IRON MOUNTAIN INC /DE
424B3, 1998-01-27
PUBLIC WAREHOUSING & STORAGE
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                                                                    424(b)(3)
                                                   Registration No. 333-44187
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 January 20, 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 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.  Any such  statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.

                                        2

<PAGE>




         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 records  management  capability of
its  current  and  potential  customers.  There can be no  assurance  that these
organizations will outsource more of their records management needs

                                        6
<PAGE>
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 predicted.
Based on its present assessment of the situation,  after consultation with legal

                                        7
<PAGE>
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.

         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

                                        8
<PAGE>
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.

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

                                        9
<PAGE>

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.

         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

                                       10

<PAGE>



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 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

                                       11

<PAGE>



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.

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.


                                       12

<PAGE>



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.

         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.


                                       13

<PAGE>



         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.

         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.

                                       14

<PAGE>



         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 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


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