EXHIBIT 99.1

                              W. P. CAREY & CO. LLC

                    CERTIFICATION OF CHIEF EXECUTIVE OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of W. P. Carey & Co. LLC (the "Company") on
Form 10-K for the period ending  December 31, 2002 as filed with the  Securities
and Exchange  Commission  on the date hereof (the  "Report"),  we,  William Polk
Carey,  Co-Chief Executive Officer of the Company, and Gordon F. DuGan, Co-Chief
Executive  Officer of the Company,  certify,  to the best of our  knowledge  and
belief,  pursuant to 18 U.S.C.  ss. 1350, as adopted  pursuant to ss. 906 of the
Sarbanes-Oxley Act of 2002, that:

      (1)   The Report fully complies with the requirements of section 13(a) or
            15(d) of the Securities Exchange Act of 1934; and

      (2)   The information contained in the Report fairly presents, in all
            material respects, the financial condition and result of operations
            of the Company.


/s/       William Polk Carey              /s/      Gordon F. DuGan
          --------------------------               --------------------------

          William Polk Carey                       Gordon F. DuGan
          Chairman                                 President
          (Co-Chief Executive Officer)             (Co-Chief Executive Officer)
              3/25/2003                                3/25/2003
          --------------------------               ---------------------------
          Date                                     Date