Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue:
Rents	$ 459,855	$ 462,771	$ 443,485
Tenant reimbursements	78,613	79,108	75,330
Termination fees	3,233	2,951	5,516
Third party management fees, labor reimbursement and leasing	12,116	11,536	11,830
Other	6,016	5,387	4,271
Total revenue	559,833	561,753	540,432
Operating Expenses:
Property operating expenses	159,296	167,077	163,294
Real estate taxes	55,969	54,171	51,927
Third party management expenses	5,127	5,590	5,866
Depreciation and amortization	195,841	210,334	203,345
General and administrative expenses	25,413	24,602	23,306
Total operating expenses	441,646	461,774	447,738
Operating income	118,187	99,979	92,694
Other Income (Expense):
Investment Income, Interest	3,012	1,813	3,218
Historic tax credit transaction income	11,840	12,026	0
Interest expense	(132,939)	(131,405)	(132,640)
Interest expense - amortization of deferred financing costs	(6,208)	(4,991)	(3,770)
Interest expense — financing obligation	(850)	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(2,985)	0	0
Equity in income of real estate ventures	2,741	3,775	5,305
Net gain on sales of interests in real estate ventures	0	2,791	(22)
Net gain on sale of undepreciated real estate	0	45	0
Loss on real estate venture formation	(950)	(222)	0
Gain (loss) on early extinguishment of debt	(22,002)	(2,776)	(2,110)
Income (loss) from continuing operations	(30,154)	(18,965)	(37,325)
Discontinued operations:
Income from discontinued operations	1,909	6,986	8,739
Net gain (loss) on disposition of discontinued operations	34,774	7,264	10,980
Total discontinued operations	36,683	14,250	19,719
Net income (loss)	6,529	(4,715)	(17,606)
Net income from discontinued operations attributable to non-controlling interests - LP units	(670)	(553)	(414)
Net (income) loss attributable to non-controlling interests - LP units	736	769	946
Net (income) loss attributable to non-controlling interests	66	216	532
Net income (loss) attributable to Brandywine Realty Trust	6,595	(4,499)	(17,074)
Distribution to Preferred Shares	(10,405)	(7,992)	(7,992)
Preferred share redemption charge	(4,052)	0	0
Amount allocated to unvested restricted shareholders	(376)	(505)	(512)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	(8,238)	(12,996)	(25,578)
Basic income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.31)	$ (0.20)	$ (0.34)
Discontinued operations (in dollars per share)	$ 0.25	$ 0.10	$ 0.15
Basic income (loss) per Common Share (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.19)
Diluted income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.31)	$ (0.20)	$ (0.34)
Discontinued operations (in dollars per share)	$ 0.25	$ 0.10	$ 0.15
Diluted income (loss) per Common Share (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.19)
Basic weighted average shares outstanding (in shares)	143,257,097	135,444,424	131,743,275
Diluted weighted average shares outstanding (in shares)	143,257,097	135,444,424	131,743,275
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	(29,418)	(18,196)	(36,379)
Income (loss) from discontinued operations	36,013	13,697	19,305
Net income (loss)	6,595	(4,499)	(17,074)
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Revenue:
Rents	459,855	462,771	443,485
Tenant reimbursements	78,613	79,108	75,330
Termination fees	3,233	2,951	5,516
Third party management fees, labor reimbursement and leasing	12,116	11,536	11,830
Other	6,016	5,387	4,271
Total revenue	559,833	561,753	540,432
Operating Expenses:
Property operating expenses	159,296	167,077	163,294
Real estate taxes	55,969	54,171	51,927
Third party management expenses	5,127	5,590	5,866
Depreciation and amortization	195,841	210,334	203,345
General and administrative expenses	25,413	24,602	23,306
Total operating expenses	441,646	461,774	447,738
Operating income	118,187	99,979	92,694
Other Income (Expense):
Investment Income, Interest	3,012	1,813	3,218
Historic tax credit transaction income	11,840	12,026	0
Interest expense	(132,939)	(131,405)	(132,640)
Interest expense - amortization of deferred financing costs	(6,208)	(4,991)	(3,770)
Interest expense — financing obligation	(850)	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(2,985)	0	0
Equity in income of real estate ventures	2,741	3,775	5,305
Net gain on sales of interests in real estate ventures	0	2,791	(22)
Net gain on sale of undepreciated real estate	0	45
Loss on real estate venture formation	(950)	(222)	0
Gain (loss) on early extinguishment of debt	(22,002)	(2,776)	(2,110)
Income (loss) from continuing operations	(30,154)	(18,965)	(37,325)
Discontinued operations:
Income from discontinued operations	1,909	6,986	8,739
Net gain (loss) on disposition of discontinued operations	34,774	7,264	10,980
Total discontinued operations	36,683	14,250	19,719
Net income (loss)	6,529	(4,715)	(17,606)
Net income (loss) attributable to Brandywine Realty Trust	6,529	(4,715)	(17,606)
Distribution to Preferred Shares	(10,405)	(7,992)	(7,992)
Preferred share redemption charge	(4,052)	0	0
Amount allocated to unvested restricted shareholders	(376)	(505)	(512)
Net income (loss) attributable to Common Shareholders of Brandywine Realty Trust	(8,304)	(13,212)	(26,110)
Basic income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.31)	$ (0.19)	$ (0.33)
Discontinued operations (in dollars per share)	$ 0.25	$ 0.10	$ 0.14
Basic income (loss) per Common Share (in dollars per share)	$ (0.06)	$ (0.09)	$ (0.19)
Diluted income (loss) per Common Share:
Continuing operations (in dollars per share)	$ (0.31)	$ (0.19)	$ (0.33)
Discontinued operations (in dollars per share)	$ 0.25	$ 0.10	$ 0.14
Diluted income (loss) per Common Share (in dollars per share)	$ (0.06)	$ (0.09)	$ (0.19)
Basic weighted average shares outstanding (in shares)	145,883,217	145,118,841	137,454,796
Diluted weighted average shares outstanding (in shares)	145,883,217	145,118,841	137,454,796
Net income (loss) attributable to Brandywine Realty Trust
Income (loss) from continuing operations	(30,154)	(18,965)	(37,325)
Income (loss) from discontinued operations	36,683	14,250	19,719
Net income (loss)	$ 6,529	$ (4,715)	$ (17,606)