Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Real estate investments:
Operating properties	$ 4,608,895	$ 4,669,289
Accumulated depreciation	(1,053,571)	(983,808)
Operating real estate investments, net	3,555,324	3,685,481
Construction-in-progress	140,456	74,174
Land inventory	90,842	93,351
Total real estate investments, net	3,786,622	3,853,006
Cash and cash equivalents	671,943	263,207
Accounts receivable, net	19,825	17,389
Accrued rent receivable, net	131,211	126,295
Assets held for sale	37,647	0
Investment in real estate ventures, at equity	197,539	180,512
Deferred costs, net	122,881	122,954
Intangible assets, net	105,300	132,329
Other assets	75,383	69,403
Total assets	5,148,351	4,765,095
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	658,601	670,151
Unsecured term loans	200,000	450,000
Unsecured senior notes, net of discounts	1,854,779	1,475,230
Accounts payable and accrued expenses	97,022	83,693
Distributions payable	28,857	25,584
Deferred income, gains and rent	53,219	71,635
Acquired lease intangibles, net	27,388	34,444
Other liabilities	36,824	32,923
Liabilities related to assets held for sale	1,771	0
Total liabilities	2,958,461	2,843,660
Commitments and contingencies (Note 16)
Equity:
6.90% Series E Preferred Shares/Units, $0.01 par value; issued and outstanding- 4,000,000 in 2014 and 2013	40	40
Common Shares of Brandywine Realty Trust’s beneficial interest, $0.01 par value; shares authorized 400,000,000; 178,982,369 and 156,731,993 issued and outstanding in 2014 and 2013, respectively	1,790	1,566
Additional paid-in capital	3,310,313	2,971,596
Deferred compensation payable in common shares	6,219	5,407
Common shares in grantor trust, 384,536 in 2014 and 312,280 in 2013	(6,219)	(5,407)
Cumulative earnings	531,294	522,528
Accumulated other comprehensive loss	(2,658)	(2,995)
Cumulative distributions	(1,671,888)	(1,592,515)
Total equity, excluding non-controlling interest	2,168,891	1,900,220
Non-controlling interests	20,999	21,215
Total beneficiaries' equity	2,189,890	1,921,435
Total liabilities and beneficiaries' equity	5,148,351	4,765,095
BRANDYWINE OPERATING PARTNERSHIP, L.P.
Real estate investments:
Operating properties	4,608,895	4,669,289
Accumulated depreciation	(1,053,571)	(983,808)
Operating real estate investments, net	3,555,324	3,685,481
Construction-in-progress	140,456	74,174
Land inventory	90,842	93,351
Total real estate investments, net	3,786,622	3,853,006
Cash and cash equivalents	671,943	263,207
Accounts receivable, net	19,825	17,389
Accrued rent receivable, net	131,211	126,295
Assets held for sale	37,647	0
Investment in real estate ventures, at equity	197,539	180,512
Deferred costs, net	122,881	122,954
Intangible assets, net	105,300	132,329
Other assets	75,383	69,403
Total assets	5,148,351	4,765,095
LIABILITIES AND BENEFICIARIES’ EQUITY
Mortgage notes payable	658,601	670,151
Unsecured term loans	200,000	450,000
Unsecured senior notes, net of discounts	1,854,779	1,475,230
Accounts payable and accrued expenses	97,022	83,693
Distributions payable	28,857	25,584
Deferred income, gains and rent	53,219	71,635
Acquired lease intangibles, net	27,388	34,444
Other liabilities	36,824	32,923
Liabilities related to assets held for sale	1,771	0
Total liabilities	2,958,461	2,843,660
Commitments and contingencies (Note 16)
Redeemable limited partnership units at redemption value;
Redeemable limited partnership units at redemption value; 1,721,905 and 1,763,739 issued and outstanding in 2014 and 2013, respectively	25,985	26,486
Equity:
6.90% Series E Preferred Shares/Units, $0.01 par value; issued and outstanding- 4,000,000 in 2014 and 2013	96,850	96,850
General Partnership Capital, 178,982,369 and 156,731,993 units issued and outstanding in 2014 and 2013, respectively	2,069,031	1,800,530
Accumulated other comprehensive loss	(3,042)	(3,377)
Total equity, excluding non-controlling interest	2,162,839	1,894,003
Non-controlling interests	1,066	946
Total beneficiaries' equity	2,163,905	1,894,949
Total liabilities and beneficiaries' equity	$ 5,148,351	$ 4,765,095