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                                                                    EXHIBIT 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent public accountants, we hereby consent to the incorporation by
reference of our report dated June 15, 2000 on the combined statement of revenue
and certain expenses of the Reckson Morris Industrial Portfolio - Phase II and
Phase III as of December 31, 1999, included in this Form 8-K/A, into the
Company's previously filed: Form S-3 Registration Statements File Nos.
333-58971, 333-59251, 333-67637, 333-74277, 333-77627, 333-89095, 333-92741,
333-31504 and Form S-8 Registration Statement File No. 333-70529.

                                               /s/ Arthur Andersen LLP

Philadelphia, Pa.
    July 17, 2000



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