Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue
Revenue	$ 120,102	$ 136,837	$ 240,871	$ 281,925
Operating expenses
Property operating expenses	29,264	33,292	58,199	70,753
Real estate taxes	14,602	16,815	29,363	33,602
Third party management expenses	3,561	2,375	6,539	5,037
Depreciation and amortization	42,785	49,743	83,128	101,781
General and administrative expenses	8,356	8,343	14,940	16,904
Total operating expenses	98,568	110,568	192,169	228,077
Gain on sale of real estate
Net gain on disposition of real estate	68	0	142	2,586
Net gain on sale of undepreciated real estate	0	201	1,993	201
Total gain on sale of real estate	68	201	2,135	2,787
Operating income	21,602	26,470	50,837	56,635
Other income (expense):
Interest and investment income	1,677	445	3,351	1,020
Interest expense	(15,490)	(20,191)	(31,783)	(40,200)
Interest expense - amortization of deferred financing costs	(709)	(731)	(1,418)	(1,480)
Equity in loss of unconsolidated real estate ventures	(7,240)	(2,203)	(14,164)	(4,094)
Net income (loss) before income taxes	(160)	3,790	6,823	11,881
Income tax (provision) benefit	(15)	230	(34)	226
Net income (loss)	(175)	4,020	6,789	12,107
Net (income) loss attributable to noncontrolling interests	8	(24)	(35)	(89)
Net income (loss) attributable to Brandywine Realty Trust	(167)	3,996	6,754	12,018
Nonforfeitable dividends allocated to unvested restricted shareholders	(94)	(93)	(240)	(224)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (261)	$ 3,903	$ 6,514	$ 11,794
Basic income per Common Share (in dollars per share)	$ 0	$ 0.02	$ 0.04	$ 0.07
Diluted income per Common Share (in dollars per share)	$ 0	$ 0.02	$ 0.04	$ 0.07
Basic weighted average shares outstanding (in shares)	170,848,894	170,518,095	170,737,437	173,294,031
Diluted weighted average shares outstanding (in shares)	170,848,894	170,770,078	171,996,119	173,605,948
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Revenue	$ 120,102	$ 136,837	$ 240,871	$ 281,925
Operating expenses
Property operating expenses	29,264	33,292	58,199	70,753
Real estate taxes	14,602	16,815	29,363	33,602
Third party management expenses	3,561	2,375	6,539	5,037
Depreciation and amortization	42,785	49,743	83,128	101,781
General and administrative expenses	8,356	8,343	14,940	16,904
Total operating expenses	98,568	110,568	192,169	228,077
Gain on sale of real estate
Net gain on disposition of real estate	68	0	142	2,586
Net gain on sale of undepreciated real estate	0	201	1,993	201
Total gain on sale of real estate	68	201	2,135	2,787
Operating income	21,602	26,470	50,837	56,635
Other income (expense):
Interest and investment income	1,677	445	3,351	1,020
Interest expense	(15,490)	(20,191)	(31,783)	(40,200)
Interest expense - amortization of deferred financing costs	(709)	(731)	(1,418)	(1,480)
Equity in loss of unconsolidated real estate ventures	(7,240)	(2,203)	(14,164)	(4,094)
Net income (loss) before income taxes	(160)	3,790	6,823	11,881
Income tax (provision) benefit	(15)	230	(34)	226
Net income (loss)	(175)	4,020	6,789	12,107
Net (income) loss attributable to noncontrolling interests - consolidated real estate ventures	1	(10)	2	(22)
Net income (loss) attributable to Brandywine Operating Partnership	(174)	4,010	6,791	12,085
Nonforfeitable dividends allocated to unvested restricted shareholders	(94)	(93)	(240)	(224)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	$ (268)	$ 3,917	$ 6,551	$ 11,861
Basic income per Common Share (in dollars per share)	$ 0	$ 0.02	$ 0.04	$ 0.07
Diluted income per Common Share (in dollars per share)	$ 0	$ 0.02	$ 0.04	$ 0.07
Basic weighted average shares outstanding (in shares)	171,792,415	171,499,729	171,699,909	174,275,665
Diluted weighted average shares outstanding (in shares)	171,792,415	171,751,712	172,958,591	174,587,582
Rents
Revenue
Revenue	$ 111,235	$ 132,180	$ 224,719	$ 271,384
Rents | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Revenue	111,235	132,180	224,719	271,384
Third party management fees, labor reimbursement and leasing
Revenue
Revenue	6,627	4,061	13,278	9,015
Third party management fees, labor reimbursement and leasing | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Revenue	6,627	4,061	13,278	9,015
Other
Revenue
Revenue	2,240	596	2,874	1,526
Other | BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue
Revenue	$ 2,240	$ 596	$ 2,874	$ 1,526