IRON MOUNTAIN INC /DE
424B3, 1998-12-01
PUBLIC WAREHOUSING & STORAGE
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                                                                       424(b)(3)
                                                      Registration No. 333-67765

PROSPECTUS


                                2,500,000 Shares
                           Iron Mountain Incorporated
                                  Common Stock
                             ----------------------

         This Prospectus  relates to the issuance from time to time of shares of
common  stock of Iron  Mountain  Incorporated  in an  aggregate  amount of up to
2,500,000 shares. The terms of each issuance are to be determined at the time of
each offering.

         We will  offer  the  common  stock  directly  in  connection  with  the
acquisition  of the assets  of, or  ownership  interests  in,  certain  entities
involved  in the  same  or  similar  lines  of  business  as  ours or any of our
subsidiaries.  We will negotiate the terms of an acquisition  with the owners or
controlling persons of the assets or ownership interests we seek to acquire.

         We expect that the common stock issued in any such  acquisition will be
valued at a price  reasonably  related to the market value of our common  stock,
either at the time the terms of the acquisitions are tentatively agreed upon, at
or about the time of the closing of the acquisitions,  or during a set period or
periods prior to the closing of the acquisitions.

         Our common stock is traded on the Nasdaq  National  Market System under
the symbol "IMTN." Our principal  executive  offices are located at 745 Atlantic
Avenue, Boston, Massachusetts 02111. Our telephone number is (617) 535-4766.

         We do not  expect  to pay  underwriting  discounts  or  commissions  in
connection with each offering.

                             ----------------------

         See "RISK  FACTORS"  at page 5 for certain  information  that should be
considered by prospective investors.


Neither  the  Securities  and  Exchange  Commission  nor  any  state  securities
commission has approved or  disapproved  of these  securities or passed upon the
adequacy or accuracy of this Prospectus. Any representation to the contrary is a
criminal offense.
                             ----------------------



                The date of this Prospectus is December 1, 1998.


<PAGE>

         You should rely only on the  information  incorporated  by reference or
provided in this Prospectus.  We have not authorized  anyone else to provide you
with different  information.  We are not making an offer of these  securities in
any  jurisdiction  where  it  is  unlawful.  You  should  not  assume  that  the
information in this Prospectus is accurate as of any date other than the date on
the front of this document.

                             -----------------------


                                TABLE OF CONTENTS

                                                                  Page
About This Prospectus                                               3
Where You Can Find Additional Information                           3
Incorporation of Certain Documents by Reference                     3
The Company                                                         4
The Acquisitions                                                    4
Risk Factors                                                        5
Selected Consolidated Financial and Operating Information           11
Description of Capital Stock                                        13
Delaware General Corporation Law and Certain Provisions
  of the Restated Certificate of Incorporation and the By-laws      15
Legal Matters                                                       17
Experts                                                             17


                             -----------------------


         This   Prospectus   incorporates   important   business  and  financial
information  about Iron Mountain that is not included in or delivered  with this
document.  You may obtain this  information at no cost by writing or telephoning
us at the following address:

                               John F. Kenny, Jr.
                          Executive Vice President and
                             Chief Financial Officer
                           Iron Mountain Incorporated
                               745 Atlantic Avenue
                           Boston, Massachusetts 02111
                                 (617) 535-4766

         To obtain timely delivery, you must request the information by no later
than five business days before you must make your investment decision.


                                        2

<PAGE>

ABOUT THIS PROSPECTUS

     This Prospectus is part of a registration  statement that we filed with the
SEC using a "shelf" registration process with respect to the common stock. Under
this shelf process we may sell, in one or more  offerings,  shares of our common
stock up to a total of 2,500,000 shares. This Prospectus does not contain all of
the  information  contained  in the  Registration  Statement.  Accordingly,  for
further information  concerning Iron Mountain and the common stock, reference is
also made to the Registration Statement. Statements in this Prospectus regarding
the contents of any contract or other document are not necessarily complete, and
in each instance reference is made to the copy of the contract or other document
filed as an exhibit to the Registration Statement.


WHERE YOU CAN FIND ADDITIONAL INFORMATION

     We are subject to the informational requirements of the Securities Exchange
Act of 1934, as amended, and, accordingly,  file annual,  quarterly, and current
reports,  proxy  statements and other  information with the SEC. You can inspect
and obtain  copies of the  Registration  Statement,  the exhibits and  schedules
which  form a  part  of the  Registration  Statement,  and  the  reports,  proxy
statements and other  information filed by us with the SEC, at prescribed rates,
at the public  reference  facilities  maintained by the SEC at Judiciary  Plaza,
Room 1024, 450 Fifth Street, N.W.,  Washington,  D.C. 20549. Please call the SEC
at 1-800-SEC-0330 for further  information on the public reference room. The SEC
maintains a World Wide Web site that  contains  reports,  proxy and  information
statements and other information regarding registrants, including Iron Mountain,
that  file   electronically   with  the  SEC.   The   address  of  the  site  is
http://www.sec.gov.


INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The SEC allows us to  "incorporate  by reference"  the  information we file
with them,  which means that we can  disclose  important  information  to you by
referring you to those documents.  The information  incorporated by reference is
considered to be part of this Prospectus,  and later  information filed with the
SEC will update and supersede this information.  We incorporate by reference the
documents  listed  below  and any  future  filings  made  with the SEC (File No.
0-27584)  under Section  13(a),  13(c),  14 or 15(d) of the Exchange Act of 1934
until our offering is completed.

          o    Annual Report on Form 10-K for the fiscal year ended December 31,
               1997;

          o    Quarterly  Reports on Form 10-Q for the quarters  ended March 31,
               1998, June 30, 1998 and September 30, 1998;

          o    Current  Reports on Form 8-K dated January 6, 1998,  February 18,
               1998  (amended  April 7, 1998),  March 9, 1998,  March 30,  1998,
               April 21, 1998, July 10, 1998 (amended August 7, 1998), September
               18, 1998 and November 23, 1998;

          o    The description of the common stock contained in our Registration
               Statement on Form 8-A dated January 18, 1996;

          o    The  financial   statements  for  Safesite   Records   Management
               Corporation  included  in 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 SEC on May 14, 1997,  and the
               unaudited  financial  statements of Safesite  Records  Management
               Corporation as of March 31, 1997 and for the three months ended

                                        3

<PAGE>



               March 31, 1996 and 1997  contained in the Current  Report on Form
               8- K/A dated August 26, 1997;

          o    The  financial  information  for Security  Archives of Minnesota,
               Wellington  Financial  Services,  Inc.,  Concorde Group, Inc. and
               Neil  Tucker  Trust,  and  Data  Securities  International,  Inc.
               contained  in the  Current  Report on Form 8-K dated  October 30,
               1997; and

          o    The financial  information  for Records  Retention/FileSafe,  LP,
               Allegiance  Business  Archives,  Ltd.,  and  HIMSCORP,  Inc.  and
               Subsidiaries  contained  in the Current  Report on Form 8-K dated
               November 25, 1997.


THE COMPANY

     Iron Mountain is America's largest records management  company, as measured
by its revenues. We are a national,  full-service provider of records management
and  related  services,  enabling  customers  to  outsource  records  management
functions. We have 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.  We provide 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.  The principal
services provided to our storage customers include courier pick-up and delivery,
filing,  retrieval and destruction of records,  database management,  customized
reporting  and disaster  recovery  support.  We also sell storage  materials and
provide 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. Our principal  executive  offices are located at 745
Atlantic  Avenue,  Boston,  Massachusetts  02111.  Our telephone number is (617)
535-4766.


THE ACQUISITIONS

     We will offer the common stock  registered  hereby in  connection  with our
acquisitions  of records  management  companies and companies that offer related
services.  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  us and the  owners  or
controlling  persons of the assets or ownership  interests  to be  acquired.  In
addition,  we 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.

     We will  consider  the  following  factors,  among  others,  when we decide
whether to acquire a business:  (1) the quality and  reputation of the business,
(2) the  assets,  liabilities,  results  of  operations  and cash  flows for the
business,  (3) the quality of its  management  and  employees,  (4) its earnings
potential, (5) the geographic locations of the business and (6) the market value
of our common stock when pertinent.


                                        4

<PAGE>



RISK FACTORS

     Before you invest in our common  stock,  you should be aware that there are
various risks,  including those described below.  You should consider  carefully
these risk factors  together  with all of the other  information  included in or
incorporated  into this  Prospectus  before you decide to purchase shares of our
common stock.

     Some of the information  contained in or incorporated  into this Prospectus
may include forward-looking statements. Such statements can be identified by the
use  of   forward-looking   terminology   such  as  "may,"   "will,"   "expect,"
"anticipate,"  "believe" or other similar words.  These  statements  discuss our
current expectations, goals, beliefs and plans regarding the financial condition
or results of operations of Iron Mountain or other non-historical facts.

     By  their  nature,  such  forward-looking   statements  include  risks  and
uncertainties. When considering such forward-looking statements, you should keep
in mind the risk factors set forth below and the cautionary  statements included
elsewhere in this  Prospectus or in documents  that are  incorporated  into this
Prospectus. Such risk factors and other factors identified in this Prospectus or
in the documents  that are  incorporated  into this  Prospectus  could cause our
actual results to differ  materially  from those expressed in or implied by such
forward-looking  statements. If we revise any of our forward-looking  statements
to reflect future events or  circumstances,  we will not always publicly release
our revised statements.

Risks Associated with Acquisition Strategy

     As part of our growth strategy, we have acquired,  and expect to acquire in
the future,  records management  businesses and businesses that provide services
related to records management.  This growth strategy involves certain risks, and
we may be unable to pursue such a strategy in the future. For example, we may be
unable to:

          o    identify suitable companies to acquire;

          o    arrange  suitable  financing  to  provide  us with  the  funds to
               acquire such companies; or

          o    incur additional debt necessary to acquire such companies,  if we
               are unable to pay the purchase price out of working capital or to
               pay all or part of the  purchase  price with our common  stock or
               other equity securities.

     The success of any completed  acquisition depends in part on our ability to
integrate  effectively the acquired  company into Iron Mountain.  The process of
integrating such acquired businesses may involve unforeseen difficulties and may
require  a  disproportionate  amount  of  our  management's  attention  and  our
financial and other  resources.  We may be unable to successfully  integrate our
recent acquisitions or possible future acquisitions.

     The  lenders  under  our  credit   agreement   must   pre-approve   certain
acquisitions. If we propose to acquire one company for a purchase price over $65
million or if we propose to acquire  multiple  companies in a given year and the
aggregate purchase price exceeds $150 million in cash and other consideration or
$100 million in cash, then lenders holding 51% or more of the commitments  under
our credit agreement must approve such acquisition or acquisitions.  The lenders
could withhold their consent on acquisitions that Iron Mountain proposes to make
in excess of such limits.

     Our operating results may fluctuate  substantially  from quarter to quarter
due to the size, timing and integration of possible future

                                        5

<PAGE>

acquisitions.  As a result,  operating  results for any quarter may not indicate
the results that may be achieved for any subsequent fiscal quarter or for a full
fiscal year.

Competition

     We compete with one or more  records  management  service  providers in all
geographic areas where we operate.  We believe that competition for customers is
based on price,  reputation  for  reliability,  quality of service and scope and
scale of technology  and that we generally  compete  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 we
believe that this pricing climate is stabilizing,  prices could decline further,
as competitors  seek to gain or preserve market share. A further  downward trend
in pricing, if it continues for an extended period of time, could materially and
adversely affect our results of operations.

     Iron  Mountain  also  competes  for  companies  to  acquire.  Some  of  our
competitors  may possess  greater  financial and other resources than us. If any
such competitor were to devote  additional  resources to the records  management
business  and such  acquisition  candidates  or  focused  its  strategy  on Iron
Mountain's markets, our results of operations could be adversely affected.

     In addition,  we compete with the internal records management capability of
our current and potential  customers.  We can provide no  assurances  that these
organizations will use an outside company such as Iron Mountain for their future
records management. In addition, such organizations could bring in-house some or
all of the functions they currently outsource to Iron Mountain.

Alternative Technologies

     We derive  most of our  revenues  from the storage of paper  documents  and
related services. Such storage requires significant physical space.  Alternative
technologies  for  generating,  capturing,  managing,  transmitting  and storing
information  exist, many of which require  significantly  less space than paper.
Such technologies include computer media,  microforms,  CD-ROM and optical disk.
To date,  none of these  technologies  has replaced paper as the principal means
for  storing  information.  However,  we can  provide  no  assurances  that  our
customers  will  continue  to store  most of their  records in paper  format.  A
significant  shift by our customers to storage of data through  non-paper  based
technologies  (whether now existing or developed in the future) could  adversely
affect our business.

Financial Leverage; Debt Service Requirements

     We have a significant level of debt due to the substantial  indebtedness we
have incurred  primarily to finance  acquisitions and expand our operations.  We
expect to continue to borrow  under our credit  agreement  and  possible  future
credit  arrangements in order to finance  possible future  acquisitions  and for
general corporate purposes.

     Our ability to make  principal  and interest  payments on our  indebtedness
depends upon our future  operating  results,  which we cannot  entirely  control
because they are tied to both internal and external forces.  Our high debt level
could have important consequences, including the following:

          o    we may not be able to  obtain  additional  financing  for  future
               working  capital  needs or for possible  future  acquisitions  or
               other purposes;


                                        6

<PAGE>

          o    the  required   payments  of   principal   and  interest  on  our
               indebtedness may reduce funds available for other purposes;

          o    we may be vulnerable to a downturn in our operating performance;

          o    we may be more sensitive to adverse economic conditions than some
               of our competitors; and

          o    we may  be  limited  in  our  ability  to  withstand  competitive
               pressures.

     Our debt  service  absorbs  a  substantial  portion  of our cash  flow from
operations.  We  believe,  but can  provide no  assurances,  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.  Moreover,  borrowings under the credit agreement bear interest at
rates that  fluctuate.  Any increases in interest rates on borrowings  under the
credit agreement increases our debt service payments.  If our cash flow were not
sufficient to meet our debt service  requirements  or payments of principal,  we
could  be  required  to  sell  additional  equity   securities,   refinance  our
obligations  or  dispose  of assets in order to make  scheduled  payments.  Iron
Mountain  may  not be  able  to  effect  any of  such  transactions  or do so on
favorable terms.

Casualty

     We  maintain  comprehensive  liability,   fire,  flood,  earthquake  (where
appropriate) and extended coverage insurance with respect to the properties that
we own or lease,  to the extent such  insurance  is  available  on  commercially
reasonable  terms,  with customary limits and  deductibles.  We will continue to
maintain  such  insurance.  We  may be  unable  to  obtain  full  coverage  on a
cost-effective  basis for some  casualties,  such as  earthquakes,  or we may be
unable to obtain any insurance for certain losses, such as losses from riots. In
the past we have suffered  damages and losses from an  earthquake  and a riot in
California, which were substantially covered by insurance.

     In March 1997, three fires extensively damaged one and destroyed another of
our records management facilities in South Brunswick Township,  New Jersey. Some
of our  customers or their  insurance  carriers  have  asserted  claims or filed
lawsuits  against us as a consequence  of the  destruction of or damage to their
records due to the fires.  We cannot  predict  the  outcome of these  claims and
proceedings.   Based  on  our  present   assessment  of  the  situation,   after
consultation  with legal  counsel,  we do 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  we can  provide no
assurances in this regard.

     In the future, should uninsured losses or damages occur, we could lose both
our  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.  Any such loss could
materially adversely affect our financial condition or results of operations.

History of Losses; EBITDA Objective

     In the  past,  our  results  of  operations  have  resulted  in net  losses
applicable  to  common  stockholders.  We  attribute  such  losses  in  part  to
significant  non-cash  charges against income for  depreciation and amortization
expenses  associated  with  expansion  of  our  storage  capacity  and  goodwill
amortization  associated  with  acquisitions  accounted  for under the  purchase
method.  We incur these  non-cash  charges  because of our growth  strategy.  In
addition, in the past, two extraordinary

                                        7
<PAGE>

expenses  negatively  impacted net income applicable to common  stockholders:  a
charge for  accretion  of a redeemable  put warrant and a charge  related to the
early  retirement of debt in 1996. We redeemed the put warrant in February 1996,
upon  completion  of our initial  public  offering.  In the  future,  our growth
strategy  could result in further net losses due to increased  interest  expense
associated with borrowings under our credit agreement and possible future credit
arrangements and increased depreciation and amortization expenses.

     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.
Increasing net income and net income  applicable to common  stockholders  is not
our focus. In the past, we have experienced a growth in EBITDA, while net losses
applicable to common stockholders have increased. Based on our experience in the
records  management  industry,  we believe 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. Our financing agreements contain covenants in which EBITDA
is  the  measure  of  financial   performance.   Other   measures  of  financial
performance,   such  as  net  income  and  net  income   applicable   to  common
stockholders,  have been negatively  affected by our pursuit of increased EBITDA
and may be negatively affected in the future.

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

     Certain provisions of our Restated Certificate of Incorporation and By-Laws
could have the effect of discouraging or precluding acquisition of control of us
by a third  party  and  could  render  the  consummation  of  certain  types  of
transactions  involving  an  actual  or  potential  change  in  control  of Iron
Mountain, such as a merger, tender offer or proxy contest, more difficult.

     Staggered  Board.  The Board of Directors is divided into three  classes of
Directors,  elected on a  staggered  basis (one class per year).  A third  party
would have to successfully  elect its directors at two consecutive  stockholders
meetings at which  directors  were elected in order to replace a majority of the
members of the Board.  This means that  existing  management  would control Iron
Mountain during such period.

     Preferred  Stock.  The Board may issue up to 2,000,000  shares of preferred
stock  without  stockholder  approval.  The  Board may  determine  the terms and
conditions  of any issuance of preferred  stock and the rights,  privileges  and
preferences  (including  the right to vote and the right to convert  into common
stock) of the preferred stock.

     Restrictions on Transfer.  The By-Laws prohibit the transfer by the holders
of  approximately  2,200,000  shares of common  stock  that were  issued by Iron
Mountain in one  acquisition.  The  restrictions  on transfer  expire in January
1999. A significant portion of such shares are held by an affiliate.

     Mandatory  Redemption  of Notes.  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 and $250,000,000 in

                                        8

<PAGE>

aggregate  principal amount of 8 3/4% Senior  Subordinated Notes due 2009 issued
in October  1997.  If a change of control of Iron  Mountain  (as  defined in the
indentures  for  the  Notes)  occurs,  we  must  offer  to  purchase  all of the
outstanding  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. We can provide no assurances that we would be able to obtain the funds
for such a  redemption  through a  refinancing  of the Notes to be  purchased or
otherwise,  or that the purchase would be permitted under our credit  agreement.
Also,  the  requirement  that we make an offer to purchase all of the Notes then
outstanding  in the event of a change of  control  may deter a third  party from
effecting a transaction that would constitute a change of control.

Control by Principal Stockholders

     The voting power held by certain of our large  stockholders  may discourage
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,  such stockholders'  voting power gives them 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

     Various federal,  state and local environmental laws impose liability on an
owner of real  estate  for the costs of  investigation  and  cleanup of soil and
groundwater  contaminated by certain hazardous substances or wastes or petroleum
products.  These laws also impose liability on lessees conducting  operations on
contaminated  real  estate.  Some of these  environmental  laws  impose  cleanup
liability  without regard to whether the owner or operator of the real estate or
operations knew of or was responsible for the contamination.  Moreover,  some of
these laws impose liability  whether or not operations at the property have been
discontinued  or title to the property has been  transferred.  In addition,  the
presence of contamination, or the failure to properly cleanup 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. Third parties
may make claims against the owner or operator of contaminated  real estate 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. Such laws may impose liability for release of
asbestos-containing  materials  and may  enable  third  parties to sue owners or
operators of real estate for personal  injury  associated  with exposure to such
substances. Certain of our facilities contain or may contain asbestos-containing
materials,  but we believe that such  materials are in  acceptable  condition at
this time. We believe that future costs related to any removal or  encapsulation
of asbestos-containing materials at our facilities will not be material.

     In addition,  certain of our current and former  properties  that we now or
formerly owned or operated 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.  In some  instances  these
properties  included the operation of underground  storage tanks.  Iron Mountain
may be potentially liable for environmental costs such as those discussed above.

     We have from time to time conducted  limited  environmental  investigations
and remedial activities at certain of our former and

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<PAGE>


current facilities,  but we have not undertaken an in-depth environmental review
of all of our properties.

     We  believe  that we are in  substantial  compliance  with  all  applicable
material  environmental  laws.  Moreover,  we are  not  aware  of  any  material
liability  relating to contamination at any of our current or former properties.
We cannot,  however, rule out the possibility that environmental  conditions for
which Iron  Mountain  might be liable exist at such  properties or at properties
which we may acquire in future  acquisitions.  In  addition,  future  regulatory
action and environmental laws may impose costs for environmental compliance that
do not exist today.  These future events could have a material adverse effect on
our financial condition and results of operations.

No Intention to Pay Dividends

     We have never  declared or paid cash  dividends  on our capital  stock.  We
intend to retain future  earnings for use in our business and do not  anticipate
declaring  or  paying  any cash  dividends  on  shares  of  common  stock in the
foreseeable future. In addition,  we are currently restricted under the terms of
our credit  agreement and the  indentures for the Notes from declaring or paying
cash dividends on our common stock.


                                       10

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

         We derived the following selected consolidated statements of operations
and  balance  sheet data of Iron  Mountain as of and for each of the years ended
December  31,  1993,  1994,  1995,  1996 and 1997 from our audited  consolidated
financial statements.  We have restated this selected consolidated financial and
operating  information  to reflect a  three-for-two  stock split effected in the
form of a stock dividend on our common stock, which was approved by the Board on
June 30,  1998.  Shares  of common  stock  were  issued on July 31,  1998 to all
stockholders  of record as of the close of business on July 17, 1998. We derived
the selected  consolidated  statements of  operations  and balance sheet data of
Iron  Mountain as of and for the nine months ended  September  30, 1997 and 1998
from our unaudited condensed  consolidated  financial statements.  Our unaudited
condensed consolidated financial statements include all adjustments,  consisting
of normal recurring accruals, that we consider 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,  1998  are not
necessarily  indicative  of the results for the entire year ending  December 31,
1998.  You  should  read  the  selected  consolidated  financial  and  operating
information  set forth  below in  conjunction  with our  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,
                                                    ----------------------------------------------------      ---------------------
                                                     1993       1994       1995       1996          1997        1997         1998
                                                    -------   -------    --------   --------     --------     --------     --------
<S>                                                <C>       <C>        <C>        <C>          <C>          <C>          <C>
Consolidated Statements of Operations Data:
Revenues:
   Storage ......................................   $48,892   $54,098    $ 64,165   $ 85,826     $125,968     $ 86,199     $168,046
   Service and Storage Material Sales ...........    32,781    33,520      40,271     52,892       82,797       57,195      142,461
                                                    -------   -------    --------   --------     --------     --------     --------
     Total Revenues .............................    81,673    87,618     104,436    138,718      208,765      143,394      310,507
Operating Expenses:
   Cost of Sales (Excluding Depreciation) .......    43,054    45,880      52,277     70,747      106,879       73,742      162,609
   Selling, General and Administrative ..........    19,971    20,853      26,035     34,342       51,668       35,682       76,666
   Depreciation and Amortization ................     6,789     8,690      12,341     16,936       27,107       18,495       36,225
                                                    -------   -------    --------   --------     --------     --------     --------
     Total Operating Expenses ...................    69,814    75,423      90,653    122,025      185,654      127,919      275,500
                                                    -------   -------    --------   --------     --------     --------     --------
Operating Income ................................    11,859    12,195      13,783     16,693       23,111       15,475       35,007
Interest Expense ................................     8,203     8,954      11,838     14,901       27,712       17,631       34,228
Other Income(5) .................................      --        --          --         --           --           --          1,700
                                                    -------   -------    --------   --------     --------     --------     --------
Income (Loss) Before Provision (Credit)
   for Income Taxes .............................     3,656     3,241       1,945      1,792       (4,601)      (2,156)       2,479
Provision (Credit) for Income Taxes .............     2,088     1,957       1,697      1,435          (80)        (346)       4,123
                                                    -------   -------    --------   --------     --------     --------     --------
Income (Loss) Before Extraordinary Charge .......     1,568     1,284         248        357       (4,521)      (1,810)      (1,644)
Extraordinary Charge, Net of Tax Benefit(1)......      --        --          --        2,126         --           --           --
                                                    -------   -------    --------   --------     --------     --------     --------
Net Income (Loss) ...............................     1,568     1,284         248     (1,769)      (4,521)      (1,810)      (1,644)
Accretion of Redeemable Put Warrant .............       940     1,412       2,107        280         --           --           --
                                                    -------   -------    --------   --------     --------     --------     --------
Net Income (Loss) Applicable to Common
   Stockholders .................................   $   628   $  (128)   $ (1,859)  $ (2,049)    $ (4,521)    $ (1,810)    $ (1,644)
                                                    =======   =======    ========   ========     ========     ========     ========
Income (Loss) per Common Share:
Basic:
   Income (Loss) Before Extraordinary Charge......  $  9.10   $ (0.40)   $ (32.61)  $   0.00     $  (0.26)    $  (0.11)    $  (0.06)
   Extraordinary Charge, Net of Tax Benefit (1)...     --        --          --        (0.15)        --           --           --
                                                    -------   -------    --------   --------     --------     --------     --------
   Net Income (Loss) Applicable to Common
      Stockholders ...............................  $  9.10   $ (0.40)   $ (32.61)  $  (0.15)    $  (0.26)    $  (0.11)    $  (0.06)
                                                    =======   =======    ========   ========     ========     ========     ========
   Weighted Average Common Shares Outstanding ....       69       321          57     13,911       17,172       16,359       26,848
                                                    =======   =======    ========   ========     ========     ========     ========

                                                                 11
<PAGE>
<CAPTION>
                                                                                                                   Nine Months  
                                                                Year Ended December 31,                         Ended September 30,
                                                    -----------------------------------------------------    ----------------------
                                                     1993       1994       1995       1996          1997        1997         1998
                                                    -------   -------    --------   --------     --------     --------     --------
<S>                                                <C>       <C>        <C>        <C>          <C>          <C>          <C>

Diluted:
   Income (Loss) Before Extraordinary Charge......  $  0.05   $ (0.40)  $  (32.61)  $   0.00     $  (0.26)    $  (0.11)    $  (0.06)
   Extraordinary Charge, Net of Tax Benefit(1)....     --        --          --        (0.15)        --           --           --
                                                    -------   -------    --------   --------     --------     --------     --------
   Net Income (Loss) Applicable to Common
      Stockholders ...............................  $  0.05   $ (0.40)   $ (32.61)  $  (0.15)    $  (0.26)    $  (0.11)    $  (0.06)
                                                    =======   =======    ========   ========     ========     ========     ========
   Weighted Average Common Shares Outstanding.....   12,101       321          57     13,911       17,172       16,359       26,848
                                                    =======   =======    ========   ========     ========     ========     ========
Pro Forma(6):
   Net Income (Loss) Applicable to Common 
      Stockholders................................  $  0.08   $ (0.01)   $  (0.16)  $  (0.13)    $  (0.26)    $  (0.11)    $  (0.06)
                                                    =======   =======    ========   ========     ========     ========     ========
   Weighted Average Common Shares Outstanding.....   12,101    11,976      11,676     15,206       17,172       16,359       26,848
                                                    =======   =======    ========   ========     ========     ========     ========
Other Data:
EBITDA(2) .......................................   $18,648   $20,885    $ 26,124   $ 33,629     $ 50,218     $ 33,970     $ 71,232
EBITDA as a Percentage of Total Revenues ........      22.8%     23.8%       25.0%      24.2%        24.1%        23.7%        22.9%
Capital Expenditures:
   Growth (3)(4) ................................   $13,605   $15,829    $ 14,395   $ 23,334     $ 37,082     $ 20,074     $ 36,259
   Maintenance ..................................     1,846     1,151         858      1,112        1,238          544          960
                                                    -------   -------    --------   --------     --------     --------     --------
Total Capital Expenditures(4) ...................   $15,451   $16,980    $ 15,253   $ 24,446     $ 38,320     $ 20,618     $ 37,219
                                                    =======   =======    ========   ========     ========     ========     ========
Additions to Customer Acquisition Costs..........   $   922   $ 1,366    $  1,379   $  1,642     $  1,635     $    688     $  2,326

<CAPTION>                                                                                 
                                                               As of December 31,                       As of     
                                               ----------------------------------------------------  September 30,
                                                 1993       1994       1995       1996       1997       1998
                                               ---------  --------   --------   --------   --------  -------------
<S>                                           <C>        <C>        <C>        <C>        <C>        <C>
Consolidated Balance Sheet Data:
Cash and Cash Equivalents ......               $    591   $  1,303   $  1,585   $  3,453   $ 24,510   $    522
Total Assets ...................                125,288    136,859    186,881    281,799    636,786    894,706
Total Debt .....................                 78,460     86,258    121,874    184,733    428,018    443,189
Stockholders' Equity ...........                 24,047     22,869     21,011     52,384    137,733    340,460
                                          
<FN>
- ---------------
(first and fifth footnotes from the preceding page)

(1)  The  extraordinary  charge for 1996 relates to the early retirement of certain debt and 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 our  experience  in the records  management  industry,  we believe 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  substantially  all of our  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 our  performance or to cash flow from  operations  (as  determined in accordance  with GAAP) as a
     measure of liquidity.
(3)  Growth capital expenditures consist primarily of investments in racking systems,  management information systems, new buildings
     and improvements to existing facilities.
(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.
(5)  Other income for the nine month  period ended  September  30, 1998 is  comprised  of a $1.7  million  gain  resulting  from the
     settlement of several insurance claims related to the March 1997 fires at our South Brunswick Township, New Jersey facilities.
(6)  Represents pro forma earnings per share as if the preferred  stock that was converted into common stock in connection  with our
     initial public offering had been converted for all periods presented.
</FN>
</TABLE>

                                                        12

<PAGE>

DESCRIPTION OF CAPITAL STOCK

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

     Our  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, and
2,000,000  shares of  preferred  stock,  $.01 par value per share.  No shares of
preferred stock have been issued.  There were 29,291,033  shares of common stock
held by 343 holders of record and no shares of nonvoting common stock issued and
outstanding as of November 20, 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 Board of Directors are entitled to receive
such  dividends as may be declared by the 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).

     We are currently restricted under the terms of our credit agreement and the
indenture  for our  outstanding  senior  subordinated  notes  from  paying  cash
dividends on the common stock and nonvoting common stock.  Even if funds were to
be available, we do 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 of Incorporation,  the vote of holders of at
least 66 2/3% 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,  is required to amend or repeal the  provisions  of the  Restated
Certificate of Incorporation  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 66 2/3%
vote.  See  "Delaware  General  Corporation  Law and Certain  Provisions  of the
Restated  Certificate of Incorporation and the By-Laws." There are no cumulative
voting rights in the election of the Board of Directors.

     Conversion  Provisions.  Shares of nonvoting  common stock may be converted
into  shares  of  common  stock at any time at the  option  of the  holder  on a
share-for-share  basis  without  the  payment of any  additional  consideration.
However,  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 of a "bank holding  company" 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 the Bank Holding Company Act.

     Liquidation  Rights.  Upon  liquidation,  dissolution or winding-up of Iron
Mountain,

                                       13

<PAGE>


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 the 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 Board of  Directors  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 any currently  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 Board of
Directors may authorize including, but not limited to:

          o    the  distinctive  designation  of each  series  and the number of
               shares that will constitute such series;

          o    the voting rights, if any, of shares of such series;

          o    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;

          o    the prices at which,  and the terms and conditions on which,  the
               shares  of  such  series  may be  redeemed,  if such  shares  are
               redeemable;

          o    the purchase or sinking fund provisions, if any, for the purchase
               or redemption of shares of such series;

          o    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

          o    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.

     We currently have no intention to issue shares of preferred stock. However,
the issuance of preferred stock, or the issuance of rights to purchase preferred
stock, could discourage an unsolicited  acquisition proposal. If we issue shares
of preferred stock in the future, the rights of holders of common stock

                                       14

<PAGE>

will be subject to, and may be  adversely  affected by, the rights of holders of
any preferred stock.


DELAWARE  GENERAL  CORPORATION  LAW  AND  CERTAIN  PROVISIONS  OF  THE  RESTATED
CERTIFICATE OF INCORPORATION AND THE BY-LAWS

     The Restated  Certificate of Incorporation  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. We believe that the benefits of increased protection of our 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 of  Incorporation  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 Board of  Directors,  but shall consist of not more
than fifteen nor less than three Directors. The classified Board of Directors is
intended to promote  continuity  and  stability of our  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 our  business  and  ensures the quality of our  business
operations.  The  classification  of Directors  has the effect of making it more
difficult  to change the  composition  of the Board of  Directors.  At least two
annual  stockholder  meetings,  instead of one,  would be  required  to effect a
change in the majority control of the Board of Directors, except in the event of
vacancies  resulting  from removal (in which case the remaining  Directors  will
fill the vacancies created by the removal). See "--Removal of Directors; Filling
Vacancies on the Iron Mountain Board."

Removal of Directors; Filling Vacancies on the Iron Mountain Board

     Our  Restated  Certificate  of  Incorporation  and By-Laws  provide  that a
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 of Incorporation both provide that
a vacancy on the Board of Directors,  including a vacancy created by an increase
in the size of the  Board of  Directors  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  of
Incorporation  also provides that any Director elected by the Board of Directors
to replace another Director of a given class of Directors will hold office until
the next election of that Director's class.  These provisions are to ensure that
a  third  party  would  be  precluded  from  removing  incumbent  Directors  and
simultaneously  gaining  control  of the  Board  of  Directors  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
Board of Directors for cause.

                                       15

<PAGE>

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

     The  Restated   Certificate  of  Incorporation   and  the  By-Laws  contain
provisions  requiring the affirmative vote of the holders of at least 66 2/3% of
the voting power to amend  certain  provisions  of the Restated  Certificate  of
Incorporation and the By-Laws.  This  supermajority  voting provision applies to
(1) the provisions of the Restated  Certificate of  Incorporation  setting forth
the  capitalization  of Iron  Mountain,  (2)  the  provisions  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  Delaware  General  Corporation  Law  (the  "DGCL"),  (3) the  provisions
allowing for the  indemnification of officers and Directors of Iron Mountain and
(4) the supermajority voting provision.

     In addition,  the Restated  Certificate of Incorporation  provides that the
By-Laws may be amended  only by a majority of the full Board of  Directors or by
the stockholders holding at least 66 2/3% 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.  Our Restated  Certificate of Incorporation  includes
such a provision. Under the Restated Certificate of Incorporation,  at least 80%
of the voting power is required to approve amendments to those provisions of the
By-Laws (1) establishing a classified Board, (2) specifying notice  requirements
for   stockholder   nominations  of  Directors,   (3)  limiting  the  rights  of
stockholders to remove or nominate  Directors or to bring business before annual
meetings of  stockholders,  (4) filling  vacancies on the Board of Directors and
(5) providing for limitations on calling special meetings of the stockholders.

Stockholder Actions and Meetings

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

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 (1) 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,  (2) 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
(3) 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 66
2/3% of the  outstanding  voting  stock  which is not  owned  by the  interested
stockholder.


                                       16

<PAGE>


     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.  However,  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  of  Incorporation  and the By-Laws do not
exclude us 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
Board of Directors.


LEGAL MATTERS

     The validity of the shares of common stock offered by this  Prospectus have
been passed upon for us by Sullivan & Worcester LLP, Boston, Massachusetts. Jas.
Murray Howe,  Secretary of Iron Mountain,  is of counsel to Sullivan & Worcester
LLP and beneficially owns 15,000 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, 1997,
included in Iron  Mountain's  Annual  Report on Form 10-K,  have been audited by
Arthur  Andersen  LLP,  independent  public  accountants,  as indicated 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 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 indicated 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  indicated  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  indicated  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.


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<PAGE>



     The financial  statements of Concorde Group, Inc. and Neil Tucker 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 indicated 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  indicated  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  indicated  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  indicated  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 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 Report on Form 8-K dated
November 25, 1997,  have been audited by Ernst & Young LLP,  independent  public
accountants,  as  indicated  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 consolidated  financial statements of Arcus Technology  Services,  Inc.
for the  years  ended  December  31,  1997 and 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,  appearing in
Iron  Mountain's  Current  Report on Form 8-K  dated  March 9,  1998,  have been
audited by Ernst & Young LLP,  independent public  accountants,  as indicated in
their report with  respect  thereto,  and  incorporated  by reference  herein in
reliance upon the authority of such firm as experts in giving said report.

     The financial statements of National Underground Storage,  Inc. for the two
years ended  December 31, 1997,  included in Iron  Mountain's  Current Report on
Form 8-K dated July 10, 1998 (as amended  August 7, 1998),  have been audited by
Carbis Walker & Associates, LLP, independent public accountants, as indicated 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 Midwest Records  Management for the year ended
December 31, 1997,  included in Iron Mountain's Current Report on Form 8-K dated
September 18, 1998, have been audited by Arthur Andersen LLP, independent public
accountants,  as  indicated  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.


                                       18

<PAGE>


     The financial  statements of Sloan Vaults,  Inc. and Affiliate for the year
ended December 31, 1997,  included in Iron Mountain's Current Report on Form 8-K
dated September 18, 1998, have been audited by Arthur Andersen LLP,  independent
public accountants,  as indicated 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 InterMation,  Inc. for the year ended December
31, 1997, included in Iron Mountain's Current Report on Form 8-K dated September
18,  1998,  have  been  audited  by  Arthur  Andersen  LLP,  independent  public
accountants,  as  indicated  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.






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