CONSOLIDATED STATEMENTS OF OPERATIONS - BRANDYWINE OPERATING PARTNERSHIP, L.P. - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Total revenue	$ 486,819	$ 534,852	$ 580,417
Operating expenses
Property operating expenses	121,890	132,172	154,361
Real estate taxes	53,621	63,032	62,237
Third party management expenses	12,800	10,252	9,248
Depreciation and amortization	178,105	188,283	210,005
General and administrative expenses	30,153	30,288	32,156
Total operating expenses	396,569	424,027	468,007
Gain on sale of real estate
Net gain on disposition of real estate	142	289,461	356
Net gain on sale of undepreciated real estate	2,903	201	2,020
Total gain on sale of real estate	3,045	289,662	2,376
Operating income	93,295	400,487	114,786
Other income (expense):
Interest and investment income	8,295	1,939	2,318
Interest expense	(62,617)	(73,911)	(81,512)
Interest expense - amortization of deferred financing costs	(2,836)	(2,904)	(2,768)
Equity in income (loss) of real estate venture	(26,697)	(18,584)	(9,922)
Net gain on real estate venture transactions	2,973	75	11,639
Net income before income taxes	12,413	307,102	34,541
Income tax (provision) benefit	(47)	224	(12)
Net income	12,366	307,326	34,529
Nonforfeitable dividends allocated to unvested restricted shareholders	(421)	(410)	(396)
Net income attributable to Common Shareholders/ Unitholders of Brandywine Realty Trust	$ 11,868	$ 305,117	$ 33,871
Basic income per Common Partnership Unit (in dollars per share)	$ 0.07	$ 1.77	$ 0.19
Diluted income per Common Partnership Unit (in dollars per share)	$ 0.07	$ 1.77	$ 0.19
Basic weighted average common partnership units outstanding (in shares)	170,878,185	171,926,079	176,132,941
Diluted weighted average common partnership units outstanding (in shares)	172,273,240	172,317,076	176,686,813
Rents
Revenue
Total revenue	$ 451,519	$ 513,504	$ 554,665
Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	26,444	18,580	19,626
Other
Revenue
Total revenue	8,856	2,768	6,126
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Total revenue	486,819	534,852	580,417
Operating expenses
Property operating expenses	121,890	132,172	154,361
Real estate taxes	53,621	63,032	62,237
Third party management expenses	12,800	10,252	9,248
Depreciation and amortization	178,105	188,283	210,005
General and administrative expenses	30,153	30,288	32,156
Total operating expenses	396,569	424,027	468,007
Gain on sale of real estate
Net gain on disposition of real estate	142	289,461	356
Net gain on sale of undepreciated real estate	2,903	201	2,020
Total gain on sale of real estate	3,045	289,662	2,376
Operating income	93,295	400,487	114,786
Other income (expense):
Interest and investment income	8,295	1,939	2,318
Interest expense	(62,617)	(73,911)	(81,512)
Interest expense - amortization of deferred financing costs	(2,836)	(2,904)	(2,768)
Equity in income (loss) of real estate venture	(26,697)	(18,584)	(9,922)
Net gain on real estate venture transactions	2,973	75	11,639
Net income before income taxes	12,413	307,102	34,541
Income tax (provision) benefit	(47)	224	(12)
Net income	12,366	307,326	34,529
Net (income) loss attributable to noncontrolling interests - consolidated real estate ventures	3	(20)	(69)
Net income attributable to Brandywine Operating Partnership	12,369	307,306	34,460
Nonforfeitable dividends allocated to unvested restricted shareholders	(421)	(410)	(396)
Net income attributable to Common Shareholders/ Unitholders of Brandywine Realty Trust	$ 11,948	$ 306,896	$ 34,064
Basic income per Common Partnership Unit (in dollars per share)	$ 0.07	$ 1.77	$ 0.19
Diluted income per Common Partnership Unit (in dollars per share)	$ 0.07	$ 1.77	$ 0.19
Basic weighted average common partnership units outstanding (in shares)	171,770,843	172,907,713	177,114,932
Diluted weighted average common partnership units outstanding (in shares)	173,165,898	173,298,710	177,668,804
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Rents
Revenue
Total revenue	$ 451,519	$ 513,504	$ 554,665
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Third party management fees, labor reimbursement and leasing
Revenue
Total revenue	26,444	18,580	19,626
BRANDYWINE OPERATING PARTNERSHIP, L.P. | Other
Revenue
Total revenue	$ 8,856	$ 2,768	$ 6,126