Exhibit 31.2


                            CERTIFICATION PURSUANT TO
            RULE 13a-14(a) or 15d-14(a) OF THE SECURITIES EXCHANGE ACT OF 1934,
                             AS ADOPTED PURSUANT TO
                  SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John Reyes certify that:

1.   I have  reviewed  this  quarterly  report on Form  10-Q of Public  Storage
     Properties IV, Ltd.;

2.   Based on my knowledge,  this quarterly  report does not contain any untrue
     statement of a material fact or omit to state a material fact necessary to
     make the statements made, in light of the  circumstances  under which such
     statements were made, not misleading with respect to the period covered by
     this report;

3.   Based on my  knowledge,  the  financial  statements,  and other  financial
     information  included  in this  report,  fairly  present  in all  material
     respects the financial condition,  results of operations and cash flows of
     the registrant as of, and for, the periods presented in this report;

4.   The  registrant's  other  certifying  officer  and I are  responsible  for
     establishing  and  maintaining  disclosure  controls  and  procedures  (as
     defined in Exchange Act Rules  13a-15(e) and 15d-15(e)) for the registrant
     and we have:

     a)  designed such disclosure controls and procedures, or caused such
         disclosure controls and procedures to be designed under our
         supervision, to ensure that material information relating to the
         registrant, including its consolidated subsidiaries, is made known to
         us by others within those entities, particularly during the period in
         which this report is being prepared;

     b)  [paragraph omitted pursuant to SEC Release Nos. 33-8238 and 34-47986]

     c)  evaluated the effectiveness of the registrant's disclosure controls and
         procedures and presented in this report conclusions about the
         effectiveness of the disclosure controls and procedures as of the end
         of the period covered by this report based on such evaluation;

     d)  disclosed in this report any change in the registrant's internal
         control over financial reporting that occurred the registrant's most
         recent fiscal quarter (the registrant's fourth fiscal quarter in the
         case of an annual report) that has materially affected, or is
         reasonably likely to materially affect, the registrant's internal
         control over financial reporting; and

5.   The registrant's other certifying  officer and I have disclosed,  based on
     our most recent  evaluation of internal control over financial  reporting,
     to the registrant's auditors and the audit committee of registrant's board
     of directors (or person performing the equivalent functions):

a)       all significant deficiencies and material weaknesses in the design or
         operation of internal control over financial reporting which are
         reasonably likely to adversely affect the registrant's ability to
         record, process, summarize and report financial information; and

b)       any fraud, whether or not material, that involves management or other
         employees who have a significant role in the registrant's internal
         control over financial reporting.

/s/  John Reyes
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Name:  John Reyes
Title: Chief Financial Officer of Public Storage, Inc.,
       Corporate General Partner
Date:  May 16, 2005