Exhibit 23 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our report dated April 12, 2002 included in this Form 8-K/A No. 1 dated April 4, 2002 on the statement of revenue and certain expenses of Beaver Valley Mall into the Registrant's previously filed Registration Statements on Forms S-3 (File No. 33-61115, File No. 333-48917, File No. 333-70157, as amended, File No. 333-74693, File No. 333-74695, File No. 333-74697, File No. 333-36626) and Forms S-8 (File No. 33-59771, File No. 33-59773, File No. 33-59767 and File No. 333-69877). /s/ ARTHUR ANDERSEN LLP Philadelphia, Pennsylvania April 30, 2002