Exhibit 31.2

                    CERTIFICATION OF CEO AND CFO PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002


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 year-end report;

3.   Based on my  knowledge,  the  financial  statements,  and  other  financial
     information  included  in  this  year-end  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  officers  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 year-end report is being prepared;

     b)  evaluated the effectiveness of the registrant's disclosure controls and
         procedures  and  presented  in this  report our  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

     c)  disclosed  in this  report  any  change  in the  registrant's  internal
         control over financial  reporting that occurred during 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  officers and I have disclosed,  based on
     our most recent evaluation of internal  controls 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  controls  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
         controls over financial reporting.


/s/  John Reyes
-------------------
Name:    John Reyes
Title:   Chief Financial Officer of Public Storage, Inc.
         Corporate General Partner
Date:    March 30, 2007