Exhibit 31.2


                     RULE 13a-14(a)/15d-14(a) CERTIFICATION

I, John Reyes, certify that:

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

2.     Based on my  knowledge,  this  annual  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 annual
       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; and

       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:

       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, Corporate General Partner
Date:  March 26, 2008