
<PAGE>




                                                                    Exhibit 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

     As independent public accountants, we hereby consent to the incorporation

by reference in this Amendment No. 1 to the Registration Statement on Form S-3
(the "Registration Statement") of Brandywine Realty Trust (the "Company") and
Brandywine Operating Partnership, L.P. (the "Operating Partnership") of: our
report dated June 3, 1998 on the consolidated financial statements of the
Operating Partnership for the period August 22, 1996 to December 31, 1996 and
for the year ended December 31, 1997 and on the consolidated financial
statement's of the Company for the period January 1, 1996 to August 21, 1996 and
for the year ended December 31, 1995, included in the Operating Partnership's
Registration Statement on Form 10, initially filed on June 5, 1998, as amended;
our report dated March 4, 1998, on the consolidated financial statements of the
Company, included in the Company's Annual Report on Form 10-K for the year ended
December 31, 1997; our report dated February 11, 1997 on the combined financial
statements of revenue and certain expenses of Columbia Acquisition Properties
for the year ended December 31, 1996, included in the Company's Form 8-K/A
(No.1) dated February 13, 1997 and Form 8-K/A (No. 2) dated February 24, 1997;
our report dated January 29, 1997 on the combined financial statements of
revenue and certain expenses of Main Street Properties for the year ended
December 31, 1996, included in the Company's Form 8-K/A (No. 1) dated April 29,
1997; our report dated May 29, 1997 on the combined financial statements of
revenue and certain expenses of TA Properties for the year ended December 31,
1996, included in the Company's Form 8-K dated June 9, 1997; our report dated
June 3, 1997 on the combined financial statements of revenue and certain
expenses of Emmes Properties for the year ended December 31, 1996, included in
the Company's Form 8-K dated June 9, 1997; our report dated June 23, 1997 on the
combined financial statements of revenue and certain expenses of 748 & 855
Springdale Drive for the year ended December 31, 1996 included in the Company's
Form 8-K dated June 26, 1997; our report dated July 21, 1997 on the combined
financial statements of revenue and certain expenses of the Green Hills
Properties for the year ended December 31, 1996 included in the Company's Form
10-Q for the quarter ended June 30, 1997; our report dated July 21, 1997 on the
combined financial statements of revenue and certain expenses of the Berwyn Park
Properties for the year ended December 31, 1996, included in the Company's Form
10-Q for the quarter ended June 30, 1997; our report dated August 21, 1997 on
the combined financial statements of revenue and certain expenses of 500 & 501
Office Center Drive for the year ended December 31, 1996 included in the
Company's Form 8-K dated September 10, 1997; our report dated October 15, 1997
on the combined financial statements of revenue and certain expenses of
Metropolitan Industrial Center for the year ended December 31, 1996, included in
the Company's Form 8-K dated October 30, 1997; our report dated October 27, 1997
on the combined financial statements of revenue and certain expenses of Atrium I
for the year ended December 31, 1996, included in the Company's Form 8-K dated
October 30, 1997; our report dated November 14, 1997 on the combined financial
statements of revenue and certain expenses of Scarborough Properties for the
year ended December 31, 1996, included in the Company's Form 8-K dated December
17, 1997; our report dated December 3, 1997 on the financial statement of
revenue and certain expenses of Bala Pointe Office Centre for the year ended
December 15, 1996, included in the Company's Form 8-K dated December 17, 1997;
and our report dated December 13, 1997 on the combined financial statements of
revenue and certain expenses of GMH Properties for the year ended December 31,
1996, included in the Company's Form 8-K dated December 17, 1997; our report
dated January 22, 1998 on the combined financial statement of revenue and
certain expenses of the RREEF Properties for the year ended December 31, 1996,
included in the Company's Form 8-K dated January 27, 1998; our report dated
January 23, 1998 on the financial statement of revenue and certain expenses of
Three Christina Centre for the year ended December 31, 1996, included in the
Company's Form 8-K dated February 23, 1998; our report dated March 24, 1998 on
the financial statement of revenue and certain expenses of Three Christina
Centre for the year ended December 31, 1997, included in the Company's Form 8-K
dated April 16, 1998; our report dated April 15, 1998 on the combined financial
statements of revenue and certain expenses of DKM Properties for the year ended
December 31, 1997, included in the Company's Form 8-K/A dated April 16, 1998;
our report dated April 27, 1998 on the combined financial statements of revenue
and certain expenses of First Commercial Properties for the year ended December
31, 1997, included in the Company's Form 8-K dated May 14, 1998; our report
dated May 1, 1998 on the financial statement of revenue and certain expenses of
One Christina Centre for the year ended December 31, 1997, included in the
Company's Form 8-K dated May 14, 1998;



<PAGE>



and to all references to our Firm included in the Registration Statement.

                                            /s/  ARTHUR ANDERSEN LLP
                                                 ----------------------
                                                 Arthur Andersen LLP

Philadelphia, Pennsylvania
July 16, 1998
