Exhibit 5.3




                 [LETTERHEAD OF RICHARDS, LAYTON & FINGER, P.A.]




                                December 13, 2001



IM Capital Trust I
c/o Iron Mountain Incorporated
745 Atlantic Avenue
Boston, Massachusetts  02111

                  Re:      IM Capital Trust I

Ladies and Gentlemen:

         We  have  acted  as  special   Delaware   counsel  for  Iron   Mountain
Incorporated,  a Pennsylvania corporation (the "Company"),  and IM Capital Trust
I, a Delaware  business trust (the "Trust"),  in connection with the matters set
forth herein. At your request, this opinion is being furnished to you.

         For  purposes  of  giving  the  opinions  hereinafter  set  forth,  our
examination  of documents  has been limited to the  examination  of originals or
copies of the following:

         (a) The  Certificate  of Trust of the Trust,  dated as of December  10,
2001 (the  "Certificate"),  as filed in the office of the  Secretary of State of
the State of Delaware (the "Secretary of State") on December 10, 2001;

         (b) The  Declaration  of Trust of the Trust,  dated as of December  10,
2001,  between  the  Company,  as sponsor,  and the  trustees of the Trust named
therein;

         (c) A form of Amended and  Restated  Declaration  of Trust of the Trust
(including  Exhibits A and B thereto)  (the  "Declaration"),  to be entered into
among the Company, as sponsor,  the trustees of the Trust named therein, and the
holders,  from time to time, of undivided  beneficial interests in the assets of
the Trust,  attached  as an exhibit to the  Registration  Statement  (as defined
below);

         (d)  The  Registration   Statement  on  Form  S-3  (the   "Registration
Statement"),  including a prospectus (the  "Prospectus"),  relating to the trust
preferred securities of the Trust






representing  undivided beneficial interests in the assets of the Trust (each, a
"Preferred Security" and collectively,  the "Preferred Securities"), as proposed
to be filed by the  Company  and the  Trust  with the  Securities  and  Exchange
Commission (the "SEC") on or about December 13, 2001; and

         (e) A Certificate  of Good Standing for the Trust,  dated  December 13,
2001, obtained from the Secretary of State.

         Capitalized  terms used  herein and not  otherwise  defined are used as
defined in the Declaration.

         For purposes of this opinion,  we have not reviewed any documents other
than the documents listed in paragraphs (a) through (e) above. In particular, we
have not reviewed any document  (other than the  documents  listed in paragraphs
(a) through (e) above) that is referred to in or  incorporated by reference into
the documents  reviewed by us. We have assumed that there exists no provision in
any document  that we have not reviewed that is  inconsistent  with the opinions
stated herein. We have conducted no independent factual investigation of our own
but rather have relied solely upon the foregoing  documents,  the statements and
information  set forth  therein and the  additional  matters  recited or assumed
herein,  all of which we have  assumed to be true,  complete and accurate in all
material respects.

         With respect to all  documents  examined by us, we have assumed (i) the
authenticity of all documents submitted to us as authentic  originals,  (ii) the
conformity  with the  originals  of all  documents  submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

         For purposes of this opinion,  we have assumed (i) that the Declaration
and the Certificate are in full force and effect and have not been amended, (ii)
except to the extent provided in paragraph 1 below,  that each of the parties to
the documents examined by us has been duly created,  organized or formed, as the
case may be,  and is validly  existing  in good  standing  under the laws of the
jurisdiction governing its creation,  organization or formation, (iii) the legal
capacity of natural  persons who are  parties to the  documents  examined by us,
(iv) that each of the parties to the documents  examined by us has the power and
authority to execute and deliver,  and to perform its  obligations  under,  such
documents, (v) that each of the parties to the documents examined by us has duly
authorized,  executed and  delivered  such  documents,  (vi) the receipt by each
Person to whom a Preferred Security is to be issued by the Trust  (collectively,
the "Preferred  Security Holders") of a Preferred Security  Certificate for such
Preferred Security and the payment for the Preferred Security acquired by it, in
accordance with the Declaration and the Registration  Statement,  and (vii) that
the Preferred  Securities are issued and sold to the Preferred  Security Holders
in accordance with the Declaration and the Registration  Statement.  We have not
participated  in the  preparation  of the  Registration  Statement and assume no
responsibility for its contents.






         This opinion is limited to the laws of the State of Delaware (excluding
the  securities  laws of the State of Delaware),  and we have not considered and
express no opinion on the laws of any other jurisdiction, including federal laws
and rules and regulations  relating thereto. Our opinions are rendered only with
respect to Delaware laws and rules,  regulations and orders  thereunder that are
currently in effect.

         Based upon the foregoing, and upon our examination of such questions of
law and  statutes of the State of Delaware as we have  considered  necessary  or
appropriate,  and subject to the  assumptions,  qualifications,  limitations and
exceptions set forth herein, we are of the opinion that:

         1. The Trust has been duly  created  and is  validly  existing  in good
standing as a business  trust  under the  Delaware  Business  Trust Act (12 Del.
C.ss.3801, et seq.).

         2. The Preferred  Securities will represent  valid and,  subject to the
qualifications  set forth in  paragraph  3 below,  fully paid and  nonassessable
undivided beneficial interests in the assets of the Trust.

         3. The Preferred  Security Holders,  as beneficial owners of the Trust,
will be  entitled  to the same  limitation  of  personal  liability  extended to
stockholders  of private  corporations  for profit  organized  under the General
Corporation  Law of the State of Delaware.  We note that the Preferred  Security
Holders may be obligated to make payments as set forth in the Declaration.

         We consent to the filing of this  opinion with the SEC as an exhibit to
the  Registration  Statement.  In addition,  we hereby consent to the use of our
name under the heading  "Validity of the Offered  Securities" in the Prospectus.
In giving the  foregoing  consents,  we do not thereby admit that we come within
the  category  of Persons  whose  consent  is  required  under  Section 7 of the
Securities  Act of 1933,  as amended,  or the rules and  regulations  of the SEC
thereunder.  Except as stated  above,  without our prior written  consent,  this
opinion may not be  furnished  or quoted to, or relied upon by, any other Person
for any purpose.

                                      Very truly yours,


                                      /s/ Richards, Layton & Finger, P.A.
BJK/ENF