EXHIBIT 31

                    CERTIFICATION PURSUANT TO RULE 13a-14(a),
                       AS ADOPTED PURSUANT TO SECTION 302
                        OF THE SARBANES-OXLEY ACT OF 2002

I, Joseph M. Jayson, Individual General Partner and Principal Financial Officer
of Realmark Property Investors Limited Partnership - III, hereby certify that:

     1.  I have reviewed this quarterly report on Form 10-Q for the period ended
         March 31, 2006 of Realmark Property Investors Limited Partnership -
         III;

     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 quarterly report;

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

     4.  I am responsible for establishing and maintaining disclosure controls
         and procedures (as defined in Exchange Act Rules 13a-15(e) and
         15d-15(e)) and internal control over financial reporting (as defined in
         Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Partnership and I
         have:

         a.   Designed such disclosure controls and procedures, or caused such
              disclosure controls and procedures to be designed under my
              supervision, to ensure the material information relating to the
              Partnership, including its consolidated subsidiary, is made known
              to me by others within the Partnership, particularly during the
              period in which this quarterly report is being prepared;

         b.   Designed such internal control over financial reporting, or caused
              such internal control over financial reporting to be designed
              under my supervision, to provide reasonable assurance regarding
              the reliability of financial reporting and the preparation of
              financial statements for external purposes in accordance with
              generally accepted accounting principles;

         c.   Evaluated the effectiveness of the Partnership'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 Partnership's internal
              control over financial reporting that occurred during the
              Partnership's most recent fiscal quarter that has materially
              affected, or is reasonably likely to materially affect, the
              Partnership's internal control over financial reporting; and

     5.  I have disclosed, based on my most recent evaluation of internal
         control over financial reporting, to the Partnership's auditors and the
         audit committee of the board of directors (or persons performing the
         equivalent function):
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         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 Partnership'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 Partnership's
              internal control over financial reporting.

              May 15, 2006                      /s/ Joseph M. Jayson
              ------------                      --------------------
                   Date                         Joseph M. Jayson,
                                                Individual General Partner and
                                                Principal Financial Officer