EXHIBIT 23.3 CONSENT OF INDEPENDENT ACCOUNTANTS We consent to the incorporation by reference in this Proxy Statement of our report dated May 20, 1998 on our audits of the combined statement of revenues and certain expenses of the Airport Square Acquisition Properties. We also consent to the reference to our firm under the caption "EXPERTS." /s/ PRICEWATERHOUSECOOPERS LLP Philadelphia, PA July 20, 1998