and the geographical  areas described;  and that irrespective of
all other conditions,  the covenants and restrictions hereinabove provided shall
be  operative  during  the full  period and  throughout  the  geographical  area
described.  In the event any court finds any such  restraint or limitation to be
unreasonable,  then it is the  intent  of the  parties  that such  court  should
determine  the  maximum   restraint  or  limitation   which  is  reasonable  and
enforcement will be of that restraint or limitation.

                  (e) The Principal  Stockholder  acknowledges that confidential
information in his possession  related to the Company and its  Subsidiaries  has
particular  value,  the loss of  confidentiality  of which by  communication  to
unauthorized  persons  cannot be  reasonably or  adequately  compensated  for by
damages alone.  Moreover,  the Principal  Stockholder  agrees that any breach of
paragraphs (a), (b) and (c) of this Section 3.6 would give rise to damages which
would be difficult to calculate. Therefore, the parties hereby agree that in the
event of a breach  of any of the  terms  and  conditions  of this  Section  3.6,
Acquiror  shall be entitled to equitable  relief by way of an  injunction.  This
Section 3.6 shall not be construed as a limitation upon Acquiror's  remedies for
such breach.

                  (f) The  restrictions  contained  in this Section 3.6 shall be
broadly  construed  by any court having  jurisdiction  of the matter in order to
protect Acquiror to the maximum degree possible.

                                   ARTICLE IV

                             PROXY; WAIVER OF RIGHTS

                  4.1 Proxy.  The Principal  Stockholder  hereby agrees,  at any
meeting  of the  stockholders  of the  Company,  however  called,  and at  every
adjournment thereof, and in any action by written consent of the stockholders of
the  Company,  to (a)  vote all of the  shares  of  Company  Stock  then  owned,
beneficially  or of  record,  by him in  favor  of the  adoption  of the  Merger
Agreement as in effect on the date hereof (as such  agreement may be amended (1)
as contemplated  by Section 7.3 of the Merger  Agreement or (2) with the consent
of the Principal  Stockholder) and each of the other  transactions  contemplated
thereby and any action  required in  furtherance  thereof,  (b) vote such shares
against any action or  agreement  that would  result in a breach in any material
respect of any covenant,  representation  or warranty or any other obligation of
the Company  under the Merger  Agreement,  and (c) vote such shares  against any
Other Transaction or any other action 

                                       -8-

<PAGE>



or agreement that,  directly or indirectly,  is inconsistent with or that would,
or is reasonably  likely to, directly or indirectly,  impede,  interfere with or
attempt to discourage the Merger or any other  transaction  contemplated  by the
Merger Agreement,  including, but not limited to (i) any extraordinary corporate
transaction  (other  than the  Merger  on the  terms  set  forth  in the  Merger
Agreement),   such   as   a   merger,   consolidation,   business   combination,
reorganization  recapitalization  or liquidation  involving the Company,  (ii) a
sale or transfer  of a material  amount of assets of the  Company,  or (iii) any
material  change in the  Company's  corporate  structure or business;  provided,
however,  that,  if the  Principal  Stockholder  is a  member  of the  Board  of
Directors of the Company,  nothing  herein shall be construed to obligate him to
act in his  capacity as a director  in any manner  which may  conflict  with his
fiduciary duties as a director of the Company.

                  In furtherance of the foregoing, (i) the Principal Stockholder
hereby appoints Acquiror and the proper officers of Acquiror,  and each of them,
with full power of  substitution  in the  premises,  his proxies to vote all his
shares of Company  Capital  Stock at any  meeting,  general or  special,  of the
stockholders  of the  Company,  and to execute one or more  written  consents or
other  instruments  from time to time in order to take such  action  without the
necessity of a meeting of the  stockholders  of the Company,  in accordance with
the  provisions  of the preceding  paragraph and (ii) Acquiror  hereby agrees to
vote such shares or execute written consents or other  instruments in accordance
with the provisions of the preceding paragraph.

                  The  proxy  and  power of  attorney  granted  herein  shall be
irrevocable  during  the term of this  Agreement,  shall be deemed to be coupled
with an interest and shall  revoke all prior  proxies  granted by the  Principal
Stockholder.  The Principal  Stockholder shall not grant any proxy to any person
which conflicts with the proxy granted herein, and any attempt to do so shall be
void.  The power of attorney  granted  herein is a durable power of attorney and
shall survive the disability or incompetence of the Principal Stockholder.

                  4.2 Appraisal Rights. The Principal  Stockholder hereby waives
his rights to appraisal under Section 262 of the DGCL with respect to any shares
of Company Stock owned by him in connection with the  transactions  contemplated
by the Merger Agreement.  The Principal  Stockholder  hereby agrees that he will
not in any way  attempt  to  influence,  encourage  or  persuade  any Person who
beneficially  owns any Company  Stock to exercise any rights to  appraisal  such
Person may have  pursuant  to Section  262 of the DGCL in  connection  with said
transactions.

                                    ARTICLE V

                                  MISCELLANEOUS

                  5.1  Termination.   Except  as  otherwise  expressly  provided
herein, this Agreement and the parties' respective  obligations  hereunder shall
terminate  upon the earlier to occur of (i) the mutual  consent of Acquiror  and
the Principal Stockholder, (ii) the termination of the Merger Agreement prior to
the  consummation  of the Merger  (except in the event of a  

                                       -9-

<PAGE>



termination  of the Merger  Agreement  pursuant  to Section  7.1(d)(i)  or (iii)
thereof,  in which case this Agreement and the parties'  respective  obligations
hereunder  shall  terminate  one  year  after  such  termination  of the  Merger
Agreement) (it being  understood  that the Principal  Stockholder's  obligations
under this  Agreement  shall not affect the  Company's  rights  under the Merger
Agreement  to  terminate  the  Merger  Agreement  in  accordance  with the terms
thereof) and (iii) the tenth anniversary of the Closing Date.

                  5.2 Amendment. This Agreement may be amended only by a written
instrument executed by the parties or their respective successors or assigns.

                  5.3 Notices. Notices, requests, permissions, waivers and other
communications  hereunder  shall be in writing  and shall be deemed to have been
duly given if signed by the  respective  persons giving them (in the case of any
corporation the signature shall be by an officer thereof) and delivered by hand,
deposited in the United States mail  (registered  or certified,  return  receipt
requested), properly addressed and postage prepaid, or delivered by telecopy:

                  If to Acquiror, to:

                  Iron Mountain Incorporated
                  745 Atlantic Avenue, 10th Floor
                  Boston, Massachusetts 02111
                  Telephone:        (617) 357-4455
                  Telecopy:         (617) 350-7881
                  Attention:        Chairman of the Board

                  with a copy to:

                  Sullivan & Worcester LLP
                  One Post Office Square
                  Boston, Massachusetts 02109
                  Telephone:        (617) 338-2800
                  Telecopy:         (617) 338-2880
                  Attention:        William J. Curry, Esq.

                  If to the Principal Stockholder, to:

                  Kent P. Dauten
                  Keystone Capital, Inc.
                  520 Lake Cook Road, Suite 450
                  Deerfield, IL  60015
                  Telephone:        (847) 236-5350
                  Telecopy:         (847) 236-9529


                                      -10-

<PAGE>



                  with a copy to:

                  Kirkland & Ellis
                  200 East Randolph Drive
                  Chicago, IL 60601
                  Telephone:        (312) 861-2000
                  Telecopy:         (312) 861-2200
                  Attention:        Edward T. Swan, Esq.

                  5.4  Counterparts.  This  Agreement  may be executed in one or
more  counterparts and each counterpart  shall be deemed to be an original,  but
all of which shall constitute one and the same original.

                  5.5 Applicable  Law. This Agreement  shall be governed by, and
construed in accordance with the laws of the State of Delaware without reference
to choice of law principles, including all matters of construction, validity and
performance.

                  5.6 Severability;  Enforcement.  The invalidity of any portion
hereof shall not affect the validity,  force or effect of the remaining portions
hereof. If it is ever held that any restriction hereunder is too broad to permit
enforcement of such restriction to its fullest extent,  each party agrees that a
court of  competent  jurisdiction  may enforce such  restriction  to the maximum
extent  permitted by law,  and each party  hereby  consents and agrees that such
scope may be  judicially  modified  accordingly  in any  proceeding  brought  to
enforce  such  restriction.  In  furtherance  of the  foregoing,  if  any  court
construes  any of the  provisions  of Section  3.6, or any part  thereof,  to be
unreasonable  because of the duration of such provision or the geographic  scope
thereof,  such court shall have the power to reduce the duration or restrict the
geographic  scope of such  provision and to enforce such provision as so reduced
or restricted.

                  5.7 Further  Assurances.  Each party hereto shall  execute and
deliver such additional documents as may be necessary or desirable to consummate
the transactions contemplated by this Agreement.

                  5.8 Parties in Interest;  Assignment.  Neither this  Agreement
nor any of the rights,  interest or obligations  hereunder  shall be assigned by
any of the  parties  hereto  without  the  prior  written  consent  of the other
parties.  Notwithstanding  the  foregoing,  for the purposes of Sections 3.5 and
3.6, the term Acquiror  shall include any Entity  controlling,  controlled by or
under  common  control  with  Acquiror,  any  successor,  by operation of law or
otherwise of Acquiror, or any entity controlling,  controlled by or under common
control with Acquiror, and any assignee of Acquiror.

                  5.9 Entire Agreement.  This Agreement and the Merger Agreement
and the Collateral  Documents  contain the entire  understanding  of the parties
hereto and thereto  with  respect to the  subject  matter  contained  herein and
therein,   and  supersede  and  cancel  all  prior   

                                      -11-

<PAGE>



agreements, negotiations, correspondence, undertakings and communications of the
parties,  oral  or  written,  respecting  such  subject  matter.  There  are  no
restrictions, promises, representations,  warranties, agreements or undertakings
of  any  party  hereto  or to the  Merger  Agreement  or  any of the  Collateral
Documents with respect to the  transactions  contemplated  by this Agreement and
the Merger  Agreement and the  Collateral  Documents  other than those set forth
herein or therein or made hereunder or thereunder.

                  5.10 Specific  Performance.  The parties hereto agree that the
remedy at law for any breach of this  Agreement  will be inadequate and that any
party by whom this  Agreement  is  enforceable  shall be  entitled  to  specific
performance in addition to any other  appropriate  relief or remedy.  Such party
may, in its sole  discretion,  apply to a court of  competent  jurisdiction  for
specific  performance  or injunctive or such other relief as such court may deem
just and proper in order to enforce  this  Agreement  or prevent  any  violation
hereof and, to the extent  permitted by  applicable  law,  each party waives any
objection to the imposition of such relief.

                  5.11 Headings;  References. The section and paragraph headings
contained in this Agreement are for reference purposes only and shall not affect
in any way the  meaning or  interpretation  of this  Agreement.  All  references
herein to "Sections" or "Exhibits"  shall be deemed to be references to Articles
or Sections hereof or Exhibits hereto unless otherwise indicated.


                     [Signatures appear on following page.]

                                      -12-

<PAGE>



                  IN WITNESS WHEREOF, each of the parties hereto has caused this
Agreement to be duly  executed and  delivered as of the day and year first above
written.

                              IRON MOUNTAIN INCORPORATED


                              By:  /s/ C. Richard Reese
                                   Name: C. Richard Reese
                                   Title: Chairman and Chief Executive Officer

                              /s/ Kent P. Dauten
                              Kent P. Dauten
         




                                                                    EXHIBIT 23.1


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



We consent to the  reference  to our firm under the  caption  "Experts"  in Iron
Mountain  Incorporated's  Registration Statement and related Prospectus filed on
or about  January 12,  1998 on Form S-4 and to the  incorporation  by  reference
therein of our reports dated  February 28, 1997 (except for Note 12, as to which
the date is September 26,  1997),  and April 30, 1997 (except for Note 15, as to
which the date is September 26, 1997) with respect to the  financial  statements
of Arcus Technology Services, Inc. and Arcus Group, Inc., respectively, included
in Iron Mountain  Incorporated's  Current  Reports on Form 8-K dated October 30,
1997 and November 25, 1997, filed with the Securities and Exchange Commission.





                                                     Ernst & Young LLP

Dallas, Texas
January 6, 1998



                                                                    EXHIBIT 23.2

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this  registration  statement on Form S-4 of our report dated April
4, 1995, for Arcus Group, Inc. included in Iron Mountain Incorporated's Form 8-K
filed with the Securities  and Exchange  Commission on November 25, 1997, and to
all references to our Firm included in this registration statement.




                                                            Arthur Andersen LLP



Houston Texas
January 5, 1998


                                                                    EXHIBIT 23.3

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



We  consent to the  reference  to our firm under the  caption  "Experts"  in the
Registration  Statement  Form  S-4  of  Iron  Mountain  Incorporated  and to the
incorporation  by reference  therein of our report dated February 21, 1997, with
respect to the  consolidated  statements  of  HIMSCORP,  Inc.  included  in Iron
Mountain Incorporated's Current Report on Form 8-K dated November 25, 1997 filed
with the Securities and Exchange Commission.





                                                              Ernst & Young LLP

Chicago, Illinois
January 5, 1998


                                                                    EXHIBIT 23.4


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this  registration  statement on Form S-4 of our report dated March
4,  1997,  (except  for Note 11, as to which the date is  October  1,  1997) for
Allegiance Business Archives, Ltd. included in Iron Mountain Incorporated's Form
8-K filed with the Securities and Exchange  Commission on November 25, 1997, and
to all references to our Firm included in this registration statement.




                                                  Stout, Causey & Horning, P.A.


Cockeysville, Maryland
January 5, 1998


                                                                    EXHIBIT 23.5


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration  statement on Form S-4 of our report dated August
7, 1997, for Records Retention/FileSafe included in Iron Mountain Incorporated's
Form 8-K filed with the Securities and Exchange Commission on November 25, 1997,
and to all references to our Firm included in this registration statement.





                                                     Abbott, Stringham & Lynch



Campbell, California
January 5, 1998


                                                                    EXHIBIT 23.6


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration statement on Form S-4 of our reports dated August
15,  1997,  April 25, 1997 and  September  12, 1997,  for  Security  Archives of
Minnesota,   Wellington   Financial   Services,   Inc.   and   Data   Securities
International, Inc., respectively, included in Iron Mountain Incorporated's Form
8-K filed with the Securities  and Exchange  Commission on October 30, 1997, and
to all references to our Firm included in this registration statement.





                                                            Arthur Andersen LLP



Minneapolis, Minnesota
Detroit, Michigan
San Jose, California
January 5, 1998



                                                                    EXHIBIT 23.7


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration  statement on Form S-4 of our report dated August
8, 1997,  for  Concorde  Group,  Inc.  and Neil  Tucker  Trust  included in Iron
Mountain  Incorporated's  Form  8-K  filed  with  the  Securities  and  Exchange
Commission  on October 30, 1997,  and to all  references to our Firm included in
this registration statement.



                                                  Fisher, Schacht & Oliver, LLP


Rochester, New York
January 5, 1998


                                                                    EXHIBIT 23.8


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration  statement on Form S-4 of our reports dated March
14, 1997, and September 6, 1996, for Safesite Records Management Corporation and
Mohawk Business Record Storage,  Inc.,  respectively,  included in Iron Mountain
Incorporated's  Form S-4/A filed with the Securities and Exchange  Commission on
May 13, 1997,  and to all  references to our Firm included in this  registration
statement.



                                                            Arthur Andersen LLP


Boston, Massachusetts
Minneapolis, Minnesota
January 5, 1998


                                                                    EXHIBIT 23.9


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration statement on Form S-4 of our report dated January
16,  1996,  for  Nashville  Vault  Company,   Ltd.  included  in  Iron  Mountain
Incorporated's  Form S-4/A filed with the Securities and Exchange  Commission on
May 13, 1997,  and to all  references to our Firm included in this  registration
statement.




                                                       Geo. S. Olive & Co. LLC



Indianapolis, Indiana
January 5, 1998


                                                                   EXHIBIT 23.10


                       CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the  incorporation by reference in the  registration  statement of
Iron  Mountain  Incorporated  on Form S-4 of our  report  dated  July 19,  1996,
(except  as to Note 11 which is as of  September  1,  1996) on our  audit of the
financial statements of International Record Storage and Retrieval Service, Inc.
as of and for the year  ended  December  31,  1995,  included  in Iron  Mountain
Incorporated's  Form S-4/A filed with the Securities  Exchange Commission on May
13,  1997,  and the  reference  in this  registration  statement  to our Firm as
experts.





                                                Rothstein, Kass & Company, P.C.

Roseland, New Jersey
January 5, 1998


                                                                   EXHIBIT 23.11

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this registration  statement on Form S-4 of our reports dated March
4, 1997, (except for Note 11.a. and e. for which the date is March 19, 1997) for
Iron Mountain  Incorporated  included in Iron Mountain  Incorporated's Form 10-K
filed with the Securities and Exchange  Commission on March 28, 1997, and to all
references to our Firm included in this registration statement.




                                                            Arthur Andersen LLP



Boston, Massachusetts
January 5, 1998



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