Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Real estate investments:
Operating properties	$ 3,386,559	$ 3,474,109
Accumulated depreciation	(900,167)	(896,561)
Right of use asset - operating leases, net	20,810	20,977
Operating real estate investments, net	2,507,202	2,598,525
Construction-in-progress	264,529	210,311
Land held for development	116,902	117,984
Prepaid leasehold interests in land held for development, net	27,762	39,185
Total real estate investments, net	2,916,395	2,966,005
Assets held for sale, net	7,349	7,349
Cash and cash equivalents	45,717	46,344
Accounts receivable	14,665	13,536
Accrued rent receivable, net of allowance of $5,080 and $5,086 as of March 31, 2021 and December 31, 2020, respectively	159,175	155,372
Investment in Real Estate Ventures	433,046	401,327
Deferred costs, net	83,839	84,856
Intangible assets, net	43,883	48,570
Other assets	185,844	176,747
Total assets	3,889,913	3,900,106
LIABILITIES AND EQUITY
Unsecured credit facility	13,000	0
Unsecured term loan, net	249,215	249,084
Unsecured senior notes, net	1,581,378	1,581,511
Accounts payable and accrued expenses	119,208	121,982
Distributions payable	32,763	32,706
Deferred income, gains and rent	22,416	21,396
Intangible liabilities, net	17,073	18,448
Lease liability - operating leases	22,810	22,758
Other liabilities	49,796	47,573
Total liabilities	2,107,659	2,095,458
Commitments and contingencies (See Note 14)
Equity:
Common Shares of Brandywine Realty Trust's beneficial interest, $0.01 par value; shares authorized 400,000,000; 170,663,251 and 170,572,964 issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	1,707	1,707
Additional paid-in-capital	3,140,456	3,138,152
Deferred compensation payable in common shares	17,658	17,516
Common shares in grantor trust, 1,111,777 and 1,160,494 issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	(17,658)	(17,516)
Cumulative earnings	1,117,004	1,110,083
Accumulated other comprehensive loss	(6,469)	(7,561)
Cumulative distributions	(2,480,811)	(2,448,238)
Total Brandywine Realty Trust's equity	1,771,887	1,794,143
Noncontrolling interests	10,367	10,505
Total beneficiaries' equity	1,782,254	1,804,648
Total liabilities and beneficiaries' equity	3,889,913	3,900,106
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	3,386,559	3,474,109
Accumulated depreciation	(900,167)	(896,561)
Right of use asset - operating leases, net	20,810	20,977
Operating real estate investments, net	2,507,202	2,598,525
Construction-in-progress	264,529	210,311
Land held for development	116,902	117,984
Prepaid leasehold interests in land held for development, net	27,762	39,185
Total real estate investments, net	2,916,395	2,966,005
Assets held for sale, net	7,349	7,349
Cash and cash equivalents	45,717	46,344
Accounts receivable	14,665	13,536
Accrued rent receivable, net of allowance of $5,080 and $5,086 as of March 31, 2021 and December 31, 2020, respectively	159,175	155,372
Investment in Real Estate Ventures	433,046	401,327
Deferred costs, net	83,839	84,856
Intangible assets, net	43,883	48,570
Other assets	185,844	176,747
Total assets	3,889,913	3,900,106
LIABILITIES AND EQUITY
Unsecured credit facility	13,000	0
Unsecured term loan, net	249,215	249,084
Unsecured senior notes, net	1,581,378	1,581,511
Accounts payable and accrued expenses	119,208	121,982
Distributions payable	32,763	32,706
Deferred income, gains and rent	22,416	21,396
Intangible liabilities, net	17,073	18,448
Lease liability - operating leases	22,810	22,758
Other liabilities	49,796	47,573
Total liabilities	2,107,659	2,095,458
Commitments and contingencies (See Note 14)
Redeemable limited partnership units at redemption value; 981,634 issued and outstanding as of March 31, 2021 and December 31, 2020	12,673	11,566
Equity:
General Partnership Capital; 170,663,251 and 170,572,964 units issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	1,776,347	1,800,945
Accumulated other comprehensive loss	(6,837)	(7,935)
Total Brandywine Operating Partnership, L.P.'s equity	1,769,510	1,793,010
Noncontrolling interest - consolidated real estate ventures	71	72
Total partners' equity	1,769,581	1,793,082
Total liabilities and beneficiaries' equity	$ 3,889,913	$ 3,900,106