Exhibit 31.2


                                  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  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 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  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

         d)   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 (or persons performing the equivalent functions):

         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
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Name:    John Reyes
Title:   Chief Financial Officer of Public Storage,
         Corporate General Partner
Date:    March 25, 2009