Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Real estate investments:
Operating properties	$ 3,437,074	$ 3,474,109
Accumulated depreciation	(957,793)	(896,561)
Right of use asset - operating leases, net	20,478	20,977
Operating real estate investments, net	2,499,759	2,598,525
Construction-in-progress	266,263	210,311
Land held for development	118,684	117,984
Prepaid leasehold interests in land held for development, net	27,762	39,185
Total real estate investments, net	2,912,468	2,966,005
Assets held for sale, net	562	7,349
Cash and cash equivalents	42,484	46,344
Accounts receivable	11,645	13,536
Accrued rent receivable, net of allowance of $4,133 and $5,086 as of September 30, 2021 and December 31, 2020, respectively	165,564	155,372
Investment in unconsolidated real estate ventures	449,658	401,327
Deferred costs, net	81,632	84,856
Intangible assets, net	34,514	48,570
Other assets	131,230	176,747
Total assets	3,829,757	3,900,106
LIABILITIES AND EQUITY
Unsecured term loan, net	249,477	249,084
Unsecured senior notes, net	1,581,112	1,581,511
Accounts payable and accrued expenses	133,615	121,982
Distributions payable	32,763	32,706
Deferred income, gains and rent	21,861	21,396
Intangible liabilities, net	14,451	18,448
Lease liability - operating leases	22,911	22,758
Other liabilities	48,090	47,573
Total liabilities	2,104,280	2,095,458
Commitments and contingencies (See Note 15)
Equity:
Common Shares of Brandywine Realty Trust's beneficial interest, $0.01 par value; shares authorized 400,000,000; 171,126,257 and 170,572,964 issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	1,712	1,707
Additional paid-in-capital	3,145,209	3,138,152
Deferred compensation payable in common shares	18,491	17,516
Common shares in grantor trust, 1,169,703 and 1,160,494 issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	(18,491)	(17,516)
Cumulative earnings	1,117,804	1,110,083
Accumulated other comprehensive loss	(4,333)	(7,561)
Cumulative distributions	(2,545,979)	(2,448,238)
Total Brandywine Realty Trust's equity	1,714,413	1,794,143
Noncontrolling interests	11,064	10,505
Total beneficiaries' equity	1,725,477	1,804,648
Total liabilities and beneficiaries' equity	3,829,757	3,900,106
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	3,437,074	3,474,109
Accumulated depreciation	(957,793)	(896,561)
Right of use asset - operating leases, net	20,478	20,977
Operating real estate investments, net	2,499,759	2,598,525
Construction-in-progress	266,263	210,311
Land held for development	118,684	117,984
Prepaid leasehold interests in land held for development, net	27,762	39,185
Total real estate investments, net	2,912,468	2,966,005
Assets held for sale, net	562	7,349
Cash and cash equivalents	42,484	46,344
Accounts receivable	11,645	13,536
Accrued rent receivable, net of allowance of $4,133 and $5,086 as of September 30, 2021 and December 31, 2020, respectively	165,564	155,372
Investment in unconsolidated real estate ventures	449,658	401,327
Deferred costs, net	81,632	84,856
Intangible assets, net	34,514	48,570
Other assets	131,230	176,747
Total assets	3,829,757	3,900,106
LIABILITIES AND EQUITY
Unsecured term loan, net	249,477	249,084
Unsecured senior notes, net	1,581,112	1,581,511
Accounts payable and accrued expenses	133,615	121,982
Distributions payable	32,763	32,706
Deferred income, gains and rent	21,861	21,396
Intangible liabilities, net	14,451	18,448
Lease liability - operating leases	22,911	22,758
Other liabilities	48,090	47,573
Total liabilities	2,104,280	2,095,458
Commitments and contingencies (See Note 15)
Redeemable limited partnership units at redemption value; 823,983 and 981,634 issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	11,170	11,566
Equity:
General Partnership Capital; 171,126,257 and 170,572,964 units issued and outstanding as of September 30, 2021 and December 31, 2020, respectively	1,718,929	1,800,945
Accumulated other comprehensive loss	(4,690)	(7,935)
Total Brandywine Operating Partnership, L.P.'s equity	1,714,239	1,793,010
Noncontrolling interest - consolidated real estate ventures	68	72
Total partners' equity	1,714,307	1,793,082
Total liabilities and beneficiaries' equity	$ 3,829,757	$ 3,900,106